CN115750103B - Anti-surge control method and device, electronic equipment and storage medium - Google Patents
Anti-surge control method and device, electronic equipment and storage medium Download PDFInfo
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Abstract
The application discloses an anti-surge control method and device, electronic equipment and a storage medium, and relates to the technical field of control. In the application, during the closing process of the ETV, the pressure sensor is used for determining the actual pressure ratio of the air compressor at the current measurement moment, and then the target pressure ratio interval to which the actual pressure ratio belongs is determined based on the candidate pressure ratio interval set corresponding to the current folded flow of the air compressor, so that the ETV is controlled based on the ETV control mode set corresponding to the target pressure ratio interval. By adopting the mode, the technical defects that in the prior art, the judgment basis for controlling ETV closing is simpler only according to whether the closing degree of the ETV reaches a preset threshold value and the accurate judgment is not directly carried out according to the factor triggering the surge phenomenon are avoided, so that the accuracy of the anti-surge control of the air compressor is improved.
Description
Technical Field
The present application relates to the field of control technologies, and in particular, to an anti-surge control method, an anti-surge control device, an electronic device, and a storage medium.
Background
The turbocharger is a mechanical structure commonly adopted in the field of automobiles at present, and utilizes the energy of exhaust gas discharged by an engine to drive an exhaust gas turbine, so that the turbine is utilized to drive a coaxial compressor to apply work to air, and compressed air is sent into a gasoline engine cylinder.
However, when the working condition of the compressor in the turbocharger is changed, a surge phenomenon is easy to occur, for example, when the accelerator is suddenly lost after acceleration (i.e. the accelerator is released) and the speed is reduced, the engine can run from a large load area to a small load area, the electronically controlled throttle valve (Electronic Throttle Valve, ETV) can be suddenly closed from the small closing degree to the large closing degree, so that the large air inlet pressure in the air inlet pipeline is blocked by the ETV, the circulation rate is greatly reduced, the air inlet pressure flow is changed, even the air flows back to the compressor, the outlet pressure of the compressor is fluctuated, and the surge phenomenon is caused, therefore, the surge phenomenon can cause the engine to generate strong mechanical vibration and hot end overtemperature, and serious damage is caused to the engine in a short time.
In the prior art, in order to prevent the surge phenomenon of the compressor as much as possible, the electronic control unit is generally used for acquiring the opening degree information of the ETV, and then judging whether the acquired ETV starts to be closed or not; if yes, judging whether the closing degree of the ETV reaches a preset threshold value, and controlling the ETV to close according to a first running speed when the closing degree of the ETV does not reach the preset threshold value, wherein the first running speed is the normal closing speed of the ETV; similarly, when the closing degree of the ETV reaches a preset threshold value, the ETV is controlled to be closed according to a second running speed, wherein the second running speed is the closing speed of the ETV according to the preset speed; finally, the ETV is controlled to close to the target position.
Therefore, by adopting the anti-surge control method, the judgment basis for controlling the closing of the ETV by adopting the first running speed or the second running speed is simpler only according to whether the closing degree of the ETV reaches the preset threshold value, and the accurate judgment is not directly carried out according to the factor triggering the surge phenomenon, so that the surge phenomenon cannot be avoided in the process of controlling the ETV.
Therefore, the accuracy of the compressor anti-surge control is low in the mode.
Disclosure of Invention
The embodiment of the application provides an anti-surge control method, an anti-surge control device, electronic equipment and a storage medium, which are used for improving the accuracy of anti-surge control of a compressor.
In a first aspect, an embodiment of the present application provides an anti-surge control method, including:
In the closing process of the electronic control throttle valve ETV, determining the actual pressure ratio of the air compressor at the current measuring moment through a pressure sensor; wherein, the actual pressure ratio represents: the ratio of the total outlet pressure to the total inlet pressure of the air compressor at the current measurement moment;
Determining a target pressure ratio interval to which an actual pressure ratio belongs based on a candidate pressure ratio interval set corresponding to the current folded flow of the air compressor; wherein, the current folded flow is characterized: the gas quantity entering the gas compressor at the current measurement moment;
and controlling the ETV based on the ETV control mode set in the corresponding target pressure ratio interval.
In a second aspect, an embodiment of the present application further provides an anti-surge control apparatus, including:
The acquisition module is used for determining the actual pressure ratio of the air compressor at the current measurement moment through the pressure sensor in the closing process of the electronic control throttle valve ETV; wherein, the actual pressure ratio represents: the ratio of the total outlet pressure to the total inlet pressure of the air compressor at the current measurement moment;
The determining module is used for determining a target pressure ratio interval to which the actual pressure ratio belongs based on a candidate pressure ratio interval set corresponding to the current folded flow of the compressor; wherein, the current folded flow is characterized: the gas quantity entering the gas compressor at the current measurement moment;
and the control module is used for controlling the ETV based on the ETV control mode set in the corresponding target pressure ratio interval.
In one possible embodiment, when determining the target pressure ratio interval to which the actual pressure ratio belongs based on the candidate pressure ratio interval set corresponding to the current folded flow rate of the compressor, the determining module is specifically configured to:
Determining the surge pressure ratio matched with the current folded flow from a preset compressor operation database, and obtaining corresponding upper limit and lower limit of the strong critical pressure ratio and the weak critical pressure ratio based on the surge pressure ratio and each pressure ratio difference value contained in a preset pressure ratio difference value set;
Based on the strong critical pressure ratio, the weak critical pressure ratio upper limit and the weak critical pressure ratio lower limit, obtaining a candidate pressure ratio interval set corresponding to the current reduced flow;
And determining a target pressure ratio section to which the actual pressure ratio belongs from the candidate pressure ratio section set.
In one possible embodiment, the target pressure ratio interval is a first pressure ratio candidate interval included in the set of pressure ratio candidate intervals, and each pressure ratio included in the first pressure ratio candidate interval is greater than a strong critical pressure ratio;
The control module is specifically configured to, when controlling the ETV based on the ETV control manner set in the corresponding target pressure ratio interval:
determining the current valve opening of the ETV through a valve opening sensor;
adjusting the current valve opening to be a preset fixed valve opening; wherein, fixed valve aperture satisfies the anti-surge valve aperture condition of predetermineeing.
In one possible embodiment, the target pressure ratio interval is a second candidate pressure ratio interval included in the candidate pressure ratio interval set, and each pressure ratio included in the second candidate pressure ratio interval is not greater than the strong critical pressure ratio and is greater than the weak critical pressure ratio upper limit;
The control module is specifically configured to, when controlling the ETV based on the ETV control manner set in the corresponding target pressure ratio interval:
Determining the current valve opening of the ETV through a valve opening sensor, and obtaining a corresponding first expected valve opening based on a preset valve slow closing speed and a set first valve opening adjustment time length;
And adjusting the current valve opening to be the first expected valve opening according to the slow closing speed of the valve.
In one possible embodiment, the target pressure ratio interval is a third candidate pressure ratio interval included in the candidate pressure ratio interval set, and each pressure ratio included in the third candidate pressure ratio interval is not greater than the upper limit of the weak critical pressure ratio and is not less than the lower limit of the weak critical pressure ratio;
The control module is specifically configured to, when controlling the ETV based on the ETV control manner set in the corresponding target pressure ratio interval:
acquiring the valve historical closing speed of the ETV at the last historical measurement time adjacent to the current measurement time;
acquiring a corresponding second expected valve opening based on the historical valve closing speed and the set second valve opening adjustment time length;
and adjusting the current valve opening to a second expected valve opening according to the historical closing speed of the valve.
In one possible embodiment, the target pressure ratio interval is a fourth candidate pressure ratio interval included in the set of candidate pressure ratio intervals, and each pressure ratio included in the fourth candidate pressure ratio interval is smaller than the lower limit of the weak critical pressure ratio;
The control module is specifically configured to, when controlling the ETV based on the ETV control manner set in the corresponding target pressure ratio interval:
Obtaining a corresponding third expected valve opening based on a preset valve normal closing speed and a set third valve opening adjustment time length;
and adjusting the current valve opening to be a third expected valve opening according to the normal closing speed of the valve.
In a third aspect, an electronic device is provided, comprising a processor and a memory, wherein the memory stores program code that, when executed by the processor, causes the processor to perform the steps of the anti-surge control method of the first aspect described above.
In a fourth aspect, a computer readable storage medium is presented, comprising program code for causing an electronic device to perform the steps of the anti-surge control method as described in the first aspect above, when said program code is run on the electronic device.
In a fifth aspect, a computer program product is provided, which, when called by a computer, causes the computer to perform the anti-surge control method steps according to the first aspect.
The application has the following beneficial effects:
In the anti-surge control method provided by the embodiment of the application, in the closing process of the ETV, the actual pressure ratio of the air compressor at the current measurement moment is determined by the pressure sensor, wherein the actual pressure ratio is characterized by: at the current measurement moment, the ratio of the total outlet pressure to the total inlet pressure of the air compressor is determined, and a target pressure ratio interval to which the actual pressure ratio belongs is determined based on a candidate pressure ratio interval set corresponding to the current folded flow of the air compressor, wherein the current folded flow represents: the amount of gas entering the compressor at the current measurement moment is controlled based on the ETV control mode set in the corresponding target pressure ratio interval.
According to the method, the ETV is controlled according to the target pressure ratio interval to which the actual pressure ratio belongs and the ETV control mode corresponding to the target pressure ratio interval, so that the technical defect that in the prior art, the judgment basis for controlling the closing of the ETV by adopting the first operation speed or the second operation speed is simpler only according to whether the closing degree of the ETV reaches a preset threshold value is avoided, and the accurate judgment is not directly performed according to the factor triggering the surge phenomenon is overcome, and therefore the accuracy of the anti-surge control of the compressor is improved.
Furthermore, other features and advantages of the application will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the application. The objectives and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it will be apparent that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art. In the drawings:
Fig. 1 schematically illustrates a structural diagram of an engine intake pipe according to an embodiment of the present application;
FIG. 2 is a flow chart illustrating an implementation of an anti-surge control method provided by an embodiment of the present application;
FIG. 3 is a schematic diagram schematically illustrating a target pressure ratio interval to which an actual pressure ratio belongs according to an embodiment of the present application;
FIG. 4 schematically illustrates a compressor combined operation curve provided by an embodiment of the present application;
FIG. 5 schematically illustrates a logic diagram for adjusting ETV according to an embodiment of the present application;
FIG. 6 is a schematic flow chart of a method for controlling logic of an ETV according to an embodiment of the present application;
Fig. 7 schematically illustrates a specific application scenario based on fig. 2 according to an embodiment of the present application;
FIG. 8 schematically illustrates a configuration of an anti-surge control device according to an embodiment of the present application;
fig. 9 schematically illustrates a structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the technical solutions of the present application, but not all embodiments. All other embodiments, based on the embodiments described in the present document, which can be obtained by a person skilled in the art without any creative effort, are within the scope of protection of the technical solutions of the present application.
In the description of the present application, "a plurality of" means "at least two". "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a exists alone, A and B exist together, and B exists alone. A is connected with B, and can be represented as follows: both cases of direct connection of A and B and connection of A and B through C. In addition, in the description of the present application, the words "first," "second," and the like are used merely for distinguishing between the descriptions and not be construed as indicating or implying a relative importance or order.
Before describing the anti-surge control method provided by the embodiment of the present application, for convenience of understanding, some terms and terminology related to the embodiment of the present application are briefly described and illustrated, as follows:
Surging: refers to the phenomenon of low frequency (usually only a few hertz or tens of hertz) and high amplitude (strong pressure and flow fluctuations) oscillations of the gas flow in the direction of the compressor axis. The low-frequency high-amplitude airflow oscillation is a large exciting force source, and can cause strong mechanical vibration and hot-end overtemperature of the turbocharger, and serious damage to components is caused in a short time, so that the compressor of the turbocharger is prevented from entering a surge area to work in any state.
Electronically controlled throttle valve: i.e. an air inlet throttle valve, and a butterfly valve is arranged after the inter-cooling for heat management to change the air inlet amount and improve the exhaust temperature.
Reduced flow rate: and calculating the dimensionless number of the air inlet quantity of the reaction supercharger through the air inlet temperature, the air inlet pressure, the air inlet flow, the air inlet ambient pressure and the air inlet temperature of the air compressor.
Electronic control unit (Electronic Control Unit, ECU): the computer is composed of micro controller, memory, input/output interface, A/D converter, shaping and driving integrated circuits.
It should be noted that the above term naming manner is only an example, and the naming manner of the term is not limited in the embodiments of the present application.
Further, based on the above nouns and related term explanations, the following briefly describes the design concept of the embodiment of the present application:
When the working condition of the air compressor is changed, the surge phenomenon is easy to occur, in the practical application scene, if the accelerator is suddenly lost after acceleration (namely, the accelerator is released) is decelerated, the engine can run from a large load area to a small load area, the ETV can be suddenly closed from the small closing degree to the large closing degree, so that the large air inlet pressure in an air inlet pipeline is blocked by the ETV, the circulation rate is greatly reduced, the air inlet pressure flow is changed, even the air inlet pressure flows back to the air compressor, the air compressor outlet pressure fluctuation is caused, the surge phenomenon is generated, the fatigue damage of internal parts such as air compressor blades is accelerated by the surge phenomenon, the existing cracks are rapidly expanded, the damage to the air compressor and the whole engine is caused when the crack is serious, and the service life of the engine is reduced.
In view of the above, the embodiment of the present application provides an anti-surge control method, which can alleviate the surge problem caused by engine thermal management, and effectively improve the service life of an engine, and specifically includes: in the closing process of the ETV, the actual pressure ratio of the compressor at the current measuring moment is determined through the pressure sensor, and then a target pressure ratio interval to which the actual pressure ratio belongs is determined based on a candidate pressure ratio interval set corresponding to the current folded flow of the compressor, so that the ETV is controlled based on an ETV control mode set corresponding to the target pressure ratio interval.
In particular, the following description will briefly explain the preferred embodiments of the present application by referring to the figures of the specification, and it should be understood that the preferred embodiments described herein are merely for the purpose of illustrating and explaining the technical solutions provided by the present application, are not intended to limit the present application, and embodiments and features in the embodiments to which the present application relates may be combined with each other without conflict.
In the embodiment of the application, the execution main body of the anti-surge control method can be a server, can be an independent physical server, can be a server cluster or a distributed system formed by a plurality of physical servers, and can also be a cloud server for providing cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, middleware services, domain name services, security services, content delivery networks (Content Delivery Network, CDNs), basic cloud computing services such as big data and artificial intelligent platforms and the like.
In particular, in the embodiment of the present application, the server is configured to determine, by means of the pressure sensor, an actual pressure ratio of the compressor at a current measurement time during the closing process of the ETV, where the actual pressure ratio is characterized by: the ratio of the total outlet pressure to the total inlet pressure of the air compressor at the current measurement moment; further, determining a target pressure ratio interval to which an actual pressure ratio belongs based on a candidate pressure ratio interval set corresponding to the current folded flow of the air compressor, wherein the current folded flow represents: the current measurement moment is the amount of gas entering the gas compressor; finally, the ETV is controlled based on the ETV control mode set corresponding to the target pressure ratio interval.
In the embodiment of the present application, the server may be an ECU matched with the engine; in addition, referring to fig. 1, a schematic structural diagram of an engine air intake pipeline according to an embodiment of the present application is shown, where the engine air intake pipeline includes: an intake pipe 1, a supercharger compressor 2, a pre-charge pressure 3, an intercooler 4, a Flow meter 5 (e.g., mass Air Flow (MAF) meter), ETV6, an intake Air temperature/pressure sensor 7, an engine 8, an accelerator opening sensor 9, an exhaust gas recirculation system (Exhaust Gas Recirculation, EGR) valve 10, and a supercharger turbine 11, wherein the supercharger compressor 2 and the supercharger turbine 11 are both turbochargers.
The anti-surge control method provided by the exemplary embodiments of the present application will be described below with reference to the accompanying drawings in conjunction with the above-described execution bodies and the above-described engine structures, and it should be noted that the above-described execution bodies and the above-described engine structures are merely shown for the convenience of understanding the spirit and principles of the present application, and the embodiments of the present application are not limited in this respect.
Referring to fig. 2, which is a flowchart of an implementation of an anti-surge control method according to an embodiment of the present application, an execution body uses an ECU as an example, and a specific implementation flow of the method is as follows:
S201: in the closing process of the ETV, the actual pressure ratio of the compressor at the current measuring moment is determined through the pressure sensor.
Wherein, the actual pressure ratio represents: at the current measuring moment, the ratio of the total outlet pressure to the total inlet pressure of the compressor.
Specifically, when step S201 is executed, that is, during the valve opening of the ETV is reduced or the ETV is closed, the ECU measures, through the pressure sensor in the turbocharger, the gas pressure between the inside and the outside of the compressor, that is, the total outlet pressure and the total inlet pressure, at any measurement time, and further obtains the corresponding pressure ratio according to the obtained total outlet pressure and total inlet pressure, so that the actual pressure ratio of the compressor at the current measurement time can be determined through the pressure sensor.
In the closing process of the ETV, the ECU obtains the current measurement time through the pressure sensor, and the gas pressure (the total outlet pressure and the total inlet pressure) between the inside and the outside of the compressor is sequentially recorded as P 1 and P 2, and further, the actual pressure ratio between P 1 and P 2 is obtained by combining a preset actual pressure ratio calculation formula, where the preset actual pressure ratio calculation formula is specifically as follows:
Where δ represents the actual pressure ratio, P 1 represents the gas pressure inside the compressor, i.e. the total outlet pressure, and P 2 represents the gas pressure outside the compressor, i.e. the total outlet pressure.
For example, assuming that the above-mentioned outlet air pressure P 1 =58.2 Kpa and inlet air pressure P 2 =25.3 Kpa, the ECU obtains the corresponding actual pressure ratio based on the above-mentioned calculation formula of the preset actual pressure ratio after obtaining the outlet air pressure P 1 and the inlet air pressure P 2
S202: and determining a target pressure ratio interval to which the actual pressure ratio belongs based on a candidate pressure ratio interval set corresponding to the current folded flow of the air compressor.
Specifically, referring to fig. 3, when step S202 is executed, the ECU may determine, from a preset compressor operation database, a surge pressure ratio that matches the current folded flow after determining the actual pressure ratio of the compressor at the current measurement time, and obtain corresponding upper limit and lower limit of the strong critical pressure ratio, the weak critical pressure ratio, based on the surge pressure ratio and the pressure ratio differences included in the preset pressure ratio difference set; then, based on the strong critical pressure ratio, the weak critical pressure ratio upper limit and the weak critical pressure ratio lower limit, a candidate pressure ratio interval set corresponding to the current folded flow is obtained; finally, a target pressure ratio section to which the actual pressure ratio belongs is determined from the candidate pressure ratio section set.
It should be noted that, under a certain specific reduced flow rate, if the actual pressure ratio of the compressor reaches or exceeds the surge pressure ratio, the corresponding surge occurs, and, under the certain specific reduced flow rate, the strong critical pressure ratio, the weak critical pressure ratio upper limit and the weak critical pressure ratio lower limit are all smaller than the corresponding surge pressure ratio, it is not difficult to know that the strong critical pressure ratio is larger than the weak critical pressure ratio upper limit and is larger than the weak critical pressure ratio lower limit, that is, the critical pressure ratio interval between the strong critical pressure ratio and the weak critical pressure ratio upper limit and the critical pressure ratio interval between the weak critical pressure ratio upper limit and the weak critical pressure ratio lower limit can be obtained according to the strong critical pressure ratio, the weak critical pressure ratio upper limit and the weak critical pressure ratio lower limit, and that is, if the actual pressure ratio of the compressor reaches the strong critical pressure ratio, the probability of the surge phenomenon of the compressor is very large, and similarly, if the actual pressure ratio of the compressor reaches the weak critical pressure ratio upper limit or the weak critical pressure ratio lower limit, the probability of the surge phenomenon of the compressor is relatively small.
Exemplary, referring to fig. 4, a schematic diagram of a combined operation curve of a compressor according to an embodiment of the present application includes: the surge line A, the strong critical pressure ratio line B, the weak critical pressure ratio upper limit epsilon Hi line C and the weak critical pressure ratio lower limit epsilon Lo line D are obtained according to the weak critical pressure ratio hysteresis line, and the fact that B, C, D lines are obtained by keeping a certain margin (namely pressure ratio difference value) according to the surge line A is that the margin which can be kept is smaller when surge is easy to occur according to the surge condition calibration of the supercharger.
Further, since the above set of candidate pressure ratio intervals is obtained according to the strong critical pressure ratio, the weak critical pressure ratio upper limit, and the weak critical pressure ratio lower limit, it is easy to see that the set of candidate pressure ratio intervals at any measurement time each includes 4 candidate pressure ratio intervals, that is, a first candidate pressure ratio interval, a second candidate pressure ratio interval, a third candidate pressure ratio interval, and a fourth candidate pressure ratio interval, wherein each pressure ratio included in the first candidate pressure ratio interval is greater than the strong critical pressure ratio, each pressure ratio included in the second candidate pressure ratio interval is not greater than the strong critical pressure ratio, and is greater than the weak critical pressure ratio upper limit, each pressure ratio included in the third candidate pressure ratio interval is not greater than the weak critical pressure ratio upper limit, and is not less than the weak critical pressure ratio lower limit, and each pressure ratio included in the fourth candidate pressure ratio interval is less than the weak critical pressure ratio lower limit.
S203: and controlling the ETV based on the ETV control mode set in the corresponding target pressure ratio interval.
Specifically, when step S203 is executed, the ECU may control the ETV based on the ETV control manner set in the corresponding target pressure ratio section after determining the target pressure ratio section to which the actual pressure ratio belongs.
In view of the fact that the target pressure ratio section to which the actual pressure ratio belongs may be any one of the 4 candidate pressure ratio sections included in the above-described candidate pressure ratio section set, there are 4 cases in which the ECU controls the ETV based on the ETV control manner set for the corresponding target pressure ratio section:
Case 1: if the target pressure ratio interval is the first candidate pressure ratio interval, the current valve opening of the ETV can be determined through the valve opening sensor, and therefore the current valve opening is adjusted to be the preset fixed valve opening.
The preset fixed valve opening meets a preset anti-surge valve opening condition, and it should be noted that the preset anti-surge valve opening condition includes, but is not limited to, other surge enabling conditions, for example, the boost pressure is greater than a set value, the intake air flow is less than the set value, the upstream temperature of Selective Catalytic Reduction (SCR) is less than the set value, the required torque is reduced, and the requirement includes a complete vehicle condition, for example, in a lower gear, etc.
Therefore, based on the above manner, the surge is easy to occur when the current valve opening is smaller, so that the current valve opening is adjusted to be larger (i.e. the valve opening is fixed, for example, 60%), and the surge is avoided because the ETV is closed too fast.
Case 2: if the target pressure ratio interval is the second candidate pressure ratio interval, determining the current valve opening of the ETV through a valve opening sensor, and obtaining a corresponding first expected valve opening based on a preset valve slow closing speed and a set first valve opening adjustment time length, so that the current valve opening is adjusted to be the first expected valve opening according to the valve slow closing speed.
It should be noted that, the preset slow closing speed of the valve and the set first valve opening adjustment duration are obtained empirically, and are mainly used for ensuring that the surge phenomenon does not occur in the closing process of the compressor.
Optionally, when the ECU determines that the target pressure ratio interval is the second candidate pressure ratio interval and needs to adjust the current valve opening to the first expected valve opening according to the slow valve closing speed, there may be a time delay for switching the states, for example, T1.
Case 3: if the target pressure ratio interval is a third candidate pressure ratio interval, determining the current valve opening of the ETV through a valve opening sensor, and acquiring the valve historical closing speed of the ETV at the last historical measurement time adjacent to the current measurement time; then, based on the historical closing speed of the valve and the set second valve opening adjustment time length, obtaining a corresponding second expected valve opening; finally, the current valve opening is adjusted to a second desired valve opening according to the historical valve closing speed.
It should be noted that the set second valve opening adjustment duration is obtained empirically, and is mainly used for ensuring that no surge phenomenon occurs in the closing process of the compressor.
Case 4: if the target pressure ratio interval is the fourth candidate pressure ratio interval, determining the current valve opening of the ETV through a valve opening sensor, and obtaining a corresponding third expected valve opening based on the preset valve normal closing speed and the set third valve opening adjustment time length, so that the current valve opening is adjusted to the third expected valve opening according to the valve normal closing speed.
It should be noted that, the preset normal closing speed of the valve and the set third valve opening adjustment duration are obtained empirically, and are mainly used for ensuring that the surge phenomenon does not occur in the closing process of the compressor.
Optionally, when the ECU determines that the target pressure ratio interval is the fourth candidate pressure ratio interval, the current valve opening needs to be adjusted to the third expected valve opening according to the normal closing speed of the valve, and there may be a time delay of switching between states, for example, T2.
In addition, it should be noted that the set first valve opening adjustment duration, the set second valve opening adjustment duration, and the set third valve opening adjustment duration may be the same or different, and in the embodiment of the present application, the values thereof are not limited in any way.
Based on the above-described manner, according to the degree of surging (i.e., the possibility of surging), the control speed of the ETV and the set valve opening (fixed valve opening and expected valve opening) are changed, and the occurrence of surging is avoided with as little influence on thermal management as possible.
In a possible implementation manner, when step S203 is executed, referring to fig. 5, a logic schematic diagram for adjusting ETV provided by the embodiment of the present application is shown, facSrgB _cur, facsrgc_cur, facsrgd_cur are respectively based on the curve calibrated by B, C, D, drTvaDecNor _map is a preset normal closing speed of the valve, drTvaDecSlow _map is a preset slow closing speed of the valve, rB is a preset fixed valve opening, drTvaInc _map is an opening speed of the ETV, rGovTvaRaw is a valve opening of the ETV without intervention, that is, the current valve opening, rGovTva is a corrected ETV valve opening, and rB is a preset fixed valve opening.
Further, when the ECU executes the anti-surge control method, the current reduced flow passes through facSrgC _cur to obtain an upper limit epsilon Hi of the weak critical pressure ratio, passes through facSrgD _cur to obtain a lower limit epsilon Lo of the weak critical pressure ratio, if the actual pressure ratio epsilon exceeds epsilon Hi, the closing speed of ETV needs to be adjusted to DrTvaDecSlow _map, and the state switching has t1 delay; if the actual pressure ratio epsilon is lower than epsilon Lo, the closing speed of the ETV needs to be adjusted to DrTvaDecNor _MAP, and the state switching has t2 delay; if the actual pressure ratio ε is between εHi and εLo, then the closing rate of ETV can be maintained at the closing rate of the previous state; and obtaining a strong critical pressure ratio epsilon B according to the current reduced flow passing through facSrgB _CUR, and if the actual pressure ratio epsilon is larger than the strong critical pressure ratio epsilon B and meets other surge enabling conditions, adjusting the current valve opening of the ETV to be a preset fixed valve opening, so that the current valve opening of the ETV is adjusted to be an ETV opening rGovTva subjected to rate correction, wherein dpIntP is the change rate of the air inlet pressure, n is the rotating speed, epsilon is the pressure ratio, and Ac is the reduced flow.
Further, referring to fig. 6, a flowchart of a method for controlling logic of an ETV according to an embodiment of the present application is shown, where the steps of the method are specifically as follows:
s601: the actual pressure ratio is calculated.
S602: the actual pressure ratio is greater than the upper limit of the weak critical pressure ratio, if yes, the step S603 is carried out; if not, the process proceeds to S607.
S603: the actual pressure ratio is larger than the strong critical pressure ratio, if yes, S604 is executed, and after the current valve opening is adjusted to the preset fixed valve opening, S602 is executed; if not, the process proceeds to S605.
S604: and adjusting the current valve opening to be a preset fixed valve opening.
S605: and adjusting the current valve opening to be the first expected valve opening according to the slow closing speed of the valve.
S606: the control of ETV is ended.
S607: the actual pressure ratio is smaller than the lower limit of the weak critical pressure ratio, if yes, the step S608 is performed, and after the current valve opening is adjusted to the third expected valve opening, the step S606 is performed; if not, the process proceeds to S609, and after the current valve opening is adjusted to the second expected valve opening, the process proceeds to S606.
S608: and adjusting the current valve opening to be a third expected valve opening according to the normal closing speed of the valve.
S609: and adjusting the current valve opening to a second expected valve opening according to the historical closing speed of the valve.
Therefore, referring to fig. 7, which is a schematic diagram of a specific application scenario of anti-surge control provided by the embodiment of the present application, the ECU determines, during the closing process of ETV, the current measurement time (for example, 2022.09.28 14:37:29) through a pressure sensor. Pr, and the actual pressure ratio of the compressor is 1.5, where the actual pressure ratio is represented by: at the current measurement moment, the ratio of the total outlet pressure to the total inlet pressure of the air compressor is determined, and a target pressure ratio section Pre.Rat.Ran3 to which the actual pressure ratio 1.5 belongs is determined based on a candidate pressure ratio section set can.Pre.set corresponding to the current folded flow of the air compressor, so that the ETV is controlled based on an ETV control mode Con.Mode3 set corresponding to the target pressure ratio section.
In summary, in the anti-surge control method provided by the embodiment of the present application, during the closing process of the ETV, the actual pressure ratio of the compressor at the current measurement time is determined by the pressure sensor, where the actual pressure ratio is represented by: at the current measurement moment, the ratio of the total outlet pressure to the total inlet pressure of the air compressor is determined, and a target pressure ratio interval to which the actual pressure ratio belongs is determined based on a candidate pressure ratio interval set corresponding to the current folded flow of the air compressor, wherein the current folded flow represents: the amount of gas entering the compressor at the current measurement moment is controlled based on the ETV control mode set in the corresponding target pressure ratio interval.
According to the method, the ETV is controlled according to the target pressure ratio interval to which the actual pressure ratio belongs and the ETV control mode corresponding to the target pressure ratio interval, so that the technical defect that in the prior art, the judgment basis for controlling the closing of the ETV by adopting the first operation speed or the second operation speed is simpler only according to whether the closing degree of the ETV reaches a preset threshold value is avoided, and the accurate judgment is not directly performed according to the factor triggering the surge phenomenon is overcome, and therefore the accuracy of the anti-surge control of the compressor is improved.
Further, based on the same technical concept, the embodiment of the application provides an anti-surge control device, which is used for realizing the flow of the method.
Referring to fig. 8, the anti-surge control apparatus includes: an acquisition module 801, a determination module 802, and a control module 803, wherein:
The acquiring module 801 is configured to determine, by using a pressure sensor, an actual pressure ratio of the compressor at a current measurement time during a closing process of the electronically controlled throttle valve ETV; wherein, the actual pressure ratio represents: the ratio of the total outlet pressure to the total inlet pressure of the air compressor at the current measurement moment;
a determining module 802, configured to determine a target pressure ratio interval to which an actual pressure ratio belongs, based on a candidate pressure ratio interval set corresponding to a current folded flow of the compressor; wherein, the current folded flow is characterized: the gas quantity entering the gas compressor at the current measurement moment;
the control module 803 is configured to control the ETV based on the ETV control manner set in the corresponding target pressure ratio interval.
In one possible embodiment, when determining the target pressure ratio interval to which the actual pressure ratio belongs based on the candidate pressure ratio interval set corresponding to the current folded flow rate of the compressor, the determining module 802 is specifically configured to:
Determining the surge pressure ratio matched with the current folded flow from a preset compressor operation database, and obtaining corresponding upper limit and lower limit of the strong critical pressure ratio and the weak critical pressure ratio based on the surge pressure ratio and each pressure ratio difference value contained in a preset pressure ratio difference value set;
Based on the strong critical pressure ratio, the weak critical pressure ratio upper limit and the weak critical pressure ratio lower limit, obtaining a candidate pressure ratio interval set corresponding to the current reduced flow;
And determining a target pressure ratio section to which the actual pressure ratio belongs from the candidate pressure ratio section set.
In one possible embodiment, the target pressure ratio interval is a first pressure ratio candidate interval included in the set of pressure ratio candidate intervals, and each pressure ratio included in the first pressure ratio candidate interval is greater than a strong critical pressure ratio;
the control module 803 is specifically configured to, when controlling the ETV based on the ETV control manner set in the corresponding target pressure ratio interval:
determining the current valve opening of the ETV through a valve opening sensor;
adjusting the current valve opening to be a preset fixed valve opening; wherein, fixed valve aperture satisfies the anti-surge valve aperture condition of predetermineeing.
In one possible embodiment, the target pressure ratio interval is a second candidate pressure ratio interval included in the candidate pressure ratio interval set, and each pressure ratio included in the second candidate pressure ratio interval is not greater than the strong critical pressure ratio and is greater than the weak critical pressure ratio upper limit;
the control module 803 is specifically configured to, when controlling the ETV based on the ETV control manner set in the corresponding target pressure ratio interval:
Determining the current valve opening of the ETV through a valve opening sensor, and obtaining a corresponding first expected valve opening based on a preset valve slow closing speed and a set first valve opening adjustment time length;
And adjusting the current valve opening to be the first expected valve opening according to the slow closing speed of the valve.
In one possible embodiment, the target pressure ratio interval is a third candidate pressure ratio interval included in the candidate pressure ratio interval set, and each pressure ratio included in the third candidate pressure ratio interval is not greater than the upper limit of the weak critical pressure ratio and is not less than the lower limit of the weak critical pressure ratio;
the control module 803 is specifically configured to, when controlling the ETV based on the ETV control manner set in the corresponding target pressure ratio interval:
acquiring the valve historical closing speed of the ETV at the last historical measurement time adjacent to the current measurement time;
acquiring a corresponding second expected valve opening based on the historical valve closing speed and the set second valve opening adjustment time length;
and adjusting the current valve opening to a second expected valve opening according to the historical closing speed of the valve.
In one possible embodiment, the target pressure ratio interval is a fourth candidate pressure ratio interval included in the set of candidate pressure ratio intervals, and each pressure ratio included in the fourth candidate pressure ratio interval is smaller than the lower limit of the weak critical pressure ratio;
the control module 803 is specifically configured to, when controlling the ETV based on the ETV control manner set in the corresponding target pressure ratio interval:
Obtaining a corresponding third expected valve opening based on a preset valve normal closing speed and a set third valve opening adjustment time length;
and adjusting the current valve opening to be a third expected valve opening according to the normal closing speed of the valve.
Based on the same technical concept, the embodiment of the application also provides electronic equipment, which can realize the flow of the anti-surge control method provided by the embodiment of the application. In one embodiment, the electronic device may be a server, a terminal device, or other electronic device. As shown in fig. 9, the electronic device may include:
At least one processor 901, and a memory 902 connected to the at least one processor 901, the specific connection medium between the processor 901 and the memory 902 is not limited in the embodiment of the present application, and the connection between the processor 901 and the memory 902 through the bus 900 is exemplified in fig. 9. Bus 900 is shown in bold lines in fig. 9, and the manner in which other components are connected is illustrated schematically and not by way of limitation. The bus 900 may be divided into an address bus, a data bus, a control bus, etc., and is represented by only one thick line in fig. 9 for convenience of representation, but does not represent only one bus or one type of bus. Or processor 901 may also be referred to as a controller, without limitation on the name.
In an embodiment of the present application, the memory 902 stores instructions executable by the at least one processor 901, and the at least one processor 901 can perform an anti-surge control method as previously discussed by executing the instructions stored by the memory 902. The processor 901 may implement the functions of the respective modules in the apparatus shown in fig. 8.
The processor 901 is a control center of the apparatus, and may connect various parts of the entire control device using various interfaces and lines, and by executing or executing instructions stored in the memory 902 and invoking data stored in the memory 902, various functions of the apparatus and processing data, thereby performing overall monitoring of the apparatus.
In one possible design, processor 901 may include one or more processing units, and processor 901 may integrate an application processor that primarily processes operating systems, user interfaces, application programs, and the like, and a modem processor that primarily processes wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 901. In some embodiments, processor 901 and memory 902 may be implemented on the same chip, and in some embodiments they may be implemented separately on separate chips.
The processor 901 may be a general purpose processor such as a CPU, digital signal processor, application specific integrated circuit, field programmable gate array or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, and may implement or perform the methods, steps and logic blocks disclosed in embodiments of the present application. The general purpose processor may be a microprocessor or any conventional processor or the like. The steps of an anti-surge control method disclosed in connection with the embodiments of the present application may be directly embodied as being performed by a hardware processor, or may be performed by a combination of hardware and software modules in the processor.
The memory 902 is a non-volatile computer-readable storage medium that can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules. The Memory 902 may include at least one type of storage medium, which may include, for example, flash Memory, hard disk, multimedia card, card Memory, random access Memory (Random Access Memory, RAM), static random access Memory (Static Random Access Memory, SRAM), programmable Read-Only Memory (Programmable Read Only Memory, PROM), read-Only Memory (ROM), charged erasable programmable Read-Only Memory (ELECTRICALLY ERASABLE PROGRAMMABLE READ-Only Memory, EEPROM), magnetic Memory, magnetic disk, optical disk, and the like. Memory 902 is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such. The memory 902 of embodiments of the present application may also be circuitry or any other device capable of performing memory functions for storing program instructions and/or data.
By programming the processor 901, the code corresponding to one of the anti-surge control methods described in the foregoing embodiments can be solidified into a chip, so that the chip can execute the steps of one of the anti-surge control methods of the embodiment shown in fig. 2 when running. How to design and program the processor 901 is a technology well known to those skilled in the art, and will not be described in detail herein.
Based on the same inventive concept, the embodiments of the present application also provide a storage medium storing computer instructions that, when run on a computer, cause the computer to perform an anti-surge control method as discussed above.
In some possible embodiments, the application provides that aspects of an anti-surge control method can also be implemented in the form of a program product comprising program code for causing a control apparatus to carry out the steps of an anti-surge control method according to the various exemplary embodiments of the application as described in the specification, when the program product is run on a device.
Furthermore, although the operations of the methods of the present application are depicted in the drawings in a particular order, this is not required or suggested that these operations must be performed in this particular order or that all of the illustrated operations must be performed in order to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step to perform, and/or one step decomposed into multiple steps to perform.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (7)
1. An anti-surge control method, comprising:
in the closing process of the electronic control throttle valve ETV, determining the actual pressure ratio of the air compressor at the current measuring moment through a pressure sensor; wherein the actual pressure ratio characterizes: the ratio of the total outlet pressure to the total inlet pressure of the air compressor at the current measurement moment;
Determining a target pressure ratio interval to which the actual pressure ratio belongs based on a candidate pressure ratio interval set corresponding to the current folded flow of the compressor; wherein the current folded flow is characterized by: the determining, based on the candidate pressure ratio interval set corresponding to the current folded flow of the compressor, the target pressure ratio interval to which the actual pressure ratio belongs, includes:
Determining the surge pressure ratio matched with the current folded flow from a preset compressor operation database, and obtaining corresponding strong critical pressure ratio, weak critical pressure ratio upper limit and weak critical pressure ratio lower limit based on the surge pressure ratio and each pressure ratio difference value contained in a preset pressure ratio difference value set;
based on the Jiang Linjie pressure ratios, the weak critical pressure ratio upper limit and the weak critical pressure ratio lower limit, a candidate pressure ratio interval set corresponding to the current folded flow is obtained;
Determining a target pressure ratio interval to which the actual pressure ratio belongs from the candidate pressure ratio interval set;
controlling the ETV based on an ETV control mode corresponding to the target pressure ratio interval; the target pressure ratio interval is a third pressure ratio interval contained in the pressure ratio interval set, and each pressure ratio contained in the third pressure ratio interval is not greater than the upper limit of the weak critical pressure ratio and is not less than the lower limit of the weak critical pressure ratio;
the controlling the ETV based on the ETV control mode set corresponding to the target pressure ratio interval includes:
determining the current valve opening of the ETV through a valve opening sensor;
Acquiring the valve history closing speed of the ETV at the last history measurement time adjacent to the current measurement time;
Acquiring a corresponding second expected valve opening based on the historical valve closing speed and the set second valve opening adjustment time length;
and adjusting the current valve opening to the second expected valve opening according to the historical valve closing speed.
2. The method of claim 1, wherein the target pressure ratio interval is a first pressure ratio interval included in the set of pressure ratio interval candidates, each pressure ratio included in the first pressure ratio interval candidate being greater than the Jiang Linjie pressure ratios;
the controlling the ETV based on the ETV control mode set corresponding to the target pressure ratio interval includes:
determining the current valve opening of the ETV through a valve opening sensor;
adjusting the current valve opening to be a preset fixed valve opening; wherein the fixed valve opening meets the preset anti-surge valve opening condition.
3. The method of claim 1, wherein the target pressure ratio interval is a second candidate pressure ratio interval comprised by the set of candidate pressure ratio intervals, each pressure ratio comprised by the second candidate pressure ratio interval is not greater than the Jiang Linjie pressure ratio and is greater than the weak critical pressure ratio upper limit;
the controlling the ETV based on the ETV control mode set corresponding to the target pressure ratio interval includes:
determining the current valve opening of the ETV through a valve opening sensor, and obtaining a corresponding first expected valve opening based on a preset slow valve closing speed and a set first valve opening adjustment time length;
And adjusting the current valve opening to the first expected valve opening according to the slow closing speed of the valve.
4. A method according to claim 1, 2 or 3, wherein the target pressure ratio interval is a fourth candidate pressure ratio interval comprised by the set of candidate pressure ratio intervals, each pressure ratio comprised by the fourth candidate pressure ratio interval being less than the weak critical pressure ratio lower limit;
the controlling the ETV based on the ETV control mode set corresponding to the target pressure ratio interval includes:
Obtaining a corresponding third expected valve opening based on a preset valve normal closing speed and a set third valve opening adjustment time length;
And adjusting the current valve opening to the third expected valve opening according to the normal closing speed of the valve.
5. An anti-surge control apparatus comprising
The acquisition module is used for determining the actual pressure ratio of the compressor at the current measurement moment in the closing process of the electronic control throttle valve ETV; wherein the actual pressure ratio characterizes: the ratio of the total outlet pressure to the total inlet pressure of the air compressor at the current measurement moment;
The determining module is used for determining a target pressure ratio interval to which the actual pressure ratio belongs based on a candidate pressure ratio interval set corresponding to the current folded flow of the compressor; wherein the current folded flow is characterized by: the determining module is specifically configured to, when the current measurement time enters the gas amount of the gas compressor and the candidate pressure ratio interval set corresponding to the current folded flow of the gas compressor is based on determining the target pressure ratio interval to which the actual pressure ratio belongs:
Determining the surge pressure ratio matched with the current folded flow from a preset compressor operation database, and obtaining corresponding strong critical pressure ratio, weak critical pressure ratio upper limit and weak critical pressure ratio lower limit based on the surge pressure ratio and each pressure ratio difference value contained in a preset pressure ratio difference value set;
based on the Jiang Linjie pressure ratios, the weak critical pressure ratio upper limit and the weak critical pressure ratio lower limit, a candidate pressure ratio interval set corresponding to the current folded flow is obtained;
Determining a target pressure ratio interval to which the actual pressure ratio belongs from the candidate pressure ratio interval set;
the control module is used for controlling the ETV based on an ETV control mode corresponding to the target pressure ratio interval; the target pressure ratio interval is a third pressure ratio interval contained in the pressure ratio interval set, and each pressure ratio contained in the third pressure ratio interval is not greater than the upper limit of the weak critical pressure ratio and is not less than the lower limit of the weak critical pressure ratio;
the control module is specifically configured to, when controlling the ETV based on the ETV control manner set corresponding to the target pressure ratio interval:
determining the current valve opening of the ETV through a valve opening sensor;
Acquiring the valve history closing speed of the ETV at the last history measurement time adjacent to the current measurement time;
Acquiring a corresponding second expected valve opening based on the historical valve closing speed and the set second valve opening adjustment time length;
and adjusting the current valve opening to the second expected valve opening according to the historical valve closing speed.
6. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of any of claims 1-4 when executing the computer program.
7. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method according to any of claims 1-4.
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| CN114576017A (en) * | 2022-03-11 | 2022-06-03 | 浙江吉利控股集团有限公司 | Control method and device for supercharged engine without air inlet pressure relief valve and vehicle |
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| CN114576017A (en) * | 2022-03-11 | 2022-06-03 | 浙江吉利控股集团有限公司 | Control method and device for supercharged engine without air inlet pressure relief valve and vehicle |
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