CN113323751B - Overspeed protection control method for variable-section supercharger - Google Patents

Overspeed protection control method for variable-section supercharger Download PDF

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Publication number
CN113323751B
CN113323751B CN202110744880.3A CN202110744880A CN113323751B CN 113323751 B CN113323751 B CN 113323751B CN 202110744880 A CN202110744880 A CN 202110744880A CN 113323751 B CN113323751 B CN 113323751B
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supercharger
engine
real
value
control unit
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CN113323751A (en
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赵昌鹏
金明
李书伟
王善元
毛勇
余国强
邓基峰
贾育恒
高光哲
李利员
王芳
刘凯
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Dongfeng Automobile Co Ltd
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Dongfeng Automobile Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F02B37/22—Control of the pumps by varying cross-section of exhaust passages or air passages, e.g. by throttling turbine inlets or outlets or by varying effective number of guide conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0002—Controlling intake air
    • F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F02B2037/122—Control of rotational speed of the pump
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supercharger (AREA)

Abstract

A variable cross-section supercharger overspeed protection control method includes obtaining a boost pressure demand value P corresponding to the current rotation speed and torque of an engine and a boundary ratio N of an exhaust pressure value and a boost pressure value of the engine through rotation speed and torque, comparing the boost pressure demand value P with a real-time boost pressure P1 'of the engine, comparing the value of the boost pressure demand value P with the boundary ratio N when the boost pressure demand value P is smaller than the real-time boost pressure P1', keeping the cross-sectional area of a supercharger turbine end flow passage unchanged when the value of P2 '/P1' is equal to the value of N, and reducing the cross-sectional area of the supercharger turbine end flow passage when the value of P2 '/P1' is smaller than the value of N. The control method does not need to arrange a sensor to measure the rotating speed of the supercharger, and can ensure that the overspeed operation does not occur under the condition of aging of the supercharger.

Description

Overspeed protection control method for variable-section supercharger
Technical Field
The invention relates to a supercharger control method, in particular to a variable-section supercharger overspeed protection control method, which is particularly suitable for preventing the variable-section supercharger from running overspeed.
Background
In the field of automobile engines equipped with turbochargers, there are two common forms of turbochargers: a wastegate valve structure, a variable cross-sectional structure. All the exhaust gas generated by the engine with the variable-section supercharger passes through the variable-section mechanism, the energy utilization rate of the exhaust gas is higher, and therefore the engine can achieve higher responsiveness and higher power more easily. The variable cross-section structure of part of the supercharger is an annular structure consisting of a series of variable-angle blades, a driving ring of each blade is connected with an external driving motor through a crank, and the driving motors receive signals of the whole vehicle controller to act. When the vehicle control unit sends a control signal, the motor adjusts the angle of the blade according to the driving signal, and the section of the flow passage of the supercharger is changed, so that the performance of the engine is changed. Under the same exhaust condition, the rotating speed of the impeller can be changed by changing the section of the flow passage of the supercharger, so that the supercharging pressure is changed.
The method is limited by the material of the impeller, and the blades are cracked due to overlarge centrifugal force when the rotating speed of the impeller is overhigh, one mode of the existing supercharger overspeed control mode is that a rotating speed sensor is arranged on the supercharger, and an ECU is limited to drive an actuator by actually measuring the rotating speed value of the impeller, but the sensor for measuring the rotating speed of the supercharger is expensive and is not easy to install, and meanwhile, special equipment is required to be connected for monitoring; in the other conventional control method, the required supercharging value and the limit value in the MAP are compared to determine a given supercharging pressure value, and then the opening of the supercharger blade is adjusted according to the given supercharging pressure value.
Disclosure of Invention
The invention aims to overcome the problems that a rotating speed sensor is needed in supercharger control and the overspeed is easy to occur when the supercharger is aged in the prior art, and provides an overspeed protection control method of a variable-section supercharger, which does not need a rotating speed sensor and can prevent the overspeed of the supercharger from occurring under the condition of aging.
In order to achieve the above purpose, the technical solution of the invention is as follows:
a variable cross-section supercharger overspeed protection control method is based on a variable cross-section supercharger, wherein an actuator and a cross-section adjusting device are arranged in the supercharger, the power output end of the actuator is in transmission fit with the cross-section adjusting device, and the control end of the actuator is connected with the supercharger control signal output end of a vehicle control unit; the control method comprises the following steps:
s1, acquiring real-time operation parameters of the engine by the vehicle control unit:
the vehicle control unit acquires real-time boost pressure P1 ', real-time exhaust pressure P2', real-time rotating speed and real-time torque of an engine;
the vehicle control unit queries a basic map according to the real-time rotating speed and the real-time torque of the engine to obtain a real-time supercharging pressure demand value P;
the vehicle control unit queries a boundary ratio table according to the real-time rotating speed and the real-time torque of the engine to obtain a boundary ratio N of an exhaust pressure value and a supercharging pressure value of the engine corresponding to the current rotating speed and the current torque;
s2, adjusting the sectional area of a flow passage at the turbine end of the supercharger:
after obtaining the engine operation parameters, the vehicle control unit compares the boost pressure demand value P with the real-time boost pressure P1':
if the boost pressure requirement value P is smaller than the real-time boost pressure P1', the opening degree of the section adjusting device is controlled by the vehicle control unit through the actuator to increase, so that the sectional area of a flow passage at the turbine end of the supercharger is increased;
if the boost pressure required value P is equal to the real-time boost pressure P1', the whole vehicle controller controls the opening of the section adjusting device to be unchanged through the actuator, so that the sectional area of a flow passage at the turbine end of the supercharger is kept unchanged;
if the boost pressure demand value P is greater than the real-time boost pressure P1 ', the vehicle control unit calculates the ratio P2 '/P1 ' of the real-time exhaust pressure P2 ' to the real-time boost pressure P1 ', and compares the value of P2 '/P1 ' with N:
a. when the value of P2 '/P1' is equal to the value of N, the vehicle control unit judges that the supercharger operates at the maximum rotating speed, and the vehicle control unit controls the opening of the section adjusting device to be unchanged through the actuator, so that the sectional area of a flow passage at the turbine end of the supercharger is kept unchanged;
b. when the value P2 '/P1' is smaller than the value N, the finished vehicle controller judges that the supercharger does not overspeed, and the finished vehicle controller controls the opening degree of the section adjusting device to be reduced through the actuator so as to reduce the sectional area of a flow passage at the turbine end of the supercharger;
c. when the value of P2 '/P1' is larger than the value of N, the finished vehicle controller reports an error.
The vehicle control unit obtains real-time supercharging pressure P1' through an air inlet pressure sensor, the air inlet pressure sensor is arranged on an air inlet manifold of an engine, and a signal output end of the air inlet pressure sensor is connected with an air inlet pressure signal input end of the vehicle control unit;
the finished automobile controller obtains real-time exhaust pressure P2' through an exhaust pressure sensor, the exhaust pressure sensor is arranged on an exhaust manifold of an engine, and a signal output end of the exhaust pressure sensor is connected with an exhaust pressure signal input end of the finished automobile controller.
The basic map is obtained by testing the engine on the engine performance rack, the basic map comprises the corresponding supercharging pressure requirement values of the engine under different rotating speeds and torques, and the basic map is stored in the vehicle control unit.
The boundary ratio table is obtained by testing the engine on an engine performance rack, and comprises corresponding boundary ratios of the engine under different rotating speeds and torques;
and the boundary ratio table is stored in the vehicle control unit.
In the process of testing an engine on an engine performance rack to obtain a boundary ratio table, the rotating speed of the supercharger is controlled not to exceed the maximum rotating speed by adjusting the sectional area of a flow passage at the turbine end of the variable-section supercharger.
In the process of testing the engine on the engine performance rack to obtain the boundary ratio table, the engine, the muffler and the engine post-processing system participate in the test together, and particulate matters in the DPF of the engine post-processing system are in a state of being accumulated to the maximum extent in the test process.
The frequency of the real-time running parameters of the engine obtained by the vehicle control unit is not more than 1000HZ, and the frequency of the control signals sent by the vehicle control unit to the actuator is not more than 1000 HZ.
The turbocharger is a variable nozzle turbocharger, the section adjusting device is an annular structure formed by a plurality of variable-angle blades, a driving ring of each blade is in transmission fit with a power output end of an actuator, and the actuator is a driving motor;
the opening of the blades is controlled by the driving motor through the driving ring to be increased, so that the sectional area of a flow passage at the turbine end of the supercharger is increased; and the opening of the driving motor through the driving ring to control the blades is reduced, so that the sectional area of a flow passage at the turbine end of the supercharger is reduced.
Compared with the prior art, the invention has the beneficial effects that:
1. in the overspeed protection control method for the variable-section supercharger, when the required value P of the supercharging pressure is smaller than the real-time supercharging pressure P1', the whole vehicle controller controls the sectional area of a flow passage at the turbine end of the supercharger to be increased, and the rotating speed of the supercharger is reduced, so that the supercharging pressure is reduced; when the boost pressure requirement value P is larger than the real-time boost pressure P1 ', the vehicle control unit calculates the ratio P2 '/P1 ' of the real-time exhaust pressure P2 ' and the real-time boost pressure P1 ' under the current rotating speed and torque, compares the ratio P2 '/P1 ' with the boundary ratio N under the current rotating speed and torque, and judges whether the supercharger reaches the maximum rotating speed according to the comparison result, so that whether the sectional area of a flow passage at the turbine end of the supercharger needs to be reduced to increase the rotating speed of the supercharger is judged, and overspeed of the supercharger is avoided; meanwhile, the rotating speed of the supercharger does not need to be measured by a sensor in the whole control process, the investment of measuring equipment is reduced, ECU storage resources occupied by data monitoring are reduced, and the control mode is safe and efficient. Therefore, the boundary ratio N is set in the design, so that the supercharger is prevented from overspeed under the condition of sudden increase of the torque; meanwhile, the rotating speed of the supercharger is not required to be measured by a sensor in the whole control process, the control reliability of the whole machine is improved, and the control method is safe and efficient.
2. In the overspeed protection control method for the variable-section supercharger, whether the supercharger is overspeed or not is judged by comparing the value of P2 '/P1 ' with a boundary ratio N, and when the supercharger is aged, the real-time supercharging pressure P1 ' is reduced under the condition of certain supercharger rotating speed, so that the value of P2 '/P1 ' measured under the condition of aging of the supercharger is increased, and when the value of P2 '/P1 ' reaches the boundary ratio under the current rotating speed and torque, the aged supercharger rotating speed is less than the maximum rotating speed. Therefore, in the design, the ratio P2 '/P1' of the real-time exhaust pressure P2 'to the real-time boost pressure P1' at the current speed and torque is used as a condition to judge whether the speed of the supercharger exceeds the speed, and even if the supercharger is aged, the overspeed can be ensured not to exceed the speed.
3. The invention relates to a variable cross-section supercharger overspeed protection control method, wherein a boundary ratio table is obtained by testing an engine on an engine performance bench, because exhaust pressure is influenced by the opening of a supercharger blade and the flow resistance of a DOC, a DPF, an SCR and a silencer, in the test of obtaining the boundary ratio table, the situation that particulate matters in a DPF of an engine post-treatment system are accumulated to the maximum degree is simulated for testing, the exhaust pressure reaches the maximum value during testing, the pumping loss and the intake resistance of the engine are increased, and the rotating speed of the supercharger is required to be increased in order to reach the set required supercharging pressure, so the maximum limit boundary of supercharger rotating speed protection can be obtained in the test, and the overspeed of the supercharger can not occur under the condition that the particulate matters in the DPF are accumulated to different degrees.
Drawings
Fig. 1 is a schematic diagram of a hardware connection structure of the present invention.
Fig. 2 is a schematic diagram of a supercharger.
In the figure: the device comprises a supercharger 1, a vehicle control unit 2, blades 3, an actuator 4, an intake pressure sensor 5 and an exhaust pressure sensor 6.
Detailed Description
The present invention will be described in further detail with reference to the following description and embodiments in conjunction with the accompanying drawings.
Referring to fig. 1 and 2, a variable cross-section supercharger overspeed protection control method is based on a variable cross-section supercharger 1, wherein an actuator 4 and a cross-section adjusting device are arranged in the supercharger 1, a power output end of the actuator 4 is in transmission fit with the cross-section adjusting device, and a control end of the actuator 4 is connected with a supercharger control signal output end of a vehicle control unit 2;
the control method comprises the following steps:
s1, acquiring real-time operation parameters of the engine by the vehicle control unit 2:
the vehicle control unit 2 acquires real-time boost pressure P1 ', real-time exhaust pressure P2', real-time rotating speed and real-time torque of an engine;
the vehicle control unit 2 queries a basic map according to the real-time rotating speed and the real-time torque of the engine to obtain a real-time supercharging pressure demand value P;
the vehicle control unit 2 queries a boundary ratio table according to the real-time rotating speed and the real-time torque of the engine to obtain a boundary ratio N of an exhaust pressure value and a supercharging pressure value of the engine corresponding to the current rotating speed and the current torque;
s2, adjusting the sectional area of a flow passage at the turbine end of the supercharger 1:
after obtaining the engine operating parameters, the vehicle control unit 2 compares the boost pressure demand value P with the real-time boost pressure P1':
if the boost pressure requirement value P is smaller than the real-time boost pressure P1', the opening degree of the section adjusting device is controlled by the vehicle control unit 2 through the actuator 4 to be increased, so that the sectional area of a flow passage at the turbine end of the supercharger 1 is increased;
if the boost pressure requirement value P is equal to the real-time boost pressure P1', the whole vehicle controller 2 controls the opening of the section adjusting device to be unchanged through the actuator 4, so that the sectional area of the flow passage at the turbine end of the supercharger 1 is kept unchanged;
if the boost pressure demand value P is greater than the real-time boost pressure P1 ', the vehicle control unit 2 calculates a ratio P2 '/P1 ' of the real-time exhaust pressure P2 ' to the real-time boost pressure P1 ', and compares the value of P2 '/P1 ' with N:
a. when the value P2 '/P1' is equal to the value N, the vehicle control unit 2 judges that the supercharger 1 is in maximum rotation speed operation, and the vehicle control unit 2 controls the opening degree of the section adjusting device to be unchanged through the actuator 4, so that the sectional area of a flow passage at the turbine end of the supercharger 1 is kept unchanged;
b. when the value P2 '/P1' is smaller than the value N, the vehicle control unit 2 judges that the supercharger 1 does not overspeed, and the vehicle control unit 2 controls the opening degree of the section adjusting device to be reduced through the actuator 4, so that the sectional area of a flow passage at the turbine end of the supercharger 1 is reduced;
c. when the value of P2 '/P1' is larger than the value of N, the finished vehicle controller reports an error.
The vehicle control unit 2 acquires real-time supercharging pressure P1' through an air inlet pressure sensor 5, the air inlet pressure sensor 5 is arranged on an air inlet manifold of the engine, and a signal output end of the air inlet pressure sensor 5 is connected with an air inlet pressure signal input end of the vehicle control unit 2;
the finished vehicle controller 2 obtains real-time exhaust pressure P2' through an exhaust pressure sensor 6, the exhaust pressure sensor 6 is arranged on an exhaust manifold of an engine, and a signal output end of the exhaust pressure sensor 6 is connected with an exhaust pressure signal input end of the finished vehicle controller 2.
The basic map is obtained by testing the engine on the engine performance bench, the basic map comprises the corresponding supercharging pressure requirement values of the engine under different rotating speeds and torques, and the basic map is stored in the vehicle control unit 2.
The boundary ratio table is obtained by testing the engine on an engine performance rack, and comprises corresponding boundary ratios of the engine under different rotating speeds and torques;
the boundary ratio table is stored in the vehicle control unit 2.
In the process of testing an engine on an engine performance rack to obtain a boundary ratio table, the rotating speed of the supercharger 1 is controlled not to exceed the maximum rotating speed by adjusting the sectional area of a turbine end flow passage of the variable-section supercharger 1.
In the process of testing the engine on the engine performance rack to obtain the boundary ratio table, the engine, the muffler and the engine post-processing system participate in the test together, and particulate matters in the DPF of the engine post-processing system are in a state of being accumulated to the maximum extent in the test process.
The frequency of the real-time running parameters of the engine obtained by the vehicle control unit 2 is not more than 1000HZ, and the frequency of the control signals sent by the vehicle control unit 2 to the actuator 4 is not more than 1000 HZ.
The turbocharger 1 is a variable nozzle turbocharger, the section adjusting device is an annular structure formed by a plurality of variable-angle blades 3, a driving ring of each blade 3 is in transmission fit with a power output end of an actuator 4, and the actuator 4 is a driving motor;
the opening of the driving motor is controlled by the driving ring to increase the opening of the blades 3, so that the sectional area of a flow passage at the turbine end of the supercharger 1 is increased; when the opening of the driving motor controlling the vanes 3 through the driving ring is reduced, the sectional area of the flow passage at the turbine end of the supercharger 1 is reduced.
The principle of the invention is illustrated as follows:
the DPF is an abbreviation of Diesel Particulate Filter, i.e., a Particulate trap.
The real-time rotating speed of the engine is measured by a rotating speed sensor, and the whole vehicle controller 2 obtains the real-time rotating speed of the engine through the rotating speed sensor;
the real-time torque of the engine is the required torque calculated by the vehicle controller 2 according to the current running state of the vehicle.
The variable cross-section structure of the supercharger 1 is an annular structure formed by a series of variable-angle blades 3, the actuator 4 is a driving motor, a driving ring of each blade 3 is connected with an external driving motor through a crank, the driving motor receives a control signal of the vehicle control unit 2 and rotates according to the control signal of the vehicle control unit 2, and then the opening degree of each blade 3 is adjusted, so that the cross-sectional area of a flow passage at the turbine end of the supercharger 1 is increased or reduced.
Under the condition of the same exhaust pressure, the sectional area of a flow passage at the turbine end of the supercharger 1 is changed by adjusting the angle of the blade 3, when the opening of the blade 3 is reduced, the sectional area of the flow passage at the turbine end of the supercharger 1 is reduced, the rotating speed of the supercharger is increased, and the supercharging pressure is increased; when the opening of the vane 3 is increased, the sectional area of the flow passage at the turbine end of the supercharger 1 is increased, the rotation speed of the supercharger 1 is reduced, and the supercharging pressure is reduced.
The basic map is obtained by testing the engine on an engine performance bench, in the test, the air inflow is adjusted according to the requirement of the engine torque, and then the required value of the supercharging pressure is calculated according to the required air inflow of the engine, so that the required values of the supercharging pressure corresponding to the engine under different rotating speeds and torques are obtained.
The basic map is stored with the required values of the supercharging pressure of the engine corresponding to different rotating speeds and torques, the basic map is stored in the vehicle control unit 2, and the vehicle control unit 2 queries the basic map according to the real-time rotating speed and the real-time torque of the engine to obtain the current required value P of the supercharging pressure.
The boundary ratio is the maximum ratio of the exhaust pressure value and the supercharging pressure value of the engine; the corresponding boundary ratios at different speeds and torques are stored in the boundary ratio table.
The boundary ratio table is obtained by testing the engine on the engine performance rack, during testing, the engine is tested together with the matched post-processing system and the silencer, and in the whole testing process, particulate matters in the DPF in the post-processing system are in a state of being accumulated to the maximum extent. In the test, the actual intake pressure of the engine is made to reach the required value of the supercharging pressure of the engine as much as possible, the cross section of a flow passage at the turbine end of the supercharger 1 is adjusted through a cross section adjusting device in the test, the rotating speed of the supercharger 1 is controlled not to exceed the maximum rotating speed of the supercharger, and the maximum ratio of the exhaust pressure to the supercharging pressure, namely the boundary ratio, of the engine corresponding to different rotating speeds and torques is measured on the premise that the supercharger 1 does not overspeed. Therefore, when the engine runs at any operating point, if the ratio of the real-time exhaust pressure P2 'to the real-time boost pressure P1' is smaller than the corresponding boundary ratio under the current rotating speed and torque, the rotating speed of the supercharger 1 can be judged to be smaller than the maximum rotating speed; if the ratio of the real-time exhaust pressure P2 'to the real-time boost pressure P1' is equal to the corresponding boundary ratio at the current speed and torque, it may be determined that the supercharger 1 is operating at the maximum speed.
The boundary ratio table stores corresponding boundary ratios of the engine under different rotating speeds and torques, and the vehicle control unit 2 queries the boundary ratio table according to the real-time rotating speed and the real-time torque of the engine to obtain the boundary ratio N under the current rotating speed and the current torque.
The exhaust pressure of the engine is influenced by the sectional area of the runner at the turbine end of the supercharger 1, and is also influenced by the flow resistance of the muffler, the DOC, the DPF and the SCR in the exhaust system, wherein the pressure difference between the two ends of the DOC, the SCR, the muffler, the DOC and the SCR is constant when the exhaust flow is constant, and the pressure difference between the two ends of the DPF changes along with different accumulation conditions of particulate matters in the DPF. Therefore, when testing the boundary ratio P2/P1 of exhaust pressure and boost pressure of the engine under different rotating speeds and torques, the test needs to be carried out under the condition of simulating the state of the maximum accumulation of particulate matters in the DPF, so that the pressure difference between two ends of the DPF in the test is at the maximum value, and the opening degree of the blades 3 in the supercharger 1 reaches the minimum value.
When the engine is in operation, the required supercharging pressure value P of each operating point is constant, and when the required supercharging pressure value P is smaller than the actual supercharging pressure P1', the vehicle control unit 2 controls the sectional area of the flow passage at the turbine end of the supercharger 1 to increase through the actuator 4, the rotating speed of the supercharger 1 is reduced, and the supercharging pressure is reduced.
When the boost pressure requirement value P is greater than the actual boost pressure P1 ', increasing the rotation speed of the supercharger 1 may correspondingly increase the actual boost pressure P1', and due to the characteristics of the supercharger 1 itself, the pressure rise amplitude at the turbine end is greater than the pressure rise amplitude at the compressor end when the rotation speed of the supercharger 1 increases, so that the ratio P2 '/P1' of the real-time exhaust pressure P2 'to the real-time boost pressure P1' also increases during the rotation speed increase of the supercharger 1.
Therefore, when the required value P of the boost pressure is larger than the actual boost pressure P1 ', if the value P2 '/P1 ' is smaller than the boundary ratio of the exhaust pressure value and the boost pressure value of the corresponding engine at the current speed and torque, judging that the supercharger does not overspeed, controlling the sectional area of a flow passage at the turbine end of the supercharger 1 to be reduced by the vehicle controller 2 through the actuator 4, increasing the rotating speed of the supercharger 1, increasing the actual supercharging pressure P1', and the value of P2 '/P1 ' also rises, if the value of P2 '/P1 ' has not reached the boundary ratio N of the exhaust gas pressure value to the boost pressure value of the corresponding engine at the current speed and torque when the actual boost pressure P1 ' has reached the boost pressure demand value P, the whole vehicle controller 2 stops adjusting the sectional area of the turbine end flow passage of the supercharger 1 through the actuator 4, and the engine stably operates under the condition that the actual supercharging pressure P1' is equal to the supercharging pressure required value P;
if the actual boost pressure P1 ' does not reach the boost pressure required value P when the value of P2 '/P1 ' reaches the boundary ratio N between the exhaust pressure value and the boost pressure value of the corresponding engine at the current rotation speed and torque, when the value of P2 '/P1 ' reaches the boundary ratio N, the vehicle control unit 2 determines that the supercharger 1 is in the maximum rotation speed operation, and the vehicle control unit 2 controls the cross-sectional area of the flow passage at the turbine end of the supercharger 1 to be kept unchanged through the actuator 4, so that the supercharger 1 is prevented from overspeeding.
Example 1:
a variable cross-section supercharger overspeed protection control method is based on a variable cross-section supercharger 1, wherein a variable cross-section structure is arranged in the variable cross-section supercharger 1, an actuator 4 is further arranged on the variable cross-section supercharger 1, the output end of the actuator 4 is in transmission fit with the variable cross-section structure, and the control signal input end of the actuator 4 is connected with the supercharger control end of a vehicle control unit 2;
the control method comprises the following steps:
s1, acquiring real-time operation parameters of the engine by the vehicle control unit 2:
the vehicle control unit 2 acquires real-time boost pressure P1 ', real-time exhaust pressure P2', real-time rotating speed and real-time torque of an engine;
the vehicle control unit 2 queries a basic map according to the real-time rotating speed and the real-time torque of the engine to obtain a real-time supercharging pressure demand value P;
the vehicle control unit 2 queries a boundary ratio table according to the real-time rotating speed and the real-time torque of the engine to obtain a boundary ratio N of an exhaust pressure value and a supercharging pressure value of the engine corresponding to the current rotating speed and the current torque;
s2, adjusting the cross section of a flow passage at the turbine end of the supercharger:
after obtaining the engine operating parameters, the vehicle control unit 2 compares the boost pressure demand value P with the real-time boost pressure P1':
if the boost pressure requirement value P is smaller than the real-time boost pressure P1', the vehicle control unit 2 controls the sectional area of the turbine end flow passage of the booster 1 to increase through the actuator 4;
if the boost pressure requirement value P is equal to the real-time boost pressure P1', the sectional area of the flow passage at the turbine end of the supercharger 1 is controlled by the vehicle control unit 2 through the actuator 4 to be kept unchanged;
if the boost pressure demand value P is greater than the real-time boost pressure P1 ', the vehicle control unit 2 calculates a ratio P2 '/P1 ' of the real-time exhaust pressure P2 ' to the real-time boost pressure P1 ', and compares the value of P2 '/P1 ' with N:
a. when the value of P2 '/P1' is equal to the value of N, the vehicle control unit 2 judges that the supercharger 1 is in maximum rotation speed operation, and the vehicle control unit 2 controls the cross-sectional area of a flow passage at the turbine end of the supercharger 1 to be kept unchanged through the actuator 4;
b. when the value P2 '/P1' is smaller than the value N, the vehicle control unit 2 judges that the supercharger 1 does not overspeed, and the vehicle control unit 2 controls the sectional area of a flow passage at the turbine end of the supercharger 1 to be reduced through the actuator 4;
c. when the value of P2 '/P1' is larger than the value of N, the finished vehicle controller reports an error;
the basic map is obtained by testing the engine on an engine performance rack, the basic map comprises the required values of the supercharging pressure of the engine corresponding to different rotating speeds and torques, and the basic map is stored in the vehicle control unit 2;
the boundary ratio table is obtained by testing the engine on an engine performance rack, and comprises corresponding boundary ratios of the engine under different rotating speeds and torques;
the boundary ratio table is stored in the vehicle control unit 2;
in the process of testing an engine on an engine performance rack to obtain a boundary ratio table, the rotating speed of the supercharger 1 is controlled not to exceed the maximum rotating speed by adjusting the sectional area of a turbine end runner of the variable-section supercharger 1;
in the process of testing the engine on the engine performance rack to obtain the boundary ratio table, the engine, the muffler and the engine post-processing system participate in the test together, and particulate matters in the DPF of the engine post-processing system are in a state of being accumulated to the maximum extent in the test process.
Example 2:
example 2 is substantially the same as example 1 except that:
the vehicle control unit 2 acquires real-time supercharging pressure P1' through an air inlet pressure sensor 5, the air inlet pressure sensor 5 is arranged on an air inlet manifold of the engine, and a pressure signal output end of the air inlet pressure sensor 5 is connected with an air inlet pressure signal input end of the vehicle control unit 2;
the finished vehicle controller 2 acquires real-time exhaust pressure P2' through an exhaust pressure sensor 6, the exhaust pressure sensor 6 is arranged on an exhaust manifold of an engine, and a pressure signal output end of the exhaust pressure sensor 6 is connected with an exhaust pressure signal input end of the finished vehicle controller 2;
the supercharger 1 is a variable nozzle turbocharger, the variable cross-section structure is an annular structure formed by a plurality of variable-angle blades 3, a driving ring of each blade 3 is connected with an output end of an actuator 4, and the actuator 4 is a driving motor;
when the opening of the driving motor controlling the blades 3 through the driving ring is increased, the minimum flow cross-sectional area of the turbine end of the supercharger 1 is increased; when the opening of the driving motor controlling the vanes 3 through the driving ring is reduced, the minimum flow cross-sectional area of the turbine end of the supercharger 1 is reduced.
Example 3:
example 3 is substantially the same as example 2 except that:
the frequency of the real-time running parameters of the engine obtained by the vehicle control unit 2 is not more than 1000HZ, and the frequency of the control signals sent by the vehicle control unit 2 to the actuator 4 is not more than 1000 HZ.

Claims (8)

1. A variable cross-section supercharger overspeed protection control method is characterized by comprising the following steps:
the control method is based on a supercharger (1) with a variable cross section, wherein an actuator (4) and a cross section adjusting device are arranged in the supercharger (1), the power output end of the actuator (4) is in transmission fit with the cross section adjusting device, and the control end of the actuator (4) is connected with the supercharger control signal output end of the whole vehicle controller (2);
the control method comprises the following steps:
s1, acquiring real-time operation parameters of the engine by the vehicle control unit (2):
the vehicle control unit (2) acquires real-time boost pressure P1 ', real-time exhaust pressure P2', real-time rotating speed and real-time torque of an engine;
the vehicle control unit (2) queries a basic map according to the real-time rotating speed and the real-time torque of the engine to obtain a real-time supercharging pressure demand value P;
the vehicle control unit (2) queries a boundary ratio table according to the real-time rotating speed and the real-time torque of the engine to obtain a boundary ratio N of an exhaust pressure value and a supercharging pressure value of the engine corresponding to the current rotating speed and the current torque;
s2, adjusting the sectional area of a turbine end flow passage of the supercharger (1):
after the engine operation parameters are obtained, the vehicle control unit (2) compares the boost pressure demand value P with the real-time boost pressure P1':
if the boost pressure requirement value P is smaller than the real-time boost pressure P1', the whole vehicle controller (2) controls the opening of the section adjusting device to increase through the actuator (4), so that the sectional area of a flow passage at the turbine end of the supercharger (1) is increased;
if the boost pressure requirement value P is equal to the real-time boost pressure P1', the whole vehicle controller (2) controls the opening of the section adjusting device to be unchanged through the actuator (4), so that the sectional area of a flow passage at the turbine end of the supercharger (1) is kept unchanged;
if the boost pressure demand value P is greater than the real-time boost pressure P1 ', the vehicle control unit (2) calculates the ratio P2 '/P1 ' of the real-time exhaust pressure P2 ' to the real-time boost pressure P1 ', and compares the value of P2 '/P1 ' with N:
a. when the value of P2 '/P1' is equal to the value of N, the vehicle control unit (2) judges that the supercharger (1) is in the maximum rotating speed operation, the vehicle control unit (2) controls the opening degree of the section adjusting device to be unchanged through the actuator (4), and the sectional area of a flow passage at the turbine end of the supercharger (1) is kept unchanged;
b. when the value P2 '/P1' is smaller than the value N, the vehicle control unit (2) judges that the supercharger (1) does not overspeed, and the vehicle control unit (2) controls the opening degree of the section adjusting device to be reduced through the actuator (4) so as to reduce the sectional area of a flow passage at the turbine end of the supercharger (1);
c. when the value of P2 '/P1' is larger than the value of N, the finished vehicle controller reports an error.
2. The variable-section supercharger overspeed protection control method according to claim 1, characterized by comprising:
the vehicle control unit (2) obtains real-time supercharging pressure P1' through an air inlet pressure sensor (5), the air inlet pressure sensor (5) is arranged on an air inlet manifold of an engine, and a signal output end of the air inlet pressure sensor (5) is connected with an air inlet pressure signal input end of the vehicle control unit (2);
the vehicle control unit (2) obtains real-time exhaust pressure P2' through an exhaust pressure sensor (6), the exhaust pressure sensor (6) is arranged on an exhaust manifold of an engine, and a signal output end of the exhaust pressure sensor (6) is connected with an exhaust pressure signal input end of the vehicle control unit (2).
3. The variable-section supercharger overspeed protection control method according to claim 2, characterized in that:
the basic map is obtained by testing the engine on an engine performance bench, the basic map comprises corresponding supercharging pressure required values of the engine under different rotating speeds and torques, and the basic map is stored in the vehicle control unit (2).
4. The variable-section supercharger overspeed protection control method according to any one of claims 1 to 3, characterized by comprising:
the boundary ratio table is obtained by testing the engine on an engine performance rack, and comprises corresponding boundary ratios of the engine under different rotating speeds and torques;
the boundary ratio table is stored in the vehicle control unit (2).
5. The variable-section supercharger overspeed protection control method according to claim 4, characterized in that:
in the process of testing an engine on an engine performance rack to obtain a boundary ratio table, the rotating speed of the supercharger (1) is controlled not to exceed the maximum rotating speed by adjusting the sectional area of a turbine end flow passage of the variable-section supercharger (1).
6. The variable-section supercharger overspeed protection control method according to claim 5, characterized in that:
in the process of testing the engine on the engine performance rack to obtain the boundary ratio table, the engine, the muffler and the engine post-processing system participate in the test together, and particulate matters in the DPF of the engine post-processing system are in a state of being accumulated to the maximum extent in the test process.
7. The variable-section supercharger overspeed protection control method according to claim 6, characterized in that:
the frequency of the real-time running parameters of the engine obtained by the vehicle control unit (2) is not more than 1000HZ, and the frequency of the control signals sent by the vehicle control unit (2) to the actuator (4) is not more than 1000 HZ.
8. The variable-section supercharger overspeed protection control method according to claim 7, characterized in that:
the turbocharger (1) is a variable nozzle turbocharger, the section adjusting device is an annular structure formed by a plurality of variable-angle blades (3), a driving ring of each blade (3) is in transmission fit with a power output end of an actuator (4), and the actuator (4) is a driving motor;
the opening of the driving motor is controlled by driving the ring to increase, so that the sectional area of a flow passage at the turbine end of the supercharger (1) is increased; the opening of the driving motor through the driving ring control blade (3) is reduced, and then the sectional area of a flow passage at the turbine end of the supercharger (1) is reduced.
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Citations (4)

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Publication number Priority date Publication date Assignee Title
JP2003120353A (en) * 2001-10-12 2003-04-23 Nissan Motor Co Ltd Supercharging pressure control device for internal combustion engine
CN105649759A (en) * 2014-11-12 2016-06-08 联创汽车电子有限公司 Protection system for turbocharger
CN105927408A (en) * 2015-02-27 2016-09-07 丰田自动车株式会社 Control apparatus and control method for internal combustion engine
CN110295993A (en) * 2019-06-27 2019-10-01 浙江吉利控股集团有限公司 A kind of adjustable turbocharger of inlet air flow and its control method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE539033C2 (en) * 2013-04-30 2017-03-21 Scania Cv Ab Procedure and system for control of turbocharged engine during shifting

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003120353A (en) * 2001-10-12 2003-04-23 Nissan Motor Co Ltd Supercharging pressure control device for internal combustion engine
CN105649759A (en) * 2014-11-12 2016-06-08 联创汽车电子有限公司 Protection system for turbocharger
CN105927408A (en) * 2015-02-27 2016-09-07 丰田自动车株式会社 Control apparatus and control method for internal combustion engine
CN110295993A (en) * 2019-06-27 2019-10-01 浙江吉利控股集团有限公司 A kind of adjustable turbocharger of inlet air flow and its control method

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