CN108501941B

CN108501941B - Engine starting method, device and system

Info

Publication number: CN108501941B
Application number: CN201810274813.8A
Authority: CN
Inventors: 冯擎峰
Original assignee: Zhejiang Geely Holding Group Co Ltd; Geely Automobile Research Institute Ningbo Co Ltd
Current assignee: Zhejiang Geely Holding Group Co Ltd; Geely Automobile Research Institute Ningbo Co Ltd
Priority date: 2018-03-29
Filing date: 2018-03-29
Publication date: 2020-07-07
Anticipated expiration: 2038-03-29
Also published as: CN108501941A

Abstract

The invention provides an engine starting method, device and system, relating to the technical field of automobiles, wherein the method comprises the following steps: monitoring whether an engine starting signal is received or not in the process of stopping the engine of the current vehicle; if yes, sending control parameters to a motor controller to trigger the motor to deliver starting torque to the engine; acquiring the rotating speed of an engine in the process of transmitting starting torque by a motor; judging whether the rotating speed is greater than a preset rotating speed threshold value or not; if so, triggering the engine to enter a starting procedure. The engine starting method, the engine starting device and the engine starting system can trigger the motor to transmit starting torque to the engine, realize torque compensation and rotation speed synchronization, enable a driver to quickly recover power driving after stepping on an accelerator, greatly shorten the starting time of the engine, reduce power response delay and simultaneously contribute to improving the experience degree of the driver.

Description

Engine starting method, device and system

Technical Field

The invention relates to the technical field of automobiles, in particular to an engine starting method, device and system.

Background

After a driver looses an accelerator pedal, a transmission chain of a traditional fuel vehicle is kept in a combined state, an engine enters a fuel cut-off state, and the vehicle enters a sliding state. Therefore, the engine start-stop function is often adopted to improve the above-described problems.

In the prior art, the start-stop function of an engine is mainly that when a vehicle slides at a high speed, an engine controller requests a gearbox to open a clutch and stop the engine under the condition that both driving conditions and vehicle conditions are met, so that the sliding distance is longer to save fuel; when the driving condition or the vehicle condition is not satisfied, the engine is started to recover the power, however, the process of starting the engine has great defects, so that the conventional fuel vehicle on the market does not have the high-speed engine start-stop function. Moreover, if the intention of the driver is changed in the process of stopping the engine, the driver needs to wait for the engine to stop when the engine needs to be started to drive, and then the engine needs to be restarted, so that the intention of the driver is violated, and great safety risk exists, so that the starting and stopping of the traditional fuel vehicle at a high speed cannot be realized, and the experience of the driver is reduced.

Disclosure of Invention

In view of the above, the present invention provides an engine starting method, apparatus and system to alleviate the technical problem that the start and stop of the engine cannot be realized under high vehicle speed.

In a first aspect, an embodiment of the present invention provides an engine starting method, which is applied to an engine controller of a hybrid electric vehicle, where an engine control system of the hybrid electric vehicle is configured with a motor auxiliary system, and a motor controller of the motor auxiliary system is in communication connection with the engine controller; the method comprises the following steps: monitoring whether an engine starting signal is received or not in the process of stopping the engine of the current vehicle; if yes, sending control parameters to a motor controller to trigger the motor to deliver starting torque to the engine; the control parameters comprise starting torque and a torque rising slope corresponding to the starting torque; acquiring the rotating speed of an engine in the process of transmitting starting torque by a motor; judging whether the rotating speed is greater than a preset rotating speed threshold value or not; if so, triggering the engine to enter a starting procedure.

With reference to the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, where after the engine enters a starting procedure, the method further includes: acquiring engine torque of an engine and target torque of a gearbox in a starting process; wherein the engine torque is the engine clutch end torque; judging whether the engine torque is matched with the target torque or not; if yes, triggering the gearbox to perform press fit; if not, the process of delivering starting torque by the motor is maintained.

With reference to the first aspect, an embodiment of the present invention provides a second possible implementation manner of the first aspect, where the method further includes: monitoring the running state of the current vehicle when the current vehicle runs normally; judging whether the current running state of the vehicle meets the engine stop condition; if so, triggering the engine to enter a shutdown process.

With reference to the second possible implementation manner of the first aspect, the embodiment of the present invention provides a third possible implementation manner of the first aspect, wherein the operation state of the engine includes one or more of the following: the driving conditions of the current vehicle comprise the speed and the gear signal of the current vehicle; the driving condition of the current vehicle at least comprises the following working conditions: the gradient of a current vehicle running road, the capacity of a battery included in the motor auxiliary system, the peak discharge power of the battery and the peak torque of the motor; the allowable state of the gearbox under the driving working condition; the permission state includes whether the clutch is permitted to be opened; the step of determining whether the current operating state of the vehicle satisfies the engine stop condition includes: and judging whether the running states of the current vehicle meet the engine stop condition, and if so, determining that the running states of the current vehicle meet the engine stop condition.

With reference to the third possible implementation manner of the first aspect, the example embodiment of the present invention provides a fourth possible implementation manner of the first aspect, where after determining that the current operating state of the vehicle satisfies the engine stop condition, the method further includes: monitoring whether a signal of completing the opening of the clutch is received within a preset time threshold value; if yes, triggering the engine to enter a shutdown program; if not, clutch failure information is generated.

With reference to the third possible implementation manner of the first aspect, the embodiment of the present invention provides a fifth possible implementation manner of the first aspect, wherein after determining that the current operating state of the vehicle meets the engine stop condition, the method further includes: and sending a stop auxiliary signal to the motor controller to trigger the motor to send negative torque to the engine so as to assist the engine to stop.

With reference to the fifth possible implementation manner of the first aspect, an embodiment of the present invention provides a sixth possible implementation manner of the first aspect, where the method further includes: monitoring the rotating speed of the engine in the stopping process; judging whether the rotating speed is lower than a preset minimum rotating speed or not; if yes, controlling the engine to enter an automatic stop state; if not, the engine shutdown process is maintained.

In a second aspect, an embodiment of the present invention further provides an engine starting apparatus, which is disposed in an engine controller of a hybrid electric vehicle, where an engine control system of the hybrid electric vehicle is configured with a motor auxiliary system, and a motor controller of the motor auxiliary system is in communication connection with the engine controller, and the apparatus includes: the monitoring module is used for monitoring whether an engine starting signal is received or not in the process of stopping the engine of the current vehicle; the sending module is used for sending control parameters to the motor controller when the monitoring module monitors an engine starting signal so as to trigger the motor to transmit starting torque to the engine; the control parameters comprise starting torque and a torque rising slope corresponding to the starting torque; the first acquisition module is used for acquiring the rotating speed of the engine in the process of conveying starting torque by the motor; the first judgment module is used for judging whether the rotating speed is greater than a preset rotating speed threshold value; and the starting module is used for triggering the engine to enter a starting program when the judgment result of the first judgment module is yes.

With reference to the second aspect, an embodiment of the present invention provides a first possible implementation manner of the second aspect, where the apparatus further includes: the second acquisition module is used for acquiring the engine torque and the target torque of the gearbox in the starting process of the engine after the engine enters a starting program; wherein the engine torque is the engine clutch end torque; the second judgment module is used for judging whether the engine torque is matched with the target torque or not; the signal sending module is used for triggering the gearbox to carry out pressing when the judgment result of the second judgment module is yes; and the maintaining module is used for maintaining the process of transmitting the starting torque by the motor when the judgment result of the second judging module is negative.

In a third aspect, the embodiment of the present invention further provides an engine starting system, which includes an engine controller, and an engine control system connected to the engine controller; the engine control system comprises an engine system and a motor auxiliary system; the motor controllers of the motor auxiliary systems are in communication connection with the engine controller; the motor of the motor auxiliary system is in transmission connection with an engine crankshaft of the engine system through a belt and a belt wheel. The engine controller comprises a memory for storing a program supporting the processor to perform the method of the first aspect and a processor configured to execute the program stored in the memory.

In a fourth aspect, an embodiment of the present invention further provides a computer storage medium for storing computer software instructions for the apparatus in the second aspect.

The embodiment of the invention has the following beneficial effects:

the engine starting method, the engine starting device and the engine starting system provided by the embodiment of the invention can monitor whether an engine starting signal is received or not when an engine of a current vehicle is stopped, and if so, the control parameter can be sent to the motor controller to further trigger the motor to transmit starting torque to the engine, so that torque compensation and rotation speed synchronization are realized, and when the rotation speed exceeds a preset rotation speed threshold value, the engine is triggered to enter a starting program, so that a driver can quickly recover power running after stepping on an accelerator, the starting time of the engine is greatly shortened, the power response delay is reduced, and meanwhile, the experience degree of the driver is also improved.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a flow chart of an engine starting method provided by an embodiment of the present invention;

FIG. 2 is a flow chart of another engine starting method provided by an embodiment of the present invention;

fig. 3 is a schematic structural diagram of an engine starting apparatus according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of another engine starting apparatus provided in accordance with an embodiment of the present invention;

fig. 5 is a block diagram of an engine starting system according to an embodiment of the present invention.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

After a driver looses an accelerator pedal, a transmission chain of a traditional fuel vehicle is kept in a combined state, an engine enters a fuel cut-off state, and the vehicle enters a sliding state.

In order to solve the above problems, a start-stop function is generally applied when the vehicle is coasting at a high speed, that is, when the driving condition and the vehicle condition are satisfied, the engine controller requests the transmission to open the clutch and stop the engine, so that the coasting distance is further increased to save fuel; when the driving condition or the vehicle condition is not satisfied, the engine is started to recover the power.

Generally, two starting modes of the engine are generally adopted according to different vehicle speeds, when the vehicle speed is higher, the engine is started by controlling the clutch to be in sliding friction, namely, the combination of a transmission chain is controlled by controlling the clutch, and the engine is dragged to start by means of the kinetic energy of the vehicle; when the vehicle speed is low, the engine is generally started by the starter, and after the engine is started, the clutch is controlled to enable the transmission chain to be connected.

However, the conventional fuel vehicles on the market do not have such high-speed start-stop applications due to the great defects of the two starting modes. For example, in the process of sliding of the engine-stopped vehicle, if a driver steps on an accelerator suddenly, the vehicle represents that the power running needs to be recovered immediately, if the clutch is used for sliding starting, part of the kinetic energy of the vehicle needs to be consumed by dragging the engine backwards, so that the vehicle does not accelerate but continues to decelerate for a period of time after the driver steps on the accelerator suddenly; if the starter is used for starting, the rotating speed dragged by the starter is very low, the engine needs to be started for a long time successfully, the engine needs to respond to a torque request of a driver or a gearbox by adjusting a throttle valve after the starting is finished, the rotating speed is increased, the gearbox is pressed on a clutch to restore the power of the vehicle when the rotating speed is synchronous, and the vehicle does not reflect the acceleration requirement of the driver all the time in the process.

In addition, if the driver changes the intention to start the engine to drive in the process of stopping the engine, the driver must wait until the engine is stopped and then start the engine by the starter, and the intention of the driver is also violated, so that the conditions have great safety risks, and the high-speed start-stop of the traditional fuel vehicle cannot be realized.

Based on the above, the embodiment of the invention provides an engine starting method, device and system, which can realize high-speed start and stop by starting the engine with the motor assistance when detecting that a driver needs to start the engine after the engine is completely stopped or in the stopping process.

To facilitate understanding of the present embodiment, a detailed description will be given of an engine starting method disclosed in the present embodiment.

The first embodiment is as follows:

the embodiment of the invention provides an engine starting method which can be applied to an engine controller of a hybrid electric vehicle, and in the concrete implementation, an engine control system of the hybrid electric vehicle is provided with a motor auxiliary system, and a motor controller of the motor auxiliary system is in communication connection with the engine controller; .

Specifically, the motor assist system may be installed at a crankshaft position of a conventional engine, and may generally include a motor controller, a motor, and a battery for supplying power to the motor. Generally, the motor can be a BSG (Belt driven starter Generator) motor based on a BSG technology, specifically, the BSG technology belongs to a weak hybrid technology, and is a hybrid technology with idle stop and start functions, which can realize that an engine of an automobile stops working before a red light and in a traffic jam, and when the automobile recognizes that a driver has a starting intention, the engine is quickly started through a BSG system, so that oil consumption, emission and noise of the engine in idle working are eliminated, the automobile displacement is reduced, and further, the oil consumption is saved and the emission of carbon dioxide is reduced.

Further, the battery is usually a 48V battery, and is used in combination with a BSG motor, which is connected to the engine crankshaft via a belt and a pulley.

In this regard, embodiments of the present invention provide an engine starting method, such as the flowchart of an engine starting method shown in fig. 1, comprising the steps of:

step S102, monitoring whether an engine starting signal is received or not in the process of stopping the engine of the current vehicle;

in the specific implementation, the engine starting signal is obtained after a driver triggers an engine starting operation in the engine stopping process, and can be obtained by monitoring an accelerator pedal signal and a brake pedal signal or whether the driver switches a driving mode or not.

Step S104, if yes, sending control parameters to a motor controller to trigger a motor to deliver starting torque to the engine;

the control parameters comprise starting torque and a torque rising slope corresponding to the starting torque;

during specific implementation, the control parameter can be obtained in a test calibration mode, specifically, the starting torque of the motor can be set according to different engine rotating speeds and engine water temperatures, and a corresponding torque rising slope is set. The specific test calibration manner may refer to relevant data in the prior art, which is not limited in this embodiment of the present invention.

After the motor controller receives the control parameters, the motor controller can start the motor to run according to the control parameters, and further transmit starting torque to the engine to assist the engine to start.

Step S106, acquiring the rotating speed of the engine in the process of transmitting the starting torque by the motor;

step S108, judging whether the rotating speed is greater than a preset rotating speed threshold value;

and step S110, if yes, triggering the engine to enter a starting procedure.

The rotation speed threshold may be set according to actual use conditions, and the embodiment of the present invention is not limited to this.

In specific implementation, the engine controller can control an oil injector and an ignition coil of the engine to inject oil and ignite, and then the starting procedure is started.

Usually, the engine start can be triggered both during the engine stop and during a complete engine stop, which ensures that the driver's start demand is immediately available. Accordingly, the method further comprises monitoring the rotational speed during the engine shutdown; and judging whether the rotating speed is lower than a preset minimum rotating speed or not, such as the rotating speed is zero. If yes, controlling the engine to enter an automatic stop state; if not, the engine shutdown process is maintained.

In order to ensure that the engine can be successfully started through the BSG motor at any time after being stopped, and prevent the problem that the engine cannot be normally started or the starting is slow to influence the driving safety, the engine starting method provided by the embodiment of the invention further comprises a process of judging whether the engine stopping condition is met, wherein the process is usually carried out when the current vehicle normally runs. Based on this, the embodiment of the present invention further provides another engine starting method, such as a flowchart of another engine starting method shown in fig. 2, which includes the following steps:

step S202, monitoring the running state of the current vehicle when the current vehicle runs normally;

specifically, the operating state of the engine may include one or more of the following:

(1) the driving conditions of the current vehicle comprise the speed and the gear signal of the current vehicle;

(2) the driving condition of the current vehicle at least comprises the following working conditions: the gradient of a current vehicle running road, the capacity of a battery included in the motor auxiliary system, the peak discharge power of the battery and the peak torque of the motor;

(3) the allowable state of the gearbox under the driving working condition; the permission state includes whether the clutch is permitted to be opened;

step S204, judging whether the running state of the current vehicle meets the engine stop condition, if so, executing step S206; if not, executing step S208;

based on one or more operation states included in the step S202, the step S204 can be summarized as: and judging whether the running states of the current vehicle meet the engine stop condition, and if so, determining that the running states of the current vehicle meet the engine stop condition.

When the method is actually used, the checking of the driving condition of the current vehicle mainly means that the vehicle speed is within a certain range, the range can be obtained in a test calibration mode, a driver releases an accelerator pedal and a brake pedal at the same time, the gear is above a certain threshold value and is in a specific driving mode, if the condition is met, the checking of the driving working condition of the current vehicle is continued, and if the condition is not met, the vehicle is kept in a normal driving state;

further, the driving condition of the vehicle is checked, mainly that the road gradient is within a certain threshold, the capacity of the battery, for example, the SOC (State of Charge) of the 48V battery is higher than the threshold, the peak discharge power of the 48V battery is higher than the threshold, the peak torque of the BSG is higher than the threshold, and an ESP (Electronic Stability Program) is not in operation, and these conditions mainly aim to ensure that the engine can be successfully started by the BSG motor at any time after the engine is stopped, and prevent the occurrence of conditions that the engine cannot be normally started or is slowly started to affect the driving safety. If the conditions are met, continuously checking whether the gearbox allows to open the clutch, and if not, continuously keeping the vehicle in a normal running state.

Step S206, triggering the engine to enter a shutdown program;

in particular implementations, the engine controller may send a shutdown request to the engine to trigger the engine to enter a shutdown sequence. Meanwhile, in order to ensure that the clutch can be normally opened to cut off the transmission chain in the running process of the vehicle, after the current running state of the vehicle is determined to meet the engine stop condition, the method further comprises the following steps: monitoring whether a signal of completing the opening of the clutch is received within a preset time threshold value; if yes, triggering the engine to enter a shutdown program; if not, clutch failure information is generated.

During specific implementation, whether the opening time of the clutch exceeds a time threshold value or not can be monitored through the engine controller, the opening of the clutch can be completed through monitoring signals, a fault is reported when the clutch is not completely opened within a certain time, after the fault is reported, a request for opening the clutch is closed, the vehicle recovers to run normally, and the driving cycle does not judge that the motor enters a state of assisting the engine to stop at a high speed.

Generally, during the engine stopping process, the fuel injection of the engine is mainly forbidden, the engine is stopped stably by means of the back-dragging torque of the engine and the rotating speed control of the BSG motor, and the rotating speed of the engine is reduced in a certain gradient. Accordingly, the above method further comprises: the method comprises the steps of sending a stop auxiliary signal to a motor controller, triggering a motor to send negative torque to an engine to assist the engine to stop, and enabling the motor to convey the negative torque to the engine to assist the stop in the current vehicle stop process depending on the drag torque of the engine.

Step S208, keeping the normal running state of the current vehicle; end up

Step S210, monitoring whether an engine starting signal is received or not in the process of stopping the engine of the current vehicle; if yes, go to step S212; if not, returning to continue to execute the step S210;

during specific implementation, the engine starting signal is request information sent by a driver, and whether the driver requests to start the engine is judged, wherein the engine starting signal mainly comprises steps of stepping on an accelerator pedal, stepping on a brake pedal, switching to other driving modes and the like; the vehicle conditions mainly comprise that the SOC of the 12v battery is lower than a threshold value, and the voltage of the 12v battery is lower than the threshold value, and the conditions mainly prevent the 12v battery from being not charged during the vehicle sliding process to cause power feeding; in addition, the conditions that the vehicle is on a large slope, the ESP is in operation, the SOC of the 48v battery is smaller than a certain threshold value and the like mainly aim to ensure driving safety.

Step S212, sending control parameters to a motor controller to trigger a motor to deliver starting torque to an engine;

step S214, acquiring the rotating speed of the engine in the process of transmitting starting torque by the motor;

step S216, judging whether the rotating speed is greater than a preset rotating speed threshold value; if yes, go to step S218; if not, returning to step S214;

step S218, triggering the engine to enter a starting procedure;

step S220, obtaining the engine torque of the engine and the target torque of the gearbox in the starting process;

wherein the engine torque is an engine clutch end torque, also referred to as a net torque of the engine.

Step S222, judging whether the engine torque is matched with the target torque; if yes, go to step S226; if not, go to step S224;

step S224, keeping the process that the motor transmits the starting torque; and returns to step S220;

and step S226, triggering the gearbox to perform press fit.

Specifically, the gearbox can detect the torque of the engine and the target torque of the gearbox, and compares the torque of the engine with the target torque of the gearbox to control whether the pressing is needed or not, and meanwhile, factors such as the rotating speed synchronization of the engine and the input shaft of the gearbox are considered.

Further, the above-mentioned step S222 is mainly to check whether the current engine torque can meet the torque requirement of the transmission, and if so, the transmission controls the press-fit clutch; if not, the torque of the engine is compensated through the BSG motor, so that the torque of the BSG motor plus the torque of the engine can quickly respond to the torque requirement of the gearbox.

In the embodiment of the invention, the motor control system is provided with a motor auxiliary system, so that the torque of the engine can be assisted or compensated through the motor, the requirement of a gearbox can be quickly met, and the gearbox can be further quickly pressed on the clutch.

In summary, the engine starting method provided by the embodiment of the present invention includes that after the engine is completely stopped or in the stopping process, if it is detected that the driver or the vehicle condition needs to start the engine, the engine is immediately started by the motor of the motor auxiliary system, and the torque of the engine is rapidly compensated by the motor to meet the torque requirement of the transmission, and the rotation speed synchronization with the transmission is realized, so that the transmission can rapidly press the clutch to resume driving. Because the clutch is not used for sliding and starting, the situation that the vehicle is decelerated when the driver steps on the accelerator does not exist; because the time for starting the engine by the motor is obviously shorter than the starting time of the starter, and the torque compensation and the rotation speed synchronization can be realized by the motor after the engine is started, the power driving can be quickly recovered after a driver steps on an accelerator; the engine does not need to be restarted after the engine is stopped, so that the starting time of the engine can be greatly shortened, and the power response delay is reduced.

The engine starting method provided by the embodiment of the invention can monitor whether an engine starting signal is received or not when the current vehicle stops the engine, and if so, the control parameter can be sent to the motor controller to trigger the motor to transmit the starting torque to the engine, so that the torque compensation and the rotating speed synchronization are realized, and when the rotating speed exceeds a preset rotating speed threshold value, an ignition signal is sent to the engine controller to trigger the engine to enter a starting program, so that a driver can quickly recover the power running after stepping on an accelerator, the starting time of the engine is greatly shortened, the power response delay is reduced, and meanwhile, the experience degree of the driver is also improved.

Example two:

on the basis of the above embodiments, an embodiment of the present invention further provides an engine starting apparatus, which is disposed in an engine controller of a hybrid electric vehicle, an engine control system of the hybrid electric vehicle is configured with a motor auxiliary system, and a motor controller of the motor auxiliary system is in communication connection with the engine controller, as shown in fig. 3, the apparatus includes:

the monitoring module 30 is used for monitoring whether an engine starting signal is received or not in the process of stopping the engine of the current vehicle;

a sending module 32, configured to send a control parameter to the motor controller when the monitoring module monitors an engine start signal, so as to trigger the motor to deliver a start torque to the engine; the control parameters comprise starting torque and a torque rising slope corresponding to the starting torque;

the first obtaining module 34 is used for obtaining the rotating speed of the engine in the process of conveying the starting torque by the motor;

the first judging module 36 is configured to judge whether the rotation speed is greater than a preset rotation speed threshold;

and the starting module 38 is used for triggering the engine to enter a starting procedure when the judgment result of the first judgment module is yes.

Further, as shown in fig. 4, another schematic structural diagram of the engine starting apparatus includes, in addition to the structure shown in fig. 3:

the second obtaining module 40 is used for obtaining the engine torque and the target torque of the gearbox in the starting process of the engine after the engine enters a starting procedure; wherein the engine torque is the engine clutch end torque;

a second determination module 42 for determining whether the engine torque matches the target torque;

the signal sending module 44 is used for triggering the gearbox to perform stitching when the judgment result of the second judgment module is yes;

and the maintaining module 46 is used for maintaining the process of transmitting the starting torque by the motor when the judgment result of the second judging module is negative.

The engine starting device provided by the embodiment of the invention has the same technical characteristics as the engine starting method provided by the embodiment, so that the same technical problems can be solved, and the same technical effects can be achieved.

Further, an embodiment of the present invention also provides an engine starting system, such as a block diagram of an engine starting system shown in fig. 5, which includes an engine controller 50 and an engine control system 52 connected to the engine controller 50.

The engine control system includes an engine system 521 and a motor assist system 522; the motor controller of the motor auxiliary system is in communication connection with the engine controller; the motor of the motor auxiliary system is in transmission connection with an engine crankshaft of the engine system through a belt and a belt wheel.

Further, the engine controller includes a memory for storing a program that supports the processor to perform the method of one of the above embodiments and a processor configured to execute the program stored in the memory.

The computer program product of the engine starting method, the engine starting device and the engine starting system provided by the embodiment of the invention comprises a computer readable storage medium storing program codes, wherein instructions included in the program codes can be used for executing the method described in the previous method embodiment, and specific implementation can refer to the method embodiment, which is not described herein again.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the system and the apparatus described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that the following embodiments are merely illustrative of the present invention, and not restrictive, and the scope of the present invention is not limited thereto: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An engine starting method is characterized by being applied to an engine controller of a hybrid electric vehicle, wherein an engine control system of the hybrid electric vehicle is provided with a motor auxiliary system, and a motor controller of the motor auxiliary system is in communication connection with the engine controller; the method comprises the following steps:

monitoring whether an engine starting signal is received or not in the process of stopping the engine of the current vehicle;

if yes, sending control parameters to the motor controller to trigger the motor to deliver starting torque to the engine; wherein the control parameter comprises the starting torque and a torque rising slope corresponding to the starting torque;

acquiring the rotating speed of the engine in the process of conveying the starting torque by the motor;

judging whether the rotating speed is greater than a preset rotating speed threshold value or not;

if yes, triggering the engine to enter a starting procedure;

after the engine enters a start-up sequence, the method further comprises:

acquiring engine torque of the engine in a starting process and target torque of a gearbox; wherein the engine torque is an engine clutch end torque;

judging whether the engine torque is matched with the target torque or not;

if yes, triggering the gearbox to perform press fit;

if not, the process of delivering the starting torque by the motor is maintained.

2. The method of claim 1, further comprising:

monitoring the running state of the current vehicle when the current vehicle runs normally;

judging whether the running state of the current vehicle meets the engine stop condition or not;

if so, triggering the engine to enter a shutdown process.

3. The method of claim 2, wherein the operating state of the engine comprises one or more of:

the driving conditions of the current vehicle comprise the vehicle speed and the gear signal of the current vehicle;

the running condition of the current vehicle at least comprises the following steps: a grade of a road on which the current vehicle is traveling, a capacity of a battery included in the motor assist system, a peak discharge power of the battery, and a peak torque of the motor;

the allowable state of the gearbox under the running working condition; the permission state includes whether the clutch is permitted to be opened;

the step of judging whether the running state of the current vehicle meets the engine stop condition comprises the following steps:

and judging whether the running states of the current vehicle meet the engine stop condition, and if so, determining that the running states of the current vehicle meet the engine stop condition.

4. The method of claim 3, wherein after determining that the current vehicle operating state satisfies an engine shut-down condition, the method further comprises:

monitoring whether a signal of completing the opening of the clutch is received within a preset time threshold value;

if yes, triggering the engine to enter a shutdown program;

if not, clutch failure information is generated.

5. The method of claim 3, wherein upon determining that the current vehicle operating state satisfies an engine shut-down condition, the method further comprises:

and sending a stop auxiliary signal to the motor controller to trigger the motor to send negative torque to the engine so as to assist the engine to stop.

6. The method of claim 5, further comprising:

monitoring the rotating speed of the engine during the shutdown process;

judging whether the rotating speed is lower than a preset lowest rotating speed or not;

if yes, controlling the engine to enter an automatic stop state;

if not, the engine shutdown process is maintained.

7. An engine starting device is characterized in that the device is arranged on an engine controller of a hybrid electric vehicle, an engine control system of the hybrid electric vehicle is provided with a motor auxiliary system, and a motor controller of the motor auxiliary system is in communication connection with the engine controller; the device comprises:

the monitoring module is used for monitoring whether an engine starting signal is received or not in the process of stopping the engine of the current vehicle;

the sending module is used for sending control parameters to the motor controller when the monitoring module monitors the engine starting signal so as to trigger the motor to deliver starting torque to the engine; wherein the control parameter comprises the starting torque and a torque rising slope corresponding to the starting torque;

the first acquisition module is used for acquiring the rotating speed of the engine in the process that the motor transmits the starting torque;

the first judgment module is used for judging whether the rotating speed is greater than a preset rotating speed threshold value;

the starting module is used for triggering the engine to enter a starting program when the judgment result of the first judgment module is yes;

the device further comprises:

the second acquisition module is used for acquiring the engine torque and the target torque of the gearbox in the starting process of the engine after the engine enters a starting program; wherein the engine torque is an engine clutch end torque;

the second judgment module is used for judging whether the engine torque is matched with the target torque or not;

the signal sending module is used for triggering the gearbox to carry out pressing when the judgment result of the second judgment module is yes;

and the maintaining module is used for maintaining the process of conveying the starting torque by the motor when the judgment result of the second judging module is negative.

8. An engine starting system, comprising an engine controller, and an engine control system connected to the engine controller;

the engine control system comprises an engine system and a motor auxiliary system; the motor controller of the motor auxiliary system is in communication connection with the engine controller;

the motor of the motor auxiliary system is in transmission connection with an engine crankshaft of the engine system through a belt and a belt wheel;

the engine controller comprises a memory for storing a program that supports a processor to perform the method of any one of claims 1 to 6, and a processor configured to execute the program stored in the memory.