CN114940160A - Control method and control system for dynamic stop and variable-idea starting of vehicle engine and hybrid electric vehicle - Google Patents

Control method and control system for dynamic stop and variable-idea starting of vehicle engine and hybrid electric vehicle Download PDF

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Publication number
CN114940160A
CN114940160A CN202210597536.0A CN202210597536A CN114940160A CN 114940160 A CN114940160 A CN 114940160A CN 202210597536 A CN202210597536 A CN 202210597536A CN 114940160 A CN114940160 A CN 114940160A
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China
Prior art keywords
engine
idea
vehicle
dynamic stop
pcu
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Pending
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CN202210597536.0A
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Chinese (zh)
Inventor
张猛
聂相虹
刘斌
叶明辉
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Chongqing Changan Automobile Co Ltd
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Chongqing Changan Automobile Co Ltd
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Priority to CN202210597536.0A priority Critical patent/CN114940160A/en
Publication of CN114940160A publication Critical patent/CN114940160A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W20/00—Control systems specially adapted for hybrid vehicles
    • B60W20/10—Controlling the power contribution of each of the prime movers to meet required power demand
    • B60W20/15—Control strategies specially adapted for achieving a particular effect
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/06—Combustion engines, Gas turbines
    • B60W2710/0644—Engine speed
    • 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
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/62—Hybrid vehicles

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

The invention protects a vehicle engine dynamic stop and variable idea start control method, the method is in the driving process, if the engine is monitored to be dynamically stopped, in the engine dynamic stop process, the engine speed is controlled to maintain stable in short time, and then the engine is completely stopped; if the engine rotation speed is stabilized in a short time and the requirement of the engine is met, the engine is directly controlled to recover the normal oil injection ignition, and the variable-idea starting is realized. The invention is used for carrying a hybrid electric vehicle with a double-motor series-parallel configuration, can shorten the time for changing the dynamic shutdown stage of the engine into the idea to restart the engine and improves the dynamic response characteristic.

Description

Control method and control system for dynamic stop and variable-idea starting of vehicle engine and hybrid electric vehicle
Technical Field
The invention belongs to the control technology in the field of automobile power, and particularly relates to a starting technology in the dynamic shutdown process of an engine of a hybrid electric vehicle.
Background
When the hybrid electric vehicle with the series-parallel configuration is subjected to dynamic engine stop in the driving process and is subjected to variable-idea starting in the stop process, the scheme adopted at present is to control the engine to cut off fuel and extinguish after the series-parallel clutch is disconnected, so that the aim of dynamic engine stop is fulfilled. When the variable-idea starting is carried out in the dynamic stopping process, if the rotating speed of the engine is higher, the variable-idea starting purpose is achieved by recovering oil supply; if the engine speed is low, the starting process is restarted, the engine is dragged to reach the starting speed through the generator, and the engine is controlled to inject oil and ignite, so that the purpose of starting the engine is achieved.
In the prior art, the engine is started in a variable idea mode in the dynamic stop process, if the rotating speed of the engine is low, the starting process is restarted, and after the engine is dragged to reach the starting rotating speed through a motor, the engine is controlled to inject oil and ignite, so that the purpose of starting the engine is achieved. The whole starting process is long in time and cannot better meet the rapid response intention of a driver.
Chinese patent document CN106184197A discloses "a method and a system for controlling idling stop and a hybrid vehicle", which mainly aims at a control method for controlling idling stop of an engine and variable-idea start of the engine in a static phase after a vehicle is stopped stably, and aims at shortening the time for restarting the engine in an idling stop state.
Disclosure of Invention
The invention provides a coordination control method for dynamic stop and variable-idea starting of a vehicle engine, and provides coordination control for the stop and the variable-idea restarting of the engine by adopting a motor and the engine in the running process, and the coordination control between the motor and the engine is fully utilized, so that the method aims to shorten the time for the dynamic stop stage of the engine and the variable-idea restarting of the engine and improve the dynamic response characteristic.
The technical scheme of the invention is as follows:
a method for controlling dynamic stop and variable idea start of vehicle engine includes using PCU as control unit of whole vehicle power assembly to take charge of coordinating control of dynamic stop and variable idea start process in running course.
In the method, a PCU monitors if the engine is dynamically stopped in the driving process, and controls the rotating speed of the engine to maintain stable for a short time in the dynamic stopping process of the engine, and then the engine is completely stopped; if the engine rotation speed is stabilized in a short time and the requirement of the engine is met, the engine is directly controlled to recover the normal oil injection ignition, and the variable-idea starting is realized.
Preferably, the method for controlling the engine speed to maintain the short-time stability and then completely stop the engine is as follows: after the PCU judges that the engine finishes oil cut, an engine rotating speed stabilizing command is sent, and the rotating speed of the engine is stabilized at a certain rotating speed through the output torque of the motor 1 and continues for a certain time.
Preferably, the method of directly controlling the engine to resume normal fuel injection ignition when there is a need to variably intentionally start the engine is: when the PCU detects a command of starting the engine in a variable meaning mode, the PCU judges whether the rotating speed of the engine is higher than a set threshold value or not by combining the rotating speed of the engine, and if yes, the PCU sends a command of recovering oil injection and ignition of the engine; the engine executes an engine recovery fuel injection and ignition command sent by the PCU and starts an engine starting state; if not, entering a normal engine dynamic starting process.
And the PCU judges whether the engine is started successfully or not by combining with the engine starting state sent by the engine, if so, the engine is dynamically stopped or the intention in the dynamic stopping process is changed to be started and ended, and if not, the normal engine dynamic starting process is started.
Further comprising, sending a drive torque transfer command when the PCU enters a dynamic engine stop state during driving; the engine, the motor 1 and the motor 2 execute a driving torque transfer command and send out a torque transfer state; the PCU judges whether the series-parallel connection clutch can be disconnected or not according to the torque transfer state, if yes, the series-parallel connection clutch is controlled to be disconnected, the engine fuel cut-off and flameout commands are sent out, the engine performs fuel cut-off and flameout, the engine fuel cut-off state is sent out, and the PCU judges whether the engine completes fuel cut-off or not according to the engine fuel cut-off state sent out by the engine.
The invention also provides a vehicle engine dynamic stop and variable idea starting control system, which comprises a processor and a memory, wherein the memory is stored with a computer program, and the computer program is executed by the processor to realize the vehicle engine dynamic stop and variable idea starting control method.
The invention also provides a hybrid electric vehicle, which is provided with the series-parallel configuration hybrid electric transmission, and the vehicle is provided with the vehicle engine dynamic stop and variable idea start control system.
The present invention also provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the vehicle engine dynamic stop and variable idea start control method described above.
The invention has the following advantages:
the invention is used for carrying on the hybrid vehicle of the double-motor series-parallel configuration, in the course of engine dynamic stop, utilize electrical machinery and engine to carry on the coordinated control in the course of driving, in the course of engine stop oil spray ignition, free stall, output the torque and act on the engine by the electrical machinery, control the rotational speed of the engine to maintain the stability of short time, then control the electrical machinery to stop the torque output, make the engine stop completely. In the time of maintaining the stable rotating speed of the engine by the motor, whether a user has a requirement of starting the engine with variable intentions is judged, if yes, the engine is directly controlled to recover normal oil injection ignition so as to quickly realize the variable intentions starting, thereby shortening the time of restarting the engine with variable intentions in the dynamic stop stage of the engine and improving the dynamic response characteristic.
Drawings
FIG. 1 is a schematic configuration diagram of a hybrid vehicle to which the present invention is applicable;
FIG. 2 is a schematic diagram illustrating the control effect of the control method according to the present invention;
FIG. 3 is a flow chart illustrating a control method implemented by the present invention.
Detailed Description
The technical solutions implemented by the present invention are further described below with reference to the drawings in the specification, the described embodiments are only a part of the embodiments of the present invention, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
The embodiment of the present embodiment is based on the hybrid vehicle having the two-motor series-parallel configuration shown in fig. 1, and the powertrain in this configuration includes, but is not limited to, components such as an engine, a motor 1, a motor 2, a clutch, and a reducer. The power system can realize modes such as pure electric, range-extended driving, hybrid driving and the like by transmitting the power of the engine and the motor 1 through the disconnection and the connection of the clutch.
The implementation scheme of the embodiment is based on the control effect illustration shown in fig. 2, and the control effect illustration is that during driving, when the engine is dynamically stopped, after the engine is cut off, the engine is controlled to stably run for a certain time at a certain rotating speed, and before the rotating speed of the engine is reduced to the certain rotating speed, if there is a requirement of intentionally starting the engine, the engine can be directly controlled to perform oil injection and ignition to realize the engine.
Referring to fig. 3, the present embodiment provides a coordinated control method for dynamic stop and variable intention start of a vehicle engine, which uses a PCU, an engine, a motor 1 and a motor 2 to perform coordinated control for dynamic stop of the engine during driving and variable intention during dynamic stop of the engine, and restart of the engine. The overall scheme is as follows: the PCU controls the engine, the motor 1 and the motor 2 to carry out torque transfer in the driving dynamic stop process, after the driving torque of the motor 1 and the driving torque of the motor are transferred to the motor 2, the PCU commands the engine to cut off fuel and stop the engine, after the engine cuts off fuel and stops the engine, the PCU commands the motor 1 to output torque to maintain the rotating speed of the engine in a stable state and continue for a certain time, after a certain time, if the command of changing the intention to start the engine does not exist, the motor 1 stops stabilizing the rotating speed of the engine, the rotating speed of the engine gradually decreases to 0rpm, and the dynamic stop of the engine is finished; if the engine is started with the changed idea, the PCU commands the engine to inject and ignite, the engine is started with the changed idea, if the engine is failed to start, the whole vehicle starts the engine normally and dynamically, and if the engine is started successfully, the engine is started with the changed idea and ended.
The detailed steps are as follows:
step 1, the PCU enters a dynamic stop state of an engine in the driving process and sends a driving torque transfer command.
And step 2, the engine, the motor 1 and the motor 2 execute a driving torque transfer command, transfer the driving torques of the motor 1 and the engine onto the motor 2, and send out a torque transfer state.
And 3, judging whether the series-parallel connection clutch can be disconnected or not by the PCU according to the torque transfer states sent by the engine, the motor 1 and the motor 2, if so, entering the step 4, otherwise, returning to the step 1.
And step 4, the PCU controls to disconnect the series-parallel connection clutch.
And step 5, the PCU sends out the commands of fuel cut and flameout of the engine.
And 6, the engine executes the engine fuel cut-off and flameout commands sent by the PCU and sends the engine fuel cut-off state.
And 7, the PCU judges whether the engine finishes fuel cut according to the engine fuel cut state sent by the engine, if so, the step 8 is carried out, and if not, the step 5 is returned.
In step 8, the PCU sends a steady engine speed command.
And 9, executing an engine rotating speed stabilizing command by the motor 1 through output torque, stabilizing the rotating speed of the engine at a certain rotating speed, and quitting after a certain time. And after the motor is out of the stable engine rotating speed control for a certain time, the engine is completely stopped, and the stopping process of the engine is finished.
The rotation speed is a calibration quantity, the initial value is 400rpm, and calibration matching is carried out according to the real vehicle state. The time is also a calibration quantity, the initial value is 300ms, and calibration matching is carried out according to the real vehicle state.
In step 10, the PCU detects a change of mind engine start command and simultaneously issues an exit steady engine speed command.
And step 11, the PCU judges whether the rotating speed of the engine is higher than a certain threshold value or not by combining the rotating speed of the engine, if so, the step 12 is carried out, and if not, the normal dynamic starting process of the engine is carried out. The threshold values are also calibration quantities, the initial value is 300rpm, and calibration matching is carried out according to the actual state of the engine.
In step 12, the PCU issues an engine resume fuel injection ignition command.
And step 13, the engine executes an engine recovery fuel injection and ignition command sent by the PCU and starts an engine starting state.
And 14, the PCU judges whether the engine is started successfully or not by combining the engine starting state sent by the engine, if so, the step 15 is carried out, and if not, the normal engine dynamic starting process is carried out.
And step 15, finishing the dynamic stop of the engine or the change of the mind starting in the dynamic stop process.
In another embodiment of the present invention, there is also provided a vehicle engine dynamic stop and variable idea start coordination control system, which comprises a processor and a memory, wherein the memory stores a computer program, and the computer program is executed by the processor to realize the vehicle engine dynamic stop and variable idea start coordination control method according to the above technical method
In still another embodiment of the present invention, a computer-readable storage medium is further provided, on which a computer program is stored, wherein the computer program, when executed by a processor, implements the vehicle engine dynamic stop and variable-idea start coordination control method according to the above technical solution.

Claims (9)

1. A vehicle engine dynamic stop and variable idea start control method is characterized in that the method monitors the dynamic stop of the engine in the driving process, controls the rotating speed of the engine to maintain stable for a short time in the dynamic stop process of the engine, and then completely stops the engine; if the engine rotation speed is stabilized in a short time and the requirement of the engine is met, the engine is directly controlled to recover the normal oil injection ignition, and the variable-idea starting is realized.
2. The vehicle engine dynamic stop and change idea start control method according to claim 1, wherein the method for controlling the engine speed to maintain a short time stability and then complete stop is: and after the PCU judges that the engine finishes fuel cut, sending an engine rotating speed stabilizing command, stabilizing the rotating speed of the engine at a certain rotating speed through the output torque of the motor, and quitting after the rotating speed is maintained for a certain time.
3. The vehicle engine dynamic stop and variable idea start control method according to claim 1, wherein when there is a need to start the engine variably, the method of directly controlling the engine to resume normal fuel injection ignition is:
when the PCU detects a command of starting the engine with changing intentions, the PCU judges whether the rotating speed of the engine is higher than a set threshold value or not by combining the rotating speed of the engine, and if so, the PCU sends a command of recovering oil injection and ignition of the engine; the engine executes an engine recovery fuel injection and ignition command sent by the PCU and starts an engine starting state; if not, entering a normal engine dynamic starting process.
4. The vehicle engine dynamic stop and change idea start control method according to claim 3, wherein the PCU determines whether the engine is successfully started in conjunction with an engine start state from the engine, if so, the engine dynamic stop or change idea start is completed in the dynamic stop process, otherwise, the normal engine dynamic start process is entered.
5. The vehicle engine dynamic stop and change of mind start control method according to claim 1,
sending a driving torque transfer command when the PCU enters a dynamic stop state of the engine in the driving process; the engine, the motor 1 and the motor 2 execute a driving torque transfer command and send out a torque transfer state; the PCU judges whether the series-parallel connection clutch can be disconnected or not according to the torque transfer state, if yes, the series-parallel connection clutch is controlled to be disconnected, the engine fuel cut-off and flameout commands are sent out, the engine performs fuel cut-off and flameout, the engine fuel cut-off state is sent out, and the PCU judges whether the engine completes fuel cut-off or not according to the engine fuel cut-off state sent out by the engine.
6. The vehicle engine dynamic stop and variable idea start control method according to any one of claims 1 to 5, characterized in that the certain rotation speed, the certain time and the set threshold are calibrated quantities, and calibration matching is performed according to the actual conditions of the whole vehicle.
7. A vehicle engine dynamic stop and change idea starting control system, characterized by comprising a processor and a memory, wherein the memory stores a computer program, and the computer program is executed by the processor to realize the vehicle engine dynamic stop and change idea starting control method according to any one of claims 1-6.
8. A hybrid vehicle equipped with a hybrid transmission of a series-parallel configuration, characterized by being equipped with the vehicle engine dynamic stop and variable-idea start control system according to claim 7.
9. A computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the vehicle engine dynamic stop and variable idea start control method of any of claims 1 to 6.
CN202210597536.0A 2022-05-30 2022-05-30 Control method and control system for dynamic stop and variable-idea starting of vehicle engine and hybrid electric vehicle Pending CN114940160A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210597536.0A CN114940160A (en) 2022-05-30 2022-05-30 Control method and control system for dynamic stop and variable-idea starting of vehicle engine and hybrid electric vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210597536.0A CN114940160A (en) 2022-05-30 2022-05-30 Control method and control system for dynamic stop and variable-idea starting of vehicle engine and hybrid electric vehicle

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CN114940160A true CN114940160A (en) 2022-08-26

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CN202210597536.0A Pending CN114940160A (en) 2022-05-30 2022-05-30 Control method and control system for dynamic stop and variable-idea starting of vehicle engine and hybrid electric vehicle

Country Status (1)

Country Link
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