CN115325158A - Vehicle start-stop control method, system, equipment and medium - Google Patents

Vehicle start-stop control method, system, equipment and medium Download PDF

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Publication number
CN115325158A
CN115325158A CN202211031958.8A CN202211031958A CN115325158A CN 115325158 A CN115325158 A CN 115325158A CN 202211031958 A CN202211031958 A CN 202211031958A CN 115325158 A CN115325158 A CN 115325158A
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China
Prior art keywords
stop
engine
clutch
vehicle
controller
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Pending
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CN202211031958.8A
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Chinese (zh)
Inventor
吴光强
杨庆
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Tongji University
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Tongji University
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Priority to CN202211031958.8A priority Critical patent/CN115325158A/en
Publication of CN115325158A publication Critical patent/CN115325158A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/40—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism comprising signals other than signals for actuating the final output mechanisms
    • F16H63/50—Signals to an engine or motor
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0215—Introducing corrections for particular conditions exterior to the engine in relation with elements of the transmission
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0215—Introducing corrections for particular conditions exterior to the engine in relation with elements of the transmission
    • F02D41/022—Introducing corrections for particular conditions exterior to the engine in relation with elements of the transmission in relation with the clutch status
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/042—Introducing corrections for particular operating conditions for stopping the engine
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/50—Inputs being a function of the status of the machine, e.g. position of doors or safety belts
    • F16H59/56—Inputs being a function of the status of the machine, e.g. position of doors or safety belts dependent on signals from the main clutch
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/60—Inputs being a function of ambient conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/68—Inputs being a function of gearing status
    • F16H59/72—Inputs being a function of gearing status dependent on oil characteristics, e.g. temperature, viscosity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/0021—Generation or control of line pressure
    • F16H61/0025—Supply of control fluid; Pumps therefore
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/04—Smoothing ratio shift
    • F16H61/0403—Synchronisation before shifting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/04—Smoothing ratio shift
    • F16H61/06—Smoothing ratio shift by controlling rate of change of fluid pressure
    • F16H61/061—Smoothing ratio shift by controlling rate of change of fluid pressure using electric control means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H2061/0015—Transmission control for optimising fuel consumptions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H2061/0075—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by a particular control method
    • F16H2061/0087—Adaptive control, e.g. the control parameters adapted by learning
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/04—Smoothing ratio shift
    • F16H61/06—Smoothing ratio shift by controlling rate of change of fluid pressure
    • F16H61/061—Smoothing ratio shift by controlling rate of change of fluid pressure using electric control means
    • F16H2061/062—Smoothing ratio shift by controlling rate of change of fluid pressure using electric control means for controlling filling of clutches or brake servos, e.g. fill time, fill level or pressure during filling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
    • F16H2061/1208—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures with diagnostic check cycles; Monitoring of failures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
    • F16H2061/1256—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected
    • 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
    • Y02T10/40—Engine management systems

Abstract

The invention relates to the technical field of double-clutch automatic transmission control, and discloses a vehicle start-stop control method, a vehicle start-stop control system, vehicle start-stop control equipment and a vehicle start-stop control medium. According to the invention, after a stop signal of an engine controller is received, stop condition judgment is carried out, and when the stop condition is met, the double-clutch automatic gearbox is controlled to be disengaged from a vehicle transmission chain; sending a stop permission mark to an engine controller so that the engine controller can control the engine to stop; after a stop state signal sent by an engine controller is received, judging a starting condition, and when the starting condition is met, sending a start permission mark to the engine controller so that the engine controller can control the engine to start; therefore, the response time in vehicle starting control is shortened, and the drivability under the rapid starting working condition is improved.

Description

Vehicle start-stop control method, system, equipment and medium
Technical Field
The invention relates to the technical field of control of double-clutch automatic transmissions, in particular to a vehicle start and stop control method, system, equipment and medium.
Background
Two clutches in the double-clutch automatic gearbox are connected with two input shafts, and gear shifting and clutch operation are realized by a mechanical electronic module integrating electronic and hydraulic elements. The vehicle start-stop control is realized through coordination between the double-clutch automatic gearbox and the engine, and the fuel economy of the vehicle can be improved.
At present, the power transmission of the automatic gearbox needs the cooperation of a clutch and a synchronizer by combining the structural principle and the working characteristics of the double-clutch automatic gearbox; the synchronizer needs to complete the gear selecting and shifting operation of the target gear synchronizer, the clutch needs to complete the oil filling operation, a certain time is usually spent, and particularly, the action time required under the low-temperature working condition is longer. In order to quickly meet the power demand of a driver in the starting process after the engine is stopped, the gearbox needs to shorten the action time as much as possible, respond to the demand of the driver in time and transmit the power of the vehicle.
Disclosure of Invention
The invention mainly aims to provide a vehicle start-stop control method, a vehicle start-stop control system, vehicle start-stop control equipment and a vehicle start-stop control medium, and aims to shorten the response time in vehicle start control and improve the drivability under a quick start working condition.
In order to achieve the above object, the present invention provides a vehicle start-stop control method, which is applied to a transmission controller, and comprises the following steps:
after a stop signal of an engine controller is received, if the stop condition is met, controlling the double-clutch automatic gearbox to be disengaged from a vehicle transmission chain;
sending a stop permission flag to the engine controller to control the engine controller to stop;
after a stop state signal sent by the engine controller is received, if a starting condition is met, a starting permission mark is sent to the engine controller so that the engine controller can control the engine to be started.
Preferably, the twin-clutch automatic transmission comprises an odd clutch and an even clutch, and the step of controlling the twin-clutch automatic transmission to disengage the vehicle transmission chain if the stop condition is met after the stop signal is received comprises:
after the stop signal is received, timing by using a timer, and judging whether the double-clutch automatic gearbox is in a failure mode;
if not, judging whether the double-clutch automatic gearbox is in a self-learning process or not;
if not, respectively acquiring characteristic parameters and oil temperature signals of the odd-numbered clutch and the even-numbered clutch, and calculating corresponding half-joint pressure and pressure deviation values according to the characteristic parameters and the oil temperature signals; calculating a difference between the half-junction pressure and the pressure offset value, and controlling the pressures of both the odd clutch and the even clutch to the difference;
judging whether a preset gear synchronizer is in a gear or not;
if not, picking off the rest gear synchronizer, and controlling the preset gear synchronizer to execute the gear engaging operation;
acquiring the timing time of the timer, and judging whether the timing time is greater than a preset time limit value or not;
if not, the preset gear synchronizer is controlled to execute gear engaging operation until the preset gear synchronizer finishes gear engaging, and the double-clutch automatic gearbox is controlled to be disengaged from the vehicle transmission chain.
Preferably, after the step of receiving the stop signal of the engine controller, the method further comprises:
and sending a stop prohibition flag to the engine controller when the stop condition is not met.
Preferably, after the step of sending the stop permission flag to the engine controller for the engine controller to control the engine to stop, the method further comprises:
after the stop permission mark is sent to the engine controller, the corresponding first pressure is determined according to the control requirement of the preset clutch, and the output pressure of the electronic oil pump is controlled to be the first pressure so as to meet the control requirement of the oil filling action of the preset clutch.
Preferably, after receiving the stop state signal sent by the engine controller, if a start condition is met, the step of sending a start permission flag to the engine controller includes:
after the stop state signal of the engine is received, controlling a preset gear synchronizer to be in a gear, and controlling the rest gear synchronizers not to act;
acquiring map information, a current traffic light state and a front vehicle position, and predicting vehicle starting time according to the map information, the current traffic light state and the front vehicle position;
and controlling the electronic oil pump and the preset clutch to enter a set state according to the vehicle starting time, and sending a start permission mark to the engine controller after determining that the electronic oil pump and the preset clutch enter the set state.
Preferably, the step of controlling the electronic oil pump and the preset clutch to enter the set state according to the vehicle start time includes:
when the timer reaches a first moment before the vehicle starting time, determining a corresponding second pressure according to the control requirements of the preset clutch and the preset gear synchronizer, and controlling the output pressure of the electronic oil pump to be the second pressure so as to meet the control requirements of the action of the preset clutch and the action of the preset gear synchronizer;
and when the timer reaches a second moment before the vehicle starting time, controlling the pressure of the preset clutch to be half-combination point pressure, and controlling the electronic oil pump and the preset clutch to enter a set state.
In order to achieve the above object, the present invention further provides a vehicle start/stop control method, where the vehicle start/stop control method is applied to an engine controller, and the vehicle start/stop control method includes the following steps:
sending a stop signal to a transmission controller, so that the transmission controller controls the double-clutch automatic transmission to be disconnected from a vehicle transmission chain if the stop condition is met after receiving the stop signal of the engine controller; sending a shutdown permission flag to the engine controller;
receiving a stop permission mark sent by the gearbox controller, controlling an engine to stop according to the stop permission mark, and sending a stop state signal of the engine to the gearbox controller, so that the gearbox controller sends a start permission mark to the engine controller if a start condition is met after receiving the stop state signal sent by the engine controller;
and receiving the start permission flag, and controlling the engine to start according to the start permission flag.
In addition, to achieve the above object, the present invention further provides a vehicle start-stop control system, including:
the engine controller is used for sending a stop signal to the gearbox controller;
the transmission controller is used for controlling the double-clutch automatic transmission to be disconnected from a vehicle transmission chain and sending a stop permission mark to the engine controller if the stop condition is met after the stop signal is received;
the engine controller is used for receiving the stop permission mark, controlling the engine to stop according to the stop permission mark and sending a stop state signal of the engine to the gearbox controller;
the transmission controller is used for sending a start permission mark to the engine controller if a starting condition is met after a stop state signal sent by the engine controller is received;
and the engine controller is used for receiving the start permission flag and controlling the engine to start according to the start permission flag.
In addition, to achieve the above object, the present invention further provides a device, which is a vehicle start-stop control device, and the vehicle start-stop control device includes: the control method comprises a memory, a processor and a vehicle start-stop control program which is stored on the memory and can run on the processor, wherein the vehicle start-stop control program realizes the steps of the vehicle start-stop control method when being executed by the processor.
In addition, to achieve the above object, the present invention further provides a medium, which is a computer readable storage medium, wherein a vehicle start-stop control program is stored on the computer readable storage medium, and when being executed by a processor, the vehicle start-stop control program implements the steps of the vehicle start-stop control method as described above.
The invention provides a vehicle start-stop control method, a vehicle start-stop control device, vehicle start-stop control equipment and a vehicle start-stop control medium; the vehicle start-stop control method comprises the following steps: after a stop signal of an engine controller is received, if the stop condition is met, controlling the double-clutch automatic gearbox to be disengaged from a vehicle transmission chain; sending a stop permission flag to the engine controller to control the engine controller to stop; after a stop state signal sent by the engine controller is received, if a starting condition is met, a start permission mark is sent to the engine controller, so that the engine controller can control the engine to start. According to the invention, after a stop signal of an engine controller is received, stop condition judgment is carried out, when the stop condition is met, the double-clutch automatic gearbox is controlled to be disconnected from a vehicle transmission chain, and after the fact that the vehicle transmission chain is in a disconnected state is determined, a stop permission mark is sent to the engine controller so that the engine controller can control the engine to stop; after a stop state signal sent by an engine controller is received, judging a starting condition, and when the starting condition is met, sending a start permission mark to the engine controller so that the engine controller can control the engine to start; therefore, the response time in vehicle starting control is shortened, and the drivability under the rapid starting working condition is improved.
Drawings
FIG. 1 is a schematic diagram of an apparatus architecture of a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a first embodiment of a vehicle start-stop control method according to the present invention;
FIG. 3 is a schematic flow chart of start-stop coordination of a transmission controller according to the vehicle start-stop control method;
FIG. 4 is a schematic view of a sub-process of a first embodiment of a vehicle start-stop control method according to the present invention;
FIG. 5 is a flowchart illustrating a second embodiment of a vehicle start-stop control method according to the present invention;
FIG. 6 is a schematic flowchart of a third embodiment of a vehicle start-stop control method according to the present invention;
FIG. 7 is a flowchart illustrating a fourth embodiment of a vehicle start-stop control method according to the present invention;
FIG. 8 is a schematic flow chart diagram illustrating a fifth embodiment of a vehicle start-stop control method according to the present invention;
fig. 9 is a functional block diagram of the first embodiment of the vehicle start-stop control device according to the present invention.
The implementation, functional features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
As shown in fig. 1, fig. 1 is a schematic device structure diagram of a hardware operating environment according to an embodiment of the present invention.
The device of the embodiment of the invention can be a mobile terminal or a server device.
As shown in fig. 1, the apparatus may include: a processor 1001, such as a CPU, a network interface 1004, a user interface 1003, a memory 1005, a communication bus 1002. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 1005 may be a high-speed RAM memory or a non-volatile memory (e.g., a magnetic disk memory). The memory 1005 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the configuration of the apparatus shown in fig. 1 is not intended to be limiting of the apparatus and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.
As shown in fig. 1, the memory 1005, which is a kind of computer storage medium, may include therein an operating system, a network communication module, a user interface module, and a vehicle start-stop control program.
The operating system is a program for managing and controlling the vehicle start-stop control equipment and software resources and supports the operation of a network communication module, a user interface module, a vehicle start-stop control program and other programs or software; the network communication module is used for managing and controlling the network interface 1002; the user interface module is used to manage and control the user interface 1003.
In the vehicle start-stop control apparatus shown in fig. 1, the vehicle start-stop control apparatus calls a vehicle start-stop control program stored in a memory 1005 by a processor 1001 and performs operations in various embodiments of the vehicle start-stop control method described below.
Based on the hardware structure, the embodiment of the vehicle start-stop control method is provided.
Referring to fig. 2, fig. 2 is a schematic flowchart of a first embodiment of a vehicle start-stop control method according to the present invention, where the vehicle start-stop control method includes:
step S10, after a stop signal of an engine controller is received, if the stop condition is met, controlling the double-clutch automatic gearbox to be disengaged from a vehicle transmission chain;
step S20, sending a stop permission mark to the engine controller so that the engine controller can control the engine to stop;
and step S30, after the stop state signal sent by the engine controller is received, if a starting condition is met, sending a start permission mark to the engine controller so that the engine controller can control the engine to start.
In the embodiment, after the stop signal of the engine controller is received, the stop condition is judged, and when the stop condition is met, the double-clutch automatic gearbox is controlled to be disengaged from a vehicle transmission chain; sending a stop permission mark to an engine controller so that the engine controller can control the engine to stop; after a stop state signal sent by an engine controller is received, starting condition judgment is carried out, and when the starting condition is met, a start permission mark is sent to the engine controller so that the engine controller can control the engine to start; therefore, the response time in vehicle starting control is shortened, and the driving performance under the rapid starting working condition is improved.
The respective steps will be described in detail below:
and step S10, after a stop signal of the engine controller is received, if the stop condition is met, controlling the double-clutch automatic gearbox to be disengaged from a vehicle transmission chain.
In the embodiment, the vehicle start-stop control method is applied to the gearbox controller, and through the coordination control between the gearbox controller and the engine controller, the response time in the vehicle start controller is shortened, and the drivability under the rapid start working condition is improved. The transmission controller is preferably a controller (TCU) of a dual clutch automatic transmission.
When the vehicle is in a low-speed sliding or static state, for example, at a traffic light such as a road junction, a gear shifting handle of the vehicle is in a position of 'forward gear (D)' and a brake pedal is in a treading state. And an Engine Controller (ECU) performs engine stop control according to the relevant working condition judgment and state calculation. Referring to fig. 3, fig. 3 is a schematic diagram of a process of performing start-stop coordination by a transmission controller, and the Transmission Controller (TCU) performs start-stop coordination control according to the process shown in fig. 3.
After the Transmission Controller (TCU) receives a stop signal of an Engine Controller (ECU), the Transmission Controller (TCU) judges a stop condition according to a stop sign. The system comprises a gear box controller (TCU), a power supply and a power supply, wherein the shutdown condition is a preset shutdown signal, and when the shutdown condition is met, the TCU executes preparation work for shutdown; shutdown conditions include, but are not limited to: the current gear of the double-clutch automatic gearbox is in a forward gear (D); the dual clutch automatic transmission is in a "non-failure mode"; the double-clutch automatic gearbox is in a non-self-learning process and the like.
After a Transmission Controller (TCU) judges the stop condition, when the stop condition is determined to be met, the double-clutch automatic transmission is controlled to be disconnected from a vehicle transmission chain; and after determining that the vehicle drive train is in the disengaged state, the Transmission Controller (TCU) sends a halt permission flag to the Engine Controller (ECU) for the Engine Controller (ECU) to control the engine to halt.
The double-clutch automatic gearbox comprises an odd clutch C1 and an even clutch C2; after a vehicle transmission chain is in a disengagement state, simultaneously controlling a preset clutch to finish oil filling, and making preparation for quick preset clutch response after an engine is started when the preset clutch is in a state close to a half-joint point; and controlling a preset gear synchronizer to be in a gear state; the preset clutch is a clutch which is used for preparing for the next start after the engine is stopped, and can be an odd clutch C1 or an even clutch C2. The preset gear synchronizer is a synchronizer which is used for preparing the next starting after the engine is stopped, and can be a synchronizer of an odd shaft 1 gear or a synchronizer of an even shaft 2 gear. That is, the Transmission Controller (TCU) is ready for a next start after the engine is shut down.
When the preset clutch is the odd clutch C1, the corresponding preset gear synchronizer is the odd shaft 1-gear synchronizer; when the preset clutch is the even clutch C2, the corresponding preset gear synchronizer is the synchronizer for the even shaft 2 gear.
Further, in an embodiment, after the step of receiving the stop signal of the engine controller, the vehicle start-stop control method further includes: and sending a stop prohibition flag to the engine controller when the stop condition is not met.
In one embodiment, after the Transmission Controller (TCU) judges the stop condition, when the stop condition is not met, the Transmission Controller (TCU) sends a stop prohibition flag to an Engine Controller (ECU); and when the non-stop condition is met, the engine is controlled to maintain the current running state, such as the current engine is in a low-speed sliding state or a static state, through the coordination control between a Transmission Control Unit (TCU) and an Engine Control Unit (ECU).
And step S20, sending a stop permission flag to the engine controller so that the engine controller can control the engine to stop.
In the embodiment, after a Transmission Controller (TCU) judges the stop condition, when the stop condition is determined to be met, the double-clutch automatic transmission is controlled to be disconnected from a vehicle transmission chain; and after determining that the vehicle drive train is in the disengaged state, the Transmission Controller (TCU) sends a halt permission flag to the Engine Controller (ECU) for the Engine Controller (ECU) to control the engine to halt.
Furthermore, the Transmission Controller (TCU) keeps the preset gear synchronizer in the gear state while the engine is in the stop state; the preset gear synchronizer can be an odd shaft 1 gear synchronizer or an even shaft 2 gear synchronizer.
For example, the synchronizer controlling the 1 gear of the odd shaft is in a gear state, and the odd shaft synchronizers of other gears are forbidden to act; other gears include, but are not limited to, 3 th gear, 5 th gear, etc.
Or, controlling the synchronizer of the even-numbered shaft 2 gear to be in a gear state, and forbidding the even-numbered shaft synchronizers of other gears to act; wherein, other gears include but are not limited to 4 gears, 6 gears, etc.
When the engine is in a stop state, a Transmission Control Unit (TCU) controls the output pressure of an electronic oil pump to be a first pressure P1; the first pressure P1 is obtained by calculation according to the control requirement of the preset clutch, the action requirement of the synchronizer is not needed to be considered in the first pressure P1, and the pressure output required by the electronic oil pump is combined with certain pressure redundancy in order to meet the pressure requirement of the preset clutch near a half-joint point under the condition that the mechanical pump does not work under the stop state of the engine.
Further, in an embodiment, referring to fig. 4, after step S20, the vehicle start-stop control method further includes: after the stop permission mark is sent to the engine controller, the corresponding first pressure is determined according to the control requirement of the preset clutch, and the output pressure of the electronic oil pump is controlled to be the first pressure so as to meet the control requirement of the oil filling action of the preset clutch.
In the embodiment, after the Transmission Controller (TCU) sends the stop permission flag to the Engine Controller (ECU), the Transmission Controller (TCU) controls the output pressure of the electronic oil pump to be the first pressure P1; the first pressure P1 is obtained by calculation according to the control requirement of the preset clutch, the action requirement of the preset synchronizer is not needed to be considered in the first pressure P1, and the pressure output required by the electronic oil pump is combined with certain pressure redundancy in order to meet the pressure requirement of the preset clutch near a half-combination point under the condition that the mechanical pump does not work under the stop state of the engine.
The output pressure of the electronic oil pump is the first pressure P1, the control requirement of the oil filling action of the preset clutch is met, and the power requirement of the electronic oil pump is obviously reduced.
And step S30, after receiving the stop state signal sent by the engine controller, if the stop state signal meets the starting condition, sending a start permission flag to the engine controller so that the engine controller can control the engine to start.
In one embodiment, a Transmission Control Unit (TCU) judges a starting condition after receiving a stop state signal sent by an engine controller; after the starting condition of a Transmission Controller (TCU) is judged, when the starting condition is determined to be met, a start permission mark is sent to an Engine Controller (ECU) so that the Engine Controller (ECU) can control the engine to start.
Wherein, the starting conditions include but are not limited to: whether the output pressure of the electronic oil pump meets the action requirements of a preset clutch action and a preset gear synchronizer or not; whether the electronic oil pump and the preset clutch are brought into a set state, etc., within the predicted vehicle start time T.
Specifically, road feel information is obtained from other controllers of the vehicle, and the vehicle starting time of the next starting of the vehicle is predicted according to the road feel information; the road feeling information includes, but is not limited to, map information, traffic light states, front vehicle positions and the like; the vehicle starting time is the time interval T between the start of the engine stopping this time and the next start of the engine, which is calculated in real time.
A Transmission Control Unit (TCU) controls the electronic oil pump and a preset clutch to set states according to vehicle starting time; the set state is a work preparation state of the electronic oil pump and the preset clutch for quick power transmission after the engine is started when the vehicle is started quickly.
And after determining that the electronic oil pump and the preset clutch enter the set state, the Transmission Control Unit (TCU) sends a start permission flag to an Engine Control Unit (ECU) so as to send the start permission flag to control the engine to start according to the start permission flag.
In the embodiment, after a stop signal of an engine controller is received, stop condition judgment is carried out, when the stop condition is met, the double-clutch automatic gearbox is controlled to disconnect a vehicle transmission chain, and after the fact that the vehicle transmission chain is in a disconnection state is determined, a stop permission mark is sent to the engine controller so that the engine controller can control the engine to stop; after receiving a stop state signal of the engine, judging a starting condition, and sending a start permission mark to an engine controller when the starting condition is met so that the engine controller can control the engine to start; therefore, the response time in vehicle starting control is shortened, and the drivability under the rapid starting working condition is improved.
Further, a second embodiment of the vehicle start-stop control method is provided based on the first embodiment of the vehicle start-stop control method.
The difference between the second embodiment of the vehicle start-stop control method and the first embodiment of the vehicle start-stop control method is that in this embodiment, for step S10, after the stop signal is received, if the stop condition is met, the dual clutch automatic transmission is controlled to disengage the refinement of the vehicle transmission chain, referring to fig. 5, the step specifically includes:
step S11, after the stop signal is received, a timer is used for timing, and whether the double-clutch automatic gearbox is in a failure mode or not is judged;
s12, if not, judging whether the double-clutch automatic gearbox is in a self-learning process or not;
step S13, if not, respectively acquiring characteristic parameters and oil temperature signals of the odd-numbered clutch and the even-numbered clutch, and calculating corresponding half-joint pressure and pressure deviation values according to the characteristic parameters and the oil temperature signals; calculating a difference between the half-tie-point pressure and the pressure offset value, and controlling the pressures of both the odd-numbered clutch and the even-numbered clutch to the difference;
step S14, judging whether a preset gear synchronizer is in a gear or not;
step S15, if not, the rest gear synchronizer is removed, and the preset gear synchronizer is controlled to execute gear engaging operation;
step S16, acquiring the timing time of the timer, and judging whether the timing time is greater than a preset time limit value;
and S17, if not, controlling the preset gear synchronizer to execute gear engaging operation until the preset gear synchronizer finishes gear engaging, and controlling the double-clutch automatic gearbox to disengage from a vehicle transmission chain.
In the embodiment, after the stop sign is received, a timer is used for timing, and whether the double-clutch automatic gearbox is in the failure mode or not and the self-learning process are detected; when the double-clutch automatic gearbox is not in a failure mode and in a self-learning process, the pressure of the odd-numbered clutch and the pressure of the even-numbered clutch are controlled to be in a pressure state close to a half-junction point; judging whether a preset gear synchronizer is in a gear or not; if not, the rest gear synchronizer is removed, and the preset gear synchronizer is controlled to execute gear engaging operation; acquiring the timing time of the timer, and judging whether the timing time is greater than a preset time limit value or not; if not, controlling the preset gear synchronizer to execute the gear engaging operation until the preset gear synchronizer finishes the gear engaging, and controlling the double-clutch automatic gearbox to be disengaged from the vehicle transmission chain; therefore, the vehicle can normally run, the start and stop control of the engine can be safely and reliably assisted, and the fuel saving is facilitated.
The respective steps will be described in detail below:
and S11, after the stop signal is received, timing by using a timer, and judging whether the double-clutch automatic gearbox is in a failure mode.
In this embodiment, after the Transmission Controller (TCU) receives a stop signal from the Engine Controller (ECU), the Transmission Controller (TCU) determines a stop condition based on the stop signal.
Firstly, when a stop signal of an Engine Controller (ECU) is received, a timer is used for timing, and whether the double-clutch automatic gearbox is in a failure mode or not is detected.
When a Transmission Controller (TCU) detects that the double-clutch automatic transmission is in fault, stopping the engine stop preparation work in time and sending a stop prohibition mark to an Engine Controller (ECU);
when the Transmission Controller (TCU) detects that the double clutch automatic transmission is not out of order, the Transmission Controller (TCU) continues to perform engine stop preparation.
Further, in an embodiment, after step S11, the vehicle start-stop control method further includes: and if so, sending the stop prohibition mark to the engine controller.
In the present embodiment, when the Transmission Controller (TCU) detects that the twin-clutch automatic transmission is in the failure mode, the engine stop preparation work is suspended in time, and a stop prohibition flag is sent to the Engine Controller (ECU).
And S12, if not, judging whether the double-clutch automatic gearbox is in a self-learning process.
In the present embodiment, it is detected whether the twin-clutch automatic transmission is in a self-learning process when the Transmission Controller (TCU) detects that the twin-clutch automatic transmission is not malfunctioning. The twin-clutch automatic transmission includes an odd clutch C1 and an even clutch C2.
The self-learning process is a self-learning process for detecting the half-joint point pressure values of the odd-numbered clutch C1 and the even-numbered clutch C2 according to the control parameters and the control logic of the double-clutch automatic gearbox, and the half-joint point pressure values of the odd-numbered clutch C1 and the even-numbered clutch C2 are adjusted along with the use process of the vehicle, so that the half-joint point pressure values of the odd-numbered clutch C1 and the even-numbered clutch C2 are matched with the whole vehicle self-adaption process of the current working states of the odd-numbered clutch C1 and the even-numbered clutch C2 in real time.
When a Transmission Controller (TCU) detects that the double-clutch automatic transmission is in a self-learning process, stopping the engine stop preparation work in time and sending a stop prohibition mark to an Engine Controller (ECU);
when the Transmission Controller (TCU) detects that the double clutch automatic transmission is not in the self-learning process, the Transmission Controller (TCU) continues to perform the preparation for stopping the engine.
Further, in an embodiment, after step S12, the vehicle start-stop control method further includes: and if so, sending the stop prohibition mark to the engine controller.
In the embodiment, when the Transmission Controller (TCU) detects that the double-clutch automatic transmission is in the self-learning process, the engine stop preparation work is stopped in time, and a stop prohibition mark is sent to the Engine Controller (ECU).
Step S13, if not, respectively acquiring characteristic parameters and oil temperature signals of the odd-numbered clutch and the even-numbered clutch, and calculating corresponding half-joint pressure and pressure deviation values according to the characteristic parameters and the oil temperature signals; calculating a difference between the half-junction pressure and the pressure offset value, and controlling pressures of both the odd-numbered clutch and the even-numbered clutch to be the difference.
In this embodiment, the Transmission Controller (TCU) continues to perform engine stop preparation when the Transmission Controller (TCU) detects that the dual clutch automatic transmission is not in the self-learning process.
The twin-clutch automatic transmission includes an odd clutch C1 and an even clutch C2.
Respectively obtaining characteristic parameters and oil temperature signals of the odd-numbered clutch C1 and the even-numbered clutch C2, calculating half-joint pressure of the odd-numbered clutch C1 and the half-joint pressure of the even-numbered clutch C2 according to the characteristic parameters and the oil temperature signals, and calculating a corresponding pressure deviation value according to the oil temperature signals.
Wherein, the half-coupling point pressure KP1 of the odd clutch C1, and the pressure deviation value of the odd clutch C1 is DP1; a half-engagement point pressure KP1 of the even-numbered clutch C2, a pressure offset value of the even-numbered clutch C2 being DP2;
calculating the difference value between the half-combination point pressure KP1 and the pressure deviation value DP1 of the odd-numbered clutch C1, namely KP1-DP1; and controlling the pressure of the odd clutch C1 to the difference value KP1-DP1.
Calculating the difference value between the half-combination point pressure KP2 and the pressure deviation value DP2 of the even-numbered clutch C2, namely KP2-DP2; and controlling the pressure of the even-numbered clutch C2 to the difference value KP2-DP2.
That is, the Transmission Controller (TCU) controls the odd-numbered clutch C1 and the even-numbered clutch C2 to be in a state close to the half-junction pressure.
The half-junction pressure is a critical-point pressure at which the odd-numbered clutch and the even-numbered clutch are close to being joined.
And step S14, judging whether the preset gear synchronizer is in the gear.
In the present embodiment, after controlling both the odd clutch C1 and the even clutch C2 to be in a state close to the half-engagement point pressure, it is determined whether the preset-gear synchronizer is in the in-gear state; the preset gear synchronizer can be an odd shaft 1 gear synchronizer or an even shaft 2 gear synchronizer.
When the preset gear synchronizer is the odd-shaft 1-gear synchronizer, the odd-shaft synchronizers of other gears include but are not limited to 3-gear, 5-gear and the like, and the odd-shaft synchronizers of other gears are also called as the odd-shaft synchronizers of the remaining gears.
When the preset gear synchronizer is the synchronizer for the even-numbered shaft 2 gear, the even-numbered shaft synchronizers for other gears include, but are not limited to, 2 gear, 4 gear, 6 gear, etc., and the even-numbered shaft synchronizers for other gears are also called as the even-numbered shaft synchronizers for the remaining gears.
When a Transmission Control Unit (TCU) detects that a preset gear synchronizer is not in a gear, the residual gear synchronizer is removed, so that the residual gear synchronizer is controlled to be in a non-gear state, and the gear engaging operation is performed on the preset gear synchronizer;
when the Transmission Controller (TCU) detects that the preset gear synchronizer is in the gear, the Transmission Controller (TCU) sends a stop permission flag to the Engine Controller (ECU), and the Transmission Controller (TCU) continues to execute preparation work for stopping the engine.
Further, in an embodiment, after step S14, the vehicle start-stop control method further includes: if so, a stop permission flag is sent to the engine controller.
In this embodiment, when the Transmission Controller (TCU) detects that the preset-gear synchronizer is in gear, the Transmission Controller (TCU) sends a stop-allowed flag to the Engine Controller (ECU), and the Transmission Controller (TCU) continues to perform the preparation for engine stop.
And S15, if not, removing the residual gear synchronizer, and controlling the preset gear synchronizer to execute gear engaging operation.
In this embodiment, when a Transmission Control Unit (TCU) detects that a preset gear synchronizer is not in a gear, the remaining gear synchronizer is removed, so that the remaining gear synchronizer is controlled to be in a non-gear state, and a gear engagement operation is performed on the preset gear synchronizer; the preset gear synchronizer can be an odd shaft 1 gear synchronizer or an even shaft 2 gear synchronizer.
And S16, acquiring the timing time of the timer, and judging whether the timing time is greater than a preset time limit value.
In this embodiment, after the gear engaging operation is performed on the preset gear synchronizer, the timing time of the timer is obtained, and whether the timing time is greater than a preset time limit value is judged; the preset time limit is a preset time limit, and the engine can be forcibly stopped when the preset time limit is exceeded, so that the engine is protected.
When the timing time exceeds a preset time limit value, a Transmission Control Unit (TCU) sends a forced stop sign to an Engine Control Unit (ECU) to control the engine to be forcibly stopped so as to avoid excessively influencing the stopping efficiency of the engine.
When the timing time is not provided with a preset time limit value, a Transmission Control Unit (TCU) continuously executes a gear engaging operation on a preset gear synchronizer; the Transmission Controller (TCU) continues to perform engine stop preparation.
Further, in an embodiment, after step S16, the vehicle start-stop control method further includes: if yes, sending a forced stop mark to the engine controller to control the engine to be forcibly stopped.
In the embodiment, when the timing time exceeds the preset time limit value, the Transmission Control Unit (TCU) sends a forced stop flag to the Engine Control Unit (ECU), and the engine is controlled to be forcibly stopped according to the forced stop flag so as to perform forced protection on the engine.
And S17, if not, controlling the preset gear synchronizer to execute gear engaging operation until the preset gear synchronizer finishes gear engaging, and controlling the double-clutch automatic gearbox to disengage from a vehicle transmission chain.
In the embodiment, when the timing time does not exceed the preset time limit, a Transmission Controller (TCU) controls a preset gear synchronizer to continue to perform the gear engaging operation, and controls the double-clutch automatic transmission to be disengaged from a vehicle transmission chain after the preset gear synchronizer finishes the gear engaging; upon determining that the vehicle drive train is in a disengaged state, the Transmission Controller (TCU) sends a stop-allowed flag to the Engine Controller (ECU). The preset gear synchronizer can be a synchronizer of an odd shaft 1 gear or a synchronizer of an even shaft 2 gear.
In the embodiment, after the stop sign is received, a timer is used for timing, and whether the double-clutch automatic gearbox is in the failure mode or not and the self-learning process are detected; when the double-clutch automatic gearbox is not in a failure mode and in a self-learning process, the pressure of the odd-numbered clutch and the pressure of the even-numbered clutch are controlled to be in a state close to a half-combination point pressure; judging whether a preset gear synchronizer is in a gear or not; if not, the rest gear synchronizer is removed, and the preset gear synchronizer is controlled to execute gear engaging operation; acquiring the timing time of a timer, and judging whether the timing time is greater than a preset time limit value or not; if not, controlling the preset gear synchronizer to execute the gear engaging operation until the preset gear synchronizer finishes the gear engaging, and controlling the double-clutch automatic gearbox to be disengaged from the vehicle transmission chain; therefore, the vehicle can normally run, the start and stop control of the engine can be safely and reliably assisted, and the fuel saving is facilitated.
Further, based on the first and second embodiments of the vehicle start-stop control method, a third embodiment of the vehicle start-stop control method is provided.
The third embodiment of the vehicle start-stop control method is different from the first and second embodiments of the vehicle start-stop control method in that in step S20, after receiving the stop state signal sent by the engine controller, if the start condition is satisfied, the third embodiment sends a start permission flag to the engine controller for refinement, and referring to fig. 6, the step specifically includes:
step S21, after the stop state signal of the engine is received, controlling a preset gear synchronizer to be in a gear, and controlling the rest gear synchronizers not to act;
step S22, obtaining map information, a current traffic light state and a front vehicle position, and predicting vehicle starting time according to the map information, the current traffic light state and the front vehicle position;
and S23, controlling the electronic oil pump and the preset clutch to enter a set state according to the vehicle starting time, and sending a starting permission mark to the engine controller after determining that the electronic oil pump and the preset clutch enter the set state.
In the embodiment, after the stop state signal of the engine is received, the preset gear synchronizer is controlled to be in a gear, and the rest gear synchronizers are controlled not to act; acquiring map information, a current traffic light state and a front vehicle position, and predicting vehicle starting time according to the map information, the current traffic light state and the front vehicle position; controlling the electronic oil pump and the preset clutch to enter a set state according to the starting time of the vehicle, and sending a start permission mark to the engine controller after determining that the electronic oil pump and the preset clutch enter the set state; therefore, the quick starting requirement of the vehicle after the engine is started can be responded to quickly, and the intelligent level of the double-clutch automatic gearbox is improved.
The respective steps will be described in detail below:
and S21, after the stop state signal of the engine is received, controlling the preset gear synchronizer to be in a gear, and controlling the rest gear synchronizers not to act.
In this embodiment, in an engine off state, the Transmission Controller (TCU) maintains the preset gear synchronizer in a gear state; and forbidding the action of the rest gear synchronizers; the preset gear synchronizer can be a synchronizer of an odd shaft 1 gear or a synchronizer of an even shaft 2 gear.
When the preset gear synchronizer is the odd-shaft 1-gear synchronizer, the odd-shaft synchronizers of other gears include but are not limited to 3-gear and 5-gear synchronizers, and the odd-shaft synchronizers of other gears are also called as the odd-shaft synchronizers of the remaining gears.
When the preset gear synchronizer is the synchronizer for the even-numbered shaft 2 gear, the even-numbered shaft synchronizers for other gears include, but are not limited to, 2 gear, 4 gear, 6 gear, etc., and the even-numbered shaft synchronizers for other gears are also called as the even-numbered shaft synchronizers for the remaining gears.
In addition, in an engine stop state, a Transmission Controller (TCU) controls the output pressure of the electronic oil pump to be a first pressure P1; the first pressure P1 is obtained by calculation according to the control requirement of the preset clutch, the action requirement of the preset gear synchronizer is not needed to be considered in the first pressure P1, and the pressure output required by the electronic oil pump is combined with certain pressure redundancy in order to meet the pressure requirement of the preset clutch near a half-combination point under the condition that the mechanical pump does not work under the stop state of the engine. The preset gear synchronizer can be an odd shaft 1 gear synchronizer or an even shaft 2 gear synchronizer.
And S22, acquiring map information, a current traffic light state and a front vehicle position, and predicting vehicle starting time according to the map information, the current traffic light state and the front vehicle position.
In the embodiment, a Transmission Controller (TCU) is used for acquiring road feel information from other controllers of the vehicle and predicting the vehicle starting time for the next starting of the vehicle according to the road feel information; the road feeling information includes, but is not limited to, map information, traffic light states, front vehicle positions and the like; the vehicle starting time T is the time interval from the start of the current stop of the engine to the next start of the engine, which is calculated in real time.
And step S23, controlling an electronic oil pump and a preset clutch to enter a set state according to the vehicle starting time, and sending a starting permission mark to the engine controller after determining that the electronic oil pump and the preset clutch enter the set state.
In the embodiment, according to the vehicle starting time T, a Transmission Controller (TCU) controls an electronic oil pump and a preset clutch to enter a set state; the set state is a work preparation state of the electronic oil pump and the preset clutch for quick power transmission after the engine is started when the vehicle is started quickly.
The preset clutch may be an odd clutch C1 or an even clutch C2.
And the Transmission Control Unit (TCU) sends a start permission flag to an Engine Control Unit (ECU) after determining that the electronic oil pump and the preset clutch enter the set state, so that the Engine Control Unit (ECU) can control the engine to start.
In the embodiment, after the stop state signal of the engine is received, the preset gear synchronizer is controlled to be in a gear, and the rest gear synchronizers are controlled not to act; acquiring map information, a current traffic light state and a front vehicle position, and predicting vehicle starting time according to the map information, the current traffic light state and the front vehicle position; controlling the electronic oil pump and the preset clutch to enter a set state according to the starting time of the vehicle; after the electronic oil pump and the preset clutch are determined to be in a set state, sending a start permission mark to an engine controller; therefore, the quick starting requirement of the vehicle after the engine is started can be responded to quickly, and the intelligent level of the double-clutch automatic gearbox is improved.
Further, a fourth embodiment of the vehicle start-stop control method is provided based on the first, second and third embodiments of the vehicle start-stop control method.
The fourth embodiment of the vehicle start-stop control method is different from the first, second, and third embodiments of the vehicle start-stop control method in that, in the present embodiment, after the step of controlling the electronic oil pump and the preset clutch to enter the set state according to the vehicle start time in step S23, referring to fig. 7, the vehicle start-stop control method further includes:
step A10, when a timer reaches a first moment before the vehicle starting time, determining a corresponding second pressure according to the control requirements of the preset clutch and the preset gear synchronizer, and controlling the output pressure of the electronic oil pump to be the second pressure so as to meet the control requirements of the action of the preset clutch and the action of the preset gear synchronizer;
and step A20, when the timer reaches a second moment before the vehicle starting time, controlling the pressure of the preset clutch to be half-junction point pressure, and controlling the electronic oil pump and the preset clutch to enter a set state.
In the embodiment, when the timer reaches a first time before the vehicle starting time, according to the control requirements of the preset clutch and the preset gear synchronizer, the corresponding second pressure is determined, and the output pressure of the electronic oil pump is controlled to be the second pressure so as to meet the control requirements of the action of the preset clutch and the action of the preset gear synchronizer; when the timer reaches a second moment before the vehicle starting time, controlling the pressure of the preset clutch to be half-combination point pressure, and controlling the electronic oil pump and the preset clutch to enter a set state; therefore, the response time after the engine is started is shortened, and the quick starting requirement of the vehicle after the engine is quickly started is facilitated.
The respective steps will be described in detail below:
and A10, when the timer reaches a first moment before the vehicle starting time, determining a corresponding second pressure according to the pressure requirements of the preset clutch and the preset gear synchronizer, and controlling the output pressure of the electronic oil pump to be the second pressure so as to meet the control requirement of the action of the preset clutch and the control requirement of the action of the preset gear synchronizer.
In the present embodiment, when the timer reaches a first time T1 before the vehicle start time T; the vehicle starting time T is the time interval between the start of the current stop of the engine and the next start of the engine calculated in real time. That is, the current time is T-T1.
When the timer reaches T-T1, a Transmission Controller (TCU) controls the output pressure of the electronic oil pump to be a second pressure P2; the second pressure P2 needs to consider the pressure requirement for rapid vehicle start after the engine is started, that is, the electronic oil pump stores the oil pressure of the corresponding double-clutch automatic transmission in advance, so as to prepare for the action of the preset clutch and the action of the preset gear synchronizer when the vehicle is rapidly started, so as to improve the response of the double-clutch automatic transmission and enhance the drivability under the starting condition.
Wherein the second pressure P2 is much greater than the first pressure P1.
Wherein the preset clutch includes an odd clutch C1 or an even clutch C2.
The preset gear synchronizer comprises a synchronizer for an odd shaft 1 gear or a synchronizer for an even shaft 2 gear.
When the preset clutch is the odd clutch C1, the corresponding preset gear synchronizer is the odd shaft 1-gear synchronizer;
when the preset clutch is the even clutch C2, the corresponding preset gear synchronizer is an even shaft 2-gear synchronizer.
And step A20, when the timer reaches a second moment before the vehicle starting time, controlling the pressure of the preset clutch to be half-combination point pressure, and controlling the electronic oil pump and the preset clutch to enter a set state.
In the present embodiment, when the timer reaches the second time T2 before the vehicle start time T, that is, the current time is T-T2; where T2< T1, i.e., the current time is closer to the vehicle launch time T.
When the timer reaches T-T2, a Transmission Control Unit (TCU) controls the pressure of a preset clutch to be half-joint point pressure KP, and preparation is made for rapid power transmission after the engine is started; the electronic oil pump and the preset clutch are controlled to enter a set state; the set state is a work preparation state of the electronic oil pump and the preset clutch for quick power transmission after the engine is started when the vehicle is started quickly.
In the embodiment, when the timer reaches a first time before the vehicle starting time, according to the control requirements of the preset clutch and the preset gear synchronizer, the corresponding second pressure is determined, and the output pressure of the electronic oil pump is controlled to be the second pressure so as to meet the control requirements of the action of the preset clutch and the action of the preset gear synchronizer; when the timer reaches a second moment before the vehicle starting time, controlling the pressure of the preset clutch to be half-combination point pressure, and controlling the electronic oil pump and the preset clutch to enter a set state; therefore, the response time after the engine is started is shortened, and the quick starting requirement of the vehicle after the engine is quickly started is facilitated.
Referring to fig. 8, fig. 8 is a schematic flowchart of a fifth embodiment of a vehicle start-stop control method according to the present invention, where the vehicle start-stop control method is applied to an engine controller, and the vehicle start-stop control method includes:
step D10, sending a stop signal to a transmission controller, so that the transmission controller controls the double-clutch automatic transmission to disconnect a vehicle transmission chain and sends a stop permission mark to the engine controller if the stop condition is met after receiving the stop signal of the engine controller;
step D20, receiving a stop permission mark sent by the gearbox controller, controlling an engine to stop according to the stop permission mark, and sending a stop state signal of the engine to the gearbox controller, so that the gearbox controller sends a start permission mark to the engine controller if a start condition is met after receiving the stop state signal sent by the engine controller;
and D30, receiving the start permission flag, and controlling the engine to start according to the start permission flag.
In the embodiment, the stop signal is sent to the gearbox controller so that the gearbox controller can judge the stop condition, when the stop condition is met, the double-clutch automatic gearbox is controlled to disconnect the vehicle transmission chain, and after the vehicle transmission chain is determined to be in the disconnection state, a stop permission mark is sent to the engine controller; when the stop permission mark is received, controlling the engine to stop, sending a stop state signal of the engine to the gearbox controller for the gearbox controller to judge the starting condition, and sending the start permission mark to the engine controller when the starting condition is met; receiving a start permission flag, and controlling the engine to start according to the start permission flag; therefore, the response time in vehicle starting control is shortened, and the drivability under the rapid starting working condition is improved.
The respective steps will be described in detail below:
and D10, sending a stop signal to a transmission controller, so that the transmission controller controls the double-clutch automatic transmission to disconnect a vehicle transmission chain and sends a stop permission mark to the engine controller if the stop condition is met after receiving the stop signal of the engine controller.
In the embodiment, the vehicle start-stop control method is applied to an Engine Controller (ECU), and through coordination control between the controller of the double-clutch automatic gearbox and the engine controller, the response time in the vehicle start controller is shortened, and the drivability under the rapid starting working condition is improved. The transmission controller is preferably a controller (TCU) of a dual clutch automatic transmission.
When the vehicle is in a low speed coasting or stationary state, the Engine Controller (ECU) sends a shutdown flag to the Transmission Controller (TCU).
After a Transmission Control Unit (TCU) receives a stop signal of an Engine Control Unit (ECU), the Transmission Control Unit (TCU) judges a stop condition according to the stop signal. The system comprises a transmission case controller (TCU), a transmission case controller (TCU) and a control module, wherein the stop condition is a preset stop signal, and when the stop condition is met, the TCU executes preparation work for stopping; shutdown conditions include, but are not limited to: the current gear of the double-clutch automatic gearbox is in a forward gear (D); the dual clutch automatic transmission is in a "non-failure mode"; the double-clutch automatic gearbox is in a non-self-learning process and the like.
After a Transmission Controller (TCU) judges the stop condition, when the stop condition is determined to be met, the double-clutch automatic transmission is controlled to be disconnected from a vehicle transmission chain; and after determining that the vehicle drive train is in the disengaged state, the Transmission Controller (TCU) sends a halt permission flag to the Engine Controller (ECU) for the Engine Controller (ECU) to control the engine to halt.
In addition, after the Transmission Controller (TCU) judges the stop condition, when the stop condition is not met, the Transmission Controller (TCU) sends a stop prohibition mark to an Engine Controller (ECU); and when the non-stop condition is met, the engine is controlled to maintain the current running state, such as the current engine is in a low-speed sliding state or a static state, through the coordination control between a Transmission Control Unit (TCU) and an Engine Control Unit (ECU).
And D20, receiving a stop permission flag sent by the gearbox controller, controlling the engine to stop according to the stop permission flag, and sending a stop state signal of the engine to the gearbox controller so that the gearbox controller sends a start permission flag to the engine controller if a start condition is met after receiving the stop state signal sent by the engine controller.
In the embodiment, a stop permission flag of a Transmission Controller (TCU) is received, and the engine is controlled to stop according to the stop permission flag; and sends a stop status signal of the engine to a Transmission Controller (TCU) after the engine is stopped.
After receiving a stop state signal of an engine, a Transmission Control Unit (TCU) judges a starting condition; after the starting condition of a Transmission Controller (TCU) is judged, when the starting condition is determined to be met, a start permission mark is sent to an Engine Controller (ECU) so that the Engine Controller (ECU) can control the engine to start.
Wherein, the starting conditions include but are not limited to: whether the output pressure of the electronic oil pump meets the action requirements of a preset clutch action and a preset gear synchronizer or not; whether the electronic oil pump and the odd-numbered clutch enter the set state, etc., during the predicted vehicle start time T.
Specifically, road feel information is obtained from other controllers of the vehicle, and the vehicle starting time of the next starting of the vehicle is predicted according to the road feel information; the road feeling information includes, but is not limited to, map information, traffic light states, front vehicle positions and the like; the vehicle starting time is the time interval T between the start of the current stop of the engine and the next start of the engine, which is calculated in real time.
A Transmission Control Unit (TCU) controls an electronic oil pump and a preset clutch to set states according to vehicle starting time; the set state is a work preparation state of the electronic oil pump and the preset clutch for quick power transmission after the engine is started when the vehicle is started quickly.
And after determining that the electronic oil pump and the preset clutch enter the set state, the Transmission Control Unit (TCU) sends a start permission flag to an Engine Control Unit (ECU) so as to send the start permission flag to control the engine to start according to the start permission flag.
And D30, receiving the start permission flag, and controlling the engine to start according to the start permission flag.
In the embodiment, a start permission flag of a Transmission Controller (TCU) is received, and the engine is controlled to start according to the start permission flag; therefore, the response time in vehicle starting control is shortened, and the drivability under the rapid starting working condition is improved.
In the embodiment, a stop signal is sent to the gearbox controller so that the gearbox controller can judge stop conditions, when the stop conditions are met, the double-clutch automatic gearbox is controlled to be disconnected from a vehicle transmission chain, and after the fact that the vehicle transmission chain is in a disconnected state is determined, a stop permission mark is sent to the engine controller; when the stop permission mark is received, controlling the engine to stop, sending a stop state signal of the engine to the gearbox controller for the gearbox controller to judge the starting condition, and sending the start permission mark to the engine controller when the starting condition is met; receiving a start permission flag, and controlling the engine to start according to the start permission flag; therefore, the response time in vehicle starting control is shortened, and the driving performance under the rapid starting working condition is improved.
The invention also provides a vehicle start-stop control device. Referring to fig. 9, the vehicle start-stop control apparatus of the present invention includes:
the judging module 10 is used for controlling the double-clutch automatic gearbox to be disconnected from a vehicle transmission chain if the stopping condition is met after a stopping signal of an engine controller is received;
a control module 20 for sending a stop permission flag to the engine controller for the engine controller to control engine stop;
the sending module 30 is configured to send a start permission flag to the engine controller after receiving the stop state signal sent by the engine controller and if a start condition is met, so that the engine controller controls the engine to start.
In addition, the present invention also provides a medium, which is a computer readable storage medium, on which a vehicle start-stop control program is stored, and the vehicle start-stop control program, when executed by a processor, implements the steps of the vehicle start-stop control method as described above.
The method implemented when the vehicle start-stop control program running on the processor is executed may refer to each embodiment of the vehicle start-stop control method of the present invention, and details are not repeated here.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of other like elements in a process, method, article, or system comprising the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention or the portions contributing to the prior art may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) as described above and includes several instructions for enabling a terminal device (which may be a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. A vehicle start-stop control method is applied to a gearbox controller and comprises the following steps:
after a stop signal of an engine controller is received, if a stop condition is met, the double-clutch automatic gearbox is controlled to be disengaged from a vehicle transmission chain;
sending a stop permission flag to the engine controller for the engine controller to control the engine to stop;
after a stop state signal sent by the engine controller is received, if a starting condition is met, a start permission mark is sent to the engine controller, so that the engine controller can control the engine to start.
2. The vehicle start-stop control method according to claim 1, wherein the twin-clutch automatic transmission comprises an odd clutch and an even clutch, and the step of controlling the twin-clutch automatic transmission to disengage the vehicle transmission chain if a stop condition is met after the stop signal is received comprises:
after the stop signal is received, timing by using a timer, and judging whether the double-clutch automatic gearbox is in a failure mode;
if not, judging whether the double-clutch automatic gearbox is in a self-learning process or not;
if not, respectively acquiring characteristic parameters and oil temperature signals of the odd-numbered clutch and the even-numbered clutch, and calculating corresponding half-joint pressure and pressure deviation values according to the characteristic parameters and the oil temperature signals; calculating a difference between the half-junction pressure and the pressure offset value, and controlling the pressures of both the odd clutch and the even clutch to the difference;
judging whether a preset gear synchronizer is in a gear or not;
if not, picking off the rest gear synchronizer, and controlling the preset gear synchronizer to execute the gear engaging operation;
acquiring the timing time of the timer, and judging whether the timing time is greater than a preset time limit value;
if not, the preset gear synchronizer is controlled to execute gear engaging operation until the preset gear synchronizer finishes gear engaging, and the double-clutch automatic gearbox is controlled to be disengaged from the vehicle transmission chain.
3. The vehicle start-stop control method of claim 1, after the step of receiving a stop signal from an engine controller, further comprising:
and sending a stop prohibition flag to the engine controller when the stop condition is not met.
4. The vehicle start-stop control method of claim 1, wherein after the step of sending a stop-allowed flag to the engine controller for the engine controller to control engine stop, further comprising:
after the stop permission mark is sent to the engine controller, the corresponding first pressure is determined according to the control requirement of the preset clutch, and the output pressure of the electronic oil pump is controlled to be the first pressure so as to meet the control requirement of the oil filling action of the preset clutch.
5. The vehicle start-stop control method of claim 1, wherein the step of sending a start-enabling flag to the engine controller if a start condition is met after receiving a stop status signal sent by the engine controller comprises:
after the stop state signal of the engine is received, controlling a preset gear synchronizer to be in a gear, and controlling the rest gear synchronizers not to act;
acquiring map information, a current traffic light state and a front vehicle position, and predicting vehicle starting time according to the map information, the current traffic light state and the front vehicle position;
and controlling the electronic oil pump and the preset clutch to enter a set state according to the vehicle starting time, and sending a start permission mark to the engine controller after determining that the electronic oil pump and the preset clutch enter the set state.
6. The vehicle start-stop control method according to claim 5, wherein the step of controlling the electronic oil pump and the preset clutch to enter the set state according to the vehicle start time comprises:
when the timer reaches a first moment before the vehicle starting time, determining a corresponding second pressure according to the control requirements of the preset clutch and the preset gear synchronizer, and controlling the output pressure of the electronic oil pump to be the second pressure so as to meet the control requirements of the action of the preset clutch and the action of the preset gear synchronizer;
and when the timer reaches a second moment before the vehicle starting time, controlling the pressure of the preset clutch to be half-joint point pressure, and controlling the electronic oil pump and the preset clutch to enter a set state.
7. A vehicle start-stop control method is applied to an engine controller and comprises the following steps:
sending a stop signal to a transmission controller, so that the transmission controller controls the dual-clutch automatic transmission to disconnect a vehicle transmission chain and sends a stop permission sign to the engine controller if the stop condition is met after receiving the stop signal of the engine controller;
receiving a stop permission flag sent by the gearbox controller, controlling an engine to stop according to the stop permission flag, and sending a stop state signal of the engine to the gearbox controller, so that the gearbox controller sends a start permission flag to the engine controller if a start condition is met after receiving the stop state signal sent by the engine controller;
and receiving the start permission flag, and controlling the engine to start according to the start permission flag.
8. A vehicle start-stop control system, characterized by comprising:
the engine controller is used for sending a stop signal to the gearbox controller;
the gearbox controller is used for controlling the double-clutch automatic gearbox to be disconnected from a vehicle transmission chain if the stop condition is met after the stop signal is received; sending a shutdown allowed flag to the engine controller;
the engine controller is used for receiving the stop permission mark, controlling the engine to stop according to the stop permission mark and sending a stop state signal of the engine to the gearbox controller;
the transmission controller is used for sending a start permission mark to the engine controller if a start condition is met after a stop state signal sent by the engine controller is received;
and the engine controller is used for receiving the start permission flag and controlling the engine to start according to the start permission flag.
9. An apparatus, the apparatus is a vehicle start stop control apparatus, characterized in that the vehicle start stop control apparatus comprises: memory, a processor and a vehicle start-stop control program stored on the memory and executable on the processor, the vehicle start-stop control program when executed by the processor implementing the steps of the vehicle start-stop control method according to any one of claims 1 to 7.
10. A medium being a computer readable storage medium, characterized in that the computer readable storage medium has stored thereon a vehicle start stop control program, which when executed by a processor implements the steps of the vehicle start stop control method according to any one of claims 1 to 7.
CN202211031958.8A 2022-08-26 2022-08-26 Vehicle start-stop control method, system, equipment and medium Pending CN115325158A (en)

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CN107284435A (en) * 2017-05-17 2017-10-24 吉利汽车研究院（宁波）有限公司 The engine intelligent on-off control method and system interacted based on vehicle with transport information
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050061599A1 (en) * 2002-03-07 2005-03-24 Luk Lamellen Und Kupplungsbau Beteiligungs Kg Method for adapting the clutch characteristics in a twin-clutch system
US20120022718A1 (en) * 2010-07-22 2012-01-26 Gm Global Technology Operations, Inc. Method of controlling start/stop of a vehicle at a traffic light
WO2014038297A1 (en) * 2012-09-10 2014-03-13 日産自動車株式会社 Idle stop control device for vehicle equipped with automatic manual transmission
CN106476791A (en) * 2015-08-23 2017-03-08 郝明学 The control method of the automatic start-stop system of engine of reference arm lipstick lamp stand-by period
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