CN114439625B - Method for improving torque response speed of vehicle in wheel end torque control mode - Google Patents

Method for improving torque response speed of vehicle in wheel end torque control mode Download PDF

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Publication number
CN114439625B
CN114439625B CN202210073175.XA CN202210073175A CN114439625B CN 114439625 B CN114439625 B CN 114439625B CN 202210073175 A CN202210073175 A CN 202210073175A CN 114439625 B CN114439625 B CN 114439625B
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China
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vehicle
management system
accelerator pedal
system controller
working condition
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CN202210073175.XA
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CN114439625A (en
Inventor
张兴健
阙建
张文海
杨方子
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Chongqing Changan Automobile Co Ltd
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Chongqing Changan Automobile Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
    • F02D29/02—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
    • 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
    • F02D2200/00—Input parameters for engine control
    • F02D2200/50—Input parameters for engine control said parameters being related to the vehicle or its components
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/60—Input parameters for engine control said parameters being related to the driver demands or status
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/60—Input parameters for engine control said parameters being related to the driver demands or status
    • F02D2200/602—Pedal position

Abstract

The invention discloses a method for improving torque response speed of a vehicle in a wheel end torque control mode, which comprises the following steps: the gearbox controller sends effective information of the current actual gear, the target gear, the gear shifting progress state, the gear shifting state and the transmission chain speed ratio value of the transmission to the CAN bus; the engine management system controller receives the information and judges whether the current driving working condition enters a power upshift working condition according to the running state of the engine management system controller; meanwhile, the change rate of the opening of the electronic accelerator pedal is monitored, and whether the accelerator is suddenly released or suddenly stepped is judged; when the vehicle is judged to be in a power upshift working condition and does not have an abrupt release of the accelerator or an abrupt stepping of the accelerator, the drivability filtering function is closed; and when the vehicle is judged to exit the power upshift working condition, or the accelerator is suddenly released, or the accelerator is suddenly stepped on, the drivability filtering function is turned on. The invention improves the response speed of the engine to the torque demand in the power upshift process of the vehicle and solves the problem of driving deterioration caused by the response speed.

Description

Method for improving torque response speed of vehicle in wheel end torque control mode
Technical Field
The invention relates to the technical field of engine management systems, in particular to a method for improving torque response speed of a vehicle in a wheel end torque control mode.
Background
The driving filtering strategy of the current vehicle in the wheel end torque control mode is the same as that in the previous multi-gear accelerator map mode, namely, the driving filtering function is turned on under all driving conditions. The existence of the drivability filtering function can necessarily influence the response speed of the engine to the torque demand, and in the acceleration process of the vehicle when the driver steps on the accelerator in the wheel end torque control mode, the engine is required to increase torque along with the change of the speed ratio of the gearbox as much as possible so as to ensure the smoothness in the acceleration process of the vehicle. Therefore, a control strategy for turning off the drivability filtering function under the working condition is proposed, but turning off the drivability filtering function causes a problem of deterioration of drivability under some working conditions, so that a corresponding strategy needs to be designed to control the timing of turning off and on the drivability filtering function again.
Disclosure of Invention
The invention aims to provide a method for improving the torque response speed of a vehicle in a wheel end torque control mode, so as to improve the response speed of an engine to a torque demand in a power upshift process of the vehicle and solve the problem of driving deterioration caused by the response speed.
The invention relates to a method for improving torque response speed of a vehicle in a wheel end torque control mode, which comprises the following steps:
in the running process of the vehicle, the gearbox controller sends effective information of the current actual gear, the target gear, the gear shifting progress state, the gear shifting state and the transmission chain speed ratio value of the transmission to the CAN bus;
the engine management system controller receives information sent by the gearbox controller and judges whether the current driving working condition enters a power upshift working condition according to the running state of the engine management system controller; meanwhile, an engine management system controller monitors the change rate of the opening of the electronic accelerator pedal and judges whether a driver has an operation of suddenly releasing the accelerator or suddenly stepping on the accelerator based on the change rate of the opening of the electronic accelerator pedal;
when the vehicle is judged to be in a power upshift working condition and the operation of suddenly releasing the accelerator or suddenly stepping on the accelerator is not carried out, the drivability filtering function is closed; and when the vehicle is judged to exit the power upshift working condition, or the accelerator is suddenly released, or the accelerator is suddenly stepped on, the drivability filtering function is turned on.
Optionally, when the following conditions (1) to (8) are simultaneously satisfied, the engine management system controller determines that the vehicle enters a power upshift working condition;
(1) The actual torque value of the engine is larger than a power upshift working condition identification torque threshold value set based on the opening value of the electronic accelerator pedal;
(2) The electronic accelerator pedal opening value is larger than a preset pedal opening threshold value;
(3) The target gear value sent by the gearbox is larger than the actual gear value;
(4) The gear shifting progress state sent by the gearbox indicates that the current gearbox is in the gear shifting progress;
(5) The gear shifting progress state information sent by the gearbox is effective;
(6) The transmission chain speed ratio value sent by the gearbox is effective;
(7) The target gear sent by the gearbox is effective;
(8) The actual gear sent by the gearbox is valid.
Optionally, when the following condition (1) and condition (2) are satisfied simultaneously, the engine management system controller determines that the driver does not have an accelerator release or accelerator pedal operation;
(1) The opening change rate of the electronic accelerator pedal is larger than a preset lower limit value K 1 ；
(2) The opening change rate of the electronic accelerator pedal is smaller than a preset upper limit value K 2 。
Optionally, when the engine management system controller judges that the vehicle enters a power upshift working condition, the marker position M is set to True;
when the engine management system controller judges that the opening change rate of the electronic accelerator pedal is larger than the preset lower limit value K 1 At the time, bit N 1 Placing True;
when the engine management system controller judges that the opening change rate of the electronic accelerator pedal is smaller than the preset upper limit value K 2 At the time, bit N 2 Placing True;
when the flags M, N and N2 are simultaneously True, the engine management system controller turns off the drivability filtering function.
Optionally, when the electronic accelerator pedal opening change rate is smaller than the preset lower limit value K1, the zone bit N is set 1 Setting False for a period of time T 1 ；
When the opening change rate of the electronic accelerator pedal is larger than the preset upper limit value K 2 At the time, the flag bit N 2 Setting False for a period of time T 2 Wherein: t (T) 1 、T 2 And calibrating based on the opening of the electronic accelerator pedal and the current actual gear.
The invention has the advantages that the response speed of the engine to the torque demand in the process of power upshift of the vehicle is improved, and the problem of driving performance deterioration caused by the response speed is solved.
Drawings
FIG. 1 is a schematic diagram of a cooling system for a naturally aspirated engine carrying a manual transmission;
FIG. 2 is a graph showing TMM monomer characteristics in this example;
FIG. 3 is a schematic diagram of the control of water temperature during running of the whole vehicle using the method;
fig. 4 is a flowchart of the present embodiment.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 4, in this embodiment, a method for improving a torque response speed of a vehicle in a wheel end torque control mode includes the following steps:
in the running process of the vehicle, the gearbox controller sends effective information of the current actual gear, the target gear, the gear shifting progress state, the gear shifting state and the transmission chain speed ratio value of the transmission to the CAN bus;
the engine management system controller receives information sent by the gearbox controller and judges whether the current driving working condition enters a power upshift working condition according to the running state of the engine management system controller; meanwhile, an engine management system controller monitors the change rate of the opening of the electronic accelerator pedal and judges whether a driver has an operation of suddenly releasing the accelerator or suddenly stepping on the accelerator based on the change rate of the opening of the electronic accelerator pedal;
when the vehicle is judged to be in a power upshift working condition and the operation of suddenly releasing the accelerator or suddenly stepping on the accelerator is not carried out, the drivability filtering function is closed; and when the vehicle is judged to exit the power upshift working condition, or the accelerator is suddenly released, or the accelerator is suddenly stepped on, the drivability filtering function is turned on.
The implementation of the control method depends on timeliness of signals such as an actual gear, a target gear, a gear shifting progress state effective, a transmission chain speed ratio value effective and the like sent by a gearbox controller, an engine management system controller needs to judge that a vehicle enters a power upshift working condition according to the information before the transmission chain speed ratio value sent by the gearbox controller starts to change, then the operation of closing a drivability filtering function is executed, and the time sequence requirements among the signals are shown in figure 2.
In this embodiment, when the following conditions (1) to (8) are simultaneously satisfied, the engine management system controller determines that the vehicle enters a power upshift condition;
(1) The actual torque value of the engine is larger than a power upshift working condition identification torque threshold value set based on the opening value of the electronic accelerator pedal;
(2) The electronic accelerator pedal opening value is larger than a preset pedal opening threshold value;
(3) The target gear value sent by the gearbox is larger than the actual gear value;
(4) The gear shifting progress state sent by the gearbox indicates that the current gearbox is in the gear shifting progress;
(5) The gear shifting progress state information sent by the gearbox is effective;
(6) The transmission chain speed ratio value sent by the gearbox is effective;
(7) The target gear sent by the gearbox is effective;
(8) The actual gear sent by the gearbox is valid.
In this embodiment, when the following condition (1) and condition (2) are satisfied at the same time, the engine management system controller determines that the driver does not have an accelerator release or accelerator pedal operation;
(1) The opening change rate of the electronic accelerator pedal is larger than a preset lower limit value K 1 ；
(2) The opening change rate of the electronic accelerator pedal is smaller than a preset upper limit value K 2 。
Optionally, when the engine management system controller judges that the vehicle enters a power upshift working condition, the marker position M is set to True;
when the engine management system controller judges that the opening change rate of the electronic accelerator pedal is larger than the preset lower limit value K 1 (negative value) flag bit N 1 Placing True;
when the engine management system controller judges that the opening change rate of the electronic accelerator pedal is smaller than the preset upper limit value K 2 (positive value) the flag bit N 2 Placing True;
when the flag bits M, N and N2 are set to True simultaneously, the engine management system controller turns off the drivability filtering function, and the response speed of the engine to the required torque is improved.
However, the opening rate of the electronic accelerator pedal is a transient change amount (the numerical value is very large in a short time and returns to zero quickly), when the driver has the operations of suddenly releasing the accelerator and suddenly stepping on the accelerator, the time of the electronic accelerator pedal in the out-of-range is only tens of milliseconds, and the drivability filtering function is correspondingly opened for tens of milliseconds, so that the problem of impact vibration still exists. Therefore, when the opening change rate of the electronic accelerator pedal is smaller than the preset lower limit value K1, the zone bit N is needed 1 Setting False for a period of time T 1 The method comprises the steps of carrying out a first treatment on the surface of the When the opening change rate of the electronic accelerator pedal is larger than the preset upper limit value K 2 At the time, the flag bit N 2 Setting False for a period of time T 2 Wherein: t (T) 1 、T 2 And calibrating based on the opening of the electronic accelerator pedal and the current actual gear.
As shown in fig. 3 and 4, which show the condition of the engine torque response speed with and without the torque response speed increasing strategy, it is apparent that the torque value output by the engine with the torque response speed increasing strategy can follow the change of the transmission speed ratio value more quickly.

Claims (4)

1. A method of increasing torque response speed of a vehicle in a wheel end torque control mode, comprising the steps of:
in the running process of the vehicle, the gearbox controller sends effective information of the current actual gear, the target gear, the gear shifting progress state, the gear shifting state and the transmission chain speed ratio value of the transmission to the CAN bus;
the engine management system controller receives information sent by the gearbox controller and judges whether the current driving working condition enters a power upshift working condition according to the running state of the engine management system controller; meanwhile, an engine management system controller monitors the change rate of the opening of the electronic accelerator pedal and judges whether a driver has an operation of suddenly releasing the accelerator or suddenly stepping on the accelerator based on the change rate of the opening of the electronic accelerator pedal;
when the vehicle is judged to be in a power upshift working condition and the operation of suddenly releasing the accelerator or suddenly stepping on the accelerator is not carried out, the drivability filtering function is closed; when the vehicle is judged to exit the power upshift working condition, or the accelerator is suddenly released, or the accelerator is suddenly stepped on, the drivability filtering function is turned on;
when the following conditions (1) to (8) are simultaneously met, the engine management system controller judges that the vehicle enters a power upshift working condition;
(1) The actual torque value of the engine is larger than a power upshift working condition identification torque threshold value set based on the opening value of the electronic accelerator pedal;
(2) The electronic accelerator pedal opening value is larger than a preset pedal opening threshold value;
(3) The target gear value sent by the gearbox is larger than the actual gear value;
(4) The gear shifting progress state sent by the gearbox indicates that the current gearbox is in the gear shifting progress;
(5) The gear shifting progress state information sent by the gearbox is effective;
(6) The transmission chain speed ratio value sent by the gearbox is effective;
(7) The target gear sent by the gearbox is effective;
(8) The actual gear sent by the gearbox is valid.
2. The method of increasing torque response speed of a vehicle in a wheel end torque control mode of claim 1, wherein:
when the following condition (1) and the following condition (2) are simultaneously met, the engine management system controller judges that the driver does not have the operation of suddenly releasing the throttle or suddenly stepping on the throttle;
(1) The opening change rate of the electronic accelerator pedal is larger than a preset lower limit value K 1 ；
(2) The opening change rate of the electronic accelerator pedal is smaller than a preset upper limit value K 2 。
3. The method of boosting torque response speed of a vehicle in a wheel end torque control mode of claim 2, wherein: when the engine management system controller judges that the vehicle enters a power upshift working condition, the marker position M is positioned True;
when the engine management system controller judges that the opening change rate of the electronic accelerator pedal is larger than the preset lower limit value K 1 At the time, bit N 1 Placing True;
when the engine management system controller judges that the opening change rate of the electronic accelerator pedal is smaller than the preset upper limit value K 2 At the time, bit N 2 Placing True;
when the flags M, N and N2 are simultaneously True, the engine management system controller turns off the drivability filtering function.
4. A method of boosting torque response speed of a vehicle in a wheel end torque control mode as claimed in claim 3 wherein:
when the opening change rate of the electronic accelerator pedal is smaller than the preset lower limit value K1, the zone bit N is set 1 Setting False for a period of time T 1 ；
When the opening change rate of the electronic accelerator pedal is larger than the preset upper limit value K 2 At the time, the flag bit N 2 Setting False for a period of time T 2 Wherein: t (T) 1 、T 2 And calibrating based on the opening of the electronic accelerator pedal and the current actual gear.
CN202210073175.XA 2022-01-21 2022-01-21 Method for improving torque response speed of vehicle in wheel end torque control mode Active CN114439625B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115075959B (en) * 2022-08-04 2024-02-20 潍柴动力股份有限公司 Vehicle filtering time adjusting method and device
CN115478944A (en) * 2022-09-26 2022-12-16 潍柴动力股份有限公司 Vehicle engine control method and device, electronic equipment and storage medium

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CN111942353A (en) * 2020-07-22 2020-11-17 东风汽车集团有限公司 Emergency braking control method for pure electric vehicle, vehicle control unit and control device
CN113291163A (en) * 2021-06-28 2021-08-24 重庆长安汽车股份有限公司 Torque control method and system of automatic transmission automobile and automobile

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Publication number Priority date Publication date Assignee Title
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KR20060056149A (en) * 2004-11-19 2006-05-24 현대자동차주식회사 Power on up shift control method of automatic transmission on vehicle
JP2007291895A (en) * 2006-04-21 2007-11-08 Toyota Motor Corp Control device for vehicle
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