CN114439625A - 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 PDFInfo
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- CN114439625A CN114439625A CN202210073175.XA CN202210073175A CN114439625A CN 114439625 A CN114439625 A CN 114439625A CN 202210073175 A CN202210073175 A CN 202210073175A CN 114439625 A CN114439625 A CN 114439625A
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 230000005540 biological transmission Effects 0.000 claims abstract description 14
- 238000001914 filtration Methods 0.000 claims abstract description 12
- 230000001133 acceleration Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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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
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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
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Transmission Device (AREA)
Abstract
The invention discloses a method for improving the torque response speed of a vehicle in a wheel end torque control mode, which comprises the following steps: the gearbox controller sends the current actual gear, the target gear, the gear shifting process state, the effective gear shifting state and the effective transmission chain speed ratio information of the transmission to a CAN bus; the engine management system controller receives the information and judges whether the current driving working condition enters a power upshift working condition or not by combining the running state of the engine management system controller; meanwhile, the change rate of the opening degree of the electronic accelerator pedal is monitored, and whether the accelerator is suddenly released or stepped is judged; when the vehicle is judged to be in the power upshift working condition and no accelerator is suddenly loosened or stepped on, the driving filtering function is closed; and when the situation that the vehicle exits the power upshift working condition, or the accelerator is suddenly loosened, or the accelerator is suddenly stepped is judged, the driving filtering function is turned on. The invention improves the response speed of the engine to the torque demand in the process of the vehicle in power upshift and solves the problem of poor drivability caused by the torque demand.
Description
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 current drivability filtering strategy of the vehicle in the wheel end torque control mode is the same as that in the previous multi-gear accelerator map mode, namely, the drivability filtering function is turned on under all driving conditions. The existence of the driving filtering function can influence the response speed of the engine to the torque requirement inevitably, and the engine is required to increase the torque as far as possible along with the change of the speed ratio value of the gearbox in the acceleration process of the vehicle when the driver steps on the accelerator under the wheel end torque control mode, so that the smoothness of the vehicle in the acceleration process is ensured. Therefore, a control strategy for closing the drivability filter function under the working condition is provided, but the problem of drivability deterioration under some working conditions is caused by closing the drivability filter function, so that the corresponding strategy needs to be designed to control the closing and re-opening time of the drivability filter function.
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 during a power upshift of the vehicle and solve the problem of poor drivability caused by the response speed.
The invention discloses a method for improving the 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 the current actual gear, the target gear, the gear shifting process state, the effective gear shifting state and the effective transmission chain speed ratio information 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 or not by combining 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 the driver has the operation of suddenly releasing the accelerator or suddenly stepping on the accelerator or not on the basis of the change rate of the opening of the electronic accelerator pedal;
when the vehicle is judged to be in the power upshift working condition and no operation of suddenly releasing or stepping on the accelerator is performed, the driving filtering function is closed; and when the vehicle is judged to exit the power upshift working condition, or the accelerator is suddenly loosened, or the accelerator is suddenly stepped on, the drivability filtering function is turned on.
Alternatively, when the following conditions (1) to (8) are simultaneously met, the engine management system controller judges 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 opening degree value of the electronic accelerator pedal is greater than a preset pedal opening degree threshold value;
(3) the target gear position value sent by the gearbox is larger than the actual gear position value;
(4) the gear shifting process state sent by the gearbox represents that the current gearbox is in a gear shifting process;
(5) the gear shifting process state information sent by the gearbox is effective;
(6) the transmission chain speed ratio 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.
Alternatively, when the following condition (1) and condition (2) are simultaneously met, the engine management system controller judges that the driver does not have the operation of suddenly releasing the accelerator or suddenly stepping on the accelerator;
(1) the opening degree change rate of the electronic accelerator pedal is greater than a preset lower limit value K1；
(2) The opening degree change rate of the electronic accelerator pedal is less than a preset upper limit value K2。
Optionally, when the engine management system controller judges that the vehicle enters a power upshift working condition, the flag M is set to True;
when the engine management system controller judges that the electronic accelerator pedal opening degree change rate is larger than a preset lower limit value K1Time, flag bit N1Setting True;
when the engine management system controller judges that the electronic accelerator pedal opening degree change rate is smaller than a preset upper limit value K2Time, flag bit N2Setting True;
when flag M, N1 and N2 are simultaneously set True, the engine management system controller turns off the drivability filter function.
Optionally, when the electronic accelerator pedal opening degree change rate is smaller than a preset lower limit value K1, the mark is usedBit N1Putting False for a period of time T1；
When the opening degree change rate of the electronic accelerator pedal is greater than a preset upper limit value K2Then, the flag bit N is set2Putting False for a period of time T2Wherein: t is a unit of1、T2And calibrating based on the opening of the electronic accelerator pedal and the current actual gear.
The invention has the advantages that the invention improves the response speed of the engine to the torque demand in the process of the vehicle in the power upshift process and solves the problem of the driving deterioration caused by the response speed.
Drawings
FIG. 1 is a schematic illustration of a cooling system of a naturally aspirated engine carrying a manual transmission;
FIG. 2 is a graph showing the characteristics of TMM monomer in this example;
FIG. 3 is a schematic diagram of the control situation of the water temperature of the whole vehicle during running by applying the method;
fig. 4 is a flowchart of the present embodiment.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 4, in the present embodiment, a method for increasing 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 the current actual gear, the target gear, the gear shifting process state, the effective gear shifting state and the effective transmission chain speed ratio information 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 or not by combining 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 the driver has the operation of suddenly releasing the accelerator or suddenly stepping on the accelerator or not on the basis of the change rate of the opening of the electronic accelerator pedal;
when the vehicle is judged to be in the power upshift working condition and no operation of suddenly releasing or stepping on the accelerator is performed, the driving filtering function is closed; and when the vehicle is judged to exit the power upshift working condition, or the accelerator is suddenly loosened, or the accelerator is suddenly stepped on, the drivability filtering function is turned on.
The implementation of the control method depends on the timeliness of signals such as an actual gear, a target gear, a gear shifting process state effective and a transmission chain speed ratio value effective 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 begins 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 the embodiment, 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 opening degree value of the electronic accelerator pedal is greater than a preset pedal opening degree threshold value;
(3) the target gear position value sent by the gearbox is larger than the actual gear position value;
(4) the gear shifting process state sent by the gearbox represents that the current gearbox is in a gear shifting process;
(5) the gear shifting process state information sent by the gearbox is effective;
(6) the transmission chain speed ratio 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 the embodiment, when the following condition (1) and condition (2) are simultaneously met, the engine management system controller judges that the driver does not have the operation of suddenly loosening the accelerator or suddenly stepping on the accelerator;
(1) the opening degree change rate of the electronic accelerator pedal is greater than a preset lower limit value K1；
(2) The electronic accelerator pedal opening degree change rate is less than a preset upper limit value K2。
Optionally, when the engine management system controller judges that the vehicle enters a power upshift working condition, the flag M is set to True;
when the engine management system controller judges that the electronic accelerator pedal opening degree change rate is larger than a preset lower limit value K1(negative value), flag bit N1Setting True;
when the engine management system controller judges that the electronic accelerator pedal opening degree change rate is smaller than a preset upper limit value K2At (positive value), flag bit N2Setting True;
when the flag M, N1 and the N2 are set True simultaneously, the engine management system controller turns off the drivability filter function, increasing the speed of the engine response to the required torque.
However, the electronic accelerator pedal opening rate is a transient variation (a value is large in a short time and then returns to zero rapidly), when a driver operates to suddenly release the accelerator and step on the accelerator, the time for the electronic accelerator pedal opening rate to exceed the range is only dozens of milliseconds, and the drivability filter function is correspondingly opened for dozens of milliseconds, so that the problem of impact vibration still exists. Therefore, when the opening degree change rate of the electronic accelerator pedal is smaller than the preset lower limit value K1, the flag bit N is required to be set1Putting False for a period of time T1(ii) a When the opening degree change rate of the electronic accelerator pedal is greater than a preset upper limit value K2Then, the flag bit N is set2Putting False for a period of time T2Wherein: t is a unit of1、T2And calibrating based on the opening of the electronic accelerator pedal and the current actual gear.
As shown in fig. 3 and 4, which represent the torque response speed of the engine with and without the torque response speed ramp-up strategy, it is apparent that the torque value of the engine output can more quickly follow the change in the drive train speed ratio with the torque response speed ramp-up strategy.
Claims (5)
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 the current actual gear, the target gear, the gear shifting process state, the effective gear shifting state and the effective transmission chain speed ratio information 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 or not by combining 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 the driver has the operation of suddenly releasing the accelerator or suddenly stepping on the accelerator or not on the basis of the change rate of the opening of the electronic accelerator pedal;
when the vehicle is judged to be in the power upshift working condition and no operation of suddenly releasing or stepping on the accelerator is performed, the driving filtering function is closed; and when the vehicle is judged to exit the power upshift working condition, or the accelerator is suddenly loosened, or the accelerator is suddenly stepped on, the drivability filtering function is turned on.
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 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 opening degree value of the electronic accelerator pedal is greater than a preset pedal opening degree threshold value;
(3) the target gear position value sent by the gearbox is larger than the actual gear position value;
(4) the gear shifting process state sent by the gearbox represents that the current gearbox is in a gear shifting process;
(5) the gear shifting process state information sent by the gearbox is effective;
(6) the transmission chain speed ratio 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.
3. The method of increasing torque response speed of a vehicle in a wheel end torque control mode according to claim 1 or 2, characterized by:
when the following condition (1) and the condition (2) are simultaneously met, the engine management system controller judges that the driver does not have the operation of suddenly loosening the accelerator or suddenly stepping on the accelerator;
(1) the opening degree change rate of the electronic accelerator pedal is greater than a preset lower limit value K1；
(2) The opening degree change rate of the electronic accelerator pedal is less than a preset upper limit value K2。
4. The method of increasing torque response speed of a vehicle in a wheel end torque control mode of claim 3, wherein: when the engine management system controller judges that the vehicle enters a power upshift working condition, the flag bit M is set to True;
when the engine management system controller judges that the electronic accelerator pedal opening degree change rate is larger than a preset lower limit value K1Time, flag bit N1Setting True;
when the engine management system controller judges that the electronic accelerator pedal opening degree change rate is smaller than a preset upper limit value K2Time, flag bit N2Setting True;
when flag M, N1 and N2 are simultaneously set True, the engine management system controller turns off the drivability filter function.
5. The method of increasing torque response speed of a vehicle in a wheel end torque control mode of claim 4, wherein:
when the opening degree change rate of the electronic accelerator pedal is smaller than a preset lower limit value K1, setting a flag bit N1Putting False for a period of time T1；
When the opening degree change rate of the electronic accelerator pedal is greater than a preset upper limit value K2Then, the flag bit N is set2Putting False for a period of time T2Wherein: t is1、T2And calibrating based on the opening of the electronic accelerator pedal and the current actual gear.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210073175.XA CN114439625B (en) | 2022-01-21 | 2022-01-21 | Method for improving torque response speed of vehicle in wheel end torque control mode |
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| CN202210073175.XA CN114439625B (en) | 2022-01-21 | 2022-01-21 | Method for improving torque response speed of vehicle in wheel end torque control mode |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115075959A (en) * | 2022-08-04 | 2022-09-20 | 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 |
| CN115653771A (en) * | 2022-10-28 | 2023-01-31 | 重庆长安汽车股份有限公司 | Control method and system for optimizing engine torque response in gear-up process |
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| CN115653771A (en) * | 2022-10-28 | 2023-01-31 | 重庆长安汽车股份有限公司 | Control method and system for optimizing engine torque response in gear-up process |
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