CN-122014766-A - Method and system for self-learning of clutch torque of P2 hybrid commercial vehicle

CN122014766ACN 122014766 ACN122014766 ACN 122014766ACN-122014766-A

Abstract

The invention belongs to the technical field of automobiles, and relates to a method and a system for self-learning of clutch torque of a P2 hybrid commercial vehicle. After the motor and the engine are started, the rotation speeds of the motor and the engine are controlled to be stabilized at corresponding target rotation speeds. And then, controlling the clutch to be closed, controlling the rotating speed of the engine to be maintained at the target rotating speed of the engine in the clutch closing process, acquiring the motor angular acceleration, the motor torque, the motor moment of inertia and the clutch displacement in real time, and acquiring the torque transmitted by the clutch according to the motor angular acceleration, the motor torque and the motor moment of inertia. And after the motor torque reaches a set torque threshold, a clutch torque transmission curve is formed according to the clutch displacement and the torque transmitted by the clutch. The invention can accurately calculate the torque transmitted by the clutch and form an accurate torque transmission curve, ensures the smoothness of power connection before and after gear shifting of the vehicle, and realizes full automation of the whole self-learning process.

Inventors

Lan Haichao
ZHANG ZHEN
LUO GUANGTAO
GUO WEIFENG
WANG SHENG

Assignees

西安法士特汽车传动有限公司

Dates

Publication Date: 20260512
Application Date: 20260206

Claims (10)

1. The method for self-learning the clutch torque of the P2 hybrid commercial vehicle is characterized by comprising the following steps of: responding to a clutch torque self-learning function activation instruction triggered when the vehicle is in a parking static state and the gear is in N gear, sending a motor starting instruction, and after the motor is started, driving an engine to be started by the motor through a clutch; after the engine is started, a clutch release instruction is sent; after the clutch is separated, controlling the rotating speed of the motor to be stabilized at the target rotating speed of the motor, and controlling the rotating speed of the engine to be stabilized at the target rotating speed of the engine; Controlling the clutch to be closed, controlling the rotating speed of the engine to be maintained at the target rotating speed of the engine in the clutch closing process, acquiring the angular acceleration of the motor, the torque of the motor, the moment of inertia of the motor and the displacement of the clutch in real time, and acquiring the torque transmitted by the clutch according to the angular acceleration of the motor, the torque of the motor and the moment of inertia of the motor; And after the motor torque reaches a set torque threshold, a clutch torque transmission curve is formed according to the clutch displacement and the torque transmitted by the clutch.
2. The method for self-learning clutch torque of a P2 hybrid commercial vehicle according to claim 1, wherein the step of sending a motor start command in response to a clutch torque self-learning function activation command triggered when the vehicle is in a stationary parking state and a gear is in N-gear, the motor driving an engine to start through a clutch after the motor is started, comprises: Responding to a clutch torque self-learning function activation instruction triggered when the vehicle is in a parking static state and the gear is in N gear, and sending an override control request to the whole vehicle controller by the hybrid transmission controller; After receiving override control permission from the whole vehicle controller, the hybrid transmission controller takes over the whole vehicle controller to obtain control permission for an engine controller and a motor controller; the hybrid transmission controller sends a target torque command of a motor to the motor controller; the motor controller controls the motor to start, controls the motor to output torque according to the target torque command, and enables the motor to start the engine through the clutch.
3. The method for self-learning clutch torque of a P2 hybrid commercial vehicle according to claim 2, wherein said controlling the rotational speed of said motor to be stabilized at the target rotational speed of the motor and controlling the rotational speed of said engine to be stabilized at the target rotational speed of the engine after said clutch is disengaged comprises: Continuously sending a target rotating speed of the motor and a motor rotating speed control instruction to a motor controller through a hybrid transmission controller, wherein the motor controller adjusts the torque of the motor according to the difference value between the actual rotating speed and the target rotating speed after receiving the target rotating speed of the motor and the motor rotating speed control instruction, and when the target rotating speed of the motor is consistent with the actual rotating speed, the motor torque is kept unchanged; The hybrid transmission controller continuously sends the target rotating speed of the engine and an engine rotating speed control command to the engine controller, so that the rotating speed of the engine is controlled, and the engine is stabilized at the target rotating speed of the engine.
4. The method for self-learning clutch torque of a P2 hybrid commercial vehicle according to claim 1, wherein the motor target rotation speed is set to an idle rotation speed of an engine, and the engine target rotation speed is set to a maximum torque rotation speed point.
5. The method for self-learning the clutch torque of the P2 hybrid commercial vehicle according to claim 1, wherein the acquiring the motor angular acceleration, the motor torque, the motor moment of inertia and the clutch displacement in real time, and acquiring the torque transmitted by the clutch according to the motor angular acceleration, the motor torque and the motor moment of inertia comprises: motor rotation speed fed back by motor controller MCU is received in real time through hybrid transmission controller TCU And motor torque The clutch displacement detected by a displacement sensor on a clutch actuating mechanism is received in real time through a hybrid transmission controller TCU; Calculating motor angular acceleration based on the motor rotational speed; And acquiring torque transmitted by the clutch according to the motor angular acceleration, the motor rotational inertia and the motor torque.
6. The method for self-learning the clutch torque of the P2 hybrid commercial vehicle according to claim 5, wherein the motor angular acceleration is obtained by the following formula: Wherein, the Is the angular acceleration of the motor; the motor rotation speed is changed; Is the time difference; The torque transmitted by the clutch is obtained by the following formula: Wherein, the Torque transferred for the clutch; Torque for the motor at this moment; Is the rotational inertia of the motor.
7. The method for self-learning the clutch torque of the P2 hybrid commercial vehicle according to claim 1, wherein the set torque threshold is 80% of the maximum torque of the motor.
8. The method of claim 1, further comprising controlling the clutch to return to a closed state after the motor torque reaches a set torque threshold, and controlling the engine to stall.
9. The method for self-learning clutch torque of a P2 hybrid commercial vehicle of claim 2, further comprising the step of the hybrid transmission controller TCU canceling rotational speed control of the engine controller ECU and the motor controller MCU after the motor torque reaches a set torque threshold, wherein the hybrid transmission controller TCU overrides the vehicle controller HCU.
10. A system for self-learning clutch torque of a P2 hybrid commercial vehicle, comprising: The motor starting control module is used for responding to a clutch torque self-learning function activation instruction triggered when the vehicle is in a parking static state and the gear is in N gear, sending a motor starting instruction, and after the motor is started, driving the engine to start through the clutch by the motor; The clutch release control module is used for sending a clutch release instruction after the engine is started; the rotating speed control module is used for controlling the rotating speed of the motor to be stabilized at the target rotating speed of the motor after the clutch is separated, and controlling the rotating speed of the engine to be stabilized at the target rotating speed of the engine; The data acquisition module is used for controlling the clutch to be closed, controlling the rotating speed of the engine to be maintained at the target rotating speed of the engine in the closing process of the clutch, acquiring the angular acceleration of the motor, the torque of the motor, the rotational inertia of the motor and the displacement of the clutch in real time, and acquiring the torque transmitted by the clutch according to the angular acceleration of the motor, the torque of the motor and the rotational inertia of the motor; And the torque transmission line acquisition module is used for forming a clutch torque transmission curve according to the clutch displacement and the torque transmitted by the clutch after the motor torque reaches a set torque threshold.

Description

Method and system for self-learning of clutch torque of P2 hybrid commercial vehicle Technical Field The invention belongs to the technical field of automobiles, and relates to a method and a system for self-learning of clutch torque of a P2 hybrid commercial vehicle. Background In the automotive industry, clutches are used as key components for power transmission, the performance of which directly affects the shift quality and driving feel of the vehicle. Because of factors such as manufacturing precision difference, assembly deviation possibly occurring in the installation process, unavoidable abrasion of various parts after long-term use of vehicles and the like in the production link, the torque transmission characteristics of the clutch on each vehicle are unique and are not completely consistent. If the clutch torque curve cannot be accurately corrected, unsmooth power engagement before and after gear shifting can be caused, and driving experience is seriously affected. In the starting process of the traditional AMT commercial vehicle, the torque characteristic curve can be corrected and estimated through clutch slipping, and the corresponding relation between the clutch transmission torque and the clutch position is determined. However, when the P2 hybrid commercial vehicle starts, the pure electric mode is adopted in most cases, and at the moment, the clutch is always kept in a disconnected state, and no sliding operation can be performed. This results in a P2 hybrid commercial vehicle that cannot correct the torque transmission curve of the clutch by clutch slipping as in a conventional AMT commercial vehicle. Therefore, it is necessary to study a method for clutch torque self-learning of a P2 hybrid commercial vehicle. Disclosure of Invention The invention aims to provide a method and a system for self-learning of clutch torque of a P2 hybrid commercial vehicle, which are used for solving the technical problem that the torque transmission characteristic of the clutch cannot be modified by the P2 hybrid commercial vehicle. In order to achieve the above purpose, the invention is realized by adopting the following technical scheme: in a first aspect, the invention provides a method for self-learning of clutch torque of a P2 hybrid commercial vehicle, comprising the following steps: responding to a clutch torque self-learning function activation instruction triggered when the vehicle is in a parking static state and the gear is in N gear, sending a motor starting instruction, and after the motor is started, driving an engine to be started by the motor through a clutch; after the engine is started, a clutch release instruction is sent; after the clutch is separated, controlling the rotating speed of the motor to be stabilized at the target rotating speed of the motor, and controlling the rotating speed of the engine to be stabilized at the target rotating speed of the engine; Controlling the clutch to be closed, controlling the rotating speed of the engine to be maintained at the target rotating speed of the engine in the clutch closing process, acquiring the angular acceleration of the motor, the torque of the motor, the moment of inertia of the motor and the displacement of the clutch in real time, and acquiring the torque transmitted by the clutch according to the angular acceleration of the motor, the torque of the motor and the moment of inertia of the motor; And after the motor torque reaches a set torque threshold, a clutch torque transmission curve is formed according to the clutch displacement and the torque transmitted by the clutch. In a second aspect, the present invention provides a system for self-learning clutch torque of a P2 hybrid commercial vehicle, comprising: The motor starting control module is used for responding to a clutch torque self-learning function activation instruction triggered when the vehicle is in a parking static state and the gear is in N gear, sending a motor starting instruction, and after the motor is started, driving the engine to start through the clutch by the motor; The clutch release control module is used for sending a clutch release instruction after the engine is started; the rotating speed control module is used for controlling the rotating speed of the motor to be stabilized at the target rotating speed of the motor after the clutch is separated, and controlling the rotating speed of the engine to be stabilized at the target rotating speed of the engine; The data acquisition module is used for controlling the clutch to be closed, controlling the rotating speed of the engine to be maintained at the target rotating speed of the engine in the closing process of the clutch, acquiring the angular acceleration of the motor, the torque of the motor, the rotational inertia of the motor and the displacement of the clutch in real time, and acquiring the torque transmitted by the clutch according to the angular acceleration of the motor, the torque of the motor an