EP-4741685-A1 - HYDRAULIC CONTROL METHOD AND APPARATUS, ELECTRONIC DEVICE, AND STORAGE MEDIUM

EP4741685A1EP 4741685 A1EP4741685 A1EP 4741685A1EP-4741685-A1

Abstract

The present application provides a hydraulic control method and apparatus, an electronic device, and a storage medium. The hydraulic control method includes: determining a first required oil pressure corresponding to an automatic transmission, and controlling a main oil pressure in a main oil circuit corresponding to the automatic transmission according to the first required oil pressure; determining a second required oil pressure corresponding to a first clutch without a pressure sensor; and determining a target opening degree of a solenoid valve corresponding to the first clutch according to the first required oil pressure and the second required oil pressure, and controlling an opening degree of the solenoid valve to be adjusted to the target opening degree. The solenoid valve is disposed between the main oil circuit and a pressure chamber corresponding to the first clutch.

Inventors

BAI, Jingfeng
JI, XIAOHUI
Shi, Yuanyuan
ZHANG, JINGJING
GUO, MINGLIANG
TANG, Guangqing

Assignees

Hycet Transmission System (Jiangsu) Co., Ltd.

Dates

Publication Date: 20260513
Application Date: 20251104

Claims (15)

A hydraulic control method, comprising: determining (S101) a first required oil pressure corresponding to an automatic transmission, and controlling a main oil pressure in a main oil circuit corresponding to the automatic transmission according to the first required oil pressure; determining (S102) a second required oil pressure corresponding to a first clutch without a pressure sensor; and determining (S103) a target opening degree of a solenoid valve corresponding to the first clutch according to the first required oil pressure and the second required oil pressure, and controlling an opening degree of the solenoid valve to be adjusted to the target opening degree, wherein the solenoid valve is disposed between the main oil circuit and a pressure chamber corresponding to the first clutch.
The hydraulic control method according to claim 1, wherein the determining the first required oil pressure corresponding to the automatic transmission comprises: acquiring a current input shaft rotating speed, a current input shaft torque, and a current gear position corresponding to the automatic transmission; determining a first main oil pressure according to the current input shaft rotating speed; determining a second main oil pressure according to the current input shaft torque and the current gear position; and determining a maximum value among the first main oil pressure, the second main oil pressure, and a preset limit main oil pressure as the first required oil pressure.
The hydraulic control method according to claim 2, wherein the determining the first main oil pressure according to the current input shaft rotating speed comprises: acquiring a first correspondence relationship between the input shaft rotating speed and the main oil pressure; and determining the first main oil pressure corresponding to the current input shaft rotating speed according to the first correspondence relationship.
The hydraulic control method according to claim 3, wherein the first correspondence relationship is: first main oil pressure = 0 , n < 2800 0.0167 ∗ n − 46.667 , 2800 ≤ n ≤ 4000 20 , n > 4000 wherein, n is the input shaft rotating speed.
The hydraulic control method according to any one of claims 2 to 4, wherein the determining the second main oil pressure according to the current input shaft torque and the current gear position comprises: acquiring a second correspondence relationship among an input shaft torque, a gear position, and the main oil pressure; and determining the second main oil pressure corresponding to the current input shaft torque and the current gear position according to the second correspondence relationship.
The hydraulic control method according to claim 5, wherein the second correspondence relationship is a main oil pressure map table constructed based on the current input shaft torque and the current gear position.
The hydraulic control method according to any one of claims 2 to 6, wherein, when a plurality of clutches corresponding to the automatic transmission comprises at least one second clutch provided with the pressure sensor, after the determining the maximum value among the first main oil pressure, the second main oil pressure, and the preset limit main oil pressure as the first required oil pressure, the method further comprises: acquiring an input end torque, a clutch torque ratio, a measured clutch gain, and a preset pressure compensation corresponding to the second clutch; determining a third main oil pressure corresponding to the second clutch according to the input end torque, the clutch torque ratio, the measured clutch gain, and the preset pressure compensation; comparing the third main oil pressure and the first required oil pressure; determining the third main oil pressure as the first required oil pressure when the third main oil pressure is greater than the first required oil pressure.
The hydraulic control method according to claim 7, wherein the method further comprises: maintaining the first required oil pressure unchanged when the third main oil pressure is less than or equal to the first required oil pressure.
The hydraulic control method according to claim 7 or claim 8, wherein the measured clutch gain is a ratio of a clutch torque to a clutch pressure.
The hydraulic control method according to any one of claims 1 to 9, wherein the determining the second required oil pressure corresponding to the first clutch comprises: acquiring an input end torque, a clutch torque ratio, a bench-measured clutch gain, and a preset torque compensation corresponding to the first clutch; determining a target required oil pressure according to the input end torque, the clutch torque ratio, the bench-measured clutch gain, and the preset torque compensation; and determining the target required oil pressure as the second required oil pressure.
The hydraulic control method according to claim 10, wherein, after the determining the target required oil pressure as the second required oil pressure, the method further comprises: comparing the target required oil pressure and a preset pressure; determining the target required oil pressure as the second required oil pressure when the target required oil pressure is greater than the preset pressure.
The hydraulic control method according to claim 11, wherein the method further comprises: determining the preset pressure as the second required oil pressure when the target required oil pressure is less than or equal to the preset pressure.
The hydraulic control method according to any one of claims 1 to 12, wherein when the first required oil pressure is less than the second required oil pressure, the target opening degree is a maximum opening degree of the solenoid valve.
An electronic device, comprising a processor, a memory and a computer program stored on the memory and executable on the processor, wherein the computer program, when executed by the processor, the hydraulic control method according to any one of claims 1 to 13 is implemented.
A computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, and the computer program, when executed by a processor, the hydraulic control method according to any one of claims 1 to 13 is implemented.

Description

TECHNICAL FIELD The present application relates to the field of automotive technologies, and in particular, to a hydraulic control method and apparatus, an electronic device, and a storage medium. BACKGROUND An automatic transmission equipped with multiple clutches is capable of shifting gear fast and accurately, which makes a vehicle have better power response during acceleration, overtaking, and other scenarios, thereby improving driving pleasure and safety. Currently, for the automatic transmission with all or some of the clutches being not provided with corresponding pressure sensors, pressure control on the clutch without the pressure sensor is mostly performed through full pressure control based on a main oil pressure in a main oil circuit corresponding to the automatic transmission. In other words, an opening degree of a solenoid valve corresponding to the clutch without the pressure sensor is always the largest, and the main oil pressure acts on the clutch directly. Since the main oil pressure is always higher than a clutch pressure, and when the main oil pressure is significantly higher than a required clutch pressure, it may cause the clutch to engage too tightly and abruptly, so that wear of a clutch plate is accelerated, thereby affecting performance of the clutch, and thus shortening a service life of the clutch. Moreover, it will also cause abnormal phenomena such as shuddering and slipping during the operation of the clutch, so that the power transmission and stability of the vehicle is affected, and thus affecting driving comfort. SUMMARY Embodiments of the present application provide a hydraulic control method and apparatus, an electronic device, and a storage medium to solve a problem in the conventional technology that a clutch without a pressure sensor is controlled through full pressure control based on a main oil pressure, which affects the performance of the clutch. In a first aspect, the embodiments of the present application provide a hydraulic control method, including: determining a first required oil pressure corresponding to an automatic transmission, and controlling a main oil pressure in a main oil circuit corresponding to the automatic transmission according to the first required oil pressure;determining a second required oil pressure corresponding to a first clutch without a pressure sensor; anddetermining a target opening degree of a solenoid valve corresponding to the first clutch according to the first required oil pressure and the, and controlling an opening degree of the solenoid valve to be adjusted to the target opening degree, where the solenoid valve is disposed between the main oil circuit and a pressure chamber corresponding to the first clutch. In some embodiments, the determining the first required oil pressure corresponding to the automatic transmission includes: acquiring a current input shaft rotating speed, a current input shaft torque, and a current gear position corresponding to the automatic transmission;determining a first main oil pressure according to the current input shaft rotating speed;determining a second main oil pressure according to the current input shaft torque and the current gear position; anddetermining a maximum value among the first main oil pressure, the second main oil pressure, and a preset limit main oil pressure as the first required oil pressure. In some embodiments, the determining the first main oil pressure according to the current input shaft rotating speed includes: acquiring a first correspondence relationship between the input shaft rotating speed and the main oil pressure; anddetermining the first main oil pressure corresponding to the current input shaft rotating speed according to the first correspondence relationship. In some embodiments, the determining the second main oil pressure according to the current input shaft torque and the current gear position includes: acquiring a second correspondence relationship among an input shaft torque, a gear position, and the main oil pressure; anddetermining the second main oil pressure corresponding to the current input shaft torque and the current gear position according to the second correspondence relationship. In some embodiments, the second correspondence relationship is a main oil pressure map table constructed based on the current input shaft torque and the current gear position. In some embodiments, when a plurality of clutches corresponding to the automatic transmission includes at least one second clutch provided with the pressure sensor, after the determining the maximum value among the first main oil pressure, the second main oil pressure, and the preset limit main oil pressure as the first required oil pressure, the method also includes: acquiring an input end torque, a clutch torque ratio, a measured clutch gain, and a preset pressure compensation corresponding to the second clutch;determining a third main oil pressure corresponding to the second clutch according to