CN-119123025-B - Vehicle control method, controller and vehicle

Abstract

The invention relates to a control method of a vehicle, a controller and the vehicle, wherein the control method comprises the following steps: when a locking instruction is received, the wheel end decoupler of the differential mechanism of the vehicle is controlled to execute coupling operation, and then the differential lock of the differential mechanism is controlled to execute locking operation. According to the control method of the vehicle of the invention, the wheel-end decoupler is already coupled in advance when the differential lock is locked. The problem of locking failure caused by locking operation under the uncoupled state of the wheel end in the related art is avoided, and the normal realization of the differential locking function is ensured.

Inventors

• YANG DONGSHENG
• ZHU HAIBO
• WANG KUNCHENG
• TANG LIZHONG
• ZHU FUTANG

Assignees

• 比亚迪股份有限公司

Dates

Publication Date

20260505

Application Date

20230612

Claims (14)

1. 1. A control method of a vehicle having a differential including a differential body, a differential lock, and a wheel end decoupler, comprising: when a locking instruction is received, the wheel end decoupler of the differential mechanism of the vehicle is controlled to execute coupling operation, and then the differential lock of the differential mechanism is controlled to execute locking operation.
2. 2. The control method according to claim 1, characterized in that the step of controlling the differential lock of the differential to perform a locking operation after controlling the wheel end decoupler of the differential of the vehicle to perform a coupling operation includes: controlling the differential lock to perform a locking operation when the vehicle satisfies a lock enabling condition, wherein the lock enabling condition includes that a vehicle speed of the vehicle is less than a first target vehicle speed; When the vehicle meets a forced coupling condition, controlling the wheel end decoupler to execute coupling operation, wherein the forced coupling condition comprises that the speed of the vehicle is smaller than a second target speed; Wherein the first target vehicle speed is less than the second target vehicle speed.
3. 3. The control method according to claim 2, characterized in that the range of the first target vehicle speed is (0, 5) km/h.
4. 4. The control method according to claim 2, wherein the second target vehicle speed is in a range of [5,10 ] km/h.
5. 5. The control method according to claim 2, characterized by further comprising: and allowing the differential lock to perform an unlocking operation when the vehicle meets an unlocking enabling condition, wherein the unlocking enabling condition comprises that the speed of the vehicle is greater than a third target speed, and the third target speed is greater than the second target speed.
6. 6. The control method according to claim 5, characterized in that the range of the third target vehicle speed is (30, 50) km/h.
7. 7. The control method according to any one of claims 1 to 6, characterized in that the vehicle is a four-wheel drive vehicle, and the differential is a differential of an auxiliary drive of the four-wheel drive vehicle.
8. 8. The control method according to claim 7, characterized by further comprising: Allowing the differential lock to perform a locking operation when the vehicle satisfies a lock enabling condition, wherein the lock enabling condition includes that a vehicle speed of the vehicle is less than a first target vehicle speed, a rotational speed difference of connecting shafts at both ends of the wheel end decoupler is less than a first target rotational speed difference, and an output torque of the vehicle is less than a first target torque; And when the vehicle meets a coupling enabling condition, allowing the wheel end decoupler to execute coupling operation, wherein the coupling enabling condition comprises that the rotating speed difference of the connecting shafts at two ends of the wheel end decoupler is smaller than a second target rotating speed difference, and the output torque of the auxiliary drive is smaller than a first target torque, and the second target rotating speed difference is smaller than the first target rotating speed difference.
9. 9. The control method according to claim 8, characterized in that the range of the first target rotational speed difference is (30, 100) rpm.
10. 10. The control method according to claim 8, wherein the range of the second target rotation speed difference is (0, 30) rpm.
11. 11. The control method according to claim 8, characterized by further comprising: And when the auxiliary drive meets a forced coupling condition, controlling a wheel end decoupler of the auxiliary drive to execute coupling operation, wherein the forced coupling condition comprises that the speed of the four-wheel drive vehicle is larger than a fourth target speed, and the fourth target speed is larger than the third target speed.
12. 12. The control method according to claim 11, characterized in that the fourth target vehicle speed range is (120, maximum allowed vehicle speed) km/h.
13. 13. A controller operating in accordance with the control method of any one of claims 1 to 12.
14. 14. A vehicle comprising the controller of claim 13.

Description

Vehicle control method, controller and vehicle Technical Field The invention belongs to the technical field of vehicle power systems, and relates to a vehicle control method, a controller and a vehicle. Background In the related art, a differential mechanism with an electronic differential lock can realize the functions of differential rotation of wheel ends and rotation of the wheel ends at the same speed by controlling the locking mechanism to be disconnected and connected so as to meet the requirements of different running working conditions of a vehicle. Therefore, avoiding the failure of the differential lock is a technical problem to be solved currently. Disclosure of Invention The invention provides a control method of a vehicle, a controller and the vehicle, and aims to solve the problem that in the prior art, locking failure occurs when locking operation is performed in a state that wheel ends are not coupled. In order to solve the above technical problems, in one aspect, an embodiment of the present invention provides a method for controlling a vehicle, including: when a locking instruction is received, the wheel end decoupler of the differential mechanism of the vehicle is controlled to execute coupling operation, and then the differential lock of the differential mechanism is controlled to execute locking operation. Optionally, the step of controlling the wheel end decoupler of the differential of the vehicle to perform a coupling operation and then controlling the differential lock of the differential to perform a locking operation includes: controlling the differential lock to perform a locking operation when the vehicle satisfies a lock enabling condition, wherein the lock enabling condition includes that a vehicle speed of the vehicle is less than a first target vehicle speed; When the vehicle meets a forced coupling condition, controlling the wheel end decoupler to execute coupling operation, wherein the forced coupling condition comprises that the speed of the vehicle is smaller than a second target speed; Wherein the first target vehicle speed is less than the second target vehicle speed. Optionally, the range of the first target vehicle speed is (0, 5) km/h. Optionally, the range of the second target vehicle speed is [5,10 ] km/h. Optionally, the differential lock is allowed to perform an unlocking operation when the vehicle satisfies an unlocking enabling condition, wherein the unlocking enabling condition includes a vehicle speed of the vehicle being greater than a third target vehicle speed, the third target vehicle speed being > the second target vehicle speed. Optionally, the third target vehicle speed is in the range of (30, 50) km/h. Optionally, the vehicle is a four-wheel drive vehicle, and the differential is a differential of an auxiliary drive of the four-wheel drive vehicle. Optionally, the method further comprises: Allowing the differential lock to perform a locking operation when the vehicle satisfies a lock enabling condition, wherein the lock enabling condition includes that a vehicle speed of the vehicle is less than a first target vehicle speed, a rotational speed difference of connecting shafts at both ends of the wheel end decoupler is less than a first target rotational speed difference, and an output torque of the vehicle is less than a first target torque; And when the vehicle meets a coupling enabling condition, allowing the wheel end decoupler to execute coupling operation, wherein the coupling enabling condition comprises that the rotating speed difference of the connecting shafts at two ends of the wheel end decoupler is smaller than a second target rotating speed difference, and the output torque of the auxiliary drive is smaller than a first target torque, and the second target rotating speed difference is smaller than the first target rotating speed difference. Optionally, the first target speed difference is in the range of (30,100) rpm. Optionally, the second target rotational speed difference is in the range of (0, 30) rpm. Optionally, when the auxiliary drive meets a forced coupling condition, controlling the wheel end decoupler of the auxiliary drive to execute coupling operation, wherein the forced coupling condition comprises that the speed of the four-wheel drive vehicle is greater than a fourth target speed, and the fourth target speed is greater than the third target speed. Optionally, the fourth target vehicle speed range (120, allowing the highest vehicle speed) km/h. According to the vehicle control method, when the locking instruction is received, the wheel end decoupler of the differential mechanism of the vehicle is controlled to perform coupling operation, and then the differential lock of the differential mechanism is controlled to perform locking operation. In this way, the wheel-end decoupler is already coupled in advance when the differential lock is locked. The problem of locking failure caused by locking operation under the uncoupled s