Method and apparatus for lateral control of vehicle, storage medium and vehicle

Patent metadata

Field	Value
Publication number	US-12227241-B2
Application number	US-202217890764-A
Country	US
Kind code	B2
Filing date	Aug 18, 2022
Priority date	May 6, 2022
Publication date	Feb 18, 2025
Grant date	Feb 18, 2025

Abstract

A method for lateral control of a vehicle includes: determining a target steering wheel rotation angle based on a target trajectory of the vehicle and a vehicle pose; determining a steering wheel rotation angle compensation according to the target steering wheel rotation angle and steering data of the vehicle; and controlling steering of the vehicle according to the target steering wheel rotation angle and the steering wheel rotation angle compensation, such that an actual steering angle of the vehicle is consistent with the target steering wheel rotation angle.

First claim

What is claimed is:

1. A method for lateral control of a vehicle, comprising:
determining a target steering wheel rotation angle based on a target trajectory of the vehicle and a vehicle pose;
determining a steering wheel rotation angle compensation according to the target steering wheel rotation angle and steering data of the vehicle, wherein the steering data comprises an actual yaw velocity of the vehicle, and determining the steering wheel rotation angle compensation further comprises
determining a target yaw velocity corresponding to the target steering wheel rotation angle, and
determining the steering wheel rotation angle compensation according to the target yaw velocity and the actual yaw velocity based on a preset proportional derivative control strategy, which comprises
determining a yaw velocity adjustment amount according to the target yaw velocity and the actual yaw velocity, and
determining the steering wheel rotation angle compensation corresponding to the yaw velocity adjustment amount based on the preset proportional derivative control strategy; and

controlling steering of the vehicle according to the target steering wheel rotation angle and the steering wheel rotation angle compensation, such that an actual steering angle of the vehicle is consistent with the target steering wheel rotation angle.

2. The method according to claim 1 , wherein determining the target steering wheel rotation angle based on the target trajectory of the vehicle and the vehicle pose comprises:
determining the target steering wheel rotation angle according to the target trajectory and the vehicle pose through a path tracking control algorithm based on a kinematic model; and
determining the target yaw velocity corresponding to the target steering wheel rotation angle comprises:
determining the target yaw velocity according to the target steering wheel rotation angle, and a current vehicle speed, a vehicle wheelbase and a steering transmission ratio in the steering data.

3. The method according to claim 1 , wherein determining the target steering wheel rotation angle based on the target trajectory of the vehicle and the vehicle pose comprises:
determining the target steering wheel rotation angle according to the target trajectory and the vehicle pose through a path tracking control algorithm based on a dynamic model; and
determining the target yaw velocity corresponding to the target steering wheel rotation angle comprises:
determining the target yaw velocity according to the target steering wheel rotation angle, and a current vehicle speed, a vehicle wheelbase, a steering transmission ratio and a dynamic factor in the steering data.

4. The method according to claim 3 , wherein the dynamic factor is determined according to at least one of vehicle mass, cornering stiffness of a vehicle rear axle, a distance from a center of mass of the vehicle to a vehicle front axle, cornering stiffness of the vehicle front axle, a distance from the center of mass of the vehicle to the vehicle rear axle, the current vehicle speed, and the vehicle wheelbase.

5. The method according to claim 1 , wherein determining the yaw velocity adjustment amount according to the target yaw velocity and the actual yaw velocity comprises:
obtaining a yaw velocity error by calculating a difference between the target yaw velocity and the actual yaw velocity;
determining a minimum value between the yaw velocity error and a preset yaw velocity error upper limit to be a candidate yaw velocity adjustment amount; and
determining a maximum value between the candidate yaw velocity adjustment amount and a preset yaw velocity error lower limit to be the yaw velocity adjustment amount.

6. The method according to claim 1 , wherein determining the steering wheel rotation angle compensation corresponding to the yaw velocity adjustment amount based on the preset proportional derivative control strategy comprises:
determining a first candidate steering wheel rotation angle compensation according to a preset proportional control parameter, a preset derivative control parameter, the yaw velocity adjustment amount, a control cycle, and the yaw velocity adjustment amount calculated in a previous control cycle;
determining a minimum value between the first candidate steering wheel rotation angle compensation and a preset steering wheel rotation angle compensation upper limit to be a second candidate steering wheel rotation angle compensation; and
determining a maximum value between the second candidate steering wheel rotation angle compensation and a preset steering wheel rotation angle compensation lower limit to be the steering wheel rotation angle compensation.

7. The method according to claim 1 , wherein controlling steering of the vehicle according to the target steering wheel rotation angle and the steering wheel rotation angle compensation comprises:
controlling steering of the vehicle according to a sum value of the target steering wheel rotation angle and the steering wheel rotation angle compensation.

8. An apparatus for lateral control of a vehicle, comprising:
a processor; and
a memory for storing an instruction capable of being executed by the processor; wherein the processor is configured to:
determine a target steering wheel rotation angle based on a target trajectory of the vehicle and a vehicle pose;
determine a steering wheel rotation angle compensation according to the target steering wheel rotation angle and steering data of the vehicle, wherein the steering data comprises an actual yaw velocity of the vehicle, and determining the steering wheel rotation angle compensation further comprises
determining a target yaw velocity corresponding to the target steering wheel rotation angle, and
determining the steering wheel rotation angle compensation according to the target yaw velocity and the actual yaw velocity based on a preset proportional derivative control strategy, which comprises
determining a yaw velocity adjustment amount according to the target yaw velocity and the actual yaw velocity, and
determining the steering wheel rotation angle compensation corresponding to the yaw velocity adjustment amount based on the preset proportional derivative control strategy; and

control steering of the vehicle according to the target steering wheel rotation angle and the steering wheel rotation angle compensation, such that an actual steering angle of the vehicle is consistent with the target steering wheel rotation angle.

9. The apparatus according to claim 8 , wherein the processor is further configured to:
determine the target steering wheel rotation angle according to the target trajectory and the vehicle pose through a path tracking control algorithm based on a kinematic model; and
determine the target yaw velocity according to the target steering wheel rotation angle, and a current vehicle speed, a vehicle wheelbase and a steering transmission ratio in the steering data.

10. The apparatus according to claim 8 , wherein the processor is further configured to:
determine the target steering wheel rotation angle according to the target trajectory and the vehicle pose through a path tracking control algorithm based on a dynamic model; and
determine the target yaw velocity according to the target steering wheel rotation angle, and a current vehicle speed, a vehicle wheelbase, a steering transmission ratio and a dynamic factor in the steering data.

11. The apparatus according to claim 10 , wherein the dynamic factor is determined according to at least one of vehicle mass, cornering stiffness of a vehicle rear axle, a distance from a center of mass of the vehicle to a vehicle front axle, cornering stiffness o

Assignees

• Xiaomi Ev Tech Co Ltd

Inventors

• Zhang Chi
• Tan Wei
• Li Hao

Classifications

• B62D15/025 Primary

  Active steering aids, e.g. helping the driver by actively influencing the steering system after environment evaluation (B62D1/28 takes precedence) · CPC title

• B62D15/021

  Determination of steering angle · CPC title

• Y02T10/72

  Electric energy management in electromobility · CPC title

• G05D1/0212

  with means for defining a desired trajectory (involving a plurality of land vehicles G05D1/0287) · CPC title

• B62D15/024

  Other means for determination of steering angle without directly measuring it, e.g. deriving from wheel speeds on different sides of the car · CPC title