Method and system for achieving steering-wheel turning angle verification based on EPS

Abstract

The invention relates to the technical field of automobile control, in particular to a method and system for achieving steering-wheel turning angle verification based on EPS. A target turning angle command is received, and according to the target turning angle command, a motor of a steering wheel is driven so as to make the steering wheel rotate to a target angle; the actual turning angle deltaalpha of the steering wheel in a sampling time interval deltat is calculated; the turning angle deltadelta of a motor in the sampling time interval deltat is calculated; the turning angle deltadelta of amotor in the sampling time interval deltat is converted into the relative turning angle deltabeta of the steering wheel; the difference between the relative turning angle deltabeta of the steering wheel and the actual turning angle deltaalpha of the steering wheel is calculated, when the absolute value of the difference is not greater than that of phi, it is judged that a turning angle signal ofthe steering wheel is normal, and when the absolute value of the difference is greater than phi, it is judged that the turning angle signal of the steering wheel is abnormal. According to the rotary position sensor signal of a motor of the steering wheel in an electric power steering system, the relative turning angle of the steering wheel is calculated out, and the redundancy check of a steeringwheel angle signal sent by a vehicle angle sensor is achieved.

Description

technical field [0001] The invention relates to the technical field of automobile control, in particular to a method and system for realizing steering wheel angle verification based on EPS. Background technique [0002] With the development of driving assistance and automatic driving technology, the electric power steering system, as the actuator of the lateral movement of the vehicle, needs to receive the feedback from the steering wheel angle sensor according to the target angle command of the host computer, and perform active steering actions based on closed-loop control. Therefore, during the control process of automatic steering, there is a higher functional safety level requirement for the steering wheel angle signal. [0003] At present, there are two schemes for steering wheel angle signals received by electric power steering. The first scheme is: use the angle sensor SAS that comes with the body stabilization system ESC to send the collected steering wheel angle sig...

AI Technical Summary

Problems solved by technology

[0004] For option 1, the normal version of the ESC comes with a lower functional safety level of the angle sensor function and does not have a self-diagnosis function. If this function is added, a steering wheel angle sensor with a higher safety level will be used to increase the cost of the vehicle body stabilization system.

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