Power-assisted steering system redundancy control system and method based on calibrated vehicle speed and vehicle

Abstract

The invention provides a power-assisted steering system redundancy control system and method based on a calibrated vehicle speed and a vehicle. The system comprises a steering column redundancy system, a steering gear redundancy system and an electronic control unit information channel, wherein the steering column redundancy system is used for making a first motor arranged on a steering column provide an assistance torque when the vehicle speed v is less than or equal to A or v is greater than A; the steering gear redundancy system is used for making a second motor arranged on a steering gearprovide an assistance torque when the vehicle speed v is less than or equal to A and the assistance torque provided by the first motor reaches a first set proportion S of a rated output torque K of the first motor; and the electronic control unit information channel is used for realizing communication between the steering column redundancy system and the steering gear redundancy system. The methodcomprises the following steps that in a normal working mode, when the vehicle speed v is less than or equal to A or v is greater than A, the first motor arranged on the steering column provides the assistance torque; and when the vehicle speed v is less than or equal to A and the assistance torque provided by the first motor reaches the first set proportion S of the rated output torque K of the first motor, a second motor arranged on the steering gear provides the assistance torque.

Description

Technical field [0001] The invention relates to the field of automobile steering systems, in particular to a power-assisted steering system redundant control system based on a calibrated vehicle speed and a power-assisted steering system redundant control method based on a calibrated vehicle speed. Background technique [0002] The future development of automobiles has the following four major trends: autonomous driving, non-contact control (voice control, etc.), shared cars and electric cars. Various countries and regions have high safety requirements for autonomous driving. If there is no redundant architecture, it will be very dangerous if key components such as EPS fail, for example, there is no power assist on the highway. Redundant architecture can greatly reduce the failure probability of the entire system. After the system has a non-assisted failure, it can ensure the normal operation of the system or maintain partial assistance, thereby meeting the safety requirements of...

AI Technical Summary

Problems solved by technology

This patent application discloses the first torque and rotation angle sensor, the first electronic control unit ECU and the first motor, the second torque and rotation angle sensor, the second electronic control unit ECU and the second motor arranged on the string belt, In this scheme, the first motor generates road feeling analog torque when turning, and provides the driver with a driving steering feel through the first reduction mechanism, and the second motor drives the mechanical structure to control the steering action, and the steering torque is mainly output by the second motor. Under the scheme, the motor power utilization rate is low

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