Electric power-assisted steering system with software integrated monitoring function

Abstract

The invention discloses an electric power-assisted steering system with a software integrated monitoring function. An electronic control unit of the electric power-assisted steering system comprises double MCUs (microprogrammed control units), wherein control algorithm is set in the main MCU, the main MCU is used for calculating objective assistance moment according to signals of a sensor, a motor is controlled to output corresponding assistance, basic functions of the electronic control unit are completed, monitor algorithm is set in the auxiliary MCU, and the auxiliary MCU is used for monitoring operation conditions of the key algorithm of the main MCU in real time. The electric power-assisted steering system is safe and reliable, and has high cost performance. During working, the auxiliary MCU is used for monitoring the operation conditions of various key algorithm modules in the electronic control unit, and when the key algorithm or relevant hardware is failed, the auxiliary MCU informs the main MCU to cut off the assistance or close the failed algorithm modules. Accordingly, detection and fault protection to a software portion of the electronic control unit are realized, and safety and reliability of the electric power-assisted steering system are greatly improved.

Description

technical field [0001] The invention relates to an electric power steering system of an automobile, in particular to an electric power steering system with a software integrated monitoring function. Background technique [0002] Electric Power Steering (EPS for short) is a key safety component of a car, and its composition is as follows: figure 1 As shown, it includes two parts, an electric power assist device and a mechanical steering device. The electric power assist device further includes a torque / rotation angle sensor 1, a vehicle speed sensor 2, an electronic control unit (ECU) 3, a motor 4 and a deceleration structure 5; the mechanical steering device includes a steering wheel 6. Steering shaft 7, steering gear 8, steering tie rod 9 and steering wheel 10. Among them, the electronic control unit 3 is the calculation center of the whole system, which is used to determine the target current of the motor according to the signals provided by the torque / rotation sensor 1 a...

AI Technical Summary

Problems solved by technology

However, the detection and fault protection of the software or algorithm itself of the electronic control unit 3 have not yet been involved, which makes the design of the electronic control unit 3 in terms of safety not comprehensive enough.

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