Method for redundant communication between MCU chips of EPS system

Abstract

The invention discloses a method for redundant communication between MCU chips of an EPS system, particularly relates to the technical field of automobile EPS systems, and comprises a main control unit A, a main control unit B, a CAN communication circuit and an SPI communication circuit. According to the invention, data communication between the MCUs is carried out through the CAN and the SPI, and common cause failure of communication between double MCU chips is eliminated. The CAN communication mode between the double MCUs is innovated on the basis of a traditional single-system circuit, RH, RL and RHL resistors are added, and the cost is hardly increased. Meanwhile, the CAN and SPI data protocols are consistent, the communication format and content are unified, the portability of software is high, and the labor cost is reduced. According to the invention, the problem of degradation and even failure of the unmanned driving function caused by disconnection of control data interaction due to inter-chip communication failure of the EPS system can be solved; and the common cause failure problem of the double-path SPI or the double-path CAN can be effectively avoided. Therefore, the EPS system has good safety performance and life support, and has good operation stability and reliability.

Description

technical field [0001] The present invention relates to the technical field of automotive EPS systems, and more specifically, the present invention relates to a method for redundant communication between MCU slices of the EPS system. Background technique [0002] At present, due to the high safety requirements of electric power steering (EPS) in unmanned driving, more and more redundant MCU control schemes and technologies are emerging. The redundancy of the corner sensor, the current sensor, and the main control unit MCU realizes the redundant function of the EPS. Through the communication between the two main control units, the control information is exchanged, and the switch from the main control system to the redundant system is realized, and the main control system The functions of the system are cut off, so as to realize the intelligent driving function with high safety level. Therefore, reliable communication between the dual redundant systems is particularly importan...

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the above-mentioned defects of the prior art, the present invention provides a method for redundant communication between MCU slices of the EPS system. The technical problem to be solved by the present invention is: to solve the communication failure between the MCU slices of the current EPS system, which leads to control data The disconnection of the interaction of the unmanned driving function caused the problem of degradation or even failure; and some redundant methods cannot deal with the simultaneous failure of dual-channel SPI or dual-channel CAN.

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