Electric power-assisted steering system

An electric power steering and power-assisted motor technology, which is applied to electric steering mechanisms and other directions, can solve the problems of long feeding time, incompliance, safety hazards, etc., and achieve the effect of ensuring system safety, solving safety hazards, and improving cost performance.
CN102582677AActive Publication Date: 2012-07-18LIANCHUANG AUTOMOBILE ELECTRONICS
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
LIANCHUANG AUTOMOBILE ELECTRONICS
Publication Date
2012-07-18

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Abstract

The invention discloses an electric power-assisted steering system which comprises a relay, a main MCU (Microprogrammed Control Unit) and an auxiliary MCU, wherein a normally-open contact of the relay is connected in a power-assisted motor driving loop in series; the main MCU and the auxiliary MCU carry out data transmission in a serial communication mode; the relay is jointly controlled by the main MCU and the auxiliary MCU; in the electrified initial operation period, the switching logic of the relay is diagnosed, and whether the relay can be controlled by the two MCUs to actuate according to correct logic is judged; in the program polling operation period, the two MCUs mutually monitor the operating states, when any one of the two MCUs breaks down, the relay is switched off through the other normally-operating MCU, a power supply of the motor-assisted motor driving loop is cut off, and the electric power-assisted steering system is enabled to be switched to the mechanical steering mode. With the adoption of the electric power-assisted steering system, the potential safety hazards in a hardware watchdog or a software watchdog can be solved, and the system security is guaranteed.
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Description

technical field

[0001] The invention relates to the technical field of automotive electronics, in particular to an electric power steering system with dual MCU (micro control unit) redundant monitoring functions. Background technique

[0002] The electric power steering system is an automobile safety-related component, which has extremely high requirements on safety performance. It is required that when the electric power steering system breaks down or fails, the system / ECU (Electronic Control Unit) can cut off the power, so that the electric power steering system is in the mechanical steering mode to ensure driving safety. This puts forward safety requirements for each key sub-component of the electric power steering system, among which, the safety design of ECU software and hardware is particularly critical.

[0003] At present, the safety design of the electric power steering system is mainly reflected in setting a hardware watchdog or a software watchdog, but this metho...

Claims

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