Troubleshooting method for electric power steering system with MCU computing unit

Abstract

The invention discloses a fault processing method for an electric power steering system with a MCU arithmetic unit. The method comprises the steps that a MCU initializes a task, wherein the the I / O port initial value of a control relay is set into that the relay is open; the fault flag of the MCU arithmetic unit is configured into that reset initialization is prohibited, and in the power-on reset process, the flag is reset; when it is monitored that the MCU arithmetic unit goes wrong, the flag is set as 1, and then the MCU executes a software Reset program; after software resets, when the MCU is initialized, it is judged whether there is arithmetic unit fault in the current powered ignition cycle or not according to the fault flag of the MCU arithmetic unit; if there is the fault, software Reset is conducted according to the second step; if there is not the fault, other power-on initialization tasks continues to be conducted. A novel fault processing method is provided, and it is ensured that when the arithmetic unit fault occurs, the MCU can correctly and effectively shut off a phase line breaker and a main breaker to enter a safe state.

Description

technical field [0001] The invention relates to an automobile electronic technology, in particular to a fault handling method in an electric power steering system of an automobile. Background technique [0002] In an EPS ECU (electric power steering system electronic control unit) system with only one single-core MCU, only this MCU can control the on-off of the phase circuit breaker or the main circuit breaker. [0003] When the system detects an EPS fault, it will set the corresponding fault flag. Once the system management module of the software detects a serious fault flag, it will issue an instruction to cut off the phase circuit breaker or the main circuit breaker, and the phase wire will be disconnected. switch or the control module of the main circuit breaker for cut-off operation. Such fault monitoring and system management mechanisms such as figure 1 shown. [0004] However, when the operation unit of the single-core MCU fails, although the software can detect th...

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Problems solved by technology

[0004] However, when the operation unit of the single-core MCU fails, although the software can detect the failure of the operation unit through certain detection means, the operation of the system management module itself needs to be based on the operation unit of the MCU. In the case of a fault, the ECU cannot ensure that the control modules of the phase line circuit breaker and the main circuit breaker can perform the cut-off operation correctly, so the power assist cannot be cut off, and the safe state cannot be entered

figure 2 The shading of the system management module and relay control module in the middle indicates that it is not working properly

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