Controller circuit, sampling method and control method of electric power steering system, and thereof

Abstract

The invention discloses a controller circuit,a sampling method and a control method of an electric power steering system. The circuit comprises a three-phase motor, a microcontroller, a three-phase bridge module and a three-phase motor phase voltage state feedback circuit. The three-phase motor phase voltage state feedback circuit comprises three voltage division circuits and three pull-up circuits. The microcontroller is used for controlling the U-phase upper bridge field-effect tube, the U-phase lower bridge field-effect tube, the V-phase upper bridge field-effect tube, the V-phase lower bridge field-effect tube, the W-phase upper bridge field-effect tube and / or the W-phase lower bridge field-effect tube to be opened or closed, and carrying out power-on fault diagnosis on the U-phase upper bridge field-effect transistor, the U-phase lower bridge field-effect transistor, the V-phase upper bridge field-effect transistor, the V-phase lower bridge field-effect transistor, the W-phase upper bridge field-effect transistor and the W-phase lower bridge field-effect transistor based on the voltage acquired by the analog-to-digital conversion voltage acquisition end. According to the invention, accurate diagnosis of each field effect transistor in the three-phase bridge module is realized, and the diagnosis coverage rate of the field effect transistor is improved.

Description

technical field [0001] The invention relates to the technical field of control of an electric power steering system, in particular to a controller circuit and a sampling and control method of the electric power steering system. Background technique [0002] The electric power steering system has the advantages of small size, light weight, simple structure, high efficiency, energy saving and environmental protection, flexible control methods, etc., and has become an indispensable part of the car. Electric power steering system controller circuit design and its control method are the core of the electric power steering system. Suppliers of electric power steering systems or controllers at home and abroad have their own controller circuit design and control methods. The main core functions are Functional safety design of power-assisted motor control and steering system. [0003] Since the electric power steering system controller has relatively high safety performance requirem...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defect that the diagnosis of the field effect tube of the three-phase bridge module in the electric power steering system controller circuit in the prior art is not accurate enough, and to provide an easy and convenient way to perform three-phase bridge Controller circuit and sampling and control method of electric power steering system for electrical fault diagnosis

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