Motor thermodynamic model-based over-temperature protection method for electric power-assisted steering system

Abstract

The invention provides a motor thermodynamic model-based over-temperature protection method for an electric power-assisted steering system. The method comprises the following steps of: establishing a motor thermodynamic model which represents a relationship between heat which is generated and dissipated during operation of a motor and the temperature of the motor; sampling the current of the motor and the temperature of a control module; calculating the current estimation temperature of the motor by using the current of the motor, the temperature of the control module and the motor thermodynamic model; comparing the calculated estimation temperature of the motor with the range of a normal operation temperature threshold value of the motor; and limiting the current of the motor if the estimation temperature of the motor is not in the range of the temperature threshold value. The method has the advantages of low implementation cost, simple technology and high accuracy.

Description

technical field [0001] The invention relates to a diagnosis method of a motor, in particular to an over-temperature protection method for an electric power steering system based on a thermodynamic model of a motor. Background technique [0002] Compared with the traditional hydraulic power steering system, the electric power steering system has many advantages such as simple structure, good power assist performance, and energy saving. One of the core components of the electric power steering system is the motor, and the normal operation of this component is closely related to the safety performance of the steering system. Therefore, the focus and difficulty of electric power steering system development is the diagnosis method of the motor, among which the motor over-temperature protection is one of the most important diagnosis methods. [0003] The motor over-temperature protection method used in the traditional electric power steering system usually uses two methods to obt...

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Problems solved by technology

[0006] The purpose of the present invention is to provide an over-temperature protection method based on a motor thermodynamic model for an electric power steering system, so as to solve the problem of high cost, difficulty in implementation, or insufficient temperature measurement in the existing motor over-temperature protection method for an electric power steering system. exact question

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