BLDC (brushless direct current) motor fault diagnosis system

Abstract

The invention discloses a BLDC (brushless direct current) motor fault diagnosis system which comprises an MCU and a fault diagnosis protection module, wherein the MCU can be used for diagnosing a BLDC motor fault type by combining interrupt response and periodic duty with a BLDC motor fault flag bit state emitted by the fault diagnosis protection module, can be used for receiving a three-phase short-circuit state of the BLD motor, and can be used for realizing fault recovery on the BLDC motor trough a BLDC motor fault recovery flag bit and on-off of BLDC motor driving; the fault diagnosis protection module is used for performing current sampling on the BLDC motor, and can be used for triggering the fault flag bit according to current sampling of the BLDC motor and the three-phase short-circuit state of the BLDC motor; and a BLDC motor current limit value set by the fault diagnosis protection module is greater than an earthing short circuit protective threshold value. The BLDC motor fault diagnosis system can avoid failure in report of BLDC motor faults, and can realize BLDC motor fault recovery during driving cycle at that time.

Description

Technical field [0001] The invention relates to the field of automobiles, and in particular to a fault diagnosis system for a BLDC motor (brushless DC motor). Background technique [0002] The contemporary BLDC motor control system is mainly composed of BLDC motor, BLDC motor drive chip and controller. The condition of each component directly affects the effect and working performance of BLDC motor control. In order to improve the safety of BLDC motor control, each component of the BLDC motor control system Timely detection and fault diagnosis of status are extremely important. [0003] The following problems exist in the fault diagnosis technology of the existing BLDC motor control system: [0004] 1) The software diagnosis strategy is not perfect, and there is a risk of underreporting; [0005] 2) The current driving cycle cannot be repaired, which affects the BLDC motor control function; [0006] 3) The setting of current limit value and short circuit limit value is unreasonable. ...

AI Technical Summary

Problems solved by technology

[0004] 1) The software diagnosis strategy is not perfect enough, and there is a risk of underreporting;

[0005] 2) The current driving cycle cannot be repaired, which affects the control function of the BLDC motor;

[0006] 3) The setting of current limit value and short circuit limit value is unreasonable

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