Electric car and motor control system thereof and control method

Abstract

A motor control system of an electric vehicle, a controlling method for the motor control system and an electric vehicle are provided. The motor control system includes: an IGBT module, connected with a motor of the electric vehicle; a detection module, configured to detect a motor speed; a drive module, configured to drive IGBTs in the IGBT module to turn on or off so as to control the motor to work or stop working; a first control module; a second control module communicated with the first control module; and a channel selection module, configured to select a channel of the second control module when the first control module has a fault. When the second control module is selected, it sends a second control signal to the drive module according to the motor speed at a predetermined time before the first control module has the fault, so as to control the motor to stop working.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a motor control system and a control method thereof, and an electric vehicle. Background technique [0002] The drive motor controller of an electric vehicle is mainly composed of a power module, a minimum system, a resolver circuit, a drive module, a power module, an IPM (Intelligent Power Module, intelligent power module) protection circuit module, a sampling module, and an input and output switch. Among them, the power supply module provides the entire controller with the voltage required to make each module work normally, such as providing 3.3V or 1.9V or 5V for the minimum system to work normally, and +5V and ±15V to ensure the normal operation of the resolver circuit Equal voltage, 12V, 5V and other voltages that can make the drive circuit work normally, +15V1, -8V, +5V and other voltages that can make the drive module work normally, high voltage 460V that can mak...

AI Technical Summary

Problems solved by technology

At this time, the back electromotive force of the motor is higher than the voltage at both ends of the battery, so the energy of the high-speed operation of the motor (expressed as the back electromotive force of the motor) can be used to charge the car battery instantly through the uncontrollable rectification of the drive motor controller. Charging the battery and bus capacitor, the current is very large, will cause certain damage to the battery and bus capacitor of the car, and at the same time, the back electromotive force of the motor is too high, which may damage the drive device and power device of the drive motor controller, and has a large Feedback torque, the braking force is large and uncontrollable, causing the motor to vibrate violently, making the car in an uncontrollable state

[0004] The disadvantage of the existing technology is that when the drive motor controller of the electric vehicle is in the case of a DSP crash, the drive signal PWM wave of the drive motor controller to control the drive module is in an unknown state. If the vehicle is running at a high speed at this time, it may cause The vehicle shakes violently front and rear, loses control, and even causes damage to driving devices such as IGBTs or power devices

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