Electric vehicle and its motor control system and control method

Abstract

The invention discloses a motor control system of an electric vehicle, which comprises: an IGBT module is connected with the motor of the electric vehicle; a detection module is used to detect the rotation speed of the motor; a drive module drives the on and off of the IGBT to control the motor; The modules are connected; the first control module is respectively connected with the channel selection module and the detection module, the second control module is connected with the channel selection module, and the second control module communicates with the first control module; the first control module outputs the first control signal to control the IGBT module; when the first control module fails, the second control module outputs a second control signal according to the motor speed at the preset time before the first control module fails. The motor control system converts uncontrollable failures caused by vehicle failures into controllable failures, ensures that the vehicle stops smoothly, safely and reliably, and avoids violent vibrations in the front and rear of the vehicle. The invention also discloses a control method of an electric vehicle and its motor control system.

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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