Self-detection method for power module and current sensors of vehicle-used permanent-magnet synchronous motor system

Abstract

The invention discloses a self-detection method for a power module and current sensors of a vehicle-used permanent-magnet synchronous motor system. The method includes the following steps: motor current parameters are acquired by a control unit through the current sensors and the initial state of a system is judged preliminarily; then a high-voltage DC power supply is powered on and drive control signals are sent to each power switching tube in turn and the saturated switch-on voltage drops of the power switching tubes are detected through a drive circuit and the state of the power module is judged; under a normal state of the power module, a voltage ring of the control unit performs ring open to work and provides a determined motor rotor position angle and a d-axis voltage component; through a formula, a relation between motor three-phase currents and the applied motor d-axis voltage component is obtained and two different motor d-axis voltage component values are applied; and through intensity change of motor two-phase currents acquired by the control unit and a corresponding relation, whether the two current sensors are normal is judged. The method is convenient to realize detection of the power module and the current sensors and prevents that the system works under a fault state and ensures normal operation of the system.

Description

technical field [0001] The invention relates to a self-checking method of a power module and a current sensor of a permanent magnet synchronous motor system for a vehicle. Background technique [0002] The new energy vehicle industry is currently in a stage of rapid development, and the industry standards are gradually being revised and improved. The vehicle motor drive system is in the process of simultaneous research and development. In the process of vehicle loading verification, many functions still need to be improved to meet the application requirements of the vehicle motor system. At the same time, there are great technical difficulties in the fault diagnosis and positioning of the motor drive system, and there are still few applications. If the power module, current sensor and other key components inside the motor controller are abnormal and have not been detected, working in this case may cause the motor to fail to work normally, affect the operation of the vehicle,...

AI Technical Summary

Problems solved by technology

At the same time, there are great technical difficulties in the fault diagnosis and positioning of the motor drive system, and there are still few applications

If the power module, current sensor and other key components inside the motor controller are abnormal and have not been detected, working in this case may cause the motor to fail to work normally, affect the operation of the vehicle, and even cause damage to the controller in serious cases. Burned insurance or damage to other equipment of the vehicle, resulting in the expansion of the fault

Images