Motor active short circuit control device and method and automobile

Abstract

The embodiment of the invention discloses a motor active short circuit control device and method and an automobile. The device comprises a voltage monitoring module, an inverter control module and a driving module, wherein the inverter control module is connected with the voltage monitoring module and the driving module, the voltage monitoring module is connected with a bus capacitor in parallel,collects a real-time voltage VC at two ends of the bus capacitor in real time, and sends the real-time voltage VC to the inverter control module, the inverter control module is used for sending a first control signal to the driving module when the real-time voltage VC is greater than a first threshold voltage VC1, and the driving module is used for driving the inverter to alternately enter an offstate and an active short-circuit state according to the first control signal till the real-time voltage VC is reduced to a first threshold constant voltage VC1. The device is advantaged in that the current can be controlled to alternately flow through an upper bridge and a lower bridge of an inverter in the process of braking the motor due to abnormality of the motor driving system, so loss of the inverter in the process is prevented from being concentrated on the upper bridge or the lower bridge.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of automobiles, in particular to a motor active short-circuit control device and method, and an automobile. Background technique [0002] The performance of the motor drive system is directly related to the running performance of the car. Usually, the motor drive system includes power supply, bus capacitor, resistor, inverter, three-phase motor and control board. The bus capacitor and three-phase motor are connected in parallel at both ends of the power supply. , the inverter is respectively connected to the power supply, the three-phase motor and the control board, wherein the inverter controls the rotation of the motor according to the control signal sent by the control board. When the motor drive system fails, the three-phase motor needs to stop rotating to stop the car and ensure the safety of passengers. [0003] In the prior art, when the motor drive system fails, the three-p...

AI Technical Summary

Problems solved by technology

However, in the active short-circuit state, the upper bridge (or lower bridge) of the inverter is always in the conduction state, resulting in a large loss of the upper bridge (or lower bridge) of the inverter, and the overall loss of the inverter is uneven.

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