Contactor control system and control method for electric vehicle high voltage compartment

Abstract

The invention relates to a control system and a control method for a contactor in a high-voltage compartment of an electric vehicle. The system includes: a control power supply connected to a DC bus, a DC bus contactor connected to the control power supply through the DC bus, and the The power-on buffer contactor connected in parallel with the DC bus contactor, and a controller for controlling the pull-in of the DC bus contactor and the power-on buffer contactor, the bus capacitance is connected in parallel on the DC bus, and the control The system also includes a voltage detection unit connected to the controller: the controller is used to close the DC bus contactor according to the voltage difference between the two ends of the DC bus contactor. The invention effectively avoids the contact adhesion caused by the suction of the DC bus contactor under abnormal conditions by identifying whether the two ends of the DC bus contactor are powered on abnormally, and improves the safety performance.

Description

technical field [0001] The invention relates to the field of new energy vehicles (pure electric or hybrid vehicles), and more specifically relates to a control system and a control method for a high-voltage cabin contactor of an electric vehicle that prevents contact adhesion of the high-voltage cabin contactor. Background technique [0002] At present, the internal electrical topology of the powertrain integrated power control unit (PCU) of the motor controller in most electric vehicles in China is as follows: figure 1 As shown, it includes five components including internally integrated high-voltage chamber 10 , TM motor driver 20 , ISG motor driver 30 , EPS motor driver 40 and 24V DC / DC power supply 50 . Among them, the contactors KM1 / KM2 in the high-voltage chamber 10 perform the on-off control of the bus circuit of the TM driver 20 and the ISG driver 30, and the contactors KM3 / KM4 perform the on-off control of the bus circuit between the EPS motor driver 40 and the DC / D...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a method that can effectively prevent the DC bus contactor from being under reverse pressure due to the low reliability of the contactor control method in the existing motor controller and the relatively high risk of contactor adhesion failure. Contactor control system and control method for electric vehicle high-voltage compartment contactor caused by contact adhesion under poor conditions

Images