A contactor control method

Abstract

The invention belongs to the technical field of automobile control, and provides a contactor control method. Before contactors are powered by high-voltage electricity, the method includes the steps that the positive electrode contract is controlled to be turned on; the first end voltage between a whole vehicle high-voltage output positive electrode and a whole vehicle high-voltage output negative electrode is detected; whether the first end voltage is larger than zero or not is judged; the positive electrode contactor is controlled to be turned off and the negative electrode contactor is controlled to be turned on if the first end voltage is not larger than zero; the second end voltage between the whole vehicle high-voltage output positive electrode and the whole vehicle high-voltage output negative electrode is detected; whether the second end voltage is larger than zero or not is judged; and if the second end voltage is not larger than zero, the signal showing that adhesion happens to none of the negative electrode contactor, the positive electrode contactor and the precharging contractor is sent out. The invention aims at providing the contractor control method. By turning on and off the positive electrode contactor and the negative electrode contactor step by step, whether the end voltages between the whole vehicle high-voltage output positive electrode and the whole vehicle high-voltage output negative electrode are larger than zero or not are detected, and therefore whether adhesion happens to the contactors or not is judged, and reliability of a whole vehicle high-voltage system is improved.

Description

technical field [0001] The invention belongs to the technical field of automobile control, and in particular relates to a contactor control method. Background technique [0002] Power batteries are the core components of new energy vehicles, especially pure electric vehicles. The power battery contains high-voltage components such as high-voltage contactors, fuses, and pre-charging resistors, and these core components directly affect the normal operation of the vehicle. [0003] When the vehicle is powered on, the vehicle controller controls the pull-in of the relevant contactors to provide power to the high-voltage electrical components of the vehicle; however, the state of the contactors is not detected during the process of controlling the pull-in of the contactors, even if the contactors are stuck, also cannot be identified effectively. If the contactor is stuck and the high voltage is still directly powered on, the contactor of the power battery will be uncontrollable...

AI Technical Summary

Problems solved by technology

[0003] When the vehicle is powered on, the vehicle controller controls the pull-in of the relevant contactors to provide power to the high-voltage electrical components of the vehicle; however, the state of the contactors is not detected during the process of controlling the pull-in of the contactors, even if the contactors are stuck, also unable to effectively identify

If the contactor is stuck and the high voltage is still directly powered on, the contactor of the power battery will be uncontrollable, and the power supply control of the high voltage system of the vehicle will be abnormal, which will lead to the disorder of the circuit system of the vehicle and seriously affect the use of customers; and when the contactor When there is a sticking failure, the maintenance personnel are very likely to cause safety accidents to the maintenance personnel during the maintenance process of the vehicle.

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