Method for estimating service life of DC (direct current) contactor of electric vehicle

A technology of DC contactors and electric vehicles, which is applied in the direction of circuit breaker testing, etc., and can solve the problems of inability to predict the end of life of DC contactors, failure to remind users of DC contactors, and inability of the vehicle system to understand the working status of DC contactors, etc. problems, to achieve the effect of easy maintenance and maintenance, and technology promotion

Inactive Publication Date: 2012-09-05
HUIZHOU EPOWER ELECTRONICS
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Problems solved by technology

This will cause the whole vehicle system to be unable to understand the working status of the DC contactor, to

Method used

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Embodiment Construction

[0013] In order to facilitate the understanding of those skilled in the art, the present invention will be described in further detail below in conjunction with the embodiments:

[0014] The DC contactor for electric vehicles will encounter many complex situations in the actual use process, and it is impossible to ensure that the DC contactor can be closed and disconnected under the conditions of low working voltage and zero working current. When the DC contactor is closed, if there is a high voltage difference across the DC contactor, a certain load current will be generated at the moment when the DC contactor is closed. The smaller the load impedance is, the larger the current will be generated at the moment when the DC contactor is closed, which may exceed the rated capacity of the DC contactor and cause permanent damage to the contact directly. When the DC contactor is disconnected, if the current flowing on the DC contactor is not zero before the disconnection, the contac...

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Abstract

The invention relates to a method for estimating the service life of a DC (direct current) contactor of an electric vehicle. In the method, the rated action times of the DC contactor in different load voltage and load current conditions are converted into the action times in the rated load voltage and zero-load current condition respectively according to the action times feature curves of the DC contactor in different load voltage and load current conditions provided by the DC contactor specification; and starting from when the DC contactor comes into use, the converted action times are accumulated, and the service life of the DC contactor can be estimated by comparing the accumulated action times with the rated times in the rated load voltage and zero-load current condition. The method can perform monitoring and real-time analysis on the working state of the DC contactor in real time to finish estimation of the service life of the DC contactor, and provides the health status information of the contactor for the whole vehicle so as to remind the user to take proper maintenance and treatment measures for the contactor by the whole vehicle.

Description

Technical field [0001] The invention relates to a life prediction method of a DC contactor for electric vehicles. Background technique [0002] As an important electronic component of the DC high-voltage system of electric vehicles, DC contactors play a vital role in protecting the electrical safety of the entire vehicle. However, in actual use, if there are errors or other problems in the control strategy, the life of the DC contactor often cannot reach the design life of the entire vehicle. When designing an electric vehicle, the high-voltage DC contactor control on the DC bus is integrated into the battery pack and controlled by the battery management system. In terms of control, the current battery management system only judges and controls the control commands of the vehicle controller, but does not monitor the life status of the DC contactor. This will result in the vehicle system being unable to understand the working status of the DC contactor, unable to predict th...

Claims

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Application Information

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IPC IPC(8): G01R31/327
Inventor 刘飞阮旭松文锋盛大双
Owner HUIZHOU EPOWER ELECTRONICS
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