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Method for acquiring DC contactor equivalent service life of electric vehicle and device thereof

A technology of DC contactors and electric vehicles, applied in the direction of circuit breaker testing, etc., can solve problems such as the method of contactor life that has not been found, and achieve the effect of reducing and avoiding safety accidents

Inactive Publication Date: 2013-11-27
SINOEV TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, no method has been found to evaluate the life of contactors

Method used

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  • Method for acquiring DC contactor equivalent service life of electric vehicle and device thereof
  • Method for acquiring DC contactor equivalent service life of electric vehicle and device thereof
  • Method for acquiring DC contactor equivalent service life of electric vehicle and device thereof

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Embodiment Construction

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0022] In current electric vehicles, the use of DC contactors or relays is basically passive control, or just a simple monitoring method of pull-in and disconnection. When the service life of DC contactors or relays is close to the limit, if they are not replaced in time, There are bound to be great potential safety hazards in the driving process and even directly bring about safety accidents. Therefore, in order to solve this problem, the present invention pr...

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Abstract

The invention discloses a method for acquiring a DC contactor equivalent service life, and the method is invented for the effective early warning of the service life of a DC contactor or a relay. The method comprises the following steps of dividing the load current of a DC contactor into a plurality of current intervals according to the number frequency characteristic of an estimating connection / disconnection power switch; obtaining the sacrificed life value of the DC contactor corresponding to each of the current intervals according to the number frequency characteristic of the estimating connection / disconnection power switch, and obtaining the life decay factor corresponding to each of the current intervals; obtaining a current value when the DC contactor carries out action, and determining the current interval to which the current value belongs and the life decay factor corresponding to the current interval to which the current value belongs; and obtaining the actual equivalent service life value of the DC contactor by using life decay factor corresponding to the current interval to which the current value belongs. The method is suitable for the equipment and device with a large current DC contactor.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a method and a device for obtaining the equivalent service life of a DC contactor of an electric vehicle. Background technique [0002] With the enhancement of public awareness of environmental protection, electric vehicles that do not emit harmful gases that pollute the atmosphere have become a hot spot in the world's technological and economic competition. At present, the power source of electric vehicles is mainly a large-capacity energy storage system composed of batteries and fuel cells. Among them, the energy storage system often needs to switch control through DC contactors or relays to supply power to the electrical equipment in the vehicle. The durability and reliability of DC contactors or relays directly affect the safety and service life of vehicles. [0003] The DC contactor is an executive switch for the electric vehicle to supply the DC power supply, wh...

Claims

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Application Information

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IPC IPC(8): G01R31/327
Inventor 漆利国
Owner SINOEV TECH
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