Judging method for failure of relay of electric vehicle high-voltage system
A technology for relay faults and high-voltage systems, applied in circuit breaker testing, instrumentation, measuring electricity, etc., can solve problems such as other relay judgments, and achieve the effect of program optimization
Active Publication Date: 2017-06-13
HUIZHOU BNET TECH CO LTD
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Problems solved by technology
Because of its technical solution, when it is judged that there is a fault problem in a certain relay, it will enter the fault processing state and cannot judge other relays, which means that it can only judge the fault problem of one relay at a time, making its technical solution have a certain limitations
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[0038] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.
[0039] It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for purposes of ill...
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The invention discloses a judging method for a failure of a relay of an electric vehicle high-voltage system. By presetting a setting state value Set of the relay, according to the differential voltage value between rear end voltage of the relay and voltage of a battery pack or the differential voltage value between voltage of the relay and the rear end voltage of the relay, and finally a state function of the relay is called. The corresponding set state value Set and the corresponding actual state value Act of the relay are compared and output, and according to a comparison result, whether the relay is in a normal state or a failed state is judged. In the technical scheme, the high-voltage power-on power-off program of an electric vehicle is optimized, all detection portions about the state of the relay can be directly obtained by calling monitoring results, and accuracy, rapidness, easiness and convenience are achieved. When the electric vehicle is in the standby state that the power-on and power-off progress is not executed, the relay can be monitored, safety is achieved, and better guarantees are provided.
Description
technical field [0001] The invention relates to the field of relay fault detection, in particular to a relay fault judgment method for a high-voltage system of an electric vehicle. Background technique [0002] Electric vehicles include hybrid electric vehicles, because there is a high-voltage drive system, that is, power batteries, high-voltage distribution boxes, etc. During the power-on and power-off process of the high-voltage system, especially frequent power-on and power-off, improper operation, wrong power-on and power-on sequence errors, etc., high voltage and high current are likely to cause ignition, relay burning and other faults when switching states. When the high-voltage contacts of the relay stick together due to ignition, the high-voltage system will not be disconnected. If it cannot be detected and dealt with in time, it is likely to threaten the safety of the power battery, the entire vehicle and even the operator. [0003] Relays are divided into relays ...
Claims
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Login to View More IPC IPC(8): G01R31/327
CPCG01R31/3275
Inventor 吴恒
Owner HUIZHOU BNET TECH CO LTD