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Relay adhesion detection method

A detection method and relay technology, applied in the field of electronic technology and new energy vehicles, can solve problems such as safety accidents, unreasonable vehicle control timing, relay adhesion, etc., and achieve the effect of preventing potential safety hazards

Inactive Publication Date: 2018-01-09
厦门金龙汽车新能源科技有限公司
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Problems solved by technology

[0002] In the new energy automobile industry, the safe and effective management of the high-voltage relay working status by the high-voltage power distribution cabinet involves the safety of the high-voltage power-on and power-off of the whole vehicle; Unreasonable, a large current will be generated on the power line, which will cause the relay to stick. Necessary safety hazard, the state of the relay must be detected

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Embodiment Construction

[0028] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0029] figure 1 It is a schematic diagram of the high-voltage circuit of the motor controller in the embodiment of the present invention, such as figure 1 As shown, the circuit includes a power supply, a main control relay K2 connected to the positive pole of the power supply, a load, a resistor R1 connected in parallel with the main control relay, and a pre-charging relay K1. The load is composed of a capacitor C and a resistor R2 parallel circuit;

[0030] figure 2 is the graph of the slope of point b when the relays K1 and K2 are individually closed in the embodiment of the present invention, when figure 1 When the pre-charging relay K1 in the circuit is closed and the main control relay K2 is disconnected, the capacitor ...

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Abstract

The invention relates to a relay adhesion detection method. The method includes: detection before switch-on of a relay: continuously sampling voltage values Vb1 of a b point within a limited time, determining that the states of a pre-charging relay K1 and a master control relay K2 are normal if the voltage values Vb1 before and after the b point are unchanged, otherwise calculating a change slopeK3 of the b point, and determining whether the pre-charging relay K1 has an adhesion fault or the master control relay K2 has the adhesion fault according to the change slope K3; and detection after switch-off of the relay: firstly reading a voltage value Vb2 of the b point, continuously sampling voltage values Vb3 of the b point within a limited time, calculating a change slope K4, analyzing thechange slope K4 of the sampling voltage of the b point, and determining whether the relay has the adhesion fault, wherein the b point indicates a connection terminal for switching on the pre-chargingrelay K1 or the master control relay K2 and a load. According to the method, the adhesion state of the relay is determined through monitoring of the change slope of the voltage across the relay.

Description

technical field [0001] The invention relates to the fields of electronic technology and new energy vehicles, in particular to a method for detecting relay adhesion. Background technique [0002] In the new energy automobile industry, the safe and effective management of the high-voltage relay working status by the high-voltage power distribution cabinet involves the safety of the high-voltage power-on and power-off of the whole vehicle; Unreasonable, a large current will be generated on the power line, which will cause the relay to stick. Necessary safety hazard, the state of the relay must be detected. Contents of the invention [0003] The invention provides a relay adhesion detection method, which aims to monitor the slope of the voltage change at both ends of the relay, accurately determine the adhesion state of the relay, and prevent potential safety hazards caused by abnormal electrification of the entire vehicle. [0004] To achieve the above object, the present i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/327
Inventor 林汉坤叶伟宏陈新现官发霖林宜备黄长顽
Owner 厦门金龙汽车新能源科技有限公司
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