Relay state detection method and device of electric vehicle high-voltage system

A state detection device and high-voltage system technology, applied in the field of electric vehicles, can solve the problems of personal safety hazards, the inability to clearly determine whether the relay is in a working state or a fault state, and the inability to effectively monitor the state of the relay to achieve the effect of ensuring safety

Active Publication Date: 2011-09-07
奇瑞新能源汽车股份有限公司
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Problems solved by technology

[0004] At present, the method of detecting the relay is mainly to collect the current in the relay coil as the re-inspection signal of the relay, but this method can only detect whether the BMS has controlled the relay, but cannot effectively monitor the status of the relay, that is, it cannot be clearly judged Whether the relay is in a working state or a fault state, and faults such as relay sticking cannot be detected
For example, when the relay

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  • Relay state detection method and device of electric vehicle high-voltage system
  • Relay state detection method and device of electric vehicle high-voltage system
  • Relay state detection method and device of electric vehicle high-voltage system

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Embodiment Construction

[0021] Hereinafter, the present invention will be described with reference to the drawings and examples.

[0022] First, a brief description of the existing electric vehicle high voltage system is given.

[0023] figure 1 It is the structural diagram of the existing electric vehicle high voltage system. Such as figure 1 As shown, the existing high-voltage system of an electric vehicle includes three relays, namely, a negative relay 1 , a pre-charging relay 2 and a positive relay 3 . In addition, the high-voltage system also includes a power battery pack 4, a motor 5, a current sensor 6, and a pre-charging resistor 7, etc. In order to realize the safe connection of the high-voltage system, there is a sequence requirement for the closing of the relay. If the DC high-voltage system is directly connected, the defect is that before the high-voltage system is connected, it is impossible to sense whether the output circuit has faults such as excessive load or short circuit. There...

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Abstract

The invention provides a relay state detection method of an electric vehicle high-voltage system. The method comprises the step of determining whether a relay is in a normal work state or in a fault state based on the voltages at both ends of the relay and/or the coil current of the relay according to the switch-on and switch-off time sequences of the relay in the electric vehicle high-voltage system. Correspondingly, a relay state detection device is provided. The method and the device can be used for monitoring the relay state to clearly determine whether the relay is in the work state or in the fault state, thereby well controlling the output of high-voltage power and ensuring the personal safety as well as the safety of electric vehicles.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a method and device for detecting the state of a relay in a high-voltage system of an electric vehicle. Background technique [0002] Vehicles utilizing gasoline internal combustion engines or diesel internal combustion engines have caused severe air pollution. Accordingly, various recent efforts to develop electric vehicles or hybrid vehicles have focused on reducing air pollution. [0003] In current hybrid vehicles and pure electric vehicles, the high-voltage power source is usually composed of several battery packs in series, and the output voltage is as high as hundreds of volts, which is far beyond the safe voltage that the human body can bear. The output and cut-off of the high-voltage power of the battery pack is usually realized by the battery management system (BMS) controlling the closing and opening of the relay. The relay is equivalent to a safety switch ...

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Application Information

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IPC IPC(8): G01R31/327G01R19/165
Inventor 何志华徐贤
Owner 奇瑞新能源汽车股份有限公司
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