High-voltage interlocking detection system and method and electric vehicle

Abstract

The invention discloses a high-voltage interlocking detection system and method and an electric vehicle. The system is applied to the electric vehicle and comprises high-voltage components, a high-voltage connector, high-voltage interlocking detection modules and a vehicle control unit, wherein the high-voltage interlocking detection modules are in one-to-one correspondence with the high-voltage components; the high-voltage component comprises a high-voltage interlocking detection input port and a high-voltage interlocking detection output port; the high-voltage connector is used for electrically connecting the two high-voltage components; the high-voltage interlocking detection module comprises a low-voltage signal source and a detection unit, the low-voltage signal source is electricallyconnected with the high-voltage interlocking detection input port, the input end of the detection unit is electrically connected with the high-voltage interlocking detection output port, and the output end of the detection unit is electrically connected with the vehicle control unit; the detection unit is used for detecting whether the connection of the corresponding high-voltage component is normal or not and generating a corresponding detection result; the vehicle control unit is used for judging whether the electric vehicle is powered off or not according to the detection result. Accordingto the system, fault points of high-voltage interlocking can be rapidly checked, and the maintenance rate is improved.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of electric vehicles, in particular to a high-voltage interlock detection system and method, and an electric vehicle. Background technique [0002] With the continuous popularization of electric vehicles, high-voltage safety is becoming more and more popular in the society. The state promulgated GB / T18384.3 "Safety Requirements for Electric Vehicles Part 3: Protection against Electric Shock for Personnel", and the voltage of electric vehicles above Class B The electric shock protection of the circuit includes: (1) the basic protection method to prevent direct contact with the live parts (2) the protection method in the case of a single point failure, and the electric vehicle must be equipped with a high voltage interlock (High Voltage Interlock Loop, HVIL) Features. [0003] The realization of high-voltage interlock now integrates the high-voltage interlock detection circuit throug...

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Problems solved by technology

[0003] The realization of high-voltage interlock now integrates the high-voltage interlock detection circuit through the battery management system (BMS), and uses the low-voltage circuit to connect the high-voltage components of the vehicle in series to realize the high-voltage interlock function. When the vehicle reports a high-voltage interlock fault, it cannot Quickly check the fault point of the high-voltage interlock, resulting in low maintenance efficiency and difficult maintenance of electric vehicles, and because the high-voltage interlock circuit is relatively long, the probability of false alarms and error reports increases

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