A high-voltage interlock detection system, method, and electric vehicle

Abstract

The invention discloses a high-voltage interlock detection system, method and electric vehicle. The system is applied to electric vehicles, including: high-voltage components, high-voltage connectors, high-voltage interlock detection modules and vehicle control units; high-voltage interlock detection modules correspond to high-voltage components; high-voltage components include high-voltage interlock detection input ports and high-voltage The interlock detection output port; the high-voltage connector is used to electrically connect two high-voltage components; the high-voltage interlock detection module includes a low-voltage signal source and a detection unit, the low-voltage signal source is electrically connected to the high-voltage interlock detection input port, and the input terminal of the detection unit is connected to the high-voltage interlock detection input port. The high-voltage interlock detection output port is electrically connected, and the output end of the detection unit is electrically connected to the vehicle control unit; the detection unit is used to detect whether the connection of the corresponding high-voltage components is normal and generates a corresponding detection result; the vehicle control unit is used for According to the detection result, it is judged whether the electric vehicle is powered off. The system can quickly check the fault point of the high-voltage interlock and improve the maintenance rate.

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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