High-voltage safe protecting system for electric vehicle

Abstract

The invention discloses a high-voltage safe protecting system for an electric vehicle. An interlocking loop state of a high-voltage loop and the insulation resistance of a high-voltage system are detected through a battery managing system, and the system can change into a high-voltage power-off process to diagnose the interlocking signal states of the loop in the abnormal situation. The collision state signals can be detected and sent a whole-vehicle controller and the battery managing system through a safe air bag manager. In collision, the whole-vehicle controller and the battery managing system can change into a high-voltage power-off process and enable the whole-vehicle high voltage to be switched off. The high-voltage safe protecting system greatly improves high-voltage safety of the electric vehicle.

Description

technical field [0001] The invention relates to the field of electric vehicle safety, in particular to an electric vehicle high-voltage safety protection system. Background technique [0002] Traditional gasoline vehicles have the disadvantages of high energy consumption and high emissions. Pure electric vehicles only need to be driven by electric energy. Not only is the vehicle economical, but it also achieves zero emissions. However, since the use of energy storage systems and high-voltage components has high requirements on the safety and reliability of the system, how to make the high-voltage system of the whole vehicle operate effectively and safely, and enter a safe state when an abnormality occurs to ensure the safety of personnel and the whole vehicle Safety is an important part of the safety of pure electric vehicles. [0003] At present, the safety protection of the high-voltage system of pure electric vehicles adopts high-voltage loop interlocking, insulation mon...

AI Technical Summary

Problems solved by technology

[0004] Disadvantage 1: The high-voltage safety protection method is not perfect, and the high-voltage loop interlock detection cannot diagnose the validity of the signal

The interlock signal is to detect whether the high-voltage system plug-in is disconnected. Usually, a high level is applied to the interlock circuit. If no high level is detected, the interlock circuit is considered disconnected. This method cannot determine whether the interlock circuit is disconnected. In the event of a short circuit to the positive pole of the power supply, if the high-voltage plug-in is artificially disconnected when the circuit is short-circuited to the positive pole of the power supply, the system cannot recognize it, and there may be a risk of electric shock;

[0005] Disadvantage 2: The safety integrity of some collision protection functions is ignored, some collision safety states are not considered, and the diagnosis and redundancy design of some signals are not fully considered

The current high-voltage safety of collision mainly considers the collision protection of conventional vehicles such as front collision and side collision, but does not fully consider the high-voltage safety of rear collision and vehicle rollover

Moreover, the validity of the collision signal has not been fully diagnosed, and the high-voltage system may be disconnected in the case of a false collision signal, which will affect driving safety.

[0006] It can be seen that the existing electric vehicle high-voltage safety assurance scheme is not systematic and perfect, the high-voltage loop interlock detection cannot diagnose the validity of the signal, the safety integrity of some collision protection functions is ignored, the safety status of some collisions is not considered, and the diagnosis of some signals and redundant design considerations are insufficient

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