Method for detecting high-voltage power-on of electric vehicles

Abstract

The embodiment of the invention provides a method for performing high-voltage electrifying detection on an electric vehicle. The method comprises the following steps: when a voltage acquiring device in a high-voltage electrifying detection circuit of the electric vehicle has hardware voltage acquisition faults, obtaining a voltage estimation value of the voltage acquiring device according to the state and the residual capacity of the power battery of the electric vehicle; according to the voltage estimation value of the voltage acquiring device, performing high-voltage electrifying detection in stages through the high-voltage electrifying detection circuit. According to the embodiment of the invention, a fault-tolerant protection strategy of the high-voltage electrifying detection of the electric vehicle is set, multiple detection in electrifying and un-electrifying processes through a software strategy, electrifying abnormity detection caused by a hardware acquiring loop is compensated, the fault-tolerant capacity in electrifying and un-electrifying processes of the system is increased to a certain extent, so that the high-voltage electrifying detection efficiency of the electric vehicle is effectively improved, and the electrifying process of the whole system is relatively stable and reliable.

Description

technical field [0001] The invention relates to the technical field of automobile electrical detection, in particular to a method for detecting high-voltage power-on of electric vehicles. Background technique [0002] The power-on and power-on of pure electric vehicles involves low-voltage power-on and high-voltage power-on, especially the process of high-voltage power-on, which has a huge impact on vehicle safety, component reliability, and system stability. Therefore, a series of high-voltage relay function tests are required during the high-voltage power-on process of the electric vehicle, and these tests are judged based on the changes in the voltage collected at the front and rear ends of the high-voltage relay. [0003] In the prior art, a relay function detection method during the high-voltage power-on and power-off process of an electric vehicle is as follows: during the high-voltage power-on and power-off process of an electric vehicle, the function detection of the...

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Problems solved by technology

[0004] The disadvantage of the relay function detection method in the above-mentioned prior art during the high-voltage power-on and power-off process of the electric vehicle is: when the hardware voltage acquisition circuit fails, the function test of the high-voltage relay cannot be performed, so that the normal high-voltage power-on and power-off of the electric vehicle cannot be guaranteed. power, system reliability is reduced

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