High-voltage and low-voltage power-on/off time sequence control method of pure electric vehicle

Abstract

The invention discloses a high-voltage and low-voltage power-on / off time sequence control method of a pure electric vehicle and belongs to the technical field of electronic control of new energy source vehicles. The high-voltage and low-voltage power-on / off time sequence control method comprises the following steps: activating KL15, enabling a VCU (Vehicle Control Unit) to be in a waiting mode from a sleeping mode and keeping for time T1; judging whether a KL15 activating state is changed or not; if the KL15 state is not changed, enabling the VCU to be in an operating mode, controlling a low-voltage controller to finish low-voltage power-on self inspection, and receiving an operating mode signal fed back by the low-voltage controller; enabling the VCU to receive the operating mode signal fed back by the low-voltage controller, and sending a high-voltage power-on request instruction to each high-voltage load controller, and sending a relay closing instruction to a BMS (Battery Management System); if the high-voltage power-on process is finished, disconnecting the KL15; enabling the VCU to be in the waiting mode from the operating mode and keeping for time T2; judging whether a KL15 disconnected state is changed or not; and if the KL15 state is not changed, enabling the VCU to control a whole vehicle power system to finish a high-voltage power-off process. By adding the waiting mode, a phenomenon that a user turns a key switch repeatedly so that a relay has a sticking fault is avoided, and thus the service life of the relay is prolonged.

Description

technical field [0001] The invention relates to the technical field of electronic control of new energy vehicles, in particular to a method for controlling high and low voltage power-on and power-on sequences of pure electric vehicles. Background technique [0002] With the development of the economy, environmental and energy problems are further intensified, and the disadvantages of using traditional vehicles are becoming more and more prominent. It can solve the environmental pollution caused by exhaust emissions of fuel vehicles and is gradually favored. [0003] New energy vehicles, especially pure electric vehicles, use power batteries as energy sources. Therefore, the control method of high and low voltage power on and off for pure electric vehicles is different from that of traditional vehicles. In the existing high and low voltage power on and off control methods of new energy vehicles, the vehicle controller (Vehicle Control Unit, VCU) controls the high voltage pow...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a high and low voltage power-on and power-on sequence control method for pure electric vehicles, so as to solve the problem of frequent adhesion failure and short service life of relays in the prior art

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