High-voltage power-on control method and high-voltage power-off control method for pure electric vehicle

Abstract

The invention belongs to the field of high-voltage power-on and power-off control methods for automobiles, and particularly relates to a high-voltage power-on control method and high-voltage power-offcontrol method for a pure electric vehicle. Pre-charging of a PTC, DCDC circuit and MCU circuit is performed separately in a high-voltage power-on process, the MCU circuit is controlled to achieve active discharging in a high-voltage power-off process, the MCU circuit, the PTC and the DCDC circuit are controlled separately in the high-voltage power-on process and the high-voltage power-off process. When only the PTC needs to work, the MCU does not need to be powered by high voltage, thereby reducing the closing frequency of an MCU circuit contactor, and the service life of the MCU circuit contactor is prolonged.

Description

technical field [0001] The invention belongs to a control method for high-voltage power-on and power-off of automobiles, in particular to a high-voltage power-on control method and a high-voltage power-off control method of pure electric vehicles. Background technique [0002] As environmental problems and energy problems intensify, the disadvantages of using traditional cars are becoming more and more prominent. At the same time, with the progress of society and the enhancement of environmental protection awareness, new energy vehicles can solve the exhaust emissions of fuel vehicles because they are powered by on-board power supplies. Pollution of the environment and gradually favored. [0003] New energy vehicles, especially pure electric vehicles, use power batteries as energy sources. The existing high and low voltage power on and off control methods for new energy vehicles usually use MCU (motor controller), PTC (electric heater), DCDC (direct current inverter) device...

AI Technical Summary

Problems solved by technology

[0004] There are problems when it is applied to the high and low voltage power-on and power-off control of new energy vehicles: First, during the high-voltage power-on and power-off process of the car, since the MCU, PTC, and DCDC are in the same high-voltage circuit, when only the PTC is required to work, it still needs to be closed Main positive contactor, reducing the service life of the contactor

Second, during the high-voltage power-on and power-off process of the car, the application of power source energy is unreasonable and the energy loss is large

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