System and method for managing timing sequences of high-low voltage power-on and power-off of plug-in hybrid electric vehicles

Abstract

The invention relates to a system and a method for managing timing sequences of high-low voltage power-on and power-off of plug-in hybrid electric vehicles. The system comprises a vehicle control unit VCU, a flat-motor controller ISU, a drive-motor controller TMU, a low-voltage power-on switch KL.15, a high-voltage power-on switch KL.50, a compressor controller ACP, a direct-current converter DCDC, an electric-oil-pump controller EOP, a positive main contactor PMC, a negative main contactor NMC, a pre-charge contactor PCC and a battery management unit BCU. High-low voltage power-on and power-off control strategies of a vehicle power system are completely realized by the VCU. The system and the method have the advantage that both personal safety and operation safety of electric loads can be guaranteed before or after high-voltage power-on and power-off of a vehicle, and power system failure caused by power-on and power-off timing sequence disorder is avoided.

Description

technical field [0001] The invention relates to the field of electronic control of hybrid electric vehicles, in particular to a method for managing high and low voltage power-on and power-on sequences of plug-in hybrid electric vehicles. Background technique [0002] Hybrid vehicles, especially pure electric commercial vehicles, will introduce many high-voltage loads. Some high-voltage loads have large energy storage filter capacitors at the DC input end. For self-protection, the load is separately connected to a contactor at its power supply input. If these loads are not pre-charged again when starting these loads separately, high-voltage startup failure or even load burnout will occur. In hybrid vehicles, the power system with the most high-voltage power supply and the traditional mechanical hydraulic control system need to coordinate and cooperate. The hydraulic system of the transmission system needs to be prepared in advance before the high-voltage load outputs torque, ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a plug-in hybrid electric vehicle high and low voltage power-on and power-on sequence management method to solve the problem that the high-voltage parts of the hybrid new energy vehicle and the traditional transmission system do not generate any faults during the high-voltage and low-voltage power-on and power-on processes of the whole vehicle. impact on personal safety and the safety of actuators and controllers