Discharge management method and system for a plug-in hybrid electric vehicle

Abstract

The invention provides a discharge management method and system of a plug-in hybrid electric vehicle, belonging to the technical field of plug-in hybrid electric vehicles. It solves the problem in the prior art that the vehicle itself is difficult to run normally due to the external discharge of the hybrid electric vehicle. A discharge management method for a plug-in hybrid electric vehicle, comprising the following steps: A. Applying high voltage to the whole vehicle; B. Selecting whether the power battery supplies power; C. Limiting power. A discharge management system for a plug-in hybrid electric vehicle, including a vehicle controller, a relay unit, a battery controller connected to the relay unit, an air conditioner controller capable of limiting the power consumption of an air conditioning system, and a battery controller capable of limiting the discharge power of a two-way charger The charging and discharging controller, the charging and discharging controller, the battery controller and the air conditioner controller are respectively connected to the vehicle controller, and the vehicle controller is also connected to a detection unit. The invention can avoid the situation that the vehicle itself is difficult to run normally when the vehicle discharges to the outside.

Description

technical field [0001] The invention belongs to the technical field of plug-in hybrid electric vehicles, and relates to a discharge management method and system for plug-in hybrid electric vehicles. Background technique [0002] Automobile technology is developing with the development of society. Plug-in hybrid electric vehicle is a new type of hybrid electric vehicle, which can be charged externally, and combines traditional power system with pure electric power system to make up for their respective disadvantages. [0003] The plug-in hybrid electric vehicle includes the engine, motor, power battery, battery, vehicle controller, battery management system that obtains the state of the power battery and protects the power battery from over-discharge, and converts high-voltage DC to low-voltage DC for use in the car. DCDC converter (DCDC is direct current to direct current) for power supply of electric equipment, air conditioning system and charger (On-board Charger abbreviat...

AI Technical Summary

Problems solved by technology

[0005] Although the discharge method and system of the hybrid electric vehicle can realize the continuous external discharge of the hybrid electric vehicle to a certain extent, it does not take into account the power consumption of the electric equipment inside the vehicle and the power consumption of the air conditioning system. When the battery supplies power alone, and the peak discharge power of the power battery is less than the sum of the power consumption of the DCDC converter, the power consumption of the air conditioning system and the power consumption of external equipment during the discharge process, the continuous peak discharge power discharge of the power battery cannot meet the current power consumption. For the power consumption of the equipment, although the power of the power battery is still large, the peak discharge power of the power battery is too low to trigger the power battery protection of the battery management system, so that the power battery stops supplying power, resulting in the failure of the vehicle power battery and the two-way on-board charger. In addition, even if the power battery protection of the battery management system is not triggered, the low voltage output by the DCDC converter will be insufficient to maintain the power consumption of the internal electrical equipment of the vehicle, which will cause the battery to affect the internal use of the vehicle. If the battery power is low, it will be used up soon, which will damage the battery, and make the electrical equipment in the car go into sleep mode. The vehicle function cannot be used normally. It is difficult to start the vehicle again after the battery is dead.

Therefore prior art is unreasonable and safe to the management of hybrid electric vehicle discharge

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