Charging and discharging control method for battery of hybrid electric automobile

Abstract

The invention relates to a charging and discharging control method for a battery of a hybrid electric automobile. The control method includes the following main steps that a static state-of-charge model and a dynamitic state-of-charge model are established; a static charge threshold value is set according to the static state-of-charge model; the static state of charge and the dynamitic state of charge of the low-voltage battery are monitored in real time; a voltage set point of a current throttling device is set according to the static state of charge; the output voltage of the current throttling device is set according to the voltage set point; and charging and discharging of the low-voltage battery under the current condition are controlled according to the dynamitic state of charge. By the adoption of the method, the electric power supplied by a high-voltage power battery to the low-voltage battery can be in an excellent state and the energy use rate of the high-voltage power battery is increased.

Description

technical field [0001] The invention relates to the field of hybrid electric vehicles, in particular to a battery charging and discharging control method for hybrid electric vehicles. Background technique [0002] With the continuous deterioration of the global environment and the shortage of energy sources, reducing air pollution and dependence on petroleum energy has become an issue of increasing concern to all countries. In order to reduce environmental pollution and relieve energy pressure, research on energy-saving and environment-friendly automobiles has become an inevitable trend in the development of automobile industry in various countries. At present, the research and production of electric vehicles has become the first choice of the automobile industry in various countries. [0003] Typically, a hybrid electric vehicle includes two electrical energy storage packages: a high-voltage traction battery and a low-voltage battery. The high-voltage power battery usuall...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above technical problems, the present invention provides a battery charging and discharging control method for hybrid electric vehicles, by establishing a static state of charge model, a dynamic state of charge model, and setting a static charge threshold according to the static state of charge model , monitoring the static state of charge and the dynamic state of charge of the low-voltage battery in real time, setting the voltage set point of the current chopper according to the static state of charge, and setting the current chopper according to the voltage set point The output voltage of the rectifier and the charge and discharge of the low-voltage battery are controlled according to the dynamic state of charge. These six steps solve the problem of low operating efficiency of hybrid electric vehicles.

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