A power control device and control method for an electric vehicle with a hybrid energy storage system

Abstract

The invention relates to the field of electric vehicles, particularly to an electric quantity control device and method of a hybrid energy storage system electric vehicle. The control device comprises connecting a diode and a contactor between a lithium battery and a super capacitor, and the breakover direction of the diode is that electricity can only flow from the battery to the super capacity. The control device also comprises a sensing device for collecting various states of the electric vehicle and a control system which can control various parts of the electric vehicle according to information transmitted by the sensing device, wherein the sensing device collects various states of an engine in real time and transmits the states to the control system, and the control system compares and judges the states with preset values to control various parts to work and accordingly achieve electric quantity control. The electric quantity control device of the hybrid energy storage system electric vehicle can reasonably distribute the electric quantity of an energy storage system and an APU (auxiliary power unit) system to enhance the integral dynamic performance, improve the comprehensive fuel saving rate and reduce the energy consumption and discharging, and meanwhile, prolong the service life of the power battery and improve the electricity efficiency and the operating reliability of the power battery.

Description

technical field [0001] The invention relates to a power control device and a control method of an extended-range electric vehicle with a hybrid energy storage system. Background technique [0002] With the rapid increase of car ownership and the aggravation of environmental pollution, people's awareness of environmental protection and energy conservation has gradually increased, and the pursuit of clean energy has become increasingly urgent, which has made the development of pure electric vehicles receive great attention. However, due to the current bottlenecks in battery technology in terms of capacity and life, it is difficult to plan production of pure electric vehicles in a short period of time. In this case, the extended-range electric vehicle can not only effectively reduce fuel consumption, but also make up for the shortcomings of pure electric vehicles in terms of driving range and battery life. [0003] Energy storage systems are very important in the field of exte...

AI Technical Summary

Problems solved by technology

When the vehicle is running, when the lithium battery power is relatively sufficient, the power source of the drive motor comes entirely from the lithium battery, the APU system does not work, and the vehicle enters the pure electric vehicle mode. At this time, the lithium battery will be in a high-current charging and discharging state for a long time. Lithium batteries cause greater damage and affect the life of lithium batteries

When the lithium battery power is insufficient, the APU system starts. When the vehicle is running at low speed, the output power of the APU is greater than the power required by the drive motor. As a result, a considerable part of the power output by the APU system will be consumed during the charging and discharging process of the lithium battery, reducing the utilization rate of the power

When the vehicle is decelerating, the power battery recycles the output power of the APU and the regenerative power of the driving motor; when the vehicle is accelerating, the output power of the APU is less than the power required by the driving motor, and the APU and the power battery jointly provide power for the driving motor. During this process, the power battery is constantly During the charging and discharging process, its service life is greatly reduced

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