Abstract
This paper proposes a double layered multi parameters braking energy recovery control strategy for Hybrid Electric Vehicle, which can combine the mechanical brake system with the motor brake system in the braking process to achieve higher energy utilization efficiency and at the same time ensure that the vehicle has sufficient braking performance and safety performance. The first layer of the control strategy proposed in this paper aims to improve the braking force distribution coefficient of the front axle. On the basis of following the principle of braking force distribution, the braking force of the front axle and the rear axle is reasonably distributed according to the braking strength. The second layer is to obtain the proportional coefficient of regenerative braking, considering the influence of vehicle speed, braking strength, and power battery state of charge (SOC) on the front axle mechanical braking force and motor braking force distribution, and a three-input single-output fuzzy controller is designed to realize the coordinated control of mechanical braking force and motor braking force of the front axle. Finally, the AMESim and Matlab/Simulink co-simulation model was built; the braking energy recovery control strategy proposed in this paper was simulated and analyzed based on standard cycle conditions (the NEDC and WLTC), and the simulation results were compared with regenerative braking control strategies A and B. The research results show that the braking energy recovery rate of the proposed control strategy is respectively 2.42%, 18.08% and 2.56%, 16.91% higher than that of the control strategies A and B, which significantly improves the energy recovery efficiency of the vehicle.
Highlights
Since hybrid electric vehicles (HEV) are equipped with a motor drive system that can select the appropriate driving mode according to the current driving conditions, but can recover energy during braking, improving energy utilization efficiency and reducing exhaust gas pollution, which has gradually become a major development trend in the automobile industry [1]
This paper proposes a double layers multi parameters braking energy recovery control strategy
Within the limits of braking regulations, a corresponding front and rear axle braking force distribution control strategy is formulated for each braking mode
Summary
Since hybrid electric vehicles (HEV) are equipped with a motor drive system that can select the appropriate driving mode according to the current driving conditions, but can recover energy during braking, improving energy utilization efficiency and reducing exhaust gas pollution, which has gradually become a major development trend in the automobile industry [1]. Among them, braking energy recovery technology is one of the core technologies of hybrid electric vehicles. In the process of vehicle braking energy recovery, considering the influence of factors such as braking safety, overcharging of energy storage devices and energy recovery efficiency, the braking force provided by the motor is limited and cannot meet the braking requirements of the vehicle. At this time, in order to ensure that the vehicle can brake smoothly, the mechanical braking force and the motor braking force need to work together [4,5]. The coordinated control between the mechanical braking force and the motor braking force occupies an important position in the development of braking energy recovery technology
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