Abstract
A novel electric-hydraulic hybrid drivetrain incorporating a set of hydraulic systems is proposed for application in a pure electric vehicle. Models of the electric and hydraulic components are constructed. Two control strategies, which are based on two separate rules, are developed; the maximum energy recovery rate strategy adheres to the rule of the maximization of the braking energy recovery rate, while the minimum current impact strategy adheres to the rule of the minimization of the charge current to the battery. The simulation models were established to verify the effects of these two control strategies. An ABS (Anti-lock Braking System) fuzzy control strategy is also developed and simulated. The simulation results demonstrate that the developed control strategy can effectively absorb the braking energy, suppress the current impact, and assure braking safety.
Highlights
In the face of environmental crisis and pressure on energy sources, electric vehicles (EVs) have received significant attention
The results show the effectiveness of a designed control strategy
In this electric hydraulic hybrid system, there are three parts of the braking force in the front axle; the hydraulic regenerative braking force provided by the hydraulic pump/motor Fpreg, the electric regenerative braking force provided by the electric motor Fmreg, and friction Fffric
Summary
In the face of environmental crisis and pressure on energy sources, electric vehicles (EVs) have received significant attention. The hydraulic system is used to absorb the high-power braking energy and release the stored energy during start-up or acceleration This has the potential to increase energy efficiency and decrease over-current; the driving range of the vehicle and the cycle life of the battery are increased. Considering two aspects of the electric-hydraulic hybrid system, energy recovery rate and current impact, two types of braking force distribution control strategies were designed. In the control strategy based on maximum energy recovery rate, the hydraulic braking braking system was operated first. The electric system operated after the hydraulic system had absorbed absorbed adequate energy, and the speed of the vehicle had declined to a value suitable for the adequate energy, speedthe of the vehicle had declined to a value suitable the electric motor By and this the strategy, regenerative braking system can absorb an for optimum amount of.
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