Abstract:

A braking control strategy was proposed for a wheel drive hydraulic hybrid vehicle(WDHHV) based on the backward modeling method. The strategy considered the changes of the vertical loads, the braking safety, the braking energy regeneration efficiency, and the state of charge of the energy accumulator, to solve such key problems that influence the energysaving effects and the braking safety of the WDHHV as how to effectively utilize the energy saved by the regenerative braking, to reasonably distribute the regenerative braking force on each wheel, and to harmonize the relationship between the regenerative and the frictional braking. The relatiors among the vehicle speed, the pressure change in energy accumulator, and the regenerated energy were obtained through modeling and simulation in the environment of Matlab/Simulink. The results showed that the proposed strategy can effectively enhance the energy regeneration efficiency with the precondition of braking safety.

Key words: vehicle engineering, fluid transmission and control, regeneration braking control strategy, braking force distribution, wheel drive