The Combined Braking Energy Management Strategy to Maximize Energy Recovery 2016-01-0453
Eddy current retarder (ECR) shares a large market of auxiliary brakes in China, but shortcomings of the short continuous braking time and the high additional energy consumption are also obvious. The propose of combined braking partakes the braking torque of ECR. However, the existed serial-parallel braking strategy could hardly balance well the relationship between the braking stability and the energy recovery efficiency. This research puts forward an energy management strategy of combined braking system which aims to maximize energy recovery while ensure the brake stability. The motor speed, the braking request and the state of charge (SoC) of the storage module are analyzed synthetically to calculate the reasonable braking torque distribution proportion. And the recovered energy is priority for using in the braking unit to reduce the additional energy consumption in this strategy. First of all, the effect of the "electric-electric" combined braking mode on the braking performance is analyzed, and the mathematic model is set up. After that, three-input variables fuzzy controller is designed in MATLAB/Simulink to infer the braking torque distribution proportion, and its feasibility is proved through the simulation of combined braking conditions. Finally, the effect of this strategy on the combined braking efficiency and retarder’s braking stability are analyzed synthetically. The results demonstrate that: this strategy prolongs the stable working time of the combined braking system on the long downhill road, gives full play to the auxiliary braking effect of ECR and improves the braking energy reclaiming ratio to make up for the electric consumption of ECR on the precondition of the braking safety and stability.