Integrated regenerative braking control strategy for the accelerator pedal of mine trackless electric vehicle for auxiliary transportation

During the long-distance downhill operation of coal mine trackless auxiliary transportation vehicles in inclined shaft, a considerable amount of braking energy is available for recovery. Due to the parallel structure of the foot valve intrinsic safety potentiometer composite brake pedal, traditional explosion-proof electric vehicles often use mechanical regenerative parallel braking control strategies, which have limited the recovery of braking energy. To this end, a regenerative braking control strategy integrated into the accelerator pedal was proposed for the mine trackless electric vehicles of auxiliary transportation, in order to further improve the energy recovery rate of regenerative braking and effectively increase the endurance of mine trackless electric vehicles for auxiliary transportation. A theoretical model of the regenerative braking process was established based on vehicle braking dynamics and energy conservation laws. Based on the driving system of auxiliary electric vehicles and the structural characteristics of the accelerator pedal, an integrated regenerative braking control strategy model for the accelerator pedal was established, and the working principles of the control strategy during vehicle acceleration, coasting, and braking processes were analyzed in sequence. Based on the load characteristics of human vehicle transfer operations in a domestic inclined coal mine auxiliary transportation roadway, a cyclic testing condition including vehicle speed and slope was developed. Using them as input conditions, two control strategies, integrated regenerative braking of the accelerator pedal and hydraulic regenerative parallel braking of the brake pedal, were simulated and compared on the Matlab/Simulink numerical calculation platform. The simulation results of the integrated regenerative braking control strategy for the accelerator pedal were experimentally verified on a dual drum chassis dynamometer. The results show that the total power consumption of the integrated regenerative braking control model of the accelerator pedal is reduced by 21.06% compared to the original system, the equivalent driving range is extended by 23 km, and the error between simulation and bench test results does not exceed 5%, indicating a better energy efficiency.