Research on the braking energy reuse management strategy of hybrid electric mining trucks based on motor load rate

The braking energy recovery and reuse technology are significant to the energy-saving and emission reduction of hybrid mining dump trucks. Therefore, this paper proposes a technical scheme to increase the speed of the heavy-load uphill section by using the light overload of the motor. By constructing the vehicle dynamics model of the mining dump truck and the electric drive system component efficiency and engine energy consumption model and taking the “feedback braking energy-saving coefficient” as the evaluation index, the electric motors of each slope section under the rule-based energy management strategy are obtained. Then, the dynamic programing algorithm is used to optimize the selection of the motor load rate on the slope section. The results show that: on the premise of ensuring the dynamic performance of the vehicle, maximizing the use of the braking energy can shorten the driving time by 57.8 s and reduce the engine energy consumption 18.63 kWh, accounting for 8.56% of the engine energy consumption of the entire heavy-load uphill section. This paper provides a theoretical reference for the energy-saving research on the efficient reuse of braking energy of mining dump trucks on slopes.