Optimal control of a novel uninterrupted multi-speed transmission for hybrid electric mining trucks

Abstract

Considering the energy consumption and specific performance requirements of mining trucks, a novel uninterrupted multi-speed transmission is proposed in this paper, which is composed of a power-split device, and a three-speed lay-shaft transmission with a traction motor. The power-split device is adapted to enhance the efficiency of the engine by adjusting the gear ratio continuously. The three-speed lay-shaft transmission is designed based on the efficiency map of traction motor to guarantee the drivability. The combination of the power-split device and three-speed lay-shaft transmission can realize uninterrupted gear shifting with the proposed shift strategy, which benefits from the proposed adjunct function by adequately compensating the torque hole. The detailed dynamic models of the system are built to verify the effectiveness of the proposed shift strategy. To evaluate the maximum fuel efficiency that the proposed uninterrupted multi-speed transmission could achieve, dynamic programming is implemented as the baseline. Due to the “dimension curse” of dynamic programming, a real-time control strategy is designed, which can significantly improve the computing efficiency. The simulation results demonstrate that the proposed uninterrupted multi-speed transmission with dynamic programming and real-time control strategy can improve fuel efficiency by 11.63% and 8.51% compared with conventional automated manual transmission system, respectively.

Shift Strategy Optimization for Automatic Transmission of Heavy Trucks Based on Dynamic Programming Algorithm

“…According to statistics, fuel consumption costs account for more than 30% of all maintenance costs during the entire working cycle of heavy-duty mining trucks [6,7]. To achieve energy saving and emission reduction, while meeting the power requirements of vehicles, formulating the best economical shift strategy is a current research focus in the field of automatic transmission [8,9].…”

Implementation of an Energy Management Strategy with Drivability Constraints for a Dual-Motor Electric Vehicle

“…Besides, it also has a low manufacturing cost and compact size [12]. The disadvantages of this transmission system, such as vibration and torque interruption while shifting, cannot be ignored, as well as the clutch failures resulting from significant wear [13,14].…”