Abstract
This paper proposes a new supervisory power control algorithm structure for a high mobility hybrid electric military vehicle and new source power distribution strategy that consider the ultra-capacitor. The target vehicle has three different electric energy components, engine/generator, battery, and ultra capacitor. Therefore, the main control strategy of the target vehicle is to optimally distribute demanded power from the power sources in order to deliver appropriate traction power to the traction motors. The proposed algorithm structure is classified into three parts - driver intent determination, mode determination, and power distribution. In the driver intent part, driver’s demand power and state flags, which are necessary information for mode determination, are generated by using driver’s input. In mode determination part, proper hybrid system operating modes are determined based on the state flags. The power distribution part consists of two sub-parts, source power distribution and traction power distribution. In the source power distribution, the supplying power command of each power source is calculated based on the demand power and available power of each power source. In the traction power distribution part, the traction power distribution between the front and rear traction motors is determined based on the vehicle traction and stability requirement. The simulation model of the target vehicle is developed by CRUISE® and the proposed algorithm is realized by using MATLAB/Simulink®. Simulation results show the feasibility and effectiveness of the model and the control algorithm.
Keywords: Series HEV, Military HEV, Control strategy, HEV control algorithm structure, AVL CRUISE®