Optimization of Power Hybrid Control Strategy Parameters of Hybrid Bus

It was studied the optimization of power control strategy parameters for reduction of gas consumption of a series-parallel LNG-electricity hybrid bus. The control parameters included the up and low limit value of SOC of super-capacitor, limited speed of vehicle in pure electric model, shutoff torque coefficient of engine and charging coefficient. The optimization was carried out by joint simulation by coupling the performance simulation model of vehicle and the optimization model of control parameters. It was applied DOE of Latin hypercube in simulation test, and set up relationship between control parameters with gas consumption by approximate model of quadratic response. The optimal value of control parameters was gotten with Multi-island genetic algorithm, and the gas consumption of bus was reduced effectively.