Design and simulation for a Series-parallel Hybrid Electric city-bus

A Series-parallel Hybrid Electric city-bus powertrain scheme was presented. On the basis of ECE drive cycle, component selecting and parameter matching of the powertrain system were implemented, and then logic-threshold power management strategy based on the optimal engine torque was developed. Furthermore, simulation models of vehicle and power management strategy were built, and vehicle kinetic performance and fuel economy were calculated by co-simulation of Cruise and Matlab/Simulink over ECE drive cycle. The simulation results indicate that the desired kinetic performances of the hybrid electric city-bus can be achieved, and its fuel consumption can be reduced by 26% compared to the prototype bus.