Energy Management Strategy and Control Laws of An Inverse Differential Gear Hybrid Vehicle

This paper presents the Energy Management Strategy (EMS) and control laws of an inverse differential gear hybrid vehicle and also the simulation results for the dynamics response and performance of the system. In the system, an engine and a motor/generator are attached to the side gears individually and the power is transmitted through plenary gear to ECVT. By regulating the gear ratio of ECVT and the power outputs between engine and motor/generator, desired system dynamics can be achieved. The goal is to control the system dynamics such that the engine dynamics can be fixed at an optimal operation point while meeting the driver desire of vehicle speed in hybrid operation. While in pure engine or pure motor or brake regeneration modes, optimal gear ratio and engine operation or motor/generator operation to achieve fuel efficiency are the goal of the control laws. Simulation results show that the fuel consumption can be reduced to half of the original engine driven vehicle. Similar improvements can also be found in the performance of CO, HC, and NOx emission.