Simulation Research On Energy Management Strategy Of EVT-based Hybrid Vehicle Powertrain

Green-energy vehicles as the focus of national development received a sustained attention,power splitting(Electronically Variable Transmission,EVT)hybrid vehicles are the most widely used models,because of its configuration,where in the engine operating conditions can be achieved decoupled with reasonable energy management strategy,with a great potential of energy efficient.In this paper,EVT hybrid vehicle as the research object,through the kinematics analysis of EVT structure and parameter matching,has developed a rule-based energy management strategy and implemented hardware-in-loop testing of energy management strategies.The main research results are as follows:First of all,the configuration and movement of EVT were analyzed,followed by vehicle parameters(maximum speed,maximum climbing,acceleration time to 100km/s,100 km fuel consumption),and matched the power source parameters.,to determine the engine,motor,generator,power battery parameters selection.A type of energy strategy based on rule of EVT hybrid vehicle has been developed,and the vehicle and control strategy are modeled in Matlab / Simulink environment,which lays the foundation for Matlab / Cruise combined simulation and hardware ring simulation.Meanwhile in the Matlab / Simulink environment,the vehicle dynamic performance was verified,at the same time on the city(UDC),suburbs(CTUDC),high way(EUDC)three conditions under the simulation test.Simulation results showed that the vehicle 100 km/h acceleration time was 12.6s,the maximum speed was 190km/h,in three cases under the 100 km fuel consumption were 3.6L,4.1L,4.7L.The Cruise / Simulink combined simulation model of the EVT hybrid vehicle was established,and the driver and vehicle model were established in the Cruise software environment,and the energy management strategy established in Simulink was imported into Cruise for combined simulation.Simulation results showed that the vehicle 100 km/h acceleration time was 12.0s,the maximum speed was 190km/h,in three cases under the 100 km fuel consumption were 3.76 L,4.2L,4.45 L.It shows that the driver and vehicle model are reliable in the MATLAB / Simulink environment,and the control strategy is verified by the professional simulation software,which lays a good foundation for the hardware simulation.Conducted a hardware-based test based on the CAN bus simulation environment and the driver's energy management strategy in the ring.Firstly,the CANoe / MATLAB joint simulation of the integrated CAN bus simulation environment is carried out.The baud rate is 26% in the simulation process,and the real-time performance is good for the hardware simulation.Based on the automatic code generation technology,developed vehicle controller based on MotoTron.Finally,the power management strategy based on VTSystem is implemented by key switch power and driver pedal operation.HIL simulation results showed that the vehicle 100 km/h acceleration time was 14.0s,the maximum speed was 190km/h,in three cases under the 100 km fuel consumption were 3.5L,4.4L,4.5L,The error with the results of the software simulation is 5%.