Platform: Modelica（Dymola），SIMTEK New Energy Vehicle Library
As the change of vehicle powertrain system to electrification, the vehicle structure has become more different and complex than before casuse by the more and more interactions between vehicle subsystems. The functions and integration of subsystems have become more closely and interdependent, which means that engineering departments, which work independently before, now must collaborate more extensively to develop the best solutions at the vehicle level.
New energy vehicles are more energy-saving and environmentally friendly than traditional fuel vehicles, but at the same time, the structure and control system of the whole vehicle are more complex. Therefore, the computing simulation technology can greatly improve the speed and quality of development in the process of research and development.
Based on the new energy vehicle model library, the energy consumption of a class A HEV under WLTP test conditions is analyzed. Fig. 1 shows the HEV powertrain structure based on power splitting, which is tested under the condition that the initial SOC of the power battery is 0.4. In Figure 3, it shows that during the test process, the motor power is the major output , and the braking force gives a feedback recovery, so that the engine only intervene at the higher power output point. Therefore, the HEV's 100 km fuel consumption is only 1.8L under the test condition , which is much lower than the same level of fuel vehicles.