Abstract: Based on the detailed analysis of power demand of driver, engine operating area optimization and brake energy recovery strategy, an energy management strategy of hybrid electric vehicle(HEV), together with the hardware and software system of powertrain controller, is developed to analyze specific mild HEV. Through the hardware-in-the-loop test and real vehicle calibration test, the functions of powertrain controller are validated. The test results show that by using this powertrain controller, HEV can achieve better control performance, with not only 16.9% fuel consumption reduced but also lower emis-sions than Euro III.

Key words: Powertrain controller, Control strategy Hardware-in-the-loop simulation, Mild hybrid electric vehicle