Design and application of parallel hybrid vehicle simulation platform

A parallel type hybrid-electric bus model is constructed to study hybrid powertrain and its sub-systems. The model is a forward-looking model based on LabVIEW simulation module. The engine, clutch and battery model were specially designed according to the target powertrain. Each part of the model is separately validated by test bench experiment. Part model behavior is compared with that of real target part on dynamic testbed and revised if it was inaccurate. First, offline simulation was adopted to validate rationality and accuracy of the part model. Then, the model was downloaded into a real-time target PC running LabVIEW real-time operation system to study the control strategy of hybrid control unit. Control strategy was studied under three different driving cycles: New York Bus Cycle, Manhattan Cycle, and China City Cycle. The simulation results show that the hybrid-electric bus with good control strategy can improve fuel economy and reduce exhaust emissions.