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GU Yanchun
YIN Chengliang
ZHANG Jianwu
School of Mechanical Engineering,
Shanghai Jiaotong University,
Shanghai 200030, China
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OPTIMAL TORQUE CONTROL
STRATEGY FOR PARALLEL HYBRID
ELECTRIC VEHICLE WITH AUTOMATIC
MECHANICAL TRANSMISSION*
Abstract:
In parallel hybrid electrical vehicle (PHEV) equipped with automatic mechanical transmission (AMT), the driving smoothness and the clutch abrasion are the primary considerations for powertrain control during gearshift and clutch operation. To improve these performance indexes of PHEV, a coordinated control system is proposed through the analyzing of HEV powertrain dynamic characteristics. Using the method of minimum principle, the input torque of transmission is optimized to improve the driving smoothness of vehicle. Using the methods of fuzzy logic and fuzzy-PID, the engaging speed of clutch and the throttle opening of engine are manipulated to ensure the smoothness of clutch engagement and reduce the abrasion of clutch friction plates. The motor provides the difference between the required input torque of transmission and the torque transmitted through clutch plates. Results of simulation and experiments show that the proposed control strategy performs better than the contrastive control system, the smoothness of driving and the abrasion of clutch can be improved simultaneously.
Key words:
Parallel hybrid electric vehicle (PHEV) Automatic mechanical transmission (AMT)
Driving smoothness Clutch abrasion Optimal control Fuzzy logic control
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