The Coordinated Control of Plug-in Hybrid Electric Vehicle During Engine Starting in Driving Process 2019-01-0361
The number of internal combustion engine vehicles are growing rapidly, and the resulting energy crisis and air pollution are becoming more and more serious. Pure electric vehicles are subject to imperfect battery technology and infrastructure, the driving mileage and charging time will cause troubles to consumers. Plug-in hybrid electric vehicles (PHEV) incorporating the advantages of traditional internal combustion engine vehicles and pure electric vehicles, can achieve the purpose of energy conservation and emission reduction and has been the research hotspot in the field of new energy vehicles. PHEV has multiple operating modes, when operating mode switching, inadequate control could result in poor ride comfort. Therefore, the research on the smoothness control of the switching mode of the PHEV is crucial.
In this paper, the plug-in hybrid electric vehicle with a Dual-Clutch Automatic Transmission (DCT) is taken as the research object, and the dynamic model of the process which the electric drive mode switching to the engine drive mode is established and analyzed. Aiming at the problem of the vehicle impact caused by the fluctuation of the driving torque of the wheel which is caused by the change of the driving torque of the motor when the engine is started during the pure electric driving, by the way of controlling the DCT clutch slip to reduce the jerk of the vehicle, a clutch pressure Fuzzy-PID control strategy for PHEV mode transition is proposed, which the input values are the speed difference of clutch main and driven disc and the motor angular acceleration. Finally, the strategy proposed is verified through simulation test and road test, the results show that the control strategy proposed in this paper can reduce the jerk and improve the ride comfort of the vehicle during the mode transition process.
Yulong Lei, Pengxiang Song, Yao Fu, Fei Guo