Optimal Control of Hybrid to Electric Mode Transition for DCT Four-wheel Drive HEV

doi:10.3901/JME.2019.22.140

Abstract

Abstract: When driving under non-emergency braking conditions in a straight line, dual clutch transmission(DCT) four-wheel drive hybrid electric vehicle(HEV) is often transited from the engine-worked four-wheel hybrid drive mode to the rear hub motor-worked electric drive mode to improve the energy conversion efficiency of the vehicle. However, the mode transition process is accompanied by the front-to-rear conversion of the driving torque and the load. The mode transition process involves both the torque coordinated control of the multi-power source and the vehicle longitudinal dynamics. If improperly controlled, it often causes a large longitudinal jerk of the vehicle. For the hybrid to pure electric drive mode transition process of DCT four-wheel drive HEV in straight driving condition, based on the five-degree-of-freedom vehicle longitudinal dynamics and the motor torque/speed fast response advantages to compensate for engine torque response hysteresis and clutch torque fluctuation, model predictive optimization control strategies for front and rear power sources transition process are developed. The off-line simulation and hardware-in-the-loop test results show that the proposed model predictive optimization control strategies can not only smoothly complete the transition of the power from front axle to rear axle, but also control the vehicle longitudinal jerk within 5 m/s³. Besides, it also has a good robust suppression on vehicle parameter perturbation and sensor measurement noise.

Key words: four-wheel drive hybrid electric vehicle, dual clutch transmission, hybrid to electric drive mode, mode transition, model predictive control

CLC Number:

TG156

ZHAO Zhiguo, NI Runyu, JIANG Siwen, LEI Dan. Optimal Control of Hybrid to Electric Mode Transition for DCT Four-wheel Drive HEV[J]. Journal of Mechanical Engineering, 2019, 55(22): 140-152.

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