Abstract
The mode transition of single-shaft parallel hybrid electric vehicles (HEVs) between engine and motor has an important impact on power and drivability. Especially, in the process of mode transition from the pure motor-drive operating mode to the only engine-drive operating mode, the motor starting engine and the clutch control problem have an important influence on driving quality, and solutions have a bit of room for improving dynamic performance. In this paper, a novel mode transition control method is proposed to guarantee a fast and smooth mode transition process in this regard. First, an adaptive sliding mode control (A-SMC) strategy is presented to obtain the desired torque trajectory of the clutch transmission. Second, a proportional-integral (PI) observer is designed to estimate the actual transmission torque of the clutch. Meanwhile, a fractional order proportional-integral-differential (FOPID) controller with the optimized control parameters by particle swarm optimization (PSO) is employed to realize the accurate position tracking of the direct current (DC) motor clutch so as to ensure clutch transmission torque tracking. Finally, the effectiveness and adaptability to system parameter perturbation of the proposed control approach are verified by comparison with the traditional control strategy in a MATLAB environment. The simulation results show that the driving quality of the closed-loop system using the proposed control approach is obviously improved due to fast and smooth mode transition process and better adaptability.
Highlights
Hybrid electric vehicles (HEVs) have received extensive attention from the automotive industry and academia, and are widely regarded as one of the most effective solutions to the growing use of petroleum fuels for transportation and environmental problems [1,2]
The hybrid system equipped with an automatic clutch and an electric motor (EM) has to perform the mode transition process from the pure electric driving mode to the engine-on driving mode in most conditions, in which the engine needs to be started and engaged into the driveline via the clutch [4,5,6]
Basedparallel on thehybrid configuration characteristics the models of main components of the powertrain related to theof mode single-shaft parallel hybrid powertrain, the simplified schematic of the powertrain model in a mode transition process are given in this part
Summary
Hybrid electric vehicles (HEVs) have received extensive attention from the automotive industry and academia, and are widely regarded as one of the most effective solutions to the growing use of petroleum fuels for transportation and environmental problems [1,2]. The optimal control method is designed in [16] to generate the reference trajectories of the clutch slip speed and motor torque to provide satisfactory performance even under large variation of vehicle mass and road grade Another approach has been extensively studied and utilized, such as triple-step control method [17,18] and backstepping control method [19] are adopted to solve the optimal trajectory tracking problem to achieve accurate clutch control. Motivated by the aforementioned analysis, in this paper, aiming at further improving the control performance of clutch engagement during the mode transition from the pure motor-drive operating mode to the only engine-drive operating mode, a novel control method is proposed to solve the vehicle jerk and clutch slipping energy loss issues of mode transition process.
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