Abstract
Driving mode switches of hybrid vehicles are significant events. Due to the different dynamic characteristics of the engine, motor, and wet clutch, it is difficult to coordinate torque fluctuations caused by mode switches. This paper focused on a control strategy for driving mode switches of plug-in hybrid electric vehicles (PHEVs) with a multi-disk wet clutch. First, the dynamic model of the PHEV was established, and a rule-based control strategy was proposed to divide the working mode regions and distribute the torque between engine and motor. Second, the dual fuzzy control strategy for a wet clutch and the coordinated torque control strategy for driving mode switches were proposed. The dual fuzzy logic control system consisted of the initial pulse-width modulation (PWM)’s duty cycle control and the changing rate of the PWM’s duty cycle control. Considering the difference in the dynamic characteristics between engine, motor, and wet clutch, a coordinated control strategy for the driving mode switches of PHEVs was put forward. Third, simulations of driving mode switches between pure electric driving mode and only engine driving mode were conducted. The results showed that the proposed control strategy could reduce the torque ripple and the jerk of the vehicle, completely satisfying the requirements of China. Finally, the control strategy for the motor-assisted engine starting process was tested on the bench. The experiment results indicated that the proposed control strategy was effective.
Highlights
The energy crisis and environmental pollution are becoming more and more serious
Plug-in hybrid electric vehicles (PHEVs) have attracted significant research attention because they assume an essential role in decreasing fuel consumption and reducing pollutant emissions [3,4,5]
It is necessary to control the dynamic process of driving mode switches effectively to reach a coordinated work state between engine, motor, and clutch [10,11,12]
Summary
The energy crisis and environmental pollution are becoming more and more serious. The energy demand from road traffic is increasingly growing, and the emissions due to road traffic are almost always an important fraction of the total emissions of a territory [1,2]. It is necessary to control the dynamic process of driving mode switches effectively to reach a coordinated work state between engine, motor, and clutch [10,11,12]. Wang et al proposed a novel mode switch control strategy based on an MPC algorithm to control the immediate torques of the engine, the motor, and the automatic clutch [23]. The authors knew that it was necessary to conduct research on a real-time control strategy for mode switches while considering the clutch dynamic characteristic. The dynamic model of the PHEV was established, and a rule-based control strategy was proposed to divide the working mode regions and distribute the torque between engine and motor.
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