Engine start is an important process for a parallel hybrid electric vehicle (HEV), during which the electric motor (EM) must simultaneously provide driver's demand torque and engine-start torque via an engine-disconnect clutch. Therefore, the performance of dynamic and comfort, the engine-start time, and the sliding power of clutch are all supposed to be considered in the control of engine start. This paper introduces a parallel HEV equipped with an automatic dry clutch using an electromechanical actuator, and proposes a hierarchical control method to control the engine start. As upper layer of the controller, a linear quadratic (LQ) optimal control is used to obtain the required torque of EM and clutch based on the current states of the vehicle and engine. As lower layer, a double closed-loop control method is proposed to control the clutch transmitting required torque, which contains a fuzzy controller (FC) as an outer loop and a modified predictive functional controller (mPFC) as an inner loop. Meanwhile, considering the difficulties in measurement of load torque of a running vehicle and actual transmitted torque of a dry clutch, two Kalman filters (KFs) are designed to observe them. Simulations in MATLAB/SIMULINK and hardware-in-loop (HIL) tests were carried out, of which the results show that the hierarchical control method has a satisfying performance.


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    Title :

    Hierarchical Control of Dry Clutch for Engine-Start Process in a Parallel Hybrid Electric Vehicle


    Contributors:
    Xiangyu Wang, (author) / Liang Li, (author) / Chao Yang, (author)


    Publication date :

    2016-06-01


    Size :

    2023642 byte




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



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