Abstract
Due to the friction-induced discontinuity of the clutch torque and ICE on/off, seamless mode transition of hybrid electric vehicles (HEVs) is difficult to achieve, which has a bad influence on the vehicle ride comfort. In the face of system uncontinuity and strong nonlinearity during mode switching with ICE starting, a control strategy of torque dynamic coordination is proposed by means of sliding mode control based on disturbance compensation. Firstly, the steady-state and transient models of parts and working modes are built, which improves modeling accuracy and adaptability to transient driving cycle. Furthermore, the switching process from pure electric driving to hybrid driving is divided into three phases including internal combustion engine (ICE) starting, speed synchronization and torque redistribution. The design of according disturbance observer and sliding mode controller is described in detail. Lastly, compared with other two control strategies, the rationality and validity of the control method designed are testified not only by computer simulations but also experimental tests under the comprehensive driving cycle of local passenger vehicles. The potential of the proposed control strategy in terms of power transfer smoothness and improving riding comfort is illustrated.
Highlights
It is widely accepted that the development of hybrid electric vehicles (HEVs) is a promising short term solution to better fuel economy and emissions without compromising vehicle performances [1]–[3]
DESIGN OF DYNAMIC COORDINATED CONTROL STRATEGY As to mode switching with internal combustion engine (ICE) starting, there are uncontinuity and strong nolinear in HEV due to clutch engagement/disengagement
To show the effectiveness of the proposed sliding mode control method based on disturbance compensation in the dynamic coordinated control, three control strategies are proposed for the comparison purpose
Summary
It is widely accepted that the development of hybrid electric vehicles (HEVs) is a promising short term solution to better fuel economy and emissions without compromising vehicle performances [1]–[3]. The associate editor coordinating the review of this manuscript and approving it for publication was Huiping Li. to the drivetrains and increase the vehicle jerk, which is uncomfortable to passengers [6]–[8]. To the drivetrains and increase the vehicle jerk, which is uncomfortable to passengers [6]–[8] It is very important for HEVs control to ensure smooth vehicle operation during the mode transition [9]–[11]. Various mode switching methodologies have been applied to HEVs dynamic coordinated control. These proposed methods include online estimation of the ICE speed [12], [13], model predictive control (MPC) [14], [15], disturbance compensation [16], [17], and so on
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