Abstract
As for the engine auxiliary braking conditions of hybrid vehicle equipped with dry dual clutch transmission (DCT), a composite braking torque distribution strategy is proposed, and the control problem of clutch transmitted torque and ISG output torque is researched. Based on the established dynamics equation of DCT shifting process, the target braking torque is extrapolated by fuzzy recognition of driver’s intention, and the motor maximum torque limitation, engine auxiliary braking torque as well as vehicle driving resistance torque are updated at real time, ISG target output torque is calculated according to the proposed composite braking torque distribution strategy. During the shifting process, based on the model and designed disengaging principle, the clutch transmitted torque is obtained. Considering the motor response characteristics and the impact of the synchronization moment, the engine speed reference curve is designed, in view of the external disturbance and model parameter perturbation, the ISG output torque during the synchronization process is obtained by applying linear quadratic optimal tracker and model reference adaptive control. At last, a torque shift phase is designed to avoid the significant impact caused by directly shifting from the in-gear stable operation to the shifting process. The simulation results show that the proposed strategy can make full use of engine auxiliary braking torque and effectively recover the braking energy, and ISG can respond to the changes in the target braking torque, ensuring fast shift.
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