Abstract
As fork-lever actuator has significant advantages in structure dimensions and manufacturing prices, and is able to respond to drivers’ demands in very quick and precise manner, it becomes more and more popular in conventional and electric vehicles (EVs) equipped with dry dual clutch transmission (DDCT). To investigate optimal dynamic behaviors of EV equipped with DDCT, displacements of little ends of diaphragm springs and change rates of such displacements are defined key state variables, and dynamic model of such kind of actuator is built and integrated into DDCT driveline dynamic model of an EV with two-speed. Then, an affine nonlinear launch dynamic model for the whole DDCT system is proposed. Further, optimal torques of electric motor and dual clutch are derived, based on Pontryagin’s minimum principle, mainly for the purpose of smooth power transmission from electric motor to dual clutch. Finally, a sliding mode control algorithm for the feedback linearization system is derived to improve tracking accuracy at the presence of strong nonlinearities and modelling uncertainties. Through careful observation of numerical simulation results from MATLAB/Simulink platform, it can be concluded that the proposed optimal control algorithm is able to improve launch quality to fine level, and sliding mode algorithm for tracking control acquires strong robustness to modeling uncertainties and nonlinearities.
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