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The purpose of this paper is to synthesize systematically the feasible configurations of series-parallel hybrid transmissions for automotive systems utilized in passenger vehicles subject to the deduced design constraints. The design process includes the following steps: first, search for all feasible mechanisms that can be used for synthesizing hybrid transmissions; second, identify all potential locations for the inputs and the output to the mechanisms; third, identify all potential locations for clutches and the brakes of the systems subject to the required operation modes. Through the proposed design process, 30 planetary gear trains for hybrid electric vehicle transmissions with seven members and 10 joints are generated. The power arrangement process generates 42 clutchless hybrid systems. Then, the clutch arrangement process generates 48 corresponding series-parallel transmissions. To demonstrate the feasibility of the synthesized configurations, a novel configuration system is taken as a numerical example to illustrate the principles of operation and performance.

This work presents a systematic approach to improve the kinematic and dynamic characteristics of plate cam mechanisms by using the Bezier curve as the input speed trajectory. The analytical models of kinematic and dynamic designs for a variable-speed plate cam mechanism are derived first. Speed trajectories of the cam are obtained by employing the Bezier curve. Then, an approach to integrate kinematic and dynamic designs for motion adaptation and to reduce the input torque at the same time based on multi-objective optimization is proposed. Two examples are provided for the design models to illustrate the design process. Finally, an experimental set-up is established, and the data of related characteristics is measured to verify the proposed design for variable-speed plate cam mechanisms.

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