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Continuously variable transmission (CVT) offers many advantages to vehicle performance over traditional transmission technologies. A novel cam based CVT was proposed in US patent # 4,603,240, by J. Klovstad and J. Fortune [1], which has a cam input to drive an angle dependent, clutch actuated output shaft. Based on the patented CVT, a kinematic simulation, utilizing three dimensional CAD software was performed, creating a visualization and analysis model to ascertain system performance and feasibility. This article describes the mechanism created, limitation of the modeling software and the approach utilized to overcome these limitations. The resultant motion is then analyzed to ascertain the performance of the mechanism and determine the viability of the design concept. Key improvements to the system are proposed to the design, based on system performance through this analysis.

DTS (Double Transition Shift) transmission can achieve multiple-speed automatic transmission by using minimum number of planetary gear sets and clutches. Historically DTS transmission has been overlooked because of the complexity to perform high quality shifts. In this paper, a vehicle model with a traditional AT (Automatic Transmission) is studied first using Matlab/SimDriveline; the simulation results and the vehicle road test data show good agreement. Then a DTS transmission is established based on the same vehicle model. An open-loop control module is developed. All possible parameters which can influence the shift performance are studied.