A method for the prediction of performance is presented in this paper for the design of a vehicle having a split/circulated power transmission with slip elements and planetary gears. Internal power flow patterns of such systems are also theoretically analysed using mathematical modelling. To estimate the usefulness of the designed power transmission, a geometrical approach is proposed by the performance locus diagram which presents the overall characteristics of the system. This enables complete prediction of the qualitative performance and the effect of design factors. These factors are the system layout, the types and gear ratios of the planetary gears and the design parameters of the slip elements. The predicted results of the power transmission are compared with those of experiments using a dynamometer.
Most vehicles equipped with automatic transmissions use torque converter clutches to reduce the fuel consumption, and recently its slip control scheme is studied for the expansion of the operating region of the torque converter clutch and thus for the further improvement of the fuel economy of vehicles. In this article, the analysis of the torque converter clutch system including the line pressure control unit of the automatic transmission and the actuating hydraulic control unit of the torque converter clutch is performed, and a feedback controller for its slip control is designed. The performance of the designed slip controller is verified by simulations and experiments, and the effect of the torque converter clutch slip control on the fuel economy is examined using a driving cycle simulation.
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