Date of Publication :8th March 2018
Abstract: Dual clutch transmissions (DCTs) refer to the double friction clutches; in the vehicle shift gearbox they are designed and fully automated.The greatest advantage of the DCTs is the fuel economy boost as the power transfer from the engine to the transmission, always has a very high coefficient of friction and is not disturbed.Similar to the traditional six-speed automatic gearbox, the new six-speed DCTs will provide more than 10 per cent improved fuel economy.This paper describes three types of vehicles: conventional dual-clutch transmission (DCT); conventional hybrid electric vehicle (HEV); dual-clutch hybrid (HDCT). They're simulated on various drive-cycles.HEV and HDCT demonstrated superiority on low-speed fuel savings. Due to the higher performance of clutches to torque converters, HDCT displays a little bit higher energy saving over HEV. Conclusions and recommendations are also provided for enhancing DCT, HEV, and HDCT.Higher energy efficiency than automatic transmission systems with torque converters and the ability to fill the torque gap during gear shifts to allow seamless longitudinal acceleration profiles are the main advantages of double clutch transmissions (DCTs).
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