With the popularization of easy driving in Japan, the quest to improve the fuel economy and vehicle performance of a small car with a torque converter automatic transmission (AT) has led to the development of the Electro Continuously Variable Transmission (ECVT). The Subaru ECVT which combines an electronically controlled magnetic powder clutch with the van Doorne's steel belt drive system employs a couple of conventional synchromeshes as a means of forward/reverse change-over mechanism and simple hydraulic control valves. This combination has realized smoothness and quick response of CVT operation and provides a compact size for the CVT with the weight of 45.4 kg. Fuel economy of Subaru Justy ECVT car with the one liter engine is thus improved by 15 to 20 % in Japanese 10-mode test cycle and at the 60 km/H constant speed respectively in comparison with that of three speeds torque converter AT. The description of the transmission and its control strategy including the powder clutch are presented.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    The “ECVT” Electro Continuously Variable Transmission


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE International Congress and Exposition ; 1988



    Publication date :

    1988-02-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    The "ECVT" electro continuously variable transmission

    Sakai,Y. / Fuji Heavy Industries,JP | Automotive engineering | 1988




    ECVT for Tractors — Continuously Variable Driving and Electric Power for Implement Drives

    Himmelsbach, R. / Pohlenz, J. / Grad, K. | British Library Conference Proceedings | 2019


    Justy ECVT

    Coffman,C. / Subaru Motor,JP | Automotive engineering | 1989