Interrelated power delivery controls – including engine control – Transmission control – Continuously variable friction transmission
Patent
1997-10-24
1999-10-05
Wright, Dirk
Interrelated power delivery controls, including engine control
Transmission control
Continuously variable friction transmission
477 43, 477 46, F16H 3702
Patent
active
059614188
ABSTRACT:
An infinitely variable transmission has a gear neutral (GN) point and serves as an output member by torque circulation. When a pulley ratio thereof is within a predetermined range from the GN point, a coasting state occurs which may hinder smooth torque transmission based on the transmission efficiency and generate a great engine braking effect (failure in the transmission resulting from the coasting state) based on a large gear ratio. When the pulley ratio assumes a predetermined value that may cause failure in transmission resulting from the coasting state, upon release of the accelerator pedal, an electronic throttle system performs control such that the engine outputs a predetermined torque. Thus a positive driving state is always established. In this state, the continuously variable transmission (CVT) is shifted in the upshift direction to escape rapidly from a range defined by the pulley ratio of the predetermined value.
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SAE 1991 Transaction Journal of Passenger Cars, vol. 100, No. sect. 6, Apr. 9, 1991, "Modeling, Simulation, and Control Implementation for a Split-Torque, Geared Neutral, Infinitely Variable Transmission", Vahabzadeh and Linzell, pp. 552-557.
Hattori Masashi
Inuzuka Takeshi
Miyagawa Shoichi
Nozawa Hirofumi
Sakakibara Shiro
Aisin Aw Co. Ltd.
Kwon Peter T.
Wright Dirk
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