Interrelated power delivery controls – including engine control – Transmission control – Continuously variable friction transmission
Patent
1995-06-27
1998-07-21
Ta, Khoi Q.
Interrelated power delivery controls, including engine control
Transmission control
Continuously variable friction transmission
477 48, 477 62, 477169, F16H 6104, F16H 900
Patent
active
057827184
ABSTRACT:
A working fluid pressure control device for a hydraulic control system of a V-belt type continuously variable transmission comprises a line pressure regulator valve, a pressure reducer valve, a pressure modifier valve, in which the line pressure regulator valve developing a regulated line pressure for cylinder chambers of driving and driven pulleys of the transmission from a source pressure applied from a hydraulic pump driven by an engine associating with the transmission, the pressure reducer valve developing a reduced output pressure for a forward clutch and a reverse brake of the transmission from a source pressure supplied from the line pressure regulator valve, and the pressure modifier valve developing a pilot pressure for the line pressure regulator valve. There is provided a line pressure characteristics changing means which changes a characteristics of the line pressure relating to at least a transmission ratio, between a higher characteristics and a lower characteristics corresponding to whether a lock-up mechanism of a torque converter of the transmission is executing locking-up or not.
REFERENCES:
patent: 4759236 (1988-07-01), Tezuka et al.
patent: 4846765 (1989-07-01), Sakai
patent: 5211083 (1993-05-01), Hattori et al.
Nissan Motor Co,. Ltd.
Ta Khoi Q.
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