Interrelated power delivery controls – including engine control – Transmission control – Continuously variable friction transmission
Reexamination Certificate
2006-07-17
2009-06-30
Pang, Roger (Department: 3655)
Interrelated power delivery controls, including engine control
Transmission control
Continuously variable friction transmission
C477S049000, C477S098000, C701S060000
Reexamination Certificate
active
07553256
ABSTRACT:
A hydraulic control apparatus of a belt-drive CVT, controlling a transmission ratio by changing respective effective rotation radii of driving and driven pulleys, includes vehicle information sensors; hydraulic actuators changing the respective rotation radii; and a control unit determining each fluid pressure command value provided for the pulleys, and controlling the hydraulic actuators based on the fluid pressure command values. The control unit acquires an actual displacement amount of one of the pulleys. When changing a transmission to the highest or lowest speed transmission, the control unit sets a target displacement amount of one of the pulleys; estimates a rapidly changing amount of the working fluid pressure, occurring at close to an end of the speed change; and corrects the fluid pressure command value by the rapidly changing amount at a time when a rate of the actual displacement amount with respect to the target displacement amount has reached a predetermined rate α0.
REFERENCES:
patent: 4761153 (1988-08-01), Morimoto
patent: 6098001 (2000-08-01), Yuasa
patent: 6533702 (2003-03-01), Asyama et al.
patent: 7435200 (2008-10-01), Kim et al.
patent: 5-131295 (1993-05-01), None
Kim Jonggap
Yabe Yasushi
Foley & Lardner LLP
JATCO Ltd
Pang Roger
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