Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Transmission control
Reexamination Certificate
2005-10-04
2009-06-09
Beaulieu, Yonel (Department: 3661)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Transmission control
C474S028000, C474S018000
Reexamination Certificate
active
07546196
ABSTRACT:
In a line pressure control apparatus of a belt-drive CVT, a shift is achieved by varying V- groove widths of primary and secondary pulleys by a differential pressure between primary and secondary pulley pressures, originating from line pressure. The differential pressure is created by bringing a shift actuator, such as a step motor, into a control position corresponding to a target transmission ratio. The target transmission ratio is calculated based on a theoretical transmission ratio based on engine-and-vehicle operating conditions, taking account of a hardware response delay and a disturbance. The target transmission ratio is converted into a reference-model operative position, corresponding to a reference-model number-of-steps of the shift actuator. An actual transmission ratio is converted into an actual-transmission-ratio related operative position. Line pressure is corrected in a manner so as to reduce the positional deviation between the reference-model operative position and the actual-transmission-ratio related operative position.
REFERENCES:
patent: 4826467 (1989-05-01), Reese et al.
patent: 5184981 (1993-02-01), Wittke
patent: 7351173 (2008-04-01), Uchisasai et al.
patent: 2004-100737 (2004-04-01), None
Iida Toshiji
Izumi Tetsuya
Kim Seonjae
Nihei Hironori
Tanaka Takayuki
Beaulieu Yonel
Foley & Lardner LLP
JATCO Ltd
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