Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Transmission control
Reexamination Certificate
2008-01-08
2008-01-08
Zanelli, Michael J. (Department: 3661)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Transmission control
C477S097000
Reexamination Certificate
active
07317979
ABSTRACT:
In a speed change control system of an automatic transmission incorporated with an engine, there are provided a speed change mechanism that is able to establish a forward speed or a reverse by engaging a hydraulically operated friction element upon switching of the transmission from a non-travel range to a travel range; and a control unit that controls the hydraulically operated friction element in such a manner that a hydraulic pressure applied to the friction element is feedback controlled in such a manner that when the engine is under a lower load condition, a rate of speed change of rotation of an input shaft of the transmission has a first target rate. The control unit is configured to set the rate of speed change of the input shaft to a second target rate smaller than the first target rate when, upon switching of the transmission from the non-travel range to the travel range, the engine is under a higher load condition; and configured to control the hydraulic pressure of the friction element in a feedback control manner so that the rate of speed change of the input shaft has the second target rate.
REFERENCES:
patent: 5209332 (1993-05-01), Okayasu
patent: 6176812 (2001-01-01), Taki et al.
patent: 2005/0170930 (2005-08-01), Fett et al.
patent: 5-322027 (1993-12-01), None
Foley & Lardner LLP
Jatco Ltd
Zanelli Michael J.
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