Interrelated power delivery controls – including engine control – Transmission control – Transmission controlled by engine
Reexamination Certificate
2007-07-24
2007-07-24
Ho, Ha (Department: 3681)
Interrelated power delivery controls, including engine control
Transmission control
Transmission controlled by engine
C477S121000
Reexamination Certificate
active
10527872
ABSTRACT:
A method for shifting gears of a transmission of a vehicle, which, during a shift, a first shift element opens and a second shift element closes. To increase the spontaneity and reduce the shifting frequency a downshift from a first gear to a second gear is interrupted without delay and the first gear returned to when an interruption criterion is recognized. The interruption criterion is established when the driver upshifts before a current transmission input speed deviates from a synchronous speed of the first gear or before a time interval, which begins when the speed deviates from the synchronous speed of the first gear, has exceeded a predefined, time-related limit value or before the current transmission input speed has deviated from a synchronous speed of the first gear by a predefined, speed-related limit value or before a pressure of the first shift element falls below a pressure-related limit value.
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Popp Christian
Steinhauser Klaus
Davis & Bujold & Daniels, P.L.L.C.
Ho Ha
ZF Friedrichshafen AG
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