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AssigneeZF Friedrichshafen AG
InventorsChristian Popp, Klaus Steinhauser
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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.
1-19. (canceled)
A method for carrying out gear shifts of an automatic transmission of a motor vehicle, in particular overlap gear shifts in which, during a gear shift, a first shift element made as one of a clutch or brake is opened and a second shift element made as one of a clutch or brake closes, such that to increase spontaneity and reduce shifting frequency of the automatic transmission, a downshift from a first gear (i1) to a second gear (i2) is interrupted without delay and the first gear is returned to when an interruption criterion is recognized, the interruption criterion is established when it is recognized that a driver of the motor vehicle has called for an upshift before a current transmission input speed (n_T) has deviated from a synchronous speed of the first gear (i1) by a predefined, speed-related limit value, this speed-related limit value being specified as a function of an intensity of a change of a driver's wish, in particular as a function of one or more of a speed and size of a change of a accelerator pedal angle (FPW).
Dependencies are inferred from the claim text.