Gear selection strategy for a dual clutch transmission
AssigneeFord Global Technologies, LLC
InventorReid A. Baldwin
Life of this patent
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Abstract
A method for controlling gear shifts in a multiple speed power transmission for a vehicle that includes a first clutch for transmitting power through a first power path producing a reverse gear, and a second clutch for transmitting power through a second power path producing a forward gear. The method includes selecting a reverse range in which the transmission is to operate, preparing the transmission to transmit power alternately through the first power path and second power path; engaging the first clutch and transmitting power through the first power path in the reverse gear, selecting a forward range in which the transmission is to operate, disengaging the first clutch and engaging the second clutch, and transmitting power through the second power path in the forward gear.
Claims14
A method for controlling gear shifts in a transmission, comprising the steps of:
- engaging a first coupler that driveably connects a first input shaft to an output through a first power path;
- after the first coupler is engaged, engaging a clutch coupler that driveably connects a second input shaft to the output through a second power path that includes the first input shaft;
- engaging a first clutch to connect an input and the output through the clutch coupler and the second power path;
- disengaging the first clutch and engaging a second clutch to connect the input and the output through the first coupler and the first power path.
A method for controlling gear shifts in a transmission, comprising the steps of:
- engaging a first coupler that driveably connects a first input shaft to an output through a first power path that produces a first forward gear;
- and
- after the first coupler is engaged, engaging a clutch coupler that driveably connects a second input shaft to the output through a second power path that includes the first input shaft and produces a second forward gear lower than the first gear;
- engaging a first clutch to connect an input and the output and produce the second gear through the clutch coupler and the second power path.
A method for controlling gear shifts in a transmission, comprising the steps of:
- engaging a first coupler that driveably connects a first input shaft to an output through a first power path that produces a first reverse gear;
- after the first coupler is engaged, engaging a clutch coupler that driveably connects a second input shaft to the output through a second power path that includes the first input shaft and produces a second reverse gear lower than the first gear;
- engaging a first clutch to connect an input and the output and produce the second reverse gear through the clutch coupler and the second power path.
Dependencies are inferred from the claim text.