Shift method for a dual-clutch transmission for vehicles
AssigneeGM Global Technology Operations LLC
InventorGoetz HANGEN
Life of this patent
Estimating the term…
Abstract
A shift method is provided for a vehicle transmission. In the vehicle transmission, forward gears are operated using at least one engine clutch via at least one transmission drive shaft. A downshift from one of the forward gears to another of the forward gears, which are assigned to the at least one engine clutch or the at least one transmission drive shaft, is performed in that synchronizing clutches of the intermediate gears, which are between one of the forward gears and the other of the forward gears on the same transmission drive shaft, are successively operated.
Claims20
A shift method for a vehicle transmission, comprising:
- operating a plurality of forward gears using a clutch via a transmission drive shaft;
- performing a downshift from a first forward gear of the plurality of forward gears to a second forward gear of the plurality of forward gears;
- and
- operating a plurality of synchronizing clutches of a plurality of intermediate gears that are between the first forward gear and the second forward gear on the transmission drive shaft.
A shift method for a vehicle transmission, comprising:
- operating a plurality of forward gears using an engine clutch via a transmission drive shaft;
- performing a downshift from a first forward gear of the plurality of forward gears to a second forward gear of the plurality of forward gears;
- releasing a high forward gear;
- disengaging a synchronizing clutch;
- reactivating the engine clutch;
- accelerating the transmission drive shaft with an engine to a higher speed;
- and
- deactivating the engine clutch and activating the synchronizing clutch of a lower forward gear before reaching an increased speed of the transmission drive shaft.
A computer readable medium embodying a computer program product, said computer program product comprising:
- a shift program for a vehicle transmission, the shift program configured to:
- operate a plurality of forward gears using a clutch via a transmission drive shaft;
- perform a downshift from a first forward gear of the plurality of forward gears to a second forward gear of the plurality of forward gears;
- and
- operate a plurality of synchronizing clutches of a plurality of intermediate gears that are between the first forward gear and the second forward gear on the transmission drive shaft.
A computer readable medium embodying a computer program product, said computer program product comprising:
- a shift program, the shift program configured to:
- operate a plurality of forward gears using an engine clutch via a transmission drive shaft;
- perform a downshift from a first forward gear of the plurality of forward gears to a second forward gear of the plurality of forward gears;
- release a high forward gear;
- disengage a synchronizing clutch;
- reactivate the engine clutch;
- accelerate the transmission drive shaft with an engine to a higher speed;
- and
- deactivate the engine clutch and activating the synchronizing clutch of a lower forward gear before reaching an increased speed of the transmission drive shaft.
Dependencies are inferred from the claim text.