Shift control method for dct vehicle
AssigneesHyundai Motor Company, Kia Motors Corporation
InventorSung Hyun Cho
Life of this patent
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Abstract
A shift control method for a dual clutch transmission (DCT) vehicle may include determining whether power-on downshift is initiated, determining a progress degree of a shift process if the power-on downshift is initiated, determining a difference in the number of shift stages between a target shift stage and a current shift stage according to the determined progress degree of the shift process, and selecting and performing one of downshifts (e.g., other shaft full-skip power-on downshift, same shaft power-on downshift, and other shaft power-on downshift) according to the progress degree of the shift process and the shift stage number difference.
Claims11
A shift control method for a dual clutch transmission (DCT) vehicle comprising:
- an initiation determining step of determining whether power-on downshift is initiated;
- a progress determining step of determining a progress degree of a shift process if the power-on downshift is initiated;
- a shift stage number determining step of determining a difference in the number of shift stages between a target shift stage and a current shift stage according to the progress degree of the shift process determined in the progress determining step;
- and
- a shift performing step of selecting and performing one of other shaft full-skip power-on downshift, same shaft power-on downshift, and other shaft power-on downshift according to the progress degree of the shift process and the shift stage number difference.
A shift control method for a dual clutch transmission (DCT) vehicle comprising:
- determining whether power-on downshift is initiated;
- if the power-on downshift is initiated, determining whether the number of rotations of an engine substantially differs from the number of rotations of a disengage-side input shaft and begins to be raised if a difference between the number of rotations of the engine and the number of rotations of the disengage-side input shaft exceeds a given reference value;
- determining whether a difference between a target shift stage and a current shift stage is equal to or more than three stages, if the difference between the number of rotations of the engine and the number of rotations of the disengage-side input shaft is determined to be less than the reference value;
- and
- performing an other shaft full-skip power-on downshift if the difference between the target shift stage and the current shift stage is equal to or more than three stages.
Dependencies are inferred from the claim text.