Shift Control Method and System of Automatic Transmission
AssigneesHyundai Motor Company, Kia Motors Corporation
InventorByeong Wook JEON
Life of this patent
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Abstract
A shift control method of an automatic transmission controls a skip shift from a first shift-speed achieved by engagements of first and second frictional elements to a second shift-speed achieved by engagements of third and fourth frictional elements, wherein the engagements of the third and fourth frictional elements is controlled after completion of releases of the first and second frictional elements.
Claims30
A shift control method of an automatic transmission that controls a skip shift from a first shift-speed achieved by engagements of first and second frictional elements to a second shift-speed achieved by engagements of third and fourth frictional elements,
- wherein the engagements of the third and fourth frictional elements is controlled after completion of releases of the first and second frictional elements.
A shift control system of an automatic transmission comprising a transmission control unit controlling a shift and an engine control unit controlling an engine torque, based on a driving condition of a vehicle,
- wherein the transmission control unit controls the shift from a first shift-speed achieved by engagements of first and second frictional elements to a second shift-speed achieved by engagement of third and fourth frictional elements, and
- wherein the transmission control unit controls the engagements of the third and fourth frictional elements after the engagements of the first and second frictional elements are completed.
A shift control method of an automatic transmission that controls a skip shift from a first shift-speed achieved by an engagement of at least one off-going element to a second shift-speed achieved by an engagement of at least one on-coming element,
- wherein a shift control is performed after a release of the off-going element is completed such that an intermediate shift-speed between the first shift-speed and the second shift-speed is not achieved.
A shift control method of an automatic transmission that controls a skip shift from a first shift-speed to a second shift-speed,
- wherein an engagement of an on-coming element that is engaged at the second shift-speed begins after a release control of an off-going element that is engaged at the first shift-speed begins, and the engagement of the on-coming element is completed after the release of the off-going element is completed, and
- wherein the release control of the off-going elements are simultaneously begun in a case that at least two off-going elements exist.
A shift control method of an automatic transmission that controls a skip shift from a first shift-speed to a second shift-speed,
- wherein an engagement of at least one on-coming element that is engaged at the second shift-speed begins after a release control of at least one off-going element that is engaged at the first shift-speed begins, and the engagement of at least one on-coming element is completed after the release of at least one off-going element is completed, and
- wherein the engagements of the on-coming elements are simultaneously completed in a case that at least two on-coming elements exist.
A shift control method of an automatic transmission that controls a skip shift from a first shift-speed to a second shift-speed,
- wherein a neutral control where hydraulic pressure supplied to frictional elements is not controlled is performed before an engagement of at least one on-coming element that is engaged at the second shift-speed begins after a release control of at least one off-going element that is engaged at the first shift-speed begins.
A shift control method of an automatic transmission that controls a skip shift from a first shift-speed achieved by engagements of first and second frictional elements to a second shift-speed achieved by engagements of third and fourth frictional elements and shifted by two speed steps from the first shift-speed,
- wherein a neutral control where hydraulic pressure supplied to the frictional elements is not controlled is performed before the engagements of the third and fourth frictional elements are controlled after the releases of the first and second frictional elements are completed.
Dependencies are inferred from the claim text.