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US 6,656,086 B2Granted
Shift control method for an automatic transmission of a vehicle
AssigneeHyundai Motor Company
InventorChang-Gi Yeo
Life of this patent
Estimating the term…
Abstract
In order to consider a vehicle driving altitude in a shift control method, an atmospheric pressure is detected, values of shift control variables are reset based on the detected atmospheric pressure when a predetermined atmospheric pressure applying condition is satisfied, and shifting is controlled on the basis of the reset values of the shift control variables.
Claims7
A shift control method for an automatic transmission of a vehicle comprising:
- detecting atmospheric pressure;
- determining whether a predetermined atmospheric pressure applying condition is satisfied;
- and
- resetting values of shift control variables based on the detected atmospheric pressure when the predetermined atmospheric pressure applying condition is satisfied the shift control variables being variables for duty control of hydraulic pressure for friction elements of the automatic transmission, wherein the shift control variables of which the values are reset comprise at least one of:
- an initial release-duty (Dsr) for suddenly lowering a release duty for hydraulic pressure supplied to a release-element, a ramp-control slope (dDr) for gradually decreasing the release duty for the release-element from the initial release-duty (Dsr), and a high-holding duty (Dcr) for holding duty at a higher lever than a final duty of the ramp-control.
2 more elements
A shift control method for an automatic transmission of a vehicle comprising:
- detecting atmospheric pressure;
- determining whether a predetermined atmospheric pressure applying condition is satisfied;
- and
- resetting values of shift control variables based on the detected atmospheric pressure when the predetermined atmospheric pressure applying condition is satisfied the shift control variables being variables for duty control of hydraulic pressure for friction elements of the automatic transmission wherein:
- the atmospheric pressure applying condition includes the automatic transmission not undergoing shifting, and
- the determining whether the predetermined atmospheric pressure applying condition is satisfied determines that the predetermined atmospheric pressure applying condition is not satisfied if the automatic transmission is undergoing shifting.
3 more elements
A shift control method for an automatic transmission of a vehicle comprising:
- detecting atmospheric pressure:
- determining whether a predetermined atmospheric pressure applying condition is satisfied;
- and
- resetting values of shift control variables based on the detected atmospheric pressure when the predetermined atmospheric pressure applying condition is satisfied the shift control variables being variables for duty control of hydraulic pressure for friction elements of the automatic transmission wherein:
- the atmospheric pressure applying condition includes a change rate of a throttle valve open-angle being within a predetermined change rate range, and
- the determining whether the predetermined atmospheric pressure applying condition is satisfied determines that the predetermined atmospheric pressure applying condition is not satisfied if the change rate of the throttle valve open-angle is out of the predetermined change rate range.
3 more elements
A shift control method for an automatic transmission of a vehicle comprising:
- detecting atmospheric pressure;
- determining whether a predetermined atmospheric pressure applying condition is satisfied;
- and
- resetting values of shift control variables based on the detected atmospheric pressure when the predetermined atmospheric pressure applying condition is satisfied the shift control variables being variables for duty control of hydraulic pressure for friction elements of the automatic transmission wherein:
- the atmospheric pressure applying condition includes the detected atmospheric pressure not being abnormal,
- the determining whether the predetermined atmospheric pressure applying condition is satisfied determines that the predetermined atmospheric pressure applying condition is satisfied only if the detected atmospheric pressure is not abnormal, and
- the determining whether the predetermined atmospheric pressure applying condition is satisfied comprises resetting the detected atmospheric pressure as a predetermined atmospheric pressure if the detected atmospheric pressure is abnormal.
4 more elements
Dependencies are inferred from the claim text.