Method of controlling shift action in up-shift mode operation of automatic transmission for vehicles
AssigneeHyundai Motor Company
InventorByeong-Wook Jeon
Life of this patent
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Abstract
A method of controlling the shift action in an up-shift mode operation of an automatic transmission for vehicles is disclosed. The method appropriately controls such a shift action by a transmission control unit integrated with an engine control unit, thus restricting turbine blow-up during the shift action, stabilizing the learning process of turbine rpm blow-up, reducing an excessive blow-up learning value to an acceptable level, and thereby accomplishing desired smoothness of the shift action, in addition to improving durability of automatic transmissions.
Claims14
A method of controlling shift action in an up-shift mode of an automatic transmission for vehicles, comprising:
- determining whether a turbine blow-up value is higher than a predetermined reference value when a shift command is applied during operation of the vehicle;
- performing blow-up learning control in proportion to the turbine blow-up value when the blow-up value is higher than the reference value and
- performing engine torque reduction control during said performing blow-up learning control in proportion to the turbine rpm blow-up value.
A method of controlling shift action in an up-shift mode of an automatic transmission for vehicles, comprising:
- determining whether a turbine blow-up amount is higher than a predetermined reference value when a shift command is applied;
- performing blow-up learning control in proportion to the turbine blow-up amount, and
- performing engine torque reduction control when the blow-up amount is higher than the reference value;
- determining whether turbine rpm tie-up is generated when it is determined that the turbine blow-up amount is not higher than the reference value;
- performing tie-up learning control when it is determined that turbine rpm tie-up is generated;
- and
- performing a normal control when it is determined that turbine rpm tie-up is not generated.
A method of controlling shift action in an up-shift mode of an automatic transmission for vehicles, comprising:
- performing a mechanical shift action for an automatic transmission from a lower gear to a higher gear in response to a shift command;
- monitoring turbine rpm during said mechanical shift action;
- monitoring time between the shift command and initiation of said mechanical shift action;
- determining whether said turbine rpm is greater than a reference rpm;
- determining whether said time is less than a reference time when said turbine rpm is less than said reference rpm;
- performing tie-up learning control when said time during said mechanical shift action is less than said reference time;
- performing a normal control when said time during said mechanical shift action is not less than said reference time and
- increasing transmission oil pressure and reducing engine torque in proportion to said turbine rpm when said turbine rpm is greater than said reference rpm.
Dependencies are inferred from the claim text.