Shift control method for automatic transmission
AssigneeHyundai Motor Company
InventorByeong-Wook Jeon
Life of this patent
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Abstract
A shift control method for automatic transmissions includes the steps of outputting a duty control signal for upshifting to a N+1 speed when an N+1 upshifting signal is input during driving in an N speed, pre-estimating a stroke gap of a friction element for the N+1 speed, determining if an N speed kickdown signal is input or not, outputting a duty signal for downshifting to the N speed when the N speed kickdown signal is input. The step of preestimating a stroke gap includes the step of calculating an amount of hydraulic fluid accumulated on a side of the friction element. The step of calculating comprises the steps of calculating an amount of hydraulic fluid with respect to a duty ratio and integrating the calculated amount of hydraulic fluid.
Claims8
A shift control method for automatic transmissions comprising the steps of:
- outputting a duty control signal for upshifting to a N+1 speed when an N+1 upshifting signal is input during driving in an N speed;
- pre-estimating a stroke gap of an engaging friction element for the N+1 speed;
- determining if an N speed kickdown signal is input;
- outputting a duty signal for downshifting to the N speed when the N speed kickdown signal is input.
Dependencies are inferred from the claim text.