Vehicle transmission hydraulic circuit fill time learn
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United States of America Patent
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Apr 16, 2019
Grant Date -
Mar 1, 2018
app pub date -
Aug 4, 2017
filing date -
Aug 31, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
A system for controlling transmission shifting includes a controller that receives a shift request signal and determines if a clutch has been unapplied for more than a predetermined time. With a yes determination, a maximum fill time value for hydraulic fluid to be applied to a clutch control circuit is determined, the maximum fill time value being a function of time the clutch has been unapplied and temperature. A signal indicative of an amount of engine RPM flare after the transmission executes the requested shift is received and a modified maximum fill time value is determined as a function of this flare. The modified maximum fill time value is stored as a replacement for the maximum fill time value for use with a subsequent transmission shifts using this clutch, and reduces an amount of air in the control circuit and an amount of flare with subsequent transmission shifts.
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