Control apparatus for automatic transmission and control method for automatic transmission
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United States of America Patent
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May 12, 2015
Grant Date -
Apr 23, 2015
app pub date -
Sep 29, 2014
filing date -
Oct 23, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
A control apparatus for an automatic transmission that selectively engages a plurality of frictional engaging elements for shift control includes a shift instruction device, a temperature calculator, an engageability determiner, an engagement delay device, a load calculator, a cumulative load calculator, and a threshold temperature changer. The engageability determiner is configured to determine whether at least one of the plurality of frictional engaging elements is engageable or not based on a comparison between a temperature of the at least one of the plurality of frictional engaging elements calculated by the temperature calculator and a predetermined threshold temperature in a case where the shift instruction device outputs a shift instruction. The threshold temperature changer is configured to change the predetermined threshold temperature in a case where a cumulative load calculated by the cumulative load calculator reaches a value greater than or equal to a predetermined value.
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