Patent ID: 9031753
Filing Date: 2015-05-12
Classification: F16H

Abstract:
1. A control apparatus for an automatic transmission that selectively engages a plurality of frictional engaging elements for shift control, the control apparatus comprising: a shift instruction section that issues a shift instruction; a temperature calculator that calculates a temperature of at least one of the frictional engaging elements; an engageability determiner that determines whether the at least one of the frictional engaging elements is engageable or not on the basis of a comparison between the temperature of the at least one of the frictional engaging elements calculated by the temperature calculator and a predetermined threshold temperature when the shift instruction section issues the shift instruction; an engagement delay section that, if the engageability determiner determines that the one of the frictional engaging elements is non-engageable, delays engagement of the at least one of the frictional engaging elements until the at least one of the frictional engaging elements is determined to be engageable; a load calculator that calculates a load input to each of the frictional engaging elements when the automatic transmission performs shift operation; and a cumulative load calculator that calculates a cumulative load of accumulated loads calculated by the load calculator, wherein the engageability determiner changes the threshold temperature for determining whether the at least one of the frictional engaging elements is engageable or not when the cumulative load calculated by the cumulative load calculator reaches a value greater than or equal to a predetermined value.