CONTROL APPARATUS FOR AUTOMATIC TRANSMISSION AND CONTROL METHOD FOR AUTOMATIC TRANSMISSION

摘要

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.

主权项

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 a 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.