Patent ID: 8065064
Filing Date: 2011-11-22
Classification: B60W,F16H,Y10T

Abstract:
1. An automatic transmission comprising: a shift mechanism that executes a shift from a current gear position to a target gear position by engaging or disengaging a plurality of frictional elements selectively; a current thermal load calculating unit which calculates a current thermal load state of the frictional element; a heat generation amount predicting unit which predicts, prior to the start of the shift, a heat generation amount of the frictional element during the shift; a thermal load predicting unit which predicts a thermal load state of the frictional element upon shift completion on the basis of the current thermal load state of the frictional element and the heat generation amount predicted by the heat generation amount predicting unit; and a shift control unit which, when the thermal load state upon shift completion predicted by the thermal load predicting unit is inside a predetermined region, either performs the shift after modifying a shift mode such that the heat generation amount of the frictional element is smaller than that of a case in which the predicted thermal load state upon shift completion is outside the predetermined region, or prohibits the shift, wherein the predetermined region is set at a different region depending on whether the shift is an upshift or a downshift.