Patent ID: 6666794
Filing Date: 2003-12-23
Classification: F16H,Y10T

Abstract:
An apparatus for controlling an automatic transmission comprising:a plurality of friction engagement elements; oil pressure supply passages each for supplying an oil pressure to a respective one of said plurality of friction engagement elements; an accumulator disposed in each said oil supply passage; a shift valve assembly for switching the oil supply to said plurality of friction engagement element; a control valve assembly which adjusts a back pressure of each said accumulator; and a controller for controlling said shift valve assembly and said control valve assembly to perform a speed change, wherein said controller comprises: a racing detection unit for detecting a racing of engine during said speed change; and an accumulator back pressure control unit for increasing in stepwise an accumulator back pressure of at least one of the friction engagement element of an engagement side and the friction engagement element of a release side when said racing is detected by said racing detection unit, and said accumulator back pressure control unit comprises: a rotation speed detection unit for detecting an engine rotation speed; and a correction amount setting unit for setting an increase correction amount of the accumulator back pressure in accordance with said engine rotation speed.