Patent ID: 6793602
Filing Date: 2004-09-21
Classification: F16H,Y10T

Abstract:
An automatic transmission control device comprising:an automatic transmission including a plurality of engine brake friction elements operating engine brakes during engagement, and provided with a first gear stage connected to a first shift valve in which a first engine brake friction element among the plurality of engine brake friction elements is engaged and established, and a second gear stage connected to the first shift valve in which a second engine brake friction element among the plurality of engine brake friction elements is engaged and established; a linear solenoid valve connected to the first shift valve; a detecting portion that detects a shift demand towards the first gear stage and the second gear stage; and a control portion engaging and releasing the first engine brake friction element and the second engine brake friction element through the linear solenoid valve, and including a valve control portion that controls the solenoid valve such that a time reduction rate of an output oil pressure from the linear solenoid valve to the shift valve becomes equal to or less than a predetermined rate in response to the detection of a shift demand for a shift from the second gear stage to the first gear stage during shifting from the first gear stage to the second gear stage and a command portion that commands the automatic transmission with a shift command from the second gear stage to the first gear stage in response to a passage of a predetermined time since the detection of a shift demand for a shift from the second gear stage to the first gear stage.