Patent ID: 6503169
Filing Date: 2003-01-07
Classification: F16H,Y10T

Abstract:
An apparatus for controlling a power transmission device having:a speed changer for changing power inputted from a prime mover and outputting the same; a torque converter, which is provided between an output shaft of said prime mover and an input shaft of said speed changer, for transmitting power therebetween; and a lockup mechanism, which engages the output shaft of said prime mover with the input shaft of said speed changer, for transmitting power therebetween; wherein said apparatus comprises a lockup changing means that causes said lockup mechanism to change the position thereof between a first position where the lockup mechanism supplies and discharges a working oil so as to carry out a connection and a second position where the lockup mechanism supplies and discharges said working oil so as to carry out a disconnection; a working oil pressure changeover setting means that is capable of changing the pressure setting state thereof to a first state where the pressure of working oil used to operate said speed changer is set to a first pressure and to a second state where the pressure of working oil used to operate said speed changer is set to a second pressure, which is higher than said first pressure; and a signal pressure outputting means for selectively outputting any one of a first signal pressure by which said lockup changing means is positioned at said first position and said working oil pressure changing means is made into said first state and a second signal pressure by which said lockup changing means is positioned at said second position and said working oil pressure changing means is made into said second state.