Control apparatus for automatic transmission

Abstract

An ECU executes a program including causing a brake to enter an engaged state, when first gear is implemented and when a difference between an output shaft rotation speed estimated from an input shaft rotation speed and a detected output shaft rotation speed is greater than a threshold value. When the brake enters the engaged state, the relative rotation between the inner race and the outer race of a one-way clutch is limited.

1 : A control apparatus for an automatic transmission transmitting a driving force to a wheel by a limiting member that permits rotation of an outer race and an inner race relative to each other in one direction and that limits rotation of said outer race and said inner race relative to each other in the other direction, comprising:
 a suppressing portion coupled to said outer race and said inner race and suppressing a difference in rotation speed between said outer race and said inner race;   a rotation speed detecting portion detecting a rotation speed of an output shaft of said automatic transmission; and   a control portion controlling said suppressing portion to suppress the difference in the rotation speed between said outer race and said inner race when a condition that a change rate of the rotation speed of said output shaft is greater than a predetermined change rate is satisfied.   
     
     
         2 . A control apparatus for an automatic transmission transmitting a driving force to a wheel by a limiting member that permits rotation of an outer race and an inner race relative to each other in one direction and that limits rotation of said outer race and said inner race relative to each other in the other direction, comprising:
 suppressing means coupled to said outer race and said inner race for suppressing a difference in rotation speed between said outer race and said inner race;   means for detecting a rotation speed of an output shaft of said automatic transmission; and   control means for controlling said suppressing means to suppress the difference in the rotation speed between said outer race and said inner race when a condition that a change rate of the rotation speed of said output shaft is greater than a predetermined change rate is satisfied.   
     
     
         3 . A control apparatus for an automatic transmission transmitting a driving force to a wheel by a one-way clutch that permits rotation of an outer race and an inner race relative to each other in one direction and that limits rotation of said outer race and said inner race relative to each other in the other direction, comprising:
 a brake coupled to said outer race and said inner race and suppressing a difference in rotation speed between said outer race and said inner race; and   an ECU detecting a rotation speed of an output shaft of said automatic transmission and controlling said brake to suppress the difference in the rotation speed between said outer race and said inner race when a condition that a change rate of the rotation speed of said output shaft is greater than a predetermined change rate is satisfied.