Patent ID: 8010268
Filing Date: 2011-08-30
Classification: F16H,Y10T

Abstract:
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 detecting portion detecting a state of said limiting member; 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 predetermined condition as to the state of said limiting member is satisfied, wherein said outer race is fixed to a housing of said automatic transmission, said inner race is coupled to a rotation shaft of said automatic transmission, said suppressing portion is a frictional engagement element that is provided between said housing and said rotation shaft so as to couple to said limiting member via said housing and said rotation shaft, and that operates by a hydraulic pressure, said control portion controls said frictional engagement element so that said frictional engagement element enters an engaged state, and said predetermined condition is the limiting member turning freely and is based on a difference between a detected rotation speed of an output shaft of said automatic transmission and an estimated rotation speed of said output shaft of said automatic transmission.