| 摘要 |
A slip condition of a torque converter is learned at a predetermined operating condition with a lock-up mechanism disengaged, and a diagnosis condition (for example a start time or judgement level of the fault diagnosis) used in diagnosing a fault in the lock-up mechanism on the basis of slip conditions of the torque converter which change after issue of a disengage command to the lock-up mechanism, is corrected in accordance with the learned result. As a result, the diagnosis condition which is conventionally set assuming a maximum viscosity for the operating fluid, can be changed to correspond to the actual viscosity of the operating fluid being used. Hence, the time delay from issue of a disengage command to the lock-up mechanism until starting fault diagnosis can be reduced, so that it is possible to diagnose if normal lock-up mechanism disengagement is being made at a response speed which follows the demands for rapid lock-up mechanism disengagement under operating conditions including acceleration and deceleration operating conditions such as encountered with city driving and the like. |
