Method and Apparatus for Controlling Degradation of Mating Failure Mode

摘要

And a control device / method for an automatic transmission including a splitter-type drift block mechanical transmission (12). The control device and method are techniques for detecting sub-section and main section engagement failures, and for allowing a fixed allowable mode when such failures are detected. In the embodiment, the sub-section * 214 meshing failure indicates that the main section 212 is engaged at an appropriate ratio, and the transmission is in the target gear ratio GR_T) (GR_N) Is detected. In another embodiment, the engaged failure is detected when one section is identified as properly engaged and the transmission fails to achieve meshing of the target gear ratio after a pre-set period.