CONTROL DEVICE OF AUTOMATIC TRANSMISSION UPON THE MALFUNCTION OF THE AUTOMATIC TRANSMISSION

摘要

An apparatus for controlling fault of automatic transmission is provided to determine what a friction element is undergoing fault-induced disengagement when occurrence of the fault-induced disengagement of the friction element to be engaged at a current gear stage is detected. A fault detecting unit detects occurrence of fault-induced engagement in any of friction elements to be engaged at a current gear stage. A determining unit determines the friction element occurring the fault-induced engagement. A command output unit outputs a command to establish another gear stage different from the gear stage at the time of occurrence of the fault-induced disengagement. The command output unit simultaneously outputs plural commands to establish plural gear stages corresponding to combination of engagement of the friction elements to be engaged at the gear stage at the time of occurrence of the fault-induced disengagement. At the time of occurrence of the fault-induced disengagement, the gear stage is established by combination of engagements of the friction elements which independently constitute an essential friction element to be engaged for establishing any of gear stages other than the predetermined gear stage.