CONTROLLER OF VEHICLE AUTOMATIC TRANSMISSION

摘要

A controller capable of ensuring an engine braking force or a drive torque even if the speed-change ratio control of an automatic transmission or the speed-down control thereof fails. A controller of a vehicle automatic transmission which outputs a power produced by varying the input power with the speed change ratio comprises failure detecting means for detecting a failure that one of predetermined speed-change rations cannot be set and speed-decrease command means for outputting a speed-change command to set a speed-change ratio higher than the predetermined speed-change ratio according to the signal outputted when the failure detecting means detects a failure.