Apparatus for controlling vehicle drive system including drive power source and automatic transmission

摘要

Apparatus for controlling a vehicle drive system including a drive power source, a fluid-operated power transmitting device connected to the drive power source, and an automatic transmission for transmitting a rotary motion of the fluid-operated power transmitting device to vehicle drive wheels such that a speed ratio of the automatic transmission is variable, the apparatus being arranged to increase an output of the drive power source for increasing its speed upon a shift-down action of the automatic transmission so as to increase its speed ratio during a coasting run of the vehicle, and including an output controlling element operable to control the output of the drive power source, and a gradually output increasing device operable upon the shift-down action during the coasting run, for controlling the output controlling element so as to gradually increase the speed of the drive power source at a predetermined rate.