Control system for an automatic transmission in an automotive vehicle

A control system for an automatic transmission in an automotive vehicle, which selects an appropriate shift pattern in compliance with a temperature of hydraulic oil contained in a torque converter of the automatic transmission, said control system comprising:

• a transmission control unit having a plurality of shift patterns including a first shift pattern favored for a cold engine and a second shift pattern favored for an engine after warm-up;
• oil temperature detector means for detecting the temperature of hydraulic oil contained in or supplied to the torque converter;
• timer means for counting a time period after engine starting;
• and
• shift pattern selector means for selecting said first shift pattern when the temperature of hydraulic oil is less than a preset value, said shift pattern selector means selecting said second shift pattern when the time set by said timer means is up or when the temperature of hydraulic oil exceeds said preset value.