Steuereinrichtung für ein automatisches Fahrzeuggetriebe

摘要

A system for controlling an automatic transmission (12) mounted on a vehicle, including an automatic mode in which gear is retrieved from a predetermined gearshift characteristics by the detected vehicle speed (VSP) and the engine load (THHF) and an manual mode in which gear is designated by a device manually operated by a vehicle driver. In the system, a temperature (TEX) in an exhaust pipe (38) of the vehicle is estimated based on the detecting operating conditions and the gear designated in the manual mode is corrected to upshift by one gear, if the estimated exhaust pipe temperature (TEX) is found to exceed a predetermined temperature, thereby improving avoidance of the occurrence of excessive thermal load of components in the vicinity of the exhaust pipe (38), and that, by not conducting forced upshift until such time, fully exploits the features of the manual mode and, by this, makes the product more appealing to customers.