Gear-ratio control equipment for automatic transmission on motor vehicle

摘要

The equipment compares the actual acceleration of the vehicle on a slope with a reference value. The shortfall in power from the engine (10) is determined (106) with respect to the position of the accelerator pedal. The reference value of acceleration is reduced (108) by an amount which decreases with an increase in road speed (62) after the determination of power shortfall. A descent is recognised (102) from a comparison of the acceleration with a standard value corresponding to a level road, and an appropriate ratio of the transmission (14) is engaged (100).