TRANSMISSION GEAR RATIO CONTROL DEVICE AND TRANSMISSION GEAR RATIO CONTROL METHOD

摘要

The transmission control device of automatic vehicle transmissions calculates a minimum engine rotation speed on the basis of the road load and sets the target transmission gear ratio so that the engine rotation speed does not fall below the minimum engine rotation speed. By using a higher value for the minimum engine rotation speed when the vehicle road load is at or above a specified value compared to when the road load is not, re-acceleration performance for large road loads such as traveling uphill while towing another vehicle is achieved.