Patent Number: 6,169,949

Title: Control apparatus of automatic transmission for vehicle and control method of automatic transmission for vehicle

Abstract: In a vehicle having a continuously variable transmission, a road surface gradient estimation block for calculating a road surface gradient and a target vehicle speed value decision block for deciding a vehicle speed according to the road surface gradient are provided. During a vehicle running, when the road surface gradient becomes larger than a stored judgment value, a target vehicle speed is prepared in accordance with a vehicle speed at a time a road gradient value exceeds over an establishment value, a transmission ratio is controlled to have the target speed. Accordingly, a drive force in response to the road surface gradient can be carried out without a change-over of a transmission mode by a driver himself.

Inventors: Sato; Kazuhiko (Hitachioota, JP)

Assignee: Hitachi, Ltd.

International Classification: B60K 31/02 (20060101); B60K 31/04 (20060101); F16H 61/02 (20060101); F16H 59/14 (20060101); F16H 59/60 (20060101); F16H 59/66 (20060101); G06F 017/00 ()

Expiration Date: 01/02/2018