Patent Number: 6,168,547

Title: Line pressure control device for automatic transmission

Abstract: A controller (61) for a line pressure control device of a transmission (200) compares a CVT pressure P.sub.CVT and a clutch pressure P.sub.LUB when the rotation speed of an engine (100) is low and sets the higher of the two as a target line pressure P.sub.L. When the rotation speed of an engine (100) is high, the CVT pressure P.sub.CVT, the clutch pressure P.sub.LUB and a lubrication pressure P.sub.LUB are compared, and the highest of the three is set as the target line pressure P.sub.L. Thus it is possible to reduce pump noise as well as satisfy oil pressure requirements in the transmission (200) by switching the method of setting a line pressure in response to the rotation speed of the engine (100).

Inventors: Kawamura; Yasutaka (Kanagawa, JP)

Assignee: Nissan Motor Co., Ltd.

International Classification: F16H 57/04 (20060101); F16H 61/662 (20060101); F16H 61/66 (20060101); F16H 61/00 (20060101); F16H 061/06 ()

Expiration Date: 01/02/2018