Patent Number: 6,480,777

Title: Hydraulic pressure control device for automatic transmission

Abstract: A hydraulic pressure control device for an automatic transmission is adapted to smoothly change the slip amount of the automatic transmission when a clutch to clutch shift control is performed. The hydraulic pressure control device uses a reference model showing a behavior with an output corresponding to a predetermined slip amount which smoothly varies over time with respect to a target slip amount which varies in a stepped manner. The hydraulic pressure is applied to a release side frictional engagement element using a controller C.sub.EMM (s) which shows a behavior such that the controller C.sub.EMM (s) and a controlled object P(s) are collaborated to correspond to the reference model. The controller C.sub.EMM (s) and the controlled object P(s) have the hydraulic pressure applied to the release side frictional engagement element of the automatic transmission as an input and the slip amount of the automatic transmission as an output.

Inventors: Sato; Katsutoshi (Toyoake, JP), Shirai; Yasuo (Chiryu, JP), Aikawa; Akira (Aichi-ken, JP), Kato; Hiroaki (Kuwana, JP), Ohara; Atsumi (Ibaraki, JP)

Assignee: Aisin Seiki Kabushiki Kaisha

International Classification: F16H 61/06 (20060101); B60K 041/08 ()

Expiration Date: 11/12/2019