The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 12, 2002
Filed:
Jan. 29, 2002
Katsutoshi Sato, Toyoake, JP;
Yasuo Shirai, Chiryu, JP;
Akira Aikawa, Aichi-ken, JP;
Hiroaki Kato, Kuwana, JP;
Atsumi Ohara, Ibaraki, JP;
Aisin Seiki Kabushiki Kaisha, Kariya, JP;
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 (s) which shows a behavior such that the controller C (s) and a controlled object P(s) are collaborated to correspond to the reference model. The controller C (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.