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:
Apr. 23, 2002
Filed:
Oct. 18, 2000
Tatsuo Wakahara, Kawasaki, JP;
Kenichiro Murakami, Atsugi, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
A valve ( ) causes fluid pressures to act individually on plural frictional elements (A, B) of an automatic transmission so as to selectively lock the rotation of the frictional elements (A, B). A control unit ( ) determines that the automatic transmission has an interlock tendency when the fluid pressures acting on the frictional elements (A, B) detected by pressure sensors ( ) are both equal to or greater than a predetermined pressure. Completion of a gear position change-over is detected by a sensor ( ), and the control unit ( ) does not determine the interlock tendency until a predetermined time &Dgr;t has elapsed after the gear position change-over is complete. In this way, an incorrect determination is prevented by avoiding the determination in a period when the pressures are unstable in a period immediately after the gear position change-over of the automatic transmission.