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:
Jul. 10, 2001
Filed:
Jul. 21, 1998
Hiroshi Tsutsui, Anjo, JP;
Masaaki Nishida, Anjo, JP;
Yoshihisa Yamamoto, Anjo, JP;
Masao Saito, Anjo, JP;
Takayuki Kubo, Anjo, JP;
Aisin AW Co., Ltd., , JP;
Abstract
A learning controller makes learning correction based on a time t,between start of a shift control routine and detection of start of a change in rotational speed of the transmission input shaft and further based on the amount of rotational speed change &ohgr;,′ at the detected start of the rotational speed change. When the time t,is longer than a basic time and when the rotational change amount &ohgr;,′ is too large, it is determined that a servo piston has not been sufficiently advanced and the shift control is corrected so that the time t,is lengthened. When the time t,to the detected start of the rotational speed change &ohgr;,′ is too small, it is determined that, while the piston has been advanced properly, the target engagement pressure P,in torque phase control is too low because of a miscalculation, and the shift control is corrected so that the target engagement pressure is raised.