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:
May. 26, 1992
Filed:
Jul. 11, 1991
Hiroshi Sasaki, Yokohama, JP;
Shinsuke Nakazawa, Yokohama, JP;
Yuji Kato, Tokyo, JP;
Tatsuo Wakahara, Kawasaki, JP;
Shigeki Shimanaka, Hadano, JP;
Hiroshi Asano, Zama, JP;
Hiroshi Yamaguchi, Yokohama, JP;
Kazuhiro Ishigami, Sagamihara, JP;
Shinichi Takenouchi, Yokosuka, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
A hydraulic pressure, i.e., a line pressure, of a hydraulic fluid supplied from an engine driven pump toward a hydraulically actuable coupling of an automatic transmission is held at the maximum pressure value when a temperature of an automatic transmission oil is less than a predetermined temperature value. However, the hydraulic pressure is temporarily decreased from the maximum pressure value to the minimum pressure value for a period of time after cranking of the engine when the transmission oil temperature is lower than the predetermined temperature value. Owing to a decreased load on the engine by the oil pump, smooth cranking and subsequent warming-up operation of the engine is assured under cold whether condition when the automatic transmission oil temperature is lower than the predetermined temperature value.