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:
Aug. 12, 2008
Filed:
Oct. 27, 2006
Keiji Hisahara, Kanagawa, JP;
Toshiro Ichikawa, Kanagawa, JP;
Seiji Suga, Kanagawa, JP;
Osamu Fujita, Kanagawa, JP;
Takanori Sawada, Kanagawa, JP;
Keiji Hisahara, Kanagawa, JP;
Toshiro Ichikawa, Kanagawa, JP;
Seiji Suga, Kanagawa, JP;
Osamu Fujita, Kanagawa, JP;
Takanori Sawada, Kanagawa, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A hydraulic control system for an internal combustion engine, includes a driven mechanism driven by hydraulic pressure fed through a flowing passage change-over valve. The flowing passage change-over valve includes a valve body formed with a plurality of ports which are respectively communicated with the supply passage and the oil passage, and a spool valve body slidably disposed in the valve body to open and close the plurality of ports, the ports including a supplying port communicated with the supplying passage. The maximum cross-sectional area of the supplying port is larger than a minimum cross-sectional area of the supplying passage. The flowing passage change-over valve is supplied with electric current to heat hydraulic fluid kept in the flowing passage change-over valve so as to lower a viscosity of the hydraulic fluid.