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:
Jan. 02, 2001
Filed:
Jul. 22, 1999
Takashi Sakasai, Showa-machi, JP;
Komatsu Ltd., Tokyo, JP;
Abstract
The present invention is a control device and a control method for a cam driving type electronic control unit injector, in which driving force transmitting parts do not separate from a cam even when a high injection pressure is used. For this purpose, the control device includes a feed and pressure passage (,) for providing communication between an oil reservoir (,) and a plunger chamber (,), a valve (,) for opening and closing the feed and pressure passage (,), a first solenoid (,) for moving the valve (,) during an injection stroke to close the feed and pressure passage (,) to raise a pressure in the plunger chamber (,), a spring (,) for pressing the valve (,) to open the feed and pressure passage (,), and a control means (,) for supplying a smaller current than that when the valve (,) is moving during the aforesaid injection stroke, through the first solenoid (,) for a predetermined period (AV,) after the lapse of a predetermined period of time (T,) immediately after completion of main injection to move the valve (,) in a closing direction of the feed and pressure passage (,) to thereby output a command for raising the pressure in the plunger chamber (,).