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. 14, 2007
Filed:
Jun. 24, 2004
Kazunori Nakamura, Tsuchiura, JP;
Yasushi Arai, Tsuchiura, JP;
Yoichi Kowatari, Ibaraki-ken, JP;
Kouji Ishikawa, Ibaraki-ken, JP;
Hideo Karasawa, Tsuchiura, JP;
Kazunori Nakamura, Tsuchiura, JP;
Yasushi Arai, Tsuchiura, JP;
Yoichi Kowatari, Ibaraki-ken, JP;
Kouji Ishikawa, Ibaraki-ken, JP;
Hideo Karasawa, Tsuchiura, JP;
Hitachi Construction Machinery Co. Ltd., Tokyo, JP;
Abstract
An engine control system includes pressure sensors (), position sensors (), pressure sensors (), a target revolution speed modification value computing unit (), and a modification value adder (). A target revolution speed NRfor use in control is computed based on changes of status variables such that the target revolution speed NRincreases from the target revolution speed NRapplied from an input unit (), and then moderately returns to the target revolution speed NR. In accordance with the computed target revolution speed NRfor use in control, a target fuel injection amount FNis computed and a fuel injection amount is controlled. As a result, a drop of an engine revolution speed attributable to an abrupt increase of an engine load can be suppressed without sacrificing the work efficiency, and lowering of durability caused by an excessive increase of the engine revolution speed can be prevented.