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:
Oct. 27, 2009
Filed:
Dec. 08, 2004
Koji Ohigashi, Hirakata, JP;
Takashi Kawakami, Hirakata, JP;
Kenzo Kimoto, Hirakata, JP;
Komatsu Ltd., Tokyo, JP;
Abstract
In construction machinery, control is conducted to keep a work machine to operate at a constant speed regardless of the operation thereof. Different engine output lines T-Tand pump torque lines M-Mare defined for different operation types. All the matching points of the engine output lines T-Tand pump torque lines M-Mdesignate a constant engine speed N. One engine output line and one pump torque line are selected according to the operation type presently selected. An output horsepower of the engine is controlled on an equal horsepower line corresponding to a sum of a horsepower for an auxiliary machine and a horsepower at a matching point of the selected lines. The pump torque for the work machine is controlled on the selected pump torque line. The engine operates at a constant speed Neven when the operation type varies or the horsepower for the auxiliary machine changes.