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. 06, 2004
Filed:
Jul. 09, 2001
Hideo Konishi, Tokyo, JP;
Kenji Arai, Tokyo, JP;
Seiichi Akiyama, Tokyo, JP;
Masumi Nomura, Tokyo, JP;
Shin Caterpillar Mitsubishi Ltd., Tokyo, JP;
Abstract
Disclosed herein is a hydraulic-pump controller that is capable of controlling absorbed pump torque in good balance against engine output at all times. In this hydraulic-pump controller, the discharge flow rates of the operating oil that are discharged from hydraulic pumps ( ) according to manipulation of manipulation units ( ) are predicted based on the discharge pressure of the hydraulic pumps ( ) that are driven by an engine ( ), and based on the manipulation amount of the manipulation units ( ) that manipulate hydraulic actuators ( ), or a physical quantity correlating with the manipulation amount. Based on the predicted discharge flow rates and the discharge pressure, the absorbed torque of the hydraulic pumps is computed. Then, the predictive engine speed of the engine ( ) is computed from the absorbed torque of the hydraulic pumps ( ) computed. Based on the deviation between the computed predictive engine speed and the actual engine speed of the engine ( ), the regulators ( ) of the hydraulic pumps ( ) are controlled.