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:
Dec. 29, 2009
Filed:
Oct. 14, 2003
Eiji Toda, Hatoyama-Cho, JP;
Yoshiharu Sato, Mooka, JP;
Eiji Toda, Hatoyama-Cho, JP;
Yoshiharu Sato, Mooka, JP;
Komatsu Ltd., Tokyo, JP;
Abstract
A hydraulic pump displacement control apparatus for a working vehicle capable of reliably detecting the working vehicle under excavating operation and reducing loss in power is provided. For this purpose, the control apparatus includes a bottom pressure detector () for detecting a hydraulic pressure in a bottom side (A) of a cylinder () for operating a working machine (), a displacement control device () for controlling a displacement of a variable displacement hydraulic pump (), and a controller () which determines that an excavating operation starts when a predetermined time elapses with a detection value from the bottom pressure detector at a predetermined value or less and thereafter, the detection value exceeds the predetermined value, and outputs a displacement control signal to reduce the displacement of the hydraulic pump to a predetermined displacement that is smaller than the maximum displacement to the displacement control device.