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. 29, 2013
Filed:
Mar. 12, 2008
Koji Hyodo, Kasumigaura, JP;
Nobuyuki Hidaka, Kasumigaura, JP;
Masaki Yoshikawa, Kasama, JP;
Tsuyoshi Takeyama, Ryugasaki, JP;
Kazuo Chonan, Moriya, JP;
Yasuo Yamazaki, Ryugasaki, JP;
Koji Hyodo, Kasumigaura, JP;
Nobuyuki Hidaka, Kasumigaura, JP;
Masaki Yoshikawa, Kasama, JP;
Tsuyoshi Takeyama, Ryugasaki, JP;
Kazuo Chonan, Moriya, JP;
Yasuo Yamazaki, Ryugasaki, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
A control apparatus for a working vehicle includes a travel circuit HCformed through a closed circuit connection of a variable displacement hydraulic pump driven by an engine and a variable displacement hydraulic motor, a work circuit HCthat includes a work hydraulic pump driven by the engine and a work hydraulic actuator that operates by pressure oil from the work hydraulic pump, a relief valve that relieves high pressure oil of the travel circuit HC, a rotation speed control unit that controls the engine rotation speed in correspondence to an accelerator pedal operation amount, a state detection unit that detects a vehicle state of high load travel and high load work, and a speed limitation unit that reduces an engine rotation speed upper limit when the vehicle state of high load travel and high load work is detected.