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:
Nov. 20, 2012
Filed:
Oct. 24, 2008
Koji Hyodo, Kasumigaura, JP;
Hiroki Nakazono, Ryugasaki, JP;
Nobuhiro Suzuki, Ryugasaki, JP;
Atsushi Shimazu, Toride, JP;
Masaki Yoshikawa, Kasama, JP;
Kentaro Itoga, Tsukuba, JP;
Kazuo Chonan, Moriya, JP;
Tomoo Takahashi, Kasumigaura, JP;
Koji Hyodo, Kasumigaura, JP;
Hiroki Nakazono, Ryugasaki, JP;
Nobuhiro Suzuki, Ryugasaki, JP;
Atsushi Shimazu, Toride, JP;
Masaki Yoshikawa, Kasama, JP;
Kentaro Itoga, Tsukuba, JP;
Kazuo Chonan, Moriya, JP;
Tomoo Takahashi, Kasumigaura, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
There are provided: a pedal operation amount detection unitthat detects an operation amount s of the accelerator pedal; a speed ratio detection unitthat detects a speed ratio e of an input shaft and an output shaft of the torque converter; a load pressure detection unitthat detects a load pressure P of the hydraulic pump; a speed stage detection unitthat detects a low speed stage of a transmissioncapable of varying a speed stage between a low speed stage and a high speed stage; and a speed limiting unitthat limits a maximum speed of the engineto a lower speed upon satisfaction of following speed limitation conditions: at least a pedal operation amount s is equal to or greater than a predetermined value s, a speed ratio e is equal to or less than a predetermined value ea, a load pressure P is equal to or greater than a predetermined value Pa, and the low speed stage of the transmission has been detected.