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:
Aug. 07, 2018
Filed:
Mar. 02, 2017
Applicant:
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Inventors:
Assignee:
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F 7/70 (2006.01); G06F 19/00 (2018.01); G06G 7/00 (2006.01); G06G 7/76 (2006.01); E02F 3/43 (2006.01); E02F 9/20 (2006.01); E02F 3/32 (2006.01); E02F 9/22 (2006.01); E02F 9/26 (2006.01); E02F 3/42 (2006.01); G01M 1/38 (2006.01); G05B 13/00 (2006.01); G05B 15/00 (2006.01); G05D 23/00 (2006.01); E02F 3/96 (2006.01);
U.S. Cl.
CPC ...
E02F 3/435 (2013.01); E02F 3/32 (2013.01); E02F 3/425 (2013.01); E02F 9/2004 (2013.01); E02F 9/2203 (2013.01); E02F 9/2228 (2013.01); E02F 9/2285 (2013.01); E02F 9/268 (2013.01); E02F 3/964 (2013.01);
Abstract
A drive control system for a work machine. A gradual stoppage command and an operation speed limitation command are calculated and output. A pilot pressure is corrected such that, upon a stoppage operation of a control lever, a drive actuator is stopped gradually; and the pilot pressure is corrected such that an operation speed of the drive actuator is limited. A supply of the pilot hydraulic fluid to the speed increasing unit is interrupted when a failure of a speed increasing solenoid proportional valve of the speed increasing unit is detected.