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:
Apr. 21, 2020
Filed:
Feb. 23, 2016
Hitachi Construction Machinery Co., Ltd., Taito-ku, Tokyo, JP;
Hiroyuki Kobayashi, Tokyo, JP;
Hiroshi Sakamoto, Tsuchiura, JP;
Yoshiyuki Tsuchie, Tokyo, JP;
Hidekazu Moriki, Tokyo, JP;
Yasutaka Tsuruga, Tsuchiura, JP;
HITACHI CONSTRUCTION MACHINERY CO., LTD., Tokyo, JP;
Abstract
A control system for a construction machine includes an electric lever operating device that outputs a command to a hydraulic actuator, a travel control lever device that outputs a command to a travel device, and a controller that outputs a drive command to a solenoid proportional valve that decompresses hydraulic fluid supplied from a pilot hydraulic source. The control system includes a machine body state judgment part that judges the state of the machine body based on an electric signal from the electric lever operating device and an operation amount of the travel control lever device and a dead zone calculation part that calculates a dead zone for the electric signal from the electric lever operating device based on the state of the machine body. The dead zone calculation part sets the dead zone for the electric signal at a first predetermined value when the machine body is in the travel-solo state and sets the dead zone for the electric signal at a second predetermined value smaller than the first predetermined value when the machine body is in the traveling work state.