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:
Sep. 14, 2021
Filed:
May. 20, 2019
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Juri Shimizu, Tokyo, JP;
Kenji Hiraku, Tsuchiura, JP;
Hiromasa Takahashi, Tsuchiura, JP;
Teppei Saitou, Tsuchiura, JP;
Shouhei Sugiki, Tsuchiura, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
An object of the present invention is to provide a construction machine capable of suppressing lugging down of an engine irrespective of contents of operation of an operator and the load state of a hydraulic actuator. A controllerincludes: a demanded torque estimating sectionconfigured to estimate demanded torque as torque demanded from an engineby the first hydraulic pump on the basis of a demanded velocity of a first hydraulic actuatorand a load pressure on the first hydraulic actuator; a demanded velocity limiting sectionconfigured to, in a case in which a demanded torque change rate as a change rate of the demanded torque exceeds a predetermined change rate, limit the demanded velocity such that the demanded torque change rate becomes equal to or lower than the predetermined change rate; and a command calculating sectionconfigured to calculate a delivery flow rate of the first hydraulic pump on the basis of the demanded velocity of the first hydraulic actuator, the demanded velocity being limited by the demanded velocity limiting section.