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. 20, 2024
Filed:
Feb. 18, 2022
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Jun Okamura, Kasumigaura, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
An object of the invention of the present application is to provide a hydraulic system that is capable of causing a control pressure outputted from a solenoid valve to follow a control request value quickly at the time the solenoid valve starts to be driven. To achieve the object, in the hydraulic system including a solenoid valve that generates a control pressure for operating a control valve, an operation device that is operated to input a control request value as a request value for the control pressure, and a controller configured to set a control target value as a target value for the control pressure depending on the control request value and drive the solenoid valve with the control target value, the controller sets the control target value such that the control target value becomes a maximum output pressure in a usage range of the solenoid valve at the time of starting to drive the solenoid valve and becomes gradually closer to the control request value as time elapses after having reached the maximum output pressure.