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, 2018
Filed:
Nov. 17, 2014
Hitachi Construction Machinery Co., Ltd., Bunkyo-ku, Tokyo, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
The purpose of the present invention is to provide a cooling fan control device for a construction machine, whereby the effects of heat caused by warm-up operation can be suppressed. This cooling fan control device is equipped with a control unit () that controls the rotational speed of a cooling fan () in accordance with a main pump discharge pressure (P) detected by a main pump discharge pressure sensor (), an engine cooling water temperature (Tw) detected by an engine cooling water temperature sensor (), a hydraulic oil temperature (To) detected by a hydraulic oil temperature sensor (), and an engine rotational speed (E) detected by an engine rotational speed sensor (). The cooling fan () is rotated at the rotational speed controlled by the control unit (), thereby sending the generated cooling air to an oil cooler () and a control valve ().