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:
Feb. 26, 2002
Filed:
Apr. 20, 2000
Ikuo Kita, Hirakata, JP;
Toshikazu Okada, Osaka, JP;
Atsushi Uemura, Hirakata, JP;
Shigeru Yamamoto, Hirakata, JP;
Tomohiro Nakagawa, Hirakata, JP;
Komatsu Ltd., Tokyo, JP;
Abstract
A controlling device for a hydraulically operated cooling fan capable of obtaining optimum cooling efficiency by continuously controlling a rotational frequency of the cooling fan according to a cooling water temperature, a hydraulic oil temperature, and an engine speed is provided. To this end, the controlling device includes a hydraulic motor ( ) for driving a cooling fan ( ), a variable displacement hydraulic pump ( ) capable of controlling the rotational frequency of the hydraulic motor ( ), a cooling water temperature sensor ( ) for detecting a cooling water temperature (TW), a hydraulic oil temperature sensor (22) for detecting a hydraulic oil temperature (To), an engine speed sensor ( ) for detecting an engine speed (E), and a controller ( ) which inputs detected signals from these sensors ( ), computes and outputs a discharge capacity command value of the variable displacement hydraulic pump ( ) according to the inputted cooling water temperature (Tw), hydraulic oil temperature (To), and engine speed (E), and continuously controls a rotational frequency (N) of the cooling fan ( ) by means of the variable displacement hydraulic pump ( ).