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:
May. 04, 2010
Filed:
Feb. 06, 2007
Michael A. Turley, Dexter, MI (US);
James A. Lasecki, Farmington Hills, MI (US);
Timothy P. Worthley, Oakland Township, MI (US);
Michael J. Melaragni, Rochester, MI (US);
Jeffrey A. Bozeman, Rochester, MI (US);
Michael A. Turley, Dexter, MI (US);
James A. Lasecki, Farmington Hills, MI (US);
Timothy P. Worthley, Oakland Township, MI (US);
Michael J. Melaragni, Rochester, MI (US);
Jeffrey A. Bozeman, Rochester, MI (US);
GM Global Technology Operations, Inc., Detroit, MI (US);
Abstract
Accordingly, a control system for controlling a viscous clutch of a fan is provided. The control system includes a delta speed module that determines one of an over speed condition, an under speed condition, and a steady state condition based on a desired fan speed and an actual fan speed. A mode module determines a mode of the clutch based on the one of the over-speed condition, the under-speed condition, and the steady state condition, wherein the mode is one of a pump in mode, a pump out mode, and a closed loop mode. A valve control module that controls an operational state of the clutch valve based on the mode.