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. 19, 2002
Filed:
Jun. 19, 2001
Neil E Robb, Jackson, MI (US);
Borg Warner, Inc., Troy, MI (US);
Abstract
An electronically-controlled viscous coupling is coupled to a water pump to control the coolant flow rate of engine coolant to an engine to maximize fuel economy and minimize emissions while preventing pump cavitation and possible water pump damage. The viscous coupling controls the rotational speed of a water pump shaft that is used for moving engine coolant through a cooling system as a function of engine speed and engine temperature. The viscous coupling has a stationary electrical coil that, when excited by electrical current, closes valve members which prevent the viscous fluid from entering the working chamber, thereby preventing the creation of torque to drive the water pump shaft.