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. 20, 2001
Filed:
Aug. 23, 1999
Roman Joseph Press, Pittsford, NY (US);
Kenneth John Dauer, Avon, NY (US);
Delphi Technologies, Inc., Troy, MI (US);
Abstract
A simplified EGR valve for automotive engines is actuated by compact single or dual solenoids having a short stroke. The short stroke is made possible by one or more annular orifices in a preferably flat valve seat or valve plate, the orifices being fed from both radially inner and outer sides upon opening movement of the valve plate a short distance away from the valve seat. The use of annular orifices allows a relatively large gas flow through the valve with a short stroke or movement of the valve plate. This permits the use of a solenoid or solenoids of relatively low power and mass. The valve may be operated by pulse width modulation of an electrical signal controlled by the vehicle ECM to vary the percentage of open time of the valve in order to vary EGR flow in a known manner. Thus, the need for a valve position sensor and feedback control is avoided which, together with reduced actuator mass and volume, provides a substantially reduced cost and operating complexity for the system. The valve assembly, including a valve plate, a pintle shaft and an attached solenoid armature, may be made very light so that response time to opening and closing commands is rapid and the use of relatively low power solenoid actuation is enhanced.