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:
Jul. 27, 2010
Filed:
Jun. 06, 2008
Freeman Carter Gates, Bloomfield Hills, MI (US);
Sassan Farahmand, Canton, MI (US);
Freeman Carter Gates, Bloomfield Hills, MI (US);
Sassan Farahmand, Canton, MI (US);
Ford Global Technologies, LLC, Dearborn, MI (US);
Abstract
A system and method for controlling a multiple cylinder internal combustion engine include a mechanically operated exhaust gas recirculation valve having a spring-biased pintle with a surface area sized to generate a spring-opposing force to open a valve chamber entrance when an exhaust pressure differential exceeds a first threshold to allow exhaust gas to flow toward an intake and to close a valve chamber exit spaced from the chamber entrance to block exhaust gas flowing to the intake when the pressure differential exceeds a second threshold. The valve operates to limit or block external EGR flow at low load such as during starting and idle as well as at wide-open throttle while metering EGR flow for mid-to-high loads.