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:
Jan. 14, 1986
Filed:
Mar. 08, 1984
Applicant:
Inventors:
Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F02M / ;
U.S. Cl.
CPC ...
123568 ;
Abstract
A control arrangement for an internal combustion engine equipped with vacuum-operated control devices includes a method and apparatus for applying a vacuum to a control device, retaining the vacuum for a specified time or under specified engine operating conditions and then reducing the vacuum in a controlled manner. A particular arrangement used to control an exhaust gas return system includes a no-return valve, connected in the vacuum line leading to an exhaust gas return valve, and a by-pass valve for by-passing the non-return valve under specified conditions. Exhaust gas return is maintained over a range of engine operating conditions, incurring a full load condition, to reduce NO.sub.x emissions to desired levels.