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. 21, 1998
Filed:
May. 19, 1997
Uwe Gartner, Remshalden, DE;
Mercedes-Benz AG, Stuttgart, DE;
Abstract
In a method for reducing harmful emissions of a multi-cylinder internal combustion engine including for each cylinder intake and exhaust passages with intake and exhaust valves and an exhaust gas recirculation passage extending between an exhaust passage and the interior of a cylinder and including an exhaust gas recirculation valve, the exhaust gas recirculation valve of a first cylinder is opened during the intake cycle of the first cylinder at the beginning of the exhaust cycle of a second cylinder associated with the first cylinder and the exhaust gas recirculation valve is closed when the exhaust gas pressure in the exhaust gas recirculation passage from the second cylinder to the first cylinder falls below the combustion chamber pressure in the first cylinder or the charge air pressure in its intake passage or when a predetermined amount of exhaust gas has been recirculated.