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. 09, 2002
Filed:
Jul. 21, 2000
Applicant:
Inventors:
Göran Hellén, Vaasa, FI;
Seppo Tiensuu, Vaasa, FI;
Juha Kytölä, Vaasa, FI;
Tapani Humalamaa, Vaasa, FI;
Assignee:
Wartsila Nsd Oy AB, Helsinki, FI;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F02B 4/700 ;
U.S. Cl.
CPC ...
F02B 4/700 ;
Abstract
A method of reducing nitrogen oxide (NOx) emissions of a four-stroke turbo-charged piston engine by injecting water or steam into the combustion chamber of the engine, wherein the water injection is carried out at least substantially during the intake stroke of the engine. The injecting of water is initiated at the earliest when the inlet valve has moved through about 50% of the total range of its opening movement.