|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||602/78 ; 600/280 ; 600/281 ; 600/599 ; 123/551|
|발명자 / 주소|
|출원인 / 주소|
|대리인 / 주소||
|인용정보||피인용 횟수 : 9 인용 특허 : 16|
An engine having in an exhaust system a lean NOx catalyst for purifying nitrogen oxide in an oxygen excessive exhaust gas by using a reducing agent, includes an intake air quantity decreasing device for decreasing a quantity of intake air flowing through an intake system when the nitrogen oxide needs to be purified by the lean NOx catalyst, and a combustion heater provided separately from the internal combustion engine also serves as a CO.sub.2 adding device for adding carbon dioxide to the intake air when a flowing quantity in the intake system decrease...
[ What is claimed is:] [1.]1. An internal combustion engine having in an exhaust system a lean NOx catalyst for purifying nitrogen oxide in an exhaust gas in an oxygen excessive state by using a reducing agent, comprising:CO.sub.2 concentration increasing means for increasing a concentration of carbon dioxide in an intake air flowing through an air intake system of said internal combustion engine; andintake air quantity decreasing means for decreasing a quantity of the intake air flowing through the intake system when the nitrogen oxide is required to be...