发明名称 |
AN EXHAUST GAS PURIFICATION DEVICE FOR AN INTERNAL COMBUSTION ENGINE |
摘要 |
<p>In the exhaust gas purification device of the present invention, No. 1 cylinder of the engine is operated at a rich air-fuel ratio and other cylinders (No. 2 to No. 4) are operated at a lean air-fuel ratio. The exhaust gases from the No. 1 and No. 2 cylinders are mixed each other and form a lean air-fuel ratio exhaust gas mixture. Further, since the air-fuel ratio of the No. 2 cylinder is lean, the exhaust gas from the No. 2 cylinder contains a relatively large amount of NOX. Therefore, an exhaust gas mixture supplied to the three-way catalyst has a rich air-fuel ratio and contains a relatively large amount of NOX. Therefore, at the three-way catalyst, a part of NOX in the exhaust gas mixture is converted to NH3. The exhaust gas mixture flowing out from the three-way catalyst and the lean exhaust gas from the No. 3 and No. 4 flows into a common exhaust gas passage where they mix each other to form a lean exhaust gas containing NH3 from the three-way catalyst and NOX from the No. 3 and No. 4 cylinders. This lean exhaust gas flows into a denitrating catalyst disposed on the common exhaust gas passage. Therefore, NOX in the exhaust gas is reduced by NH3 at the denitrating catalyst. <IMAGE></p> |
申请公布号 |
KR100202811(B1) |
申请公布日期 |
1999.06.15 |
申请号 |
KR19970014361 |
申请日期 |
1997.04.18 |
申请人 |
TOYOTA JIDOSHA KABUSHIKI KAISHA |
发明人 |
KINUGASA, YUKIO;ITOU, TAKAAKI;SUZUKI, NAOTO;TAKEUCHI, KOICHI;TANAKA, HIROSHI;FUWA, NAOHIDE |
分类号 |
F02B75/10;B01D53/94;F01N3/08;F01N3/20;F01N3/24;F01N3/28;F01N9/00;F01N13/02;F01N13/04;F02B75/18;F02D41/00;F02D41/02;F02D41/04;F02D41/14;F02D41/34;F02D43/00;F02D45/00;F02M25/07;F02P5/15;(IPC1-7):F01N3/10;F02M35/06 |
主分类号 |
F02B75/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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