发明名称 |
Exhaust gas purifying apparatus for internal combustion engine |
摘要 |
An exhaust gas purifying apparatus comprises a control unit (29) operative to estimate an amount of NOx absorbed by a NOx trap material (17) disposed in an exhaust passage (10) and to make an air-fuel ratio richer so as thereby to cause the NOx trap material to release sulfur when the estimated amount of NOx absorption exceeds a specified amount. Further, the control unit (29) operative to estimate an amount of sulfur absorbed by the NOx trap material (17) and to make an air-fuel ratio richer and rising a temperature of exhaust gas so as thereby to cause the NOx trap material to release sulfur when the estimated amount of sulfur absorption exceeds a specified amount. The control unit restricts an air-fuel ratio from being made richer when the NOx trap material is not expected to absorb NOx due to progress of sulfur absorption resulting from conditionally the sulfur releasing.
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申请公布号 |
US6672052(B2) |
申请公布日期 |
2004.01.06 |
申请号 |
US20020162700 |
申请日期 |
2002.06.06 |
申请人 |
MAZDA MOTOR CORPORATION |
发明人 |
TAGA JUNICHI;YOKOTA KAZUYA;KUJI YOUICHI |
分类号 |
F02P5/15;F01N3/08;F01N3/20;F01N3/24;F01N3/28;F02D41/02;F02D41/04;F02D41/30;F02D45/00;(IPC1-7):F01N3/00 |
主分类号 |
F02P5/15 |
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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