| 摘要 |
PROBLEM TO BE SOLVED: To provide a nitrogen oxide cleaning apparatus for internal combustion engines having excelent cleanability and a simple structure. SOLUTION: This nitrogen oxide cleaning apparatus 1 is provided with fuel injection means 11 to 14, a fuel injection control means (ECU) 40, a plurality of catalyst units 21, 22, catalyst temperature judging means (exhaust gas sensor) 24 to 26, and operating condition detecting means. The first and second catalyst units 21 and 22 are disposed on upstream and downstream sides of an exhaust path in series each other. Cylinders are comprised of a first cylinder group connected to the upstream of the first catalyst unit 21 and a second cylinder group connected to the exhaust path between the catalyst units 21 and 22. The fuel injection control means outputs main fuel injection command and post fuel injection command to the respective cylinders, causing the quantity of fuel injection to be prescribed according to the temperature of the catalysts 21 and 22.
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