| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust emission control device for internal combustion engine equipped with a NOx catalyst functioning effectively with addition of a reducing agent capable of optimizing the purifying efficiency for NOx existing in the exhaust gas by obtaining the desired reduction components in the exhaust gas even in the case the easiness for the reducing agent to evaporate or be turned into fine particles varies. SOLUTION: When fuel injection to the exhaust system 40 of a Diesel engine 1 is to be executed, an electronic control device (ECU) 80 to perform the operational control of the engine 1 senses or presumes the rate of exhaust flow (or flow velocity), exhaust gas temperature and the inner wall temperature of the exhaust passage, and on the basis of obtained parameters, presumes the evaporating amount (amount turned into particulates) of the fuel supplied in injection from a fuel adding nozzle 17, and the control of deciding the injection amount and timing is conducted with the obtained data taken into account.
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