| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust emission control device for an internal combustion engine, high in purifying efficiency with ozone.SOLUTION: The exhaust emission control device for the internal combustion engine includes an NOcatalyst, a DPF (Diesel Particulate Filter), an ozone supply means, an exhaust gas temperature detecting means and an ozone supply control means, and controls the ozone supply means to supply ozone to the NOcatalyst but not to the particle filter when an exhaust gas temperature is lower than 200°C, to supply ozone to the NOcatalyst and the particle filter when the exhaust gas temperature is in a range of 200°C or higher and 250°C or lower, to supply ozone to the particle filter but not to the NOcatalyst when the exhaust gas temperature is higher than 250°C and equal to or lower than 300°C, and to supply ozone to neither the NOcatalyst nor the particle filer when the exhaust gas temperature is higher than 300°C. |
