| 摘要 |
PROBLEM TO BE SOLVED: To attain both reduction of consumption power required for generating ozone and improvement of adsorption of NOx through ozone addition by restricting excessive or lack of ozone added amount.SOLUTION: An ECU 40 [ozone addition control device] is applied to an exhaust gas purification system comprising a NOx purification device 12, a DOC 14 [oxidization device] and an ozone addition device 15, and further comprises first taking means 41a, second taking means 41b and control means 41c. The NOx purification device 12 has adsorption catalyst for adsorbing and reducing NOx for purification. The DOC 14 has oxidization catalyst for oxidizing CO or HC. The ozone addition device 15 adds ozone to the upstream side of the NOx purification device 12 and the downstream side of the DOC 14 in a discharged gas passage 10ex. The first taking means 41a takes an oxidization catalyst temperature, and the second taking means 41b takes an adsorption catalyst temperature. The control means 41c controls ozone adding amount added by the ozone addition device 15 on the basis of the acquired oxidization catalyst temperature and adsorption catalyst temperature.SELECTED DRAWING: Figure 1 |
