| 摘要 |
PROBLEM TO BE SOLVED: To suppress excess and deficiency in amount of produced ozone.SOLUTION: There is provided an ozone supply device for oxidizing NO contained in the exhaust gas into NOby supplying ozone to an upstream side of NOx removal device 12 in the exhaust gas passage 10ex of an internal combustion engine 10. This ozone supply device comprises: an ozonizer 30 for generating ozone through electrical discharge; taking means 41a and a control means 41b to be described as follows. The taking means 41a takes as NO reduction correlation values, some physical quantities related to a cause for reducing NOinto NO in a portion upstream of the NOx removal device 12, of the exhaust passage 10ex or within the NOx removal device. The control means 41b controls ozone production amount by the ozonizer 30 in accordance with NO reduction correlation value got by the taking means 41a.SELECTED DRAWING: Figure 1 |
