| 摘要 |
PROBLEM TO BE SOLVED: To efficiently remove NOx having knocking promotion effects and prevent corrosion of an exhaust pipe due to N2O or N-acid converted from NOx by providing an electric discharge part having an electrode in an exhaust circulating pipe, and connecting the electrode to a high voltage generating source. SOLUTION: For circulating one part of exhaust of an engine 1 into an intake pipe 5, an EGR pipe 8 is provided for connecting an exhaust pipe 6 to the intake pipe 5, and an electric discharge part 10 is provided on the way of the EGR pipe 8. Namely, a positive electrode 12 is fitted to the EGR pipe 8, and the positive electrode 12 is connected to a high voltage generating source 14 via a line 13. By generating corona discharge from the positive electrode 12 of the discharge part 10, NOx in exhaust gas flowing in the EGR pipe 8 is decomposed and removed. Hereby generation of knocking is restrained. The discharge part 10 may be provided in the exhaust pipe 6, and in this case, the arranged position is set on the upper stream side of the branch point 6a of the EGR pipe 8, namely on the cylinder side.
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