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(11) | EP 2 532 852 A8 |
| (12) | CORRECTED EUROPEAN PATENT APPLICATION |
| published in accordance with Art. 153(4) EPC |
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| (54) | EXHAUST CLEANER FOR INTERNAL COMBUSTION ENGINE |
| (57) In an internal combustion engine, inside of an engine exhaust passage, a hydrocarbon
feed valve (15) and an exhaust purification catalyst (13) are arranged. At the time
of engine operation, the amplitude of change of the concentration of hydrocarbons
which flow into the exhaust purification catalyst (13) is made to become within a
predetermined range of amplitude by control of the injection amount of hydrocarbons
from the hydrocarbon feed valve (15), the concentration of hydrocarbons flowing into
the exhaust purification catalyst (13) is made to vibrate by a predetermined range
of period by control of the injection period of hydrocarbons from the hydrocarbon
feed valve (15), and thereby the NOx contained in the exhaust gas and the NOx stored in the exhaust purification catalyst (13) are reduced.
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