| abstract |
An exhaust purifying method and apparatus of an internal combustion enginenis provided with an exhaust switch valve (71) for switching a flow of exhaust gasnflowing into an exhaust filter (22). By switching the exhaust switch valve (71), thenexhaust gas is fed from one side and the other side of the filter (71), thereby stirringnthe soot (particulates) in the exhaust gas deposited on the filter having a NOxnabsorbent and an active-oxygen discharging agent supported thereon. Thus, the sootnin the exhaust gas is continuously burned. Moreover, the switching of the exhaustnswitch valve and the rich spike are inhibited from being conducted simultaneously. Innthe case where the rich spike is conducted in order to discharge and reduce NOxnabsorbed in the NOx absorbent, the exhaust gas containing a large amount of HC andnCO can be prevented from being discharged into the atmosphere without beingnpurified. |