| 摘要 |
In an exhaust gas purifying system wherein an NOx occlusion reduction type catalyst (30) including a catalytic metal and an NOx occluding substance is installed in an exhaust passage (3) of an engine (10), a restore processing against the sulfur poisoning of the NOx occlusion reduction type catalyst (30) is executed, by performing a lax rich control for controlling the air/fuel ratio of the exhaust gas to the theoretical air/fuel ratio or slightly lower than the theoretical air/fuel ratio, when the NOx occlusion reduction type catalyst (30) is heated equal or superior to the sulfur purge temperature. <??>NOx is purified up effectively, by excluding effects of the sulfur poisoning, suppressing the deterioration of fuel-efficiency, by the control method for exhaust gas purifying system. <IMAGE> |
