| 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.
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