A control apparatus according to an embodiment of the present invention comprises urea-SCR catalyst 44, a urea-water supply section 46, a low pressure gas recirculating section including a low pressure EGR pipe 61 forming a low pressure EGR passage and a l...

A correction device for an air/fuel ratio sensor in the present invention has air/fuel ratio control means for controlling an air/fuel ratio of an exhaust gas on the upstream side from a catalyst (6) installed in an exhaust passage of an internal combustio...

A system includes an internal combustion engine producing an exhaust gas, an aftertreatment system receiving the exhaust gas, the aftertreatment system including a particulate filter positioned upstream of an SCR catalyst component, and a urea injector ope...