Patent ID: 9051859
Filing Date: 2015-06-09
Classification: B01D,F01N,Y02C,Y02T

Abstract:
1. An exhaust gas purification device comprising: an exhaust gas processing device provided in an exhaust passage of an internal combustion engine; an in-exhaust pipe fuel injector provided in said exhaust passage on an upstream side of said exhaust gas processing device in order to supply fuel to said exhaust gas processing device; a NOx detecting sensor provided on a downstream side of said exhaust gas processing device; a temperature detecting sensor for detecting a temperature in said gas processing device; and an engine control unit configured to control combustion in said internal combustion engine; wherein said engine control unit is further configured to cause said in-exhaust pipe fuel injector to supply said fuel to said exhaust gas processing device to burn and remove PM trapped in said exhaust gas processing device; said engine control unit is further configured to store a detection value from said NOx detecting sensor as a NOx value at said outlet of said internal combustion engine when a fixed time has elapsed, an amount of variation in a temperature detection value from said temperature detecting sensor that has remained at or below a predetermined value continuously for said fixed time, and an amount of variation in said detection value from said NOx detecting sensor that has remained at or below a predetermined value continuously for said fixed time after said fuel has been supplied to said exhaust gas processing device from said in-exhaust pipe fuel injector; and said engine control unit is further configured to control combustion in said internal combustion engine based on said NOx value.