Patent ID: 6711892
Filing Date: 2004-03-30
Classification: F01N,F02D,F02M,Y02T

Abstract:
An exhaust emission control device of an internal-combustion engine, comprising:exhaust emission control means located in an exhaust passage of the internal-combustion engine and adapted to reduce harmful substances in exhaust gas under a given exhaust pressure condition; an exhaust sensor, provided in the exhaust passage and upstream of said exhaust emission control means, for detecting and outputting the concentration of a specific exhaust component in said exhaust gas at an upstream of the exhaust emission control means, the output of the exhaust sensor being also indicative of an actual exhaust gas pressure upstream of said exhaust emission control means, and said exhaust sensor being the only exhaust sensor provided in the exhaust passage; and performance lowering identifying means for identifying lowering of the performance of said exhaust emission control means by detecting a failure to fulfill said given exhaust pressure condition based on the output of said exhaust sensor.