Patent ID: 7797930
Filing Date: 2010-09-21
Classification: F01N,Y02T

Abstract:
1. An exhaust gas purification device of an internal combustion engine, the exhaust gas purification device comprising: an exhaust gas after treatment device provided in an exhaust passage of the engine; a plurality of exhaust temperature sensors for sensing exhaust temperature on an inlet side of the exhaust gas after treatment device and exhaust temperature on an outlet side of the exhaust gas after treatment device; and a controller connected with the exhaust temperature sensors for performing exhaust temperature control based on output values of the exhaust temperature sensors, wherein the controller includes an erroneous mounting detector for determining that the exhaust temperature sensors are mounted erroneously in such a way that the exhaust temperature sensor for sensing the exhaust temperature on the inlet side of the exhaust gas after treatment device is mounted erroneously to sense the exhaust temperature on the outlet side of the exhaust gas after treatment device and the exhaust temperature sensor for sensing the exhaust temperature on the outlet side of the exhaust gas after treatment device is mounted erroneously to sense the exhaust temperature on the inlet side of the exhaust gas after treatment device if a change speed deviation value deviates from a predetermined normal range in an operation state in which the temperature of the exhaust gas flowing through the exhaust gas after treatment device changes rapidly, the change speed deviation value calculated based on a difference between change speed of the sensed outlet side exhaust temperature and change speed of the sensed inlet side exhaust temperature.