| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust emission control device for an internal combustion engine that can certainly suppress CO or HC in exhaust gas exiting from an exhaust-gas purification catalyst during catalyst warm-up even when a capturing amount of the catalyst is suppressed, and can achieve both an exhaust-gas purification performance and a reduction of cost. <P>SOLUTION: The exhaust emission control device for the internal combustion engine includes an EGR means for re-circulating a part of exhaust gas from the engine to an intake manifold side through an EGR passage, and an exhaust-gas purification catalyst for purifying an exhaust component discharged into an exhaust passage. The exhaust emission control device also includes a catalyst floor temperature sensor for detecting a catalyst floor temperature of the exhaust-gas purification catalyst. An ECU 50 includes functions as a basic EGR amount calculating means for calculating a basic EGR amount based on an operating condition of the engine, and an amount-reduction compensating means for executing an amount-reduction compensation of the basic EGR amount within a range of catalyst temperature up to its reach of a predetermined exhaust-gas purification temperature Tca in accordance with a rise of the purification performance during the catalyst warm-up and temperature-increase based on the detected temperature Tc by the catalyst floor temperature sensor. <P>COPYRIGHT: (C)2009,JPO&INPIT |
