| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust emission control device of an internal combustion engine, suppressing temperature rise of a filter with a simple construction and effectively preventing the generation of cracks and melting caused by excessive temperature rise of the filter. <P>SOLUTION: The exhaust emission control device includes: the filter 32 provided in an exhaust system of the internal combustion engine 10 for collecting particulate matters in exhaust; an EGR passage 19; an EGR valve 21; a filter accumulation amount estimation means 41 estimating and outputting an accumulation amount of the particulate matters collected in the filter 32; a filter temperature estimation means 42 estimating and outputting temperature of the filter; and an EGR valve control means 44 controlling opening of the EGR valve 21 for reducing an oxygen concentration in the exhaust gas flowing in the filter 32 if an output value of the filter accumulation amount estimation means 41 is not smaller than a predetermined amount and an output value of the filter temperature estimation means 42 is not smaller than a predetermined temperature when the operation condition of the internal combustion engine 10 varies from high load operation to low load operation or idle operation. <P>COPYRIGHT: (C)2012,JPO&INPIT |
