| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an NOx generating quantity estimating device of an internal combustion engine capable of always highly accurately estimating an NOx generating quantity in conformity with an actual NOx generating quantity. Ž<P>SOLUTION: When EGR valve opening θegr is a predetermined value A or more, the NOx generating ratio R determined from the intake oxygen concentration Doxy is selected by an estimation mode switching part 44, and is applied to a correction of an NOx quantity N in a multiplying part 42. When the EGR valve opening θegr is less than the predetermined value A, a correction factor K determined from a boost pressure map value Pmap and actual boost pressure P is selected by the estimation mode switching part 44, and is applied to the correction of the NOx quantity N in the multiplying part 42. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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