ENGINE NOx EMISSION AMOUNT CALCULATING DEVICE

摘要

PPROBLEM TO BE SOLVED: To provide an engine NOx emission amount calculating device can accurately calculate NOx emission amount by suppressing influence caused by variation in characteristics of a supercharger and secular change. PSOLUTION: A basic emission amount calculating part 64 reads out and outputs a basic NOx emission amount QNb corresponding to a fuel injection amount (q) and an engine speed Ne from NOx emission amount map. A pressure deviation calculating part 66 previously stores a reference boost pressure Pbase which is a boost pressure obtained in a reference operation point set in advance when the NOx emission amount map is set, and calculates a pressure deviation P between an actual boost pressure P when an engine 1 is operated in the reference operation point and the reference boost pressure Pbase. A correction factor calculating part 68 reads out and outputs a correction factor K corresponding to the pressure deviation P from a correction factor map, and a correction calculating part 70 calculates NOx emission amount QNc as an actual NOx emission amount from the engine 1 by multiplying the basic NOx emission amount QNb by the correction factor K. PCOPYRIGHT: (C)2010,JPO&INPIT