| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust emission control device that estimates an amount of a deposit of a denitration catalyst, changes a urea spray start temperature with respect to the estimated amount of the deposit, and performs high-efficiency denitration operation even while an exhaust temperature is low. <P>SOLUTION: An apparatus for control of the exhaust emission control device arranged with the denitration catalyst 3 for purifying a nitrogen oxide (NOx) in an exhaust system of an internal combustion engine includes: an urea water spray device 4 which supplies urea water to the denitration catalyst 3; a deposit amount estimator 86 which estimates the amount of the deposit generated by a decomposition operation of the urea water which is deposited on the denitration catalyst 3 and piping on the basis of the operation status of the internal combustion engine; and a spray controller 88 which changes a spray start temperature of a reduction agent on the basis of the estimated deposit amount. <P>COPYRIGHT: (C)2012,JPO&INPIT |
