| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a device highly accurately calculating an SCR catalyst temperature and appropriately controlling input and input timing of a reducing agent, to secure denitrification rate efficiency, reduce slip of NH3, and reduce an operation cost of a diesel engine along with saving of urea aqueous solution. <P>SOLUTION: The NOx cleaning device for an internal combustion engine is disposed to an exhaust pipe 2 of the engine 1, calculates an internal temperature of the SCR catalyst 11 from exhaust gas temperatures of an inlet and an outlet of the SCR catalyst 11, and estimates an amount of adsorption of the reducing agent to the SCR catalyst based on the internal temperature of the SCR catalyst 11. Therefore, a reducing agent amount to be sprayed in exhaust gas is highly accurately calculated to spray the reducing agent into the exhaust gas by a urea aqueous solution spray device 6 and thereby to reduce slip quantities of the NH3 and NOx. <P>COPYRIGHT: (C)2011,JPO&INPIT |
