ENGINE EMISSION CONTROL DEVICE

摘要

PROBLEM TO BE SOLVED: To suppress the generation of ill odors during opening/closing a tank storing reducer.

SOLUTION: A NOx reduction catalyst 3 is mounted in an exhaust pipe 2 for an engine 1 and urea water stored in a reducer tank 10 is supplied to the NOx reduction catalyst 3 by a reducer supply device 7. Cooling water heated by the engine 1 is circulated in the tank 10 to heat the urea water stored in the tank 10. When the temperature of the cooling water is not lower than a temperature which allows the generation of ammonia from the urea water, a cooling water circuit 20 is shut off by a solenoid on-off valve 22. Thus, the circulation of the high temperature cooling water in the reducer tank 10 is prevented, therefore suppressing the generation of ammonia from the urea water in the tank 10 and suppressing the generation of ill odors during opening/closing the tank 10.

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