FIELD: machine engineering.
SUBSTANCE: device for ICE exhaust gases control comprises an urea addition valve (40) configured to add an aqueous urea solution to the exhaust gases discharged from the combustion chamber (17) into the exhaust passage (19). Units (41, 42) for selective catalytic neutralisation of reduction type are configured to reduce nitric oxide in the exhaust gases by selective catalytic neutralisation, in which ammonia produced from an aqueous urea solution is used as a reducing agent. An ammonia slip catalytic converter unit (43) contains an oxidation catalyst. In this case, the unit (43) is located downstream of the selective catalytic neutralisation units (41, 42) and is configured to oxidise the ammonia flowing out of the units (41, 42). The fuel additive unit is configured to add non-combustible fuel to the exhaust gas burned in the combustion chamber (17). The electronic control unit (56) is configured to control the fuel addition unit during the addition increase process when the volume of nitrogen oxide flowing out of the units (41, 42) is not restored in the required volume relative to the volume of nitrogen oxide entering the units (41, 42). Also, when the temperature of the catalyst bed in the unit (43) is in the temperature range where the nitrogen oxide in the exhaust gases can be reduced in the unit (43) by selective catalytic neutralisation, in which the hydrocarbon is used as a reducing agent so that the hydrocarbon volume in the exhaust gases, entering the unit (43), increases.
EFFECT: prevention of nitrogen oxide emissions into the atmosphere.
12 cl, 7 dwg
