METHOD AND DEVICE, WHICH ARE USED TO REDUCE CONTENT OF NITROGEN OXIDES IN EXIT GASES OF INTERNAL COMBUSTION ENGINE OF TRANSPORT VEHICLE Russian patent published in 2013 - IPC F01N3/08 F01N5/02 F02D35/02 F02M25/07 

FIELD: engines and pumps.

SUBSTANCE: reduction method of content of nitrogen oxides (NO_x) in exit gases is intended for internal combustion engine (10) installed on transport vehicle and containing at least one cylinder (11), inlet air supply pipeline (12), outlet pipeline (14) for removal of exit gases to exit gas neutralisation system (40) used to reduce the hazardous emission level of internal combustion engine (10). Engine includes exit gas recirculation system (80) supplying the exit gases from outlet pipeline (14) to inlet pipeline (12) of internal combustion engine (10). After outlet pipeline (14) in flow of exit gases there installed in series is turbine (54) of turbosupercharger (50) and turbine (60) of turbocompound, which are used at least as two energy converters (54, 60) to absorb the energy of exit gases. Control of internal combustion engine (10) operation in high and/or average load mode is performed so that at certain output power it can operate with increased load and reduced rotation frequency of crankshaft in comparison to rotation frequency usually chosen for the above certain output power. Temperature rise of exit gases, which is achieved due to operation of internal combustion engine (10) with reduced rotation frequency of crankshaft, is performed up to the first temperature, which is sufficient for actuation at least of two turbines (54, 60) and setting of certain exit gas temperature after those turbines. Cooling of exit gases having increased temperature on two turbines (54, 60) is performed to the temperature in the desired temperature range contributing to NO_x neutralisation in exit gas neutralisation system (40). Variation of rotation frequency of crankshaft of internal combustion engine (10) is performed depending on NO_x content in exit gases after they pass through exit gas neutralisation system (40) and/or depending on design capability of exit gas neutralisation system (40) as to NO_x neutralisation. Nitrogen oxide content reduction device has been described.

EFFECT: reduction of hazardous emission level and economy of fuel is provided.

14 cl, 3 dwg