METHOD OF OPERATING SYSTEM OF CONTROL OVER OFFGAS TOXICITY REDUCTION WITH SELECTIVE REDUCTION CATALYST AND DEVICE ARRANGED THERE AHEAD TO CATALYSE REDUCTION FOR OFFGAS TOXICITY DECREASE Russian patent published in 2013 - IPC F01N3/20 F01N11/00 

FIELD: engines and pumps.

SUBSTANCE: proposed method comprises estimation of ageing of catalytic reduction device 3 used for neutralisation of waste gases. In compliance with this invention, ageing of catalytic reduction device 3 used for neutralisation of waste gases is defined by relationship between content of hydrocarbons present in offgas and conversion of nitrogen oxide by selective reduction catalyst 5.

EFFECT: efficient determination of ageing of catalytic reduction device used for neutralisation of waste gases.

10 cl, 6 dwg