FIELD: engines.
SUBSTANCE: invention relates to system for determining wear of exhaust gas discharge control device. System for determining wear of exhaust gas discharge control device, which includes: catalyst for selective recovery of NOx, secured at path of internal combustion engine exhaust gas and using ammonia as reducing agent; reducing agent supply unit, which supplies ammonia or ammonia precursor into exhaust gas that flows in catalyst for selective recovery of NOx, upstream of said catalyst for selective recovery of NOx; catalyst arranged downstream of catalyst for selective recovery of NOx and performing oxidizing capacity; sensor NOx, provided downstream of catalyst with oxidizing capacity, designed to detect NOx in exhaust gas from catalyst with oxidizing capacity, as well as detection of ammonia in exhaust gas in form of NOx; unit for determining wear, which performs wear detection of catalyst for selective recovery of NOx based on value measured by sensor NOx. System for determining wear comprises: unit for calculating output amount, which calculates when amount of ammonia, adsorbed by catalyst for selective recovery of NOx, is greater than value of equilibrium adsorption, which is a value of ammonia adsorption when ammonia adsorption on catalyst for selective recovery of NOx and ammonia from it are in equilibrium state, excess amount of ammonia, flowing into catalyst with oxidizing capacity, at least one of amounrt of ammonia from catalyst with oxidizing capacity, and amount of ammonia, transformed into NOx on catalyst with oxidizing capacity, or total value of both values; unit for determining threshold wear, which, when value calculated by unit for calculating output amount, exceeds threshold value, limits use of value measured by sensor NOx when determining wear with help of unit for determining wear, or prohibits proper determination of wear with help of unit for determining wear.
EFFECT: technical result is increased accuracy of wear determination in system of exhaust gas discharge control device.
5 cl, 12 dwg
