FIELD: process engineering.
SUBSTANCE: invention relates to exhaust gas cleaning. Batching of reducer cleaving ammonia to exhaust gas flow in ICE operated with excess air is performed in combination with exhaust gas after-cleaning unit. Note here that control unit dispenses reducer amount subject to model stored in memory unit and varies dispensed amount at appropriate phases of ICE operation. Besides, it compares magnitude measured by at last one NOx-transducer arranged behind SCR-catalyst with expected magnitude calculated by control unit from variation magnitude. Compliance between expected and actual magnitude defined by NOx-transducer allows making the conclusion on the presence of NOx and/or NH3. Batched amount is varied unless NOx prescribed concentration or NOx prescribed conversion calculated therefrom, or unless NH3 presence is defined from departure of actual magnitude from expected magnitude, or unless actual magnitude, hence, the sum of NOx and NH3, reaches minimum or preset magnitude. At least one correction is calculated from batched amount before variation and batched amount at prescribed NOx concentration or calculated NOx prescribed conversion calculated therefrom, from NH3 presence, or at minimum or preset actual magnitude, and memorised in the control unit memory. Then, at further batching jobs, batched amount is corrected with the help of said correction. Besides, defined is at least one magnitude of operating parameters is defined and stored along with said correction in aforesaid memory. Then, batched amount is corrected in operation by said correction relative to said operating parameter.
EFFECT: efficient adjustment of batched amount.
11 cl, 5 dwg
