Method of detecting nitrogen compounds contained in exhaust gases, notably of internal-combustion engines

Abstract

A method of detecting nitrogen compound emissions in exhaust gases treated with selective catalytic reduction achieved by injecting a reducing agent into the gases and by passing these gases through a catalyst include sending the signal collected by a gas detector arranged in the exhaust gas downstream from the catalyst and representative of the amount of NOx (NOx) at the catalyst outlet to a computing unit, decomposing this signal into a value representative of the effective NOx amount (NOx) at the outlet of catalyst established by the SCR catalyst model, into a detector perturbation coefficient (k) and into a value representative of the ammonia amount (NH) via an integrated model so as to obtain NOx=NOx+k.NH, evaluating coefficient (k) from this decomposition, and determining the presence of nitrogen compounds downstream from the catalyst when coefficient (k) is greater than or equal to 1.