Patent ID: 8418442
Filing Date: 2013-04-16
Classification: F01N,F02D,Y02T

Abstract:
1. A method of treating the exhaust gas of an internal-combustion engine equipped with a particulate filter and an oxidation catalyst arranged upstream from said filter, wherein active regeneration of said filter is controlled by means of a dynamic control of a temperature T2 of said gas leaving said oxidation catalyst, the method comprising the following steps: i-determining a set point temperature Tc of said gas leaving said catalyst so as to provide active regeneration of said filter, ii-determining a temperature demand necessary for control of said temperature T2, iii-determining a stationary gain G defined as the ratio between the stationary value of a variation of T2 and a stationary value of a hydrocarbon mass flow rate variation that has induced said variation of T2, iv-correcting said gain G so as to take into account a gas flow rate variation at the inlet of said catalyst, the gain being transiently increased in relation to G for a gas flow rate increase and transiently decreased in relation to G for a gas flow rate decrease, v-defining a control law for a hydrocarbon flow rate at the inlet of said oxidation catalyst, through the ratio of said temperature demand and said corrected gain, vi-modifying the hydrocarbon flow rate by applying the control law so that the temperature of said gas leaving said catalyst meets said set point temperature.