Patent ID: 6508057
Filing Date: 2003-01-21
Classification: B01D,F01N,F02D,Y02C,Y02T

Abstract:
A device for elimination of nitrogen oxides in an exhaust line of a lean-burn internal-combustion engine, comprising a nitrogen oxides (NOx) trap for trapping nitrogen oxides, a hydrocarbon treating catalyst placed upstream from the nitrogen oxides trap, a hydrocarbon injector placed upstream from the hydrocarbon treating catalyst, a means for measuring the exhaust gas mixture strength, characterized in that said hydrocarbon injector is placed on the exhaust line and in that hydrocarbon catalyst is a partial (or controlled) oxidation catalyst for the hydrocarbons injection, allowing to obtain, at the outlet thereof, gases with a low oxygen (O2) concentration and high carbon monoxide (CO) and hydrogen (H2) concentrations, further comprising a means to record and to process data coming from various detectors or stored so as to control the hydrocarbon injector to perform effective regeneration of the NOx trap without disrupting the smooth running of the engine.