Patent ID: 7219008
Filing Date: 2007-05-15
Classification: F01N,F02D,Y02A,Y02T

Abstract:
1. A device for estimating a nitrogen oxide mass stored in a nitrogen oxide catalytic trapping device, comprising a catalytic phase, and traversed by the exhaust gases of an internal combustion engine of a motor vehicle, comprising an electronic control unit, wherein the device comprises: means for splitting the geometry of the catalytic trapping device into several (n) perfectly-stirred, successive individual reactors; and means for estimating the nitrogen oxide mass present in the catalytic trapping device by combining a thermal model allowing calculation of the temperature variation of the catalytic phase of the catalytic trapping device when it is traversed by the exhaust gases, and an adsorption model allowing calculation at any time of the nitrogen oxide mass stored in the catalytic trapping device as a function of the characteristics of the catalytic trapping device, the temperatures from the thermal model for each individual reactor, and the mass flow of exhaust gas from the engine.