Desulfating a nox-trap in a diesel exhaust system
OwnerChristopher John Bennett, David Scott Lafyatisinventors
Life of this patent
Estimating the term…
Abstract
A method of removing sulfur from a NOx-trap composition positioned downstream and/or on an electric heater in a diesel exhaust system comprises the step of periodically heating the electric heater when the exhaust gas composition is lean, thereby to desorb SOx adsorbed on the NOx trap composition. An exhaust system for carrying out the method comprises an electric heater, a NOx-trap composition positioned downstream and/or on the electric heater and means for controlling the electric heater to periodically heat the NOx-trap composition when the exhaust gas composition is lean, thereby to desorb SOx adsorbed on the NOx-trap composition.
Claims10
An internal combustion engine comprising an exhaust system, which system comprising an electric heater and a NOx-trap composition, which NOx-trap composition is downstream and/or on the electric heater, characterised in that the engine is a diesel engine and in that the system further comprises means, in use, for desorbing SOx adsorbed on the NOx-trap composition by controlling the electric heater to periodically heat the NOx-trap composition when the exhaust gas composition is lean.
An engine according to any preceding claim, wherein the control means includes a pre-programmed microchip.
A vehicle including a diesel engine according to any preceding claim.
A method of removing sulfur from a NOx-trap composition in a diesel exhaust system, which NOx-trap composition is positioned downstream and/or on an electric heater, which method comprises the step of periodically heating the electric heater when the exhaust gas composition is lean, thereby to desorb SOx adsorbed on the NOx-trap composition.
Dependencies are inferred from the claim text.