Patent ID: 6637190
Filing Date: 2003-10-28
Classification: F01N,F02D,Y02A

Abstract:
A process for the desulfurization of at least one NOx storage catalytic converter arranged in an exhaust pipe of an internal-combustion engine, comprising the steps of:setting a minimum desulfurization temperature at the NOx storage catalytic converter and an operating mode of the internal-combustion engine with lambda&lE;1; at least temporarily influencing one operating parameter of the internal combustion engine in order to reach at least one of the operating mode and the minimum temperature; and initiating the desulfurization as a function of a ratio of the NOx concentration upstream and downstream of the NOx storage catalytic converter as a function of an NOx mass a incorporated in the NOx storage catalytic converter (degree of sulfurization), and as a function of at least one of a current lambda value and a current temperature of the NOx storage catalytic converter.