Controlling desulfurization of exhaust gas purification device arranged in exhaust gas tract of IC engine comprises determining amount of sulfur

摘要

Controlling desulfurization of an exhaust gas purification device arranged in the exhaust gas tract (12) of an IC engine (10) comprises determining the amount of a sulfur-containing component of the exhaust gas from a signal produced by a sulfur-sensitive measuring device (22) arranged in the exhaust gas tract and/or in a fuel system of an IC engine; and controlling the desulfurization of the exhaust gas purification device depending on the amount of the sulfur-containing component of the exhaust gas. An Independent claim is also included for a device for controlling desulfurization of an exhaust gas purification device arranged in the exhaust gas tract of an IC engine comprising a measuring device (22) and a control device (26). Preferred Features: The exhaust gas purification device is a NOx absorber, a NOx storage catalyst, an oxidation catalyst and/or a 3-way catalyst. The duration of the desulfurization is depends on the amount of sulfur-containing component of the exhaust gas and/or an alternating lean-rich bombardment of the exhaust gas purification device during desulfurization is controlled. The sulfur-containing component is SO2 and/or H2S. A sulfur charge of the exhaust gas purification device is determined depending on the amount of sulfur-containing component of the exhaust gas upstream of the device. The duration of regeneration is controlled depending on the amount of sulfur-containing component determined during desulfurization downstream of the exhaust gas purification device.