| 摘要 |
The invention relates to a method for sulphur regeneration of a NOx adsorbing exhaust catalyst (18) by means of raising of its temperature, wherein the exhaust catalyst (18) is installed in an exhaust system (16, 17) which is connected to a combustion engine (1), which method comprises generation of an air/fuel mixture to the respective cylinder (3) of the engine (1). The invention is characterized in that it comprises alternating control of the combustion engine (1) between a first condition during which a comparatively rich exhaust gas mixture is supplied to the exhaust catalyst (18), wherein oxygen that is stored in the exhaust catalyst (18) is consumed at least partly during combustion of combustible compounds in the exhaust system (16, 17), for generation of heat, and a second condition during which a comparatively lean exhaust gas mixture is supplied to the exhaust catalyst (18), for storage of oxygen to said exhaust catalyst (18), and closure of said alternating control following the desorption of a predetermined amount of sulphur compounds from said exhaust catalyst (18). The invention also relates to an arrangement for such a sulphur regeneration. By means of the invention, an improved sulphur regeneration of a NOx adsorbing exhaust catalyst (18) in a motor vehicle is provided. |
