Method and apparatus for regenerating a particulate filter in an exhaust system Y

The invention relates to a method for regenerating at least one exhaust-gas treatment component for filtering soot particles in an internal combustion engine having a first group of cylinders whose exhaust gases are passed through a first exhaust duct and the air / fuel mixture ratio via a first fuel metering system, controlled by a control unit, by a first control circuit for adjusting a first lambda value based on the signal of a first exhaust-gas probe which is arranged in the flow direction of the exhaust gas upstream of a catalyst in the exhaust passage is set, and at least one other group of cylinders whose exhaust gases through a further exhaust duct are guided and their fuel / air mixture ratio via a further fuel metering system by a further control circuit for setting of a further lambda value based on the signal of a further exhaust-gas probe, which in the flow direction of the exhaust gas in front of a Ka talysator is disposed in the exhaust passage, wherein the separate exhaust ducts are merged in accordance with the catalysts to form a common exhaust duct, in which a common catalyst is disposed. According to the invention it is provided that the exhaust gas treatment components are arranged to filter the soot particles each in the still separate exhaust ducts and for heating of this component for the first cylinder group made within the engines, and then by means of a lambda modulation of the lambda value in this cylinder group associated with the first exhaust guide is at the same time set in the further flue, a lambda value of λ 1, or that the exhaust gas aftertreatment component is arranged to filter the soot particles in the common exhaust duct and the regeneration of the particulate filter the component by means of engine-internal measures, and a concerted lambda modulation is performed in two exhaust gas guides. The invention further relates to a corresponding device for carrying out the inventive method. With the presented method and the apparatus for performing the method, an operating strategy in particular for Otto engines can be provided with a Y-exhaust system, with which a particularly low-emission regeneration of the soot filter the components is made possible. In addition, there are advantages in the desulfurization of