Method and device for regenerating a particulate filter in a motor vehicle with a hybrid drive

A method for regenerating a particulate filter in an exhaust gas channel of a motor vehicle with a hybrid drive consisting of an electric motor and an internal combustion engine, whereby the particulate filter is arranged in the exhaust gas channel of the internal combustion engine, and whereby the internal combustion engine is connected to an air supply means comprising a throttle valve, said method comprising the following steps:

• operating the motor vehicle in the hybrid mode of operation, whereby the exhaust gas of the internal combustion engine is transported through the particulate filter during the operation of the internal combustion engine,
• ascertaining the load state of the particulate filter,
• initiating the regeneration of the particulate filter once the load state of the particulate filter has reached a defined maximum load state,
• carrying out a regeneration process of the particulate filter, whereby the internal combustion engine and the electric motor are coupled during the regeneration and the electric motor lugs the internal combustion engine, whereby
• transporting air, by the internal combustion engine, into the exhaust gas channel in order to oxidize the soot particles retained in the particulate filter, and
• controlling the throttle valve of the air supply means of the internal combustion engine during the regeneration of the particulate filter, irrespective of any torque demand the driver makes of the hybrid drive, while the internal combustion engine is dragged by the electric motor and fuel supply to the internal combustion engine is switched off,
• wherein the method is carried out in an externally ignited internal combustion engine, and
• wherein the throttle valve is closed at the end of the regeneration of the particulate filter.