Method for Operating an Internal Combustion Engine, a System for Carrying Out the Method and an Internal Combustion Engine

A method for operating an internal combustion engine, wherein the internal combustion engine comprises:

• at least one combustion chamber in which a fuel is at least partially burned with ambient air,
• an exhaust tract that is coupled to an outlet side of the at least one combustion chamber in a fluid communicating manner,
• wherein hydrogen is used as fuel for the internal combustion engine,
• wherein the internal combustion engine also has at least one NOx storage catalyst and an exhaust gas discharged from the at least one combustion chamber into the exhaust tract at least partially flows through the at least one NOx storage catalyst,
• wherein a lean air/hydrogen mixture is burned in the at least one combustion chamber in a first operating state,
• wherein the NOx storage catalyst is regenerated in a second operating state, and
• a rich air/hydrogen mixture is burned in the at least one combustion chamber in the second operating state,
• wherein the second operating state is set in an idling operation of the internal combustion engine and/or the second operating state is set in an overrun operation of the internal combustion engine.

A method for operating an internal combustion engine, wherein the internal combustion engine comprises:

• at least one combustion chamber in which a fuel is at least partially burned with ambient air,
• an exhaust tract which is coupled to an outlet side of the at least one combustion chamber in a fluid communicating manner,
• wherein hydrogen is used as fuel for the internal combustion engine,
• wherein the exhaust tract has a plurality of exhaust tract sections connected in parallel to one another, wherein at least two of the plurality of exhaust tract sections each have at least one NOx storage catalyst through which at least a portion of an exhaust gas discharged from the at least one combustion chamber into the exhaust tract flows at least temporarily,
• wherein the flow rate through the at least one NOx storage catalyst in at least one of the exhaust tract sections is at least temporarily changed,
• wherein the flow rate of the exhaust gas in a plurality of the exhaust tract sections, each exhaust tract section comprising the at least one NOx storage catalyst, is changed independently of each other by a throttling device variable in terms of its degree of throttling and respectively arranged upstream of the at least one NOx storage catalyst in the plurality the exhaust tract sections, and
• wherein a reduction agent for reducing the nitrogen oxides stored in the NOx storage catalyst is fed into the plurality of exhaust tract sections between the respective at least one NOx storage catalyst and the variable throttle device.