Method for operating an internal combustion engine

A system, comprising:

• a controller configured to control operation of an internal combustion engine using an air-fuel mixture comprising a fuel mixture and air, wherein the controller is configured to:
• obtain a hydrogen content of the fuel mixture comprising first and second fuels, wherein the first fuel comprises natural gas and the second fuel comprises hydrogen;
• and
• control at least an ignition timing as a function of the hydrogen content of the fuel mixture independent of a target power output of the internal combustion engine, wherein the higher an amount of hydrogen in the fuel mixture the later the ignition timing is set for at least partially compensating a shift of a center of combustion due to a higher flame speed of hydrogen compared to the first fuel, wherein a boost pressure by a compressor is adapted in a feedback control as a function of a continuously measured NOx content of an exhaust gas of the internal combustion engine.

A system, comprising:

• an internal combustion engine;
• and
• a controller configured to control operation of the internal combustion engine using an air-fuel mixture comprising a fuel mixture and air, wherein the controller is configured to:
• obtain a hydrogen content of the fuel mixture comprising first and second fuels, wherein the first fuel comprises natural gas and the second fuel comprises hydrogen;
• and
• control at least an ignition timing as a function of the hydrogen content of the fuel mixture independent of a target power output of the internal combustion engine, wherein the higher an amount of hydrogen in the fuel mixture the later the ignition timing is set for at least partially compensating a shift of a center of combustion due to a higher flame speed of hydrogen compared to the first fuel, wherein a boost pressure by a compressor is adapted in a feedback control as a function of a continuously measured NOx content of an exhaust gas of the internal combustion engine.