Internal combustion engine arrangement

An internal combustion engine arrangement comprising:

• an internal combustion engine;
• a catalytic converter;
• a first lambda (λ) sensor configured to determine a first λ value;
• a second λ sensor configured to determine a second voltage;
• and
• a controller configured to determine a maximum hydrogen (H2) production capacity of the catalytic converter,
• wherein the catalytic converter is arranged downstream of the internal combustion engine,
• wherein the controller is configured to determine the maximum H2 production capacity of the catalytic converter based on a first function that correlates an H2 production of the internal combustion engine with first internal combustion engine parameters,
• wherein the first λ sensor is arranged downstream of the internal combustion engine and upstream of the catalytic converter and wherein the second λ sensor is arranged downstream of the catalytic converter, and
• wherein the controller is configured to determine the maximum hydrogen (H2) production capacity based on a second function that correlates the H2 production of the internal combustion engine determined using the first function, the first internal combustion engine parameters, a first temperature of the catalytic converter, the first λ value of the internal combustion engine and a characteristic behaviour of the second λ sensor to determine an expected reference voltage for the second A sensor.