Patent ID: 11873772
Assignee: CUMMINS POWER GENERATION LIMITED
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 13:
14. A dual fuel engine system operable in a dual fuel mode, the dual fuel engine system comprising:
an internal combustion engine having at least one engine bank;
at least one gas injector operably coupled to the internal combustion engine; and
at least one controller communicably coupled to the internal combustion engine and the at least one gas injector;
wherein the at least one controller is configured to:
determine a gas flow target for the internal combustion engine, the gas flow target being based on a gas power target of the internal combustion engine, a thermal efficiency estimate of the internal combustion engine, and a lower heating value (LHV) within the internal combustion engine;
adjust the gas flow target based on at least one of a measured gas temperature or a measured gas injector pressure to determine an adjusted gas flow target for the dual fuel mode;
determine at least one base gas injector command based on the adjusted gas flow target, a gas substitution rate estimate, and a gas substitution rate target; and
determine, based on the at least one base injector command, a gas injector command, a gas injector command for the at least one engine bank,
wherein the at least one controller is further configured to determine the gas flow target by dividing the gas power target by a thermal efficiency estimate and a lower heating value (LHV), wherein the LHV is determined on a look-up table based on an estimated methane number.