CPC F02D 19/0615 (2013.01) [F02D 19/021 (2013.01); F02D 19/0642 (2013.01); F02D 19/0644 (2013.01); F02D 19/0647 (2013.01); F02D 19/081 (2013.01)] | 20 Claims |
1. A method of operating a gaseous fuel internal combustion engine system comprising:
outputting a first control command to a first fuel admission valve to admit a gaseous fuel blend containing a gaseous hydrogen fuel (H2) from a first gaseous fuel supply into a gaseous fuel engine;
outputting a second control command to a second fuel admission valve to admit additional H2 from a second gaseous fuel supply into the gaseous fuel engine;
forming a combustion charge in a cylinder in the engine from the gaseous fuel blend, the additional H2, and air;
determining, by way of the second control command, an amount of the additional H2 based on a performance target for an engine parameter varying on the basis of a relative amount of H2 in the combustion charge;
burning the combustion charge in the cylinder; and
compensating, relative to the performance target, for a varied H2 concentration in the gaseous fuel blend by way of the additional H2.
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