US 12,129,807 B2
Dual fuel engine operating strategy for optimized hydrogen and hydrocarbon fueling
Eric Lee Schroeder, Germantown Hills, IL (US); Michael Todd Graziano, Jr., Washington, IL (US); Jaswinder Singh, Dunlap, IL (US); and David Todd Montgomery, Edelstein, IL (US)
Assigned to Caterpillar Inc., Peoria, IL (US)
Filed by Caterpillar Inc., Peoria, IL (US)
Filed on May 5, 2022, as Appl. No. 17/737,528.
Prior Publication US 2023/0358186 A1, Nov. 9, 2023
Int. Cl. F02D 41/00 (2006.01); F02D 19/06 (2006.01); F02D 19/08 (2006.01); F02D 41/14 (2006.01)
CPC F02D 41/0027 (2013.01) [F02D 19/0644 (2013.01); F02D 19/081 (2013.01); F02D 41/1452 (2013.01); F02D 41/1406 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of operating an internal combustion engine system comprising:
combusting a gaseous hydrogen fuel (H2) and a gaseous hydrocarbon fuel (HC) at a first substitution ratio in a cylinder in an engine;
receiving an H2 availability input;
determining at least one of an H2 fueling command or an HC fueling command based on the H2 availability input and a history of CO2 output of the engine, wherein the history of CO2 output of the engine is indicative of a relative proportion of a CO2 output target reached that is less than the CO2 output target and cumulative of CO2 output of the engine over a time duration;
outputting the H2 fueling command and the HC fueling command to an H2 injector and an HC admission valve, respectively, each coupled to an intake system for the engine; and
combusting H2 and HC at a varied substitution ratio in the cylinder that is based on the H2 fueling command and the HC fueling command and less than a highest H2 to HC substitution ratio, for combustion of both H2 and HC in the cylinder, that is based on an H2 availability indicated by the H2 availability input.