US 11,840,979 B1
Gaseous fuel engine system and operating method for same
Jaswinder Singh, Dunlap, IL (US); Michael Bardell, Vail, AZ (US); Yongxian Gu, West Lafayette, IN (US); Eric L. Schroeder, Germantown Hills, IL (US); and Patrick J. Seiler, Peoria, IL (US)
Assigned to Caterpillar Inc., Peoria, IL (US)
Filed by Caterpillar Inc., Peoria, IL (US)
Filed on Jan. 23, 2023, as Appl. No. 18/100,003.
Int. Cl. F02D 41/40 (2006.01); F02D 41/00 (2006.01); F02D 41/30 (2006.01)
CPC F02D 41/402 (2013.01) [F02D 41/009 (2013.01); F02D 41/3094 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of operating an engine comprising:
moving an intake valve in an engine from a closed position to an opened position to fluidly connect a cylinder in the engine to an intake conduit feeding pressurized intake air;
injecting a gaseous hydrogen fuel into a flow of the pressurized intake air while the intake valve is opened;
controlling an injection timing of the gaseous hydrogen fuel relative to a position of the intake valve;
producing, based on the controlling an injection timing of the gaseous hydrogen fuel, a leading cooling flow of pressurized intake air into the cylinder, a trailing purging flow of pressurized intake air through the intake conduit, and a middle flow of both pressurized intake air and the gaseous hydrogen fuel into the cylinder;
moving the intake valve from the opened position to the closed position; and
igniting a combustion charge of the gaseous hydrogen fuel and pressurized intake air in the cylinder.