US 11,835,002 B2
Methods and systems for compression ignition in a multi fuel engine
Adam Edgar Klingbeil, Ballston Lake, NY (US); Eric Dillen, Edinboro, PA (US); and Thomas Michael Lavertu, Ballston Lake, NY (US)
Assigned to TRANSPORTATION IP HOLDINGS, LLC, Norwalk, CT (US)
Filed by Transportation IP Holdings, LLC, Norwalk, CT (US)
Filed on Dec. 14, 2021, as Appl. No. 17/644,326.
Prior Publication US 2023/0184181 A1, Jun. 15, 2023
Int. Cl. F02D 19/06 (2006.01); F02D 41/06 (2006.01); F02D 41/00 (2006.01)
CPC F02D 19/0694 (2013.01) [F02D 19/061 (2013.01); F02D 19/0689 (2013.01); F02D 41/0047 (2013.01); F02D 41/062 (2013.01); F02D 2200/021 (2013.01); F02D 2200/101 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for an engine, comprising:
injecting hydrogen as fuel to one or more engine cylinders via a corresponding direct fuel injector coupled to each of the one or more engine cylinders that is spaced away from an intake valve of the respective one or more engine cylinders;
compression igniting the injected hydrogen;
during injecting only hydrogen to the one or more engine cylinders, supplying an amount of exhaust gas recirculation (EGR) to each of the one or more engine cylinders through an EGR passage that is in fluidic communication with one or more intake valves of the one or more engine cylinders and one or more exhaust valves of the one or more engine cylinders, the amount of EGR mixing with the hydrogen within each of the one or more engine cylinders;
wherein the amount of EGR is adjusted based on the amount of hydrogen injected into the one or more engine cylinders;
continue injecting only hydrogen to the one or more engine cylinders via the corresponding direct fuel injector coupled to each of the one or more engine cylinders for a pre-calibrated number of engine cycles; then
responsive to injecting only hydrogen to the one or more engine cylinders via the corresponding direct fuel injector coupled to each of the one or more engine cylinders for the pre-calibrated number of engine cycles, inject a liquid fuel from the same corresponding direct fuel injectors that previously injected only hydrogen.