US 12,486,809 B2
Dual fuel system and operating strategy metering fuel via varied fuel pump output
Hoisan Kim, Dunlap, IL (US)
Assigned to Caterpillar Inc., Peoria, IL (US)
Filed by Caterpillar Inc., Peoria, IL (US)
Filed on Apr. 5, 2024, as Appl. No. 18/627,492.
Prior Publication US 2025/0314211 A1, Oct. 9, 2025
Int. Cl. F02D 19/06 (2006.01); F02D 19/08 (2006.01)
CPC F02D 19/0694 (2013.01) [F02D 19/0649 (2013.01); F02D 19/0681 (2013.01); F02D 19/0684 (2013.01); F02D 19/0689 (2013.01); F02D 19/08 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A dual fuel system comprising:
a first fuel supply of a first fuel;
a second fuel supply of a second fuel;
a fuel injector including a nozzle having formed therein a plurality of nozzle outlets, a first fuel passage extending from a first fuel inlet for the first fuel, and a second fuel passage extending from a second fuel inlet for the second fuel; and
the fuel injector further having formed therein a combined-fuel outlet passage, and including a nozzle check movable to open and close the combined-fuel outlet passage to the plurality of nozzle outlets, and a check valve positioned at least partially in the first fuel passage and movable between a first position permitting fuel flow to the combined-fuel outlet passage, and a second position preventing fuel backflow from the combined-fuel outlet passage.