US 12,435,676 B1
Dual-fuel engine systems for work vehicle
Danan Dou, Cedar Falls, IA (US); and Craig W. Lohmann, Cedar Falls, IA (US)
Assigned to DEERE & COMPANY, Moline, IL (US)
Filed by Deere & Company, Moline, IL (US)
Filed on Aug. 6, 2024, as Appl. No. 18/796,035.
Int. Cl. F02D 19/06 (2006.01); F02D 19/12 (2006.01)
CPC F02D 19/12 (2013.01) [F02D 19/0649 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A dual-fuel engine system for a work vehicle, comprising
an engine being a compression ignition engine with a piston-cylinder arrangement defining a combustion chamber;
an engine control unit (ECU) having a processing and memory architecture configured to execute instructions to deliver to the engine only a first fuel when an operating load of the engine is less than a first predetermined threshold, deliver only a second fuel and operate the engine stoichiometrically when the operating load is greater than a second predetermined threshold, wherein the second predetermined threshold is greater than the first predetermined threshold; and
an aftertreatment system disposed in an exhaust flow path between the engine and an exhaust vent, wherein the exhaust flow path is free of any injected catalytic reductant.