Dual-fuel engine systems for work vehicle
AssigneeDeere & Company
InventorsDanan Dou, Craig W. Lohmann
Life of this patent
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Abstract
A dual-fuel engine system for a work vehicle includes an engine with a piston-cylinder arrangement defining a combustion chamber and an engine control unit (ECU). The ECU has 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 5 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. The second predetermined threshold is greater than the first predetermined threshold.
Claims18
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.
An engine control unit (ECU) for a work vehicle having a dual-fuel engine system having an engine being a compression ignition engine comprising a piston-cylinder arrangement defining a combustion chamber and an aftertreatment system disposed in an exhaust flow path between the engine and an exhaust vent of the work vehicle, the ECU comprising:
- a controller having a processing and memory architecture configured to execute instructions according to an operating load of the engine to deliver to the engine only a first fuel when the operating load is less than a first predetermined threshold, deliver to the engine 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;
- wherein the exhaust flow path is free of any injected catalytic reductant.
Dependencies are inferred from the claim text.