US Patent:
20220290641, Sep 15, 2022
Inventors:
- Peoria IL, US
David Todd Montgomery - Edelstein IL, US
Dana Ray Coldren - Secor IL, US
Chad Koci - Washington IL, US
Assignee:
Caterpillar Inc. - Peoria IL
International Classification:
F02M 43/04
F02D 19/06
Abstract:
A dual fuel system for an internal combustion engine includes a first fuel supply of a liquid pilot fuel, a primary fuel supply of a liquid primary fuel, and a dual fuel injector. The dual fuel injector includes a spill valve fluidly connected with a plunger cavity and movable to control a start of injection and an end of injection, and an admission valve. The admission valve is movable to admit a pilot fuel into the fuel injector, such that the pilot fuel is conveyed through an outlet check to form, within a primary fuel passage fluidly connected to the plunger cavity, a segmented fuel charge of leading pilot fuel and trailing primary fuel by displacing some of the primary fuel. The liquid pilot fuel may be a higher cetane/lower octane liquid fuel, and the primary fuel may be a lower cetane/higher octane liquid fuel.