Staged direct injection diesel engine
Patent
·
OSTI ID:5899585
A diesel engine having staged injection for using lower cetane number fuels than No. 2 diesel fuel. The engine includes a main fuel injector and a pilot fuel injector. Pilot and main fuel may be the same fuel. The pilot injector injects from five to fifteen percent of the total fuel at timings from 20/sup 0/ to 180/sup 0/ BTDC depending upon the quantity of pilot fuel injected, the fuel cetane number and speed and load. The pilot fuel injector is directed toward the centerline of the diesel cylinder and at an angle toward the top of the piston, avoiding the walls of the cylinder. Stratification of the early injected pilot fuel is needed to reduce the fuel-air mixing rate, prevent loss of pilot fuel to quench zones, and keep the fuel-air mixture from becoming too fuel lean to become effective. In one embodiment, the pilot fuel injector includes a single hole for injection of the fuel and is directed at approximately 48/sup 0/ below the head of the cylinder.
- Assignee:
- Southwest Research Institute
- Patent Number(s):
- US 4543930
- OSTI ID:
- 5899585
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
33 ADVANCED PROPULSION SYSTEMS
330102* -- Internal Combustion Engines-- Diesel
330603 -- Vehicle Design Factors-- Engine System
ANTIKNOCK RATINGS
COMBUSTION CONTROL
CONTROL
DESIGN
DIESEL ENGINES
DIESEL FUELS
ENGINES
FUEL INJECTION SYSTEMS
FUEL SYSTEMS
FUEL-AIR RATIO
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
OPERATION
PETROLEUM PRODUCTS
TIMING PROPERTIES
330102* -- Internal Combustion Engines-- Diesel
330603 -- Vehicle Design Factors-- Engine System
ANTIKNOCK RATINGS
COMBUSTION CONTROL
CONTROL
DESIGN
DIESEL ENGINES
DIESEL FUELS
ENGINES
FUEL INJECTION SYSTEMS
FUEL SYSTEMS
FUEL-AIR RATIO
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
OPERATION
PETROLEUM PRODUCTS
TIMING PROPERTIES