Internal-combustion engines – Combustion chamber means having fuel injection only – Using multiple injectors or injections
Patent
1983-11-17
1985-10-01
Lall, Parshotam S.
Internal-combustion engines
Combustion chamber means having fuel injection only
Using multiple injectors or injections
123300, 123276, F02B 300
Patent
active
045439303
ABSTRACT:
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.degree. to 180.degree. 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.degree. below the head of the cylinder.
REFERENCES:
patent: 2692587 (1954-10-01), Barber
patent: 2960079 (1960-11-01), Monnot et al.
patent: 4217871 (1980-08-01), Ohashi et al.
patent: 4399786 (1983-08-01), Holmer
patent: 4414940 (1983-11-01), Lloyd
Alternative Fuels for Medium-Speed Diesel Engines (AFFmSDE) Project Second Research Phase Final Report Synthetic Fuels, Alcohol Emulsions, Off-Specification Diesel Fuels and Methanol, Q. A. Baker, S. Ariga, and A. M. Alpert, Sep. 1981, (Note Pertinent pp. 119-123).
"The Effect of the Vigom Process on the Combustion in Diesel Engines", by Eyzat et al., SAE paper, Oct. 1964.
Lall Parshotam S.
Southwest Research Institute
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