Staged direct injection diesel engine
- San Antonio, TX
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.
- Research Organization:
- Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
- DOE Contract Number:
- AC04-76
- Assignee:
- Southwest Research Institute (San Antonio, TX)
- Patent Number(s):
- US 4543930
- OSTI ID:
- 865610
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
direct
injection
diesel
engine
cetane
fuels
fuel
main
injector
pilot
injects
five
fifteen
percent
total
timings
20
degree
180
btdc
depending
quantity
injected
speed
load
directed
centerline
cylinder
angle
top
piston
avoiding
walls
stratification
reduce
fuel-air
mixing
rate
prevent
loss
quench
zones
mixture
becoming
lean
effective
embodiment
single
approximately
48
below
head
main fuel
fuel injector
diesel engine
air mixture
fuel-air mixture
pilot fuel
diesel fuel
direct injection
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