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Title: Staged direct injection diesel engine

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.
Authors:
 [1]
  1. (San Antonio, TX)
Publication Date:
OSTI Identifier:
865610
Report Number(s):
US 4543930
DOE Contract Number:
AC04-76
Resource Type:
Patent
Research Org:
Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA
Country of Publication:
United States
Language:
English
Subject:
staged; direct; injection; diesel; engine; diesel; engine; staged; injection; cetane; fuels; diesel; fuel; engine; main; fuel; injector; pilot; fuel; injector; pilot; main; fuel; fuel; pilot; injector; injects; five; fifteen; percent; total; fuel; timings; 20; degree; 180; degree; btdc; depending; quantity; pilot; fuel; injected; fuel; cetane; speed; load; pilot; fuel; injector; directed; centerline; diesel; cylinder; angle; top; piston; avoiding; walls; cylinder; stratification; injected; pilot; fuel; reduce; fuel-air; mixing; rate; prevent; loss; pilot; fuel; quench; zones; fuel-air; mixture; becoming; fuel; lean; effective; embodiment; pilot; fuel; injector; single; injection; fuel; directed; approximately; 48; degree; below; head; cylinder; main fuel; main fuel; fuel injector; fuel injector; fuel injector; fuel injector; diesel engine; diesel engine; air mixture; fuel-air mixture; pilot fuel; pilot fuel; pilot fuel; pilot fuel; pilot fuel; pilot fuel; diesel fuel; direct injection /123/