Internal-combustion engines – Combustion chamber means having fuel injection only – Using multiple injectors or injections
Patent
1987-10-08
1989-06-06
Dolinar, Andrew M.
Internal-combustion engines
Combustion chamber means having fuel injection only
Using multiple injectors or injections
F02B 312
Patent
active
048361615
ABSTRACT:
The invention relates to a direct fuel injection method for a diesel engine in which a preset quantity of fuel is introduced into a combustion space via a fuel injection nozzle in a preinjection and in a main injection which is separate from the preinjection. To achieve a short ignition delay with lowest possible specific fuel consumption during this process, the beginning of the preinjection occurs within the range of 10.degree.-16.degree. or of 20.degree.-30.degree. crank angle before top dead center, depending on speed, and the beginning of the main injection occurs within the range of 2.degree. after top dead center to 15.degree. before top dead center, the interval between the end of the preinjection and the beginning of the main injection being within the range of 3.degree. to 14.degree. or of 3.degree. to 26.degree. crank angle before top dead center and the preinjection quantity is 10% to 20% or 1% to 5% of the quantity of fuel preset in each case, depending on load.
REFERENCES:
patent: 2356627 (1944-08-01), Skakedoff
patent: 4543930 (1985-10-01), Baker
patent: 4704999 (1987-11-01), Hashikawa et al.
SAE Paper 929A, "Effects of Multiple Introduction of Fuel on Performance of a Compression Ignition Engine", Oct., 1964, by C. P. Gupta et al.
SAE Paper 929B, "The Effect of the Vigom Process on the Combustion in Diesel Engines", Oct., 1964, by P. Eyzat et al.
"What Can Be Gained by Pilot Injection?", Automotive Industries, pp. 533-534, Oct. 29, 1938 by P. H. Schweitzer.
"Pilot Injection Versus Cetane Numbers", Automotive Industries, pp. 60-62, Feb. 15, 1956, by G. Lozano and C. Vogt.
Abthoff Jorg
Fortnagel Manfred
Fricker Ludwig
Kramer Michael
Kuhn Michael
Daimler-Benz Aktiengesellschaft
Dolinar Andrew M.
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