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US 5,199,641 AGranted
Fuel injection nozzle with controllable fuel jet characteristic
AssigneeSiemens Aktiengesellschaft
InventorsDietmar Hohm, Peter Kleinschmidt, Hans Meixner, Dieter Stein
Life of this patent
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Abstract
A fuel injection nozzle for a combustion engine not only has a valve for alternately opening and closing the nozzle, but also has a part which undergoes alternating stroke movement, either longitudinally or transversely. The alternating stroke movement changes the opening angle of the nozzle opening. The alternating stroke movement is in a frequency range of approximately 5 to 20 kiloHertz.
Claims11
A fuel injection nozzle for combustion engines, comprising:
- a nozzle bore arranged in a nozzle part,
- a nozzle needle within the nozzle part,
- a drive connected to the nozzle needle, said drive having an electrical input for receiving an electrical input variable to cause the nozzle needle to be moved into a closing position, in which said nozzle needle closes the nozzle bore, and alternately into an open position, in which said nozzle needle frees the nozzle bore, and
- means for imparting, during the open position of the nozzle needle, an alternating stroke movement to at least one of said nozzle part and said nozzle needle which is situated in a region of formation of an injection jet, said means for imparting being excitable by a further electrical input variable and being designed structurally in such a way that a period for the alternating stroke movement is many times smaller than a predetermined minimum opening time of the injection nozzle, said means for imparting imparts the alternating stroke movements with a period which corresponds to an excitation frequency of between 5 kHz and 20 kHz, and said means for imparting alters an opening angle of the injection jet of the injection nozzle under control of the further electrical input variable.
1 more element
Dependencies are inferred from the claim text.