Internal-combustion engines – Charge forming device – With fuel pump
Patent
1995-11-30
1997-09-09
Miller, Carl S.
Internal-combustion engines
Charge forming device
With fuel pump
123467, F02M 3704
Patent
active
056645457
ABSTRACT:
According to the present invention, a fuel injection apparatus includes a casing having a control pressure chamber for storing fuel supplied from fuel passage, a needle valve to which fuel stored in the control pressure chamber applies pressure in the valve closing direction, a valve device for interrupting communication between the fuel passage and the control pressure chamber to seal fuel in said control pressure chamber, and volume changing device for expanding volume of the control pressure chamber after fuel is sealed in the control pressure chamber by the valve device. According to the above fuel injection device, pressure in the control pressure chamber is reduced while the fuel is stored therein by the volume changing device, the nozzle needle is lifted, and injection is started. For this reason, it is not necessary to supply surplus fuel in addition to the injection fuel during the fuel injection. In this way, the fuel supply pump is made smaller in size, and efficiency for use of supplied fuel can be improved. Further, since high-pressure fuel is not discharged from the fuel injection apparatus, pulsation within the common rail can be suppressed, and fuel injection can be stabilized.
REFERENCES:
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patent: 4640252 (1987-02-01), Nakamura
patent: 4946106 (1990-08-01), Turchi
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Prescher, et al: "Common-Rail-Einspritzsysteme mit drehzahlunabhangiger charakterstik und hohem einspritzbruch-ein zukunftspotential fur den dieselmotor, IMH co. at the Vienna Motor Sumposium", Apr. 28, 1994, pp. 54-79.
Masahiko Miyaki et al, "Development of New Electronically Controlled Fuel Injection System ECD-U2 for Diesel Engines", SAE International Congress and Exposition, Feb. 25, 1991, Paper No. 910252.
Kato Masaaki
Okajima Masahiro
Miller Carl S.
Nippondenso Co. Ltd.
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