Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1990-08-24
1991-08-27
Miller, Carl S.
Internal-combustion engines
Charge forming device
Fuel injection system
123198DB, 123500, 239 88, F02M 700
Patent
active
050424459
ABSTRACT:
An electronically controlled fuel supply system is provided for employing a plurality of fuel injectors which maximize SAC pressures under both low speed and high speed operating conditions and are capable of sustaining SAC pressures in excess of 30,000 psi. The fuel supply system of the present invention includes a gear pump which supplies pressure-modulated fuel to a fueling channel and to a timing channel and from there to a plurality of injectors. Fuel pressure regulator means and timing fluid pressure regulator means are provided in the fueling and timing channel, respectively. An electronic control unit receives information relating to engine operating conditions from a plurality of sensors and actuates the fuel pressure regulator means and the timing fluid pressure regulator means to adjust the pressure as required for the specific engine operating conditions. The timing fluid is delivered to the injectors by the present system at a pressure sufficient to sustain a hydraulic link within the injector of the length necessary to maintain high SAC pressures during injection. Several embodiments of a fuel supply system which achieves these objectives are disclosed. A mounting integral with the cylinder head for an electronically controlled injector fuel supply system is also provided.
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Perr Julius P.
Peters Lester L.
Smith Edward D.
Cummins Engine Company, Inc.
Miller Carl S.
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