Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1990-07-13
1991-07-30
Miller, Carl Stuart
Internal-combustion engines
Charge forming device
Fuel injection system
123514, 123457, F02M 3704
Patent
active
050352237
ABSTRACT:
A fuel injection system has a fuel injector provided for injecting fuel directly in a cylinder of an engine and a fuel pump for supplying the fuel to the fuel injector passing through a fuel supply passage. Two fuel return passages are provided for communicating the fuel supply passage with a fuel tank. A high pressure relief valve is provided in one of the fuel return passages and a low pressure relief valve is provided in the other fuel return passage. A changeover valve is provided for selectively connecting the fuel supply passage with one of the fuel return passages in accordance with load on the engine, thereby providing a high fuel pressure or a low fuel pressure in the fuel supply passage.
REFERENCES:
patent: 3568646 (1971-03-01), Wehde
patent: 3844263 (1974-10-01), Endo
patent: 3910241 (1975-10-01), Fujisawa
patent: 3949713 (1976-04-01), Rivere
patent: 4459964 (1984-07-01), Straubel
patent: 4485788 (1984-12-01), Hofbauer
patent: 4539956 (1985-09-01), Hengel
patent: 4635606 (1987-01-01), Koike
patent: 4683864 (1987-08-01), Bucci
patent: 4800859 (1989-01-01), Sagisaka
Farber Martin A.
Fuji Jukogyo Kabushiki Kaisha
Miller Carl Stuart
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