Diesel engine fuel injection system

Details Diesel engine fuel injection system Diesel engine fuel injection system

1982-09-01

1984-08-07

Moy, Magdalen Y. C.

Internal-combustion engines

Charge forming device

Fuel injection system

123459, 123498, F02M 3900

Patent

active

044637276

ABSTRACT:
A Diesel engine distributor-type injection pump has a vane pump (3) providing fuel under pressure to an injection pump system formed by two pistons (17) pressed towards each other by a cam track (26) to provide fuel under injection pressure to fuel injection plug connectors (28, 29) when the radial position of a duct (27) in the bore of the rotating shaft (2) matches a connecting duct (28) of a respective injection outlet. To provide for precise timing of fuel being injected, pressurized fuel is drained under control of a slider valve (FIG. 1: 38, 39; FIG. 2: 72, 74) connected through a communicating duct (32, 42, 71) to the slider valve. The slider valve is operated by a piezoelectric positioning element (FIG. 1: 61; FIG. 2: 76) which moves the spool (74, 39) of the slider valve; in one embodiment (FIG. 1), the piezoelectric element operates a piston (53) having a substantially larger diameter than the end faces of the spool (39) to provide for excursion amplification; in another embodiment (FIGS. 2, 4-8), the piezoelectric elements are bending elements and thus provide for larger excursion.

REFERENCES:
patent: 3589345 (1971-06-01), Benson
patent: 3880131 (1975-04-01), Twaddell et al.
patent: 4180022 (1979-12-01), Khair et al.
patent: 4351283 (1982-09-01), Ament

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