Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1991-07-16
1993-06-01
Miller, Carl S.
Internal-combustion engines
Charge forming device
Fuel injection system
123387, F02M 4100
Patent
active
052150607
ABSTRACT:
A rotary distributor fuel injection pump having a fuel system for circulating fuel continuously from a fuel supply pump via an end chamber at one end of the distributor rotor and an annular fuel chamber surrounding the distributor rotor to a return line and a pressure regulator in the return line for regulating the upstream pressure and continuously returning excess fuel to the supply pump. An electrical control valve is selectively opened during the pumping strokes to spill fuel into the end chamber and terminate the fuel injection event. An auxiliary passage in the rotor resets the pressure in the distributor outlets to approximately the same initial pressure. In an air purging mode of operation, the control valve is held closed until after the distributor port moves out of registry with each distributor outlet to prevent back flow to the end chamber. A retraction shuttle valve in each distributor outlet employs a short closure spring which permits the retraction shuttle to float freely in an unloaded spring gap to equalize the upstream and downstream pressures.
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Kelly William W.
Klopfer Kenneth H.
Miller Carl S.
Stanadyne Automotive Corp.
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