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(11) | EP 0 054 482 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Distributor pump |
| (57) A fuel injection system for a diesel engine having injection and metering modes of
operation for delivering fuel to an engine comprising a plurality of fuel injectors
(40) wherein each of said fuel injectors comprise a first port (45), a second port
(47) and a metering chamber (186) for storing a premetered quantity of fuel, during
the metering mode of operation, prior to the injection of said premetered quantity
of fuel into the engine during the injection mode of operation. The system further
includes manifold means (48) for connecting in fluid communication each of second
ports of each of said fuel injector, pressure regulating means (50, 52) connected
between said manifold means and a fuel reservoir (34) for regulating and for supplying
fuel at said second determinable pressure to said second inlet port of each of the
injectors and distributor pump means (30) connected to the said first port of each
of said fuel injectors and to the fuel reservoir for sequentially pressurizing the
first port of a particular injector at a pressure greater than the pressure established
by the pressure regulating means causing the piston to stabilize at the bottom of
its stroke and sequentially thereafter lowering said first pressure level to a pressure
lower than that of the pressure established by said pressure regulating means thereby
causing said piston to move causing said premetered quantity of fuel to enter said
metering chamber of a particular one of said injectors through said second port and
for sequentially thereafter increasing said first pressure level thereby causing said
piston to pressurize the fuel within said metering chamber to initiate fuel injection
into the engine through a nozzle. |