Diesel engine fuel injection system with a rate-of-injection con

Details Diesel engine fuel injection system with a rate-of-injection con Diesel engine fuel injection system with a rate-of-injection con

1986-06-25

1988-03-15

Miller, Carl Stuart

Internal-combustion engines

Combustion chamber means having fuel injection only

Using multiple injectors or injections

123447, 123506, 123496, F02M 3900

Patent

active

047305851

ABSTRACT:
A fuel injection system comprising a fuel injection pump, at least one fuel injection nozzle connected thereto, and a control device for varying the rate of injection of the system according to varying engine parameters. The control device has a variable volume chamber, the volume of which is varied by a piston located by a piezoelectric actuator. The variable volume chamber and a pumping chamber of the pump is intermittently connected by a passage which is specifically designed in such a manner that the fluid communication between the chambers, during the delivery stroke of a pump plunger, is provided only for an initial stage of the delivery stroke. A rate of injection is controlled in the initial stage to perform a pilot injection. In the subsequent stage, in which there is no need for rate-of-injection control, the variable volume chamber is isolated from the pumping chamber in order to relieve the piezoelectric actuator from an excessively high fuel pressure that would cause degradation of the piezoelectric elements.

REFERENCES:
patent: 3759239 (1973-09-01), Regneault
patent: 4579096 (1986-04-01), Kobayashi
patent: 4586480 (1986-05-01), Kobayashi

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