Actuation fluid pump for a unit injector system
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United States of America Patent
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Oct 25, 1994
Grant Date -
N/A
app pub date -
Sep 29, 1993
filing date -
Sep 29, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A diesel engine hydraulically-actuated, electronically-controlled unit injector fuel injection system is provided with a two-stage pump system including two parallel pumps for supplying actuating fluid to the injectors. The first stage pump of this two-stage pump has a capacity which is adequate for most operating modes. The second stage pump is used for starting and for high engine load situations. The second stage pump is controlled by a solenoid bypass valve that switches in the second stage pump when the pressure in the high pressure rails fall below a desired or programmed level. An embodiment of this invention includes a second bypass circuit having a fast-response, solenoid-actuated bypass valve that bypasses all of the flow from both stages between injections and thereby produces a pulsed flow of actuation fluid to produce the required pressure for each engine fuel injection while unloading the pumping system between injections.
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