Hydraulically-actuated electronically-controlled unit injector fuel system having variable control of actuating fluid pressure
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United States of America Patent
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Mar 9, 1993
Grant Date -
N/A
app pub date -
Oct 11, 1991
filing date -
Oct 11, 1991
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A hydraulically-actuated electronically-controlled unit injector fuel system and method of operation is disclosed. The fuel system comprises at least one hydraulically-actuated electronically-controlled unit injector and apparatus for supplying hydraulically actuating fluid to the inejctor. The fuel system also includes apparatus for detecting the pressure of the hydraulically actuating fluid supplied to the injector and for generating a presure indicative signal indicative of the pressure detected. The fuel system further includes apparatus for controlling the pressure of the hydraulically actuating fluid supplied to the injector and for correcting the pressure amount based on the pressure indicative signal. The present invention provides closed-loop control of actuating fluid pressure which helps ensure that a desired variable pressure setting is achieved and maintained for as long as needed. Accurate control of the actuating fluid pressure helps ensure accurate control of fuel injection timing and quantity.
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