Reduce initial feed rate injector with fuel storage chamber
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United States of America Patent
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Mar 26, 2002
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N/A
app pub date -
Mar 14, 2000
filing date -
Mar 14, 2000
priority date (Note) -
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Abstract
A diesel injector is provided with a variable-volume flow-subtraction chamber containing a spring-loaded flow-subtraction piston. The chamber is connected to the pump chamber or related lines by passages that include a flow-subtraction control orifice. A space behind the piston is vented to fuel supply ducting that is associated with the system. A flow-subtraction control orifice controls the subtractive flow of fluid into the flow-subtraction chamber in predefined proportion to the flow of fluid through the combined nozzle orifices, such proportion being that between the cross-sectional area of the control orifice and the combined cross-sectional areas of the nozzle orifices. Such proportion of flow is maintained until the subtractive flow ends as the piston reaches a stop at its fully open position, whereupon the reduced-rate-of-injection phase ends and the main injection phase then occurs. During each cycle of operation, injection is monolithic or continuous throughout reduced-rate-of-injection and main injection phases, and at varying engine loads and speeds.
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