Pintle velocity determination in a solenoid fuel injector and control method
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United States of America Patent
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Apr 11, 2017
Grant Date -
Feb 12, 2015
app pub date -
Sep 20, 2012
filing date -
Sep 30, 2011
priority date (Note) -
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Abstract
A method is provided for determining the velocity of a pintle assembly in a solenoid fuel injector during a closing stroke of the pintle assembly, such that a braking step is performed during the closing stroke, which includes operating an injector driver with a current regulator to establish a braking current in the solenoid coil. The velocity of the pintle assembly is derived from the duty-cycle of the current regulator during the braking step. A method of operating a solenoid fuel injector, in particular for gaseous fuel, using the so-determined pintle velocity is also provided.
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