Armature motion control method and apparatus for a fuel injector

Details Armature motion control method and apparatus for a fuel injector Armature motion control method and apparatus for a fuel injector

1996-07-26

1999-02-02

Morris, Lesley D.

Fluid sprinkling, spraying, and diffusing

Processes

Of fuel injection

2395851, 2395854, F16K 3108

Patent

active

058653716

ABSTRACT:
An injector needle/armature assembly stroke is controlled so as to minimize opening and closing impact forces. The controlled motion eliminates or significantly reduces the problems associated with valve bounce, providing less acoustic emission, reduced wear, improved spray characteristics and better flow regulation. The current applied to the electromagnetic coil of the injector in accordance with a modified injector timing pulse waveform serves to reduce impact velocities at each end of the armature stroke. The waveform can be optimized for a class of injectors with a pulse width modulated waveform, repeatedly re-energizing and de-energizing the electromagnetic coil in accordance with an optimized on/off pulse train.

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