Hole type fuel injector and injection method

Internal-combustion engines – Charge forming device – Fuel injection system

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123496, 239464, F02M 4100

Patent

active

050205005

ABSTRACT:
A hole type fuel injector with a nozzle body and needle valve having cooperating inner and outer metering rings providing a metering passage (a) to provide an initial reduced rate of fuel injection during an initial increment of valve lift, (b) to maintain fuel pressure at the valve seat to reduce fuel dribble and cavitation erosion during a corresponding last increment of valve closure and (c) to prevent secondary fuel injection.

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