Pneumatic governor control apparatus for engine fuel injection system

摘要

An engine driven air pump produces a vacuum having a magnitude or level which increases with engine speed. The air pump is connected to a pneumatic governor which varies the volume of fuel injected into the engine by a fuel injection pump in accordance with the level of vacuum. A control valve variably communicates the inlet of the governor with the atmosphere to control the level of vacuum. A high speed valve connected in series with the control valve progressively closes when the engine speed exceeds a predetermined maximum value. A shut-off valve connected in series with the control valve closes when an engine on-off switch is turned off.