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Throttle
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This article is about the control of engine power. For other uses, see
Throttle (disambiguation).
A throttle is the mechanism by which the flow of a fluid is managed by
constriction or
obstruction. An
engine's power can be increased or decreased by the restriction of inlet gases (i.e., by the use of a throttle), but usually decreased. The term throttle has come to refer, informally and incorrectly, to any mechanism by which the power or speed of an engine is regulated. What is often termed a throttle (in an aviation context) is more correctly called a
thrust lever. For a
steam engine, the steam valve that sets the engine speed/power is often known as a regulator.
Contents
Internal combustion engines
A cross-section view of a throttle valve
In a
gasoline internal combustion engine, the throttle is a valve that directly regulates the amount of air entering the engine, indirectly controlling the charge (fuel + air) burned on each cycle due to the
fuel-injector or
carburetor maintaining a relatively constant fuel/air ratio. In a motor vehicle the control used by the driver to regulate power is sometimes called the
throttle pedal or accelerator.
The throttle is typically a
butterfly valve. In a
fuel-injected engine, the throttle valve is placed on the entrance of the
intake manifold, or housed in the
throttle body. In a carbureted eng...
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