Fuel Pressure-feed
1.
Bottom dead center of plunger:
At bottom dead center, fuel enters the delivery chamber through the fuel chamber and the
feed hole. (Fuel chamber is always kept full by the fuel pump.)
2.
Pressure-feed start
3.
Pressure-feed process:
Plunger is pushed up by camshaft to close the feed hole, and fuel pressurization starts.
As
the plunger moves
up,
pressure increases, and delivery valve is opened. Then fuel is
pressure-fed through the injection pipe and nozzle into the combustion chamber.
4.
Completion of pressure-feed:
When plunger moves further
up,
the control groove and feed hole meet. Pressurized fuel
in the delivery chamber is returned through the plunger's center hole, control groove, and
feed hole
to
the fuel chamber. Then pressure falls and pressure-feed is completed.
Pressure-feed
Start
to
Completion
(1,---..._
11
2)
3)
4)
1.
Delivery Chamber
2. Delivery
Valve
3.
Feed Hole
4.
Fuel Chamber
5.
Plunger
63
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