KiSC issued 09, 2007 A

(A)
Pressurization of Fuel
(b)
(a)
(c)
(d)
(f )
(e)
Fig.
1
Fig.
2
How it works:
1
)
When the pl u nger is at the bottom of its stroke, f uel from
the f uel cha mber enters the del ivery chamber through the
f eed hole
(
F ig.
1)
2)
As the ca mshaf t rotates, pl u nger moves u pward, the
stroke of
f
uel pressu ri zation begi ns.
(
Fig.
2)
3)
As the pl u nger moves u p, the pressu re
i
ncreases u nti
l
it
opens the del ivery va
l
ue a nd sends the pressu ri zed f uel to
i
nject ion nozzle th rough the
i
njection pi pe.
(
Fig. 3)
4)
Send
i
ng of
f
uel stops as soon as the control groove meets
the
f
eed hol e. Fuel
f
l
ows out th rough the
pl u
nger's center
hol e, control groove and feed hole, then backs to the
f
uel
cha m ber. As
a
resu lt, the pressu re fa
l
ls
a nd the stroke is
com pleted.
(
F
i
g.
4)
0011F044
Fig.
3
Fig.
4
(A)
Pressurization of fuel
(a)
Delivery Chamber
(b)
Delivery Valve
(c)
Feed Hole
(d)
Fuel Chamber
(e)
Plunger
(f )
Control Groove
(A)
Injection Control
Fig.
1
Fig.
2
t
(e)
Quantity control of fuel injection
1)
No fuel
The f eed hole meets the control-groove before bei ng cl osed
by the pl u nger top. Th erefore, no f uel is pressu ri zed a nd
i
njected. ( Fig. 1)
2)
Partial fuel
Pl u nger rotates a certa
i
n a mou nt when the control rack is
moved
i
n the direction of the a r row. Ef
f
ective stroke
A
mea ns the d ista nce wh ich the
f
eed hole is closed by the pl u n-
ger before meeti ng the control groove on th e pl u nger. There-
fore,
f
uel is
i
njected as mu ch as the amou nt of effective
stroke. (Fig.
2)
3)
Maxim u m
fuel
As the control rack moves the greatest possi ble a mou nt
i
n
the d
i
rection of the a rrow, the eff ective stroke A is max i-
mu m a nd the ma x
i
m u m a mou nt of f uel is
i
njected.( Fig. 3)
I
To Next Page
Loading...
Need help?
General
