Quantity Control Of Fuel Injection - Kubota D1102-B Workshop Manual

(A) Pressurization of Fuel
(b)
(c)
(a)
(d)
(f )
(e)
1
Fig.
3
Fig.
0011F044
(A) Injection Control
1
Fig.
2
Fig.
I
Fig. 4
2
Fig.
t
(e)
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)
As the ca mshaf t rotates, pl u nger moves u pward, the
2)
stroke of f uel pressu ri zation begi ns. ( Fig.
As the pl u nger moves u p, the pressu re i ncreases u nti l it
3)
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.
Send i ng of f uel stops as soon as the control groove meets
4)
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
a
cha m ber. As resu lt, the pressu re fa l ls a nd the stroke is
com pleted. ( F i g.
4)
(A) Pressurization of fuel
(a) Delivery Chamber
(b) Delivery Valve
Feed Hole
(c)
(d) Fuel Chamber
(e) Plunger
Control Groove
(f )

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
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)
Maxim u m fuel
3)
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)
2)
3)
A
KiSC issued 09, 2007 A