Chapter
3
Fuel Injection Equipment
1. Fuel
Supply
System
4LHA Series
1-6 Function of Governor
(1) Function of governor
The following is a representation of the movement
characteristics of the control rack at respective
speeds
rising from 0,
with
the governor control
lever at the maximum speed position.
Max.
control lever position
Low-idle control lever position
0
Cam
speed
A-B:
Fuel
volume condition during starting. Volume is
controlled by
excess
fuel spring.
B-C:
The rack moves to decrease injection after the
engine starts and the speed increases, (as the load
of the
excess
fuel spring is overcome by the
centrifugal force of the governor weight).
C
D: High torque at low speeds is obtained by increas-
ing the fuel injection volume in keeping
with
the
angleich stroke.
D-E:The
condition when the
thrust
force exceeds the
force of the angleich spring on the bottom of the
tension lever. This gradually pushes the rack to
lower fuel injection as the engine speed increases.
E-F:
The condition when both the
right
and
left
ends
of the shifter come in contact
with
the sleeve and
the bottom of the tension lever, and the control
rack is held in the normal position by the stopper,
(max. injection volume position on models not
equipped
with
an angleich spring).
F:
The point at which the governor spring starts to
take effect. This is the rated
output
of the engine.
F':
The point at which the governor starts to take
effect on models
with
a torque spring.
G:
Continuous rating point (usually 85-90% injec-
tion
volume of F point).
H:
No load max. speed
L: Low-idle position
(2) Starting control
Moving the control lever to the max. speed
posi-
tion
pulls the governor spring, and moves the
tension lever
until
it comes in contact
with
the
control stopper. When this is done, the
excess
fuel
spring located between the tension lever and
governor lever holds the control rack at the max.
starting injection volume position R
A-a.
After the engine is started, the
excess
fuel spring is
compressed
as the centrifugal force of the governor
weight overcomes the set load of the
excess
fuel
spring.
As the speed exceeds Nb, the speed changes
from B to C' (on models
with
an angleich spring)
or B to C (on models
without
an angleich spring).
The rack reaches the position of Rc, at which the
governor lever and tension lever are interlocked.
R
A-B
Control lever positionjff^a
Rated
speed settii
Full
load stopper
Tension
lever
Angleich
spring assembly
Injection
volume
Increase Decrease
Excess
fuel spring
Shifter
E
"
E
_
to
c
o
"F
nb
(models
with
angleich spring)
/_
nc
Cam
speed
C'
3-2-11
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