62
TS 500i
7.
STIHL Injection
In this chapter the components are
shown without the shroud and tank
housing for a better view.
STIHL Injection basically consists of
a control unit (1), throttle shuttle
housing (2), injection valve (3),
injection pump (4), sensor (5),
generator (6) and flywheel (7).
The control unit (1) is responsible
for central control of all engine
functions and contains an ignition
module with high ignition energy.
1307RA255 TG
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5
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2
6
4
3
7
8
The control unit (1) is powered with
voltage generated by the magnet
ring on the flywheel (7) and the
generator (6). In addition, the
generator (6) provides the speed
signal and the position of the
crankshaft to the control unit (1).
This information is required to
determine the ignition timing and
the injection timing.
The throttle shutter (8) in the throttle
shutter housing (2) is actuated via
the throttle cable, thus regulating
the inflow of air. The sensor (5)
provides the pressure and
temperature in the crankcase to the
control unit (1), which, on this basis,
determines the air mass introduced
and ultimately the required amount
of fuel from the characteristic curve.
This amount of fuel is injected into
the crankcase via the injection
valve (3).
The injection pump (1) maintains a
constant pressure for the injection
valve (2) and ensures the
necessary fuel delivery (impulse). In
addition, the manual fuel pump (3)
is integrated in the injection
pump (1).
The pickup body (4) with magnetic
separator (5) eliminates tiny
metallic particles and protects the
injection valve (2).
Troubleshooting and test
procedures are described in the
following chapters, Testing,
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3
1
5
4
Summary of Contents for TS 500i
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