35
Superior
Technology
Engine electronic systems
Start of injection valve
The start of injection valve is positioned on the
underside in the housing of the distributor-type
injection pump. The inner chamber pressure of
the pump acts on the injection control piston via
this cyclically clocked solenoid valve.
Functional description
The start of injection is controlled depending on
the clock pulse (pulse duty factor) of the start of
injection valve. The engine control unit can adjust
infinitely variable between retarded start of
injection (fully open) and advanced start of
injection (fully closed).
Activation takes place by means of a ground
pulse from the engine control unit.
Substitute function
Control is no longer possible in the event of the
start of injection valve failing.
A fixed value is used.
Effect
The engine runs with reduced power output due
to the now limited volume of fuel.
Start of
injection valve
MSSP_001_030
Summary of Contents for SDI 55-5
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