Engine
SHOP MANUAL
Ch 1 page 73
Injector Scania XPI
There is one injector for each cylinder. The injector is controlled
electrically by the engine control unit.
The injector operates in two phases. One phase is when no power
is supplied to the injector and it is closed. The other phase is
when power is supplied to the injector and it is open.
The injector consists of a piston, nozzle needle, spring and an
electromagnetically controlled fuel valve.
The fuel enters the injector via the connection. The injector is
continuously pressurised to a maximum of 2400 bar. When the
solenoid valve is supplied with power and opens, fuel is injected
into the cylinder.
Injection timing and the amount of fuel to be injected is deter-
mined by the engine control unit. Injection duration and the fuel
pressure in the accumulator determine the amount of fuel which is
injected into the cylinder.
Phase 1,
no power to the solenoid valve in
the injector
No power is supplied to the injector solenoid
valve and the injector is closed.
There is a fuel pressure of between 350
and a maximum of 2400 bar in the injector.
NOTE
Figure 134
To Next Page
Loading...