| A turbocharger
is used to feed air into the engine in
order to keep the air-fuel ratio at acceptable
levels and optimize the combustion. The
boost pressure is controlled by the main
STT Emtec electronic control unit (ECU),
operating a pulse width modulated valve.
The ECU is also controlling the amount
of exhaust gases to be re-circulated by
the EGR valve.
The control system is depending on
the engine load, speed and temperature.
The exhaust gases are cooled by an EGR
cooler to reduce the exhaust gas temperature
before it is mixed with the inlet air.
In addition an intercooler system is
added to increase the density of the
compressed inlet air.
A full technical description listing advantages of this system follows on pages 3, 4, 5 & 6. |
