User Manual

Chapter 4
BOSCH HDI EDC 15C2 INJECTION SYSTEM AND PARTICLE FILTER
23
The turbocharger consists of the following components:
• a chamber linked to the engine exhaust function,
• a chamber linked to the inlet function,
• a turbine and a compressor, joined together by a shaft.
The turbine, driven by the exhaust gases, drives the compressor which
compresses the inlet air.
The movement of the piston (12) allows the inlet cross section of the exhaust
turbine to be varied in order to alter the speed of the exhaust gases.
The regulation electrovalve controls the turbocharging pressure regulator piston
(12).
The turbocharging pressure is regulated progressively and is controlled by a
cartographic map (injection ECU).
Note: Lubrication of the turbocharger: careful lubrication is required due to
the very high speeds of the moving parts and the high temperatures to
be dissipated.
The pressurised oil required for this function is taken from the engine's oil circuit.
IMPORTANT: Before switching off the engine, it is essential to let the engine
return to idle speed. Failure to comply with this condition will
eventually destroy the turbocharger (due to lack of lubrication).
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