• Redu ction in exh aust emissions as a result of an
improvement in the air supply of the engine.
• Increased power output as a result of th e higher
charge pressur e combin ed with a reduced exhaust
backpressure and thus im pr oved cha rge cycle.
OPERATION
The exha ust gases of the engine ar e directed
through t he exha ust ma nifold in to t he turbine hous-
ing onto the tu rbin e wheel (Fig. 2). The flow ener gy
of the exhau st gases cause t he tu rbin e wheel to
rotate. Consequen tly, the compr essor wheel, which is
connect ed th rough t he turbine shaft with the turbine
wheel, is driven at the sa me speed. Th e fr esh a ir
induct ed by th e compressor wheel is compressed and
pa ssed t o the engine (Fig. 2).
The charge pressure is contr olled by var yin g t he
position of the guide vanes (Fig. 2). The guide stu d of
the control linkage of the boost pr essu re actuat or
turns t he adjusting rin g in th e t urbine h ousing (Fig.
2). As a result, all the gu ide va nes whose guide studs
lik e wis e me s h into the ad jus ting ring, are als o
turned (Fig. 2).
At low speeds, the flow cross-section is redu ced by
closing th e guide van es (F ig. 2). Consequently th e
speed at which th e exhau st gas impa cts on the tur-
bine wheel is increased, as a resu lt of wh ich the
speed of t he turbocharger and th us the cha rge pres-
sure rises.
At h igh engine speeds t he guide vanes are increa s-
ingly opened an d t he flow cross-section is thu s
enla rged, as a r esu lt of which t he speed of th e tu rbo-
charger reduces a nd the charge pressure drops.
CH ARGE AI R COOLER AN D
PLU M BI N G
DESCRIPTION
The char ge a ir system consists of t he ch arge air
cooler an d ch arge air cooler piping.
The cha rge a ir cooler is a hea t excha nger t hat u ses
air flow from vehicle motion t o dissipate heat from
the i n take air. As the tu rbocha rger incr eases air
pr essu re, the air temperature incr eases. Lowering
the intake air tem perat ure increases en gine effi-
ciency an d power.
Fig. 2 TURBOCHARGER COMPONENTS
1 - COMPRESSOR HOUSING
2 - GUIDE VANE
3 - GUIDE STUD OF GUIDE VANE
4 - GUIDE STUD OF CONTROL LINKAGE
5 - CONTROL LINKAGE
6 - ADJUSTING RING
7 - TURBINE HOUSING
8 - BOOST PRESSURE CONTROL UNIT
1A - EXHAUST GASES TO TURBINE WHEEL
2A - TURBO INLET (FRESH AIR)
3A - TURBO OUTLET (COMPRESSED AIR)
4A - EXHAUST OUTLET
11 - 4 EX H AU S T S Y S T EM VA
To Next Page
Loading...
