Turbo Pressure Control - Chrysler 1991 Stealth Technical Information Manual

FUEL SYSTEM - Turbo Pressure Control <Turbo >
14-21
TURBO PRESSURE CONTROL <TURBO >
Tu rbo press ure used in the waste gate actuator is
control led by duty control of the wast a gate
correspond ing to dr iving cond iti ons can
be
obtained.
solenoid valve. As a result ,
turb(O r ;P, " ~' ~ ' ; O ~ ' ; 'O;:==============:;1
Engine
cootrol
unil
Inl" roool ..
W;th
"""'t"
gate Mleooid valv"
normally
00 {duty tOO%1
r' - -L.
,
' "
,I ,--- _
1/
r ------
!.
W;th
""""t"
o ote soIe roi<l
~. lvf:
norma lly off
Iduty
0')1,)
Eogino rpm
7PU-.o
In t . fO~
W. "'e \jIIte
aoluotor
The engine control unit tu rns the power transistor in the unit
on arid. when norma l current (d uty 100%) flows in
the
waste
gate soleooid
~a lve
coil, the waste gate so leflOid valve does
not open
if
turbo pressure does not rise above ttle set
pressure of the waste gate actuator spring sillCe some of the
turbo pressule used in the waste gate actuator leaks oot.
On the other harJd. 'When current does flOl flow in the waste
~ata solenoid va lve coil (duty
O%L
the w~sta gate valve
opens
if
turbo pressu re rises to the set pressu re of the waste
gate <lCtuator spring sin ce flO pressure l ea~s
001.
Consequently. by using dUly control for th tJ waste gata
Solenoid valve. turbo pressure ca n be controlled in a range
from 0% to 100% duty.
Th is duty control is performed in cyc les of approximately
6Oms.