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25-2
EMISSION CONTROL SYSTEMS
- General Information
g +
GENERAL INFORMATION
m- c:-
N25BEBAa
!eF+
The emission
control
system
has the
following
three
major
%ystems.
Es
-
(I) Crankcase
emlsslon
control
system
@s
(2) Evaporative
emission
control
system
Egg--
(3) Exhaust
emission
control
system
&&
The crankcase
emrsslon
control
system
IS
a system
adopting
a c,losed-type
crankcase
ventilation
to prevent
~~
S Es-
blow-by
gas from escaping
into the atmosphere.
The generated-gas
IS
Instead-led
to the combustion
chamber
s
r
for combustion,-
gg+
The evaporative
emlsslon
control
system
tor preventtng
loss ot tuel vapor
trom
the tuel system
to the
mu_
gE==
Et&
.-rttnosphere
consists
of various components
(a cantster,
purge control
valve, two-way
valve and so on) which
II
I~l~)llect and
lead venerated
fuel
vapor
to the
combustion
chamber
for combustton.
EiG
The exhaust
emlsslon
control
system
consists
ot an air-tuel
ratio control
system
(tCi
system),
three-way
Z
gp
I:.rltalytic converter,
exhaust
gas recrrculatlon
system,
secondary
atr supply
system
and so on to reduce
t!nllsstutIs
ut CO. HC and NOx.
Eel:
Electronicallv
Controlled
lnlectlon
!g
SPY
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