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Emissions Controls
The
burning of gasoline
in
your car's
engine produces several byproducts.
Some
of
these are carbon monoxide
(CO), oxides of nitrogen (NOx) and
hydrocarbons (HC). Gasoline
evaporating from the tank also
produces hydrocarbons. Controlling
the production of
NOx,
CO,
and
HC
is important to the environment.
Under certain conditions of sunlight
and climate,
NOx and
HC
react to
form photochemical
"smog." Carbon
monoxide does not contribute to
smog creation, but it
is
a poisonous
gas.
250 Technical
Information
The
Clean
Air
Act
The
United States Clean Air Act*
sets standards for automobile
emissions.
It
also requires that
automobile manufacturers explain to
owners how their emissions controls
work and what to
do
to maintain
them. This section summarizes how
the emissions controls work.
Scheduled maintenance is on page
148.
* In Canada, Honda vehicles comply
with the
Canadian Motor Vehicle
Safety Standards
(CMVSS)
for
Emissions valid at the time they are
manufactured.
Crankcase
Emissions
Control
System
Your car has a Positive Crankcase
Ventilation System. This keeps
gasses that build up in
the
engine's
crankcase from going into the
atmosphere.
The
Positive Crankcase
Ventilation valve routes
them
from
the crankcase back to the intake
manifold.
They
are then drawn into
the engine and burned.
Evaporative
Emissions
Control
System
As gasoline evaporates
in
the fuel
tank, an evaporative emissions
control canister filled with charcoal
adsorbs the vapor.
It
is stored
in
this
canister while the engine is
off.
After
the engine is started and warmed up,
the vapor is drawn into the engine
and burned during driving.
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