PERODUA KELISA 2001 Owner's Manual page 305

D
Emission control system
Environmental protection and Perodua
It is a matter of great importance and also
the duty of mankind to protect our atmos­
phere and environment against pollution
and leave it clean and unpolluted to poster­
ity. Perodua has long been directing its
technical efforts and resources toward ful­
filling this important requirement. As a re­
sult, Perodua has succeeded in developing
various emission control systems that will
minimize atmospheric pollution without sac­
rificing vehicle utility.
The emission control systems installed in
your vehicle comply with all the require­
ments of the relevant Australian Design
Rules as well as various other regulations.
Your role in controlling air pollution
To keep our air clean, you are responsible
for the proper operation, maintenance and
care of your vehicle in accordance with the
instructions contained in this manual. Do
not remove or modify the emission control
systems. Any maintenance work on the
emission control systems other than that
specified by Perodua should be avoided.
15-1
Sources of vehicle emission
There are three kinds of gases emitted by
the vehicle that pollute the atmosphere:
1. Crankcase emission (Blow-by gas)
This is the unburned gas in the cylinder that
leaks into the crankcase and is released
into the air intake hose and contains hydro­
carbons (HC).
2. Exhaust emission
This is the gas formed by the combustion of
the fuel inside the cylinder and discharged
into the atmosphere through the exhaust
pipe. It contains carbon monoxide (CO),
hydrocarbons (HC), and nitrogen oxides
(NOx).
3. Fuel evaporative emission
This is the gasoline vapor formed by vapori­
zation in the fuel tank, and contains hydro­
carbons (HC).
Fuel evaporative emission control
system
The fuel evaporative emission control sys­
tem functions for preventing fuel vapors
from escaping into the atmosphere. Fuel
vapor from the fuel tank is introduced into
the charcoal canister when the engine is
stopped, and then into the intake manifold
when the engine is running, by means of
negative pressure, for combustion.
Blow-by gas recirculating system
The blow-by gas recirculating system func­
tions for preventing blow-by gas from es­
caping into the atmosphere. Blow-by gas
from the crank case is returned to the com­
bustion chamber for recombustion.