Mazda 2007 CX-9, Service Highlights

Page: 85 / 614

EMISSION SYSTEM [MZI-3.5]
01-16–5
01-16
CATALYTIC CONVERTER SYSTEM STRUCTURE [MZI-3.5]
id0116d1101500
•
Consists of a three way catalytic converter and insulator.
•
A catalytic converter utilizing a platinum—palladium—rhodium system has been adopted.
System diagram
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CATALYTIC CONVERTER SYSTEM OPERATION [MZI-3.5]
id0116d1101600
•
Contaminants in the exhaust gas (HC, CO, NO
X
) are purified by oxidization and deoxidization while passing
through the catalytic converter.
—
Oxidization process
•
Noxious HC (hydrocarbon) and CO (carbon monoxide) are bonded to oxygen which is converted to
non-noxious carbon dioxide and water.
O
2
+ HC + CO
→
CO
2
+ H
2
O
—
Deoxidization process
•
Noxious NO
X
(nitrogen oxide) is converted to non-noxious nitrogen and oxygen. A part of the oxygen
generated at this time is used in the oxidization process.
NO
X
→
N
2
+ O
2
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NG: EVAP CONTROL SYSTEM
EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM OUTLINE [MZI-3.5]
id0116d1100800
Features
•
With the adoption of the charcoal canister, release of evaporative gas into the atmosphere has been prevented.
•
A duty solenoid valve (purge control valve) has been adopted for optimum control according to engine
operation conditions.
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: TO PCM
WU-TWC (RH) WU-TWC (LH)
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