Catalytic Converter System Structure [Mzi-3.5]; Catalytic Converter System Operation [Mzi-3.5]; Evaporative Emission (Evap) Control System Outline [Mzi-3.5]; Features - Mazda CX-9 2007 Service Highlights

CATALYTIC CONVERTER SYSTEM STRUCTURE [MZI-3.5]

• Consists of a three way catalytic converter and insulator.
• A catalytic converter utilizing a platinum—palladium—rhodium system has been adopted.
System diagram
WU-TWC (LH)
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CATALYTIC CONVERTER SYSTEM OPERATION [MZI-3.5]

• Contaminants in the exhaust gas (HC, CO, NO
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.
+ HC + CO → CO
O
2
— Deoxidization process
• Noxious NO
(nitrogen oxide) is converted to non-noxious nitrogen and oxygen. A part of the oxygen
X
generated at this time is used in the oxidization process.
→ N
NO + O
X 2
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NG: EVAP CONTROL SYSTEM

EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM OUTLINE [MZI-3.5]

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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EMISSION SYSTEM [MZI-3.5]
) are purified by oxidization and deoxidization while passing
X
+ H O
2 2
2
: TO PCM
WU-TWC (RH)
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