Kia Optima DL3 Quiz
Emission Control System

Exhaust Emission Control System

In this manual: Emission Control System
General Information — 8Advanced Driver Assistance System (ADAS) — 21Maintenance — 27Engine Mechanical System — 45Engine Electrical System — 11Emission Control System — 11Engine Control System/Fuel System — 25Automatic Transmission — 20Drive Shaft and Axle — 7Suspension System — 22Steering — 7Restraints — 11Brake System — 22Body (Interior and Exterior) — 116Body Electrical System — 90Heating, Ventilation, and Air Conditioning — 32
2steps
~12min
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Description and Operation

Description

Exhaust emissions (CO, HC, NOx) are controlled by a combination of engine modifications and the addition of special control components.

Modifications to the combustion chamber, intake manifold, camshaft, and ignition system form the basic control system.

These components have been integrated into a highly efficient system that controls exhaust emissions while maintaining good drivability and fuel economy.

Air-Fuel Ratio Control System [Multi-Point Fuel Injection (MFI) System]

The MFI system uses signals from the heated oxygen sensor to activate and control the injector installed in the intake manifold for each cylinder, thereby accurately regulating the air-fuel ratio and reducing emissions.

This, in turn, allows the engine to produce exhaust gas of the proper composition to permit the use of a three-way catalytic converter. The three-way catalytic converter is designed to convert three pollutants [hydrocarbons (HC), carbon monoxide (CO) and nitrogen oxides (NOx)] into harmless substances. The MFI system operates in two modes.

  1. The open-loop air-fuel ratio is controlled by information programmed into the ECM.

  2. The closed-loop air-fuel ratio is controlled by the ECM based on information received from the oxygen sensor.

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