Kia Rio YB Quiz
Emission Control System

Exhaust Emission Control System

In this manual: Emission Control System
General Information — 8Maintenance — 31Engine Mechanical System — 44Engine Electrical System — 14Emission Control System — 9Engine Control System/Fuel System — 30Clutch System — 10Manual Transmission — 10Automatic Transmission — 23Drive Shaft and Axle — 8Suspension System — 15Steering — 9Restraints — 14Brake System — 22Body (Interior and Exterior) — 115Body Electrical System — 84Heating, Ventilation, and Air Conditioning — 28
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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 elements are 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 fuel 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 enable the use of a three-way catalyst. The three-way catalyst is designed to convert three pollutants: (1) hydrocarbons (HC), (2) carbon monoxide (CO) and (3) nitrogen oxides (NOx) into harmless substances. The MFI system has two operating 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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