| VELOSTER(FS) >2013 > G 1.6 T-GDI > Emission Control System > Exhaust Emission Control System>Description and Operation |
|
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 items have been
integrated into a highly effective system which controls exhaust emissions
while maintaining good drivability and fuel economy.
Air/Fuel Mixture Control System [Gasoline
Direct Injection (GDI) System]
The GDI system uses
signals from the heated oxygen sensor to activate and control the injector
installed in the manifold for each cylinder, thus precisely regulating the
air/fuel mixture 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 catalyst. The three way catalyst is designed to convert the
three pollutants [hydrocarbons (HC), carbon monoxide (CO), and oxides of
nitrogen (NOx)] into harmless substances. There are two operating modes in
the GDI system.
|