Hyundai Sonata: 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 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 [Multiport Fuel Injection (MFI) System]
The MFI 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 MFI system.
| 1. |
Open Loop air/fuel ratio is controlled by information pre-programmed
into the ECM.
|
| 2. |
Closed Loop air/fuel ratio is constantly adjusted by the ECM based
on information supplied by the oxygen sensor.
|
Catalytic Converter. Description and Operation
Description
The catalytic converter of the gasoline engine is a three way catalyst.
It oxidizes carbon monoxide and hydrocarbons (HC), and separates oxygen from
the oxides of nitrogen (NOx). ...
See also:
Summer tires
HYUNDAI specifies summer tires on some models to provide superior performance
on dry roads. Summer tire performance is substantially reduced in snow and ice.
Summer tires do not have the tire trac ...
Cylinder Head. Components and Components Location
Components
1. Camshaft bearing cap
2. Camshaft front bearing cap
3. Exhaust camshaft
4. Intake camshaft
5. Exhaust CVVT assembly
6. Intake CVVT assembly
7 ...
Defogging logic
To reduce the probability of fogging up the inside of the windshield, the air
intake is controlled automatically according to certain conditions such as
or
position. To cancel or return the
de ...