Hyundai Santa Fe: 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 [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.
|
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)...
Other information:
Removal
External Amplifier
1.
Disconnect the negative (-) battery terminal.
2.
Remove the passenger seat assembly.
(Refer to Body - "Front Seat Assembly")
3...
Description
Continuous Variable Valve Timing (CVVT) system advances or retards the valve
timing of the intake and exhaust valve in accordance with the ECM control signal
which is calculated by the engine speed and load.
By controlling CVVT, the valve over-lap or under-lap occurs, which makes better
fuel economy and reduces exhaust gases (NOx, HC) and improves engine performance
through reduction of pumping loss, internal EGR effect, improvement of combustion
stability, improvement of volumetric efficiency, and increase of expansion work...
Categories
1. Driver’s front air bag
2. Passenger’s front air bag
3. Side air bag
4. Curtain air bag
The vehicles are equipped with a Supplemental Air Bag System for the driver’s
seat and front passenger’s seats.
The front air bags are designed to supplement the three-point seat belts. For
these air bags to provide protection, the seat belts must be worn at all times when
driving.
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