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By combining a low-fuel-consumption, high-performance, low-noise, low-vibration direct-injection
diesel engine with up-to-date common rail system technology and turbo technology (WGT and  VGT) , Hyundai Motor Company is developing a green engine for
use in cars, RVs, and SUVs, that will dramatically reduce fuel consumption and CO2 emissions. |
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Traditional diesel engines simply force fuel into a combustion chamber via fuel injection pumps.
In the common rail injection system, however, fuel is pressurized in a high-pressure fuel pump before being forced into the
common rail. High-pressure fuel already stored in the common rail is injected into the cylinder via an ECU-controlled injector.
The engine ECU precisely controls and injects the appropriate amount of fuel at the appropriate time based on engine speed
and load. This results in more efficient combustion, reduced exhaust gas, and improved engine output. In addition,
ECU control of the electronic injector allows pilot injection and main injection to occur separately within a cycle, generating power
separately and thereby drastically reducing combustion noise at low speed. |
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 Operating Principles of VGT |
| Depending on the engine's operating conditions, optimal turbine power is attained via variable vane
devices connected to the vane control device, which changes the exhaust gas flow groove area and flow angle at the entrance of the turbine. |
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| Effect of VGT Application |
| Supercharging conditions suitable for ever-changing driving conditions can be created with the application of VGT:
supercharging can be maximized at low speeds and supercharging losses minimized at high speeds, thus improving
engine output by 10 to 15 percent. Other advantages include: |
- Improved acceleration
performance (10-15%) and improved acceleration
and deceleration responsiveness
- Improved fuel economy via efficient
supercharging (10-15%) |
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D-Engine |
A-Engine |
J-Engine |
| |
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| displacement |
1991
cc |
2497
cc |
2902
cc |
| combustion
method |
direct
injection |
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| intake
and exhaust method |
turbo
intercooler |
¬ |
¬ |
| turbocharger |
WGT
or VGT |
WGT |
WGT |
| fuel
injection device |
Common
Rail |
¬ |
¬ |
| number
of valves |
SOHC
16valve |
DOHC
16valve |
¬ |
| car
model applications |
Santa Fe, Trajet |
Starex, Sorento |
Terracan, Carnival |
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