 |
|
  |
 |
|
  |
| HIDI, Hyundai Motor Company's direct injection gasoline engine, precisely controls fuel injection electronically;
drastically reduces fuel consumption using variation devices; and improves engine performance. Through the development of the HIDI engine,
Hyundai Motor Company is actively responding to environmental concerns that are increasingly drawing global attention. |
 |
 |
Stratification
In the combustion chamber, fuel and air are mixed in a proportion that enables combustion to take place in the combustion area.
At positions farther from the combustion area, the percentage of air is higher than in the combustion area.
This "stratification" produces differentiations in the ratios of air to fuel based on their relative location to the combustion area. |
 |
Expectation effect
Existing engines distribute fuel evenly to the whole combustion chamber. In HIDI engines, however, the fuel-air mixture achieves
combustion proportions near the ignition plug. These proportions are achieved via electronically controlled fuel injection and precise air
flow control, which also increases the percentage of air in the fuel-air mixture in other areas of the combustion chamber.
Improved fuel efficiency can be achieved through this stratification. |
|
 |
 |
Uniform combustion
Uniform combustion occurs in driving situations in which the vehicle needs high output such as when going up a hill or
passing another vehicle. At the initial stage of fuel injection intake, a uniform fuel-air mixture is produced, which causes
uniform combustion as in general gasoline engines. |
Expectation effect
Stratified charge combustion is used in driving situations such as city driving. Fuel is injected immediately prior to ignition
and is mixed with air near the ignition plug in proportions suitable for a smooth start. But, ultra-lean combustion takes
place in other areas. Thus, much better fuel efficiency is possible than with existing gasoline engines. |
|
|
 |
 |
HIDI Engine
With its optimal design of the intake port, combustion chamber, piston, and fuel injection point and with the precise control of
fuel amounts and injection timing, this HIDI engine enables ultra-lean combustion with an air-fuel ratio of more than 50:1.
With the application of a flow strengthening device and a modified piston, stable combustion is possible in the intake
port under the condition of stratification. ; |
 |
Fuel injection system with precise control capability
With the adoption of a precisely controlled fuel injection system, HIDI engines enable optimal combustion under any driving
conditions. The fuel injection system employs an electronically controlled high-pressure injector, in addition to a regulator
that helps maintain optimal fuel pressure. |
|
|
|
|