[자동차공학] HCCI
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- 2006.02.03 / 2019.12.24
- 35페이지 / ppt (파워포인트 2003)
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추천 연관자료
- 목차
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What is HCCI?
HCCI process
Advantage of HCCI
Challenges of HCCI
Future of HCCI
- 본문내용
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HCCI is Homogeneous Charge Compression Ignition
HCCI engine concept combines aspects of SI and Diesel engines by compression igniting a pre-mixture of fuel and air.
No flame propagation or mixing controlled combustion – global auto-ignition of the charge .
Can use uniformly ultra-lean mixtures, giving low peak combustion temperatures, near zero NOx emissions.
Auto-ignition is said to occur simultaneously at many locations, called hot spots, throughout the cylinder.
The most common means used to facilitate auto-ignition (for a high RON fuel) are:
Increasing the compression ratio.
Using intake air heating.
Using internal EGR by trapping combustion products by some method that can alter valve timing and/or lift (e.g. VVT, valvetronic, EVC).
Running the engine on fuel mixtures with different reactivities and controlling the fraction of each fuel.
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