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Internal Combustion Engine

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Internal Combustion Engine Chapter 8 Exhaust Flow Internal Combustion Engine Chapter 8 Exhaust Flow 4 Stroke Cycle Engine . – PowerPoint PPT presentation

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Title: Internal Combustion Engine


1
Internal Combustion Engine
  • Chapter 8
  • Exhaust Flow

2
Blowdown
4 Stroke Cycle Engine??? ????? ?? ?????. ????
??? ????? ??? ????. ?????? ???? ???? ???? ? ?????
????? ??? ???? Cam?? ????? ???? ??? ??? Stress
??? ??? ? ? ??. ??? ???? ???? ???? ? 40 ?? 60
???? ?? ??? ??? ????. ??? ??? ??? ?? ??? ??? ??
??? (3-4????) ??? ????? ?? ???. ? ???
Blowdown?? ??. ????? ?? ?? ??? ??? ?? ??? ????
?? ?? ?? ?? ???? ?? ??? ?? ?? ?? ??? ???? ????
??? ??? ????? ??? ?? ?????? ????? ??? ?
Negative Work? ????. ???? ????? ??? ??? ???
????? ??.
3
Exhaust Stroke
? ???? ??? ?? ??? ??? ??? ??? ?? ???? ?? ?? ???
?? ??. ???? ??? ? ??? ???? ??? ??? ???? ??????
???? ?????? ???? ????. ? ??? ??? ??? ?? ?? ???
??? ?? ??. ???? ??? ?? ????? ???? ?? ??? ????
??? ??? ?? ?? ?? ???? ???? ??? ??? ?? ?? ????
??? ??.
4
Blowdown
5
Backflow
? Fig. 8-2? Blowdown? Exhaust Stroke? ?? ??? ??
???? ?? ??. ?? ??? ?? ???? ???? ?? ?? ???. ??
??? ????? ??? ???? ??? ?? ??? ???? ??? ? ?? ???
?? ??? ???? ??? Negative Work? ????. ????? ???
??? ??? ????? ??? ??? ???? ??? ???? ? ??? ?? ??
?? ??. WOT? ???? Turbocharger? ???? ?? ???? ??
??? ??? ???? ???? ???? ????? ??? ?? ??? ???? ??
?? Backflow? ??. Backflow? ?? ??? ?? ????? ??
??? ?? ???? ? ???? ????? ??? ??? ??? ???? ???
???? ??? ??? ?? ???? ???? ??? ?? ?? ???? ???
???? Idle ?? ???? ??? ???? ??.
6
Valve Over Lap
? Fig. 8-2? Valve Over Lap??? ??? ??? Negative
Mass Flow? Backflow? ?? ???. ????? ??? ??? ?? ??
??? ??? ???? 2?? ??? ??. ????? ????? ?? ??? ??
????? ?? ??? ????. ??? ??? ???? ?? SI engine? ??
900?C ???? ?? ? ?? CI Engine? ????? ??? ?? ???
500?C ??? ?? ? ??. ?? ??? ?? ?? ????? ??? ???
???? ???? ????? ? ???? ?????? ????? ???? ????
???? ? ? ??. ? ?? ????? ?? ?? ?? ?? ??? ????
???? ?? ??? ??? Cylinder ?? ???? ?? ?? ??? ??
??? ? ?? ?? ??? ?? ?? ??? ???? ??? ???? ??. ??
?? ???????? ???? ???? ?? Exhaust Tuning?? ??.
7
Turbocharger
? ?? ???? ???? ?? Turbocharger? ????? ??. ?? ???
???? ???? Turbine? ?? rpm? ???? ??? Turbine? ?
?? ??? Compressor? ???? ??? ?????. SI Engine???
???? ??? ???? ??? CI engine??? ?? ??? ???? CI
engine?? ?? ???.
8
EGR
? ??? ???? NOx ??? ??? ?? ???(EGR)? ??? ??. ????
??? ???? ???? ?? ??? ?? ??? ??? NOx? ??? ?????.
??? ?????? ?? SI engine?? ????? ????? ?? ???
10-20?? ?????. SI engine ?? ?? ???? ?? ????
Muffler? ??? CI engine?? ????? ?? ??? ???? ?? ??
???? ?? muffler? ?? ?? ??? ????. ???? ???? ???
?? CI engine?? ?? ?? ?? ???? ??.
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