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Internal Combustion Engine

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Internal Combustion Engine Chapter 7 Combustion Internal Combustion Engine Chapter 7 Combustion 7-1 (SI) ... – PowerPoint PPT presentation

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Title: Internal Combustion Engine


1
Internal Combustion Engine
  • Chapter 7
  • ??
  • Combustion

2
7-1 ???(SI) ??? ??
  • ?? ? ?? ??
  • ??-?? ???? 5 (?? ??? 10)? ???? ??
  • (2) ?? ??
  • ???? ??? ?? ?? (?? ??? ??, 80 90)? ???? ??
  • (3) ?? ??
  • ?? ?? ??? ?? 5 (?? ??? 10)

3
??? ????
??? ????? ?? ??? ?? ??(?? ???? ??)? ?? ????(BTDC
10 30). ??? ???? ? 6 ??? ??? ?? ??. ?????
????? ??? ???? ??? ?? ???-?? ??, ????? ?????
????? ??? ?? 0.7 1.7 mm ??. ??? ??? 650 -
350C, 950C ???? ????, 350C??? ????(????). ???
?????? ??? ??? ??? ??? ???? (160,000 km(100,000
??))
4
??? ?? ??? ?? ??
?? 5-10? ??? ??? ???? ?? ???? ????. ??, ?? ?
???? ???? ?? ????? ?? ???? ???? ???? ? 10?
???. ??? ??? 30? ??? ?, ????? ??? ?? ??? ??
60? ??? ?? ????.
5
(No Transcript)
6
??? ?? ???, TDC?? ??? ??? ???? ???? ????? ??
????? ?? ????. ??? ???? ???? ??? ???? ?? ??? ??
??? ?? ????? ?? ????. ?? ????? ????, ???? ???
????? ?? ????, ?? bTDC 10?? 30 ??? ??.
7
????
aTDC 15 - 20 ??? ??-?? ??? 90 95? ????, ????
??? ? ??? ????. ???? ??? ??? ?? ??? ??? ???? 0?
???, ???? ???? ?? ??? ???? ?? ??? ??? ??.
8
????
-????? ?? -?????? ??? ??? ??? ????? ??? ??-???
??? ??? ??? -?????? ???? ??? ??? ???? ??? ???
??? ??? ????.
-???? ??? -????? ???? ??? -EGR
9
???? ??? ???? ?????? ???? ????? ??? ???? 2 6
?????? normal ??? ?? ???, ???, ???? ? ?? ??? ????
??? ???? ??? ????? ??? ???? ??? ??? ??. ??? ???
????? ???? ??? ??? ??? ??? ??? ??? ????? ????.
10
??? ??? ??? ???? ??? ??? ??? ?? ??? ???? ???
????? ????? ????. ????? ??? ??? ?? ????? ???.
11
?? ???? ????? ????? ???? ?????, ???? ?? ???? ?? ?
?? ?? ??? ???? ??? ??? ? ??? ??? ? ??.
12
?? ? ??
??? ??? ??, ?? ?? ? ?? ?? ??? ????? ??? ????? ??
????. ??? ??? ??, ??? ? ???? ??? ??? ??? ??? ???
????? ???? ????? ???? ??? ?? ??? ??. ?? ???? ???
??, ??? ???, ????? ??, ???, ??? ??, ????, EGR
????, ??? ?, ???? O2, CO, ???? ????. ?????
????, ????, ??????, ??? ???? ??, ???, ??? ??, ???
?? ??, ???? ?? ??, ??? ???? ?? ???.
13
7-2 ?? ???? ??? ?? ?? ??? ??
14
?????? ? ??? ??? ? ??? ??? ????? ?? ??? ?? ?
????, ?? ??? ??? ??? ?? ???? ??? ?? ??? ????.
15
7-3 ?? ?? ??
  • ????
  • ????
  • ??? ??
  • ???? ??? ??
  • ??????

16
7-4 ??? ?? ?? ???
??? ?? ??? ?? ??? ???? ?? ????? ???? ???? ????
??-?? ???? ?? ??? ??? ? ??? ??. ???? ???? ????,
?? ?? ??? ? ?? ???(????)? ??? ??.(??6-4) ?????
????? ?? ?? ???, ???? ?? ?? ?? ??? ?? ???, ????
?? ??? ????, ???? ?????. ????? ????? ?? ?? ???
??? ??? ?? ?????. ????? ?? ?? ?? ????.
17
7-5 ???? ??? ??
  1. ??(atomization) ?? ??? ?? ?? ???? ????. ????? ???
    ?? ?? ??? ???? ?? ??? ???? ????? ?????.
  2. ??(vaporization) ?? ??? ?? ???? ??? ????.
  3. ??(mixing) ???? ?? ??? ?? ???? ???? ???? ??? ???
    ????? ??.
  4. ???(self-ignition) ????? 68 ? ? bTDC 8 ??
    ??-?? ???? ????? ????.
  5. ??(combustion) ??? ???? F11.5 ? ???? ?? ?? ???
    ??? ?? ??? ??? ??? ?????? ????.

18
(No Transcript)
19
(No Transcript)
20
IDI(Indirect Injection) CI Engine
DI Diesel engine? ??? ????(main chamber)? ? ???
?? ???(?? ????)? ???? ??? ??? ????? ???? ??? ???
? ??? ???? ?? ??? ???????? ????? ??? ???? ????
???? ??. IDI Diesel engine? ????? ??? ???? ?? ???
?? ?? ???, ?? ??? ?? ??? ??? ???? ???? ?? ?? ??
??? ??.
Auxiliary Chamber
Main Chamber
  • Two Types of Small Indirect-Injection
  • Diesel Engine Combustion System
  • Swirl Prechamber
  • Turbulent Prechamber

21
DI(Direct Injection) CI Engine
DI Diesel engine??? ??? ?? ????? ????. DI Diesel
engine? ???? ?? ????? ?? ??? ?? ????? ?? ????? ??
DI Diesel engine?? ??? ??.
Common Types of Direct- Injection CI Engine
Combustion System (a)Quiescent Chamber with
Multihole nozzle typical of Larger
Engines (b)Bowl-in-Piston Chamber With Swirl and
Multihole Nozzle (c)Bowl-in-Piston Chamber With
Swirl and Single-hole Nozzle
22
Combustion In CI Engine
SI engine? ??? ????? ?? ???? ????? ? ?? CI engine
??? ????? ?? ??? ????. ????? ?? ???(????
2000????) ??? ??? injector?? ??? ??? ????.
INJECTOR? NOZZLE? ??? ?? ?? ??? ??? ??? ?? DROP?
?? ??? ?? ??? ??? ?? ????? ??? ??? JET? ??? ??
DROP?? ? ???? ??. ?? ??? ?? ??? ?? ??? ?? ?? ???
??? ??? drop?? ??? ??? ??. ? ??? ??? ???? ??
??(ignition delay)? ?? ? ?????? ??? ????. ????
???? ??? ?? ????? ??? ??? ??? ??? ???? ????? ????
??? ??? ??? ????? ??? ??? ??? ???? ?? ?? ?? ??
???? ?? ? ??? premixed combustion period? ?? Fig
7-16? B?? ??? ???? ???? ??? ????. ??? ???? ???
???? ???? ???? ?? ???? ?? ?? ???? ??? ??? ??? ??.
23
Combustion In CI Engine
???? ??? premixed combustion period?? ???? ??? ??
??? ?? ????. ??? ??? ??? ???? ?? ignition delay?
??? ??, ??? ??? ?? ??? ?? ??? ??? ??(??? ??? ???
???? ??????? ???? ?????), ??? ???? ?? ?? ?? ???
????? ?? ???? ??? ? ??. ??? ??? ???? 45???? EU???
51??? ????. ????? ?? ?? ?? ?? ?? ????? ??? ???
? ? ??? ??? ????? ? ??? ???? ??? ?? ? ????? ????
??. ?? mixing controlled period? ?? ????? ??? ???
????.
24
?? (soot)
?? ?? CI engine??? ????? ??? ??? ???? ???? ??
????? ???? ????? ???? ??. ?? ???? ??? ?????? ???
? ????? ?? ??? ????? ?? ??? ?? ??? ??? ???? ???
??? ?? ?? ??? ???? ?? ?? ??? ?? ?? ?? soot? ??.
soot? ??? ??? ??? ?? ??? ?????? ??? ??? ?????
????. ??? ? soot? ??? ???? ?? ???? ???? ???
??(smoke)? ???? ??.
25
PM(Particulate Matter)
??? ??? ?? ???? ?? ???? ??? ??? ??? ?? ????? ???
? soot? ??? ? ??? ?? PM(Particulate Matter???
??)?? ??. PM? ???? ??? ?? ?????? ?? ?? ????. ???
???? ??? ??? ???? ???? ?? ? ?? ??? ????????
0.8??? ?? ??? ?? smoke? ??? ??. ???? ????? ?? ???
0.8??? ??? ???? ???? ??. PM? ??? ??? ??? ????
??? ??? ? ?????. ????? ?? ppm? ? ???? ?? ppm??
??? ??? ???? ??? EU??? 2005?? 50ppm?? ??? ?? ??.
26
NOx
PM? ??? ?? ??? ????? ????? NOx??. ????? ???? ????
?? ??? ??????? NOx? ?? ???? ??. NOx? ??? ????
?????(EGR)? ??? ????? ??? ??, ????? ??? ????? ???
??? ??? ??, ??? ??? ???? ?? ?? ??.
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