ข้อสอบสามัญเครื่องกล automotive 3/2547
TRANSCRIPT
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6 5 20 1. 91 95 Ethanol 10%
MTBE ? ?
. MTBE. .
.
/
.
. . (20 .)
. MTBE Octane No. Gasoline MTBE Pollution
. Ethanol Ethanol
Gasoline Absorb Cost
.
Drain
. Aluminum Alloy Ethanol
. Ethanol
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2. Hybrid ()
(20 .)
- Hybrid - - - - - 2
3. 10 (X) (20 30 )
1) Swept volume . clearance volume . Total volume . Displacement volume. Crevice volume . Intake volume
2) . 2 1 1 . 1 1 2
. 2 2 . 2 1. 1 1
3) Variable geometry turbocharger . waste gate . waste gate . .
.
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4) brake mean effective pressure
. bmep = nmep fmep . bmep = wb/v
. bmep = m x imep . bmep = imep fmep.
wb = brake work v = displacement volume
m = mechanical efficiency imep = indicated mean effectivepressure
fmep = friction mean effectivepressure nmep = net mean effectivepressure
5) Air standard Otto cycle . . . . .
6) stoichiometric C3H8 AF . 15.00 : 1 . 15.25 : 1 . 15.49 : 1 . 15.69 : 1 . 15.88 : 1
7) . 97 . 95 . 93 . 91 . 87
8) 3200 CC. 5 4 2400 rpm 20 bTDC 5 aTDC 95% fuel equivalence ratio 0.80 2 1.181 kg/m3. 0.00035 kg . 0.0035 kg . 0.035 kg . 0.35 kg . 3.5 kg
9) 18 bTDC 1800rpm. 8 12 aTDC 8.4 cm. 8 mm. . 24.5 m/s . 22.4 m/s . 20.6 m/s . 16.4 m/s . 14.5 m/s
10) EGR valve
. HC . CO . CO2 . NOX . SOX
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1. . Displacement volume 6. . 15.25 : 12. . 2 1 7. . 953. . 8. . 0.0035 kg4. . 9. . 24.5 m/s5. . 10. . NOX
4. 6 3.3 AF = 20 Air standard dual cycle 100% 60 C 101 kPa 14:1 . Cutoff ratio. Pressure ratio. Indicated thermal efficiency
. Net indicated work. 1 kg(20 .)
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5. 20 (X) ( 1 20 )
1. . . .
. 2.
. . . .
3. choke
. . . .
4. . .
. .
5. Knock (detonation) . . . .
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6. . . . .
7. (oxygen sensor) . . 80% ..........
. .
8.
...-.-
9. . .
. -. -
10. pollution (CO, HC, NO X). .. NO X.
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11. . . . .
12.
. . . .
13. Parallel Hybrid Car..
..
14. . . . .
15. Parallel Hybrid Car. 25 %. 50 %. 75 %. 100 %
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16. . . . .
17. 50 km/h ()
. . . .
18. .
. () . . .
19. NGV. .
. .
20. . . . .
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1. .2. .3. .4. .5. .6. .7. .
8. .9. .-10. . NO X11. .12. .13. .14. .15. . 100 %16. .17. .18. .
19. .20. .
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6. 20 (X) ( 1 20 )
1. . 20 ./.. 40 ./.. 60 ./.
. 80 ./.2.
. . . .
3. choke
. Stoichiometric mixture. hemically correct mixture. Rich mixture. Lean mixture
4. Knock. . (advance ignition timing)
. (retard ignition timing).
5. . . . (injection timing) .
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6. . . . .
7.
. . . .
8. ABS . .
. ( ) .
9. (). . . .
10. . . . -. -
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11. . . . -. -
12.
. . . .
13. Exhaust Cas Reciculation Valve . .
. .
14. . . . .
15. (Hot Spark Plug) . . Spark. .
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16. ( Radial ). . . .
17. Parallel Hybrid Car
. . . .
18. Parallel Hybrid Car.
. . .
19. . . .
. 20.
. . . .
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1. .40 ./.2. .3. .Rich mixture4. .5. .6. .7. .8. . ( ) 9. .10. .11. .-12. .13. .14. .15. .16. .17. .18. .19. .20. .