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Diesel Engines

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Gas vs. Diesel Engines No Carburetor or ... Louder engine due to large amount of rapidly expanding gas Diesel fuel is more expensive Higher initial cost Lower ... – PowerPoint PPT presentation

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Title: Diesel Engines


1
Diesel Engines
  • Transportation
  • Mr. ORourke

2
History
  • Invented in the 1890s in Germany by Rudolf
    Diesel.
  • Invented because of the inefficiency of steam
    power (10 efficient)

3
How it Works
  • Internal Combustion engine
  • Similar to gasoline powered
  • Compression ignition vs.
  • spark ignition
  • Usually 4-stroke, sometimes 2-stroke
  • http//www.youtube.com/watch?vx9yS2xdPJSU

4
How it Works (contd)
  • Intake- The intake valve opens up, letting in air
    only.
  • Compression-The piston moves back up and
    compresses the air.
  • Combustion -As the piston reaches the top, fuel
    is injected at just the right moment and ignited
    by heat from compression, forcing the piston back
    down.
  • Exhaust-The piston moves back to the top, pushing
    out the exhaust created from the combustion out
    of the exhaust valve.

5
Gas vs. Diesel Engines
  • No Carburetor or port injection in Diesels
  • Uses direct injection into cylinder
  • No spark plugs
  • Glow plugs to heat engine
  • Much more compression than gasoline engine
    (approx 2-3 times more)
  • Highest thermal efficiency of all engine types

6
Important Notes
  • Compression heats air to approx 1000 degrees F.
  • Air intake is constant unless a turbo is used
  • Only fuel is added when throttle is applied
  • Fuel is added as a mist into cylinder
  • abrupt increase in pressure above the piston
    causes knocking sound

7
Advantages
  • Due to high compression and expansion ratio,
    diesels are 45 efficient compared to gasoline at
    30
  • No high voltage electrical system needed
  • Diesel engines usually last 2x longer than
    gasoline due to stronger parts and better
    lubrication

8
Advantages (contd)
  • Diesel fuel is safer than gasoline (not
    explosive)
  • Fuel efficiency remains constant
  • Much more torque than gas due to longer piston
    stroke (large diameter crankshaft needed)
  • More potential for power due to adding of turbo
    or sometimes supercharger

9
Disadvantages
  • Louder engine due to large amount of rapidly
    expanding gas
  • Diesel fuel is more expensive
  • Higher initial cost
  • Lower performance overall compared to gas in
    regular driving
  • Problematic in cold weather
  • Low sulfur fuel now used but exhaust can still
    smell and smoke

10
Uses
  • 90 of transportation industry
  • Power generators
  • Large boats/ships
  • Locomotives
  • Construction machinery
  • Cars and trucks
  • Largest diesel engine
  • 109,000 hp _at_102rpm

11
Costs/Future
  • Costs more per gallon due to demand
  • Higher initial costs, lower overall costs
  • Newer, cleaner fuels now being used
  • More cars using diesel
  • Quieter, more available cars

12
  • http//www.youtube.com/watch?vvGhlgphrBxA
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