19-04-2012, 12:11 PM
Internal Combustion Engines -The Diesel
I C ENGINE.ppt (Size: 1.05 MB / Downloads: 104)
Thermodynamic Principles
All internal combustion
Open cycle, heated engine
Gasoline (Otto) engine
Spark ignition
Compresses air-fuel mixture
Diesel engine
Compressed ignition
Compresses air only
Structural Components
Cylinder Head/Assembly
Serves to admit, confine, and release fuel/air
Cover to cylinder block
Supports valve train
Crankcase
Engine frame section that houses the crankshaft
Oil sump
Reservoir for collecting and holding lube oil
Moving Components
Piston
Acted on by combustion gases
Lightweight but strong/durable
Piston Rings
Transfer heat from piston to cylinder
Seal cylinder & distribute lube oil
Piston Pin
Pivot point connecting piston to connecting rod
Connecting Rod
Connects piston & crankshaft
reciprocating rotating motion
Four-Stroke Diesel Engine
Power stroke
Intake and exhaust valves shut
Fuel injected into cylinder and ignites
Piston forced from TDC to BDC
Exhaust stroke
Intake valve shut, exhaust valve open
Piston moves from BDC to TDC
Combustion gases expelled
Supporting Systems
Ignition system
Diesel has compression ignition
Gasoline has spark plugs
Cooling system
Uses fresh water and/or salt water to cool
Lubrication system
Provide lubrication and cooling
Drive Train – Direct or Indirect