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Automotive Internal Combustion Engine Classifications

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1. Automotive Internal Combustion Engine Classifications. Engine Design. Cylinder Arrangement ... 2 stroke cycle (not currently used in automotive applications) ... – PowerPoint PPT presentation

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Title: Automotive Internal Combustion Engine Classifications


1
Automotive Internal Combustion Engine
Classifications
  • Engine Design
  • Cylinder Arrangement
  • Camshaft Location and Number
  • Ignition Systems
  • Combustion Chamber Designs

2
Engine Design
  • Reciprocating (piston)
  • 4 stroke cycle
  • 2 stroke cycle (not currently used in automotive
    applications)
  • Miller cycle differs from traditional 4 stroke
    by keeping intake valve open much longer
  • Rotary

3
Cylinder Arrangement
  • Inline
  • 3/4/5/6 cylinder configurations
  • V-type
  • 6/8/10 cylinder configurations
  • Horizontally Opposed
  • 4/6 cylinder configurations

4
Cylinder Arrangement
  • Firing Order sequence in which cylinders fire
  • Cylinders are numbered from front to rear
  • Determined by number of cylinders and arrangement
    of crankshaft throws

5
Camshaft Location and Number
  • Overhead Cam (OHC) cam located in cylinder head
  • SOHC one cam for both intake and exhaust valves
  • DOHC separate intake and exhaust cams
  • Pushrod cam located in engine block

6
Ignition Systems
  • Method for igniting air/fuel mixture
  • Spark Ignition (SI)
  • Gasoline
  • LNG
  • CNG
  • Alternative fuels
  • Compression Ignition (CI)
  • Diesel

7
Combustion Chamber Designs
  • Wedge
  • Intake and exhaust valves set in a plane
  • Spark plug located above or below valve plane
  • Cheaper manufacturing cost
  • Hemispherical (hemi)
  • Valves set in two planes
  • Spark plug located between valves
  • More efficient
  • Higher output
  • Higher manufacturing cost

8
Combustion Chamber Designs
  • Non-interference (freewheeling)
  • Clearance between open valves and piston at TDC
  • Interference
  • No clearance between open valves and piston at
    TDC
  • Major engine damage if cam or crank is turned
    independently
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