Automotive Internal Combustion Engine Classifications

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Automotive Internal Combustion Engine Classifications Powered By Docstoc
					 Engine  Design
 Cylinder Arrangement
 Camshaft Location and Number
 Ignition Systems
 Combustion Chamber Designs




                                 1
 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




                                                         2
 Inline
  • 3/4/5/6 cylinder configurations
 V-type
  • 6/8/10 cylinder configurations
 Horizontally   Opposed
  • 4/6 cylinder configurations




                                      3
       Order: sequence in which
 Firing
 cylinders fire
  • Cylinders are numbered from front to rear
  • Determined by number of cylinders and
   arrangement of crankshaft throws




                                                4
 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




                                                5
 Method   for igniting air/fuel mixture
 • Spark Ignition (SI)
    Gasoline
    LNG
    CNG
    Alternative fuels
 • Compression Ignition (CI)
    Diesel




                                           6
 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



                                                    7
 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



                                                     8

				
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