RAI SAHEB BHANWAR SINGH COLLEGE NASRULLAGANJ

1. By: GYANRAO DHOTE
Presented By: ROSHANI
RAJPUT

2. • Nicolaus was a
German inventor
• Born in 1832 in
Holzhausen an der
Haide
• His design was the
first 4 stroke ICE to
have any kind of
practicality

3. • The Otto Engine is a
single cylinder 4
stroke ICE.
• It is one of the first
engines to use a
spark plug which is
used to ingnite
compressed air/fuel

4. Explain what is the Otto cycle, how it works
and application
• Also known as 4 stroke cycle in technical
terms
• A Cycle used in internal combustion
engines
• The first such engine was built by the
German engineer Otto in 1861

5. 4 Strokes of the Otto Cycle
• Cycle contains 4 strokes
1)Intake stroke
2)Compression stroke
3)Power stroke
4)Exhaust stroke

8. • Any 4 stroke engine is an Otto Engine
• The 4 strokes are: Intake, Compression, Combustion/Power,
Exhaust.
• The cycle is:
1-2: adiabatic compression
2-3: heat addition at constant volume
3-4: adiabatic expansion and rejection of heat at constant volume

9. The Internal combustion engine (Otto Cycle)
• The Otto cycle is a set of processes used by spark ignition internal combustion
engines (2-stroke or 4-stroke cycles). These engines a) ingest a mixture of fuel and
air, b) compress it, c) cause it to react, thus effectively adding heat through converting
chemical energy into thermal energy, d) expand the combustion products, and then e)
eject the combustion products and replace them with a new charge of fuel and air.
The different processes are shown in Figure 3.8:
• Intake stroke, gasoline vapor and air drawn into engine ( ).
• Compression stroke, , increase ( ).
• Combustion (spark), short time, essentially constant volume ( ). Model: heat
absorbed from a series of reservoirs at temperatures to .
• Power stroke: expansion ( ).
• Valve exhaust: valve opens, gas escapes.
• ( ) Model: rejection of heat to series of reservoirs at temperatures to .
• Exhaust stroke, piston pushes remaining combustion products out of chamber ( ).
• We model the processes as all acting on a fixed mass of air contained in a piston-
cylinder arrangement,

12. The actual cycle does not have the sharp transitions between the different
processes that the ideal cycle has, and might be as sketched in Figure

13. Efficiency of an ideal Otto cycle

15. • http://en.wikipedia.org/wiki/Otto_cycle#Th
e_Otto_cycle
• http://en.wikipedia.org/wiki/Otto_engine
• http://en.wikipedia.org/wiki/Nicolaus_Otto