1. Difference Between otto and diesel cycle
BY: JAIN NIKHIL PRAKASH
Automobile Engg. Dept.
Division E

2. OTTO CYCLE 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. DIESEL CYCLE Invented by Rudolf Christian Karl Diesel in 1893
First engine was powered by powdered coal
Achieved a compression ratio of almost 80
Exploded, almost killed Diesel
First working engine completed generated 13 hp

4. WORKING OF OTTO CYCLE 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

5. Working
Process 1-2 Piston moves from crank end to cylinder head end (TDC, top dead centre and minimum volume) as the working gas with initial state 1 is compressed isentropically to state point 2, through compression ratio
Process 2-3 The piston is momentarily at rest at TDC. During this instant, which is known as the ignition phase, the air/fuel mixture remains
Process 3-4 The increased high pressure exerts a force on the piston and pushes it towards the BDC.
Process 4-1 The piston is momentarily at rest at BDC

6. DIESEL HOW LOOKS ?

7. WORKING OF DIESEL CYCLE
Fuel injected
at TC A I R
Air
Combustion
Products
Actual
Cycle
Intake
Stroke
Compression
Stroke
Power
Stroke
Exhaust
Stroke
Qin
Qout
Air
Diesel
Cycle BC
Compression
Process
Const pressure
heat addition
Process
Expansion
Process
Const volume
heat rejection
Process

8. Working Process 1 to 2 is isentropic compression of the fluid (blue)
Process 2 to 3 is reversible constant pressure heating (red)
Process 3 to 4 is isentropic expansion (yellow)
Process 4 to 1 is reversible constant volume cooling (green)

9. DIFFERENCE BETWEEN OTTO AND DIESEL
Uses
In diesel engines, heating systems
In petrol engines
Made from
Petroleum/ Crude oil
Petroleum/ Crude Oil
Energy content
38.6 MJ/litre
34.6 MJ/litre
Made by
Fractional distillation
Torque (for 10L engine)
rpm
rpm
Power (for 10L engine)
rpm
rpm
Power = torque*RPM
210°C
246°C
CO2 emission
More than gasoline(petrol). Diesel fuel produces approximately 13% more CO2 gas per gallon of fuel burned, compared to gas (petrol) engines.
Lower than diesel.

10. DIFFERENCE BETWEEN OTTO AND DIESEL

11. Production of petrol vs diesel
Petroleum is refined to produce petrol and diesel.
Fractional Distillation process is used on petroleum and at various temperatures, different by products are formed from it.
Petrol and diesel both are derived at varying temperatures during refining process. Petrol is produced at temperature between 35 degrees to 200 degrees while diesel is produced at a boiling point of degrees.
After distillation, in order to use these byproducts as commercially acceptable petrol and diesel, some blending with other elements has to be done.
Petrol is produced first in this process as it is produced at a lower temperature than diesel.

12. THANK YOU SIR