1. FIVE STROKE I.C. ENGINE fi

2. CONTENTS Introduction Need for invention A new concept to I.C. Engines
How five stroke engine works
The “Five stroke cycle”
Four stroke engine
Comparison- Five stroke engine vs. Four stroke engine

3. Fuel consumption and Performance
Gallery
Conclusion
References
Queries

4. Introduction
The Five stroke engine concept was invented by Gerhard schimtz a Belgian mechanical engineer.
The engine was developed by ILMOR Engineering company,Uk into a working engine using a rapid prototype cast cylinder head, a machined from solid cylinder block and separate electrically powered oil and water pumps.
Now what differentiates the five stroke engine from all conventional engines is its new idea of intelligent collaboration.

5. Different types of cylinder,each specialized to perform one task.
They work with one another,and not just alongside one another.
Two overhead camshafts operate the conventional coil spring valve gear with HP camshaft running at 0.5x crankspeed and the LP camshaft running at 1x crankspeed.The engine is also turbocharged to increase the engine rating.

6. Expansion ratio=Compression ratio
Need for invention
The drawback of the classical gasoline engine
high efficiency requires high expansion ratio.
high power density requires low compression ratio.
Unfortunately
Expansion ratio=Compression ratio

7. Expansion Compression ratio
To cut this Gordian knot ,we would prefer an engine ,wherein…
High efficiency requires high expansion ratio.
High power density requires low compression ratio.
And fortunately
Expansion Compression ratio

8. How can we change unfortunately into fortunately??
Why not add an additional degree of freedom?
Why not allow different cylinders to concentrate on different tasks.
Why not add an additional engine stroke.
These were the questions that were making home in the mind of Mr.schimtz and finding their solutions he came up with this design

9. The main objective with the 5-stroke engine is to develop a gasoline engine with fuel consumption and emission level to that of current diesel engines,without the serious problem of particulate and NOx emissions that plagued the diesels.

10. A new concept to I.C engines
The concept states a simple modification with a great innovation i.e.
“Don’t throttle the engine down, load it up!”
The piston displacement of current internal combustion engines is dimensioned for a power regulation, where the admission is throttled down, when partial load is needed. This leadsto pumping losses and low mechanical efficiency’s at partial load and rather “big volumes” to satisfy the peak power requirements.
In 5-stroke engine,
One device designed to increase and control the breathing (i.e. the power)...
One device where the primary task is to burn this air..the high pressure cylinder of the 5-Stroke-Engine
One device to complete the conversion of the thermal energy into mechanical work.

11. How Five stroke engine works..
The 5-stroke concept engine utilises two fired cylinders (High Pressure - HP) operating on a conventional 4-stroke cycle which alternately exhaust into a central expansion cylinder (Low Pressure - LP), whereupon the burnt gases perform further work. The LP cylinder decouples the expansion and compression processes and enables the optimum expansion ratio to be selected independently of the compression ratio
Different types of cylinder,each specialized to perform one task.
They work with one another,and not just alongside one another.
Two overhead camshafts operate the conventional coil spring valve gear with HP camshaft running at 0.5x crankspeed and the LP camshaft running at 1x crankspeed.The engine is also turbocharged to increase the engine rating.

12. Five stroke cycle
The five-stroke cycle consists in the following steps:
1. Admission in the high pressure (HP) cylinder
2. Compression, followed by the ignition
3. First expansion of the burned gases
4. Second expansion of the burned gases
5. Exhausting of the burned gases
These five strokes will be realised inside of a three cylinder engine, where a supercharging
device is used to feed the high pressure cylinder. This device may be mechanical driven or by
a turbine, using the residual energy of the exhaust gases

13. Comparison - Five Stroke Engine VS FOUR Stroke Engine
There is one camshaft.
There are two overhead camshaft.
The compression ratio = expansion ratio.
High pressure charging is inconceivable
It generates 4 power strokes in course of two rotation of crankshafts.
The compression ratio expansion ratio not equal.
In 5-stroke engine even high pressure turbocharging is possible and it has no negative effect on efficiency.
It also generates 4 power strokes in 2 rotations of crankshafts but with high balance and high efficiency
Here the exhaust gases escape from engine at approx 6-8 bar producing high exhaust noise.
Here the exhaust gases escape from engine after 2 stage expansion at only 2-3 bar thus producing very low exhaust noise.
The engine is heavy, larger in size
The engine is smaller, lighter,produces same power as that of the diesel engine in a cheaper cost and is more environment friendly.

14. Fuel consumption and Performance
5-stroke performance figures Engine capacity 700cc (turbocharged)
Peak power rpm
Peak torque rpm
Fuel consumption of only 226 g/kWh
Measured 226 g/kWh on the very first five stroke
prototype.

15. Gallery

16. Application
The 5-stroke internal combustion engine has a wide application in the racing world. And the engine is successfully working in the races and bringing podium positions. This engine is currently used in PORSCHE GT car & tests are being done to install it in conventional cars also.

17. Conclusion
The fuel consumption is reduced from 16% (at full load) up to 30% (at low load).
The total piston displacement is reduced by about 37%, i.e. a 750 ccm five-stroke has identical torque characteristic as a 1200 ccm four-stroke.
The heat-exchanger could be by-passed in order to regulate the air/fuel mixture intake temperature, during normal use and during engine starting.
The high pressure drop at the beginning of the mixture admission in the high pressure cylinder permits high turbulence.
Problems, which may raise:
The power regulation is much more sophisticated in the case of the 5-stroke cycle. A
combination of turbine regulation using a wastegate and varying the air/fuel ratio of the mixture (see GDI engines) may solve this problem.
The increased heat loss density of the HP cylinder requires a carefully designed cooling system . The different masses (2 small and 1 big piston) requires a carefully designed mass equllibrium
Finally, it could be stated, that the new five-stroke cycle seems to, all in all, to be a serious alternative choice to the classical four-stroke engine in road cars. He could use all theexisting know-how concerning the four-stroke cycle, that is turbo charging, direct injection,to combine it into a high-tech combustion engine, that consumes much less primary energy and causes much less environment pollution.

18. References www.5-strok-engine.com www.ilmor.co.uk www.google.com

19. Queries

20. CREDITS
BCYRC’S UMRER COLLEGE OF ENGINEERING,UMRER B.E. V SEM(Mechanical) SUBMITTED BY: SAGAR.B.MESHRAM GUIDED BY: PROF. N.D. GEDAM Thank you