1. The five stroke internal combustion engine
Inventor & Patent owner: Dipl. Ing. Gerhard Schmitz

2. The dilemma of the classical gasoline engine:
1. High efficiency requires high expansion ratio
2. High power density requires low compression ratio
BUT UNFORTUNATELY
Expansion ratio =
Compression ratio

3. To cut the Gordian knot, we would prefer an engine, wherein ...
1. High efficiency still requires high expansion ratio
2. High power density still requires low compression ratio
AND FORTUNATELY
Expansion ratio ≠
Compression ratio

4. How can we change a
“BUT UNFORTUNATELY =“
into an
“AND FORTUNATELY ≠” ?

5. Three times... “There is no reason to not try it!”
Let’s change things...
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?
Three times... “There is no reason to not try it!”

6. In 2000, a new engine is born ...

7. The software design...
... of the stage 1 prototype from Ilmor

8. The hardware manufacturing...
... of the stage 1 prototype from Ilmor

9. The software design...
... of the stage 2 prototype from OEM

10. What about performances?
Ilmor stage 1 prototype on the Dyno: Engine size: 1478 ccm Power: rpm Peak Torque: rpm Fuel consumption: 226 g/kWh
OEM stage 2 prototype on the Computer: Engine size: 2000 ccm Power: rpm Peak Torque: rpm Fuel consumption: 204 g/kWh

11. Fuel consumptions of...
Measured 226 g/kWh on the very first five stroke prototype, and
Calculated 204 g/kWh....
... must be compared to 240 g/kWh achieved by the currently best gasoline engine of the Toyota Prius...
... after decades of development years!

12. And what about accuracy of calculated engine performances?

13. More informations ... Theoretical analysis by Gerhard Schmitz
Theoretical analysis by Hans Alten
Fire up of Ilmor prototype
Ilmor website
Mario Illien on TV
United States Patent

14. I do fully agree with Mario Illien, when he characterises the five stroke engine being a …
“gasoline engine with fuel consumption and emission levels comparable to that of current diesel engines, without the serious problem of particulate and NOx emissions that plague diesels”.
… and simply being an…
“ingenious energy efficient engine”.

15. Thank you for your attention... Gerhard Schmitz, St.Vith 2009