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Modelling of cylinder system friction using P2M tool

Abhay Pai
Göteborg : Chalmers tekniska högskola, 2016. Diploma work - Department of Applied Mechanics, Chalmers University of Technology, Göteborg, Sweden, ISSN 1652-8557; 2016:71, 2016.
[Examensarbete på avancerad nivå]

The internal combustion engines have been there for more than a century now and are constantly undergoing some improvements. Although the combustion engines have improved the human efficiency, it has also brought upon serious problems like the exhaust emissions. Over the last few decades, the number of automobiles have increased manifold and so has the emissions including carbon monoxide, hydrocarbons, nitrous oxides and particulate matter. This has led to global warming which has disastrous consequences if not kept in check. The emission norms are designed to keep the automobiles emissions within a limit. These norms are becoming stringent every few years to decrease the emissions by a further extent. Car manufacturers are doing a lot of research to be ahead of the competition and be within the norm to avoid paying hefty fines. Downsizing is considered to be the future for emission reduction. The number of engines and the capacity is becoming smaller and turbochargers are installed for better power and fuel efficiency. Volvo engines for example has downsized their engines from in-line 5 cylinder to 4 and now the next generation engines are 1.5 litre 3 cylinder engines. This downsizing is one of the most effective ways to decrease the emission. It is also known that for an engine, on an average the efficiency is only about 30 percent. Though it has increased slightly over the last few decades, it is very difficult to improve this value substantially. That is because most of the energy is lost as heat and there are friction losses in the engine. Part of the heat energy which would have wasted is used in turbochargers which have improved the efficiency. Efficiency loss due to friction is still a very big area with huge potentials and opportunities. The thesis here is divided into two parts. The first part deals with the friction calculation in the piston-cylinder system using the P2M software provided by MIT which studied the piston secondary motion to calculate the friction loss. The second part deals with the effect of changes in the inputs like the engine speed, combustion pressure etc. on the friction force and FMEP values.

Nyckelord: Efficiency, piston-cylinder system, piston secondary motion, MIT, friction force, FMEP

Publikationen registrerades 2018-04-18. Den ändrades senast 2018-04-18

CPL ID: 254968

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