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Internal combustion engines (ICE) are the main sources of powering for almost all road vehicles, yet many other machines too. Being under strength development for a number of years, they have already reached a relatively high level of technical excellence and now they also produce acceptable output parameters. Still, they are not devoid of drawbacks. Harmful exhaust emissions can be pointed as the most important here. This problem is the main focus of interest for automotive researchers and engineers. Continuous decrease of exhaust emission limits additionally intensifies their efforts to produce more green engines and vehicles. On the other hand, rapid development of road transportation and the growth of end-users’ demands toward more and more comfortable, durable, reliable and fuel-saving vehicles unceasingly calls for improvements in engine design and technology.
Despite many attempts, replacing the internal combustion engine with other, but equally effective power source still fails. Therefore, extensive works on the improvement of internal combustion engines should be carried out and the results need to be widely published.