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Inverse problem of selection of the theoretical cycle for the real cycle of internal combustion engine

Żmudka Zbigniew, Postrzednik Stefan, Przybyła Grzegorz

Journal of KONES

2019

Vol. 26, No. 2

197--204

The effectiveness of work of an internal combustion engine can be assessed by means of the energy efficiency: theoretical, internal and effective... In the problem regarding the efficiency of obtaining a work from the tested SI engine, the theoretical Seiliger-Sabathe cycle was adopted as a reference model for the real engine cycle. For comparison, the OTTO cycle was also analysed. The engine indicating allows direct determination only of internal work. However, determining the work of the theoretical cycle first requires solving the problem of selecting the parameters of the theoretical cycle, according to the real cycle of the engine (inverse problem). In order uniquely to determine the course of the theoretical Seiliger-Sabathe cycle, it is necessary to determine the parameters of the starting point and the heat distribution number. The selection of the theoretical cycle for the real cycle, within the scope of determining the number of heat distribution, is to some extent of a contractual nature. Therefore, the problem of determining the number of heat distribution was solved by two own original methods. A comparison of the real cycle with the theoretical cycle determined for it is presented.

Algorithm of heat distribution determination on the basis of engine indicating

Przybyła G., Postrzednik S.

Journal of KONES

2006

Vol. 13, No. 1

149-158

Work of internal combustion engines, which are used as the driving source of cars, occurs not only at the full load, but also mostly at the part load, when the energy efficiency r/e is significant lower than in the optimal (nominal field) range of the performance parameters. One of the numerous reasons of this state is regular growing of the relative load exchange work of the IC engine. Using the worked out formulas it has been calculated that the relative load exchange work can achieve value up to 40 % at the part load (e.g. idle run) of the IC engine, whereby the engine speed influences the results too. As consequence of the growing of the relative load exchange work is the significant drop of the engine efficiency; from ca. 55 % down to ca. 25 %. The solutions of this problem are based on the fully electronic control of the motion of inlet and outlet valves, whereby the optimal internal recirculation ratio of flue gases should be taken into account. New reference cycles can be applied too.

Analizę procesów termodynamicznych zachodzących w komorze spalania silnika spalinowego można prowadzić na podstawie znajomości jego obiegu porównawczego. Pomiar szybkozmiennego ciśnienia w cylindrze silnika spalinowego (indykacja) umożliwia określenie ekwiwalentnej liczby rozdziału ciepła V. Prawidłowy dobór rozdziału ciepła (do zaproponowanego obiegu porównawczego) pozwala wyznaczyć wartości takich wielkości jak: iloraz ciśnień f, iloraz objętości