The paper tackles the problems connected with the charge exchange in internal combustion engines. The
theoretical analysis of the charge exchange process in the SI engine has been presented. A system with independent,
early exhaust valve closing has been analysed. The analysed system enables realization of an internal EGR and
elimination of a throttling valve from an inlet system and reduce the charge exchange work, especially within the
range of partial load. The decrease of the charge exchange work leads to an increase of the internal and effective
works, which results in an increase of the effective efficiency of the spark ignition engine. The open, theoretical cycle
has been assumed as a model of processes proceeding in an engine. The system has been analysed individually and
comparatively with open Seiliger-Sabathe cycle. Benefits resulting from application of the system with early exhaust
valve closing have been assessed on the basis of the selected parameters: a fuel dose, a cycle work, a relative charge
exchange work and a cycle efficiency. The best results within decrease of fuel consumption and increase of cycle
efficiency are obtained for low engine load. The main parameters characterizing the process of the internal exhaust
gas recirculation were also determined. These are the ratio and the multiplicity of the exhaust gas recirculation.
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