This work is the prosecution of a theoretical research which proposed a method to control the Otto engine load by means of a variable valve timing. As can be predicted, the early closing of the inlet valve allows to lower the engine load with reduced air-throttling, so that a fuel economy can be obtained. A hydraulic system was designed to perform the variable valve timing as follows. A rotating distributor, controlled by the camshaft, empties a capacity in the timing system, so the free closing stroke of the valve is determined by its spring. A particular device virtually eliminates the valve impact against its seat. The hydraulic system was applied to a single cylinder engine and bench tests were carried out so as to allow a comparison between the engine performances obtained by air-throttling and those obtained by variable valve timing. Preliminary experimental results are reported and discussed.
Variable valve timing as a means to control Otto engine load / Nuccio, Patrizio. - STAMPA. - II:(1982), pp. 71.1-71.6. (Intervento presentato al convegno XIX International FISITA Congress tenutosi a Melbourne nel November).
Variable valve timing as a means to control Otto engine load
NUCCIO, Patrizio
1982
Abstract
This work is the prosecution of a theoretical research which proposed a method to control the Otto engine load by means of a variable valve timing. As can be predicted, the early closing of the inlet valve allows to lower the engine load with reduced air-throttling, so that a fuel economy can be obtained. A hydraulic system was designed to perform the variable valve timing as follows. A rotating distributor, controlled by the camshaft, empties a capacity in the timing system, so the free closing stroke of the valve is determined by its spring. A particular device virtually eliminates the valve impact against its seat. The hydraulic system was applied to a single cylinder engine and bench tests were carried out so as to allow a comparison between the engine performances obtained by air-throttling and those obtained by variable valve timing. Preliminary experimental results are reported and discussed.Pubblicazioni consigliate
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https://hdl.handle.net/11583/2499730
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