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TitleAnalysis of a new vvt trapezoidal rotary valve
Author(s)Martins, Jorge
Baptista, Afonso
Pinto, Rui
Brito, F.P.
Costa, Tiago J.
Issue date2019
PublisherSAE International
JournalSAE Technical Papers
CitationMartins, J., Baptista, A., Pinto, R., Brito, F.P. et al., “Analysis of a New VVT Trapezoidal Rotary Valve,” SAE Technical Paper 2019-01-1202, 2019, doi:10.4271/2019-01-1202
Abstract(s)The current study introduces a Variable Valve Timing (VVT) trapezoidal rotary valve for a 4-stroke spark-ignition engine. Being trapezoidal, enables the rotary valve to change the inlet and exhaust timing continuously, therefore allowing it to control the engine load without the need for a throttle valve. The geometry of the valve is studied in detail, calculating the intersection areas between the windows (ports) of the valve and those of the combustion chamber during the engine cycle. As the valve openings are trapezoidal and the opening of the combustion chamber is trapezoidal as well, there is a multitude of geometry variables that need to be optimized. During idle the engine needs to breathe through just a very small area, while during high load operation the opening needs to be generous. Finally, the trapezoidal rotary valve system is compared to a conventional VVT system.
AccessRestricted access (UMinho)
Appears in Collections:MEtRICs - Artigos em livros de atas/Papers in proceedings

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