The electromechanical control of valve timing at different supply voltages
Journal Title: International Journal of Automotive Engineering and Technologies - Year 2013, Vol 2, Issue 4
Abstract
Electromechanical valve systems (EMS) add advantages to engines in terms of performance and emission by eliminating the limitations of conventional variable valve systems that operate mechanically. Electromechanical valve systems also eliminate the need for certain mechanical parts (such as cam shaft and valve lifters), enabling valve timing to occur at any desired rate as independent of the cam shaft of the engine. End of the experimental works on Authors' previously published papers [1], give us the idea that more investigations are required on controlling the valve timings with ideal voltages. The purpose of this study was to measure the valve profile and electrical behaviour (coil current) of an electromechanical system designed for small volume internal combustion engines at different supply voltages (24 V, 33 V, 42 V, and 48 V), low and high engine speeds (1200 rpm and 3600 rpm), different valve openings (0o, 9o, 18o, 27o, and 36o KMA before the top dead centre), and different closing angles (27o, 36o, 50o, 63o, and 72o KMA after the bottom dead centre). An electromechanical valve system with a supply voltage of 33 V was most suitable for low-speed engine operations in order to achieve the identified valve timing. The amount of electricity consumed by using a 33 V supply voltage instead of a 42 V supply voltage at low engine speeds in the electromechanical valve system was bottom that the amount of electricity consumed by an electromechanical valve system operated with a supply voltage of 42 V at all engine speed intervals.
Authors and Affiliations
Bülent ÖZDALYAN*| Karabuk University, Mechnaical Engineering Faculty, 78050, Karabuk, Turkey., Mehmet TAŞLIYOL| Karabük University, Eskipazar Vocational High School, 78050, Karabük, Turkey.
Keywords
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