valvetronic engine technology - IFET College of Engineering
valvetronic engine technology - IFET College of Engineering
valvetronic engine technology - IFET College of Engineering
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• taking a modular approach in order todevelop specific <strong>engine</strong> variants;• ensuring a significant potential for ongoingdevelopment; and• providing the foundation for other<strong>engine</strong> variants, i.e. communality withfuture<strong>engine</strong>s.All <strong>of</strong> this led to the development<strong>of</strong> a fully variable valve drive system,BMW Valvetronic, helping tosignificantly reduce fuel consumptionwhile maintaining stochiometric drivingconditions with all the usual advantages.What Is Valvetronic?The Valvetronic <strong>engine</strong> is theworld's first <strong>engine</strong> without a throttlebutterfly. Valvetronic allows the <strong>engine</strong>to run without a throttle butterfly, thecylinder charge being determined underpart load as a function <strong>of</strong> the valveopeningperiod. The intake and outletcamshafts are driven by variable camadjustment, BMW’s Vanos <strong>technology</strong>.A further advantage <strong>of</strong> this concept isthat it allows worldwide use <strong>of</strong> theproven three-way catalyst for emissionsmanagement, thus meeting even thestrictest emissions standards in the US.Innovative <strong>technology</strong> wasessential in order to reach the demandingobjectives and functional requirementsdesired. However, at the same time, thisconcept demanded the utmost <strong>of</strong> theelectronic control and managementsystems in the <strong>engine</strong>.ConceptTaking nature as the role model: humanbeings also apply the ValvetronicprincipleA comparison with the humanbeing clearly explains how Valvetronicworks: Whenever we are required tomake a great effort, we human beingsbreathe in a deep and long process <strong>of</strong>ventilation. Whenever we need less air,we do not throttle the supply <strong>of</strong> air by,say, closing our nose or our mouth, butsimply breathe in a shorter, flatterprocess <strong>of</strong> ventilation. In a conventionalcombustion <strong>engine</strong> the throttle butterflyis basically comparable to a humanbeing keeping his nose or mouth at leastpartially closed. With its large valve lift(= deep, long ventilation) and shortvalve lift (= flat, short process <strong>of</strong>ventilation), Valvetronic, on the otherhand, is able to breathe in the same way