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The presented work concerns the study of the fuel consumption and emissions benefits achieved at part load by employing a fully variable valve train in a 1.6L SI gasoline engine. The benefits achieved when using variable valve timing alone, and combined with an early intake closing strategy for un-throttled operation were explored. In addition, particular interest was given to the presence of internal Exhaust Gas Recirculation (EGR) and its ability to reduce pumping loss at part load. An engine model employing multiple sub models to handle variable valve operation was constructed using a commercial gas dynamics engine code, allowing detailed analysis of three valve strategies. Using the engine model, a theoretical study was carried out to study key valve timing cases. A detailed breakdown of the mechanisms present in each case allowed a comprehensive understanding of the influence of valve timing on gas exchange efficiency and fuel consumption.  Ozet: Sunulan calisma 1.6L benzinli motor SI icinde tamamen degisken valf tren kullanilarak kismi yukte elde yakit tuketimi ve emisyon faydalari calisma ile ilgilidir. Un-daraltilmis operasyon icin erken alim kapama stratejisi ile yalniz degisken supap zamanlamasi kullanirken elde ve birlesik yararlari incelenmistir. Buna ek olarak, ozellikle faiz ic Egzoz Gazi Devridaim (EGR) ve kismi yukte pompalama kaybini azaltmak icin yetenegi varligi verildi. Degisken valf islemi islemek icin birden cok alt modelleri kullanan bir motor modeli uc valf stratejilerinin detayli analizini saglayan ticari bir gaz dinamigi motor kodu kullanilarak insa edilmistir. Motor modeli kullanarak, teorik bir calisma anahtar supap zamanlamasi vakalari incelemek amaciyla gerceklestirilmistir. Her durumda mevcut mekanizmalarin ayrintili bir dokumu gaz degisimi verimlilik ve yakit tuketimi supap zamanlamasi etkisi kapsamli bir anlayis sagladi.

international journal of automotive engineering and technologies :

A Comparison of Variable Valve Strategies at Part Load for Throttled and Un-Throttled SI Engine Configurations / Throttled ve Un-Throttled SI Motor Yapılandırmaları Part yükte Değişken Valf Stratejilerinin Karşılaştırılması