Experimental investigation of a variable compression ratio system applied to a gasoline passenger car engine

Wittek, Karsten; Geiger, Frank; Andert, Jakob; Martins, Mario; Cogo, Vitor; Lanzanova, Thompson

doi:10.1016/j.enconman.2019.01.037

Cited by 29 publications

(10 citation statements)

References 12 publications

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“…(5) The initial temperature is a vital parameter which determines the residual water vapor show positive or negative effect on propane oxidation, this conclusion can be utilized to explain enhancement of ion current signal during ICRC engine experiments and rapid ion current signal decrement as DWI quantity increased. (6) The formation of electron is enhanced under residual water vapor involvement, the maximum electron formation and its timing are both enhanced, which is in consistent with the experimental results reported in previous study. To be noted that, this conclusion can only be drew under certain in-cylinder temperature, the in-cylinder electron under DWI may decrease as in-cylinder temperature drops.…”

Section: Discussionsupporting

confidence: 92%

“…Compare with the battery electric vehicle (BEV) and fuel cell vehicle (FCV), the main obstacles of ICE are relatively low tank-to-wheel (TTW) efficiency and in-use emissions [1][2]. While the brake thermal efficiency (BTE) of modern commercial petrol ICE has improved significantly by implementation of advanced engine optimization technologies including lean/diluent combustion [3], Atkinson/Miller cycle [4], intensive in-cylinder tumble flow [5], variable compression ratio [6], controllable auto-ignition [7], etc., the overall TTW efficiency remains under 45% [8]. The requirement for novel combustion concept which is capable in realizing extreme high thermal efficiency while achieving zero emission is becoming more and more urgent.…”

Section: Introductionmentioning

confidence: 99%

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Chemical kinetic analysis of in-cylinder ion current generation under direct water injection within internal combustion Rankine cycle engine

et al. 2022

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Direct water injection provides feasible solution for combustion optimization and efficiency enhancement within internal combustion Rankine cycle engine, while the feedback signal of close-loop direct water injection control is still absent. Ion current detection monitors in-cylinder electron variation which shows potential in revealing direct water injection process. For better understanding of unprecedented augment of ion current signal under direct water injection within internal combustion Rankine cycle engine, a chemical kinetic model is established to calculate the effect of intake oxygen fraction, fuel quantity, initial temperature and residual water vapor on in-cylinder electron formation based on GRI Mech 3.0 and ion current skeleton mechanism. The simulation results indicate direct water injection process show significant impact on in-cylinder electron formation through chemical interactions between H2O and other intermedia species including HO2, O2, CH3 and H, these reactions provides additional OH radical for propane oxidation facilitation, which result in large portion of CH radical formation and therefore, lead to higher in-cylinder electron generation. The initial temperature plays a vital role in determining whether residual water vapor show positive or negative effect by in-cylinder temperature coordination of direct water injection. Results of this work can be used to explain phenomenon related to direct water injection and ion current signal variation under both internal combustion Rankine cycle or traditional petrol engine.

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Section: Discussionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Chemical kinetic analysis of in-cylinder ion current generation under direct water injection within internal combustion Rankine cycle engine

et al. 2022

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“…Silindir içi basıncın anlık ölçülmesi amacıyla bir adet KİSTLER marka silindir içi basınç sensörü ve bir adet de sensör yükselticisi kullanılmıştır. İçten yanmalı motorlar üzerine yapılan çalışmalarda silindir içi basıncın ölçülmesi işleminde KİSTLER Piezo dirençli sensörlerin kullanıldığı birçok çalışma mevcuttur [13][14][15][16]. Silindir içi basınç sensörünün özellikleri Tablo 2'de verilmiştir.…”

Section: Silindir Içi Basınç öLçümüunclassified

Düşük Güçte Bir Motor Test Düzeneği Kurulumu ve Örnek Bir Uygulama Gerçekleştirilmesi

Özer

Akçay

Yılmaz

et al. 2020

Bitlis Eren Üniversitesi Fen Bilimleri Dergisi

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Öz İçten yanmalı motorların test edilmesi işleminde genellikle ithalat yoluyla temin edilen, oldukça yüksek maliyetli motor test dinamometreleri kullanılmaktadır. Bu çalışmanın amacı, oldukça yüksek maliyetli olan içten yanmalı motor test dinamometreleri yerine, tek silindirli dizel motorlu bir jeneratörün motor test düzeneğine dönüştürülmesi ile düşük maliyetli bir içten yanmalı motor test düzeneği elde etmektir. Elde edilen düzenekte viskozitesi toluen ile iyileştirilmiş olan fuel-oil kullanılarak motor performansına etkileri incelenmiştir. Bu çalışma kapsamında 10 HP güce ve 3000 d/d sabit devire sahip dizel motorlu jeneratör kullanılmıştır. Dizel motorun yüklenmesi işlemi jeneratöre alıcı bağlanması ile gerçekleştirilmiştir. Motorun gücü ve her bir krank mili açısı için silindir içi basıncı, yakıt hattı basıncı anlık olarak gözlenmiş ve kaydedilmiştir. Dizel ve dizel+fuel-oil karışımları kullanılarak gerçekleştirilen deneylerde, fuel-oil katkısı ile silindir içi basınç değerinin düştüğü, yakıt tüketiminin ve egzoz gazı sıcaklığının arttığı görülmüştür.

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“…Wittek et al [25] investigated experimentally the potential of variable compression ratio (VCR) technology in a 3-cylinder, direct injection turbocharged SI engine fueled with regular road octane number (RON) 95 gasoline. They applied a 2-stage variable compression ratio system to a series engine.…”

Section: Introductionmentioning

confidence: 99%

Effects of Compression Ratio of Bio-Fueled SI Engines on the Thermal Balance and Waste Heat Recovery Potential

et al. 2021

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In internal combustion engines, a significant share of the fuel energy is wasted via the heat losses. This study aims to understand the heat losses and analyze the potential of the waste heat recovery when biofuels are used in SI engines. A numerical model is developed for a single-cylinder, four-stroke and air-cooled SI engine to carry out the waste heat recovery analysis. To verify the numerical solution, experiments are first conducted for the gasoline engine. Biofuels including pure ethanol (E100), E15 (15% ethanol) and E85 (85% ethanol) are then studied using the validated numerical model. Furthermore, the exhaust power to heat loss ratio (Q˙ex/Q˙ht) is investigated for different compression ratios, ethanol fuel content and engine speed to understand the exhaust losses potential in terms of the heat recovery. The results indicate that heat loss to brake power ratio (Q˙ht/W˙b) increases by the increment in the compression ratio. In addition, increasing the compression ratio leads to decreasing the Q˙ex/Q˙ht ratio for all studied fuels. According to the results, there is a direct relationship between the ethanol in fuel content and Q˙ex/Q˙ht ratio. As the percentage of ethanol in fuel increases, the Q˙ex/Q˙ht ratio rises. Thus, the more the ethanol in the fuel and the less the compression ratio, the more the potential for the waste heat recovery of the IC engine. Considering both power and waste heat recovery, the most efficient fuel is E100 due to the highest brake thermal efficiency and Q˙ex/Q˙ht ratio and E85, E15 and E00 (pure gasoline) come next in the consecutive orders. At the engine speeds and compression ratios examined in this study (3000 to 5000 rpm and a CR of 8 to 11), the maximum efficiency is about 35% at 5000 rpm and the compression ratio of 11 for E100. The minimum percentage of heat loss is 21.62 happening at 5000 rpm and the compression ratio of 8 by E100. The minimum percentage of exhaust loss is 35.8% happening at 3000 rpm and the compression ratio of 11 for E00. The most Q˙ex/Q˙ht is 2.13 which is related to E100 at the minimum compression ratio of 8.

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Experimental investigation of a variable compression ratio system applied to a gasoline passenger car engine

Cited by 29 publications

References 12 publications

Chemical kinetic analysis of in-cylinder ion current generation under direct water injection within internal combustion Rankine cycle engine

Chemical kinetic analysis of in-cylinder ion current generation under direct water injection within internal combustion Rankine cycle engine

Düşük Güçte Bir Motor Test Düzeneği Kurulumu ve Örnek Bir Uygulama Gerçekleştirilmesi

Effects of Compression Ratio of Bio-Fueled SI Engines on the Thermal Balance and Waste Heat Recovery Potential

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