Temperature and air–fuel ratio dependent specific heat ratio functions for lean burned and unburned mixture

Ceviz, Mehmet Akif; Kaymaz, İrfan

doi:10.1016/j.enconman.2004.12.009

Cited by 66 publications

(43 citation statements)

References 11 publications

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“…Thermo-physical gas properties Thermo-physical gas properties are calculated based on the thermodynamic data in the JANAF tables [54] and Burcat's Thermodynamic Database [55], along with a 15-species equilibrium model. This approach avoids potential shortcomings associated with simple correlations for specific heat ratio, c, commonly used in heat release analysis [11,12,16,[56][57][58][59]. The species included in the gas properties routines are: H, O, N, H 2 , OH, CO, NO, O 2 , H 2 O, CO 2 , N 2 , Ar, NO 2 , HO 2 and fuel.…”

Section: Appendix a Supporting Methods In Ace-hramentioning

confidence: 99%

Enhanced heat release analysis for advanced multi-mode combustion engine experiments

et al. 2014

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Section: Appendix a Supporting Methods In Ace-hramentioning

confidence: 99%

Enhanced heat release analysis for advanced multi-mode combustion engine experiments

et al. 2014

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“…The ratio of the heat engine specifications [12] could affect the AFR. AFR can affect exhaust emissions [13] on certain conditions to reduce exhaust gas emissions coupled with the added ingredient [14] [15].…”

Section: Introductionmentioning

confidence: 99%

Smart controller design of air to fuel ratio (AFR) and brake control system on gasoline engine

Triwiyatno

Sinuraya

Setiawan

et al. 2015

2015 2nd International Conference on Information Technology, Computer, and Electrical Engineering (ICITACEE)

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Development of internal combustion engine control system is currently oriented on exhaust emissions, performance and fuel efficiency. This is caused by fuel prices rising which led to a crisis on the transport sector; therefore it is crucial to develop a fuel-efficient vehicles technology. Gasoline engine fuel efficiency can be improved by several methods such as by controlling the air-to-fuel ratio (AFR). AFR technology currently still has many problems due to its difficulty setting characteristic since AFR control is usually as internally engine control. Fuel efficiency can be improved by influence of external engine system. Brake control system is an external engine system that used in this research. The purpose of this research is to design and implement the AFR and brake control system in a vehicle to improve fuel efficiency of gasoline engines along braking period. The basic idea is the controller has to reduce the consumption of fuel injection along braking period. The applied control system on vehicle works using smart controller, such as Fuzzy Logic Controller (FLC). When the vehicle brakes, fuel injection is controlled by the ECU brake control system. This control system works in parallel with the vehicle control system default. The results show, when the engine speed exceeds 2500 rpm, AFR value increased infinitely, so that maximum efficiency is achieved. At engine speed less than 2500 rpm, AFR value reaches a value of 22. The fuel measurement has been able to show a decrease in fuel consumption of 6 liters to 4 liters within the distance of 50.7 km. Improvement of fuel efficiency can be achieved by approximately of 33.3%.

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“…(4) It is assumed that the sufficient combustion process happens in the gasoline engine cylinders and all the reactants convert to the products via the combustion. Then the corresponding chemical reaction can be described as ( [30,31]): 2C 8 H 18 + 25O 2 Ñ 16CO 2 + 18H 2 O. Therefore, the properties of the post-combustion mixture will be considered and used in the relevant simulation study.…”

Section: Recovering Exhaust Energy Using An Unmodified Scroll Expandermentioning

confidence: 99%

Feasibility Study of a Scroll Expander for Recycling Low-Pressure Exhaust Gas Energy from a Vehicle Gasoline Engine System

et al. 2016

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Abstract:The growing number of vehicles on the road has led to a rapid increase in fuel consumption and toxic gas emissions, so the challenges in fuel efficiency improvement and reduction of CO 2 and NO x emissions have always been on the top agenda of the automotive industry. The paper presents a feasibility study of recovering the low-pressure exhaust gas energy via by-pass connection of a scroll expander to the engine system exhaust. The paper starts with the description of the proposed new exhaust energy recycling scheme and the mathematical modelling of the system. A feasibility study is carried out to investigate whether this new scheme can work with the engine operation conditions specified by the engine test data. The initial study indicated that the scroll expander structure needs to be modified; otherwise, it cannot be used for exhaust energy recovery. The experimental test and simulation results presented in this paper indicate that it is feasible to recover the low-pressure exhaust gas energy using a scroll expander with a modified structure. The proposed energy recovery system has the potential to produce over 400 W power output with over 90% of engine exhaust flow recycling.

show abstract

Temperature and air–fuel ratio dependent specific heat ratio functions for lean burned and unburned mixture

Cited by 66 publications

References 11 publications

Enhanced heat release analysis for advanced multi-mode combustion engine experiments

Enhanced heat release analysis for advanced multi-mode combustion engine experiments

Smart controller design of air to fuel ratio (AFR) and brake control system on gasoline engine

Feasibility Study of a Scroll Expander for Recycling Low-Pressure Exhaust Gas Energy from a Vehicle Gasoline Engine System

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