The Investigation of a High Proportion of N-butanol Blended Fuels on Ignition Timing

Bioetanol merupakan bahan bakar nabati yang diformulasikan untuk kendaraan bermotor. Dalam penerapan bioetanol di motor bakar, memerlukan beberapa modifikasi pada mesin yang akan dipakai seperti mengubah waktu pengapian, mengubah durasi injeksi, mengubah rasio kompresi, dan memodifikasi sistem pemasukan bahan bakar mesin. Dengan demikian, diharapkan terjadi peningkatan terhadap hasil unjuk kerja engine. Penelitian ini difokuskan pada mesin Honda CB150R dengan diawali melakukan setting pada ECU programmable. Setelah itu pengujian penginjeksian bahan bakar untuk mencapai AFR Bioetanol E50 dengan persentase penginjeksian sebesar 100, 125, 150, 175 dan 200 persen dari jumlah penginjeksian bahan bakar standar. Kemudian dilakukan pengujian dengan penggunaan Pertamax (bioetanol 0%) pada kondisi standar sebagai kelompok kontrol dan penggunaan Bioetanol E50 dengan variasi ignition timing sebagai kelompok uji dengan mengambil 4 variasi advance ignition timing 16°, 20°,24° dan 28° BTDC pada rasio kompresi yang telah dirubah menjadi 12, 12,5, dan 13. Dari penelitian ini didapatkan mapping durasi injeksi yang tepat pada putaran 2000 hingga 4000 rpm adalah 150%, sedangkan pada putaran 5000 hingga 8000 rpm, durasi terbaik 125%. Sedangkan untuk mapping waktu pengapian didapatkan pada rentang 16° dan 20° BTDC untuk rasio kompresi 12, 12,5, dan 13. Berdasarkan hasil afr E0 ecu programable pada rasio kompresi 11 didapatkan nilai rata – rata sebesar 13,154 yang berarti kondisi campuran udara dan bahan bakar berada di bawah afr stoikiometri yaitu 14,7. Sedangkan untuk hasil afr E50 ecu programable pada rasio kompresi 11 didapatkan nilai sebesar rata – rata 11,160 yang berarti kondisi campuran udara dan bahan bakar berada di bawah afr stoikiometri yaitu 12,6. Hal tersebut menunjukan bahwa engine Honda CB150R beroperasi pada afr di bawah stoikiometri dari bahan bakar yang digunakan. Sehingga engine Honda CB150R memiliki karakteristik daya menjadi meningkat dan tidak terjadi detonasi, akan tetapi nilai waktu konsumsi bahan bakar akan menurun serta emisi CO dan HC meningkat

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Estimating the urban environmental impact of gasoline-ethanol blended fuels in a passenger vehicle engine

Environmental Science and Pollution Research ◽

10.1007/s11356-021-13432-5 ◽

2021 ◽

Author(s):

Gilson Tristão Duarte ◽

Irenilza de Alencar Nääs ◽

Nilsa Duarte da Silva Lima

Keyword(s):

Environmental Impact ◽

Passenger Vehicle ◽

Vehicle Engine ◽

Blended Fuels

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A Comparison of Ethanol, Methanol, and Butanol Blending with Gasoline and Its Effect on Engine Performance and Emissions Using Engine Simulation

Processes ◽

10.3390/pr9081322 ◽

2021 ◽

Vol 9 (8) ◽

pp. 1322

Author(s):

Simeon Iliev

Keyword(s):

Alternative Fuels ◽

Fossil Fuels ◽

Gasoline Engine ◽

Engine Performance ◽

Exhaust Emissions ◽

Engine Simulation ◽

Engine Model ◽

Fuel Blends ◽

Performance And Emissions ◽

Blended Fuels

Air pollution, especially in large cities around the world, is associated with serious problems both with people’s health and the environment. Over the past few years, there has been a particularly intensive demand for alternatives to fossil fuels, because when they are burned, substances that pollute the environment are released. In addition to the smoke from fuels burned for heating and harmful emissions that industrial installations release, the exhaust emissions of vehicles create a large share of the fossil fuel pollution. Alternative fuels, known as non-conventional and advanced fuels, are derived from resources other than fossil fuels. Because alcoholic fuels have several physical and propellant properties similar to those of gasoline, they can be considered as one of the alternative fuels. Alcoholic fuels or alcohol-blended fuels may be used in gasoline engines to reduce exhaust emissions. This study aimed to develop a gasoline engine model to predict the influence of different types of alcohol-blended fuels on performance and emissions. For the purpose of this study, the AVL Boost software was used to analyse characteristics of the gasoline engine when operating with different mixtures of ethanol, methanol, butanol, and gasoline (by volume). Results obtained from different fuel blends showed that when alcohol blends were used, brake power decreased and the brake specific fuel consumption increased compared to when using gasoline, and CO and HC concentrations decreased as the fuel blends percentage increased.

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An experimental study on optimal spark timing control for improved performance of a flex fuel vehicle engine

Proceedings of the Institution of Mechanical Engineers Part D Journal of Automobile Engineering ◽

10.1177/0954407019869773 ◽

2019 ◽

Vol 234 (5) ◽

pp. 1294-1303

Author(s):

Junsang Yoo ◽

Taeyong Lee ◽

Pyungsik Go ◽

Yongseok Cho ◽

Kwangsoon Choi ◽

...

Keyword(s):

Empirical Equation ◽

Interpolation Method ◽

Linear Interpolation ◽

Combustion Characteristics ◽

Combustion Stability ◽

Timing Control ◽

Vehicle Engine ◽

Spark Timing ◽

Linear Interpolation Method ◽

Blended Fuels

In the American continent, the most frequently used alternative fuel is ethanol. Especially in Brazil, various blends of gasoline–ethanol fuels are widely spread. The vehicle using blended fuel is called flexible fuel vehicle. Because of several selections for the blending ratios in gas stations, the fuel properties may vary after refueling depending on a driver’s selection. Also, the combustion characteristics of the flexible fuel vehicle engine may change. In order to respond to the flexible fuel vehicle market in Brazil, a study on blended fuels is performed. The main purpose of this study is to enhance performance of the flexible fuel vehicle engine to target Brazilian market. Therefore, we investigated combustion characteristics and optimal spark timings of the blended fuels with various blending ratios to improve the performance of the flexible fuel vehicle engine. As a tool for prediction of the optimal spark timing for the 1.6L flexible fuel vehicle engine, the empirical equation was suggested. The validity of the equation was investigated by comparing the predicted optimal spark timings with the stock spark timings through engine tests. When the stock spark timings of E0 and E100 were optimal, the empirical equation predicted the actual optimal spark timings for blended fuels with a good accuracy. In all conditions, by optimizing spark timing control, performance was improved. Especially, torque improvements of E30 and E50 fuels were 5.4% and 1.8%, respectively, without affecting combustion stability. From these results, it was concluded that the linear interpolation method is not suitable for flexible fuel vehicle engine control. Instead of linear interpolation method, optimal spark timing which reflects specific octane numbers of gasoline–ethanol blended fuels should be applied to maximize performance of the flexible fuel vehicle engine. The results of this study are expected to save the effort required for engine calibration when developing new flexible fuel vehicle engines and to be used as a basic strategy to improve the performance of other flexible fuel vehicle engines.

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