A Six-Stroke DI Diesel Engine Under Dual Fuel Operation

Hayasaki, Tsunaki; Okamoto, Yuichirou; Amagai, Kenji; Arai, Masataka

doi:10.4271/1999-01-1500

Cited by 11 publications

(7 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Bahan bakar akan disemprotkan pada langkah kompresi kedua. Hayasaki, et al [7], menambahkan dua langkah kerja pada motor diesel injeksi langsung, yang terdiri dari satu langkah isap, dua langkah kompresi, dua langkah kerja, dan satu langkah buang. Pada akhir langkah kompresi yang kedua, diinjeksikan bahan bakar methanol dengan tujuan menurunkan kadar emisi NO dan menurunkan jumlah konsumsi bahan bakar.…”

Section: Pendahuluanunclassified

“…Langkah buang ( akhir langkah buang terjadi proses injeksi air) 5) Langkah kerja/ekspansi 2 6) Langkah buang Pada akhir langkah ekspansi piston (3) mencapai titik mati bawah, selanjutnya piston bergerak menuju titik mati atas sehingga gas buang hasil pembakaran akan terbuang dan sebelum akhir langkah buang katup buang akan tertutup sehingga gas buang terkompresi kembali / kompresi 2 (5). Pada akhir langkah kompresi kedua, air diinjeksikan ke ruang bakar (6) dengan gas buang didalamnya yang bertemperatur tinggi, mengakibatkan air menguap dan volumenya meningkat, sehingga terjadi langkah ekspansi yang kedua (7). Menurut Severiano et al [9] kekurangan pada sistem injeksi air adalah terjadinya korosi pada komponen yang dialiri oleh air.…”

Section: Gambarunclassified

See 1 more Smart Citation

Pengaruh Penambahan Langkah Kerja terhadap Unjuk Kerja Motor Bakar

Gunawan

Siswanto

Yuliati

2019

JRM

View full text Add to dashboard Cite

The duration of fuel-air diffusion in the 4 stroke combustion engine is relatively short, which is 0.02 seconds at 3000 rpm so that at high rotation the level of homogeneity of the fuel-air mixture becomes low. The addition of steps in a 4 stroke combustion engine to a 6 stroke combustion engine is expected to increase the duration of mass diffusion and temperature in the air-fuel mixture. So that the homogeneity of the air-fuel mixture increase and more expansion power of the combustion results. Engine performance testing by reducing the engine speed of 400 rpm at the initial condition of the throttle valve opening by 30% then the results of the performance of the two motors will be compared. The test results show an increase in power and torque in a 6 stroke combustion engine compared to a 4 stroke combustion engine at the same rotation conditions of 15%. As for the value of the specific fuel consumption effective (SFCe), thermal efficiency, and exhaust gas emissions of Hydrocarbon (HC) 4 stroke fuel is still better.

show abstract

Section: Pendahuluanunclassified

Section: Gambarunclassified

Pengaruh Penambahan Langkah Kerja terhadap Unjuk Kerja Motor Bakar

Gunawan

Siswanto

Yuliati

2019

JRM

View full text Add to dashboard Cite

show abstract

“…Air from the atmosphere is injected into the cylinder block after the fourth stroke. Due to the thermal expansion, air expands thus producing crankshaft work [7]. One significant advantage was that the air could be expelled into the atmosphere.…”

Section: Air As the Secondary Working Fluidmentioning

confidence: 99%

Six Stroke Engine Using Gasoline and R-123

Sukesh¹

2014

IJRET

View full text Add to dashboard Cite

In any Internal Combustion Engine, only 35% of the available energy is converted into the crankshaft energy. The remaining portion of the energy is either expelled into the atmosphere or it increases the temperature of the engine block. This is desirable as the conversion of heat energy into mechanical energy is more efficient at higher temperatures. However, beyond a certain limit it sets up thermal stresses and in extreme cases it causes engine seizing. Thus a cooling system is employed to remove this heat and transfer it into the atmosphere with the help of a radiator or a heat exchanger. In a six stroke engine, this heat transferred by the coolant is reduced. As there have been several advancements in the recovery of energy from exhaust gases such as turbochargers, Thermoelectric Generators and other such techniques, energy recovery by adding two strokes with a working fluid as a refrigerant is unique. The study shows that around 30% of the heat is carried away by the coolant and hence this is amount of energy that can theoretically be harvested. Since this offers a superior cooling system, the chances of detonation is also considerably lowered. By reducing the amount of heat expelled into the atmosphere, the overall efficiency is improved. In today's age of rapidly depleting natural resources (fossil fuels), it is of utmost importance to converse these non-renewable sources of energy. Since the IC Engine has reached a state of saturation, waste heat recovery is the best way to improve the efficiency and hence reduce the fuel consumption.

show abstract

“…Another method to improve part-load efficiency is the skip-cycle strategy, also known as the skip-fire strategy, as investigated in [36][37][38][39]. With that method, one or more additional engine revolutions are executed after the regular four strokes, which leads to a lower frequency, but an increased load for each combustion instance.…”

Section: Introductionmentioning

confidence: 99%

Increased Internal Combustion Engine Efficiency with Optimized Valve Timings in Extended Stroke Operation

et al. 2021

View full text Add to dashboard Cite

Spark-ignited internal combustion engines are known to exhibit a decreased brake efficiency in part-load operation. Similarly to cylinder deactivation, the x-stroke operation presented in this paper is an adjustable form of skip-cycle operation. It is an effective measure to increase the efficiency of an internal combustion engine, which has to be equipped with a variable valve train to enable this feature. This paper presents an optimization procedure for the exhaust valve timings applicable to any valid stroke operation number greater than four. In the first part, the gas spring operation, during which all gas exchange valves are closed, is explained, as well as how it affects the indicated efficiency and the blow-by mass flow. In the second part, a simulation model with variable valve timings, parameterized with measurement data obtained on the engine test, is used to find the optimal valve timings. We show that in 12-stroke operation and with a cylinder load of 5 Nm, an indicated efficiency of 34.3% is achieved. Preloading the gas spring with residual gas prevents oil suction and thus helps to reduce hydrocarbon emissions. Measurements of load variations in 4-, 8-, and 12-stroke operations show that by applying an x-stroke operation, the indicated efficiency remains high and the center of combustion remains optimal in the range of significantly lower torque outputs.

show abstract

A Six-Stroke DI Diesel Engine Under Dual Fuel Operation

Cited by 11 publications

References 7 publications

Pengaruh Penambahan Langkah Kerja terhadap Unjuk Kerja Motor Bakar

Pengaruh Penambahan Langkah Kerja terhadap Unjuk Kerja Motor Bakar

Six Stroke Engine Using Gasoline and R-123

Increased Internal Combustion Engine Efficiency with Optimized Valve Timings in Extended Stroke Operation

Contact Info

Product

Resources

About