Control-oriented multi-phase combustion model for biodiesel fueled engines

Zhao, Junfeng; Wang, Junmin

doi:10.1016/j.apenergy.2013.03.001

Cited by 12 publications

(3 citation statements)

References 27 publications

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“…They performed the study for different nozzle geometries and confirmed that cavitation growth could not happen in tapered nozzles even at high fuel injection pressures. There are studies [23][24][25][26][27], which compare simulation results and experimental results for diesel and biodiesel sprays or their in-nozzle flow patterns. There is hardly any study reporting simulation of fuel flow in the injector's nozzle and evaluation of its effects on spray characteristics experimentally.…”

Section: Introductionmentioning

confidence: 99%

In-nozzle flow and spray characteristics for mineral diesel, Karanja, and Jatropha biodiesels

et al. 2015

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Section: Introductionmentioning

confidence: 99%

In-nozzle flow and spray characteristics for mineral diesel, Karanja, and Jatropha biodiesels

et al. 2015

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“…However, the ECUs in conventional engines are designed with careful and laborious calibrations for regular diesel fuel. Naturally, if biodiesel blend is added to the tank while the ECU is not aware of, the engine performance may degrade or even deteriorate [1], [2]. To achieve optimal combustion and minimum emissions, the future biodiesel vehicles should equip with an online fuel property identification system, which is able to identify fuel types, so that the engine control strategies can be adjusted accordingly.…”

Section: Adaptive Observer For Joint Estimation Of Oxygen Fractions Amentioning

confidence: 99%

Adaptive Observer for Joint Estimation of Oxygen Fractions and Blend Level in Biodiesel Fueled Engines

Zhao

Wang

2015

IEEE Trans. Contr. Syst. Technol.

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In this paper, a dynamic oxygen fraction model for a biodiesel-compatible engine with a dual-loop exhaust gas recirculation (EGR) system is developed. When oxygenated fuel is applied in an engine, the intake manifold oxygen fraction, which is an important factor for both combustion and emissions, can be chosen as a new reference for evaluating the equivalent EGR level instead of EGR ratio. Based on this model, an adaptive observer is designed, and it is able to simultaneously estimate the oxygen fraction states and unknown fuel blend level. The adaptive observer introduced here is advantageous for its simple convergence condition and its efficient implementation. The analysis of the observer's convergence and robustness is detailed. The performance of the observer is validated by the simulation and experimental results. The difference of intake oxygen fractions between pure diesel (B0) and pure soybean biodiesel (B100) are studied. The adaptive observer is expected to be valuable for adaptive control of the combustion and emissions of biodiesel-compatible engines.

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“…Yang et al [16] have shown that the cylinder pressure, especially in its peak point is significantly higher for pure diesel in comparison to neat biodiesel. The claim has been restated by Zhao et al [17]; they show that biodiesel has a shorter ignition delay at any operating condition, which decreases by injected fuel amount increment [17]. Some researcher claim that biodiesel percentage growth in diesel fuel blend increases the kinematic viscosity and surface tension, which causes bigger droplets in the fuel atomization process [18,19].…”

Section: Introductionmentioning

confidence: 99%

Time–Frequency Analysis of Diesel Engine Noise Using Biodiesel Fuel Blends

et al. 2021

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In recent years, biodiesel has been demonstrated to offer a suitable level of reliability and attracted the attention of many researchers. Accordingly, various studies have been carried out to account for the biodiesel production and application, producing valuable reports and findings. In this research study, the effects of biodiesel on engine noise were studied on the basis of a time–frequency analysis. To do so, the acquired acoustic signal was initially filtered and denoised. Then the signal was transferred to the time–frequency SPL domain using short-time Fourier transform. In the A weighted signal, the SPL of all treatments were compared using an innovative visual technique. In this novel approach, the values of area percentages of the obtained SPL in the time–frequency domain were used to compare the propagated noise due to variables. The method revealed a consistent trend for all fuel blends at all engine rotational speeds. The analysis results showed that B10 (10% methyl/ethyl ester and 90% diesel fuel) and B30 had the lowest and highest A-Weighted SPL, respectively. Additionally, it was found that the engine had a maximum sensitivity for all fuel blends at an engine rotation speed of 1600 RPM. Moreover, Z-weighted (linear) signal processing was used to investigate what happens in a complete thermodynamic cycle at 1600 RPM. The developed time–frequency methodology successfully exposed all of the important acoustic events of the engine. The results of this study showed that the most effective acoustic events in engine noise were combustion, piston slap, and outlet valve closing. Furthermore, higher percentages of biodiesel blends resulted in longer combustion duration.

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Control-oriented multi-phase combustion model for biodiesel fueled engines

Cited by 12 publications

References 27 publications

In-nozzle flow and spray characteristics for mineral diesel, Karanja, and Jatropha biodiesels

In-nozzle flow and spray characteristics for mineral diesel, Karanja, and Jatropha biodiesels

Adaptive Observer for Joint Estimation of Oxygen Fractions and Blend Level in Biodiesel Fueled Engines

Time–Frequency Analysis of Diesel Engine Noise Using Biodiesel Fuel Blends

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