Air-fraction modeling for simultaneous Diesel engine NOx and PM emissions control during active DPF regenerations

Chen, Pingen; Wang, Junmin

doi:10.1016/j.apenergy.2014.02.031

Cited by 63 publications

(17 citation statements)

References 31 publications

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“…Researchers have made substantial efforts to develop new technology to address this problem, such as reducing the PM exhaust emissions by using diesel particulate filters (DPF) or alternative fuels [11,12], and reducing the NOx emissions by using selective catalytic reduction (SCR) [13][14][15] or exhaust gas recirculation (EGR) [16]. These treatment systems can effectively solve this problem, however, they reduce the diesel engine's advantages in fuel economy, and the complex settings are very expensive [17].…”

Section: Introductionmentioning

confidence: 99%

Application of Canola Oil Biodiesel/Diesel Blends in a Common Rail Diesel Engine

Yoon²,

Kim

et al. 2016

Applied Sciences

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Abstract:In this study, the application effects of canola oil biodiesel/diesel blends in a common rail diesel engine was experimentally investigated. The test fuels were denoted as ULSD (ultra low sulfur diesel), BD20 (20% canola oil blended with 80% ULSD by volume), and PCO (pure canola oil), respectively. These three fuels were tested under an engine speed of 1500 rpm with various brake mean effective pressures (BMEPs). The results indicated that PCO can be used well in the diesel engine without engine modification, and that BD20 can be used as a good alternative fuel to reduce the exhaust pollution. In addition, at low engine loads (0.13 MPa and 0.26 MPa), the combustion pressure of PCO is the smallest, compared with BD20 and ULSD, because the lower calorific value of PCO is lower than that of ULSD. However, at high engine loads (0.39 MPa and 0.52 MPa), the rate of heat release (ROHR) of BD20 is the highest because the canola oil biodiesel is an oxygenated fuel that promotes combustion, shortening the ignition delay period. For exhaust emissions, by using canola oil biodiesel, the particulate matter (PM) and carbon monoxide (CO) emissions were considerably reduced with increased BMEP. The nitrogen oxide (NOx) emissions increased only slightly due to the inherent presence of oxygen in biodiesel.

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Section: Introductionmentioning

confidence: 99%

Application of Canola Oil Biodiesel/Diesel Blends in a Common Rail Diesel Engine

Yoon²,

Kim

et al. 2016

Applied Sciences

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“…Here, the oxygenfraction dynamics in the LEGR is ignored, and it is assumed that F 3 ≈ F 5 . This simplification is reasonable since the variation of oxygen fraction through the after treatment system is small during normal operations without active DPF regenerations [25]. The oxygen-fraction dynamics at the intake manifold can be described bẏ…”

Section: System Modelingmentioning

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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“…A schematic diagram of a typical parallel diesel–electric hybrid vehicle coupled with aftertreatment system is given in Fig. .…”

Section: System Modelingmentioning

confidence: 99%

“…A schematic diagram of a typical parallel dieselelectric hybrid vehicle [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33] coupled with aftertreatment system is given in Fig. 1.…”

Section: System Modelingmentioning

confidence: 99%

Comparative Study and Accommodation of Biodiesel in Diesel‐Electric Hybrid Vehicles Coupled with Aftertreatment Systems

Zhao

Chen

Ibrahim

et al. 2015

Asian Journal of Control

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Biodiesel is a promising renewable alternative fuel, which can be used in diesel‐electric hybrid vehicles to potentially bring one kind of clean vehicle on the road. However, the fuel property variation can cause impacts to the powertrain and aftertreatment systems. In this paper, biodiesel's influence on post‐injection effects is studied. Experimental results are obtained to demonstrate the differences between diesel and biodiesel, and to build up fuel‐dependent maps of engine torque, temperature, and emissions. Utilizing those maps, an aftertreatment warm‐up approach compatible with both fuels is developed by strategically enabling double post injections. Finally, a supervisory controller based on model predictive control method is designed to optimize and balance the tradeoff between hybrid vehicle fuel economy and tailpipe emissions. Simulations are conducted for both fuels with or without the proposed control strategy. The validation results show that for both fuels, the controller can significantly reduce tailpipe emissions by successfully regulating the catalyst temperature to the desired range sacrificing fuel economy. And for biodiesel, additional fuel cost is required in order to realize the tradeoff.

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Air-fraction modeling for simultaneous Diesel engine NOx and PM emissions control during active DPF regenerations

Cited by 63 publications

References 31 publications

Application of Canola Oil Biodiesel/Diesel Blends in a Common Rail Diesel Engine

Application of Canola Oil Biodiesel/Diesel Blends in a Common Rail Diesel Engine

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

Comparative Study and Accommodation of Biodiesel in Diesel‐Electric Hybrid Vehicles Coupled with Aftertreatment Systems

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