Sensitivity of light duty vehicle tailpipe emission rates from simplified portable emission measurement systems to variation in engine volumetric efficiency

Wei, Tongchuan; Frey, H. Christopher

doi:10.1080/10962247.2021.1923586

Cited by 7 publications

(4 citation statements)

References 51 publications

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“…On-board portable emission measuring system (PEMS) measurements are designed to measure on-road vehicle emission with real-world driving operations under a wide range of ambient conditions and vehicle mode of operation (e.g., vehicle speed). − Vehicle emissions are commonly characterized in terms of pollutant emission factors (EFs) that are defined as the amount of pollutant emitted per defined task performed (e.g., mass of fuel burned). Calculating EFs with PEMS (EF PEMS ) is considered a reliable method since it is a direct measurement of tailpipe emissions.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Relationship between Meteorological Variables and NO_x Emission Factors Based on Plume-Chasing Measurements

Xiang

Zhang

et al. 2023

ACS EST Eng.

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A relationship that links the accuracy of nitrogen oxide emission factors (NO x EFs) calculated from chasing measurements (EFchasing) to meteorological variables was developed. To quantitatively evaluate this relationship, we postulated an “effective ratio” concept based on the momentum wake theory. The effective ratio is considered a function of meteorological variables in the vehicle wake. A mobile platform was used to characterize NO x EFs by following tested vehicles that were installed with a portable emission measuring system (PEMS) on a restricted driving track. The relationship was evaluated based on 172 plume-chasing measurements that were conducted under various operating scenarios such as different tested vehicle speeds and vehicle types. Two calculation approaches (i.e., baseline vs rolling minimum) were used to calculate EFchasing and benchmark against NO x EF from PEMS (EFPEMS). A consistent positive linear relationship (slope ∼28, p < 0.01) is found between the effective ratio and the relative error of EFchasing under all operating scenarios and is independent of calculation approaches. This is evidence that the effective ratio could be a good parameter that quantifies the relative deviation of EFchasing and is independent of calculation approaches. Based on this relationship, the effective ratio can be further used to identify erroneous chasing measurements and improve the accuracy of EFchasing.

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Section: Introductionmentioning

confidence: 99%

Evaluation of the Relationship between Meteorological Variables and NO_x Emission Factors Based on Plume-Chasing Measurements

Xiang

Zhang

et al. 2023

ACS EST Eng.

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“…Finally, FTP_Highway measures a vehicle’s performance while travelling on highways at high speeds. 46 Each of these cycles has its own unique features, such as varying speeds, acceleration rates and stop-and-go patterns. The data for these cycles were taken from Dieselnet.…”

Section: Numerical Analysismentioning

confidence: 99%

Feasibility studies of micro wind turbines installed on electric vehicles as range extenders using real-time analytical simulation with multi driving cycles scenarios

Ebaid

Shahin

Alshawabkeh

2023

Advances in Mechanical Engineering

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The proposed work aims to generate electricity by utilising the air flowing around the vehicle through the micro wind turbines (MWTs). In this case, the electricity produced can be used to charge up the battery or power up additional vehicle accessories, which increases the efficiency or/and range of the vehicle. Three driving cycles have been conducted to examine the model’s performance in moderate, highly dynamic and highway driving scenarios. The analytical works resulted in an 8.38%, 4.6% and 1.01% efficiency increase for the case of the Highway driving cycle (FTP), the new European driving cycle (NEDC) and the standardisation random test aggressive driving cycle (RTS), respectively when adding the micro wind turbines model. In terms of range analysis, 16, 11 and 2 km of the range were added to the full battery charge range of the vehicle when the vehicle was simulated for the case FTP, NEDC and RTS driving cycles scenarios, respectively. The results conclude that the value of micro wind turbines is shimming with highway driving scenarios where the effect of regenerative braking is absent and the drag force acting on the vehicle is at its highest rate.

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Section: Introductionmentioning

confidence: 99%

“…On-road emissions monitoring of automotive vehicles with portable emission systems (PEMS), as well as the inclusion of new stringent regulations for NOx, particles and CO 2 pushes the automotive industry to better detect aging and combustion dispersion in the fleet in real time by improving the current On-board Diagnostics (OBD) systems with a better analysis of the combustion. 1,2 In-cylinder pressure sensors offer detailed information of the combustion process. The low frequency content of the in-cylinder pressure signal is critical to analyze the heat release rate (HRR) or the indicated mean effective pressure (IMEP), 3 while the high frequency content is used to estimate the resonance intensity.…”

Section: Introductionmentioning

confidence: 99%

In-cylinder pressure smart sampling for efficient data management

Plá

Morena

Bares

et al. 2022

International Journal of Engine Research

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The present paper proposes an optimized algorithm for minimizing the amount of data processed in order to maintain all critical information from the in-cylinder pressure sensor but with minimum computational cost. The algorithm uses singular value decomposition (SVD) for reducing the number of samples and pivoting QR decomposition to identify the optimal sampling locations. Experimental data from four engines with different combustion modes, namely Spark ignition (SI), Compression ignition (CI), turbulent jet ignition (TJI), and dual fuel ignition (DFCI), was used to validate the algorithm. The impact of the different sampling methodologies on different metrics for engine performance has been addressed and studied showing negligible information loss when reducing to 25 samples per cycle the acquisition buffer size.

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Sensitivity of light duty vehicle tailpipe emission rates from simplified portable emission measurement systems to variation in engine volumetric efficiency

Cited by 7 publications

References 51 publications

Evaluation of the Relationship between Meteorological Variables and NO_x Emission Factors Based on Plume-Chasing Measurements

Evaluation of the Relationship between Meteorological Variables and NO_x Emission Factors Based on Plume-Chasing Measurements

Feasibility studies of micro wind turbines installed on electric vehicles as range extenders using real-time analytical simulation with multi driving cycles scenarios

In-cylinder pressure smart sampling for efficient data management

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Sensitivity of light duty vehicle tailpipe emission rates from simplified portable emission measurement systems to variation in engine volumetric efficiency

Cited by 7 publications

References 51 publications

Evaluation of the Relationship between Meteorological Variables and NOx Emission Factors Based on Plume-Chasing Measurements

Evaluation of the Relationship between Meteorological Variables and NOx Emission Factors Based on Plume-Chasing Measurements

Feasibility studies of micro wind turbines installed on electric vehicles as range extenders using real-time analytical simulation with multi driving cycles scenarios

In-cylinder pressure smart sampling for efficient data management

Contact Info

Product

Resources

About

Evaluation of the Relationship between Meteorological Variables and NO_x Emission Factors Based on Plume-Chasing Measurements

Evaluation of the Relationship between Meteorological Variables and NO_x Emission Factors Based on Plume-Chasing Measurements