Real emissions, driving patterns and fuel consumption of in-use diesel buses operating at high altitude

Giraldo, Michael; Huertas, José Ignacio

doi:10.1016/j.trd.2019.10.004

Cited by 69 publications

(30 citation statements)

References 31 publications

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“…The results obtained follow the same trends of the values presented in previous investigations carried out by [19,28,29] on the formation of NOx and CO, and the registered data obtained by [15,30] on soot emissions regarding the variation of environmental conditions at different altitudes. As general trends, it can be observed that the increase in temperature has a great influence on the specific emissions of the three pollutants considered.…”

Section: Sensitivity Coefficient For Other Emissionssupporting

confidence: 88%

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Influence of Environmental Changes Due to Altitude on Performance, Fuel Consumption and Emissions of a Naturally Aspirated Diesel Engine

2021

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The present study shows the effects of environmental conditions (atmospheric temperature, pressure and relative humidity) due to altitude changes on performance, fuel consumption and emissions in a naturally aspirated diesel engine. Due to changes in altitude, the atmospheric conditions are altered, mainly the air density, associated to hydrostatic pressure, temperature profile and humidity and relative nitrogen/oxygen ratio, thus modifying the engine intake conditions. The study considers changes in altitude from sea level to 2500 m above sea level, which are representative of the orographic conditions in Ecuador. As a main part of this research, a parametric study of variation of atmospheric temperature, pressure and relative humidity is carried out in AVL BOOST™, showing the effects on mean effective pressure, fuel consumption and specific pollutant emissions (CO2, NOx, CO and soot). The study considers effects at regional level (change from an altitude to another) and local level (changes in the atmospheric conditions due to local anticyclone or storm, temperature and humidity). The quantitative effects are expressed in the form of sensitivity coefficients, e.g., relative change in an engine output variable due to the change in atmospheric pressure, temperature or humidity. In addition, several global correlations have been obtained to provide analytical expressions to summarize all results obtained, showing the separate effect of pressure and temperature on each engine performance variable.

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Section: Sensitivity Coefficient For Other Emissionssupporting

confidence: 88%

Section: Sensitivity Coefficient For Other Emissionssupporting

confidence: 88%

Influence of Environmental Changes Due to Altitude on Performance, Fuel Consumption and Emissions of a Naturally Aspirated Diesel Engine

2021

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“…We recommend the second alternative, which nowadays can be obtained through third companies that provide this service using telematic systems. A detailed description of the measurement of fuel/energy consumption can be found in [41][42][43].…”

Section: Environmental Impactmentioning

confidence: 99%

“…The technique used for measuring these emissions, together with the criteria selected for the vehicles sample and measurement conditions, has a great impact on the representativeness of the emissions obtained in each city or country. The most common methodologies to measure on-road emissions can be synthetized in two categories [44]: (i) Fleet-basis emissions techniques, such as Tunnel studies [45], and (ii) Individual-basis emissions techniques such as RSD [46] and Portable Emissions Measurement System (PEMS) [42]. When assessing sustainable mobility in a region, it would be desirable to measure the vehicles under representative driving conditions using the most accurate technology available (e.g., PEMS).…”

Section: Environmental Impactmentioning

confidence: 99%

Methodology to Assess Sustainable Mobility in LATAM Cities

et al. 2021

Self Cite

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As the first step toward implementing strategies to improve mobility in urban centers, governmental authorities must assess their present situation in order to identify the most effective actions that should be included in their short and long-term plans. However, there is not a well-established methodology to carry out such an assessment. The already existing ones are subjective, incomplete, costly, and hard to implement, especially for the case of Latin American (LATAM) countries. This paper proposes a comprehensive methodology to carry out this assessment. It uses recent advances in information technologies and includes the use of web map services, telematics data, and low-cost vehicle emission tests. As an example of application, a mobility assessment was carried out for Saltillo, a medium-sized city in northeastern Mexico, which is considered a typical city in LATAM countries. Results indicate that this methodology can be replicated at a low incremental cost and that it leads towards the identification of the most sustainable (economic, environmental, and social) actions that should be implemented in these cities considering their local circumstances.

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“…Therefore, it is necessary to research the performance and in-cylinder heat accumulation and dissipation of diesel engine working at plateau. There are some other researchers studying diesel engine working at plateau, the main focus of these articles are combustion and emission characteristics [26], effects of altitudes [27], two-stage turbocharging system [28], and altitude adaptability of turbocharging [29].…”

Section: Introductionmentioning

confidence: 99%

A RBFNN & GACMOO-Based Working State Optimization Control Study on Heavy-Duty Diesel Engine Working in Plateau Environment

Dong¹,

Liu²,

Liu³

et al. 2020

Energies

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In order to solve issues concerning performance induction and in-cylinder heat accumulation of a certain heavy-duty diesel engine in a plateau environment, working state parameters and performance indexes of diesel engine are calculated and optimized using the method of artificial neural network and genetic algorithm cycle multi-objective optimization. First, with an established diesel engine simulation model and an orthogonal experimental method, the influence rule of five performance indexes affected by five working state parameters are calculated and analyzed. Results indicate the first four of five working state parameters have a more prominent influence on those five performance indexes. Subsequently, further calculation generates correspondences among four working state parameters and five performance indexes with the method of radial basis function neural network. The predicted value of the trained neural network matches well with the original one. The approach can fulfill serialization of discrete working state parameters and performance indexes to facilitate subsequent analysis and optimization. Next, we came up with a new algorithm named RBFNN & GACMOO, which can calculate the optimal working state parameters and the corresponding performance indexes of the diesel engine working at 3700 m altitude. At last, the bench test of the diesel engine in a plateau environment is employed to verify accuracy of the optimized results and the effectiveness of the algorithm. The research first combined the method of artificial neural network and genetic algorithm to specify the optimal working state parameters of the diesel engine at high altitudes by focusing on engine power, torque and heat dissipation, which is of great significance for improving both performance and working reliability of heavy-duty diesel engine working in plateau environment.

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Real emissions, driving patterns and fuel consumption of in-use diesel buses operating at high altitude

Cited by 69 publications

References 31 publications

Influence of Environmental Changes Due to Altitude on Performance, Fuel Consumption and Emissions of a Naturally Aspirated Diesel Engine

Influence of Environmental Changes Due to Altitude on Performance, Fuel Consumption and Emissions of a Naturally Aspirated Diesel Engine

Methodology to Assess Sustainable Mobility in LATAM Cities

A RBFNN & GACMOO-Based Working State Optimization Control Study on Heavy-Duty Diesel Engine Working in Plateau Environment

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