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Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ)

1. Triantafyllopoulos, Georgios. Assessment of technologies to reduce fuel consumption and pollutant emissions of modern passenger cars in real - world driving conditions.

Degree: 2018, Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ)

In the context of this dissertation, the fuel consumption and emissions of many vehicles were measured under various driving conditions and emission and consumption reduction technologies were investigated. The impact of conventional fuel consumption reduction technologies was simulated by modeling a gasoline and diesel vehicle under NEDC, WLTP and CADC driving cycles, using the AVL Cruise platform. The technologies tested include brake energy recuperation, start-stop, vehicle mass reduction, aerodynamic resistance reduction, rolling resistance reduction, gearbox changes and engine efficiency improvements. Each technology has a different impact on each driving cycle, while the overall reduction in fuel consumption and CO2 emissions achieved by combining all technologies was in the range of 12-14%. Concerning pollutant reduction technologies, the possibility of reducing NOx emissions of a Euro 6b diesel vehicle was studied. Initially, the vehicle was tested on the road following the RDE regulation where it emitted 5 times more NOx than the 80 mg/km limit. The vehicle’s engine operation was simulated on a laboratory dyno, where an identical engine was installed. Modifications were made to the exhaust aftertreatment system, including the replacement of the LNT system with an SCR system. The modifications reduced NOx emissions by 90%, achieving compliance with the Euro 6 limits without requiring any additional fuel consumption. The effect of driving conditions on emissions and fuel consumption was then addressed. In particular, three Euro 6 diesel vehicles were tested in the NEDC, WLTP, CADC driving cycles and on the road, on normal RDE-compliant routes and other more dynamic ones. The emissions reduction strategy of the three vehicles seems to be exclusively targeting the NEDC cycle, as at non-NEDC operating conditions the use of anti-pollution systems is minimized. WLTP emissions were closer to the emissions measured under real conditions; however, the engine operating range during the road tests was greater than the range during laboratory tests. In addition, NOx emission levels increase dramatically when driving the vehicle in a more dynamic manner outside the boundaries of the RDE regulation. Finally, on-road emissions measurements were carried out on a fleet of eight vehicles, two diesel, one gasoline, one LPG vehicle, one CNG, one hybrid and two older gasoline vehicles which had been converted to gasoline-LPG dual fuels. No fuel/engine type had low CO2, CO and NOx emissions over the full range of real world driving conditions. However, it is worth mentioning that the older gasoline-LPG vehicles had the worst emission performance, the CNG vehicle had the lowest CO2 emissions and the hybrid had the lowest CO and NOx emissions combined. With regard to conventional vehicle types, diesel vehicles had very high NOx emissions, while gasoline vehicles had extremely high CO emissions under dynamic driving conditions, reaching 35 times the regulatory limits.

Στα πλαίσια της παρούσας διατριβής αποτυπώθηκαν οι εκπομπές και…

Subjects/Keywords: Εκπομπές οξειδίου του αζώτου; Εκπομπές διοξειδίου του άνθρακα; Εκπομπές CO2; Εκπομπές NOx; Εκπομπές καυσαερίων; Μείωση εκπομπών; Ντίζελ; Εκπομπές σε πραγματικές συνθήκες οδήγησης; Κύκλος οδήγησης; RDE; CO2; NOx; Diesel; Euro 6; Vehicle emissinos; LPG; CNG; NEDC; WLTP; CADC; AVL Cruise; Fuel consumption; Emission reduction; Driving cycles

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Triantafyllopoulos, G. (2018). Assessment of technologies to reduce fuel consumption and pollutant emissions of modern passenger cars in real - world driving conditions. (Thesis). Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ). Retrieved from http://hdl.handle.net/10442/hedi/45500

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Triantafyllopoulos, Georgios. “Assessment of technologies to reduce fuel consumption and pollutant emissions of modern passenger cars in real - world driving conditions.” 2018. Thesis, Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ). Accessed March 07, 2021. http://hdl.handle.net/10442/hedi/45500.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Triantafyllopoulos, Georgios. “Assessment of technologies to reduce fuel consumption and pollutant emissions of modern passenger cars in real - world driving conditions.” 2018. Web. 07 Mar 2021.

Vancouver:

Triantafyllopoulos G. Assessment of technologies to reduce fuel consumption and pollutant emissions of modern passenger cars in real - world driving conditions. [Internet] [Thesis]. Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ); 2018. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/10442/hedi/45500.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Triantafyllopoulos G. Assessment of technologies to reduce fuel consumption and pollutant emissions of modern passenger cars in real - world driving conditions. [Thesis]. Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ); 2018. Available from: http://hdl.handle.net/10442/hedi/45500

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

2. Alexopoulos, Evangelos. Εκτίμηση επαγγελματικής και περιβαλλοντικής έκθεσης σε αρωματικούς υδρογονάνθρακες. Βενζόλιο και δείκτες βιολογικής έκθεσης.

Degree: 2002, National and Kapodistrian University of Athens; Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών (ΕΚΠΑ)

The city of Athens, as most large cities all over the world has air pollution problems. These problems were made worse by bad town layout, area geomorphology (surrounded by mountains) intense sunlight and low winds speed. Main goal of the present Thesis was to assess the exposure of inhabitants of Athens city in aromatic hydrocarbons (AH) mainly benzene, toluene and xylene by monitoring selected occupational groups. Another goal was to identify prognostic factors of personal exposure and home levels. Finally an attempt was made to assess muconic acid, a benzene metabolite, as a possible biomarker of exposure in environmental benzene levels. Conclusions were based on data collected by repeated measurements of 50 persons and their homes (six times a year), yielding 1800 values totally. In addition daily diaries during each measurement period were used. Fifty persons were chosen from the following occupational groups: teachers, students, bus drivers, postmen and traffic policemen based on the assumption that the first two groups represent low exposure groups on the contrary to the other three. Non smokers volunteers with only environmental exposure were included in the study because high levels of AH were released in cigarette smoke and consequently is a strong confounding factor. It is found that: 1. Home levels benzene varied between 6.03 to 13.35 μg/m3 in six measurements periods and result in an annual mean of 10.19 μg/m3. Personal levels varied between 13.08 to 24.63 μg/m3 and the annual mean was 18.85 μg/m3. Urban levels in city center were even higher with an annual mean of 20.4 μg/m3. According to a European Union guideline entered into force on 13/12/2000 the limit value of benzene shall not exceed 10 μg/m3. 2. Surprisingly, indoor pollution level in Athens was half of AH levels in urban environment. This is probably due to homes spreading in Athens basin (many homes were located in distance from polluted city center) and to home factors related to climate (use of non absorbent materials for wall and floor covering). The fact that personal exposure is lower than environmental concentrations of benzene is mainly due to low indoor pollution. Consequently keeping environmental limit value for benzene shall offer protection to inhabitants on the contrary to other cities where people are exposed to concentrations of benzene that may be multiple as high as the urban average. 3. The same pattern with minor deviations holds for toluene and xylenes.4. Correlation between personal and home levels was weaker for benzene compared to other hydrocarbons and for summer measurement compared to other seasons for the reason that other factors irrelevant to indoor environment have a predominant role in exposure modelling. On the contrary to benzene home levels of toluene and xylenes comprised a significant proportion of individual exposure values. Our results suggest that outdoors work give the greater contribution to benzene exposure of Athens citizens. 5. Indoor air pollution and personal exposure were closely related to…

Subjects/Keywords: Ιατρική της εργασίας; Αρωματικοί υδρογονάνθρακες; Αστική ρύπανση; Βιολογικοί δείκτες έκθεσης; Λευχαιμία; Ποιότητα αέρα εσωτερικών χώρων; Εκπομπές καυσαερίων; Ατμοσφαιρική ρύπανση; Εκτίμηση κινδύνου; Βενζόλιο; Ρύπανση εσωτερικών χώρων; Αθήνα; Occupational medicine; Aromatic hydrocarbons; Urban pollution; Biomarkers; Leukaemia; Indoor air quality; Vehicle emissinos; Air pollution; Risk assessment; Benzene; Indoor pollution; Biological markers; Athens

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Alexopoulos, E. (2002). Εκτίμηση επαγγελματικής και περιβαλλοντικής έκθεσης σε αρωματικούς υδρογονάνθρακες. Βενζόλιο και δείκτες βιολογικής έκθεσης. (Thesis). National and Kapodistrian University of Athens; Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών (ΕΚΠΑ). Retrieved from http://hdl.handle.net/10442/hedi/13760

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Alexopoulos, Evangelos. “Εκτίμηση επαγγελματικής και περιβαλλοντικής έκθεσης σε αρωματικούς υδρογονάνθρακες. Βενζόλιο και δείκτες βιολογικής έκθεσης.” 2002. Thesis, National and Kapodistrian University of Athens; Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών (ΕΚΠΑ). Accessed March 07, 2021. http://hdl.handle.net/10442/hedi/13760.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Alexopoulos, Evangelos. “Εκτίμηση επαγγελματικής και περιβαλλοντικής έκθεσης σε αρωματικούς υδρογονάνθρακες. Βενζόλιο και δείκτες βιολογικής έκθεσης.” 2002. Web. 07 Mar 2021.

Vancouver:

Alexopoulos E. Εκτίμηση επαγγελματικής και περιβαλλοντικής έκθεσης σε αρωματικούς υδρογονάνθρακες. Βενζόλιο και δείκτες βιολογικής έκθεσης. [Internet] [Thesis]. National and Kapodistrian University of Athens; Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών (ΕΚΠΑ); 2002. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/10442/hedi/13760.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Alexopoulos E. Εκτίμηση επαγγελματικής και περιβαλλοντικής έκθεσης σε αρωματικούς υδρογονάνθρακες. Βενζόλιο και δείκτες βιολογικής έκθεσης. [Thesis]. National and Kapodistrian University of Athens; Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών (ΕΚΠΑ); 2002. Available from: http://hdl.handle.net/10442/hedi/13760

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.