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Investigating and Comparison of Emission and Fuel Consumption Behavior of Diesel Vehicles under Various Elevations Using Portable

Ashjaee, Behzad | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50570 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Hosseini, Vahid
  7. Abstract:
  8. As elevation increase, environmental impacts will change, and this will affect on vehicle performance. The pressure drop and consequently the drop in air density at high altitude affect the volumetric efficiency of the engine. This exacerbates engine combustion, since the engine displacement volume is constant, with the drop in air density, the intake air mass flow rate decreases. In this situation, the engine does not have enough air to burn the fuel, and as a result the engine ignition will getting into the defect. ECU only changes the amount of injecting fuel and has no control on the entering air flow to the engine. In such circumstances, emissions from the vehicle are expected to increase as well. In this study, using portable measurement method, changes in the engine performance parameters, emission factors and fuel consumption of a turbocharged diesel van was measured by increasing the altitude from the sea level. The altitude ranged from zero to 2700 meters. The tests were carried out in idle and constant speed condition. The results showed that by increasing the altitude from the sea level, the emission factor for HC and NOx will increase. The CO emission factor depending on the operating conditions and the engine load may have different behavior. The emission factor of PM also decreases in idle operation with elevation above sea level, but for the steady-state condition, the amount of this pollutant increases with elevation, so that the emission factor of PM for 1000m elevation is about 100 percent greater than sea level. In general, it was also found that at engine high load condition, the turbocharger was more effective in compensating of the pressure drop in inlet air and bringing the values back to sea-level elevation and could have more efficient performance
  9. Keywords:
  10. Fuel Consumption ; Pollution ; Portable Emission Test ; Fuel Consumption ; Height Encrease ; Diesel Vehicle

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