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Visar resultat 1 - 5 av 36 avhandlingar som matchar ovanstående sökkriterier.

1. 1. Alternative Combustion Strategies for Gasoline Engines

   Författare :Daniel Dahl; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; engines; SI; SGDI; CAI; HCCI; Otto; lean burn; gasoline; combustion; fuel consumption;

   Sammanfattning : Due to increasingly strict legislative demands and customer concerns regarding CO2emissions, there is a need to develop and implement new combustion strategies forgasoline (Otto) engines. In attempts to meet this need, most attention is focusing onthe low load/speed range where the classic spark ignition strategy (SI) has poorefficiency, mainly due to the throttling of the intake air causing pumping losses. LÄS MER

3. 2. Experimental studies of NOx storage catalysts -Preparation, characterisation, NOx regeneration and sulfur deactivation

   Författare :Hussam Abdulhamid; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; sulfur poisoning; CO; DRIFT; precious metal; SO2; NOx storage; H2; NOx reduction; reducing agents; C3H6; H2O; C3H8; lean-burn;

   Sammanfattning : .... LÄS MER

4. 3. Aging effects on commercial lean NOx trap catalysts

   Författare :Jesus De Abreu Goes; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; aging; thermal degradation; sulfur poisoning; characterization; commercial lean NOx traps; NOx storage and reduction;

   Sammanfattning : As a countermeasure to global warming, vehicles with low carbon emissions are being investigated by promoting lean-burn engines and high combustion efficiencies. However, one limitation to the increasing use of these engines is the need to develop corresponding catalytic systems for controlling the nitrogen oxide (NOx) emissions in their lean exhaust. LÄS MER

5. 4. Experimental Studies of Advanced Ignition Systems for Lean Burn Natural Gas Engines

   Författare :Jessica Dahlström; Förbränningsmotorer; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; ignition system; spark energy; internal combustion engine; engine; spark ignition; natural gas;

   Sammanfattning : One of the greatest challenges for the transport sector today is reducing its environmental impact. This applies especially to the emission aspects, much due to increasingly stringent emissions legislations. LÄS MER

7. 5. Exergy Evaluation of Engine Operations : Combustion Process to Exhaust Flow

   Författare :Beichuan Hong; Andreas Cronhjort; Mihai Mihaescu; Sundar Rajan Krishnan; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Thermal efficiency; Exergy analysis; Marine engine; Lean-burn combustion; Pulsating flow measurement; Pitot tube; Sensitivity analysis; Energy and exergy losses; Termisk verkningsgrad; Exergianalys; Marinmotor; Magertbränningsförbränning; Pulserande flödesmätning; Pitotrör; Känslighetsanalys; Energiförluster och exergiförluster; Machine Design; Maskinkonstruktion; Energiteknik; Energy Technology;

   Sammanfattning : Transitioning the transport sector to clean energy sources is crucial for mitigating greenhouse gas emissions and achieving carbon neutrality. A collaborative solution, combining both electric vehicles and combustion engines using renewable fuels, may prove more effective than competitive ones. LÄS MER