Author: Kelly Scott Baker
Publisher:
ISBN:
Category :
Languages : en
Pages : 188
Book Description
Effect of Fuel Volatility on Fuel Vaporization, Combustion Quality, and Hydrocarbon Emissions During Starting and Warm-up in Spark-ignition Engines
Author: Kelly Scott Baker
Publisher:
ISBN:
Category :
Languages : en
Pages : 188
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 188
Book Description
Fuel Effects on Driveability and Hydrocarbon Emissions of Spark-ignition Engines During Starting and Warm-up Processes
Author: Kuo-Chiang Chen
Publisher:
ISBN:
Category :
Languages : en
Pages : 250
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 250
Book Description
Liquid Fuel Transport Into the Cylinder in Spark Ignition Engines
Author: Robert Meyer
Publisher:
ISBN:
Category :
Languages : en
Pages : 165
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 165
Book Description
Army R, D & A.
Author:
Publisher:
ISBN:
Category : Military research
Languages : en
Pages : 238
Book Description
Publisher:
ISBN:
Category : Military research
Languages : en
Pages : 238
Book Description
Control Strategy for Hydrocarbon Emissions in Turbocharged Direct Injection Spark Ignition Engines During Cold-start
Author: Kevin David Cedrone
Publisher:
ISBN:
Category :
Languages : en
Pages : 191
Book Description
Gasoline consumption and pollutant emissions from transportation are costly and have serious, demonstrated environmental and health impacts. Downsized, turbocharged direct-injection spark ignition (DISI) gasoline engines consume less fuel and achieve superior performance compared with conventional port fuel injected spark ignition (PFI-SI) engines. Although more efficient, turbocharged DISI engines have new emissions challenges during cold start. DISI fuel injection delivers more liquid fuel into the combustion chamber, increasing the emissions of unburned hydrocarbons. The turbocharger slows down activation (warm-up) of the catalytic exhaust after-treatment system. The objective of this research is to find a control strategy that: 1. Accelerates warm-up of the catalyst, and 2. Maintains low emissions of unburned hydrocarbons (UBHCs) during the catalyst warm-up process. This research includes a broad experimental survey of engine behaviour and emission response for a modern turbocharged DISI engine. The study focuses on the idle period during cold-start for which DISI engine emissions are worst. Engine experiments and simulations show that late and slow combustion lead to high exhaust gas temperatures and mass flow rate for fast warm-up. However, late and slow combustion increase the risk of partial-burn misfire. At the misfire limit for each parameter, the following conclusions are drawn: 1. Late ignition timing is the most effective way to increase exhaust enthalpy flow rate for fast catalyst warm-up. 2. By creating a favourable spatial fuel-air mixture stratification, split fuel injection can simultaneously retard and stabilize combustion to improve emissions and prevent partial-burn misfire. 3. Excessive trapped residuals from long valve overlap limit the potential for valve timing to reduce cold-start emissions. 4. Despite their more challenging evaporation characteristics, fuel blends with high ethanol content showed reasonable emissions behaviour and greater tolerance to late combustion than neat gasoline. 5. Higher exhaust back-pressure leads to high exhaust temperature during the exhaust stroke, leading to significantly more post-flame oxidation. 6. Post-flame oxidation in the combustion chamber and exhaust system play a critical role in decreasing the quantity of catalyst-in emissions due to hydrocarbons that escape primary (flame) combustion. A cold start strategy combining late ignition, 15% excess air, and high exhaust backpressure yielded the lowest cumulative hydrocarbon emissions during cold start.
Publisher:
ISBN:
Category :
Languages : en
Pages : 191
Book Description
Gasoline consumption and pollutant emissions from transportation are costly and have serious, demonstrated environmental and health impacts. Downsized, turbocharged direct-injection spark ignition (DISI) gasoline engines consume less fuel and achieve superior performance compared with conventional port fuel injected spark ignition (PFI-SI) engines. Although more efficient, turbocharged DISI engines have new emissions challenges during cold start. DISI fuel injection delivers more liquid fuel into the combustion chamber, increasing the emissions of unburned hydrocarbons. The turbocharger slows down activation (warm-up) of the catalytic exhaust after-treatment system. The objective of this research is to find a control strategy that: 1. Accelerates warm-up of the catalyst, and 2. Maintains low emissions of unburned hydrocarbons (UBHCs) during the catalyst warm-up process. This research includes a broad experimental survey of engine behaviour and emission response for a modern turbocharged DISI engine. The study focuses on the idle period during cold-start for which DISI engine emissions are worst. Engine experiments and simulations show that late and slow combustion lead to high exhaust gas temperatures and mass flow rate for fast warm-up. However, late and slow combustion increase the risk of partial-burn misfire. At the misfire limit for each parameter, the following conclusions are drawn: 1. Late ignition timing is the most effective way to increase exhaust enthalpy flow rate for fast catalyst warm-up. 2. By creating a favourable spatial fuel-air mixture stratification, split fuel injection can simultaneously retard and stabilize combustion to improve emissions and prevent partial-burn misfire. 3. Excessive trapped residuals from long valve overlap limit the potential for valve timing to reduce cold-start emissions. 4. Despite their more challenging evaporation characteristics, fuel blends with high ethanol content showed reasonable emissions behaviour and greater tolerance to late combustion than neat gasoline. 5. Higher exhaust back-pressure leads to high exhaust temperature during the exhaust stroke, leading to significantly more post-flame oxidation. 6. Post-flame oxidation in the combustion chamber and exhaust system play a critical role in decreasing the quantity of catalyst-in emissions due to hydrocarbons that escape primary (flame) combustion. A cold start strategy combining late ignition, 15% excess air, and high exhaust backpressure yielded the lowest cumulative hydrocarbon emissions during cold start.
Army RD & A.
Author:
Publisher:
ISBN:
Category : Military research
Languages : en
Pages : 664
Book Description
Publisher:
ISBN:
Category : Military research
Languages : en
Pages : 664
Book Description
Army R, D & A.
Author:
Publisher:
ISBN:
Category : Military research
Languages : en
Pages : 884
Book Description
Publisher:
ISBN:
Category : Military research
Languages : en
Pages : 884
Book Description
Army RD & A Bulletin
Author:
Publisher:
ISBN:
Category : Military research
Languages : en
Pages : 234
Book Description
Publisher:
ISBN:
Category : Military research
Languages : en
Pages : 234
Book Description
Scientific and Technical Aerospace Reports
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 558
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 558
Book Description
Ignition Quality and Composition of Fuel Volatile Fraction
Author: Robert E. Bair
Publisher:
ISBN:
Category :
Languages : en
Pages : 380
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 380
Book Description