The Effect of Cooled EGR on Emissions and Performance of a Turbocharged HCCI Engine
(2003) SAE 2003 World Congress and Exhibition 2003(1742). p.21-38- Abstract
- This paper discusses the effects of cooled EGR on a turbocharged multi-cylinder HCCI engine. A six-cylinder, 12-liter, Scania D12 truck engine is modified for HCCI operation. It is fitted with port fuel injection of ethanol and n-heptane and cylinder pressure sensors for closed-loop combustion control. The effects of EGR are studied in different operating regimes of the engine. During idle, low speed and no load, the focus is on the effects on combustion efficiency, emissions of unburned hydrocarbons and CO. At intermediate load, run without turbocharging to achieve a well-defined experiment, combustion efficiency and emissions from incomplete combustion are still of interest. However the effect on NOdx and the thermodynamic effect on... (More)
- This paper discusses the effects of cooled EGR on a turbocharged multi-cylinder HCCI engine. A six-cylinder, 12-liter, Scania D12 truck engine is modified for HCCI operation. It is fitted with port fuel injection of ethanol and n-heptane and cylinder pressure sensors for closed-loop combustion control. The effects of EGR are studied in different operating regimes of the engine. During idle, low speed and no load, the focus is on the effects on combustion efficiency, emissions of unburned hydrocarbons and CO. At intermediate load, run without turbocharging to achieve a well-defined experiment, combustion efficiency and emissions from incomplete combustion are still of interest. However the effect on NOdx and the thermodynamic effect on thermal efficiency, from a different gas composition, are studied as well. At high load and boost pressure the main focus is NOdx emissions and the ability to run high mean effective pressure without exceeding the physical constraints of the engine. In this case the effects of EGR on boost and combustion duration and phasing are of primary interest. It is shown that CO, HC and NOdx emissions in most cases all improve with EGR compared to lean burn. Combustion efficiency, which is computed based on exhaust gas analysis, increases with EGR due to lower emissions of CO and HC. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/538212
- author
- Olsson, Jan-Ola LU ; Tunestål, Per LU ; Ulfvik, Jonas LU and Johansson, Bengt LU
- organization
- publishing date
- 2003
- type
- Chapter in Book/Report/Conference proceeding
- publication status
- published
- subject
- keywords
- EGR, Combustion, HCCI, Engine
- host publication
- SAE Special Publications
- volume
- 2003
- issue
- 1742
- article number
- 2003-01-0743
- pages
- 21 - 38
- publisher
- Society of Automotive Engineers
- conference name
- SAE 2003 World Congress and Exhibition
- conference location
- Detroit, Michigan, United States
- conference dates
- 2003-03-03 - 2003-03-06
- external identifiers
-
- scopus:85072428279
- DOI
- 10.4271/2003-01-0743
- project
- Competence Centre for Combustion Processes
- language
- English
- LU publication?
- yes
- id
- 26bcbeca-67eb-4074-9027-202f642f096e (old id 538212)
- date added to LUP
- 2016-04-04 10:38:30
- date last changed
- 2022-02-28 18:42:19
@inproceedings{26bcbeca-67eb-4074-9027-202f642f096e, abstract = {{This paper discusses the effects of cooled EGR on a turbocharged multi-cylinder HCCI engine. A six-cylinder, 12-liter, Scania D12 truck engine is modified for HCCI operation. It is fitted with port fuel injection of ethanol and n-heptane and cylinder pressure sensors for closed-loop combustion control. The effects of EGR are studied in different operating regimes of the engine. During idle, low speed and no load, the focus is on the effects on combustion efficiency, emissions of unburned hydrocarbons and CO. At intermediate load, run without turbocharging to achieve a well-defined experiment, combustion efficiency and emissions from incomplete combustion are still of interest. However the effect on NOdx and the thermodynamic effect on thermal efficiency, from a different gas composition, are studied as well. At high load and boost pressure the main focus is NOdx emissions and the ability to run high mean effective pressure without exceeding the physical constraints of the engine. In this case the effects of EGR on boost and combustion duration and phasing are of primary interest. It is shown that CO, HC and NOdx emissions in most cases all improve with EGR compared to lean burn. Combustion efficiency, which is computed based on exhaust gas analysis, increases with EGR due to lower emissions of CO and HC.}}, author = {{Olsson, Jan-Ola and Tunestål, Per and Ulfvik, Jonas and Johansson, Bengt}}, booktitle = {{SAE Special Publications}}, keywords = {{EGR; Combustion; HCCI; Engine}}, language = {{eng}}, number = {{1742}}, pages = {{21--38}}, publisher = {{Society of Automotive Engineers}}, title = {{The Effect of Cooled EGR on Emissions and Performance of a Turbocharged HCCI Engine}}, url = {{https://lup.lub.lu.se/search/files/5586753/625778.pdf}}, doi = {{10.4271/2003-01-0743}}, volume = {{2003}}, year = {{2003}}, }