Requirements of External EGR Systems for Dual Cam Phaser Turbo GDI Engines

Roth, David B.; Keller, Philip; Becker, Michael

doi:10.4271/2010-01-0588

Cited by 26 publications

(21 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A. 29 A large part of this can be attributed to the removal of NO, which can promote autoignition in the end gas and increase the propensity to knock.…”

Section: Resultsmentioning

confidence: 99%

“…The recorded impact of catalysed EGR on BSFC in the literature has ranged from a reduction of 2% 30 to an increase of 3.5%. 29 In order to further understand the mechanisms behind these figures, further investigation would be required. Some questions that should be addressed include the following:…”

Section: Resultsmentioning

confidence: 99%

“…It must also be noted that during their investigation, Roth et al 29 measured the external EGR rate by calculating the ratio of CO 2 measured in the intake to that in the exhaust manifold (equation (1)). This inherently carries an error when calculating the EGR rates with catalysed exhaust gases since the CO 2 content is increased when the gases pass through the catalyst by conversion of the CO molecules.…”

Section: Studies Focussing On Catalysed Egrmentioning

confidence: 99%

See 2 more Smart Citations

The potential of catalysed exhaust gas recirculation to improve high-load operation in spark ignition engines

Parsons

Akehurst

Brace

2014

International Journal of Engine Research

View full text Add to dashboard Cite

Within the literature, there are a number of studies investigating the benefits of exhaust gas recirculation, and as a result it has become established as a promising technology for combustion control to allow engine downsizing technology to be advanced. Aside from the dilution effect of exhaust gas recirculation, some of the components, such as NO, CO, and hydrocarbons, can have significant chemical effects. The literature shows that the component within exhaust gas recirculation which has the largest chemical effect on combustion is NO, which can promote or inhibit the onset of autoignition causing reactions within the end gas at high load. The reduction in NOx gases in catalysed exhaust gas recirculation can increase the knock limit at high load, with some authors reporting up to a 5 8 $ crank angle improvement in combustion phasing. There is conflicting evidence on whether this translates to an improvement in fuel consumption, with one study finding a decrease of up to 2% comparing to another finding an increase of 1.5%-3.5%. Crude calculations on the emissions of a 2.0-L direct injection spark ignition engine operating at high load show that in an extreme case the reduction in the calorific value of the inlet charge due to catalysis of the recirculated gases can be up to 4.5%. Despite the potential benefits, the literature on catalysed exhaust gas recirculation is fairly limited and the evidence seems so far inconclusive as to whether this technology may have the potential to further enhance the benefits of exhaust gas recirculation. This article uses current literature to ascertain the potential benefits of catalysed exhaust gas recirculation, compare to pre-catalyst exhaust gas recirculation, and investigates its individual components in more detail to explain how chemical interactions can either promote or inhibit ignition depending on their concentration and temperature.

show abstract

“…A. 29 A large part of this can be attributed to the removal of NO, which can promote autoignition in the end gas and increase the propensity to knock.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Studies Focussing On Catalysed Egrmentioning

confidence: 99%

See 1 more Smart Citation

The potential of catalysed exhaust gas recirculation to improve high-load operation in spark ignition engines

Parsons

Akehurst

Brace

2014

International Journal of Engine Research

View full text Add to dashboard Cite

show abstract

“…As part of this, pre-and post-catalyst EGR take-offs have been investigated, because there are conflicting views in the literature as to which is the more beneficial [14,15]. From the work to date, it is thought that such conflicting evidence may be confused by the use of high-or low-pressure EGR loops, which are in themselves known to affect turbocharged engine performance in different ways, regardless of whether the EGR is catalyzed or not [2,16].…”

Section: Nmmentioning

confidence: 99%

Ultra boost for economy: realizing a 60% downsized engine concept

Turner

Popplewell

Richardson

et al. 2013

Internal Combustion Engines: Performance, Fuel Economy and Emissions

View full text Add to dashboard Cite

“…A custom-made LP-EGR system was added since original engine did not include the EGR path. The exhaust gas was extracted downstream of the TWC and recirculated to the compressor inlet, allowing homogenous mixture (fresh air + EGR) at the intake manifold [39]. The LP-EGR line design was done incorporating a water-gas cooler which allowed control in EGR gas temperature, followed by a control valve which controlled EGR rate.…”

Section: Test Bench Facilities and Fuel Usedmentioning

confidence: 99%

Analysis of Regulated Pollutant Emissions and Aftertreatment Efficiency in a GTDi Engine Using Different SOI Strategies

Bermúdez

Luján

Climent

et al. 2018

SAE Int. J. Engines

View full text Add to dashboard Cite

In order to improve performance and minimize pollutant emissions in gasoline turbocharged directinjection (GTDi) engines, different injection strategies and technologies are being investigated. The inclusion of exhaust gas recirculation (EGR) and the variation of the start of injection (SOI) are some of these strategies that can influence the air-to-fuel (AF) mixture formation and consequently in the combustion process and pollutant emissions. This paper presents a complete study of the engine performance, pollutant emissions and aftertreatment efficiency that produces the SOI variation with a fixed EGR rate in a 4-cylinder, turbocharged, gasoline direct-injection engine with 2.0 L displacement. The equipment used in this study are TSI-EEPS for particle measurement and HORIBA MEXA 1230-PM for soot measurement being HORIBA MEXA 7100-DEGR with a heated line selector the system employed for regulated gaseous emission measurement and aftertreatment evaluation. The experimental results confirm how the use of an adequate SOI strategy is indispensable to obtain low exhaust emissions values and a balance between the different pollutants. There was found a slight reduction in brake specific fuel consumption (BSFC) with the SOI advance. The experiments showed a decrease in CO, a non-sensible variation of THC and an increase in NOx emissions with SOI delay. Additionally, a significant increase in particle emissions was observed with early SOIs. Finally, with the SOI delay the aftertreatment performance revealed an increase in the oxidation of CO and a decrease in the reduction of NOx.

show abstract

Requirements of External EGR Systems for Dual Cam Phaser Turbo GDI Engines

Cited by 26 publications

References 7 publications

The potential of catalysed exhaust gas recirculation to improve high-load operation in spark ignition engines

The potential of catalysed exhaust gas recirculation to improve high-load operation in spark ignition engines

Ultra boost for economy: realizing a 60% downsized engine concept

Analysis of Regulated Pollutant Emissions and Aftertreatment Efficiency in a GTDi Engine Using Different SOI Strategies

Contact Info

Product

Resources

About