CARE – CAtalytic Reformated Exhaust Gases in Turbocharged DISI-Engines

Hoffmeyer, Henrik; Montefrancesco, Emanuela; Beck, Linda Maria; Willand, Jürgen; Ziebart, Florian; Mauß, Fabian

doi:10.4271/2009-01-0503

Cited by 33 publications

(23 citation statements)

References 14 publications

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“…Its removal from EGR therefore reduces the ignition delay, but with less effect than both NO and C 2 H 2 . 30 The sensitivity study conducted by Hoffmeyer et al 30 (illustrated in Figure 2) found that other HCs that may be present in recirculated exhaust gases had little or no effect on ignition delay.…”

Section: Hcsmentioning

confidence: 98%

“…In consideration of the products involved, Hoffmeyer et al 30 conducted a sensitivity study to evaluate the contribution of each EGR component on ignition delay time. Their results are shown in Figure 2, where it can be seen that after catalysis the increase in ignition delay stems primarily from the reduction in NO and C 2 H 2 .…”

Section: Studies Focussing On Catalysed Egrmentioning

confidence: 99%

“…The CO 2 has no significant chemical effect on the kinetics of combustion, but it does provide the thermodynamic effect of increasing the heat capacity of the end gas, which slows the flame propagation during combustion. 30…”

Section: Nox Mechanismmentioning

confidence: 99%

“…As with any additive, the effect of the addition of HCs will depend on the RON of the HCs added in comparison to the RON of the fuel. In the sensitivity analysis of each EGR component on ignition delay time conducted by Hoffmeyer et al 30 (shown in Figure 2), they pick out C 2 H 2 and C 3 H 8 as the HCs, which have any significant effect on ignition timing. C 2 H 2 has a high knock tendency in comparison to saturated HCs 48 and reacts via equation (20) to form OH radicals…”

Section: Hcsmentioning

confidence: 99%

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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

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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.

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Section: Hcsmentioning

confidence: 98%

Section: Studies Focussing On Catalysed Egrmentioning

confidence: 99%

Section: Nox Mechanismmentioning

confidence: 99%

Section: Hcsmentioning

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

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%