Highly Turbocharging a Flow Restricted Two Cylinder Small Engine - Turbocharger Development

Attard, William P.; Watson, Harry C.; Konidaris, Steven

doi:10.4271/2007-01-1562

Cited by 15 publications

(13 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To put the research into context, experimental engine results at the maximum specific output setting and associated CR of 10 are displayed in Figure 2, with further detail on the test engine previously published [7][8][9][10][11][12][13]. To reliably achieve 25 BMEP, the asymmetric (odd) fire configuration required the uneven flow conditions in the intake and exhaust systems to be accommodated in the engine design [12,13]. In addition to the turbocharged results displayed in Figure 2, the test engine achieved a maximum of 37% brake thermal efficiency in normally aspirated configuration [7,9].…”

Section: Experimental Enginementioning

confidence: 99%

“…The second effect is the actual occurrence of knocking cycles as the knock compensation strategies only succeed in suppressing the knock below the damage limit at the elevated MAP ( Figure 10). Nevertheless, the variation in combustion variability could be eliminated if knock could be controlled using other well documented proven techniques previously discussed [7,10,13].…”

Section: Combustion Analysismentioning

confidence: 99%

See 1 more Smart Citation

Combustion System Development and Analysis of a Downsized Highly Turbocharged PFI Small Engine

Attard¹,

Toulson²,

Hamori³

et al. 2010

SAE Int. J. Engines

Self Cite

View full text Add to dashboard Cite

This paper provides some insight into the future direction for developing smaller capacity downsized engines, which will be needed to meet tight CO 2 targets and the world's future powertrain requirements. This paper focuses on the combustion system development and combustion analysis results for a downsized 0.43 liter highly turbocharged engine. The inline two cylinder engine used in experiments was specifically designed and constructed to enable 25 bar BMEP. Producing this specific output is one way forward for future passenger vehicle powertrains, enabling in excess of 50% swept capacity reduction whilst maintaining comparable vehicle performance. Previous experiments and analysis have found that the extent to which larger engines can be downsized while still maintaining equal performance is combustion limited. Hence, small engine combustion is explored over a number of parametric studies, including a range of manifold absolute pressures up to 270 kPa, engine speeds exceeding 10,000 rev/min and compression ratios ranging from 9 to 13. Experimental results indicate that small engine combustion hurdles can be overcome to reliably extend the specific output to 25 bar BMEP. This is believed to be the highest recorded specific output for a non-intercooled small spark ignition PFI engine operating on pump gasoline. However, the boosted combustion effects illustrate that the thermal efficiency is highly dependent on the combustion efficiency, which deteriorates rapidly if uncontrolled combustion, specifically knock in the endgas region is encountered. However, with this combustion system design strategy, potential drive cycle fuel consumption improvements in excess of 20% are still achievable.

show abstract

Section: Experimental Enginementioning

confidence: 99%

Section: Combustion Analysismentioning

confidence: 99%

Combustion System Development and Analysis of a Downsized Highly Turbocharged PFI Small Engine

Attard¹,

Toulson²,

Hamori³

et al. 2010

SAE Int. J. Engines

Self Cite

View full text Add to dashboard Cite

show abstract

“…The original intent of this development program was to achieve success in Formula SAE competition using a specifically designed and developed downsized engine. However, from the research and development process, more significant findings concerning small engines have been discovered [8][9][10][11][12][13][14]. This paper focuses on the feasibility of replacing larger engines found in passenger vehicles with smaller downsized versions.…”

Section: Objectivesmentioning

confidence: 99%

“…Most of the engine components were specially cast or machined from billets. Further detail concerning the test engine is documented [8][9][10][11][12][13][14], with general specifications given in Table 1. Figure 1 displays the final TC version while Figure 2 highlights a sectional view of the engine design.…”

Section: Test Enginementioning

confidence: 99%

“…This is initially caused by inadequate turbocharger air supply, followed by choked flow through the intake restriction. Once the choked flow operating condition was reached and verified, the turbocharger wastegate valve was manipulated by the ECU in order to minimize losses [11]. The WOT condition for a given CR is denoted as the performance limit (PL), highlighted by the dashed line in Figures 5, 10 and 11.…”

Section: Klmentioning

confidence: 99%

See 1 more Smart Citation

The Feasibility of Downsizing a 1.25 Liter Normally Aspirated Engine to a 0.43 Liter Highly Turbocharged Engine

Attard¹,

Konidaris²,

Toulson³

et al. 2007

SAE Technical Paper Series

Self Cite

View full text Add to dashboard Cite

In this paper, performance, efficiency and emission experimental results are presented from a prototype 434 cm 3 , highly turbocharged (TC), two cylinder engine with brake power limited to approximately 60 kW. These results are compared to current small engines found in today's automobile marketplace. A normally aspirated (NA) 1.25 liter, four cylinder, modern production engine with similar brake power output is used for comparison. Results illustrate the potential for downsized engines to significantly reduce fuel consumption while still maintaining engine performance. This has advantages in reducing vehicle running costs together with meeting tighter carbon dioxide (CO 2) emission standards. Experimental results highlight the performance potential of smaller engines with intake boosting. This is demonstrated with the test engine achieving 25 bar brake mean effective pressure (BMEP). Results are presented across varying parameter domains, including engine speed, compression ratio (CR), manifold absolute pressure (MAP) and lambda (λ). Engine operating limits are also outlined, with spark knock highlighted as the major limitation in extending the operating limits for this downsized engine.

show abstract

Highly Turbocharging a Restricted, Odd Fire, Two Cylinder Small Engine - Design, Lubrication, Tuning and Control

Attard

Watson

Konidaris

2006

SAE Technical Paper Series

Self Cite

View full text Add to dashboard Cite

This paper describes the mechanical component design, lubrication, tuning and control aspects of a restricted, odd fire, highly turbocharged (TC) engine for Formula SAE competition. The engine was specifically designed and configured for the purpose, being a twin cylinder inline arrangement with double overhead camshafts and four valves per cylinder. Most of the engine components were specially cast or machined from billets.

show abstract

Highly Turbocharging a Flow Restricted Two Cylinder Small Engine - Turbocharger Development

Abstract: This paper describes the turbocharger development of a restricted 430 cm 3 odd firing two cylinder engine. The downsized test engine used for development was specifically designed and configured for Formula SAE, SAE's student Formula race-car competition.

Cited by 15 publications

References 14 publications

Combustion System Development and Analysis of a Downsized Highly Turbocharged PFI Small Engine

Combustion System Development and Analysis of a Downsized Highly Turbocharged PFI Small Engine

The Feasibility of Downsizing a 1.25 Liter Normally Aspirated Engine to a 0.43 Liter Highly Turbocharged Engine

Highly Turbocharging a Restricted, Odd Fire, Two Cylinder Small Engine - Design, Lubrication, Tuning and Control

Contact Info

Product

Resources

About