Increase of high load limit in a gasoline HCCI engine

• Autorzy: Hunicz J. , Kordos P. , Gęca M.
• Języki publikacji: EN

Abstrakty

EN

Engine operation in HCCI mode allows for improvement of thermal efficiency and substantial reduction NOX emission. The most production feasible solution for gasoline HCCI engine is application of exhaust gas trapping using a negative valve overlap. This technique increases thermal energy of a mixture, thus allowing for auto-ignition at moderate compression ratios. However, high exhaust gas re-circulation rate decreases volumetric efficiency. As a result, achievable engine loads are also reduced. Supercharging can be applied in order to improve volumetric efficiency and extend high load limit. However, increase of amount of intake air can lead to reduction of start of compression temperature via decrease of residuals in a mixture. In order achieve HCCI mode of combustion, temperature of start of compression must be kept within narrow limits. In this study experimental and modeling investigations were presented. Experiments were carried out using single cylinder research engine. The engine was equipped with fully variable valvetrain and direct gasoline injection. Application of mechanical boosting allowed for widening achievable load range in HCCI mode of operation. Numerical calculations allowed for determination of admissible valvetrain settings and intake pressure, which guarantee proper temperature of start of compression.

Słowa kluczowe

EN

HCCI engine; negative valve overlap; high load limit; mechanical boost

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2012
• Tom: Vol. 19, No. 4
• Strony: 231--238
• Opis fizyczny: Bibliogr. 8 poz., rys.

Twórcy

autor

Hunicz J.

autor

Kordos P.

autor

Gęca M.

• Lublin University of Technology Institute of Transport, Combustion Engines and Ecology Nadbystrzycka 36, 20-618 Lublin, Poland tel.: [phone], fax: [phone],

Bibliografia

• [1] Gaynor, J. A., Fleck, R., Kee, R. J., Kenny, R. G., Cathcart, G., A study of efficiency and emissions for a 4-Stroke SI and a CAI engine with EEGR and light boost, SAE Technical Paper 2006-32-0042, 2006.
• [2] Hunicz, J., Kordos, P., An experimental study of fuel injection strategies in CAI gasoline engine, Experimental Thermal and Fluid Science, Vol. 35, pp. 243-252, 2011.
• [3] Najt, P., Foster, D. E., Compression-Ignited Homogeneous Charge Combustion, SAE Technical Paper 830264, 1983.
• [4] Scaringe, R. J., Wildman, C., Cheng, W. K., On the high load limit of boosted gasoline HCCI engine operating in NVO mode, SAE Technical Paper 2010-01-0162, 2010.
• [5] Stanglmaier, R. H., Roberts, Ch. E., Homogeneous charge compression ignition (HCCI): benefits, compromises, and future engine applications, SAE Technical Paper 1999-01-3682, 1999.
• [6] Wildman, C., Scaringe, R. J., Cheng, W. K., On the maximum pressure rise rate in boosted HCCI operation, SAE Technical Paper 2009-01-2727, 2009.
• [7] Yao, M., Zheng, Z., Liu, H., Progress and recent trends in homogeneous charge compression ignition (HCCI) engines, Progress in Energy and Combustion Science, Vol. 35, pp. 398–437, 2009.
• [8] Yap, D., Wyszyński, M. L., Megaritis, A., Xu, H., Applying boosting to gasoline HCCI operation with residual gas trapping, SAE Technical Paper 2005-01-2121, 2005.