Actas de congresos
Ignition Timing As A Strategy To Reduce Spark-ignition Engine Emissions In The Cold Phase
Registro en:
Sae Technical Papers. , v. 13, n. , p. - , 2013.
10.4271/2013-36-0314
2-s2.0-84891614732
Autor
Guerra R.F.
Gallo W.L.R.
Institución
Resumen
The controlled emissions limits defined to passenger cars are becoming very stringent. Therefore, the first minutes of the emissions test cycles gained importance. This work deals with a strategy to reduce the emissions of NMHC, CO and NOx in the cold phase of the test cycle, while the engine and catalyst are cold. Leaving the engine, the exhaust gases pass through a three-way catalyst to reduce controlled pollutant gases, but the catalyst is effective only above 300°C (the so-called light-off temperature). When the catalyst is not hot enough, the gases pass through the catalyst without any beneficial effect. In modern engines, most of the NMHC emissions occur in the cold phase; then, reducing this pollutant in the cold phase is the main objective of the adopted strategy. Besides, significant amounts of CO and NOx are formed during this phase and this must also be considered. The strategy adopted in this work is to retard the ignition timing, so the exhaust gases leave the engine hotter, reducing the time to increase the catalyst temperature and, as a consequence, reducing the time to attain the light-off temperature. This strategy was implemented in a passenger car engine, which was tested according to Brazilian Code ABNT NBR 6601. The obtained results proved this strategy is viable and can reduce the cold phase emissions. © 2013 SAE INTERNATIONAL. 13
Nigro, F.E.B., Gallo, W.L.R., Ethanol use as fuel. Tutorial Course (2011) First Brazilian Bioenergy Science and Technology Conference (BBEST). Campos Do Jordão, SP Catalisadores Automotivos (2003) Apresentação, , Umicore do Brasil Ltda. "" Catalisadores Automotivos (2003) Apresentação. Curitiba, , Johnson Matthey South America. "" Silva Filho, A.V., O ensaio de emissão veicular (2006) Fórum de Discussão Dos Resultados Do Ensaio de Proficiência em Emissões Veiculares, 2a Rodada Blumrich, S., Emissões no Ciclo FTP-75 (2009) Apresentação. Seminário SAE Powertrain Heywood, J.B., (1988) Internal Combustion Engine Fundamentals, , McGraw-Hill Inc Chan, S.H., A practical approach for rapid catalyst light-off by means of strategic engine control (2001) Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, 215, p. 545 Choi, M.S., Sun, H.Y., Lee, C.H., Myung, Kim, W.T., Choi, J.K., The Study of HC Emission Characteristics and Combustion Stability with Spark Timing Retard at Cold Start in Gasoline Engine Vehicle (2000) SAE Technical Paper Series 2000-01-1082, , Hyundai Motor Co Choi, K., Lee, H., Hwang, I.G., Myung, C.L., Park, S., Effects of various intake valve timings and spark timings on combustion, cyclic THC and NOx emissions during cold start phase with idle operation in CVVT engine (2008) Journal of Mechanical Science and Technology, 22, p. 2254. , 2262. 2008 Hirose, S., Yamamoto, Y., Miyairi, Y., Makino, M., Nakasuji, Y., Miwa, S., Application of Converter Efficiency Simulation Tool for Substrate Design (2004) SAE Technical Paper Series, 2004-01-1487 Burgio, G., Controllo Motore Base (2000) Apresentação. Magneti Marelli Powertrain Systems Presentation. Italia Patterson, D.J., Henein, N.A., Emissions from Combustion Engines and Their Control (1972) Ann Arbor Science Raggi, M.V., Modelagem da Cinética Química de Formação de NOx e CO em motores com ignição por centelha (2005) Dissertação de Mestrado, , Pontifícia Universidade Católica de Minas Gerais (PUC Minas). Belo Horizonte