Experimental Investigation of Internal Exhaust Gas Recirculation on a Variable Valve Actuation Spark Ignition Engine Operating with Gasoline and Ethanol

2016 ◽  
Author(s):  
Heder Fernandes ◽  
Charles Quirino Pimenta ◽  
Wanderson Navegantes Rodrigues ◽  
Raphael Bezerra de Souza Montemor ◽  
José Eduardo Mautone Barros
Keyword(s):  
Experimental Investigation ◽  
Exhaust Gas Recirculation ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Exhaust Gas ◽  
Variable Valve Actuation ◽  
Variable Valve ◽  
Gas Recirculation ◽  
Valve Actuation

scholarly journals Variable valve actuation–based combustion control strategies for efficiency improvement and emissions control in a heavy-duty diesel engine

2019 ◽  
Vol 21 (4) ◽  
pp. 578-591 ◽  
Author(s):  
Wei Guan ◽  
Vinícius B Pedrozo ◽  
Hua Zhao ◽  
Zhibo Ban ◽  
Tiejian Lin
Keyword(s):  
Control Strategies ◽  
Exhaust Gas Recirculation ◽  
Exhaust Gas ◽  
Effective Pressure ◽  
Miller Cycle ◽  
Variable Valve Actuation ◽  
Indicated Mean Effective Pressure ◽  
Variable Valve ◽  
Gas Recirculation ◽  
Valve Actuation

High nitrogen oxide levels of the conventional diesel engine combustion often requires the introduction of exhaust gas recirculation at high engine loads. This can adversely affect the smoke emissions and fuel conversion efficiency associated with a reduction of the in-cylinder air-fuel ratio (lambda). In addition, low exhaust gas temperatures at low engine loads reduce the effectiveness of aftertreatment systems necessary to meet stringent emissions regulations. These are some of the main issues encountered by current heady-duty diesel engines. In this work, variable valve actuation–based advanced combustion control strategies have been researched as means of improving upon the engine exhaust temperature, emissions, and efficiency. Experimental analysis was carried out on a single-cylinder heady-duty diesel engine equipped with a high-pressure common-rail fuel injection system, a high-pressure loop cooled exhaust gas recirculation, and a variable valve actuation system. The variable valve actuation system enables a late intake valve closing and a second intake valve opening during the exhaust stroke. The results showed that Miller cycle was an effective technology for exhaust temperature management of low engine load operations, increasing the exhaust gas temperature by 40 °C and 75 °C when running engine at 2.2 and 6 bar net indicated mean effective pressure, respectively. However, Miller cycle adversely effected carbon monoxide and unburned hydrocarbon emissions at a light load of 2.2 bar indicated mean effective pressure. This could be overcome when combining Miller cycle with a second intake valve opening strategy due to the formation of a relatively hotter in-cylinder charge induced by the presence of internal exhaust gas recirculation. This strategy also led to a significant reduction in soot emissions by 82% when compared with the baseline engine operation. Alternatively, the use of external exhaust gas recirculation and post injection on a Miller cycle operation decreased high nitrogen oxide emissions by 67% at a part load of 6 bar indicated mean effective pressure. This contributed to a reduction of 2.2% in the total fluid consumption, which takes into account the urea consumption in aftertreatment system. At a high engine load of 17 bar indicated mean effective pressure, a highly boosted Miller cycle strategy with exhaust gas recirculation increased the fuel conversion efficiency by 1.5% while reducing the total fluid consumption by 5.4%. The overall results demonstrated that advanced variable valve actuation–based combustion control strategies can control the exhaust gas temperature and engine-out emissions at low engine loads as well as improve upon the fuel conversion efficiency and total fluid consumption at high engine loads, potentially reducing the engine operational costs.

scholarly journals Experimental study on knock sources in spark ignition engine with exhaust gas recirculation

2018 ◽  
Vol 165 ◽  
pp. 35-44 ◽  
Author(s):  
Mladen Božić ◽  
Ante Vučetić ◽  
Momir Sjerić ◽  
Darko Kozarac ◽  
Zoran Lulić
Keyword(s):  
Experimental Study ◽  
Exhaust Gas Recirculation ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Exhaust Gas ◽  
Gas Recirculation

scholarly journals Issues related to adjustment of a spark ignition engine with exhaust gas recirculation

2004 ◽  
Vol 119 (2) ◽  
pp. 12-22
Author(s):  
Dariusz PIETRAS ◽  
Maciej SOBIESZCZAŃSKI
Keyword(s):  
Engine Performance ◽  
Exhaust Gas Recirculation ◽  
Spark Ignition ◽  
Negative Influence ◽  
Spark Ignition Engine ◽  
Control Algorithms ◽  
Exhaust Gas ◽  
Exhaust Gases ◽  
Vehicle Engine ◽  
Gas Recirculation

The article presents results of a spark ignition engine examination, which has been conducted to establish the influence of exhaust gases recirculation on the engine performance and the toxic content in exhaust gases. The research concentrated on identifying a range of recirculation levels, which enabled to eliminate its negative influence on the engine performance by means of selecting an appropriate angle of advance. Further, the article discusses the engine examination procedures involving different recirculation control algorithms in the ECM chip. Finally, the article presents EURO II and EURO III tests, conducted on a vehicle/engine controlled by the above-mentioned software.

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