000			02167nab a2200205 4500
005			20260520000840.0
008			260224s2009 xxu
245	0	0	_aBiodiesel emissions from a baseline engine operated with different injection systems and exhaust gas recircualtion (EGR) strategies during transient sequences
260			_a _b _cnov./dic. 2009
270			_a09/06/2010 ; 09/06/2010
300			_a13 p. ; 6168-6180
520			_aTranscripción del resumen del autor. This work is focused on the measurement and analysis of biodiesel emissions resulting from two commercial diesel engines derived from the same baseline engine. One of the engines was equipped with a rotary fuel injection pump electronically controlled. Another engine was equipped with a common-rail injection system. Both engines were tuned by the manufacturer with diesel fuel, and each of them was optimized with different exhaust gas recirculation (EGR) strategies. Both engines were tested under several transient conditions. A methyl ester obtained from unused sunflower oil was tested as diesel fuel, pure and blended with 30 and 70% of a commercial diesel fuel, which was also used pure. The engines were mounted in a test bench prepared for operating under transient conditions. An AVL 439 smoke meter and an Environnement gas analyzer allowed for the study of the effect of these fuels on the variations of the engine emissions with time. The consideration of the thermochemical properties of the tested fuels and the engine parameters, such as fuel/air ratio or EGR ratio, were used for the analysis of the results. The studied engine transient processes were (a) a load increase at constant engine speed and (b) an engine speed decrease at constant torque. The obtained results proved that the biodiesel effect on pollutant emissions during transient conditions depends upon the fuel injection system and EGR strategy used during the engine tuning.
581			_a6
773	0		_tEnergy & fuels _g23
942			_cARTICULO
100	1		_aArmas, Octavio _942452
100	1		_aGómez Arantzazu _942453
100	1		_aCárdenas, María D. _942454
999			_c170868 _d170868