Search Results

An experimental investigation was conducted to determine the efficiency of 1,3-dioxolane as an alternative oxygenate to MTBE in Reformulated Gasoline. In the investigation, the effect of adding 1,3 dioxolane on octane rating was evaluated. The octane number of the fuels was determined using a Waukesha single cylinder, 4-stroke cycle, 2-valve, CFR F-2U octane rating unit. Certified 87 octane gasoline was used as the base fuel which 1,3-dioxolane was added at specific volumetric proportions. Iso-octane (100 octane number) and N-heptane (0 octane number) are primary reference fuels that were blended at volumetric proportions to produce a reference base of known octane number. The reference base fuel of known octane number was used for comparison of knock tendency to the test fuels under the ASTM D 2699 (Research) and ASTM D 2700 (Motor) methods of testing.

This experimental study involves optimization of the scheduling of diesel post injections to reduce soot emissions from a light-duty diesel engine. Previous work has shown that certain post injection schedules can reduce engine-out soot emissions when compared to conventional injection schedules for the same engine load. The purpose of this study is to investigate the impact of post injection scheduling for a range of engine conditions on a light duty multicylinder turbodiesel engine (1.9L GM ZDTH). For each engine operating condition, a test grid was developed so that only two variables (post injection duration and the commanded dwell time between main injection and post injection) were varied, with all other conditions held constant, in order to isolate the effects of the post injection schedule. Results have identified two distinct regimes of post injection schedules that reduce soot emissions.