Effect of Fuel Properties on First Cycle Fuel Delivery in a SI Engine Sloan Automotive Laboratory Massachusetts Institute of Technology

Format:

Conference/Event

Author/Creator:

Lang, Kevin R., author.

Conference Name:

2004 Powertrain & Fluid Systems Conference & Exhibition (2004-10-25 : Tampa, Florida, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2004

Summary:

The fuel property effects on first cycle mixture preparation were assessed by measuring the in-cylinder fuel equivalence ratio (Φ) with a Fast Flame Ionization Detector (FFID) using four different fuels. The Engine Coolant Temperature (ECT) was varied between -6°C and 80°C. The Φ values increased with both ECT and amount of injected fuel mass. The delivery fraction (fraction of the injected fuel that went into the combustible charge), however, increased with ECT but decreased with increase in injected fuel. The minimum required injected mass to produce a combustible mixture increased sharply with decrease in ECT below 20°C. There was, however, no single fuel parameter that would correlate with the measurements over the entire temperature range. Instead, the minimum required injected mass correlated to different distillation points on the ASTM distillation curve; e.g. at ECT of -6°C, it correlated to T20; at 40°C, it correlated to T50. Based on this data, an empirical procedure was established to assess the change of minimum required injected mass when the fuel properties were changed. A thermodynamics model was used to simulate the first cycle mixture preparation. The results were in good agreement with the data and thus quantitatively connected the fuel properties to the mixture preparation behavior

Notes:

Vendor supplied data

Publisher Number:

2004-01-3057

Access Restriction:

Restricted for use by site license