Particulate Characteristics for Varying Engine Operation in a Gasoline Spark Ignited, Direct Injection Engine Univ. of Wisconsin-Madison

Format:

Conference/Event

Author/Creator:

Farron, Farron, author.

Contributor:

Andrie, Michael

Foster, David E.

Krieger, Roger

Matthias, Nicholas

Najt, Paul

Narayanaswamy, Kushal

Solomon, Arun

Zelenyuk, Alla

Conference Name:

SAE 2011 World Congress & Exhibition (2011-04-12 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2011

Summary:

The objective of this research is a detailed investigation ofparticulate sizing and number count from a spark-ignited,direct-injection (SIDI) engine at different operating conditions.The engine is a 549 [cc] single-cylinder, four-valve engine with aflat-top piston, fueled by Tier II EEE. A baseline engine operatingcondition, with a low number of particulates, was established andrepeatability at this condition was ascertained. This baselinecondition is specified as 2000 rpm, 320 kPa IMEP, 280 [°bTDC] endof injection (EOI), and 25 [°bTDC] ignition timing.The particle size distributions were recorded for particle sizesbetween 7 and 289 [nm]. The baseline particle size distribution wasrelatively flat, around 1E6 [dN/dlogDp], for particle diametersbetween 7 and 100 [nm], before dropping off to decreasing numbersat larger diameters. Distributions resulting from a matrix ofdifferent engine conditions were recorded. These varied parametersinclude load, air-to-fuel ratio (A/F), spark timing, injectiontiming, fuel rail pressure, and oil and coolant temperatures. Mostconditions resulted with uni-modal type distributions usually withan increase in magnitude of particles in comparison to thebaseline, with the exception of lean operation with retardedignition timing. Further investigation revealed high sensitivity ofthe particle number and size distribution to changes in the enginecontrol parameters. There was also a high sensitivity of theparticle size distributions to small variations in A/F, ignitiontiming, and EOI. Investigations revealed the possibility ofemissions oxidation in the exhaust and engine combustioninstability at later EOI timings which therefore ruled out late EOIas the benchmark condition. Attempts to develop this benchmarkrevealed engine sensitivity to A/F and ignition timing, especiallyat later EOI operation

Notes:

Vendor supplied data

Publisher Number:

2011-01-1220

Access Restriction:

Restricted for use by site license