Exhaust Particulate Emissions from a Direct Injection Spark Ignition Engine University of Cambridge

Format:

Conference/Event

Author/Creator:

Graskow, B. R., author.

Conference Name:

International Congress & Exposition (1999-03-01 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1999

Summary:

Experiments were performed to measure the average and time-resolved particle number emissions and number-weighted particle size distributions from a gasoline direct injection (GDI) engine. Measurements were made on a late model vehicle equipped with a direct injection spark ignition engine. The vehicle was placed on a chassis dynamometer, which was used to load the engine to road load at five different vehicle speeds ranging from 13 - 90 km/hr. Particle number emissions were measured using a TSI 3020 condensation nucleus counter, and size distributions were measured using a TSI 3934 scanning mobility particle sizer.Average polydisperse number concentration was found to increase from 1.1 108 particles/cm3 at 13 km/hr to 2.8 108 particles/cm3 at 70 km/hr. Under a closed-loop, stoichiometric homogeneous charge operating mode at 90 km/hr, number emissions fell to 9.3 107 particles/cm3 (at all other operating conditions, the engine was in a lean stratified charge operating mode). Time-resolved number emissions were found to be steady at 13, 50, and 70 km/hr, unsteady at 90 km/hr, and exhibited periodic behavior at 32 km/hr.For the operating conditions ranging from 32 - 90 km/hr, the number weighted size distributions were well represented by broad (geometric standard deviation 1.8) monomodal lognormal distribution functions. The number-weighted geometric mean diameter ranged from 68 nm at 32 km/hr to 88 nm at 90 km/hours For the 13 km/hr operating condition, the size distribution was bimodal. In addition to the broad accumulation mode observed at the other operating conditions, the 13 km/hr condition also contained a very strong nuclei mode with a geometric standard deviation of approximately 1.3 and a number-weighted geometric mean diameter of approximately 20 nm

Notes:

Vendor supplied data

Publisher Number:

1999-01-1145

Access Restriction:

Restricted for use by site license