Particulate Matter and Hydrocarbon Emissions Measurements: Comparing First and Second Generation DISI with PFI in Single Cylinder Optical Engines

Document Number: 2006-01-1263

Date Published: April 2006

Author(s):
Philip Price - Univ. of Oxford
Richard Stone - Univ. of Oxford
Tony R. Collier - Ford Motor Co.
Marcus Timothy Davies - Ford Motor Co.

Abstract:
A Spray-Guided Direct Injection (SGDI) engine has been shown to emit less Particulate Matter (PM) than a first-generation (wall guided) Direct Injection Spark Ignition (DISI) engine. The reduction is attributed to the reduced incidence of fuel-wall impingement and higher fuel injection pressure. The extent to which this is true was investigated by comparison between single-cylinder SGDI and DISI engines. Both engines were also operated with conventional port injection to provide a baseline. Feedgas PM number concentration and size spectra were measured using a Cambustion differential mobility spectrometer for the fuels iso-octane and toluene with a range of Air-Fuel Ratios (AFRs), ignition and injection timings.

In addition to a reduction of the emitted PM mass, it was found that the PM emitted by the SGDI engine was dominated by nucleation mode PM, like a conventional Port Fuel Injection Spark Ignition (PFI-SI) engine, and the accumulation mode normally associated with DISI engines was not detected.

File Size: 544K
Product Status: In Stock

Included in: SP-2016

See other papers presented at SAE 2006 World Congress & Exhibition, April 2006, Detroit, MI, USA, Session: Direct Injection SI Engine Technology (Part 2 of 2)

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