Exhaust-Gas Dynamics Model for Identification Purposes

The burned gas remaining in the cylinder after the exhaust stroke of an SI engine, i.e. the residual gas fraction, has a significant influence on both the torque production and the composition of the exhaust gas. This work investigates the behavior of the residual gas fraction over the entire operating range of the engine. A combined discrete-continuous linear model is identified, which describes the dynamic effects of the gas composition from when the gases enter the cylinder up to the measurement with a specific sensor. In this investigation, that sensor is a fast NO measurement device. The system is modelled by three elements in series: the in-cylinder mixing, the transport delay, and the exhaust mixing. The resulting model contains three elements in series connection: the in cylinder mixing, the transport delay, and the exhaust gas mixing. The model is able to calculate the fuel mass entering the cylinder during a fuel injection transient. The results show a good correlation between measurements and simulations. Additionally, this model provides an explanation for the often observed second order in the wall-wetting dynamics.

• Record URL:
  • https://doi.org/10.4271/2003-01-0368
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/01487191
• Supplemental Notes:
  • Abstract reprinted with permission of SAE International.
• Authors:
  • Locatelli, Marzio
  • Onder, Christopher H
  • Geering, Hans P
• Conference:
  • SAE 2003 World Congress & Exhibition
  • Location: Detroit Michigan, United States
  • Date: 2003-3-3 to 2003-3-6
• Publication Date: 2001-10-28

Language

• English

Media Info

• Media Type: Web
• Serial:
  • SAE Technical Paper
  • Publisher: Society of Automotive Engineers (SAE)
  • ISSN: 0148-7191
  • EISSN: 2688-3627
  • Serial URL: http://papers.sae.org/

Subject/Index Terms

• TRT Terms: Engine cylinders; Fuel injection; Gases; Spark ignition engines
• Subject Areas: Highways; Vehicles and Equipment;

Filing Info

• Accession Number: 01801854
• Record Type: Publication
• Source Agency: SAE International
• Report/Paper Numbers: 2003-01-0368
• Files: TRIS, SAE
• Created Date: Dec 9 2021 10:24AM