Experimental Determination of Knock in Gas SI Engine

Determination of knock start for any engine tuning remains a difficult work for many engine manufacturers. This study investigates different combinations of existing knock indices in order to produce an upgraded indicator easier to calibrate. Experiments were conducted on a single-cylinder gas engine bounded to combined heat and power (CHP). Effects of spark advance, volumetric efficiency and equivalent ratio are studied under constant speed operation. The ratio IMPO / MAPO (with IMPO defined as the Integral of Modulus of Pressure Oscillation and MAPO as the Maximum Amplitude of Pressure Oscillation) is proposed as a suitable indicator. In any engine setting, it remains constant under non knocking conditions. When knock occurs, a model deduced from dimensionless analysis allows to determine the oversteps of Knock Limited Spark Timing from IMPO / MAPO measurements with an accuracy lower than 1 CA.

• Record URL:
  • https://doi.org/10.4271/2001-28-0022
• 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:
  • Brecq, G
  • Bellettre, J
  • Tazerout, M
• Conference:
  • SIAT 2001
  • Location: Pune , India
  • Date: 2001-1-10 to 2001-1-13
• Publication Date: 2001-1-10

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 knock; Gasoline engines; Pressure; Suppliers
• Subject Areas: Highways; Vehicles and Equipment;

Filing Info

• Accession Number: 01799474
• Record Type: Publication
• Source Agency: SAE International
• Report/Paper Numbers: 2001-28-0022
• Files: TRIS, SAE
• Created Date: Dec 9 2021 10:20AM