G Index: A Novel Knock Detection Method that is Simpler and Calibration-Free, Based on Angular Position of Combustion Parameters Federal University of Rio Grande do Sul

Format:

Book

Conference/Event

Author/Creator:

Golke, Diego, author.

Contributor:

Lanzanova, Thompson

Martins, Mario

silveira, Juliano

Conference Name:

WCX SAE World Congress Experience (2022-04-05 : Detroit & Online, Michigan, United States)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2022

Summary:

Stringent emission legislations have pushed engine operation to borderline knock. Knocking combustion limits engine efficiency, putting a threshold in carbon emission reduction that impairs further decarbonization of the transport sector. In this way, online knock monitoring is very important during engine development and calibration to allow operation with higher efficiency levels. Commonly, knock detection methods require complex calculations with high computational cost. Furthermore, these methods normally need previous calibration of a threshold value for each specific engine to indicate the knock limit, requiring important engineering resources and time. Hence, this paper proposes a novel methodology for knock detection that is simple, does not require prior calibration and can be used for sensorless knock detection. The method is applied by relating the crank angle of maximum pressure rise rate (AMPRR) with the angle of 50% of fuel mass burned (CA50), the so-called G Index (GI). The results were compared in respect to the ringing intensity methodology, showing good correlation in detecting knocking combustion. In general, the results showed that a negative average value means knock-free operation and a positive average value means a knocking combustion operating condition

Notes:

Vendor supplied data

Publisher Number:

2022-01-0479

Access Restriction:

Restricted for use by site license