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The torque ratio concept for combustion monitoring of internal combustion engines

Ingemar Andersson (Institutionen för signaler och system, Signalbehandling) ; Mikael Thor (Institutionen för signaler och system, Reglerteknik) ; Tomas McKelvey (Institutionen för signaler och system, Signalbehandling)
Control Engineering Practice (0967-0661). Vol. 20 (2012), 6, p. 561–568.
[Artikel, refereegranskad vetenskaplig]

This work presents a method to analyze combustion events in an internal combustion engine, called the torque ratio concept. The method is based on crankshaft torque measurements, but an extension to angular speed measurements is possible. The torque ratio concept provides a parametrized model for the combustion progress from which e.g. combustion phasing can be extracted. The torque ratio concept is derived mathematically and related theoretically to other combustion analysis methods, such as pressure ratio and net heat release. Finally, analysis on recorded data from a five cylinder spark ignited engine verifies the relationships between the three methods. For combustion phasing, the 50% torque ratio is an equivalent measure to 50% pressure ratio and can be transformed into the 50% net heat release position by using a derived volume ratio function.

Nyckelord: System identification; Automotive application; Mechanical system; Engine management systems; Inverse filtering

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Denna post skapades 2012-03-12. Senast ändrad 2015-02-02.
CPL Pubid: 155829


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Institutioner (Chalmers)

Institutionen för signaler och system, Signalbehandling (1900-2017)
Institutionen för signaler och system, Reglerteknik (2005-2017)



Chalmers infrastruktur