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Numrering	Referens	Omslagsbild	Hitta
1.	Andersson, Ingemar, 1969, et al. (författare) The torque ratio concept for combustion monitoring of internal combustion engines 2012 Ingår i: Control Engineering Practice. - : Elsevier BV. - 0967-0661. ; 20:6, s. 561-568 Tidskriftsartikel (refereegranskat)abstract This work presents a method to analyze combustion events in an internal combustion engine, called the torque ratio concept. The method is based on crankshafttorque measurements, but an extension to angular speed measurements is possible. The torque ratio concept provides a parametrized model for the combustionprogress from which e.g. combustion phasing can be extracted. The torque ratio concept is derived mathematically and related theoretically to other combustionanalysis 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.

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