The torque ratio concept for combustion monitoring of internal combustion engines

• 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.

Ämnesord

NATURVETENSKAP  -- Data- och informationsvetenskap -- Systemvetenskap, informationssystem och informatik (hsv//swe)

NATURAL SCIENCES  -- Computer and Information Sciences -- Information Systems (hsv//eng)

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik -- Signalbehandling (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering -- Signal Processing (hsv//eng)

Nyckelord

System identification

Automotive application

Engine management systems

Mechanical system

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