The torque ratio concept for combustion monitoring of internal combustion engines
Journal article, 2012

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.

System identification

Automotive application

Engine management systems

Mechanical system

Inverse filtering

Author

Ingemar Andersson

Chalmers, Signals and Systems, Signalbehandling och medicinsk teknik, Signal Processing

Mikael Thor

Chalmers, Signals and Systems, Systems and control, Automatic Control

Tomas McKelvey

Chalmers, Signals and Systems, Signalbehandling och medicinsk teknik, Signal Processing

Control Engineering Practice

0967-0661 (ISSN)

Vol. 20 6 561-568

Areas of Advance

Transport

Subject Categories

Information Science

Signal Processing

DOI

10.1016/j.conengprac.2011.12.007

More information

Created

10/7/2017