A Non Intrusive Method for Knock Detection Based on the Exhaust Gas Temperature

This paper focuses on the modelling of the exhaust gas temperature of a spark ignition engine in order to propose a new and non-intrusive method of knock detection. A zero-dimensional model is developed and accounts for the heat transfer amplification due to knock. The heat transfer coefficient is a function of the mass burnt rate because knock intensity is linked to the autoignited mass of fuel. The decrease of exhaust gas enthalpy due to knock is pointed out and analysed for a large tunings and fuel composition range. The numerical results show that a knock indicator based on the calculated maximal temperature and the measured average exhaust gas temperature as well as engine tunings can be developed.