Dynamic knock detection and quantification in a spark ignition engine by means of a pressure based method

Experimental investigation on the knocking combustion characteristics of n-butanol gasoline blends in a DISI engine

“…(4), the resonant modes can be estimated by comparing the calculated values with FFT results. The local sound speed in the combustion chamber is estimated at 950 m/s for gasoline-air mixture [33,48]. And then, the calculation of different resonance modes indicate that characteristic frequencies of the first radial mode (1, 0), the second radial mode (2, 0) and the first circumferential mode (0, 1) show good agreement with those obtained by FFT.…”

Numerical analysis of knock during HCCI in a high compression ratio methanol engine based on LES with detailed chemical kinetics

“…Knock can be analyzed based on the local pressures of combustion chamber [36,37]. The knock intensity can be defined as the intensity of the amplitude of pressure oscillation.…”

In-cylinder pressure-based direct techniques and time frequency analysis for combustion diagnostics in IC engines

“…The demand for prompt engine control requires the real-time analysis of pressure signals for different purposes. A new method that is able to resolve dynamic knock intensity related to each individual engine cycle, is reported in [3]. The in-cylinder pressure can also be used to obtain a refined closed-loop function in order to control the low temperature combustion mode in Euro 6-compliant diesel engines under steady-state and transient conditions [4].…”