Patent Document ID: 9334799
Application ID: 13486441
Patent Flag: 1

Claim One:
1. A method of estimating and controlling in real time intensity of knocking of an internal combustion engine comprising a cylinder-head, at least one cylinder and at least one vibration sensor providing a continuous vibration signal representative of vibrations in the at least one cylinder at an output of the cylinder-head which signal is a function of the crankshaft angle, comprising: constructing a wave equation model of the cylinder-head based on a physical model describing propagation of waves in a solid medium; determining coefficients of a Fourier decomposition of the vibration signal in real time by inverting dynamics of the wave equation model with an estimator; computing energy contained in the vibration signal by summing squares of the coefficients of the Fourier decomposition; determining in real time a parameter correlated with intensity of knocking equal to a square root of a maximum of the energy; and using the real time parameter correlated with intensity of knocking in controlling the combustion of the internal combustion engine to control the intensity of knocking in real time.