Patent ID: 8024166
Filing Date: 2011-09-20
Classification: F02D

Abstract:
1. A method of real-time estimation of instantaneous engine speed produced by each cylinder of an internal-combustion engine including a crank shaft and at least one transmission system connected to the cylinders and a detector coupled to the transmission system performing real-time measurement of instantaneous engine speed comprising: a) constructing a physical model, representing in real time, dynamics of the transmission system according to an angle of the crankshaft, measurement, coefficients of a Fourier series analysis of the instantaneous engine speed produced by each cylinder, and a damping and a natural frequency of the transmission system; b) determining in real time the coefficients of the Fourier series analysis by coupling the model with an adaptive type-non-linear estimator; and c) carrying out real-time estimation of the instantaneous engine speed produced by each cylinder from the determined coefficients of the Fourier series analysis.