REAL TIME KNOCK DETECTION WITH DFT-BASED TIME-FREQUENCY ANALYSIS

Abstract

New generations of spark ignition engines require a correct ignition adjustment to guarantee optimal performance. In this paper, we address the challenge of knock detection improvements with time-frequency analysis. Two real time knock detection methodologies based on the sliding Discrete Fourier Transform and the pseudo Wigner-Ville distribution are exposed. Their relative performances and robustness are compared in real time simulation on both production (vibration signals from accelerometer sensors) and modelled data. 1