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METHOD FOR PERFORMING AN ACTIVE PROFILING OF A SOUND EMITTED BY AN ENGINE AND CORRESPONDING PROFILING SYSTEM

  • US 20160192095A1
  • Filed: 12/21/2015
  • Published: 06/30/2016
  • Est. Priority Date: 12/24/2014
  • Status: Active Grant
First Claim
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1. A method for performing an active profiling of the sound emitted by a vehicle engine that issues first acoustic waves (EW) along a primary path of propagation of acoustic waves, in particular an exhaust duct,said method comprising the steps of:

  • injecting, via an acoustic-wave diffuser, into a secondary propagation path that merges in said primary path, second acoustic waves (MW), which are able to combine with said first acoustic waves (EW) in a merge point in said primary propagation path and to generate third resulting acoustic waves (RW);

    generating a driving signal (SP) for driving said diffuser by regulating the amplitude of harmonics of said driving signal (SP) as a function of reference acoustic waves (TW) and of a workpoint (WP) of the engine; and

    calculating equalization coefficients (α

    i, . . . , α

    m) to be applied to the amplitudes of said harmonics of said driving signal (SP) via a self-tuning procedure, which comprises comparing said reference acoustic waves (TW) with a simulation (SRW) of said resulting waves (RW), said simulation (SRW) being obtained by applying, to a simulation (MSW) of the second injected acoustic waves (MW), a model (H) of the secondary propagation path.

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