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Method and apparatus for actively influencing the intake noise of an internal combustion engine

  • US 6,688,422 B2
  • Filed: 04/12/2002
  • Issued: 02/10/2004
  • Est. Priority Date: 10/15/1999
  • Status: Expired due to Term
First Claim
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1. An apparatus for actively influencing intake noise of an internal combustion engine by generating a correcting noise and superimposing the correcting noise on an intake noise produced by the engine, said apparatus comprising:

  • a control system for processing an engine speed signal D, at least one further engine parameter P, a reference noise signal S and an actual noise signal I to generate a control signal A, an engine speed signal source connected to the control system for providing said engine speed signal D, a noise sensor connected to said control system for sensing an actual noise and for producing said actual noise signal I, and an electromechanical converter connected to an output of said control system for receiving said control signal A and generating the correcting noise to be superimposed on the intake noise in dependence on said control signal A, wherein the control system comprises;

    means for generating the control signal A with a frequency dependent on the engine speed signal D, means for comparing the actual noise signal I and the reference noise signal S and generating a comparison signal V, and means for adjusting the level and phase of the control signal A in dependence on a comparison signal V.

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