Method of influencing the exhaust noise of a motor vehicle and exhaust system for a motor vehicle

An exhaust system for a motor vehicle, comprising:

• an exhaust branch having exhaust noise that includes at least three components comprising harmonic oscillations as a first component, static noise as a second component, and as a third component dynamic noise caused by momentary peaks in flow velocity of exhaust gas in the exhaust branch of the motor vehicle;
• a loudspeaker associated with the exhaust branch;
• and
• a control unit controlling sound emission of the loudspeaker, the control unit being adapted to generate colored noise package signals and to transmit the colored noise package signals to the loudspeaker individually or so as to superimpose a basic signal, the loudspeaker emitting sound waves corresponding to the individual colored noise package signals or the basic signal superimposed with the colored noise package signals into the exhaust branch, wherein each of the colored noise package signals is emitted by the loudspeaker as a time-limited sound wave package, which creates another dynamic noise that is in addition to the dynamic noise caused by momentary peaks, wherein the control unit generates the basic signal, the basic signal featuring a superposition of harmonic oscillations which correspond to half the rotational frequency of an engine and higher orders thereof, and wherein amplitudes of envelopes of the colored noise package signals are selected as a function of the amplitude of the basic signal.

A method of influencing the exhaust noise of a motor vehicle having at least three components comprising harmonic oscillations as a first component, static noise as a second component, and as a third component dynamic noise caused by momentary peaks in flow velocity of exhaust gas in an exhaust branch of the motor vehicle, in which

• (a) a control unit generates colored noise package signals,
• (b) the control unit transmits the colored noise package signals individually or so as to superimpose a basic signal to a loudspeaker associated with the exhaust branch of the motor vehicle, and
• (c) the loudspeaker converts the individual colored noise package signals or the basic signal superimposed with the colored noise package signals into sound waves,
• wherein each of the colored noise package signals is emitted by the loudspeaker as a time-limited sound wave package creating another dynamic noise that is in addition to the dynamic noise caused by momentary peaks, wherein the control unit generates the basic signal, the basic signal featuring a superposition of harmonic oscillations which correspond to half the rotational frequency of an engine and higher orders thereof, and wherein amplitudes of envelopes of the colored noise package signals are selected as a function of the amplitude of the basic signal.