Road and engine noise control

A road and engine noise control method comprising:

• directly picking up road noise, via a first acceleration sensor, from a structural element of a vehicle to generate a first sense signal representative of the road noise,
• directly picking up engine noise, via a second acceleration sensor that is attached to an engine, from the engine of the vehicle to generate a second sense signal representative of non-harmonic engine noise;
• combining the first sense signal and the second sense signal to provide a combination signal representing the combination of the first sense signal and the second sense signal;
• radiating, via a loudspeaker, anti-noise to a listening position in an interior of the vehicle in response to an anti-noise signal;
• wherein the first acceleration sensor is attached to the structural element of the vehicle, and
• generating, via a third sensor that includes a revolutions per minute (RPM) signal including a single fundamental frequency, the RPM signal being indicative of the RPM of the engine at the single fundamental frequency;
• wherein the second acceleration sensor is directly attached to the engine to generate the second sense signal that is indicative of the non-harmonic engine noise that is not included in the RPM signal and to further sense engine noise components related to one or more of bearing play, chain slack, and valve bounce;
• and
• generating the anti-noise signal via broadband active noise control filtering for transmission to the loudspeaker with the combination signal and the RPM signal, wherein the anti-noise signal accounts for at least the RPM of the engine and for the non-harmonic engine noise that is not included in the RPM signal.

A road and engine noise control system comprising:

• a first sensor including a first acceleration sensor configured to pick up road noise from a structural element of a vehicle and to generate a first sense signal indicative of the road noise;
• a second sensor including a second acceleration sensor attached to an engine and configured to pick up engine noise from the engine of the vehicle and to generate a second sense signal indicative of non-harmonic engine noise;
• a combiner configured to combine the first sense signal and the second sense signal to provide a combination signal;
• a loudspeaker configured to radiate anti-noise to a listening position in an interior of the vehicle in response to an anti-noise signal;
• wherein the first acceleration sensor is attached to the structural element of the vehicle, and
• wherein a revolutions per minute (RPM) sensor is positioned about the engine and is being configured to generate an RPM signal including a single fundamental frequency, the RPM signal being indicative of the RPM of the engine at the single fundamental frequency;
• wherein the second acceleration sensor is directly attached to the engine to generate the second sense signal that is indicative of the non-harmonic engine noise that is not included in the RPM signal and to further sense engine noise components related to one or more of bearing play, chain slack, and valve bounce;
• and
• a broadband active noise control filter configured to generate the anti-noise signal for transmission to the loudspeaker with the combination signal and the RPM signal, wherein the anti-noise signal accounts for at least the RPM of the engine and for the non-harmonic engine noise that is not included in the RPM signal.