Sound generator for an anti-noise system for influencing exhaust noises and/or intake noises of a motor vehicle

A sound generator for an anti-noise system for influencing sound waves propagating in exhaust systems or intake systems of vehicles driven by an internal combustion engine, the sound generator comprising:

• an enclosure having a port opening for a fluid communication with an exhaust system or an intake system;
• a loudspeaker basket supported by the enclosure;
• a permanent magnet supported by the loudspeaker basket;
• a voice coil supported by a voice coil carrier, the voice coil being disposed in a constant magnetic field created by the permanent magnet;
• a membrane supported by the loudspeaker basket and connected to the voice coil, the membrane being located between the port opening of the enclosure and the permanent magnet, the membrane having an axial extent from a membrane base to a membrane top, and having a base radial dimension that is larger than a top radial dimension with the membrane top being spaced away, in an axial direction, from the permanent magnet a greater distance than the membrane base;
• and
• a stop damper made of an elastic material, wherein the loudspeaker basket further supports the stop damper, with the stop damper disposed inside the voice coil carrier between the membrane and the permanent magnet or between a cover cap covering the voice coil and the permanent magnet, and with the stop damper connected to the permanent magnet.

An anti-noise system for an intake system and/or an exhaust-gas system of a vehicle driven by an internal combustion engine, the anti-noise system comprising:

• an anti-noise controller;
• and
• at least one sound generator comprising:
• an enclosure having a port opening for a fluid communication with an exhaust system or an intake system;
• a loudspeaker basket supported by the enclosure;
• a permanent magnet supported by the loudspeaker basket;
• a voice coil supported by a voice coil carrier, the voice coil being disposed in a constant magnetic field created by the permanent magnet;
• a membrane supported by the loudspeaker basket and connected to the voice coil, the membrane being located between the port opening of the enclosure and the permanent magnet, the membrane having an axial extent, from a membrane base to a membrane top, and having a base radial dimension that is larger than a top radial dimension with the membrane top being spaced away, in an axial direction, from the permanent magnet a greater distance than the membrane base;
• and
• a bell mouth mounted to the enclosure at the position of the port opening, wherein the bell mouth can be connected via the port opening to the exhaust system or intake system, wherein the loudspeaker basket is supported by the enclosure via the bell mouth such that the membrane top is located within the bell mouth, wherein:
• the voice coil of the at least one sound generator is connected to the anti-noise controller;
• and
• the anti-noise controller is configured for generating at least one control signal and outputting the at least one control signal to the voice coil, with the control signal being adapted to cancel noise inside the intake system and/or the exhaust system at least partially or completely, when the voice coil is operated with the control signal.

A motor vehicle, comprising:

• an internal combustion engine with an engine control unit;
• an intake system and an exhaust system, both being in fluid communication with the internal combustion engine;
• and
• an anti-noise system for an intake system and/or an exhaust-gas system of a vehicle driven by an internal combustion engine, comprising:
• an anti-noise controller;
• and
• at least one sound generator comprising:
• an enclosure having a port opening for a fluid communication with an exhaust system or an intake system;
• a loudspeaker basket supported by the enclosure;
• a permanent magnet supported by the loudspeaker basket;
• a voice coil supported by a voice coil carrier, the voice coil being disposed in a constant magnetic field created by the permanent magnet;
• a membrane supported by the loudspeaker basket and connected to the voice coil, the membrane being located between the port opening of the enclosure and the permanent magnet, the membrane having an axial extent, from a membrane base to a membrane top, and having a base radial dimension that is larger than a top radial dimension with the membrane top being spaced away, in an axial direction, from the permanent magnet a greater distance than the membrane base;
• and
• a bell mouth mounted to the enclosure at the position of the port opening, wherein the bell mouth is connectable, via the port opening, to the exhaust system or intake system, wherein the loudspeaker basket is supported by the enclosure via the bell mouth such that the membrane top is located within the bell mouth, wherein:
• the voice coil of the at least one sound generator is connected to the anti-noise controller;
• the anti-noise controller is configured for generating at least one control signal and outputting the least on control signal to the voice coil, with the control signal being adapted to cancel noise inside the intake system and/or the exhaust system at least partially or completely, when the voice coil is operated with the control signal;
• the at least one sound generator of the anti-noise system is in fluid communication with the intake system and/or the exhaust system;
• and
• the anti-noise controller of the anti-noise system is connected to the engine control unit of the internal combustion engine of the vehicle.