SYSTEM OF ACTIVE SUPPRESSION OF INTAKE NOISE OF INTERNAL COMBUSTION ENGINE Russian patent published in 1997 - IPC

FIELD: manufacture of engines; active suppression of noise in intake and exhaust systems of internal combustion engines. SUBSTANCE: system includes dynamic loudspeaker 14, sound generator 19 with control unit 18 which is connected with engine speed sensor 15 and engine throttle valve 16. Sound generator 19 is connected with dynamic loudspeaker 14 radiating sound into zone of shear 12 of intake branch pipe 11. System is provided with pipe 13 which is used to connect dynamic loudspeaker with zone of shear of intake branch pipe. System may be also provided with microphone 21 mounted in zone of shear of intake branch pipe 11 and throttle valve position sensor 20. EFFECT: enhanced efficiency of noise suppression. 4 cl, 3 dwg