Overload protection for loudspeakers in exhaust systems

摘要

A method for controlling an anti-sound system includes measuring sound within an exhaust system of a vehicle, calculating a control signal based on the measured sound, calculating a thermal load to be expected of the at least one loudspeaker of the anti-sound system during operation with a control signal based on a mathematical model of a thermal behavior of the loudspeaker and/or a mechanical load to be expected of the at least one loudspeaker of the anti-sound system based on a mathematical model of a mechanical behavior the loudspeaker, comparing the calculated thermal and/or mechanical load with a specified maximum load, operating the loudspeaker with the control signal, if the calculated thermal and/or mechanical load is smaller than or equal to the maximum load, and changing the spectrum of the control signal, in order to receive a corrected control signal, if the calculated load is greater than the maximum load.

主权项

1. A method for controlling an anti-sound system for an exhaust system of a vehicle operated by a combustion engine, for generating an anti-airborne sound in the exhaust system based on measured sound, in order to cancel airborne sound generated by the combustion engine and conducted in the exhaust system in the vicinity of the position in the exhaust system at which the sound is measured at least partially and preferably completely in amount and phase, the method comprising the steps of:
measuring sound inside the exhaust system; calculating a control signal based on the measured sound; calculating at least one of an expected thermal load of the least one loudspeaker of the anti-sound system during the operation with the control signal based on a mathematical model of a thermal behavior of the loudspeaker and an expected mechanical load of the at least one loudspeaker of the anti-sound system during the operation with the control signal based on a mathematical model of a mechanical behavior the loudspeaker; comparing the calculated expected thermal load or the calculated expected mechanical load with a specified maximum load; operating the loudspeaker with the control signal, if the calculated expected thermal load or the calculated expected mechanical load is smaller than or equal to the maximum load; and changing a spectrum of the control signal to obtain a corrected control signal if the calculated thermal load or the calculated mechanical load is greater than the maximum load, and operating the loudspeaker with the corrected control signal.