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الإعدادات

الإعدادات

1. US5119902 - Active muffler transducer arrangement

المكتب الولايات المتحدة الأمريكية
رقم الطلب 07514624
تاريخ الطلب 25.04.1990
رقم النشر 5119902
تاريخ النشر 09.06.1992
رقم التسليم 5119902
تاريخ التسليم 09.06.1992
نوع النشر A
التصنيف الدولي للبراءات
Description not available in lang ar
Description not available in lang ar
Description not available in lang ar
F01N 1/06
G10K 11/00
G10K 11/178
التصنيف التعاوني للبراءات
F01N 1/065
G10K 11/178
G10K 2210/112
G10K 2210/12822
G10K 2210/3045
G10K 2210/3227
مودعي الطلبات Ford Motor Company
المخترعين Geddes Earl R.
الوكلاء Mollon Mark L.
May Roger L.
الاسم
(EN) Active muffler transducer arrangement
الملخص
(EN)

An active muffler for use in motor vehicles comprises a sensor, an electronic control responsive to the signal generated by the sensor for producing a drive signal delivered to a transducer which emits cancellation pulses phased 180.degree. from the sound pressure pulses passing through a conduit, where both front and rear sides of the transducer are acoustically coupled to the conduit to improve the efficiency of the transducer operation. Preferably, the acoustic coupling comprises an enclosed chamber including a port for communicating with the conduit which can be tuned to resonate at predetermined frequencies. When both sides of the transducer are so coupled to the conduit, the transducer has increased efficiency over a broad band of frequencies, and the frequency band can be broadened at the low end as required to accommodate the frequencies generated by a source of noise. The transducer mounting arrangement according to the present invention is particularly suitable for use in adapting noise cancellation techniques to replace passive mufflers on motor vehicles.