H - Electricity – 04 – R
Patent
H - Electricity
04
R
172/30, 179/5
H04R 1/42 (2006.01) F01N 1/02 (2006.01) F01N 1/06 (2006.01) G10K 11/178 (2006.01) H04R 3/02 (2006.01)
Patent
CA 2038439
FMC 0216 PUS -14- 90-027 Abstract An active muffler for motor vehicle exhaust conduits comprises a pulse tracking sensor generating a signal input to an electronic control for actuating an acoustic transducer imposing cancellation pulses upon the sound pressure pulse train travelling through the conduit. The system includes a preconditioning circuit for reducing the crest factor of the waveform pulse train travelling through the exhaust conduit by introducing negative pressure pulses into the exhaust conduit. Preferably, a digitally controlled one bit injector includes a fluid outlet in communication with the exhaust conduit and an inlet in communication with a vacuum source such as the intake manifold of the motor vehicle engine. Accordingly, the amplifier and the transducer of the acoustic actuator can be sub- stantially downsized for employment in mass produced motor vehicles.
Ford Motor Company Of Canada Limited
Sim & Mcburney
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