G - Physics – 10 – K
Patent
G - Physics
10
K
172/30, 179/5
G10K 11/16 (2006.01) F01N 1/06 (2006.01) F02B 27/04 (2006.01)
Patent
CA 2039110
FMC 0218 PUS -15- 90-091 ABSTRACT A method and apparatus for muffling motor vehicle engine noise comprises conventional noise attenuation apparatus and techniques as well as a tuning circuit for delivering separate signal outputs to at least two transducers separated along the length of the exhaust conduit. A spacing between the trans- ducers corresponds to the range of tuned exhaust lengths required at various engine speeds within the operating range of the motor vehicle engine. The tuning circuit varies the strength of the signal de- livered to each of the transducers to vary the cancel- lation point within the conduit so as to vary the effective length of the conduit in a manner that main- tains a minimum or negative pressure pulse at the valve exhaust port and aids in the exhaustion of com- bustion gases from the cylinder. As a result, engine performance is improved throughout the operating range of the motor vehicle engine.
Ford Motor Company Of Canada Limited
Sim & Mcburney
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