NOISE REDUCTION FOR AN INTERNAL COMBUSTION ENGINE
First Claim
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1. A system for reducing noise associated with an internal combustion engine, the system comprising:
- an internal combustion engine for operating at an operational speed of an engine shaft;
an exhaust system associated with a resonant cavity at one or more desired acoustic wavelengths of attenuation;
a microphone placed in proximity to the exhaust system for detecting a noise level associated with the exhaust system; and
a controller for controlling the operational speed of the engine based on the detected noise level and a desired noise level.
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Abstract
A method and system for reducing noise associated with an internal combustion engine comprises operating an engine at an initial speed. An exhaust system has a resonant cavity to attenuate exhaust noise. A microphone detects a sound level at or near an exhaust system of the engine operated the initial speed. A controller controls or adjusts the initial speed to a revised speed if the detected sound level does not meet or fall below a desired sound level.
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Citations
24 Claims
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1. A system for reducing noise associated with an internal combustion engine, the system comprising:
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an internal combustion engine for operating at an operational speed of an engine shaft; an exhaust system associated with a resonant cavity at one or more desired acoustic wavelengths of attenuation; a microphone placed in proximity to the exhaust system for detecting a noise level associated with the exhaust system; and a controller for controlling the operational speed of the engine based on the detected noise level and a desired noise level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for reducing noise associated with an internal combustion engine, the method comprising:
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operating an engine at an initial speed; providing an exhaust system having a resonant cavity for noise reduction; detecting a sound level at or near an exhaust system of the engine operated at the initial speed; and adjusting the initial speed to a revised speed if the detected sound level does not meet or fall below a desired sound level. - View Dependent Claims (16, 17)
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18. A method for reducing noise associated with an internal combustion engine, the method comprising:
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operating an engine at an initial speed; providing an exhaust system having a resonant cavity for noise reduction; detecting a sound level at or near an exhaust system of the engine operated the initial speed; and controlling the operational speed based on the detected noise level and a desired noise level. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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Specification