Active noise control in Lexus?
08-15-09, 08:47 PM
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Active noise control in Lexus?
I was just reading some press info and I found out that the LX570/Land Cruiser are using active noice control to phase out engine drone.
Is this a first for TOYOTA and LEXUS
Quiet operation ensures comfortable driving by eliminating unpleasant noises while making the most of the powerful engine sound.
Active control engine mounts are employed to cancel out increased vibration when the engine is operating in cylinder idle mode. Engine vibration is estimated and actuators located inside the mounts expand and contract with the same phase and cycle to absorb vibration.
Active noise control is used to generate sound opposite in phase to the engine drone produced when cylinders are idling. The frequency to be attenuated is determined based on engine revolution pulses and a signal to cancel the frequency is generated via an audio speaker, thus reducing the drone.
http://www.diginfo.tv/vpr/landcruiser.html
Is this a first for TOYOTA and LEXUS
Quiet operation ensures comfortable driving by eliminating unpleasant noises while making the most of the powerful engine sound.
Active control engine mounts are employed to cancel out increased vibration when the engine is operating in cylinder idle mode. Engine vibration is estimated and actuators located inside the mounts expand and contract with the same phase and cycle to absorb vibration.
Active noise control is used to generate sound opposite in phase to the engine drone produced when cylinders are idling. The frequency to be attenuated is determined based on engine revolution pulses and a signal to cancel the frequency is generated via an audio speaker, thus reducing the drone.
http://www.diginfo.tv/vpr/landcruiser.html
08-15-09, 09:58 PM
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Sorry about the duplicate. If a Mod can lock or delete.
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