Method for influencing sound

A technology of sound and means of transportation, applied in the direction of noise reduction devices, sound-generating devices, active noise control, etc.

Inactive Publication Date: 2008-06-25
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] A disadvantage of the prior art is that the adjustment of the sound generation is only possible to a very limited adaptation to the ambient conditions, the driving situation and the driver's preferences

Method used

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  • Method for influencing sound
  • Method for influencing sound

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Embodiment Construction

[0019] In FIG. 1 , an internal combustion engine 1 of a vehicle is connected to a central muffler 2 followed by an end muffler 3 . The sound influencing device comprises three controllable digital filters 4a, 4b and 4c tuned according to the fundamental frequency and two harmonic frequencies (integer multiples of the fundamental frequency). The signal of the digital filter is collected and amplified in the power amplifier 5 in order to control the sound transducer, more precisely the loudspeaker 6 , with the sound influencing signal thus generated. The loudspeaker 6 is built on the end silencer 3 and thus influences the noise leaving the end silencer 3 . This noise is picked up by the microphone 7 which is built in at the outlet of the exhaust system consisting of the central silencer 2 and the end silencer 3 . The sound influencing device also includes a signal generator 8 for generating a fundamental frequency as a function of the engine speed of the internal combustion eng...

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Abstract

A method for influencing sound in an aggregate in the periphery of an internal combustion engine of a vehicle, particularly in an exhaust system of the internal combustion engine, a sound-influencing signal being generated on the basis of a detected sound emission of the aggregate and being injected into the aggregate, in which additionally, the sound-influencing signal is generated as a function of a parameter that is independent of the operating point of the internal combustion engine.

Description

technical field [0001] The invention relates to a method for influencing sound in an assembly of an internal combustion engine peripheral of an internal combustion engine of a vehicle, in particular in an exhaust system of the internal combustion engine, wherein a sound influencing signal is generated as a function of a detected sound output of the assembly, and Coupled into the unit. The invention also relates to a sound influencing device for carrying out such a method and a computer program having a program code for carrying out all the steps of such a method. Background technique [0002] It is known in the prior art to influence undesired sound signals by utilizing the active noise influence of a suitably compensated sound field. For this purpose, an acoustic influence signal is generated in the control loop on the basis of the sound signal received by the microphone, which is in turn coupled into the muffler of the exhaust system via an acoustic converter. The contro...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): F01N1/06G10K11/175
CPCF01N13/009G10K2210/51G10K11/1788F01N13/02G10K2210/1282F02D2200/701F01N1/065G10K11/17823G10K11/17854G10K11/17883
InventorU·卡斯纳
OwnerROBERT BOSCH GMBH