Device and method for active noise cancellation in exhaust gas channel of a combustion engine
First Claim
1. A device for active noise cancellation in an exhaust gas channel of a combustion engine, comprising,a sound-receiving unit configured to receive a sound signal from the exhaust gas channel;
- a frequency-generating unit configured to generate at least a first frequency signal to influence the sound generated in the exhaust gas channel; and
a calculation unit configured to receive the sound signal and generate control signals to influence amplitude and phase of the first frequency signal, wherein the calculation unit also calculates a temperature information of an exhaust gas in the exhaust gas channel.
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Abstract
In a method and a device for canceling the noise in an exhaust gas channel of a vehicle, a noise signal is received from the exhaust gas channel using a sound sensor, and a frequency signal which has the same amplitude and the opposite phase as the noise signal is generated. The generated frequency signal is acoustically mixed with the noise signal in the exhaust gas channel using a sound converter, there by reducing the noise in the exhaust gas channel. In addition, the temperature in the exhaust gas channel is calculated based on the received sound signal.
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Citations
9 Claims
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1. A device for active noise cancellation in an exhaust gas channel of a combustion engine, comprising,
a sound-receiving unit configured to receive a sound signal from the exhaust gas channel; -
a frequency-generating unit configured to generate at least a first frequency signal to influence the sound generated in the exhaust gas channel; and a calculation unit configured to receive the sound signal and generate control signals to influence amplitude and phase of the first frequency signal, wherein the calculation unit also calculates a temperature information of an exhaust gas in the exhaust gas channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. Method of operating a combustion engine, comprising:
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receiving, using a sound sensor, a sound signal from an exhaust-gas channel of the combustion engine; based on the received sound signal, generating control signals configured to influence amplitude and phase of a frequency signal; acoustically coupling the frequency signal with the sound signal generated in the exhaust gas channel to influence the sound signal generated in the exhaust gas channel; and calculating a temperature information of an exhaust gas based on the received sound signal and pre-stored data records.
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Specification