Device for knock detection in internal combustion engine
First Claim
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1. A device for detecting knocking in an internal combustion engine, comprising a knocking sensor for sensing knocking of said internal combustion engine and producing output signals;
- filter devices for filtering the output signals of said knocking sensor;
an evaluation facility for obtaining the filtered signals from said devices and evaluating said filtered signals;
means for continuously determining at least one of a frequency and a phase of the output signals of said knock sensor, said evaluation facility evaluating a change of the frequency for the purpose of the knock detection; and
means for controlling a center frequency of at least one of said filter devices depending on a crankshaft angle, said controlling means controlling the center frequency of said at least one of filter device within a combustion cycle of the internal combustion engine so that the center frequency of said at least one filter device reduces in response to an increase of the crankshaft angle.
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Abstract
A device for detecting a knocking in an internal combustion engine has an evaluating facility, a knock sensor for sensing knocking of an internal combustion engine and producing output signals of the knocking sensor, an evaluation facility for obtaining the filtered signals from the filter from the devices and evaluating the same and a device for controlling a center frequency of at least one of the filter devices depending on at least one operating parameter of the internal combustion engine.
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Citations
5 Claims
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1. A device for detecting knocking in an internal combustion engine, comprising a knocking sensor for sensing knocking of said internal combustion engine and producing output signals;
- filter devices for filtering the output signals of said knocking sensor;
an evaluation facility for obtaining the filtered signals from said devices and evaluating said filtered signals;
means for continuously determining at least one of a frequency and a phase of the output signals of said knock sensor, said evaluation facility evaluating a change of the frequency for the purpose of the knock detection; and
means for controlling a center frequency of at least one of said filter devices depending on a crankshaft angle, said controlling means controlling the center frequency of said at least one of filter device within a combustion cycle of the internal combustion engine so that the center frequency of said at least one filter device reduces in response to an increase of the crankshaft angle. - View Dependent Claims (2, 3, 4, 5)
- filter devices for filtering the output signals of said knocking sensor;
Specification