Method and device for blanking out interference noise during knock recording in an internal combustion engine
AssigneeRobert Bosch GmbH
InventorsJuergen Sauler, Michael Baeuerle
Life of this patent
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Abstract
The present invention creates a method and an apparatus for blanking out interfering noise in connection with detecting knocking in an internal combustion engine. The following functions are performed: Forming a sensor signal integral value (KI) during a measurement time slot (MF) of the sensor signal of a knocking sensor; forming a correction value (DKI) for the sensor signal integral value (KI) corresponding to an interfering noise during the measurement time slot (MF); and subtracting the correction value (DKI) from the sensor signal integral value (KI) for forming a corrected sensor signal integral value (KI′) with the interfering noise blanked out.
Claims11
A method of blanking out interfering noise in connection with detecting knocking in an internal combustion engine, comprising the steps of forming a sensor signal integral value during a measurement time slot of the sensor signal of a knocking sensor;
- forming a correction value for the sensor signal integral value corresponding to an interfering noise during the measurement time slot;
- subtracting the correction value from the sensor signal integral value for forming a corrected sensor signal integral value with an interfering noise blanked out, said forming of the correction value including forming a maximal integral interference signal component, detecting an overlapping time slot between the measurement time slot and an interference time slot, and weighting a maximum integral interference signal component with a weighting factor which is formed on a basis of the overlapping time slot.
An apparatus for blanking out interfering noise in connection with detecting knocking in an internal combustion engine, comprising a device for forming a sensor signal integral value during a measurement time slot of the sensor signal of a knocking sensor;
- a device for forming a correction value for the sensor signal integral value corresponding to an interfering noise during the measurement time slot;
- and a device for subtracting the correction value from the sensor signal integral value for forming a corrected sensor signal integral value with the interfering noise blanked out, said device for forming the correction value including means for forming a maximum integral interference signal component, means for detecting an overlapping time slot between the measurement time slot and an interference time slot, means for forming a weighting factor based on the overlapping time slot, and means for weighting the maximum integral interference signal component by multiplication by the weighting factor.
Dependencies are inferred from the claim text.