Device for processing a knock sensor signal
First Claim
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1. A device for the processing of a knock sensor signal during the detection of knocking in an internal combustion engine, comprising the following signal processing components arranged in this order:
- an analog filter,a sigma-delta modulator designed for analog-digital conversion,a CIC filter designed to decimate the sampling rate,whereindownstream of the CIC filter a digital filter with bandpass characteristics is arranged, andthe CIC filter has n integrator levels and n+1 COMB levels, n being a natural number.
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Abstract
For the processing of a knock sensor signal during the detection of knocking in a combustion engine, in order to allow for inexpensively designed, efficient, and accurate bandpass filtering, a signal processing device (10) has an analog filter (20), a sigma-delta modulator (30) designed for analog-digital conversion, a CIC filter (40) designed to decimate the sampling rate, and a digital filter (50).
30 Citations
20 Claims
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1. A device for the processing of a knock sensor signal during the detection of knocking in an internal combustion engine, comprising the following signal processing components arranged in this order:
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an analog filter, a sigma-delta modulator designed for analog-digital conversion, a CIC filter designed to decimate the sampling rate, wherein downstream of the CIC filter a digital filter with bandpass characteristics is arranged, and the CIC filter has n integrator levels and n+1 COMB levels, n being a natural number. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for processing of a knock sensor signal during the detection of knocking in an internal combustion engine, comprising:
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an analog filtering a sensor signal, converting said analog filtered signal by a sigma-delta modulator into a digital signal, decimate the sampling rate of said digital signal by a CIC filter having n integrator levels and n+1 COMB levels, n being a natural number, and digital filtering said decimated digital signal a digital filter having a bandpass characteristics. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An arrangement comprising:
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a knock sensor; a signal processing device receiving and processing a signal from said knock sensor and comprising; an analog filter, a sigma-delta modulator designed for analog-digital conversion coupled to said analog filter, a CIC filter coupled to said sigma-delta modulator and designed to decimate the sampling rate having n integrator levels and n+1 COMB levels, n being a natural number, and a digital filter coupled to said CIC filter with bandpass characteristics; and an evaluation device receiving an output signal from said signal processing device. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification