Sensor arrangement with measurement error detection
First Claim
1. A sensor arrangement comprising two sensors supplying respective sensor signals, and a processing unit having two A/D converter units at an input side of the processing unit, for deriving a measurement signal from the respective sensor signals,characterized in that the sensor arrangement further comprises switching means arranged between said sensors and said A/D converter units, for switching between first and second switching states in such manner that in each switching state a sensor signal is applied to each of the A/D converter units and that the allocation of the sensor signals to the A/D converter units is different in the two switching states, and said processing unit derives a first measurement signal during the first switching state, and a second measurement signal during the second switching state, and derives an error signal from said first and second measurement signals.
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Abstract
A sensor arrangement comprising two sensors (1, 2) and processing unit (16) for deriving a measurement signal (M1, M2) from two sensor signals (S1, S2) which are each supplied by one sensor (1, 2). Such a sensor arrangement may comprise for example two angular-position sensors which measure the angular position of a measurement object with respect to the sensor arrangement. According to the invention, in order to enable detection of errors occurring in such a sensor arrangement, particularly at the input of the processing unit (16) during the conversion of the sensor signals in the A/D converter units (3, 4), switching means (11, 12) have been provided for switching to two switching states in such manner that in each switching state a sensor signal (S1, S2) is applied to each of the A/D converter units (3, 4) and that the allocation of the sensor signals (S1, S2) to the A/D converter units (3, 4) is different in the two switching states, and the processing unit (16) is constructed to derive an error signal (F) from two measurement signals (M1, M2) determined during each time one switching state.
16 Citations
9 Claims
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1. A sensor arrangement comprising two sensors supplying respective sensor signals, and a processing unit having two A/D converter units at an input side of the processing unit, for deriving a measurement signal from the respective sensor signals,
characterized in that the sensor arrangement further comprises switching means arranged between said sensors and said A/D converter units, for switching between first and second switching states in such manner that in each switching state a sensor signal is applied to each of the A/D converter units and that the allocation of the sensor signals to the A/D converter units is different in the two switching states, and said processing unit derives a first measurement signal during the first switching state, and a second measurement signal during the second switching state, and derives an error signal from said first and second measurement signals.
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7. An angular-position sensor arrangement comprising two angular-position sensors which are angularly spaced from one another, supplying respective sensor signals, and a processing unit having two A/D converter units at an input side of the processing unit, for deriving a measurement signal from the respective sensor signals,
characterized in that the sensor arrangement further comprises switching means arranged between said angular-position sensors and said A/D converter units, for switching between first and second switching states in such manner that in each switching state a sensor signal is applied to each of the A/D converter units and that the allocation of the sensor signals to the A/D converter units is different in the two switching states, and said processing unit derives a first measurement signal during the first switching state, and a second measurement signal during the second switching state and derives an error signal from said first and second measurement signals.
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9. A method of measurement-error detection in a sensor arrangement in which a measurement signal (M1, M2) is derived from two sensor signals (S1, S2) by means of a processing unit (16) comprising two A/D converter units (3, 4), characterized in that the two sensor signals (S1, S2) are converted by means of one A/D converter (3, 4), a first measurement signal (M1) is derived from the output signals of said A/D converter units, the two sensor signals (S1, S2) are converted by means of the other A/D converter unit (4, 3), a second measurement signal (M2) is derived from their output signals, and an error signal (F) is derived from the two measurement signals (M1, M2).
Specification