Apparatuses and methods for evaluating a signal emitted by a rotational angle sensor
AssigneeRobert Bosch GmbH
InventorsDaniel Zirkel, Michael Ungermann, Benjamin Lechner, Daniel Raichle, Edwin Eberlein, Tim Bruckhaus
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Abstract
The present invention relates to a double analysis of signals emitted by a rotational angle sensor. For this purpose, the signal emitted by the rotational angle sensor is processed in a first signal path with respect to a maximum angle quality of the angle signal to be calculated. A second signal path for processing the signal emitted by the rotational angle sensor is optimized to indicate a maximum diagnosability of errors.
Claims10
An apparatus for evaluating a signal of a rotational angle sensor (2), the apparatus configured to:
- receive, separately at a first processing unit (10) and at a second processing unit (20), a measurement signal from the rotational angle sensor (2);
- apply, via the first processing unit (10), a bandpass filter (11) to attenuate frequency components below and above a predetermined frequency range and to suppress a DC component of the signal from the rotational angle sensor (2) received at the first processing unit (10), producing a first filtered signal;
- apply, via the second processing unit (20), a lowpass and bandpass filter (21) to attenuate frequency components of the signal from the rotational angle sensor (2) received at the second processing unit (20) above a predetermined cutoff frequency, producing a second filtered signal;
- calculate a first angle value, via a first calculation unit (12), based on the first filtered signal;
- calculate a second angle value, via a second calculation unit (22), based on the second filtered signal;
- compare, via an analysis device (30) the calculated first angle value with the calculated second angle value;
- and
- determine an error in a processing of the angle signals in response to detecting a discrepancy between the first angle value and the second angle value.
A method for evaluating a signal of a rotational angle sensor (2), having the steps:
- receiving (S1), separately at both a first processing unit and a second processing unit, a measurement signal from the rotational angle sensor (2);
- applying (S2), via the first processing unit, bandpass filtering to the received measurement signal of the rotational angle sensor in order to obtain a first filtered signal, frequency components below and above a predetermined frequency range being attenuated and a DC component of the received signal being suppressed;
- calculating (S3) a first angle value on the basis of the first filtered signal;
- applying (S4), via the second processing unit, combined lowpass and bandpass filtering to the received signal of the rotational angle sensor in order to obtain a second filtered signal, frequency components above a predetermined cutoff frequency being attenuated;
- calculating (S5) a second angle value on the basis of the second filtered signal;
- comparing (S6) the calculated first angle value with the calculated second angle value;
- and
- determining an error in a processing of the angle signals in response to detecting a discrepancy between the first angle value and the second angle value to detect an error.
Dependencies are inferred from the claim text.