Apparatuses and methods for evaluating a signal emitted by a rotational angle sensor

Patent metadata

Field	Value
Publication number	US-11079263-B2
Application number	US-201615736036-A
Country	US
Kind code	B2
Filing date	Jun 13, 2016
Priority date	Jun 18, 2015
Publication date	Aug 3, 2021
Grant date	Aug 3, 2021

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.

First claim

The invention claimed is:

1. 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.

2. The apparatus as claimed in claim 1 , wherein the first processing unit ( 10 ) comprises a first sampling device, configured to sample the first filtered signal with a first sampling frequency;
and the second processing unit ( 20 ) comprises a second sampling device, configured to sample the second filtered signal with a second sampling frequency;
and wherein the first calculation unit ( 12 ) calculates the first angle value on the basis of the sampled first filtered signal and in the second calculation unit ( 22 ) calculates the second angle value on the basis of the sampled second filtered signal.

3. The apparatus as claimed in claim 2 , wherein the first sampling frequency is greater than the second sampling frequency.

4. The apparatus as claimed in claim 2 , wherein the first sampling device comprises a delta-sigma analog-to-digital converter (DS-ADC).

5. The apparatus as claimed in claim 2 , wherein the second sampling device comprises a successive approximation register analog-to-digital converter (SAR-ADC).

6. The apparatus as claimed in claim 1 , wherein the first calculation unit ( 12 ) processes the signal of the rotational angle sensor ( 2 ) on the basis of a voltage difference between a first signal lines and a second signal line; and
the second processing unit ( 22 ) processes the signal of the rotational angle sensor ( 2 ) on the basis of a first voltage between the first signal line and a reference potential and a second voltage between the second signal line and the reference potential.

7. A drive system, having:
an electric motor ( 3 ), configured to drive a drive shaft;
a rotational angle sensor ( 2 ), coupled to the drive shaft of the electric motor ( 3 ) and configured to deliver an electrical signal which corresponds to the relative position of the drive shaft;
an apparatus for evaluating a signal of a rotational angle sensor ( 2 ) as claimed in claim 1 .

8. The drive system as claimed in claim 7 , wherein the rotational angle sensor ( 2 ) comprises a resolver.

9. A method for evaluating a signal of a rotational angle sensor ( 2 ), having the steps:
receiving (S 1 ), separately at both a first processing unit and a second processing unit, a measurement signal from the rotational angle sensor ( 2 );
applying (S 2 ), 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 (S 3 ) a first angle value on the basis of the first filtered signal;
applying (S 4 ), 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 (S 5 ) a second angle value on the basis of the second filtered signal;
comparing (S 6 ) 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.

10. The method as claimed in claim 9 , wherein the step (S 1 ) of receiving a signal of the rotational angle sensor ( 2 ) includes receiving two mutually phase-shifted signals from a resolver.

Assignees

• Bosch Gmbh Robert

Inventors

• Zirkel Daniel
• Ungermann Michael
• Lechner Benjamin
• Raichle Daniel
• Eberlein Edwin
• Bruckhaus Tim

Classifications

• G01B7/30

  for measuring angles or tapers; for testing the alignment of axes · CPC title

• H02K24/00

  Machines adapted for the instantaneous transmission or reception of the angular displacement of rotating parts, e.g. synchro, selsyn · CPC title

• G01D5/20

  by varying inductance, e.g. by a movable armature · CPC title

• G01D5/24457 Primary

  Failure detection · CPC title

• G01D18/00 Primary

  Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00 · CPC title