Method and Device for Monitoring Signal Levels

• US 20140172124A1
• Filed: 12/13/2013
• Published: 06/19/2014
• Est. Priority Date: 12/18/2012
• Status: Abandoned Application

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Kern, Robert, Kiefer, Tobias
• Application Number:
  US14/105,464
• Publication Number:
  US 20140172124A1
• Time in Patent Office: Days
• US Class Current: 700/19
• CPC Class Codes: G01D 3/08 with provision for safeguarding the apparatus, e.g. against abnormal operation, against breakdown
• CPC Class Codes: G01R 33/07 Hall effect devices

Abstract

A method for monitoring the signal levels of signals that are generated, for the purpose of detecting a magnetic field, by a plurality of Hall sensors, includes determining an average value of the signal levels. The method further includes comparing a progression of the average value with an expected progression of the average value. The expected progression includes a characteristic temporal sequence of a first value and at least a second value that differs from the first value. An error message is provided if the average value deviates from the expected progression by more than a tolerance range.

Claims

1. A method for monitoring signal levels of signals that are generated, for the purpose of detecting a magnetic field, by a plurality of Hall sensors, comprising:

determining an average value of the signal levels; and

comparing a progression of the average value with an expected progression of the average value,

wherein the expected progression includes a characteristic temporal sequence of a first value and at least a second value that differs from the first value, and

wherein an error message is provided if the average value deviates from the expected progression by more than a tolerance range.

2. The method according to claim 1, wherein the error message is provided in the comparing step if the average value dwells longer than a predetermined transition time outside a first tolerance range around the first value or outside a second tolerance range around the second value.

3. The method according to claim 2, wherein:

the error message is provided in the comparing step if the average value dwells longer than the transition time outside the first tolerance range or outside the second tolerance range or at least outside an additional tolerance range, and

the additional tolerance range is arranged adjacent to the first tolerance range and/or the second tolerance range.

4. The method according to claim 3, wherein:

the error message includes additional information in the comparing step, and

the additional information indicates from which tolerance range the average value deviates and/or whether the average value subsequently dwells at a rising signal edge or subsequently dwells at a falling signal edge.

5. The method according to claim 1, wherein:

position information regarding the magnetic field that is monitored by the Hall sensors is obtained in the comparing step from the average value, and

the position information is determined from a correlation between an actual signal level of the average value and an angular position of the magnetic field.

6. The method according to claim 1, wherein the average value is determined in the determining step from a first signal level, a second signal level, and a third signal level.

7. The method according to claim 6, wherein the average value is moreover determined in the determining step from at least an additional signal level.

8. A device for monitoring signal levels of signals that are generated, for the purpose of detecting a magnetic field, by a plurality of Hall sensors, comprising:

a first device unit configured to determine an average value of the signal levels; and

a second device unit configured to compare a progression of the average value with an expected progression of the average value,

wherein the expected progression comprises a characteristic temporal sequence of a first value and at least a second value that differs from the first value, and

wherein the second device unit is further configured to provide an error message if the average value deviates from the expected progression by more than a tolerance range.

9. A computer program product comprising:

a program code configured to perform a method for monitoring signal levels of signals that are generated, for the purpose of detecting a magnetic field, by a plurality of Hall sensors, if the program product is implemented on a device, the method including

determining an average value of the signal levels, and

comparing a progression of the average value with an expected progression of the average value,

wherein the expected progression includes a characteristic temporal sequence of a first value and at least a second value that differs from the first value, and

wherein an error message is provided if the average value deviates from the expected progression by more than a tolerance range.