Device and method for testing the plausibility of signals of a rotary encoder

Patent metadata

Field	Value
Publication number	US-10837808-B2
Application number	US-201615736029-A
Country	US
Kind code	B2
Filing date	Jun 13, 2016
Priority date	Jun 18, 2015
Publication date	Nov 17, 2020
Grant date	Nov 17, 2020

Abstract

The invention relates to a device and a method for testing the plausibility of signals of a rotary encoder. The device is formed with: a sine signal-providing device ( 11 ) designed to provide a sine signal ( 51 ) of the rotary encoder ( 12 ); a cosine signal-providing device ( 12 ) designed to provide a cosine signal ( 52 ) of the rotary encoder ( 12 ); a calculation device ( 14 ) designed to form a calculation signal ( 53 ) based on the sine signal ( 51 ) and the cosine signal ( 52 ); a maximum value-determining device ( 16 ) designed to determine a maximum value of the calculation signal ( 53 ); a minimum value-determining device ( 18 ) designed to determine a minimum value of the calculation signal ( 53 ); a determining device ( 20 ) designed to determine a differential signal ( 56 ) as or based on a value of a difference between the determined maximum value and the determined minimum value, and which differential signal indicates an amplitude difference between an amplitude of the sine signal ( 51 ) and an amplitude of the cosine signal ( 52 ); and a plausibility device ( 22 ) designed to test the plausibility of the sine signal ( 51 ) and the cosine signal ( 52 ), in the event that the differential signal ( 56 ) falls within a predetermined region.

First claim

The invention claimed is:

1. A device for testing the plausibility of signals of a rotary encoder ( 2 ), including:
a sine signal provision device ( 11 ) configured to provide a sine signal ( 51 ) of the rotary encoder ( 2 ) indicating a sine function of a time-dependent angle of rotation;
a cosine provision device ( 12 ) configured to provide a cosine signal ( 52 ) of the rotary encoder ( 2 ) indicating a cosine function of the time-dependent angle of rotation;
a computing device ( 14 ) configured to form a calculation signal ( 53 ) based on a sum of the provided sine signal ( 51 ) squared and the provided cosine signal ( 52 ) squared;
a maximum value determination device ( 16 ) configured to determine a maximum value ( 54 ) of the calculation signal ( 53 ) within a single period of the sine signal ( 51 ) and the cosine signal ( 52 );
a minimum value determination device ( 18 ) configured to determine a minimum value ( 55 ) of the calculation signal ( 53 ) within the single period of the sine signal ( 51 ) and the cosine signal ( 52 );
a determination device ( 20 ) configured to determine a difference signal ( 56 ) indicating a magnitude of a difference between the determined maximum value ( 54 ) and the determined minimum value ( 55 ); and
a plausibility testing device ( 22 ) configured to test the plausibility of the sine signal ( 51 ) and the cosine signal ( 52 ) based on if the difference signal ( 56 ) lies within a predetermined range.

2. A method for testing the plausibility of signals of a rotary encoder ( 2 ), including the steps of:
providing (S 01 ) a sine signal ( 51 ) of the rotary encoder ( 2 ) which indicates a sine function of a time-dependent angle of rotation;
providing (S 02 ) a cosine signal ( 52 ) of the rotary encoder ( 2 ) which indicates a cosine function of the time-dependent angle of rotation;
forming (S 03 ) a calculation signal ( 53 ) based on a sum of the provided sine signal ( 51 ) squared and the provided cosine signal ( 52 ) squared;
determining (S 04 ) a maximum value ( 54 ) of the calculation signal ( 53 ) within a period of the sine signal ( 51 ) and the cosine signal ( 52 );
determining (S 05 ) a minimum value ( 55 ) of the calculation signal ( 53 ) within the period of the sine signal ( 51 ) and the cosine signal ( 52 );
determining (S 06 ) a difference signal ( 56 ) which indicates a magnitude of a difference between the maximum value ( 54 ) and the minimum value ( 55 );
testing the plausibility (S 07 ) of the sine signal ( 51 ) and the cosine signal ( 52 ) based on if the difference signal ( 56 ) lies within a predetermined range; and
outputting a signal indicative of the plausibility of the sine signal ( 51 ) and the cosine signal ( 52 ).

Assignees

• Bosch Gmbh Robert

Inventors

• Lechner Benjamin
• Zirkel Daniel
• Raichle Daniel
• Ungermann Michael

Classifications

• G01B7/30

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

• G01D5/24461 Primary

  by redundancy or plausibility · CPC title

• G01D18/00 Primary

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

• G01D5/20

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