# US 8,751,190 B2 · Method for ascertaining a rotational direction of a rotating body, and wheel sensor module > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,751,190 B2 - Document ID: US8751190B2 - Status: Granted - Kind: B2 - Application number: 12/924,574 - Filed: 2010-09-29 - Published: 2011-04-07 - Granted: 2014-06-10 - Earliest claimed: 2009-10-02 - Assignees: Robert Bosch GmbH - Applicants: Dominik Geisler; Axel Wenzler; Markus Brockmann - Inventors: Dominik Geisler; Axel Wenzler; Markus Brockmann - Web page: https://patentgrep.com/patent/US8751190B2 ## CPC - G01P 3/22: transferred to the indicator by electric or magnetic means - B60C 23/0416: {allocating a corresponding wheel position on vehicle, e.g. front/left or rear/right} - G01P 13/04: Indicating positive or negative direction of a linear movement or clockwise or anti-clockwise direction of a rotational movement - G01P: MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT (measuring or recording blood flow A61B5/02, A61B8/06; monitoring speed or deceleration of electrically-propelled vehicles B60L3/00; vehicle lighting systems adapted to indicate speed B60Q1/54; determining position or course in navigation, measuring ground distance in geodesy or surveying G01C; combined measuring devices for measuring two or more variables of movement G01C23/00; measuring velocity of sound G01H; measuring velocity of light G01J7/00; measuring direction or velocity of solid objects by reception or emission of radiowaves or other waves and based on propagation effects, e.g. Doppler effect, propagation time, direction of propagation, G01S; measuring speed of nuclear radiation G01T; measuring acceleration of gravity G01V; {measuring or recording the speed of trains B61L23/00; speed indicators incorporated in motor vehicles B60K35/00; measuring frequency or phase G01R; traffic control G08G}) - B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES ## Abstract In a method for ascertaining a rotational direction of a rotating body, one rotational direction and one rotational speed value which indicates the rotational frequency of the rotating body are ascertained in each of multiple measurements. The rotational speed values of the multiple measurements are compared to each other, and a rotational direction of the rotating body is ascertained from the measured rotational directions and the comparison of the rotational speed values. ## Claims ### Claim 1 A method for ascertaining a rotational direction of a rotating body, comprising: measuring, by a processor, in each of multiple measurements, one rotational direction and one rotational speed value indicating the rotational frequency of the rotating body; comparing, by the processor, the rotational speed values of the multiple measurements to each other; and ascertaining, by the processor, the rotational direction of the rotating body based on the measured rotational directions and the comparison of the rotational speed values; wherein in each of the measurements, at least two acceleration sensors each measure a gravitational acceleration with a phase shift, and the rotational speed value and the rotational direction as ascertained from the values measured by the two acceleration sensors; wherein for multiple measurements recorded within a specified time period, intervals of the rotational speed values relative to each other are evaluated, and the rotational direction of the rotating body is ascertained based on the evaluation; and wherein in the evaluation of the intervals of the rotational speed values relative to each other, a most significant rotational speed value is ascertained, and the rotational direction assigned to the most significant rotational speed value is determined as the rotational direction of the rotating body. ### Claim 2 (depends on 1) The method as recited in claim 1, further comprising: comparing the measured rotational directions to each other; and ascertaining an overall rotational speed value of the rotating body based on the comparison of the rotational speed values of the multiple measurements. ### Claim 3 (depends on 1) The method as recited in claim 1, wherein the ascertainment of the most significant rotational speed value is carried out using a rating function which assigns rating values to the intervals. ### Claim 4 (depends on 3) The method as recited in claim 3, wherein the rating function assigns rating values to each of the intervals of the rotational speed values, and for each ascertained rotational speed value a sum of the rating values of the intervals is formed, and based on the sum the most significant rotational speed value is ascertained. ### Claim 5 (depends on 4) The method as recited in claim 4, wherein the rating values are allocated to the intervals as a function of the size of the intervals. ### Claim 6 (depends on 4) The method as recited in claim 4, wherein a frequency range within which the rotational speed values of the ascertained measurements lie is subdivided into discretized rotational speed values, and the discretized rotational speed values are assessed as a function of distance from the ascertained rotational speed values of the measurements. ### Claim 7 (depends on 1) The method as recited in claim 1, wherein, for a first set of measurements, a centrifugal acceleration is ascertained from the values measured by the two acceleration sensors, and wherein a relationship between the ascertained centrifugal acceleration and rotational speed values is ascertained from the first set of measurements, and wherein subsequent measurements are compared to the ascertained relationship to determine whether the subsequent measurements are erroneous. ### Claim 8 A method for ascertaining a rotational direction of a rotating body, comprising: measuring, by a processor, in each of multiple measurements, one rotational direction and one rotational speed value indicating the rotational frequency of the rotating body; comparing, by the processor, the rotational speed values of the multiple measurements to each other; and ascertaining, by the processor, the rotational direction of the rotating body based on the measured rotational directions and the comparison of the rotational speed values; wherein in each of the measurements, at least two acceleration sensors each measure a gravitational acceleration with a phase shift, and the rotational speed value and the rotational direction are ascertained from the values measured by the two acceleration sensors; wherein, for a first set of measurements, a centrifugal acceleration is ascertained from the values measured by the two acceleration sensors, and wherein a relationship between the ascertained centrifugal acceleration and rotational speed values is ascertained from the first set of measurements, and wherein subsequent measurements are compared to the ascertained relationship to determine whether the subsequent measurements are erroneous; and wherein a proportionality factor is ascertained from the centrifugal acceleration and rotational speed values of the first set of measurements, and wherein the proportionality factor is used to determine whether the subsequent measurements are erroneous. ### Claim 9 (depends on 8) The method as recited in claim 8, further comprising: comparing the measured rotational directions to each other; and ascertaining an overall rotational speed value of the rotating body based on the comparison of the rotational speed values of the multiple measurements. ### Claim 10 (depends on 8) The method as recited in claim 8, wherein, for a first set of measurements, a centrifugal acceleration is ascertained from the values measured by the two acceleration sensors, and wherein a relationship between the ascertained centrifugal acceleration and rotational speed values is ascertained from the first set of measurements, and wherein subsequent measurements are compared to the ascertained relationship to determine whether the subsequent measurements are erroneous. ### Claim 11 A non-transitory computer-readable storage medium storing a computer program having codes which, when executed on a computer, perform a method for ascertaining a rotational direction of a rotating body, the method comprising: measuring, in each of multiple measurements, one rotational direction and one rotational speed value indicating the rotational frequency of the rotating body; comparing the rotational speed values of the multiple measurements to each other; and ascertaining the rotational direction of the rotating body based on the measured rotational directions and the comparison of the rotational speed values; wherein in each of the measurements, at least two acceleration sensors each measure a gravitational acceleration with a phase shift, and the rotational speed value and the rotational direction as ascertained from the values measured by the two acceleration sensors; wherein for multiple measurements recorded within a specified time period, intervals of the rotational speed values relative to each other are evaluated, and the rotational direction of the rotating body is ascertained based on the evaluation; and wherein in the evaluation of the intervals of the rotational speed values relative to each other, a most significant rotational speed value is ascertained, and the rotational direction assigned to the most significant rotational speed value is determined as the rotational direction of the rotating body.