IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0532152
(2012-06-25)
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등록번호 |
US-9638548
(2017-05-02)
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발명자
/ 주소 |
- Mialtu, Razvan-Catalin
- Stoica, Dan-Ioan-Dumitru
- Untersteiner, Heinz
- Juglan, Catalina-Petruta
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
0 인용 특허 :
20 |
초록
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Embodiments relate to predictive output switching threshold determination systems and methods for sensors, for example magnetic field sensors. In embodiments, at least one individual switching threshold is determined predictively, rather than reactively, for each tooth or pole of a ferromagnetic too
Embodiments relate to predictive output switching threshold determination systems and methods for sensors, for example magnetic field sensors. In embodiments, at least one individual switching threshold is determined predictively, rather than reactively, for each tooth or pole of a ferromagnetic tooth or pole wheel, respectively. For example, in one embodiment, the number of teeth or poles is programmed, and an optimal threshold for each tooth or pole is determined during a rotation of the wheel. The determined optimal threshold for each tooth is then used for that tooth in at least one subsequent rotation of the wheel, with calibration optionally taking place in future subsequent rotations. Thus, in embodiments, thresholds are predictive for each individual tooth or pole rather than reactive to an adjacent tooth or pole.
대표청구항
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1. A sensor system comprising: a target wheel comprising a plurality of target elements; anda sensor comprising a magnetic field sensor element coupled to sensor circuitry, the magnetic field sensor element configured to sense rotation of the target wheel based on a varying magnetic field and provid
1. A sensor system comprising: a target wheel comprising a plurality of target elements; anda sensor comprising a magnetic field sensor element coupled to sensor circuitry, the magnetic field sensor element configured to sense rotation of the target wheel based on a varying magnetic field and provide a corresponding output signal comprising a maximum and a minimum for each of the plurality of target elements indicating any differences between the plurality of target elements, the sensor circuitry configured to, for each one of the plurality of target elements, use at least one maximum and at least one minimum related to the one of the plurality of target elements to predict an individual switching threshold for a subsequent instance of that one of the plurality of target elements,wherein the sensor circuitry is configured to use the maximum for the one of the plurality of target elements and a value determined from the minima for the plurality of target elements in at least one rotation to predict the individual switching threshold for at least the next instance of that one of the plurality of target elements. 2. The sensor system of claim 1, wherein the target wheel comprises one of a pole wheel or a tooth wheel and the target elements comprise one of poles or teeth, respectively. 3. The sensor system of claim 1, wherein the magnetic field sensor element comprises a Hall element. 4. The sensor system of claim 1, further comprising a back bias magnet. 5. The sensor system of claim 1, wherein the sensor circuitry is configured to, for each one of the plurality of target elements, predict a rising edge individual threshold and a falling edge individual threshold for a subsequent instance of that one of the plurality of target dements. 6. The sensor system of claim 1, wherein the sensor circuitry is further configured to, for each one of the plurality of target elements, use the maximum for the one of the plurality of target elements, a minimum immediately preceding the maximum and a minimum immediately following the maximum to predict the individual switching threshold for at least the next instance of that one of the plurality of target elements. 7. The sensor system of claim 1, wherein the sensor circuitry is further configured to, for each one of the plurality of target elements, use the minimum for the one of the plurality of target elements and an average of the maxima for the plurality of target elements in one rotation to predict the individual switching threshold for at least the next instance of that one of the plurality of target elements. 8. The sensor system of claim 1, wherein the sensor circuitry is further configured to, for each one of the plurality of target elements, use the minimum for the one of the plurality of target elements, a maximum immediately preceding the minimum and a maximum immediately following the minimum to predict the individual switching threshold for at least the next instance of that one of the plurality of target elements. 9. The sensor system of claim 1, wherein the sensor circuitry is further configured to determine a safety zone for each individual threshold, the safety zone defining a point at which the sensor circuitry can transition from comparing the output signal with a current individual threshold to comparing the output signal with a subsequent individual threshold. 10. The sensor system of claim 9, wherein the safety zone comprises a hysteresis compensation component. 11. The sensor system of claim 10, wherein the hysteresis compensation component is preprogrammed. 12. The sensor system of claim 10, wherein the hysteresis compensation component is determined by the sensor circuitry from a signal amplitude. 13. The sensor system of claim 1, wherein the sensor circuitry comprises analog signal processing circuitry, a comparator, a digital-to-analog converter and an analog-to-digital converter. 14. The sensor system of claim 13, wherein the comparator is configured to compare the output signal from the magnetic field sensor element with an individual switching threshold. 15. The sensor system of claim 1, wherein the sensor circuitry comprises, for each one of the plurality of target elements, a plurality of shift registers, a first subset of the plurality of shift registers each configured to store a maximum for one of the target elements, and a second subset of the plurality of shift registers each configured to store a minimum for one of the target elements, the plurality of shift registers configured to buffer the maxima and minima until a next instance of the target element associated with a particular set of a maximum and a minimum. 16. The sensor system of claim 1, wherein the sensor circuitry is configured to detect a total number of the plurality of target elements. 17. The sensor system of claim 1, wherein the sensor circuitry is preprogrammed with a total number of the plurality of target elements. 18. A method comprising: detecting, by a magnetic field sensor element, a maximum and a minimum for each target element, indicating any differences between each target element, during a first rotation of a target wheel;using, for each of the plurality of target elements, at least one maximum and at least one minimum related to the particular target element to predict an individual switching threshold for the particular target element in at least one subsequent rotation of the target wheel; andusing the maximum for the one of the plurality of target elements and a value determined from the minima for the plurality of target elements in at least one rotation to predict the individual switching threshold for at least the next instance of that one of the plurality of target elements. 19. The method of claim 18, comprising calibrating the individual switching threshold by repeating the detecting and using in each rotation of the target wheel. 20. The method of claim 18, further comprising using comprises using a maximum for the particular target element, a minimum immediately preceding the maximum and minimum immediately following the maximum to predict the individual switching threshold for at least the next instance of the particular target element. 21. The method of claim 18, further comprising using comprises using a minimum for the particular target element, a maximum immediately preceding the minimum and a maximum immediately following the minimum to predict the individual switching threshold for at least the next instance of the particular target element. 22. The method of claim 18, further comprising using comprises using a maximum for the particular target element and an average of the minima from at least one of the first rotation, a preceding rotation or a current rotation to predict the individual switching threshold for at least the next instance of the particular target element. 23. The method of claim 18, further comprising using comprises using a minimum for the particular target element and an average of the maxima from at least one of the first rotation, a preceding rotation or a current rotation to predict the individual switching threshold for at least the next instance of the particular target element. 24. The method of claim 18, further comprising determining a safety zone for the individual switching threshold, the safety zone defining a point to switch from an individual switching threshold for a first target element to an individual switching threshold for a next target element. 25. The method of claim 24, wherein determining a safety zone comprises including a hysteresis factor. 26. The method of claim 25, wherein including a hysteresis factor comprises using a preprogrammed hysteresis factor. 27. The method of claim 25, wherein including a hysteresis factor comprises dynamically determining a hysteresis factor from a maximum and a minimum for a target element. 28. A sensor comprising; a magnetic field sensor element configured to provide an input signal indicating differences between different portions of the input signal; andsensor circuitry coupled to the magnetic field sensor element to receive the input signal, the sensor circuitry comprising a comparator configured to, for each one of a plurality of portions of the input signal, compare the portion of the input signal with an individual switching threshold predicted for the respective portion of the input signal and to switch an output of the sensor circuitry depending upon the comparison,wherein the sensor circuitry is configured to use the maximum for the one of the plurality of portions of the input signal and a value determined from the minima for the plurality of portions of the input signal in at least one rotation to predict the individual switching threshold for at least the next instance of that one of the plurality of portions of the input signal. 29. The sensor of claim 28, wherein the magnetic field sensor element comprises a Hall effect element. 30. The sensor of claim 28, wherein the sensor circuitry comprises analog signal processing circuitry coupled between the magnetic field sensor element and the comparator. 31. The sensor system of claim 1, wherein the individual switching threshold is an optimal switching threshold for that one of the plurality of target elements, and is defined as 70% of the at least one maximum of that one of the plurality of target elements. 32. The method of claim 18, wherein the individual switching threshold is an optimal switching threshold for that target element, and is defined as 70% of the at least one maximum of that target element. 33. The sensor of claim 28, wherein the individual switching threshold is an optimal switching threshold for the portion of the input signal, and is defined as 70% of a maximum of the portion of the input signal.
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