US5497084A
Expired / Lapsed
US
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Geartooth sensor with means for selecting a threshold magnitude as a function of the average and minimum values of a signal of magnetic field strength
Assignee: Honeywell Inc
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Filing: 1995-03-03
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Granted: 1996-03-05
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Expires: 2015-03-03
Abstract
Abstract A geartooth sensor is provided with a circuit which determined a threshold magnitude as a function of the minimum value of a first output signal from a magnetically sensitive component and an average output signal from a magnetic sensitive component. Circuitry is provided to determine the average signal. The minimum signal is then subtracted from the average signal and the resulting signal is doubled before being scaled by a predetermined fraction and then compared to the original output signal from the magnetically sensitive component. This circuit therefore determines a threshold signal as a function of both the minimum signal value and the average signal value and, in addition, enables the resulting signal to be scaled to a predetermined percentage of this difference for the purpose of selecting a threshold value that is most particularly suitable for a given application.
Inventors
- 👤 Robert E. Bicking
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:38
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/12; G01D5/244; G01D5/24471; G01D5/2448; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/48; G01P3/481; G01P3/488; H; H03; H03K; H03K5/00; H03K5/01; H03K5/08; H03K5/082; H03K5/084
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
171 words
A magnetic sensor, comprising: a permanent magnet; a magnetically sensitive component disposed proximate said magnet; first means, connected to said magnetically sensitive component, for providing a first output signal which is representative of the presence of a ferromagnetic member within a detection zone of said sensor; second means, connected to said first providing means, for providing a second output signal which is representative of an average value of said first output signal over a first preselected period of time; third means, connected to said first providing means, for providing a third output signal which is representative of a minimum value of said first output signal over a second period of time; fourth means, connected to said second and third providing means, for providing a fourth output signal which is a function of the difference between said second and third output signals; and fifth means, connected to said first and fourth providing means, for providing a fifth output signal which is representative of the difference between said first and fourth output signals.
Claim 2
Dependent Claim
171 words
A magnetic sensor, comprising: a permanent magnet; a magnetically sensitive component disposed proximate said magnet; first means, connected to said magnetically sensitive component, for providing a first output signal which is representative of the presence of a ferromagnetic member within a detection zone of said sensor; second means, connected to said first providing means, for providing a second output signal which is representative of an average value of said first output signal over a first preselected period of time; third means, connected to said first providing means, for providing a third output signal which is representative of a minimum value of said first output signal over a second period of time; fourth means, connected to said second and third providing means, for providing a fourth output signal which is a function of the difference between said second and third output signals; and fifth means, connected to said first and fourth providing means, for providing a fifth output signal which is representative of the difference between said first and fourth output signals.
Claim 3
Dependent Claim
19 words
The sensor of claim 1, wherein: said first and second periods of time are generally equal to each other.
Claim 4
Dependent Claim
23 words
The sensor of claim 1, wherein: said fourth providing means comprises means for doubling the difference between said second and third output signals.
Claim 5
Dependent Claim
31 words
The sensor of claim 1, wherein: said fourth output signal is generally equal to two times the difference between the average value of said first output signal said third output signal.
Claim 6
Dependent Claim
12 words
The sensor of claim 1, wherein: said sensor is a geartooth sensor.
Claim 7
Dependent Claim
37 words
The sensor of claim 5, further comprising: a gear having a plurality of teeth, said gear being rotatable about an axis of rotation, said plurality of teeth being movable through a detection zone of said geartooth sensor.
Claim 8
Dependent Claim
23 words
The sensor of claim 1, wherein: the mathematical relationship of the fifth output signal to the first and fourth output signals is variable.
Claim 9
Dependent Claim
187 words
A magnetic sensor, comprising: a permanent magnet; a magnetically sensitive component disposed proximate said magnet; first means, connected to said magnetically sensitive component, for providing a first output signal which is representative of the presence of a ferromagnetic member within a detection zone of said sensor; second means, connected to said first providing means, for providing a second output signal which is representative of an average value of said first output signal over a first preselected period of time; third means, connected to said first providing means, for providing a third output signal which is representative of a minimum value of said first output signal over a second period of time; fourth means, connected to said second and third providing means, for providing a fourth output signal which is a function of the difference between said second and third output signals; and fifth means, connected to said first and fourth providing means, for providing a fifth output signal which is representative of the difference between said first and fourth output signals, said second providing means comprising means for amplifying said average value of said second output signal.
Claim 10
Dependent Claim
187 words
A magnetic sensor, comprising: a permanent magnet; a magnetically sensitive component disposed proximate said magnet; first means, connected to said magnetically sensitive component, for providing a first output signal which is representative of the presence of a ferromagnetic member within a detection zone of said sensor; second means, connected to said first providing means, for providing a second output signal which is representative of an average value of said first output signal over a first preselected period of time; third means, connected to said first providing means, for providing a third output signal which is representative of a minimum value of said first output signal over a second period of time; fourth means, connected to said second and third providing means, for providing a fourth output signal which is a function of the difference between said second and third output signals; and fifth means, connected to said first and fourth providing means, for providing a fifth output signal which is representative of the difference between said first and fourth output signals, said second providing means comprising means for amplifying said average value of said second output signal.
Claim 11
Dependent Claim
19 words
The sensor of claim 8, wherein: said first and second periods of time are generally equal to each other.
Claim 12
Dependent Claim
31 words
The sensor of claim 8, wherein: said fourth output signal is generally equal to two times the difference between the average value of said first output signal said third output signal.
Claim 13
Dependent Claim
12 words
The sensor of claim 8, wherein: said sensor is a geartooth sensor.
Claim 14
Dependent Claim
37 words
The sensor of claim 11, further comprising: a gear having a plurality of teeth, said gear being rotatable about an axis of rotation, said plurality of teeth being movable through a detection zone of said geartooth sensor.
Claim 15
Dependent Claim
23 words
The sensor of claim 8, wherein: the mathematical relationship of the fifth output signal to the first and fourth output signals is variable.
Claim 16
Dependent Claim
197 words
A magnetic sensor, comprising: a permanent magnet; a magnetically sensitive component disposed proximate said magnet; first means, connected to said magnetically sensitive component, for providing a first output signal which is representative of the presence of a ferromagnetic member within a detection zone of said sensor; second means, connected to said first providing means, for providing a second output signal which is representative of an average value of said first output signal over a first preselected period of time; third means, connected to said first providing means, for providing a third output signal which is representative of a minimum value of said first output signal over a second period of time; fourth means, connected to said second and third providing means, for providing a fourth output signal which is a function of the difference between said second and third output signals; and fifth means, connected to said first and fourth providing means, for providing a fifth output signal which is representative of the difference between said first and fourth output signals, said fourth output signal being generally equal to two times the difference between the average value of said first output signal and said third output signal.
Claim 17
Dependent Claim
197 words
A magnetic sensor, comprising: a permanent magnet; a magnetically sensitive component disposed proximate said magnet; first means, connected to said magnetically sensitive component, for providing a first output signal which is representative of the presence of a ferromagnetic member within a detection zone of said sensor; second means, connected to said first providing means, for providing a second output signal which is representative of an average value of said first output signal over a first preselected period of time; third means, connected to said first providing means, for providing a third output signal which is representative of a minimum value of said first output signal over a second period of time; fourth means, connected to said second and third providing means, for providing a fourth output signal which is a function of the difference between said second and third output signals; and fifth means, connected to said first and fourth providing means, for providing a fifth output signal which is representative of the difference between said first and fourth output signals, said fourth output signal being generally equal to two times the difference between the average value of said first output signal and said third output signal.
Claim 18
Dependent Claim
19 words
The sensor of claim 14, wherein: said first and second periods of time are generally equal to each other.
Claim 19
Dependent Claim
12 words
The sensor of claim 14, wherein: said sensor is a geartooth sensor.
Claim 20
Dependent Claim
37 words
The sensor of claim 16, further comprising: a gear having a plurality of teeth, said gear being rotatable about an axis of rotation, said plurality of teeth being movable through a detection zone of said geartooth sensor.
Claim 21
Dependent Claim
23 words
The sensor of claim 14, wherein: the mathematical relationship of the fifth output signal to the first and fourth output signals is variable.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-03-05 | 1999-09-04 | 2000-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-03-05 | 2003-09-04 | 2004-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-03-05 | 2007-09-04 | 2008-03-05 | $7700.00 | Window Closed / Lapsed |