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Patent US5332966A successfully refreshed from Google Patents.
US5332966A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of compensating for the temperature of inductive sensors
Assignee: Mannesmann VDO AG
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Filing: 1992-10-13
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Granted: 1994-07-26
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Expires: 2012-10-13
Abstract
Abstract In a method and with a circuit for compensating for the temperature of inductive sensors having at least one coil from the inductance of which an output variable is formed as measure for a physical variable to be measured, a variable which is dependent on the resistance of the coil is measured and used for correction upon the forming of the output variable.
Inventors
- 👤 Reinhold Berberich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:08
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/12; G01D5/14; G01D5/20; G01R; G01R27/00; G01R27/02; G01R27/26; G01R27/2611
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
234 words
A method of compensating for the temperature of an inductive sensor comprising a coil, the inductance of the coil serving to form an output variable which serves as a measurement for a physical variable which is to be measured, the method comprising connecting a resistor in series with the coil to form a series circuit of the resistor and the coil; applying a first pulse of reference voltage to the series circuit, a resultant voltage drop across the coil being characterized by an internal overshoot pulse followed by a decay to a steady value, the overshoot pulse having a width less than a width of the first pulse; measuring the width of the overshoot pulse, the width of the overshoot pulse being dependent on a resistance of the coil and a rate of reduction of the coil voltage drop during decay of the overshoot pulse to the steady state value of the coil voltage drop; measuring the steady state value of voltage; providing a set of correction values for the output variable, the set of correction values being addressable by an address having the steady state value of the coil voltage drop as a first component of the address and the width of the overshoot pulse as a second component of the address; and reading a correction value corresponding to an address of the set of correction values for correction of the output variable.
Claim 2
Independent Claim
234 words
A method of compensating for the temperature of an inductive sensor comprising a coil, the inductance of the coil serving to form an output variable which serves as a measurement for a physical variable which is to be measured, the method comprising connecting a resistor in series with the coil to form a series circuit of the resistor and the coil; applying a first pulse of reference voltage to the series circuit, a resultant voltage drop across the coil being characterized by an internal overshoot pulse followed by a decay to a steady value, the overshoot pulse having a width less than a width of the first pulse; measuring the width of the overshoot pulse, the width of the overshoot pulse being dependent on a resistance of the coil and a rate of reduction of the coil voltage drop during decay of the overshoot pulse to the steady state value of the coil voltage drop; measuring the steady state value of voltage; providing a set of correction values for the output variable, the set of correction values being addressable by an address having the steady state value of the coil voltage drop as a first component of the address and the width of the overshoot pulse as a second component of the address; and reading a correction value corresponding to an address of the set of correction values for correction of the output variable.
Claim 3
Dependent Claim
40 words
A method according to claim 1, wherein a correction value for the output variable is obtained from a stored data set of the correction values, the correction value being an amount of inductance based on the temperature of the coil.
Claim 4
Dependent Claim
75 words
A method according to claim 1, further comprising: connecting an input from the coil to an analog-signal input of a microcontroller, and to a first input of a comparator and, via the resistor and a controllable switch, to a source of the reference voltage; connecting a second input of the comparator via a voltage divider to the source of reference voltage; and connecting an output of the comparator to an interrupt input of the microcontroller.
Claim 5
Dependent Claim
20 words
A method according to claim 3, further comprising connecting the input of the coil to ground potential via a diode.
Claim 6
Dependent Claim
13 words
A method according to claim 4, wherein the diode is a zener diode.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-07-25 | 1998-01-24 | 1998-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-07-25 | 2002-01-24 | 2002-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-07-25 | 2006-01-24 | 2006-07-26 | $7700.00 | Window Closed / Lapsed |