Back to results
US 5,332,966 AGranted
Method of compensating for the temperature of inductive sensors
AssigneeVDO Adolf Schindling AG
InventorReinhold Berberich
Life of this patent
Estimating the term…
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.
Claims5
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.
4 more elements
Dependencies are inferred from the claim text.