초록 ▼

This invention discloses an apparatus and method of determining the temperature of the core of an inductive coil sensor so that the effective inductance of the coil sensor can be temperature compensated to thereby provide an accurate measure of the level of fuel in a tank. The method comprises energ

This invention discloses an apparatus and method of determining the temperature of the core of an inductive coil sensor so that the effective inductance of the coil sensor can be temperature compensated to thereby provide an accurate measure of the level of fuel in a tank. The method comprises energizing the sensor with a prescribed voltage, de-energizing the sensor, measuring the resultant voltage across the sensor, and determining the core temperature from the measured resultant voltage across the sensor.

대표청구항 ▼

This invention discloses an apparatus and method of determining the temperature of the core of an inductive coil sensor so that the effective inductance of the coil sensor can be temperature compensated to thereby provide an accurate measure of the level of fuel in a tank. The method comprises energ

This invention discloses an apparatus and method of determining the temperature of the core of an inductive coil sensor so that the effective inductance of the coil sensor can be temperature compensated to thereby provide an accurate measure of the level of fuel in a tank. The method comprises energizing the sensor with a prescribed voltage, de-energizing the sensor, measuring the resultant voltage across the sensor, and determining the core temperature from the measured resultant voltage across the sensor. ge dividing resistor and the second voltage dividing resistor which are interposed on the first current line, and a detection circuit detecting leakage occurrence based on outputs of the first and the second comparators. 4. A leakage detection circuit for use in a power source device according to claim 3 wherein the first and the second comparators each outputs two signals different in potential corresponding to magnitude relation between a voltage impressed to one input end and a reference voltage impressed to the other input end. 5. A leakage detection circuit for use in a power source device according to claim 3 wherein the circuit comprises a photocoupler which is connected to an output end of the first comparator and to an output end of the second comparator, and which comprises a light-emitting diode for emitting light corresponding to potentials of the output ends and a phototransistor to be turned on by light-emitting of the light-emitting diode, and the circuit detects leakage occurrence based on on/off of the phototransistor. 6. A leakage detection circuit for use in a power source device according to claim 3 wherein a dead zone in detecting leakage is generated when a voltage to be impressed to one input end of the first comparator is greater than a reference voltage to be impressed to the other input end, and when a voltage to be impressed to one input end of the second comparator is smaller than a reference voltage to be impressed to the other input end. 7. A leakage detection circuit for use in a power source device according to claim 3 wherein in the event of the leakage occurrence at any point of connection between the plurality of cells constituting the cell unit, the dead zone in detecting leakage based on the outputs of the first and the second comparators is contained in an inside of a potential distribution region corresponding to one cell, which is included in potential distribution generated between the opposite electrodes of the cell unit. 8. A leakage detection circuit for use in a power source device according to claim 7 wherein values of resistance for the first and the second voltage dividing resistors which are interposed on the first current line, for the first and the second protection resistors, and for the first and the second detection resistors which are interposed on the second current line are so adjusted as to serve as a circuit constant of the first and the second current line.