Apparatus and method for calculating offset value for an electric sensor
First Claim
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1. An apparatus for calculating an offset value for a current sensor of a magnetic flux detection type, comprising:
- a determining device which determines whether calculation of the offset value is permitted based on a current value detected by the current sensor, the determining device making the determination such that calculation of the offset value is permitted when the current value detected by the current sensor is switched from a negative value to a positive value, or from a positive value to a negative value; and
a calculating device which calculates the current value detected by the current sensor as the offset value when calculation of the offset value is permitted by the determining device.
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Abstract
Calculation of an offset value is permitted when a current value detected by an ammeter of a magnetic flux detection type is switched from a negative value to a positive value, or from a positive value to a negative value, and also a state where an absolute value of the current value is with in a predetermined range is continued for a predetermined time. When calculation of the offset value is permitted, the fact that an ignition switch is turned OFF is detected, and the current value detected by the ammeter is calculated as the offset value.
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Citations
14 Claims
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1. An apparatus for calculating an offset value for a current sensor of a magnetic flux detection type, comprising:
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a determining device which determines whether calculation of the offset value is permitted based on a current value detected by the current sensor, the determining device making the determination such that calculation of the offset value is permitted when the current value detected by the current sensor is switched from a negative value to a positive value, or from a positive value to a negative value; and
a calculating device which calculates the current value detected by the current sensor as the offset value when calculation of the offset value is permitted by the determining device. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for calculating an offset value for a current sensor of a magnetic flux detection type, comprising:
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a determination step in which a determination is made such that calculation of the offset value is permitted when a current value detected by the current sensor is switched from a negative value to a positive value, or from a positive value to a negative value; and
a calculation step in which the current value detected by the current sensor is calculated as the offset value when calculation of the offset value is permitted in the determination step. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification