SENSOR DIAGNOSTIC APPARATUS AND METHOD THEREOF
First Claim
1. A sensor diagnostic apparatus for diagnosing a sensor among a plurality of sensors, each of said plurality of sensors identifying an object and outputting acquired identification data, said sensor diagnostic apparatus comprising:
- a moving object counter for counting, in accordance with identification data acquired by the plurality of sensors in a predefined time period, a local number of moving objects moving between a sensing area of a first sensor and a sensing area of a second sensor near the first sensor;
a reference value storage for storing a preset reference value for the first sensor and the second sensor; and
a comparator for comparing a value derived from the local number of moving objects counted by the moving object counter with the preset reference value stored in the reference value storage to determine the first sensor to be in trouble when a difference between the value derived from the local number of moving objects and the preset reference value exceeds a predefined threshold value.
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Accused Products
Abstract
A sensor diagnostic apparatus for diagnosing a sensor includes a moving object counter, a reference value storage, and a comparator. The moving object counter counts, in accordance with identification data acquired by a plurality of sensors in a predefined time period, a local number of moving objects moving between a sensing area of a first sensor and a sensing area of a second sensor near the first sensor. The reference value storage stores a preset reference value for the first sensor and the second sensor. The comparator compares a value derived from the local number of moving objects counted by the moving object counter with the preset reference value stored in the reference value storage to determine the first sensor to be in trouble when a difference between the value derived from the local number of moving objects and the preset reference value exceeds a predefined threshold value.
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Citations
12 Claims
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1. A sensor diagnostic apparatus for diagnosing a sensor among a plurality of sensors, each of said plurality of sensors identifying an object and outputting acquired identification data, said sensor diagnostic apparatus comprising:
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a moving object counter for counting, in accordance with identification data acquired by the plurality of sensors in a predefined time period, a local number of moving objects moving between a sensing area of a first sensor and a sensing area of a second sensor near the first sensor; a reference value storage for storing a preset reference value for the first sensor and the second sensor; and a comparator for comparing a value derived from the local number of moving objects counted by the moving object counter with the preset reference value stored in the reference value storage to determine the first sensor to be in trouble when a difference between the value derived from the local number of moving objects and the preset reference value exceeds a predefined threshold value. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A sensor diagnostic method executed by a sensor diagnostic apparatus for diagnosing a sensor among a plurality of sensors, each of said plurality of sensors identifying an object and outputting acquired identification data, said sensor diagnostic method comprising:
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counting, in accordance with identification data acquired by the plurality of sensors in a predefined time period, a local number of moving objects moving between a sensing area of a first sensor and a sensing area of a second sensor near the first sensor; storing a preset reference value for the first sensor and the second sensor; and comparing a value derived from the local number of moving objects counted in the operation of counting a local number of moving objects with the preset reference value to determine the first sensor to be in trouble when a difference between the value derived from the local number of moving objects and the preset reference value exceeds a predefined threshold value. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification