Automotive cargo space occupant detector
First Claim
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1. An abnormality alarm apparatus, comprising:
- at least one electrically conductive member provided in a load-carrying compartment isolated from a passenger compartment of a vehicle;
an oscillator circuit that is connected to the at least one electrically conductive member and that changes an oscillating frequency based on a change in capacitance of a space near the at least one electrically conductive member;
a frequency change detection circuit that detects a moving object in the space near the at least one electrically conductive member based on a change in the oscillating frequency of the oscillator circuit; and
an alarm device that produces an alarm based on a result of detection by the frequency change detection circuit, wherein the alarm device produces the alarm when the frequency change detecting circuit detects the moving object during stoppage of the vehicle.
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Abstract
A moving object detecting apparatus, an abnormality alarm apparatus, and a load-carrying compartment opening control apparatus each have an oscillator circuit, an antenna, and a frequency fluctuation detector. If a moving object, such as a human or the like, exists near the antenna when a signal from the oscillator circuit is transmitted from the antenna, the load on the antenna fluctuates due to fluctuations in capacitance involved in the movement of the object. Due to the fluctuations in the antenna load, the oscillating frequency of the oscillator circuit fluctuates. The frequency fluctuations are detected by the frequency fluctuation detector.
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Citations
19 Claims
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1. An abnormality alarm apparatus, comprising:
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at least one electrically conductive member provided in a load-carrying compartment isolated from a passenger compartment of a vehicle;
an oscillator circuit that is connected to the at least one electrically conductive member and that changes an oscillating frequency based on a change in capacitance of a space near the at least one electrically conductive member;
a frequency change detection circuit that detects a moving object in the space near the at least one electrically conductive member based on a change in the oscillating frequency of the oscillator circuit; and
an alarm device that produces an alarm based on a result of detection by the frequency change detection circuit, wherein the alarm device produces the alarm when the frequency change detecting circuit detects the moving object during stoppage of the vehicle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A load-carrying compartment opening control apparatus comprising:
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at least one electrically conductive member provided in a load-carrying compartment isolated from a passenger compartment of a vehicle;
an oscillator circuit that is connected to the at least one electrically conductive member and that changes an oscillating frequency based on a change in capacitance of a space near the at least one electrically conductive member;
a frequency change detection circuit that detects a moving object in the space near the at least one electrically conductive member based on a change in the oscillating frequency of the oscillator circuit; and
an opener that opens an open-close member of the load-carrying compartment when the frequency change detection circuit detects the moving object during a stoppage of the vehicle. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification