Method for detecting human body in a vehicle
First Claim
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1. A method for detecting a human body in a vehicle, comprising:
- radiating a transmitted wave from a sensor provided in said vehicle;
obtaining a synthetic wave based on said transmitted wave and a reflected wave from a breathing human body;
detecting the presence or absence of a human in said vehicle on the basis of an envelope of said synthetic wave;
obtaining a relative velocity of the breathing human body by differentiating the envelope of said synthetic wave; and
detecting the presence or absence of a human in said vehicle on the basis of the relative velocity.
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Abstract
A synthetic wave is obtained which represents the synthesis of a transmitted wave radiated from a sensor and a reflected wave returned from a breathing human body, and the presence or absence of a human in the vehicle is detected from the envelope of the synthetic wave. When the presence of a human is detected continuously for a predetermined length of time, it is determined that a human is present in the vehicle.
27 Citations
11 Claims
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1. A method for detecting a human body in a vehicle, comprising:
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radiating a transmitted wave from a sensor provided in said vehicle; obtaining a synthetic wave based on said transmitted wave and a reflected wave from a breathing human body; detecting the presence or absence of a human in said vehicle on the basis of an envelope of said synthetic wave; obtaining a relative velocity of the breathing human body by differentiating the envelope of said synthetic wave; and detecting the presence or absence of a human in said vehicle on the basis of the relative velocity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 10, 11)
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8. A method for detecting a human body in a vehicle, wherein a synthetic wave is obtained which represents the synthesis of a transmitted wave radiated from a sensor and a reflected wave returned from a breathing human body, and the presence or absence of a human in said vehicle is detected from the envelope of said synthetic wave, and
wherein a device for monitoring a temperature gradient inside said vehicle is provided, and said sensor is activated in advance when it is predicted by said device that the interior of said vehicle is likely to reach a dangerous temperature.
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9. A method for detecting a human body in a vehicle, wherein a synthetic wave is obtained which represents the synthesis of a transmitted wave radiated from a sensor and a reflected wave returned from a breathing human body, and the presence or absence of a human in said vehicle is detected from the envelope of said synthetic wave, and
wherein a device for monitoring temperature gradient inside said vehicle is provided, and when the rate of change of temperature inside said vehicle is mild, said sensor is operated at a random timing for a predetermined length of time.
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Current AssigneeFujitsu Ten Limited (DENSO Corporation)
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Original AssigneeFujitsu Ten Limited (DENSO Corporation)
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InventorsShinojima, Yasushi, Tsuchihashi, Choichiro
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Primary Examiner(s)GARBER, CHARLES D
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Application NumberUS10/399,808Publication NumberTime in Patent Office1,363 DaysField of Search738/659, 340/545.3, 340/552, 340/584, 340/589, 340/448, 701/47US Class Current73/865.9CPC Class CodesA61B 5/0507 using microwaves or teraher...A61B 5/7239 using differentiation inclu...G01V 3/12 operating with electromagne...
