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In-vehicle body detection method

A technology for vehicles and the human body, applied in the direction of measuring devices, detection with electromagnetic waves, diagnostic recording/measurement, etc., to achieve the effect of energy saving

Inactive Publication Date: 2004-01-14
FUJITSU GENERAL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, since the movement to be detected inside the vehicle is very small respiratory movement, the sensitivity of the sensor needs to be increased, but the movement outside the vehicle is also easy to detect (the second problem)

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0062] In the case of a person in the vehicle, due to his breathing movement, oscillations are generated in the reflected waves of the microwaves emitted from the sensor. As described above, if high-frequency microwaves are used, there is no influence on the movement outside the vehicle, and there is a possibility of detecting it when there is a large movement outside the vehicle. However, detection is single-shot as movement outside the vehicle, such as when pedestrians pass by. On the other hand, breathing motion is continuously detected when there is a person in the vehicle. Therefore, it can be determined that a human body is present in the vehicle when vibrations are continuously generated in the reflected waves of microwaves for a long time, for example, several minutes. On the other hand, when this is not the case, it can be seen as movement outside the car.

[0063] Figure 13 is a flowchart illustrating an embodiment of the inventive method based on the above consi...

Embodiment 2

[0067] When there are people in the vehicle and it becomes a dangerous state, it mainly means that the temperature inside the vehicle rises to a high temperature or becomes a low temperature. Therefore, the effect is that instead of always monitoring whether there is a person in the vehicle, the sensor is activated to detect the presence of a human body in the vehicle when the temperature in the vehicle rises to a high temperature or is about to become high. Also, since this is not always detected, the possibility of detecting motion outside the vehicle can be reduced.

[0068] Figure 14 is a diagram illustrating the method of the present invention based on the above considerations. exist Figure 14 In , the horizontal axis is time, and the vertical axis is temperature in the vehicle. Always monitor the temperature inside the vehicle and activate the sensor when it becomes hot inside the vehicle. Such as Figure 14 As shown, when the temperature inside the vehicle reache...

Embodiment 3

[0071] In the case of the second embodiment, the sensor is activated after the dangerous temperature is reached to detect the presence or absence of a human body in the vehicle. However, in the case of the second embodiment, it takes several minutes after the sensor operates to detect the presence or absence of a human body in the vehicle, which may cause damage to the human body in the vehicle. In order to avoid this situation, in Embodiment 3, a device for monitoring the temperature gradient (inclination) in the vehicle is provided, and when the device predicts that the temperature rise (or drop) in the vehicle becomes a dangerous temperature, the sensor Work.

[0072] Figure 15 is a diagram illustrating the method of the present invention based on the above considerations. exist Figure 15 In , the horizontal axis is time, and the vertical axis is temperature in the vehicle. The temperature in the vehicle is constantly monitored, and when the temperature gradient in th...

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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.

Description

technical field [0001] The present invention relates to a method of detecting the presence of a human body, in particular to a method of detecting the presence of a human body in a vehicle. Background technique [0002] Accidents in which children who are placed in vehicles in the hot summer and die due to the high temperature in the vehicle occur from time to time. In order to prevent such tragic accidents, a system that detects whether there are people in the vehicle and issues some kind of warning when the temperature in the vehicle becomes high is considered. [0003] figure 1 It is a figure of the example of the sensor which detects the presence of the person etc. which broke into a vehicle. In this figure, 1 is a sensor, and 2 is an object, in this case, the human body of an intruder. In the sensor 1 , an oscillator 11 emits an output of, for example, 2.45 GHz, and the output is irradiated onto the human body 2 from a transmitting antenna 12 . The reflected wave fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/56G01V3/12G08B21/02
CPCG01V3/12A61B5/0507A61B5/7239
Inventor 土桥长一郎筱岛靖
Owner FUJITSU GENERAL LTD
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