JPH09254633A - Thermal harm preventing device in vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent thermal harm such as thermal death in a vehicle by oscillating a high frequency signal including frequency scanning means, transmitting it to a sensor including a resonance circuit, detecting a signal according to the external condition of the sensor, judging the existence of a human body from the detected signal and an oscillated frequency, and controlling an air conditioner in an interior. SOLUTION: In a human body sensor 1, a high frequency signal is generated in an oscillator 13 and supplied to a sensor 11 through a transmission pass 14, and the high frequency signal of an oscillator 12 is scanned in a range of from 30MHz to 50MHz. The high frequency signal supplied to the sensor 11 is reflected, and the magnetic permeability and displacement current of a body differ from each other according to the body placed in the vicinity of a detecting coil 21 in the sensor 11, therefore the impedances of the sensor 11 differ from each other, and the vicinity of the coil 21, that is, the levels of a reflected wave generated by an external condition differ from each other. This reflected wave is detected by a reflected wave sensor 13, and vacancy, cargos, human bodies, and so on are judged and detected from the reflected wave level and the frequency in a controller 15, and temperature is controlled by an interior temperature controlling part 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat damage prevention device for preventing heat damage such as heat death in a vehicle.

[0002]

2. Description of the Related Art Every summer, an infant may be left in a car in a parking lot or other places exposed to direct sunlight, causing dehydration, impairing his health, or causing severe heat death. . Conventionally, in order to prevent such heat damage, an air conditioner (or a cooler) is operated when a guardian leaves the vehicle.

[0003]

[Problems to be Solved by the Invention] A guardian may feel at ease by operating a cooler, and if the engine does not easily return to the inside of the vehicle, the engine may happen to stop due to lack of gas or the like, and the cooler may also stop. . In addition, when an infant is in the vehicle, the infant may raise the temperature setting of the air conditioner (or cooler) or heat it. In this case, the temperature inside the vehicle rises abnormally, leading to terrible heat death.

The present invention has been made in view of the above problems, and an object thereof is to provide a heat damage prevention device capable of preventing heat damage such as heat death in a vehicle.

[0005]

According to a first aspect of the present invention, there is provided an in-vehicle heat damage prevention device, which comprises frequency scanning means for oscillating a high frequency signal and automatically changing the oscillation frequency. An oscillating section including; a sensor section including a resonance circuit; a transmitting section that transmits a high frequency signal from the oscillating section to the sensor section; a detecting section that outputs a signal according to an external condition of the sensor section; A human body sensor including a control unit that determines the presence or absence of a human body based on the oscillation frequency, and an in-vehicle temperature control unit that receives a human body presence / absence signal from the human body sensor and controls an air conditioner in the vehicle.

A heat damage prevention device for a vehicle according to a second aspect of the present invention is the sensor according to the first aspect, wherein the oscillating section generates a high frequency signal and the high frequency signal is transmitted through a transmission line and includes a resonance circuit. The signal is supplied to the sensor unit, the signal reflected from the sensor unit to the transmission path is detected according to the external situation, and the human body is detected by the reflected signal. Further, a heat damage prevention device for a vehicle according to a third aspect is the device according to the first aspect, wherein the oscillating section oscillates a high frequency signal, and sequentially changes the oscillation signal to form a resonance circuit via a transmission line. It is supplied to a sensor unit including the above, and each reflected power for each oscillated frequency is measured, and the presence or absence of a human body is detected from the relationship between each frequency and the reflected power.

A vehicle interior heat damage prevention device according to a fourth aspect is the device according to the first aspect, wherein the coil of the sensor unit is incorporated in the child seat, and the presence / absence signal of the human body is wired or wireless to the control unit. It is transmitted by. According to a fifth aspect of the present invention, there is provided an in-vehicle heat damage prevention device that oscillates a high frequency signal and changes the level of the oscillation signal according to the presence or absence of a human body in the vicinity. A human body sensor including a detecting unit for detecting a human body and a human body sensor that receives a detection signal from the detecting unit and determines the presence or absence of a human body according to the level of the detection signal and outputs a human body presence / absence signal. From the signal from the presence or absence of the human body from
An in-vehicle temperature control unit for controlling an air conditioner in the vehicle is provided.

In the in-vehicle heat damage prevention device according to any one of claims 1 to 5, when a baby or an infant is detected by the human body sensor in the vehicle, the detection output thereof causes the temperature of the air conditioner to rise above a predetermined value. Control not to go up.
Further, the in-vehicle heat damage prevention device according to claim 6 is the device according to claim 5, wherein a filter is provided between the detection unit and the control unit of the human body sensor and oscillates at a higher frequency than the human body detection unit. It has the function of amplifying the signal and correcting the level of the detected signal.

The heat damage prevention device for an in-vehicle device according to a seventh aspect is the device according to the fifth aspect, wherein the human body sensor is provided with a frequency counter, and the signal amplification factor of the detection section is determined according to the oscillation frequency of the oscillation section. I am trying to change. Further, the in-vehicle heat damage prevention device according to claim 8 is the device according to claim 7, wherein a human body sensor is provided with a frequency counter, and when the oscillating frequency of the oscillating unit is higher than that of the human body or an empty seat, it is determined as a human body. I try not to.

In the in-vehicle heat damage prevention device according to the sixth to eighth aspects, the human body can be surely distinguished from the metal, and the air conditioner can be surely controlled only when the human body is detected. In the in-vehicle heat damage prevention device according to claim 9, the coil of the oscillating unit is incorporated in the child seat, and the presence / absence signal of the human body is transmitted to the control unit by wire or wirelessly.

A heat damage prevention device for a vehicle according to a tenth aspect of the present invention is the device according to the first or fifth aspect, wherein:
It has a function to lower the power window when the engine stops in the human body detection state. An in-vehicle heat damage prevention device according to claim 11 oscillates a high frequency signal and includes an oscillating unit including a frequency scanning unit that automatically changes the oscillating frequency, a sensor unit including a resonance circuit, and the oscillating unit. From a transmission unit that transmits a high-frequency signal from the unit to the sensor unit, a detection unit that outputs a signal according to the external situation of the sensor unit, and a control unit that determines the presence or absence of a human body from the detection signal and the oscillation frequency. When the human body sensor detects that there is a human body in the vehicle, and the temperature inside the vehicle exceeds a certain value, and the temperature setting value of the air conditioner is high and the power window is closed, Equipped with a function to issue an alarm.

According to this in-vehicle heat damage prevention device, even if the engine is stopped and the air conditioner is stopped, the power window is lowered and the outside air is passed therethrough, so that the temperature rise inside the vehicle can be reduced. In addition, the heat damage prevention leaving in the vehicle according to claim 12
An oscillating unit that oscillates a high-frequency signal and changes the level of the oscillating signal depending on the presence or absence of a human body in the vicinity, a detecting unit that receives and detects the high-frequency signal of the oscillating unit, and a detection signal of the detecting unit. It is equipped with a human body sensor consisting of a control unit that determines the presence or absence of a human body according to the level of the detection signal and outputs a human body presence signal, and a temperature sensor.The human body sensor detects the presence of a human body in the vehicle and It has a function to issue an alarm when the temperature exceeds a certain value, the temperature setting value of the air conditioner is high, and the power window is closed.

According to a thirteenth aspect of the present invention, there is provided a heat damage prevention device for a vehicle based on a child detecting means for detecting the presence of a child including an infant in the vehicle, and the child detecting means detecting a child. , And a control means for controlling on / off of an air conditioner in the vehicle, opening / closing of a window, or an alarm means. In this in-vehicle heat damage prevention device, when there are children including infants in the vehicle, the child detecting means detects this and controls the air conditioner in the vehicle in response to the detection so that the temperature does not exceed the predetermined temperature. Control or open the window or activate the alarm means to alert the surroundings.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to embodiments. FIG. 1 is a circuit diagram showing a configuration of a heat damage prevention device in a vehicle according to an embodiment of the present invention.
The heat damage prevention device according to this embodiment includes a human body sensor 1 and a vehicle interior temperature control unit 2. The human body sensor 1 includes a sensor unit 11, an oscillating unit 12 that transmits a high-frequency signal to the sensor unit 11 via a transmission path 14, and a high-frequency signal supplied to the sensor unit 11 is reflected by the sensor unit 11 and oscillates. Reflected wave sensor unit 13 for detecting a reflected signal returning to the 12 side
And a control unit 15 that takes in the detected reflection signal and performs signal processing.

The sensor unit 11 is, here, a detection coil 21.
A resonance capacitor 22 forming a series resonance circuit with the detection coil 21; and a real transformer 23 whose primary side is connected to the input side resonance circuit and whose secondary side is connected to the high frequency input terminal 24 and the ground GND. It is composed of However, a parallel resonance circuit may be used as the resonance circuit. As the detection coil 21, a single-turn circular air-core coil having a diameter of 200 mm is used.
1, the oscillation unit 12, the reflection sensor unit 13, and the control unit 15 are housed in a circuit case body. The detection coil 21 is
200mm diameter coil and 100mm diameter coil
Either one of these two coils may be selected and used depending on the application, or they may be connected in series and used.

The detecting coil 21 may be wound around a magnetic core so that the magnetic field is generated only in one direction orthogonal to the surface of the coil 21. Further, the number of turns and the diameter of the coil may be appropriately changed depending on the object to be detected. As the conductor of the detection coil 21, Au (gold), Ag (silver), Cu (copper), Al (aluminum), or the like, which is a good conductor of a high-frequency signal, is used. By forming the coil 21 with a good conductor, sensitivity is improved and high-frequency power loss is reduced.

The oscillating unit 12 uses an LC resonance type oscillating circuit here, but the oscillating circuit itself may be another circuit as long as it is a well-known high frequency oscillating circuit, for example, a crystal oscillator or a PLL. May be The oscillation unit 12
Includes a variable capacitor 41, and automatically changes the capacity of the variable
2, the frequency of the high-frequency signal output from
Scan in the range of HZ to 50 MHZ. The scanning mechanism may be provided in the oscillating unit 12 itself, or may be changed by driving the motor 53 according to a command from the control unit 15.

Further, the reflected wave sensor unit 13 includes a transmission line 14
, A resistor 32 connected to one end of the capacitor, and a coil 33 connected in parallel with the resistor and M-coupled to the transmission line 14. The other end of the parallel circuit is connected to a diode 34. Connected to the anode of
The cathode of the diode 34 is connected to G via the capacitor 35.
The output signal is derived from the cathode while being ND-connected. The reflected wave sensor used here uses a CM-coupled sensor as described above.
Other sensors, such as by a coupling method, may be used.

The control unit 15 includes an A / D converter 51, a CPU
52, an analog signal from the reflected wave sensor unit 13 is converted into a digital signal, a logical process is performed based on the reflected wave level and frequency, and a discrimination detection process for vacant seats, luggage, and seating of a human body (adult, child) is performed. . As shown in FIG. 2, the detection coil 21 of the human body sensor 1 of the above-described embodiment is embedded in the seat of a seat (passenger car, train, theater, etc.) 61, as shown in FIG.
Incorporated. The circuit section 40 of the human body sensor 1 is a seat 42.
It is installed inside or inside the vehicle body 43.

In the human body sensor 1 of this embodiment, a high frequency signal is generated by the oscillator 12 and supplied to the sensor 11 via the transmission line 14. The high frequency signal of the oscillation unit 12 is
As described above, scanning is performed in the range of 30 MHZ to 50 MHZ. The high-frequency signal supplied to the sensor unit 11 is reflected by the sensor unit 11. In the sensor unit 11, the impedance of the sensor unit 11 differs due to the difference in the magnetic permeability and displacement current of the object depending on the object placed in the vicinity of the detection coil 21. Wave levels are different. The reflected wave is detected by the reflected wave sensor unit 13, and the control unit 15 discriminates and detects the vacant seat, the baggage, the human body, and the like based on the reflected wave level and the frequency.

FIG. 3 is a circuit diagram showing an in-vehicle heat damage prevention device using a human body sensor different from that used in FIG. In this human body sensor 1, the sensor unit 11 and the reflected wave sensor unit 13 are the same as those shown in FIG. Oscillator 1
2 differs from that of FIG. 1 in that the PLL oscillator 49 is used. The oscillating unit 12 changes the high-frequency oscillation frequency according to a command from the CPU 52 of the control unit 15.

The vehicle interior temperature control unit 2 shown in FIGS.
The maximum temperature (limit temperature) inside the vehicle when a person is present is set in advance. Then, under the control of the vehicle interior temperature control unit 2, the air conditioner always operates so as to keep the temperature set by the driver at that time. The air conditioner mentioned here is a well-known one installed in a car. However, when the human body sensor 1 determines that there is a human body, the air conditioner is controlled by the vehicle interior temperature control unit 2 regardless of the temperature setting.
It is designed so that the maximum temperature setting value is not exceeded.

In the in-vehicle heat damage prevention device shown in FIGS. 1 and 3, when the oscillating portion 11 is oscillated, when the seat is vacant, the child is seated, the adult is seated, and the luggage is placed. The characteristics of the reflected wave are those shown in a, b, c, and d of FIG. According to this, when vacant seats a and d and luggage are placed, the reflected wave is very large at a certain frequency and the Q is high. When the human bodies b and c are seated, the reflected wave becomes large at a certain frequency, but the degree of change is small and Q
Is small. Such differences in the frequency characteristics of the reflected waves are caused by differences in the magnetic permeability and displacement current of vacant seats (air), luggage, human bodies, and the like.

Therefore, as shown in FIG. 5, the reflected wave level detected by the reflected wave sensor unit 13 is the reference value S _R.
Thus, if the frequency is small over the entire frequency range, the person is seated. Conversely, if there is a frequency of the reflected wave higher than the reference value S _R ,
Indicates that an empty seat or luggage is loaded. The CPU 52 of the control unit 15 performs the above-described human body, vacant seat, and baggage discrimination processing.

In the heat damage prevention apparatus of the embodiments shown in FIGS. 1 and 3, when a person gets in a vehicle, the human body sensor 1 detects the person getting in and sends a detection signal to the temperature control apparatus 2. Upon receiving this signal, the temperature control device 2 controls the air conditioner so that it does not rise above the maximum temperature set value preset in the device, regardless of the temperature of the air conditioner set. As a result, the temperature does not rise above the maximum temperature set value even when an infant or the like puts it into heating or the like, or receives solar heat from the outside of the vehicle, so that an abnormally high temperature inside the vehicle can be prevented.

FIG. 6 is a diagram showing an example in which a human body sensor is incorporated in a child seat. If a human body sensor is embedded in the seat of a car and a child seat is placed on it, the human body sensor in the seat may not react even when a child is seated. Therefore, here, the child seat 60 is provided with the detection coil 21, the human body sensor circuit 40, the transmission unit 61, and the antenna 62 of the human body sensor 1.

FIG. 7 shows another embodiment of the present invention.
It is the schematic of the heat damage prevention apparatus in the vehicle equipped with the child seat 60 with a human body sensor. The heat damage prevention device includes a human body sensor 1a, 1b installed in a seat, a vehicle interior temperature control unit 2, a receiving unit 63, and an antenna 64. Of course, the child seat 60 is also provided with the human body sensor 1c and the antenna 62. In addition,
The human body sensors 1a, 1b, 1c are the same as those shown in FIGS.

In this heat damage prevention device, the human body sensor 1c of the child seat 60 detects whether an infant is present,
If present, the signal is wirelessly transmitted from the transmission unit 61 and the antenna 62 to the vehicle interior temperature control unit 2 via the antenna 64 and the reception unit 63. The vehicle interior temperature control unit 2 performs the same operation as described with reference to FIGS. 1 and 3. FIG. 8 is a schematic view showing a heat damage prevention device in a vehicle according to another embodiment of the present invention. In addition to the circuit configuration of FIG. 7, this heat damage prevention device further includes an in-vehicle control unit 65, a temperature sensor 66 that detects the temperature inside the vehicle, a limit temperature setting switch 67, and a power window drive unit 68.

In the heat damage prevention apparatus according to this embodiment, when the human body is detected by the human body sensors 1a, 1b, 1c, the temperature control section 2 controls the temperature so that the temperature detected by the temperature sensor 66 is limited. Do not exceed the temperature. For some reason, the air conditioner stops due to engine stop etc.
When the temperature detected by the temperature sensor 66 exceeds the limit temperature and rises, the power window drive unit 68 is operated to lower the power window and open the window.

FIG. 9 is a circuit diagram showing a heat damage preventing device for a vehicle according to another embodiment of the present invention. This heat damage prevention device uses a human body sensor different from those shown in FIGS. The human body sensor 1 used here has an oscillating unit 70 that oscillates a high-frequency signal, a detection circuit 80 that detects a high-frequency signal output from the oscillating unit 70, and a human body that receives the detection signal from the detection circuit 80. The control unit 90 determines whether or not

The oscillating unit 70 includes a detecting coil 71, a capacitor 72 connected in parallel to the detecting coil 71 and having one end grounded, a resistor 73 connected in parallel to the capacitor 72, and a parallel connection of these. The FET 74 has the other end connected to the gate, a series circuit of capacitors 75 and 76 connected between the gate of the FET 74 and the ground, and a resistor 77 connected in parallel with the capacitor 76.
Connection point of the capacitor 75 and 76 is connected to the drain of the FET 74, V _CC power source is connected to the source of the FET 74. The oscillating unit 70 is a Colpitts type LC oscillator, and does not need to be a novel oscillator itself. Thus, other well-known oscillators, such as a Hartley oscillator, may be used.

The oscillating frequency of the oscillating unit 70 is desirably a high frequency signal of 10 MHz or more.
When 1 is a single turn, the thickness of the number of cores is 1.2 mm and the diameter is 200 mm. The diameter of the coil 71 can be appropriately selected from about 150 mm to 300 mm. The capacitor 72 is 27 PF, and the resistor 73 is, for example, a variable resistor. The sensitivity can be adjusted by changing from 10 KΩ to 150 KΩ. Capacitors 75, 7
6 are each 47 PF. The resistance 77 is 470Ω. However, these constants are merely examples, and may be appropriately selected according to the frequency to be oscillated.

The detection unit 80 includes a capacitor 8 connected to one end of a drain of an FET 74 which is an output terminal of the oscillation unit 80.
1, a diode 82 having a cathode connected to the other end of the capacitor 81 and an anode grounded, and a diode 8 having an anode connected to the other end of the capacitor 81.
3 and a capacitor 84 connected between the cathode of the diode 83 and the ground, and a detection signal is output from the cathode of the diode 83.

The control unit 90 includes an NPN transistor 91 to which the output signal of the detection unit 80 is applied to the base via a resistor 92, the emitter is connected to ground, and a signal indicating the presence or absence of a human body is output from the collector. When the oscillating unit 70 is oscillated in the state where the human body sensor 1 is incorporated in the seat, the characteristics of the reflected wave when the seat is vacant, the child is seated, the adult is seated, and the luggage is placed. Is Figure 4
The characteristics are similar to those of a, b, c, and d. However, the reflected wave in FIG. 4 is a detection output. According to this, Q is high when vacant seats a and d are placed and luggage is placed, and Q is small when human bodies b and c are seated. That is, as shown in FIG. 10, the reciprocal of the value of A when B / C = 0.7 is proportional to the Q value. Thus, when the Q value of FIG. 4 is obtained, the Q value decreases in the order of vacant seat>baggage>child> adult. Therefore, if the reference value of ON / OFF in the control unit 90 is set between the luggage and the child, it is possible to detect whether or not the human body is seated.

Now, in the apparatus of FIG. 9, is there an empty seat?
Assuming that a package other than a human body is placed, in these cases, the Q of the detection coil 71 is high, and therefore, the oscillation unit 70 oscillates and outputs a high-frequency signal (10 MHZ). This high-frequency signal is detected by the detector 80 and input to the transistor 91 of the controller 90. In this case, the input level to the transistor 91 is high and the transistor 9
1 turns ON. This ON is output as a signal indicating that there is no human body. Next, when a person sits on the seat 42, the Q of the detection coil 71 decreases due to the influence of the magnetic permeability of the human body.
Therefore, the oscillation of the oscillating unit 70 stops or weakens, and accordingly, the level of the high-frequency signal input to the detecting unit 80 becomes 0 or small, and accordingly, the detected signal from the detecting unit 80 is also low. Therefore, the transistor 91 is turned off.
Becomes This OFF is output as a signal having a human body.

When a human body presence signal is received from the human body sensor 1, the vehicle interior temperature control unit 2 operates in the same manner as that shown in FIGS. FIG. 11 is a circuit diagram showing the configuration of a heat damage prevention device in a vehicle according to another embodiment of the present invention. The human body sensor 1 is the same as that of FIG. 9 in the basic configuration including an oscillation unit 70, a detection unit 80, and a control unit 90. However, the control unit 90 includes an output relay 93. A limit temperature setting switch 67 is connected to the vehicle interior temperature control unit 2.

In this heat damage prevention device, the limit temperature inside the vehicle when a person is present is set in advance by the limit temperature setting switch 67. Normally, the air conditioner operates so as to maintain the target temperature set at that time. However, when the human body sensor 1 determines that there is a human body, the in-vehicle temperature control unit 2 controls so as not to exceed the maximum temperature set value regardless of the temperature setting.

FIG. 12 is a circuit diagram showing the construction of a heat damage prevention device for a vehicle which employs a different human body sensor 1.
It is the same as that of FIG. 9 and FIG. 11 in that the oscillator 70, the detector 80, and the controller 90 are provided. 9 and 1
When the human body sensor 1 of 1 is used to detect a human body and an object, as shown in FIG. 13, the level of the metal object is non-metal and is close to the human body level, and the metal object is also detected as the human body. There is a risk.

The in-vehicle heat damage prevention apparatus of the embodiment shown in FIG. 12 is designed to prevent malfunction due to a metal plate or the like by paying attention to the high oscillation frequency of a metal object. Therefore, the human body sensor 1 of the heat damage prevention device of this embodiment further includes a filter circuit 100. Filter circuit 10
0 is composed of a high frequency filter 101 which receives the output of the oscillating unit 70 at its input, a detection circuit 102 which detects the output thereof, and an amplifier 103 which amplifies the detected output.

Now, when a human body is seated on the seat, the oscillation output of the oscillating unit 70 becomes small and is detected by the detecting unit 80.
The signal level input to the control unit 90 is smaller than the reference value SR _{1 as} shown in FIG.
Outputs a human body presence signal to the vehicle interior temperature setting unit 2. In the case of a human body or non-metal, since the oscillation frequency of the oscillator 70 is low, it is cut by the high frequency filter 101. On the other hand, when a metal body is placed on the seat, the oscillation output of the oscillation unit 70 also decreases. However, the oscillation frequency in this case is higher than that of a human body or a non-metal object, as shown in FIG. With respect to the output of the oscillating unit 70, only high frequency components are derived by the high frequency filter 101, detected by the detection circuit 102, and the amplifier 10
It is amplified to a predetermined level at 3. The amplified output signal is input to the control unit 90, but since it is amplified by the amplifier 103 so that the level becomes higher than the reference value SR ₁ , the control unit 90 does not judge that there is a human body. Therefore, the metal body is not erroneously determined as a human body.

When the human body presence signal is received from the human body sensor 1, the vehicle interior temperature control unit 2 operates in the same manner as that shown in FIGS. FIG. 14 is a block diagram showing the configuration of a heat damage prevention device in a vehicle according to another embodiment of the present invention. This heat damage prevention device also employs a human body sensor 1 that does not erroneously detect a metal body as a human body. Although the oscillator 70, the detector 80, and the controller 90 are provided, they are the same as those in FIG.
Frequency counter 111 that counts the output of the oscillator 70
And an amplification factor control unit 112 that controls the amplification factor of the amplifier 82 according to the frequency.

In the human body sensor 1 of this heat damage prevention device, when a human body or a non-metal object is present, the human body sensor 1 detects and identifies the same by the same operation as the human body sensor described above. When the metal body is placed in the vicinity, the oscillation frequency of the oscillating unit 70 increases. The oscillation output of this high frequency is counted by the frequency counter 111, and as the frequency is higher, the amplification factor control unit 112 increases the gain of the amplifier 82 in response thereto. The oscillator 70
Although the oscillating output has a lower level due to the presence of a metal body, the level is increased by the amplifier 82, so that a high level input similar to that of a non-metal object is applied to the control unit 90.
Therefore, the metal body does not malfunction with the human body.

FIG. 15 is a block diagram showing the structure of a heat damage preventing device for a vehicle according to another embodiment of the present invention.
This heat damage prevention device also includes a human body sensor 1 that does not malfunction when the metal body is a human body. The human body sensor 1 used here also includes an oscillator 70, a detector 80, and a controller 90. Further, a frequency counter 111 that counts the oscillation frequency of the oscillator 70 is provided, and the controller 90 includes a detector 80.
An A / D converter 95 for converting the output of the
It is composed of a CPU 96.

In the human body sensor 1 of this heat damage prevention device, in the case of a human body, the oscillation output of the oscillating section 70 is lowered, and the oscillation output is detected by the detecting section 80, and is passed through the A / D converter 95. It is taken in by the CPU 96. In the case of a non-metal object, the output level of the oscillation unit 70 does not decrease, and its oscillation output is sent to the CPU via the detection unit 80 and the A / D converter 95.
96. The CPU 96 compares the captured signal level with a reference value to identify a human body and a non-metal object. In the case of a metal body, the oscillation output of the oscillation unit 70 decreases and the oscillation frequency increases. Frequency counter 1
A count value indicating a high frequency is taken into the CPU 96 by the frequency count of 11, and the CPU 96 lowers the reference value, for example, SR ₂ in FIG. Therefore,
Although the signal level taken in via the detection unit 80 and the A / D converter 95 is lowered, the reference level is lowered to SR ₂ and therefore the signal level is still higher than the reference value. Therefore, the CPU 96 does not determine that the body is a human body, and does not output the human body presence signal to the temperature control unit 2. Therefore, the metal body is not erroneously detected as a human body.

FIG. 16 is a block diagram showing the structure of a heat damage prevention apparatus for a vehicle according to another embodiment of the present invention.
The heat damage prevention device of this embodiment includes human body sensors 1a, 1b, ... For each seat, a vehicle interior control unit 65, a temperature sensor 66, a limit temperature setting switch 67, a vehicle interior temperature control unit 2, and a power window. A drive unit 68, a window position sensor 69, and an alarm device 120 are provided.

In this heat damage prevention device, the human body sensor 1a,
1b, ..., While the human body detection signal is being input to the vehicle interior control unit 65, the vehicle interior temperature detected by the temperature sensor 6 exceeds, for example, 30 ° C., and the set temperature of the air conditioner is high. When the position sensor 69 detects that the power window is closed, the vehicle interior control unit 65 operates the alarm device 120 to issue an alarm (for example, a horn) to the outside. As a result, a person passing nearby notices that the temperature of the stopped vehicle is rising, and appropriate measures can be taken at an early stage to prevent heat death. The human body sensor used here may be one shown in FIGS. 1 and 3, or any one of FIGS. 9, 11, 12, 14, and 15.

FIG. 17 is a block diagram showing the structure of a heat damage prevention apparatus for a vehicle according to another embodiment of the present invention.
The heat damage prevention device of this embodiment includes a negative pressure sensor 121 in place of the window position sensor 69 and the alarm device 120 of the device shown in FIG. The negative pressure sensor 121 generates a negative pressure in the air intake portion of the engine while the engine is rotating, and when the engine stops, the negative pressure becomes equal to the atmospheric pressure.
The engine stop is detected when the negative pressure is zero.

In this heat damage prevention device, the human body sensor 1a,
When a human body detection signal is being input to the vehicle interior control unit 65 from 1b, ..., When the temperature sensor 66 exceeds the set maximum temperature and the negative pressure sensor 121 detects engine stop, power window drive is performed. The part 68 is operated to open the window. With this, the inside of the car is opened to the outside air,
The temperature inside the vehicle can be lowered to prevent the occurrence of heat damage such as heat death.

In each of the above embodiments, the presence or absence of an infant in the vehicle is detected by the human body sensor using the detection coil. However, the child detection means in the vehicle may use a sensor other than the coil. Good. For example, a plurality of transmissive or reflective photoelectric switches are arranged vertically and / or horizontally,
The child may be detected by distinguishing between an adult and a child.

[0050]

According to the signals according to claims 1 to 5, when the baby or infant is detected by the human body sensor in the vehicle, the detected output raises the temperature of the air conditioner to a predetermined value or higher. Since it is controlled so that it does not exist, it is possible to prevent the heat death of infants in the car and protect the safety of children. Further, since the human body sensor based on the change in magnetic permeability and displacement current is used, it is strong against electromagnetic field immunity. It is small. Not affected by weight. No need to touch human body.
And so on.

In addition to the above effects, according to the sixth to eighth aspects of the present invention, the human body and the metal can be reliably distinguished, and the air conditioner can be reliably controlled only when the human body is detected. Therefore, it is possible to prevent erroneous detection of metal as a human body. Further, according to the invention of claim 9, since the human body sensor is incorporated in the child seat and the presence / absence signal of the human body is wirelessly transmitted to the temperature controller, the child seat is placed on the seat in addition to the above effect. Even in this case, it is possible to reliably detect the human body.

According to the tenth aspect of the invention, since the power window is lowered when the engine stops in the human body detection state, the power window is stopped even if the engine stops and the air conditioner stops. It is possible to lower the temperature to let in the outside air, avoid the temperature rise inside the vehicle, and prevent the occurrence of heat damage. Further, according to the inventions of claims 11 and 12, the human body sensor detects that a human body is present in the vehicle, the temperature inside the vehicle exceeds a certain value, the temperature setting value of the air conditioner is high, and the power window is closed. If an alarm is issued, a person in the surrounding area notices the possibility of heat damage in the vehicle and can take appropriate measures.

According to the thirteenth aspect of the present invention, it is possible to prevent heat death and the like of the child left in the vehicle, and to protect the child's safety.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a configuration of a heat damage prevention device in a vehicle according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating an installation state of a human body sensor of the heat damage prevention device.

FIG. 3 is a circuit diagram showing a configuration of a heat damage prevention device in a vehicle according to another embodiment of the present invention.

FIG. 4 is a frequency and reflected wave due to a signal from an oscillating unit depending on whether an empty seat, a seat (child), a seat (adult), or a luggage in the human body sensor of the heat damage prevention device in the vehicle shown in FIGS. It is a figure which shows the relationship of.

FIG. 5 is a diagram showing a frequency-reflected wave characteristic for explaining a human body sitting detection operation in the human body sensor.

FIG. 6 is a diagram illustrating a child seat used for a heat damage prevention device in a vehicle.

[Fig. 7] Fig. 7 is a block diagram showing the configuration of a heat damage prevention device in a vehicle including a child seat according to still another embodiment of the present invention.

FIG. 8 is a block diagram showing a configuration of a heat damage prevention device in a vehicle according to still another embodiment of the present invention.

FIG. 9 is a block diagram showing a configuration of a heat damage prevention device in a vehicle according to still another embodiment of the present invention.

FIG. 10 is a diagram for explaining how to obtain Q in the human body sensor of the heat damage prevention device for the vehicle interior of the embodiment shown in FIG. 9;

FIG. 11 is a block diagram showing a configuration of a heat damage prevention device in a vehicle according to still another embodiment of the present invention.

FIG. 12 is a block diagram showing a configuration of a heat damage prevention device in a vehicle according to still another embodiment of the present invention.

FIG. 13 is a characteristic diagram for explaining erroneous detection in the human body sensor of the heat damage prevention device according to the embodiment of FIG. 9.

FIG. 14 is a block diagram showing a configuration of a heat damage prevention device in a vehicle according to still another embodiment of the present invention.

FIG. 15 is a block diagram showing a configuration of a heat damage prevention device in a vehicle according to still another embodiment of the present invention.

FIG. 16 is a block diagram showing a configuration of a heat damage prevention device in a vehicle according to still another embodiment of the present invention.

FIG. 17 is a block diagram showing the configuration of a heat damage prevention device in a vehicle according to still another embodiment of the present invention.

[Explanation of symbols]

 1 human body sensor 2 vehicle temperature control unit 67 limit temperature setting switch

Claims (13)

[Claims] 1. An oscillating section including a frequency scanning means for oscillating a high frequency signal and automatically changing the oscillation frequency, a sensor section including a resonance circuit, and a transmission of the high frequency signal from the oscillating section to the sensor section. Section, a detection section that outputs a signal according to the external condition of the sensor section, and a control section that determines the presence or absence of a human body from the detection signal and the oscillation frequency, and a human body sensor from the human body sensor. An in-vehicle heat damage prevention device comprising: an in-vehicle temperature control unit that controls an in-vehicle air conditioner in response to a presence / absence signal. 2. The oscillating unit generates a high frequency signal, supplies the high frequency signal to a sensor unit including a resonance circuit through a transmission line, and reflects the high frequency signal from the sensor unit to the transmission line according to external conditions. The in-vehicle heat damage prevention device according to claim 1, wherein an incoming signal is detected and a human body is detected by the reflected signal. 3. The oscillating unit oscillates a high frequency signal, supplies the oscillating signal to a sensor unit including a resonance circuit through a transmission line while sequentially changing the oscillating signal, and measures each reflected power for each oscillated frequency. The in-vehicle heat damage prevention device according to claim 1, wherein the presence or absence of a human body is detected based on the relationship between each frequency and the reflected power. 4. The heat damage in the vehicle according to claim 1, wherein the coil of the human body sensor unit is incorporated in a child seat and the presence / absence signal of the human body is transmitted to the temperature control unit in the vehicle by wire or wirelessly. Prevention device. 5. An oscillating unit that oscillates a high-frequency signal and the level of the oscillating signal changes according to the presence or absence of a human body in the vicinity, a detecting unit that receives and detects the high-frequency signal of the oscillating unit, and a detection signal of the detecting unit. In response to the level of the detection signal, the presence of a human body is discriminated, and a human body sensor including a control unit that outputs a human body presence signal and a human body presence signal from the human body sensor An in-vehicle heat damage prevention device comprising: an in-vehicle temperature control unit for controlling the air conditioner. 6. A filter is provided between the detection unit and the control unit of the human body sensor, and a function of amplifying an oscillation signal oscillated at a frequency higher than that of the human body detection unit and correcting the level of the detection signal is provided. The heat damage prevention device in the vehicle according to item 5. 7. A frequency counter is provided in the human body sensor,
6. The in-vehicle heat damage prevention device according to claim 5, wherein the signal amplification factor of the detection unit is changed according to the oscillation frequency of the oscillation unit. 8. A frequency counter is provided on the human body sensor,
The in-vehicle heat damage prevention device according to claim 7, wherein when the oscillating frequency of the oscillating unit is higher than that of a human body or an empty seat, it is determined to be a non-human body. 9. The in-vehicle heat damage prevention device according to claim 5, wherein the coil of the oscillating unit is incorporated in a child seat to transmit a human body presence / absence signal to the control unit by wire or wirelessly. 10. The in-vehicle heat damage prevention device according to claim 1, further comprising a function of lowering a power window when the engine is stopped. 11. An oscillation section including a frequency scanning means for oscillating a high frequency signal and automatically changing the oscillation frequency, a sensor section including a resonance circuit, and a transmission for transmitting the high frequency signal from the oscillation section to the sensor section. Unit, a detection unit that outputs a signal according to the external situation of the sensor unit, a control unit that determines the presence or absence of a human body from the detection signal and the oscillation frequency, and a temperature sensor, The human body sensor detects that there is a human body in the vehicle, and the temperature inside the vehicle exceeds a certain value,
Further, a heat damage prevention device in a vehicle, which is provided with a function of issuing an alarm when the temperature setting value of the air conditioner is high and the power window is closed. 12. An oscillating unit that oscillates a high-frequency signal and the level of the oscillating signal changes depending on the presence or absence of a human body in the vicinity, a detecting unit that receives and detects the high-frequency signal of the oscillating unit, and a detection signal of the detecting unit. In response to the level of the detection signal, the presence / absence of a human body is determined and a human body sensor including a control unit that outputs a human body presence / absence signal and a temperature sensor are provided. A heat damage prevention device in a vehicle, which is provided with a function of detecting and detecting an alarm when the temperature inside the vehicle exceeds a certain value, the temperature setting value of the air conditioner is high, and the power window is closed. . 13. A child detecting means for detecting the presence of a child including an infant in a vehicle, and on / off of a vehicle air conditioner or opening / closing of a window or an alarm based on the child detecting means detecting the child. An apparatus for preventing heat damage in a vehicle, comprising: a control unit that controls the unit.