JPH0789150B2 - Personnel detection device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a device for detecting whether or not an occupant is seated on a vehicle seat, or whether or not an occupant is seated on a passenger seat in a theater, a hall, or the like. .

[Conventional technology]

For example, in some vehicles, forget to close the side window (driver seat door window, passenger seat door window, driver rear seat door window and passenger rear seat door window), sunroof (roof panel), etc. For the purpose of prevention, car audio control, etc., an occupant detection device for detecting the presence / absence of an occupant is provided.

In this case, the open side windows and / or the sunroof are controlled to be closed when no passenger is detected, or the presence / absence of a passenger is detected for each seat, and the car audio output balance is adjusted to suit the seats with passengers. Are in control.

An occupant detection device that has been commonly used in vehicles of this type has been known as a seat switch. This seating switch is a pressure-responsive switch embedded in the seat (chair) of each seat, and has a configuration in which the contacts are closed when the occupant is seated.

Figure 2a is a partial crushing perspective view of the driver's seat ST _FR vehicle, Referring to this figure, the seating switch is embedded in the seat cushion pad 31. That is,
When the seat cushion pad 31 is bent by the occupant's seat, pressure is applied to the seating switch and the switch contact is brought into contact (ON). It is released and the switch contact is turned off. Therefore,
Driver seat ST _FR by turning on / off the seating switch
It is possible to detect the presence / absence of passengers. Further, by disposing a similar seating switch on each seat, it is possible to detect the presence or absence of an occupant on each seat.

[Problems to be Solved by the Invention]

By the way, an occupant detection device using this type of seating switch is vulnerable to a shock because the switch mechanically contacts / disconnects due to the seating pressure of the occupant. Since strong force is applied, it is easy to cause a disorder. Further, since the contact switch is a contact switch, the service life of the contact portion is short, and the switch is turned on even when a luggage or the like is placed on a person other than the person, so that the seating detection of the person is not reliable.

Therefore, the present inventors installed a conductive layer having a wide surface on a vehicle seat, detected the electrostatic capacitance between the conductive layer and a so-called body such as a roof or floor, and increased the electrostatic capacitance. Then, we proposed an occupant detection device that detects the presence of an occupant (Japanese Patent Application No. 60-280300). According to this, the relative permittivity of human being is about
80, and since the capacitance increases when there is an occupant,
By monitoring the capacitance, occupant presence can be detected when it exceeds a predetermined reference value.

However, the capacitance is susceptible to erroneous detection under the influence of the surrounding environment such as the temperature and humidity inside the vehicle and whether or not there is an object at a slightly distant place, and it is difficult to set the reference value. There is. For example, if the capacitance is compared with a fixed reference value and it is larger than this, it means that there is a person, and if it is small, it means that there is no person. In response to a change in the occupant seat, the occupant, for example, may erroneously detect that there is a seat when the occupant is not seated on the vehicle seat, or if the fixed reference value is set to a high value to reduce this erroneous detection. Even if a relatively small person (child) sits in the car seat,
There is a high probability of missed detection.

An object of the present invention is to provide a simple and reliable personnel detection device.

[Means for Solving the Problems]

The personnel detection device of the present invention is a personnel containment means (ST _FR ); a first insulated from each other that forms an electric field with at least a portion of the personnel (MAN) accommodated in the personnel containment means interposed therebetween.
Electrode (EL _FR ) and second electrode (Flor); Capacitance detecting means for generating an electric signal (R1a / R8) corresponding to the capacitance (C _FR ) between the first electrode and the second electrode ( 2); storage means (R1b) for holding the electric signal; storage updating means (1 / Fig. 4a) for updating and storing the electric signal (R1a) in the storage means (R1b) at a predetermined cycle (0.1 sec). And, when the difference between the content of the electric signal generated by the capacitance detection means and the content of the signal held by the storage means exceeds a predetermined value, a comparison process for generating an electric signal (M1 = 1) indicating the presence of personnel. Means (1 / Fig. 4a);

In addition, in order to facilitate understanding, corresponding elements of the embodiments shown in the drawings and described later, reference symbols in the flowcharts, and the like are added in parentheses for reference.

In the later-described embodiments or examples of the present invention, the above-mentioned functional means are as follows. The item symbols are the same as the item numbers in the corresponding claims.

(2) The comparison processing means (1 / Fig. 4a) uses the difference (R1c = R1b).
-A value corresponding to the electric signal (R1a) generated by the capacitance detecting means (2) before R1a) exceeds the predetermined value (C1) is set as a reference value (Ref1); (M1 ＝
When the content of the electric signal (R1a) generated by the electrostatic capacitance detection means (2) becomes 1 or less and then the reference value (Ref1) or less, the electric signal (M1 = 0) indicating that there is no personnel is generated. .

(3) The comparison processing means (1 / Fig. 4a) has a holding means (M1) which holds the contents of the electric signal (M1 = 1/0) indicating the presence or absence of the personnel.

(4) The comparison processing means (1 / Fig. 4a) is the holding means (M
The reference value (Ref1) is held while 1) holds the signal (M1 = 1) indicating the presence of personnel.

(5) The comparison processing means (1 / Fig. 4b) includes the contents of the electric signal (R1a) generated by the capacitance detection means (2) and the storage means (R).
The difference (R1c = R1b−R1a) from the content of the signal held by 1b) indicates an increase in the capacitance (C _FR ) between the first electrode (EL _FR ) and the second electrode (Flor), and , The difference is the first predetermined value (C2)
When it exceeds, an electric signal (M1 = 1) indicating the presence of personnel is generated; an electric signal (R1) generated by the capacitance detecting means (2) is generated.
The difference (R1c = R1b-R1a) between the content of a) and the content of the signal held by the storage means (R1b) indicates the decrease of the electrostatic capacitance (C _FR ) and the difference is the second predetermined value ( When it is less than −C2), an electric signal (M1 = 0) indicating no personnel is generated.

(6) The comparison processing means (1 / Fig. 4a) has a holding means (M1) for holding the content of the electric signal (M1 = 1/0) indicating the presence or absence of the personnel.

(7) Capacitance detection means (2) has a frequency signal (R1a in FIG. 4a) corresponding to the capacitance (C _FR ) between the first electrode (EL _FR ) and the second electrode (Flor). / Includes oscillating means (OSC) for generating e) in FIG.

(8) The oscillating frequency of the electric signal generated by the oscillating means (OSC) decreases as the capacitance (C _FR ) increases.

(9) Electric signal (R1 generated by the capacitance detecting means (2)
a) is frequency data showing a numerical value corresponding to the frequency generated by the oscillating means (OSC).

(10) The capacitance detecting means (Fig. 12) includes a frequency / voltage converter (FV).

(11) The electric signal generated by the capacitance detecting means (Fig. 12) is a voltage signal (a) corresponding to the frequency generated by the oscillating means (OSC).

(12) The storage means (FIG. 12) is a sampling voltage holding means (SH).

(13) The memory updating means (FIG. 12) is a sampling signal generating means (CON) which generates a sampling signal (h) for instructing the sampling voltage holding means (SH) to sample the voltage, and a comparison processing means (CON). CMP) includes a blocking means (AN2) for blocking the generation of the sampling signal (h) when the electrical signal (e) indicating the presence of personnel is generated.

(14) The means for accommodating personnel (Fig. 2a) is the vehicle seat (S
T _FR ).

(15) The first electrode (El _{FR in} Fig. 2b) is attached to the sheet (S
_TFR ) is a conductive layer with a large surface attached to the second;
The electrodes (Flor in Figure 1a) are the body of the vehicle.

(16) The first electrode (EL _{FR in} Figure 8b) is a conductive layer with a wide surface to be mounted on the vehicle door trim; the second electrode is the vehicle body.

(17) The first electrode (EL _{FR in} Figure 8a) is a conductive layer that is attached to the vehicle armrest; the second electrode is the vehicle body.

(18) The first electrode (EL _{FR in} Figure 8c) is a conductive layer with a large surface that is mounted to the vehicle floor mat; the second electrode is the vehicle body.

(19) The conductive layer (EL _{FR in} FIG. 8c) is a thin film conductor such as a metal foil, a woven fabric of conductive fibers, or a conductive paint layer adhered to a film or the like.

(20) The personnel accommodation means (Fig. 10a) is a seat (100) installed in the building.

(21) The first electrode (140 in FIG. 10a) is a conductive layer having a wide surface to be mounted on the seat; the second electrode is a conductive layer (150) laid on the floor.

(22) The conductive layer forming the first electrode (140 in FIG. 10a) is a flexible thin film conductor such as a metal foil, a woven cloth of conductive fibers, or a conductive paint layer adhered to a film or the like. .

(23) The conductive layer forming the second electrode (150 in FIG. 10a) is a thin film conductor such as a metal foil, a woven fabric of conductive fibers, or a conductive paint layer adhered to a film or the like.

[Action]

Since the first electrode (EL _FR ) and the second electrode (Flor) form an electric field with at least a part of the personnel (MAN) accommodated in the personnel accommodation means (ST _FR ) interposed therebetween, When there are personnel (MAN) in the vicinity, the first electrode and the second
The capacitance (C _FR ) between the electrodes is large and small when not present. Therefore, by detecting the capacitance, the personnel (MAN) can be stored in the personnel accommodation means (ST _FR ) without contact.
Can be detected. Then, the capacitance detecting means (2) detects this capacitance (C _FR ).

By the way, the amount of change in capacitance (C _FR ) due to changes in the surrounding environment is relatively small, and the rate of change is low, but the personnel containment means (ST _FR ) has changed from "none" to "present" for personnel (MAN). The amount of change when changing is relatively large, and the change speed is high.

In the present invention, paying attention to this, the memory updating means (1 / Fig. 4a)
However, the electric signal (R1
a) is updated and stored in the storage means (R1b) at a predetermined cycle (0.1 sec), and the comparison processing means (1 / Fig. 4a) causes the electric signal (R1a) generated by the capacitance detection means (2). Between the contents of the signal and the contents of the signal held by the storage means (R1b) (R1c = R1b-R1a)
When exceeds a predetermined value (C1), an electric signal (M1 = 1) indicating the presence of personnel is generated. That is, if the electric signal (R1a) generated by the electrostatic capacity detection means (2) shows a change (increase in electrostatic capacity) exceeding a predetermined value (C1) within a predetermined time (0.1 sec), the comparison processing means (1 / Fig. 4a) generates an electric signal (M1 = 1) that indicates the presence of personnel (MAN). As a result, empty personnel containment means (ST _FR )
N) is correctly detected, and the possibility of false detection and omission of detection is greatly reduced.

By the way, the detection of the personnel "with" from the personnel storage means (ST _FR ) to "without" can be detected by the reverse logic of the above-mentioned "absence" to "absence" detection logic. Personnel (MAN) often exercise and personnel “yes”
Even in the state, the electric signal (R1a) generated by the electrostatic capacitance detecting means (2) may show a change (decrease in electrostatic capacitance) exceeding the predetermined value (C1) within a predetermined time (0.1 sec).

Therefore, in the preferred embodiment of the present invention (section (2) above),
The comparison processing means (1 / Fig. 4a) uses the difference (R1c = R1b-R1).
The reference value (Ref1) is set to a value corresponding to the electric signal (R1a) generated by the capacitance detecting means (2) before a) exceeds the predetermined value (C1); M1 = 1)
When the content of the electric signal (R1a) generated by the capacitance detecting means (2) becomes equal to or less than the reference value (Ref1) after the occurrence of, the electric signal (M1 = 0) indicating that there is no personnel is generated. According to this, the reference value (Ref1) is the personnel (MAN) "none"
Just before the determination is switched from to “present”, that is, the value is substantially in accordance with the electric signal (R1a) at the time of “person” (MAN) “absent”, the personnel (MAN) of the staff accommodation means (ST _FR ) The possibility of erroneously detecting an exercise that does not leave the place as “none” is reduced.

Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.

〔Example〕

FIG. 1a shows a vehicle driver seat according to an embodiment of the present invention.
Shows an occupant detection device that detects the presence or absence of occupant MAN in ST _FR . Referring to FIG. 1a, this device is composed of a microcomputer (hereinafter referred to as MUP) 1, an occupant detection circuit 2, a 0.1 second timer 3, a detection electrode EL _FR and a so-called body earth such as a roof Rf and a floor Flor of the vehicle. There is. MPU1 is
It also serves as the control device of the window regulator device not shown in FIG. 1a.

First, the structure will be described with reference to the partially crushed perspective view of the sheet ST _FR shown in FIG. 2a. The seat ST _FR is
It consists of a seat cushion 20, a seat back 22, and a headrest 24.Since both sides of the seat cushion 20 are side supports 23 that hold the waist of the occupant, and both sides of the seat back 22 are side supports 23 that hold the upper body of the occupant. ing.

Seat cushion 20 is seat cushion frame 34
The seat cushion spring 33 is set on the seat cushion pad 33, the seat cushion pad 31 is placed on the seat cushion spring support 32, and the seat cushion trim cover 30 is placed over the seat cushion pad 31. In the seat back 22, a seat back spring 43 is set on a seat back frame 44, a seat back pad 41 is placed on the seat back pad support 42 via the seat back pad support 42, and a seat back trim cover 40 is further laid up. It has become.

The structure of the seat cushion trim cover 30 is shown in FIG. 2b. Referring to FIG. 2b, the seat cushion trim cover 30 includes a skin 50, a wadding 51, and a wadding cover.
52 is formed into a single sheet. In the present embodiment, as shown by hatching in FIG. 2b, the conductive voltage is sputtered on the contact surface of the wadding 51 with the back surface of the skin 50 to form the detection voltage EL _FR ( Modifications such as sandwiching a metal foil or a conductive fiber woven cloth, or making the wadding cover 52 a conductive fiber woven cloth are conceivable, which are all possible). Since the wadding 51, the wadding cover 52, and the seat cushion pad 31 are insulators (for example, foamed polyurethane), this detection electrode EL _FR
Is isolated from the body ground and the detection voltage EL
_{The FR} and body ground form a variable capacitance capacitor whose capacitance changes with and without the passenger MAN (Fig. 1a). This can be equivalently expressed as a variable capacitor C _FR as shown in FIG. 1b.

The occupant detection circuit 2 will be described with reference to FIG. 1a again. OSC
Is an external capacitor, that is, an oscillator that generates an electric signal of a frequency according to the capacitance of the variable capacitance capacitor C _FR shown in FIG. When the capacitance of the capacitor C _FR increases, a low frequency signal is generated, and when it decreases, a high frequency signal is generated. Output of oscillator OSC is 16-bit counter CTR
Applied to.

The counter CTR counts the rising edge of the OSC output signal,
The 16-bit parallel output terminal is connected to the 16-bit parallel input terminal of the parallel-in-serial-out shift register (P / S register) PSR. The reset input terminal Rst of the counter CTR is connected to the output port P5 of MPU1.

The clock input terminal of the P / S register PSR is the output port P of the MPU.
2, the clock inhibit input terminal CI is on the MPU output port P3, and the shift load input terminal SL is on the MPU output port P4.
Respectively connected to. The P / S register PSR presets 16-bit data given to the parallel input terminal to each bit at the rising edge of the shift load pulse from MPU1 applied to the shift load input terminal SL, and gives it to the clock inhibit input terminal CI. When the clock inhibit signal from the MPU1 becomes L (low) level, the preset data is serially output from the output terminal OUT to the serial input port R8 of the MPU in synchronization with the clock pulse given to the clock input terminal CLK.

The 0.1-second timer 3 outputs an interrupt request pulse every 0.1 seconds (an example), and the pulse is the external interrupt request terminal Int of MPU1.
Given to.

The schematic operation of the embodiment apparatus shown in FIG. 1a will be described with reference to FIG. In FIG. 3, the solid line shows the oscillation frequency f of the oscillator OSC, and the broken line shows the reference data Ref with time (one example). The MPU1 samples the number of pulses output from the oscillator OSC (corresponding to the oscillation frequency f of the OSC) via the counter CTR and the P / S register PSR at every 0.1 second timer 3 interrupt (that is, at 0.1 second intervals), The frequency data corresponding to the number of pulses is set, and the change amount data corresponding to the time change of the oscillation frequency f of the OSC is set by the frequency data and the old frequency data (frequency data at the time of the previous timer interrupt). . Here, when the change amount data indicates a change in the oscillation frequency f of the OSC within a predetermined range, “no occupant” is detected, and the frequency data is updated and set as the reference data Ref; Indicates that there is a decrease in the frequency f over a predetermined range (that is, the capacitance rapidly increases), "occupant present" is detected,
At the same time, the reference data Ref is fixed. That is, when "occupant present" is detected, the reference data Ref is not updated and set from the next timer interrupt, the value indicated by the reference data is compared with the value indicated by the frequency data at that time, and the frequency data is compared. When the value indicated by exceeds the value indicated by the reference data Ref (decrease in the capacitance), "no occupant" is detected.

FIG. 4a is a flowchart showing the above timer interrupt processing operation of the MPU 1. This will be described with reference to FIG. 4a.

In the timer interrupt process, first, the contents of register R1a are loaded into register R1b. The content of the register R1a is frequency data in the timer interrupt process performed one time before (that is, frequency data 0.1 seconds before: old frequency data), as will be apparent from the description that follows.

Subsequently, when a shift load pulse (SL pulse) is output to the shift load input terminal of the P / S register PSR, the register PSR outputs 16-bit data from the counter CTR provided to the parallel input terminal for each bit. To preset.

After that, a reset pulse is applied to the reset input terminal Rst of the counter CTR to reset the CTR. That is, the counter CTR counts the number of pulses generated by the oscillator OSC from the generation of a timer interrupt to the generation of the next timer interrupt.

By giving L level (low level) to the clock inhibit input terminal CI, the P / S register PSR serially outputs the preset data from the output terminal OUT in synchronization with the clock pulse, so this output, that is, the serial input port R8 The input is read and stored in the register R1a as frequency data.

Although the register S1 will be described later, if S1 = 0 here, a value obtained by subtracting the contents of the register R1a from the contents of the register R1b is stored in the register R1c as change amount data, and the contents of the register R1a is set as reference data in the register Ref1. Then, the contents of the register R1c (change amount data) are compared with the first threshold value C1.

At this time, if the content of the register R1c is less than or equal to the first threshold value C1, the process directly returns to the main routine (not shown), but if the content of R1c exceeds the first threshold value C1, the registers M1 and S1 are set to 1 And return to the main routine (not shown) (at this time, register Ref1
Is equal to the contents of register R1a). M1 = 1 means “with crew”.

When register S1 is set to 1, the contents (reference data) of register Ref1 are not updated (fixed) in the next timer interrupt processing, and the contents of reference Ref1 (reference data) set before that and the contents of new register R1a (Frequency data)
Compare with. As a result of this comparison, when the content of the register R1a exceeds the content of the register Ref1, the registers M1 and S1 are set to 0 and the process returns to the main routine (not shown). M1 = 0 indicates “no occupant”.

Note that in the flowchart shown in FIG. 4a, S1 = 0
In the case of, as reference data, register R1a
However, the contents of the register R1b, that is, the frequency data one time before (0.1 seconds before) may be set here.

FIG. 4b is a flowchart showing a modification of the timer interrupt processing operation of the MPU 1 described above. This will be described with reference to FIG. 4b.

In the same manner as above, the current frequency data is set in the register R1a, the frequency data of the previous time (0.1 seconds before) is set in the register R1b, and the value obtained by subtracting the content of the register R1a from the content of the register R1b is registered as the variation data. Store in R1c.

If the register S1 is 0, the value of the register R1c and the second threshold C
Compare with 2. At this time, when the content (change amount data) of the register R1c exceeds the second threshold value C2, the registers M1 and S1 are set to 1 and the process returns to the main routine (not shown). M1 = 1 is "occupant" as above
Indicates.

If the content (change amount data) of the register R1c is less than or equal to the negative second threshold value −C2, the register M1 and the register S1
Is set to 0 and the process returns to the main routine (not shown). M1 = 0 means “no occupant” as described above.

That is, in this modification, the variation data is OSC.
Oscillation frequency f decreases (that is, the capacitance increases)
And the amount of change indicated by the change amount data (absolute value)
"Exists" is detected when exceeds a first predetermined value (here, the second threshold value C2); change amount data indicates an increase in the oscillation frequency f of the OSC (that is, a decrease in the capacitance), Further, when the change amount (absolute value) indicated by the change amount data exceeds the second predetermined value (here, the second threshold value C2), "no occupant" is detected.

Various modifications are conceivable by modifying the timer interrupt processing of the flowcharts shown in FIGS. 4a and 4b, or by modifying the comparison formulas in these timer interrupt processings. The idea is "to detect the presence or absence of personnel depending on the amount of time change of the electrostatic capacitance between the first electrode and the second electrode", and there is no essential difference.

FIG. 5 shows a window regulator device of a vehicle to which the occupant detection device shown in FIG. 1a is applied. In this,
For elements that have the same or equivalent effects as in Figure 1a,
The same reference numerals as in FIG. 1a are attached.

Referring to FIG. 5, this device is mainly composed of a microcomputer (MPU) 1, an occupant detection circuit 2, a 0.1 second timer 3,
The input switch circuit 4, the current detection circuit 5, the drive circuit 6, the power supply circuit 7, and the motors M _FR , M _FL , M _RR , and M _RL are mainly configured.

The power supply circuit 7 is connected to an on-board battery (+ B) and supplies a predetermined constant voltage to each constituent element.

The motors M _FR , M _FL , M _RR, and M _RL are provided in the lifting mechanism for the driver seat window, the passenger seat window, the driver rear seat window, and the passenger seat rear seat window, respectively.

FIG. 6a shows a front view of the electric window raising / lowering mechanism for opening / closing the window glass 11 of the driver seat door DOR _FR as seen from the inside of the vehicle. The window lifter mechanism is called a non-parallel type, pin one end of which is pivotally connected to the fixed portion, the lift arm 12 ₂ the pin at the other end is coupled to the lower guide rail is fixed to the window glass 11,
A pin at one end is connected to an upper guide rail fixed to the fixed portion, and a pin at the other end is connected to a lower guide rail (rearward of the sector gear 13 in FIG. 6a) fixed to the window glass 11. Equalizer arm 12 ₁ , fan gear 13 connected to lift arm 12 ₂ via a link mechanism, worm
It mainly consists of the wheel assembly 14 and the motor M _FR .

Sector gear 13, worm wheel assembly 14 and motor M _FR
The combination of is shown in Figure 6b. The sector gear 13 meshes with the wheel of the worm wheel assembly 14, and the rotating shaft of the motor M _FR is coupled to the worm meshing with the wheel.

When the motor M _FR rotates forward, this rotation causes the sector gear 13 to rotate clockwise through the worm wheel assembly 14 in FIG. 6a, pushing the glass 11 upward (window closing). motor
When the M _FR rotates in the reverse direction, this rotation causes the sector gear 13 to rotate counterclockwise in FIG. 6a via the worm wheel assembly 14 to lower the glass 11 (open the window).

FIG. 6c shows a sectional view taken along the line VI C-VI C of FIG. 6a. As shown in the figure, in the upper hollow part of the door frame 10, the window glass
11 limit switches MS _FR for fully closed position detection are provided. Knob of the switch MS _FR protrudes into the weather strip 15 side from the door frame 10, the switch MS _FR
Is off when the window glass 11 is below the fully closed position, but when the window glass 11 is at the fully closed position, the weather strip 15 is pushed up and turned on.

Although only the window lifting mechanism of the driver door DOR _FR is illustrated here, the other doors have the same structure.

Referring again to FIG.

Limit switch MS for detecting the fully closed position of the window glass 11
_FR and limit switches M _FL , M _RR , and M for detecting the fully closed position of the window glass of passenger seats, driver rear seats, and passenger rear seats, which act in the same manner as _FR
RL (not shown) is connected to the input switch circuit 4. In addition to this, the circuit 4 includes a switch for instructing window up / down of each door, a switch for detecting opening / closing of each door, a switch for detecting lock / unlock of each door lock mechanism, and detection of presence / absence of ignition key attachment. Switch (IG key switch) etc. are connected. The input switch circuit 4 has been described in detail in Japanese Patent Application No. 60-286544, so its explanation is omitted here.

The relay driver of the drive circuit 9 is connected to the output ports O _{0 to} O ₇ of the MPU 1. The relay driver is composed of an inverter and a switching transistor, etc. When each output port becomes L level (0), it is inverted by the inverter to conduct the switching transistor and energize the relays RY1 to RY8 connected thereto. .

When the relays RY2, RY4, RY6 and RY8 are energized, the relay contacts ry2, ry4, ry6 and ry8 are closed and the corresponding motor M _FR ,
Connect the lower terminals of M _FL , M _RR, and M _RL (meaning the lower terminals in FIG. 5) to the + B power supply line to energize each motor in the forward direction. The arrow UP indicates the direction of current flow at this time.

When the relays RY1, RY3, RY5 and RY7 are energized, the relay contacts ry1, ry3, ry5 and ry7 are closed and the corresponding motor M _FR ,
The upper terminals of M _FL , M _RR, and M _RL (meaning the upper terminal in FIG. 5) are connected to the + B power supply line to energize each motor in reverse. The arrow DOWN indicates the direction of current flow at this time.

A resistor r and a current detection circuit 5 are connected to the ground lines of the motors M _FR , M _FL , M _RR and M _RL of each window lifting mechanism. As is well known, since the motor current is proportional to the motor load, the motor currents of the motors M _FR , M _FL , M _RR and M _RL are detected as the voltage across the terminals of the resistor r, and the pinching abnormality (window closing) is detected. Occasionally, an in-vehicle article or the like is overloaded when it is sandwiched between the window glass and the frame) or the fully opened position of the window glass (overloaded because it is impossible to drive the window further) is detected.

The detection circuit 2 has four sets of circuits equivalent to the occupant detection circuit 2 shown in FIG. 1a, that is, four sets of oscillators (OSC) and counters (C).
TR) and P / S register (PSR). Each oscillator has a detection electrode EL _FR mounted on the driver seat (ST _FR ) and a detection electrode EL mounted on the passenger seat. _FL , the detection electrode EL _RR mounted on the driver's rear seat and the detection electrode EL _RL mounted on the passenger's rear seat are connected. The output terminal (OUT) of each P / S register is connected to the serial input ports R8, R9, R10 and R11 of MPU1 respectively, and the CLK input terminal, CI input terminal and SL input terminal of each P / S register are Each is connected in parallel to the output ports P2, P3 and P4 of MPU1, and the reset input terminal Rst of each counter is MPU in parallel.
1 is connected to output port P5.

FIG. 7a shows a flow chart showing the raising / lowering control operation of each window glass of the MPU 1, and FIG. 7b shows a flow chart showing a timer interrupt process for detecting the presence / absence of an occupant at each seat.
This will be described with reference to FIGS. 7a and 7b. In the following description, "S-" indicates a step number (S is omitted in the flowchart of Fig. 7a).

Briefly speaking, the MPU1 controls the movement of each window glass up and down according to the operation of each window glass up / down instruction switch while the passenger is on board, and when the operation of the vehicle ends and all the passengers in the vehicle disappear. , Fully control the window glass that you forget to close.

When the device shown in FIG. 5 is powered on (connected to the on-board battery), S1 is initialized and the timer 3 of S2 is started. When the timer 3 makes an interrupt request every 0.1 seconds, the timer interrupt processing shown in FIG. 7b is executed.

The timer interrupt process will be described with reference to the flowchart of FIG. 7b. This timer interrupt process is the same as the previous timer interrupt process described with reference to the flowchart shown in FIG. 4a, and is used to detect whether a driver seat, a passenger seat, a driver rear seat, or a passenger rear seat is occupant present. It is an extension of.

In timer interrupt processing, first register R1a, R2a, R3a and R
Write the contents of 4a to registers R1b, R2b, R3b and R4b. The contents of the registers R1a, R2a, R3a, and R4a are the same as those described above in the driver seat in the timer interrupt process one time before,
Frequency data corresponding to the passenger seat, the driver rear seat, and the passenger rear seat (that is, the frequency data 0.1 second before).

Next, output a shift load pulse (SL pulse) to the shift load input terminal of each P / S register, apply a reset pulse to the reset input terminal Rst of each counter, and then input the clock inhibit input of each P / S register. Terminal CI
Is input to each of the serial input ports R8, R9, R10 and R11 and stored as frequency data in the registers R1a, R2a, R3a and R4a.

If the register S1 is not 1, the content of the register R1a is subtracted from the content of the register R1b to obtain the change amount data in the register R.
After storing the contents of the register R1a as reference data in the register Ref1, the contents of the register R1c (change amount data) are compared with the first threshold value C1.

At this time, if the content of R1c exceeds the first threshold C1,
The registers M1 and S1 are set to 1 (the contents of the register R1a and the contents of the register Ref1 at this time are equal).

When register S1 is set to 1, the contents (reference data) of register Ref1 are not updated (fixed) in the next timer interrupt processing, and the contents of reference Ref1 (reference data) set before that and the contents of new register R1a (Frequency data)
Compare with. By this comparison, when the content of the register R1a exceeds the content of the register Ref1, the registers M1 and S1 are set to 0.

M1 = 1 indicates "there is a driver seat occupant", and M1 = 0 indicates "there is no driver seat occupant".

Similarly, register M2 (M2 = 1 indicates "passenger seat occupancy", M2 = 0 indicates "passenger seat occupancy"), and driver rear seat occupant. Register M3 indicating presence / absence (M3 = 1 indicates “with driver rear seat occupant”, M3 = 0 indicates “without driver rear seat occupant”) and register M4 indicating presence / absence of passenger rear seat (M4) = 1 indicates "there is a passenger behind the passenger," and M4 = 0 indicates "no passenger behind the passenger."

Referring again to FIG. 7a, in S2, the input switch circuit 4
Read the status of each switch.

If the IG key switch is turned on in S3, the process proceeds to S7 and S8, and the elevation control of each window glass is performed according to the switch operation. This elevation control is described in detail in Japanese Patent Application No. 60-286544, so please refer to it. In this case, when the window glass of the driver's door is fully closed, the "FR fully closed" flag is set, and when the window glass of the passenger door is fully closed, "FL fully closed" is displayed.
"Fully closed" flag, "RR fully closed" flag when the window glass of the driver rear seat door is fully closed, and "RL fully closed" flag when the passenger rear door window glass is fully closed,
Set each.

The driver and his passenger remove the ignition key (switch off the IG key), get off the vehicle, lock all doors and close all doors to finish using the vehicle and leave the vehicle. Therefore, go to S3 → S4 → S5 → S6
If M1, M2, M3 and M4 are all 0 (that is, no occupant), proceed to S9.

In S9, the presence or absence of the "FR fully closed" flag is checked. This "FR
If there is a "fully closed" flag, the window glass of the driver's door is already in a fully closed state, so proceed to S13, but if this "FR fully closed" flag is not present, the window glass is not yet in a fully closed state. , Check the state of the switch MS _FR at S10.
Since the window glass of the driver's door is not fully closed, the switch MS _FR is naturally off, and the output port O _{0 is set} to 1 at S11.
(H), the output port O ₁ is set to 0 (L), and the motor M _FR is biased in the forward direction to close and drive the window glass.

After this, S11-S13 -... S-17 -...- S21 -...
-S2-S3-S4-S5-S6-S9-S10-S11-S13 -...
.. In this loop, when the window glass of the driver's seat door is fully closed, the switch MS _FR is turned on, so S10 to S12
And output ports O ₀ and O ₁ are both set to 1 (H).
To deactivate the motor M _FR and set the "FR fully closed" flag. After setting the "FR fully closed" flag, S9 to S13
Proceed to.

In S13, the presence or absence of the "FL fully closed" flag is checked. This "F
If there is the "L fully closed" flag, the window glass of the passenger door is already fully closed, so proceed to S17, but this "FL fully closed"
If there is no flag, the window glass is not yet in the fully closed state, so the state of the switch MS _FL is checked in S14. The window of the passenger door is not completely closed, so of course the switch MS
_{The FL} is off, and the output port O _{2 is set} to 1 (H) and the output port O ₃ is set to 0 (L) in S15 to bias the motor M _FL in the forward direction to close and drive the window glass.

After this, S15-S17 -...- S21 -...- S2-S3-S4
-S5-S6-S9 -...- S13-S14-S15-S17 -...
・ In the loop, when the window glass FL window of the passenger door is fully closed, the switch MS _FL is turned on, so the process proceeds from S14 to S16, where both output ports O ₂ and O ₃ are set to 1 (H). To deactivate the motor M _FL and set the “FL fully closed” flag. After setting the "FL fully closed" flag, the process proceeds from S13 to S17.

In S17, the presence or absence of the "RR fully closed" flag is checked. This "R
If there is an "R fully closed" flag, the window glass of the driver's rear seat door is already fully closed, so proceed to S21.
If the "R fully closed" flag is not present, the window glass is not yet in the fully closed state, so the state of the switch MS _RR is checked in S18. Since the window glass of the driver's rear seat door is not fully closed, the switch MS _RR is naturally off, and the output port O
_{4 is set} to 1 (H) and the output port O ₅ is set to 0 (L), and the motor M _RR is forwardly biased to close and drive the window glass.

After this, S19-S21 -...- S2-S3-S4-S5-S6-S9-
...- S13 -...- S17-S18-S19-S21 -...
・ In the loop, when the window glass of the driver's rear seat door is fully closed, the switch MS _RR is turned on.
Proceed to step 20 and set both output ports O ₄ and O ₅ to 1 (H).
To deactivate the motor M _RR and set the "RR fully closed" flag. After the "RR fully closed" flag is set, S17 to S21
Proceed to.

In S21, the presence or absence of the "RL fully closed" flag is checked. This "R
If there is the "L fully closed" flag, the window glass of the passenger rear seat door is already in the fully closed state, so the process returns to S3, but if this "RL fully closed" flag is not present, the window glass is still in the fully closed state. If not, the state of the switch MS _RL is checked in S22.
Since the window glass of the passenger rear seat door is not fully closed, the switch MS _RL is naturally off, and the output port O _{6 is set} to 1 at S23.
(H) and the output port O ₇ are set to 0 (L) respectively, and the motor M _RL is biased in the forward direction to close and drive the window glass.

After this, S23-S2-S3-S4-S5-S6-S9 -...- S13-
...- S17 -...- S21-S22-S23-S2 --...
・ In the loop, when the window glass of the passenger rear seat door is fully closed, the switch MS _RL is turned on, so the process proceeds from S22 to S24, where both output ports O ₆ and O ₇ are set to 1 (H). Set it to deactivate the motor M _RL and set the "RL fully closed" flag. After setting the "RL fully closed" flag, the process proceeds from S21 to S3.

As described above, the MPU 1 controls the lifting and lowering of each window glass of the vehicle.

In the above embodiment, the detection electrodes EL _FR , EL _FL , EL _RR, and EL _RL are mounted on the driver seat, the passenger seat, the driver rear seat, and the passenger rear seat, but it is not limited to this. I have no intention of doing it.

For example, Figure 8a shows the detection electrode on the armrest of the driver's seat.
A modified example of mounting the EL _FR is shown. The armrest of this example is a molded skin CVa with insert INS attached and urethane foam PAa is injected and foamed, but inside the skin CVa, sputtering of conductive paint (conductive fiber woven cloth, metal foil) is used. However, the detection electrode EL _FR is formed. Further, FIG. 8b shows a modification in which the detection electrode EL _{FR is} attached to the door trim of the driver seat door DOR _FR . In the door trim of this example, a detection electrode EL _FR made of a metal foil (a sputter of conductive paint or a conductive fiber woven cloth may be used) is mounted between the trim board BDt and the trim cover CVt. In addition,
Figure 8c shows a modification in which the detection electrode EL _FR is mounted on the floor mat of the driver's seat. In the floor mat of this example, a detection electrode EL _FR made of a metal foil (sputtering conductive paint or woven conductive fiber cloth) is mounted between two rubber plates.
In this way, various modifications are possible.

Next, a second embodiment of the present invention will be described. FIG. 10a is a side view showing the seat 100 installed in the theater. The seat 100 includes a seat cushion portion 110 and a seat back portion.
120 is connected by a hoisting mechanism 130.

The hoisting mechanism 130 is shown in Figure 10b. Referring to FIG. 10b, the flip-up mechanism 130 is the frame of the seat cushion 110.
A lift arm 132 connected to 111 and a driven gear fixed to the seat back portion are pivotally attached by a hinge 131. A motor 133 is fixed to the lift arm 132, a drive gear (not shown) is fixed to a rotation shaft of the motor 133, and the drive gear meshes with a driven gear 134. That is, when the motor 133 is biased, the lift arm 132 rotates clockwise in the drawing, and the seat cushion portion 110 jumps up. Driven gear 1
The lower arm 34 is provided with a lower stopper 135 and an upper stopper 136 to restrict the rotation of the lift arm 132. In addition,
When the lift arm 132 contacts the upper stopper 136, the limit switch SWx (not shown) is turned on. A first detection electrode 140 of a conductive fiber woven cloth (a metal foil or a conductive paint may be sputtered) is attached to the surface of the seat cushion portion 110, and a metal foil (a conductive woven cloth, A second detection electrode 150 made of a conductive paint sputter) may be provided.

FIG. 9 shows the configuration of a personnel detection device for the seat 100 and a seat control device to which the device is applied. Here, the same reference numerals are used for elements having the same or equivalent actions as those in FIG. 1a described above. The first detection electrode 140 attached to the seat 100 and the second detection electrode 150 laid on the floor are
It is connected to the oscillator OSC of the personnel detection circuit 2. here,
Although an oscillator based on a C-MOS IC is used as the cooler OSC, it operates in the same manner as the oscillator OSC shown in FIG. 1a. Counter CTR, P / S register PSR and 0.1 second timer 3
Since the operation of is as described above, description thereof will be omitted here.

The limit switch SWx is connected to the input port RX of the MPU1, and the motor driver of the motor 133 is connected to the output port Oa.

MPU1 is roughly, when there is no seat on the seat 100,
The motor 133 of the hoisting mechanism 130 is urged to hoist the seat cushion portion 110 to release the passage. MPU1 shown in Fig. 11
This will be described more specifically with reference to the operation flowchart of FIG.

When the power is turned on, initialization is performed and the timer 3 is started. The timer 3 issues an interrupt request every 0.1 seconds as described above, whereby the MPU 1 executes the timer interrupt process shown in the flowchart of FIG. 4a (or the flowchart of FIG. 4b). This timer interrupt process is as described above, and therefore its explanation is omitted here.

If the limit switch SWx is on, the seat cushion portion 110 has already been jumped up, so a standby loop is formed and the process does not proceed beyond that. If not, the register M1 is checked. If there are people in seat 100,
Since the register M1 is set to 1 in the timer interrupt process, a loop is formed to set the use state, but if not, counting of the number of clocks by the register Rx is started. This register Rx functions as an internal timer and extends the loop in use for a predetermined time. That is, after the personnel stand up from the seat 100, the seat cushion portion 110 is jumped up with some time left.

When the register Rx overflows, the motor 133 is energized to clear the flag Sx indicating that the registers Rx and RX are counting.

After that, while monitoring the status of the limit switch SWx and the register M1, the seat cushion part is jumped up and driven,
When the limit switch is turned on, the jumping is completed, so the motor 133 is de-energized, or if the register M1 becomes 1 before the limit switch SWx is turned on, it means that another person is seated and the motor 133 is turned on. Deactivate and return to the waiting loop.

In the second embodiment described above, the personnel detection of a single theater seat has been described. However, if the apparatus shown in FIG. It will be obvious that individual personnel detection (in general sheets) is possible.

Finally, a third embodiment of the present invention will be described with reference to FIG. Referring to FIG. 12, this device shows an oscillator OSC (first
It uses the same IC555 as the OSC shown in Fig. a), F / V converter (frequency / voltage converter) FV, sample and hold circuit SH,
It is composed of a comparison processing circuit CMP and a sampling control circuit CON.

The detection electrode EL _FR shown in FIG. 1a is connected to the oscillator OSC and outputs an electric signal having a frequency corresponding to the electrostatic capacitance between the EL _FR and the body ground.

The signal a having a voltage corresponding to the outputs of the F / V converters FV and OSC is output. Output of FV is sample hold circuit SH, comparison processing circuit C
It is given to MP and sampling control circuit CON.

The sample hold circuit SH holds the input (that is, the FV output) when the sampling pulse h arrives until the next sampling pulse h arrives, and supplies it as the voltage signal b to the comparison processing circuit CMP and the sampling control circuit CON.

The comparison processing circuit CMP includes a differential amplifier AMP and a comparator.
It consists of CP1. The differential amplifier AMP outputs a value obtained by subtracting the voltage applied to the “−” terminal from the voltage applied to the “+” terminal, that is, a voltage signal c corresponding to “ba” at the output terminal OUT.
Output more. This voltage signal c is given to the "+" terminal of the comparator CP1. On the other hand, the voltage signal d corresponding to the first threshold value C1 (see FIG. 4b) is applied to the “−” terminal of the comparator CP1, and when the voltage signal c becomes equal to or higher than the voltage signal d, the detection signal e is output. L level (no personnel)
To H level (with personnel). The detection signal e is the processor and sampling control circuit CO of the master unit not shown.
Given to N.

The sampling control circuit CON comprises a pulse generator PGEN, two flip-flops FF1 and FF2, two AND gates AN1 and AN2, and a comparator CP2. The detection signal e is the set input terminal S of the flip-flop FF1 and the reset input terminal R of the flip-flop FF2.
Applied to. The detection signal e of the flip-flop FF1 is L
When the level shifts from the H level to the H level, the output terminal Q is triggered at the rising edge to set the H level (set), and the flip-flop FF2 is triggered at the same rising edge to set the output terminal Q to the L level (reset).

The Q output of the flip-flop FF1 is given to the 1 input terminal of the AND gate AN2, and the Q output of the flip-flop FF2 is given to the 1 input terminal of the AND gate AN2 as the pulse control signal f. The output pulse g of the pulse generator PGEN is applied to the other input terminal of the AND gate AN2.

In other words, when the CMP detects "there is a person", the pulse control signal f blocks the output pulse g of the PGEN in AN2, so that the sampling pulse h disappears and the sample hold circuit SH holds the voltage signal b at that time.

After that, when the output voltage signal a of the F / V converter FV becomes larger than the voltage signal b held by the sample hold circuit SH, the detection signal e becomes H level, but at the same time, the comparator CP2 of the sampling control circuit CON Outputs H level. This output is given to the set input terminal S of FF2 via the AND gate AN1 because the Q output of the flip-flop FF1 is at H level, and at the rising edge of the flip-flop FF,
Set 2. That is, since the pulse control signal f becomes H level, the AN2 outputs the output pulse g of PGEN again as the sampling pulse h, whereby the sample hold circuit SH restarts the updating of the sampling voltage b. Also, the flip-flop FF1 is reset at the rising edge of the CP2 output.

As in the third embodiment described above, the present invention can be realized by an analog circuit.

〔The invention's effect〕

When the presence or absence of a person is detected by detecting the change in the capacitance (C _FR ) of the first electrode (EL _FR ) and the second electrode (Flor), the capacitance ( C
_The rate of change of _FR ) is relatively small and the rate of change is low, but the rate of change when the staff accommodation means (ST _FR ) changes from “without” to “with” the personnel (MAN) is relatively large. Is high.

In the present invention, paying attention to this, the memory updating means (1 / Fig. 4a)
However, the electric signal (R1
a) is updated and stored in the storage means (R1b) at a predetermined cycle (0.1 sec), and the comparison processing means (1 / Fig. 4a) causes the electric signal (R1a) generated by the capacitance detection means (2). Between the contents of the signal and the contents of the signal held by the storage means (R1b) (R1c = R1b-R1a)
When the value exceeds the specified value (C1), an electric signal (M1 = 1) indicating the presence of personnel is generated, so the specified time (0.1s
If the electric signal (R1a) generated by the electrostatic capacitance detection means (2) shows a change (increase in electrostatic capacitance) exceeding a predetermined value (C1) within ec), the comparison processing means (1 / 4a in FIG. 4). ) Is personnel (MA
N) Generates an electric signal (M1 = 1) indicating the presence. Therefore, the fact that the empty personnel accommodation means (ST _FR ) accommodated the personnel (MAN) is accurately detected, and the possibility of false detection and omission of detection is greatly reduced.

[Brief description of drawings]

FIG. 1a is a block diagram showing the configuration of the first embodiment of the present invention,
FIG. 1b shows the detection electrode E connected to the oscillator OSC shown in FIG. 1a.
FIG. 3 is a block diagram equivalently showing L _FR and body ground. Fig. 2a is a partially broken perspective view of the driver seat ST _FR , Fig. 2b
The figure is a perspective view showing the structure of the seat cushion trim cover 30 shown in FIG. 2a. FIG. 3 is a graph showing changes over time in the oscillation frequency f of the oscillator OSC shown in FIG. 1a and the reference data Ref. FIG. 4a is a flowchart showing a timer interrupt process of the microcomputer 1 shown in FIG. 1a or FIG. 9, and FIG. 4b is a flowchart showing a modification thereof. FIG. 5 is a block diagram showing the configuration of a window regulator device to which the device of the first embodiment shown in FIG. 1a is applied. FIG. 6a is a front view showing the structure of the window glass lifting mechanism at the driver's seat of the vehicle, and FIG. 6b is the fan gear 13 of FIG.
FIG. 7 is a partially enlarged view showing a combination of the wheel assembly 14 and the motor M _FR . FIG. 6c is a sectional view taken along line VI C-VI C of FIG. 6a. FIG. 7a is a flow chart showing a schematic control operation of the microcomputer 1 shown in FIG. 5, and FIG. 7b is a flow chart showing a timer interrupt processing operation of the microcomputer 1. FIG. 8a is a modification in which the detection electrode EL _FR shown in FIG. 1a is mounted on the armrest, FIG. 8b is a modification in which the detection electrode EL _FR is mounted on a door trim, and FIG. 8c is the detection electrode EL _FR. It is a partial crushing perspective view which each shows the modification which equips a floor mat with. FIG. 9 is a block diagram showing the configuration of the second embodiment of the present invention. FIG. 10a is a side view showing the theater seat 100, and FIG. 10b is the first view.
It is a side view which shows the structure of the flip-up mechanism 130 of FIG. 0a. FIG. 11 is a flow chart showing the control operation of the microcomputer 1 shown in FIG. FIG. 12 is a block diagram showing a schematic configuration of the third embodiment of the present invention. 1: Microcomputer (storage means, comparison processing means, reference value setting means) 2: Occupant detection circuit, personnel detection circuit (electrostatic capacitance detection means) 3: 0.1 second timer 1,3: (memory update means) 4: Input Switch circuit 5: Current detection circuit, 7: Power supply circuit 10: Door frame, 11: Window glass 12 ₁ : Equalizer arm 12 ₂ : Lift arm, 13: Fan gear 14: Worm wheel assembly 15: Weather strip 20: Seat Cushion 21: Cyclic support, 22: Seat back 23: Side support 24: Headrest, 30,40: Trim cover 31,41: Pad, 32,42: Pad support 33,43: Spring, 34,44: Frame 100: Theater Seat (personnel accommodation means) 110: Seat cushion section 111: Frame, 120: Seat back section 130: Jumping mechanism, 131: Hinge 132: Lift arm, 133: Motor 134: Driven gear, 135, 136: Stopper 140: First detection Electrode (first electrode) 150: Second detection Pole (second electrode) ST _FR: driver's seat (personnel containing means) EL _FR: detection electrodes (first electrode) Rf: Roof, Flor: floor Rf, Flor :( second electrode, body earth) OSC: Oscillator ( Oscillation means) CTR: Counter MAN: Personnel PSR: Parallel in / serial out shift register M _FR , M _FL , M _RR , M _RL : Motor RY1, RY2, RY3, RY4, RY5, RY6, RY7, RY8: Relay ry1ry2 , ry3, ry4, ry5, ry6, ry7, ry8: Relay contact r: Resistor DOR _FR : Driver seat MS _FR : Limit switch CVa: Skin, INS: Insert PAa: Urethane foam BDt: Trim board CVt: Trim cover FV : F / V converter (frequency / voltage converter) OSC, FV: (electrostatic capacitance detection means) SH: Sample and hold circuit (storage means, sampling voltage holding means) CMP: Comparison processing circuit (comparison processing means) CON: Sampling control circuit (memory updating means, sampling signal generating means) AMP: Differential amplifier PGEN: Pulse generator CP 1, CP2: Comparator AN1, AN2: AND gate FF1, FF2: Flip-flop AN1, FF2: (blocking means)

Claims (23)

[Claims] 1. A personnel accommodating means; a first electrode and a second electrode insulated from each other for forming an electric field with at least a part of the personnel accommodated in the personnel accommodating means interposed therebetween; a first electrode and a second electrode. Capacitance detecting means for generating an electric signal corresponding to the electrostatic capacitance between the electric signal and the storage means; storage means for holding the electric signal; storage updating means for updating and storing the electric signal in the storage means at a predetermined cycle; and A personnel detection device comprising: a comparison processing means for generating an electrical signal indicating the presence of personnel when the difference between the content of the electric signal generated by the capacitance detection means and the content of the signal held by the storage means exceeds a predetermined value. . 2. The comparison processing means sets a value corresponding to an electric signal generated by the electrostatic capacitance detection means before the difference exceeds the predetermined value as a reference value; and an electric signal indicating the presence of personnel is generated. The personnel detecting device according to claim (1), wherein when the content of the electric signal generated by the capacitance detecting means becomes below the reference value later, an electric signal indicating that there is no personnel is generated. 3. The personnel detection device according to claim 2, wherein the comparison processing means has a holding means for holding the content of the electric signal indicating whether or not there is a staff member. 4. The personnel detection device according to claim 3, wherein the comparison processing means holds the reference value while the holding means holds a signal indicating that there is a staff member. 5. The comparison processing means is configured so that the difference between the content of the electric signal generated by the capacitance detection means and the content of the signal held by the storage means indicates the capacitance between the first electrode and the second electrode. When the difference is increased and exceeds the first predetermined value, an electric signal indicating the presence of personnel is generated; the electric signal generated by the capacitance detecting means and the signal held by the storage means are stored. The personnel detection device according to claim (1), wherein a difference indicates a decrease in the capacitance, and when the difference is less than a second predetermined value, an electric signal indicating no personnel is generated. 6. The personnel detection device according to claim 5, wherein the comparison processing means has a holding means for holding the content of the electric signal indicating the presence or absence of the personnel. 7. The electrostatic capacitance detecting means includes an oscillating means for generating a signal having a frequency according to the electrostatic capacitance between the first electrode and the second electrode. Personnel detection device. 8. The personnel detecting device according to claim 7, wherein the oscillation frequency of the electric signal generated by the oscillating means decreases as the capacitance increases. 9. The electric signal generated by the capacitance detecting means is:
The personnel detection device according to claim (8), which is frequency data indicating a numerical value corresponding to a frequency generated by the oscillating means. 10. The personnel detecting device according to claim 8, wherein the capacitance detecting means includes a frequency / voltage converter. 11. The personnel detecting device according to claim 8, wherein the electric signal generated by the capacitance detecting means is a voltage signal corresponding to the frequency generated by the oscillating means. 12. The personnel detection device according to claim 11, wherein the storage means is a sampling voltage holding means. 13. The memory updating means is a sampling signal generating means for generating a sampling signal for instructing the sampling voltage holding means to sample the voltage, and when the comparison processing means generates an electric signal indicating the presence of personnel, the sampling signal The personnel detection device according to claim (12), further comprising a blocking means for blocking the occurrence. 14. The personnel detecting device according to claim 1, wherein the personnel accommodating means is a vehicle seat. 15. The personnel detection device according to claim 14, wherein the first electrode is a conductive layer having a wide surface to be mounted on the seat; and the second electrode is a vehicle body. 16. The personnel detecting device according to claim 14, wherein the first electrode is a conductive layer having a wide surface to be mounted on a vehicle door trim; and the second electrode is a vehicle body. . 17. The personnel detection device according to claim 14, wherein the first electrode is a conductive layer attached to an armrest of a vehicle; and the second electrode is a body of the vehicle. 18. The personnel detection according to claim 14, wherein the first electrode is a conductive layer having a wide surface to be mounted on a floor mat of a vehicle; and the second electrode is a vehicle body. apparatus. 19. The conductive layer is a thin film conductor such as a metal foil, a woven fabric of conductive fibers, or a conductive paint layer adhered to a film or the like. Section 16),
The personnel detection device according to item (17) or (18). 20. The personnel detecting device according to claim 1, wherein the personnel accommodating means is a sheet installed in a building. 21. The first electrode is a conductive layer having a wide surface to be mounted on the sheet; and the second electrode is a conductive layer laid on a floor surface. Personnel detection device. 22. The conductive layer forming the first electrode is a flexible thin film conductor such as a metal foil, a woven fabric of conductive fibers, or a conductive paint layer adhered to a film. Personnel detection device according to item (20). 23. The conductive layer forming the second electrode is a thin film conductor such as a metal foil, a woven fabric made of conductive fibers, or a conductive paint layer adhered to a film. ) Personnel detection device described in the paragraph.