JPH061132B2 - Air conditioning control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention is a control device for air conditioning equipment, in which a pyroelectric infrared detection device detects a human body to operate an ultrasonic sensor, and an ultrasonic sensor detects a distance. Whether the human body is approaching by measuring
The present invention relates to a device that determines whether a vehicle stays or passes, and controls an air conditioning facility.

<Prior art> Air conditioning equipment A so-called air conditioner is conventionally controlled by a temperature sensor, and forced cooling is performed by switching on (SW / ON), and when a certain temperature set value is exceeded, sensor control is entered and the temperature sensor is set. The temperature is controlled from the upper limit to the lower limit.

<Problems to be solved by the invention> However, if you suddenly enter the room with an air conditioner from the outside, you may want to perform forced cooling or forced heating regardless of the room temperature, but automatic control can handle this. Instead, there was only a way to control manually.

<Means for Solving Problems> The present invention has been made to solve the above problems, and includes a pair of pyroelectric infrared detection elements and a mirror piece,
A pyroelectric infrared detection device in which a mirror piece is provided near the pyroelectric infrared detection device so that the reflected light from the mirror segment is projected and incident on the pyroelectric infrared detection device, and a pyroelectric infrared detection device. Oscillates a predetermined frequency for a certain period of time by detecting infrared rays, an ultrasonic sensor that emits ultrasonic waves in synchronization with the oscillation of the oscillation circuit and receives reflected waves, and the oscillation of the oscillation circuit When there are M (M ≧ 2) timers that receive signals and output for each individually determined time, and the reflected wave output of the ultrasonic sensor is input for each output of each timer M to output ON signal
It is an air-conditioning control device characterized by having a plurality of comparators and a processing circuit for controlling the air-conditioning equipment according to the states of the outputs of M comparators.

<Example> Hereinafter, the example of the air-conditioning control device of the present invention is described in detail using a drawing.

In FIG. 1 and FIG. 2, when a human body HG as a detection object that emits infrared rays enters the detection zone of the pyroelectric infrared detection device 1, the infrared detection signal is output from the FET of the pyroelectric infrared detection device 1. Is output, and the infrared detection signal is amplified by the first amplifier 2 to about several volts and input to the first comparator 3. The first comparator 3 has a first
If the threshold potential is set to a level above the bias potential of the amplifier 2 in the steady state and the infrared detection signal stably exceeds the threshold value, and the infrared detection signal exceeds the threshold potential, The processing circuit 4 instantaneously outputs a LOW signal, that is, a negative logic "1" signal.
Send to. When the processing circuit 4 receives the LOW signal from the first comparator 3, the processing circuit 4 operates the oscillation circuit 5 for a fixed time (for example, several minutes). This oscillation circuit 5 is 40K
Hz carrier for 1 msec at a constant cycle of 50 msec
And oscillate for a few minutes as described above. The oscillation signal from the oscillation circuit 5 is voltage-amplified by the second amplifier 6, and the ultrasonic sensor 7 emits the ultrasonic wave according to the oscillation signal from the oscillation circuit 5. When the ultrasonic wave hits the object to be detected, the reflected wave returns to the ultrasonic sensor 7 and the ultrasonic sensor 7
Is converted into an electric signal. The converted electric signal is amplified by the third amplifier 8, while the oscillation signal from the oscillation circuit 5 is input to the first and second timers 9 and 10 having different operation times, and the first and second timers 9 and 10 are provided. The timers 9 and 10 are, for example, 6 msec from the first timer 9 and the second timer 1 after the oscillation signal is input for a predetermined time that is individually determined.
A high signal is sent from 0 for 12 msec. Then, the outputs of the first timer 9 and the second timer 10 and the output of the third amplifier 8 are input to the second and third comparators 11 and 12. Each of the second comparator 11 and the third comparator 12 outputs an (ON) signal to the processing circuit 4 only while both inputs are present.

By the way, the distance between the ultrasonic sensor 7 and the human body HG which is the detected body is proportional to the elapsed time from the emission of the ultrasonic wave to the reception of the reflected wave. Therefore, the ultrasonic reflected wave amplified by the third amplifier 8 is determined in distance by the second and third comparators 11 and 12. Since the speed of the sound wave is about 340 m / sec, it takes about 3.0 msec to travel 1 m.
Therefore, the first timer 9 sets the delay time to about 6.0 msec, and the second timer 10 sets the delay time to about 12 msec.
And the outputs of the first and second timers 9 and 10 are used as a reference, the second comparator 11 determines the distance of about 1 m and the third comparator 12 determines the distance of about 2 m. . That is, when the distance from the human body is about 2.5 m, t =
2 × 2.5 / 340 = 14.7 msec has elapsed, and at this time, the second and third comparators 11 and 12 are turned off (O
FF) state. When the distance is about 1.5m, t = 2 × 1.5
Since /340=8.8 msec, the second comparator 11 is off, and the third comparator 12
Is turned on. Further, when the distance is about 0.7 m, the elapsed time is t = 2 × 0.7 / 340 = 4.1 msec, and the second and third comparators 11 and 12 are both turned on. In this way, the states of the second and third comparators 11 and 12 are input to the processing circuit 4 to control the air conditioner 13. Reference numeral 14 denotes a switch, which connects the output terminal of the amplifier 6 and the signal terminal of the ultrasonic sensor 7 when the oscillation signal is being output from the second amplifier 6 and which is not connected when the oscillation signal is not being output. Sound wave sensor 7
It has a function of connecting the signal terminal of and the input terminal of the amplifier 8.

The case where the control method according to the present invention and the conventional control method are used in combination will be described. The control by the conventional method is the primary control, and the control by the pyroelectric infrared detection device 1 of the present embodiment is the second control. Use the next control. First, when a person enters a room with an air conditioner whose temperature is controlled by the primary control, first the pyroelectric infrared detection device 1 detects the human body and the ultrasonic sensor 7 firstly detects the first set distance. If it enters within (about 2 m), it enters the preparation state of forced cooling or forced heating, and if it comes closer and enters within the second set distance (about 1 m), the secondary control turns on (ON) and forced cooling for a certain period of time. Or go into forced heating. Then, if the human body continues at the distance position in the preparation state, this does not require the extreme cooling and the like, and therefore the secondary control is not performed. In addition, it is determined that the state of once entering the first set distance and immediately exiting from the room has passed through the room, and does not shift to the secondary control.

Here, the pyroelectric infrared detection device 1 used in the present invention will be described in detail. FIG. 3 (a) is a plan view of the pyroelectric infrared detection device 1, and FIG. 3 (b) is IIIb-III in FIG. 3 (a).
FIG. 2 is a cross-sectional view taken along the arrow b, showing the upper surface 1 of the resin cylindrical housing 15.
6 has an opening 17 in the center, and the opening 17 is housed in a housing 15 and has a pair of pyroelectric infrared detecting elements 18a, 18
The pyroelectric infrared detection sensor 18 provided with b is arranged. On the upper surface 16 of the housing 15, there are six mirror pieces 19 which are mirror-finished.
Around the pyroelectric infrared sensor 18 at equal intervals (60
Angle) and is mounted perpendicular to the light receiving surface of the pyroelectric infrared detection sensor 18.

FIG. 4 is a circuit diagram of the pyroelectric infrared detection sensor. The pyroelectric infrared detection elements 18a and 18b are directly connected to the same polarization side, and the differential output thereof is a field effect transistor FET.
Is output from the impedance conversion circuit of the emitter follower. Note that R1 and R2 are resistors.

In this configuration, the operation when the human body moves across the extension surface of one mirror piece 19 is described with reference to the operation of FIG. 5 and the output waveform diagram of the pyroelectric infrared detection element of FIG. This will be described with reference to the FET output waveform diagram of FIG. When a human body radiating heat rays, that is, infrared rays arrives at the region (1) from a relatively distant place, the first pyroelectric infrared detecting element 18a on one side and the second pyroelectric type infrared detecting element 18a on the other side are arranged with a distance d therebetween. Infrared rays enter the pyroelectric infrared detection element 18b, but the differential output is not output to the FET. next,
In the area (2) serving as the first detection zone due to the shielding and reflection, the mirror piece 19 acts to reflect and project the infrared light to the first pyroelectric infrared detection element 18a so as to be incident. 2 pyroelectric infrared detector 18b
Infrared is blocked to obtain a large differential output. Further, when the human body reaches the area (3), the infrared rays are not affected by the mirror piece 19 and both pyroelectric infrared detection elements 18 are detected.
It is incident on a and 18b, but no differential output appears. Also,
In the region (4) as the second detection zone due to the shielding and reflection, the mirror piece 19 shields the infrared rays from the first pyroelectric infrared detecting element 18a, and the mirror piece 19 becomes the second pyroelectric infrared detecting element 18b. On the other hand, it acts to reflect infrared rays, project them, and make them incident, and obtain a large differential output. In the area (5), both pyroelectric infrared detection elements 18a, 18b
Infrared rays are incident on and no differential output appears. In the above description, the infrared rays are emitted from one point, and the infrared rays are attenuated in inverse proportion to the square of the distance. However, the actual detection object has a certain width. And its width and the first and second pyroelectric infrared detection elements 1
It should be noted that it is necessary to take into consideration the difference in distance between the objects 8a and 18b to the object to be detected.

When the human body that emits infrared rays reaches the detection zone of the pyroelectric infrared detection device, the pyroelectric infrared detection element 18a,
The infrared ray is detected by 18b, and impedance conversion is performed by the FET to obtain a differential output, which is used as an infrared detection signal.

FIG. 7 shows a second embodiment of the pyroelectric infrared detection device used in this air conditioning control device. Pyroelectric infrared detector 20
Is a pin 23 penetrating a disk-shaped bottom portion 22 forming a part of the case 21, and a substrate 26 on which an FET circuit 24 and pyroelectric infrared detection elements 25a and 25b are formed.
It is supported by and is arranged in the central portion of the case 21. Also,
The bottom portion 22 is provided with a mirror piece 27 that is perpendicular to the surface on which the pyroelectric infrared detection elements 25a and 25b are formed. Mirror piece 2
Reference numeral 7 is a rectangular member having a substantially semi-circular shape in the center of the lower side, and its extended surface has pyroelectric infrared detection elements 25a and 25b.
It is arranged so that it is located between. The surface is mirror-finished, and the infrared rays reflected by the first reflecting surface 27a are incident on the first pyroelectric infrared detecting element 25a, and the infrared rays reflected by the second reflecting surface 27b are the second focal point. It is made incident on the electric infrared detecting element 25b. Further, the pyroelectric infrared detection device 20 has a cylindrical cover 28 forming a part of the case 21, and the cover 28 has an opening 2 at the end face portion.
9 is provided, the opening 29 is covered with an optical filter 30 made of a member that transmits infrared rays, and the cover 29 is covered with the bottom 22.
Inert gas such as nitrogen gas (N ₂ ) is sealed inside and sealed by welding or the like. In this structure, the number of the mirror pieces 27 is one, but the operation is the same as that of FIG. The size is about the same as the infrared sensor of the first embodiment.

FIG. 8 is a perspective view showing a third embodiment of the pyroelectric infrared detection device used in this air conditioning control device, and is shown without the optical filter. The six mirror pieces 32 are arranged at equal intervals (60 degrees) around the pyroelectric infrared detection element.
As in the first embodiment, the interval between the mirror pieces 32 is narrowed to increase the number of detection areas, and the mirror piece 32 is made small in size as in the second embodiment, so that the pyroelectric infrared detection device has the first structure. The size is reduced to the same size as the pyroelectric infrared detection sensor of the embodiment. The operation in this configuration is similar to that of FIG.

In the description of FIG. 1, the threshold potential is above the bias potential of the first amplifier 2, but it may be below or may have two upper and lower threshold potentials. When the upper and lower thresholds are provided, it is possible to turn on the pyroelectric infrared detection device 1 at the same angle on the left and right sides or at different angles on the left and right sides.

<Effect of the Invention> The air conditioner of the present invention is as described in detail above, and produces the following effects.

The pyroelectric infrared detection device detects the human body, the ultrasonic sensor measures the distance, and the air conditioner is controlled by determining whether the human body is stationary or passing, so it is forced according to the condition of the human body. You can finely set the room temperature such as cooling and forced heating. Further, when used together with the conventional temperature control, it is not necessary to control the room temperature to the optimum temperature, so it is easy to control the room temperature, and it is possible to keep the room temperature low.
It has the advantages of being economical and saving energy.

Moreover, since the pyroelectric infrared detection device is small, it does not become large even when combined with an ultrasonic sensor, and can be attached to the control panel of an air conditioner. Furthermore, since the ultrasonic sensor is activated only when the pyroelectric infrared detection device detects infrared rays, power consumption can be reduced as compared with the system in which the ultrasonic sensor is always activated.

Furthermore, since at least two or more combinations of timers and comparators are prepared to measure the distance to the object to be detected, accurate measurement can be performed, and by increasing the number of combinations, higher accuracy can be achieved. Measurement is possible.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the device of the present invention, and FIG.
1 is an operation waveform diagram of the device of FIG. 1, FIG. 3 (a) is a plan view of a pyroelectric infrared detection device used in the device of the present invention, FIG. 3 (b) is the same sectional view, and FIG. FIG. 5 is a circuit diagram of the electric infrared detecting device, FIG. 5 is an operation explanatory diagram of the pyroelectric infrared detecting device, and FIG. 6A is a waveform diagram of the pyroelectric infrared detecting element.
6 (b) is a FET output waveform diagram, FIG. 7 (a) is a front sectional view of a pyroelectric infrared detection device according to a second example used in the device of the present invention, and FIG. 7 (b) is a plan view thereof. FIG. 8 is a perspective view of a pyroelectric infrared detection device according to a third example used in the device of the present invention. DESCRIPTION OF SYMBOLS 1 ... Pyroelectric infrared detector, 2 ... 1st amplifier, 3 ... 1st comparator, 4 ... Processing circuit, 5 ... Oscillation circuit, 6 ...
Second amplifier, 7 ... Ultrasonic sensor, 8 ... Third amplifier,
9 ... 1st timer, 10 ... 2nd timer, 11 ... 2nd comparator, 12 ... 3rd comparator, 13 ... Air conditioner, 14 ... Switch.

Claims (1)

[Claims] 1. A pyroelectric infrared detection device, an oscillation circuit that oscillates a predetermined frequency for a fixed time at a constant cycle when the pyroelectric infrared detection device detects infrared light, and is synchronized with the oscillation of the oscillation circuit. And an ultrasonic sensor that emits an ultrasonic wave and converts a reflected wave from the detected object into an electric signal, and at least two or more that output signals at different times in synchronization with the oscillation of the oscillation circuit. Of at least two timers and at least two of the at least two timers compare the output signal from the timer with the electrical signal from the ultrasonic sensor that has received the reflected wave. And the output states of the at least two comparators,
An air conditioning control device, comprising: a processing circuit that determines a distance to a detection object and controls the air conditioning equipment according to the determination.