JP4286118B2 - Air conditioner equipped with human body detection sensor and human body detection method of air conditioner equipped with human body detection sensor - Google Patents

Description

  The present invention relates to an air conditioner equipped with a human body detection sensor and a human body detection method thereof.

  The hot wire detector detects weak heat rays generated from the human body and controls the notification. The amplification factor of the amplifier circuit is extremely high, so it malfunctions due to interference from external radio noise. It was easy.

  Therefore, in such an internal unit block of the hot wire detector, the surplus portion of the conductive foil on the component surface side of the circuit board (with the pyroelectric element etc. attached) is used as a ground pattern, and the pattern on the solder surface side Amplifying circuit is mounted directly on the board, and this amplifying circuit is covered from above by a conductive shield case. The amplifier circuit is wrapped and shielded by the conductive shield case and the ground pattern of the circuit board. The interference is eliminated (for example, see Patent Document 1).

  In addition, by detecting the location of conventional human bodies, automobiles or workpieces, automatic door opening and closing control, security alarm activation control, parking lot arrangement, air conditioner, lighting, factory production line, etc. The object presence position detection device that can be used for control, etc., divides a predetermined detection area into a plurality of unit areas, and by installing a plurality of object detectors corresponding to each unit area, the presence of an object What detects a position is generally adopted. However, since an expensive detector such as a human body detection sensor is provided for each unit region, there is a disadvantage that the cost is extremely high.

  Therefore, the object location detection is provided such that light from each unit area is incident on one sensor, and has a function of transmitting and blocking each incident light and sequentially switching the incident light to be transmitted. Although the device has been proposed, this object presence position detection device has only one detection sensor. However, the light from each unit region is alternatively selected as a detection sensor via a corresponding condensing optical system. A switching means having a rotating function or a moving function to be incident, a storage means for operating the switching means to sequentially store the determination results for each unit area, and the human body based on the determination results twice for each unit area And the like, and there is a disadvantage that the frequency of occurrence of failures and the like increases with the complexity of the configuration and the reliability is low.

Therefore, a plurality of detections set by the light receiving optical system as an object location detection device that can accurately detect the location of an object such as a human body in real time with a simple and reliable configuration without a drive mechanism. In an object presence position detection device that optically detects in which area an object such as a human body is present, at least two light receiving elements for converting an incident infrared light beam into an electric signal corresponding to the amount of received light or the amount of fluctuation in received light Each optical system is provided such that a plurality of optical systems are arranged so that light is incident on each light receiving element, and light from the same detection area is incident on each light receiving element through different optical systems. The difference in the optical gain of the required one of this optical system is calculated, the ratio of the output electric signal of each light receiving element is calculated, and the object exists by the calculated value That is those provided a computing circuit for determining the detection area are devised (e.g., see Patent Document 2).
Utility model registration No. 2567177 Patent No. 2741981

  In a conventional hot wire detector, an amplification circuit is directly mounted on a pattern on the solder surface side, and this amplification circuit is covered from above with a conductive shield case. A pyroelectric element or the like is provided on the component surface side of the circuit board. Since it was attached, there was a problem that the inner block of the hot wire detector could not be made small.

  In addition, in the conventional object presence position detecting device, at least two light receiving elements are provided as a set, and a plurality of optical systems are respectively incident on the light receiving elements so that light from the same detection area is received. Each optical system is arranged so as to be incident on each light receiving element through a different optical system, a difference is provided in the optical gain of a required one of these optical systems, and a ratio of output electric signals of each light receiving element is calculated. Based on the calculated value, the detection area where the object is present is determined. The output obtained from the sensor module is sampled based on two judgment conditions of the slope and absolute value of the difference between the voltage value and the moving average value for each sampling. It does not assume the point of making a judgment and improving the judgment accuracy of the presence or absence of a human body.

  In addition, when determining the position of the human body based on the presence / absence determination of the human body, the accuracy of the central position determination is improved by using the timer correction control for the erroneous determination due to the human body presence / absence determination deviation of the left and right sensors when the human body starts moving or stops It does not assume the point to make.

  The present invention has been made in order to solve the above-described problems. The output obtained from the human body detection sensor is sampled with respect to the output value obtained from the difference between the voltage value and the moving average value for each sampling. The purpose of this is to improve the accuracy of determining the presence or absence of a human body.

  In addition, in the B determination unit that determines the position of the human body based on the human body presence / absence determination of the left and right A determination units, the timer correction control is used for erroneous determination due to the human body presence / absence determination deviation due to the movement of the human body and the stoppage. The purpose of this is to improve the accuracy of the central position determination.

  In addition, by installing the amplification circuit at the rear stage together with an infrared light receiving element such as a pyroelectric sensor inside the metal can, the noise resistance due to external noise is increased, the output accuracy from the human body detection sensor is improved, and the human body detection sensor The purpose is to achieve compactness.

  Two air conditioners equipped with the human body detection sensor according to the present invention are mounted on an air conditioner and include a pyroelectric sensor using an infrared light receiving element, and an amplification circuit that amplifies a minute voltage obtained from the pyroelectric sensor; A human body detection sensor, an absolute value determination unit that determines the presence or absence of a human body from a difference between raw data output from the human body detection sensor and a moving average, a difference between past raw data and a moving average, and a current And an inclination determination unit that determines the presence or absence of a human body from an inclination between the difference between the raw data and the moving average value.

  In the air conditioner equipped with the human body detection sensor according to the present invention, since the presence / absence determination of the human body is performed by the absolute value determination unit and the inclination determination unit, it is possible to accurately determine the presence / absence of the human body.

Embodiment 1 FIG.
1 to 10 are diagrams showing the first embodiment, FIG. 1 is a diagram of a substrate mounting the sensor unit, FIG. 2 is a diagram showing details of the internal structure of the sensor unit, and FIG. 3 is a plan view showing the vicinity of the infrared light receiving element. FIG. 4 is a diagram showing a change in surface charge due to a temperature change of the pyroelectric body, FIG. 5 is a diagram showing a sensor module having a lens portion mounted on a substrate, and FIG. 6 is a pair of left and right mirror symmetrical sensor modules. FIG. 7 is a diagram showing a state in which the left and right sensor modules are wrapped in the central portion to realize the left and right division, and FIG. 8 is a diagram showing the flow of calculation inside the microcomputer. 9 is a diagram showing a human body presence / absence determination result of the A determination unit for the sensor module raw data, FIG. 10 is a diagram showing a human body presence / absence determination condition in the A determination unit, and FIG. 11 is a human body presence / absence of the A determination unit for the sensor module raw data. Judgment flow FIG. 12 is a diagram showing a result of the person position determination in the B determination unit, FIG. 13 is a diagram showing a center position erroneous determination mode in the B determination unit, and FIG. 14 is a diagram showing central determination correction timer control in the B determination unit. 15 and 16 are flowcharts of the central determination correction timer control in the B determination unit.

  As shown in FIGS. 1 to 3, a sensor unit 3 in which an amplifier circuit 1 is mounted inside a metal can 2 together with an infrared light receiving element 22 such as a pyroelectric sensor, and a connector 5 are attached to the substrate 4. An electronic component is not mounted on the substrate 4. On the upper surface of the metal can 2, a window 21 made of a silicon lens for allowing infrared rays to pass through the infrared light receiving element 22 is provided.

  Here, the principle of the human body detection sensor (pyroelectric element) will be described with reference to FIG. An object of absolute zero or higher emits infrared rays corresponding to its temperature, and its wavelength distribution of energy is expressed by Planck's law. Moreover, when the temperature of the object increases, the distribution peak moves to the short wavelength side (Vienna's displacement law).

  The pyroelectric element is usually spontaneously polarized but is in an electrically neutral state. When this element absorbs infrared rays as heat rays, the temperature change is output as an electrical signal by the pyroelectric effect. However, since this electrical signal is minute, a pyroelectric element is connected in the sensor as shown in FIG. 4 and is taken out as an output voltage. Therefore, the pyroelectric sensor can obtain an output only when the incident infrared ray intensity changes. As for the human body, when the person is stationary, the infrared intensity incident on the pyroelectric sensor does not change, so there is no output from the pyroelectric sensor, but when the person moves, the infrared intensity incident on the pyroelectric sensor changes. Therefore, an output can be obtained from the pyroelectric sensor.

  As described above, since the amplifier circuit 1 is configured to be mounted inside the metal can 2 together with the infrared light receiving element 22 such as a pyroelectric sensor, there is an effect that the malfunction is not caused by interference from external radio noise or the like. .

  In addition, since the amplifier circuit 1 is configured to be mounted inside the metal can 2 together with the infrared light receiving element 22 such as a pyroelectric sensor, there is an effect that a reduction in size can be realized.

  As shown in FIG. 5, a sensor module 7 as an example of a human body detection sensor is obtained by attaching a lens unit 6 that collects infrared rays to a substrate 4 on which the sensor unit 3 shown in FIG. 1 is attached.

  As shown in FIG. 6, the air conditioner 10 (an indoor unit of a separation type air conditioner) has a right sensor 8 and a left sensor 9 configured by a sensor module 7 mounted on the lower part of the front face in left and right mirror symmetry. is doing. However, the attachment positions of the right sensor 8 and the left sensor 9 are not limited to the lower part of the front surface, and may be anywhere as long as the human body in the room can be detected.

  As shown in FIG. 7, the sensor module light distribution from the air conditioner 10 in which the right sensor 8 and the left sensor 9 symmetric to the left and right mirrors are mounted in left and right pairs is wrapped at the center, and the indoor space is left and right. The direction is divided into a right area 11, a central area 12, and a left area 13.

  As shown in FIG. 8, from the outputs obtained from the right sensor 8 and the left sensor 9 that are symmetrical to the left and right mirrors, the A determination unit 14 in the microcomputer determines the presence or absence of a person, and from the determination result of the A determination unit 14 B The determination unit 15 determines the position of the person.

Next, the operation will be described.
In the air conditioner 10 in which the right sensor 8 and the left sensor 9 that are symmetrical with the left and right mirrors configured as described above are mounted in left and right pairs, the human body moves within the sensor module light distribution shown in FIG. FIG. 9 shows the raw data 16 of the sensor module when it comes. The output of the sensor module changes as the person moves like the raw data 16, and does not change when the person is stationary.

  Based on the raw data 16 obtained from the sensor module, the A determination unit 14 in the microcomputer shown in FIG. 8 calculates a moving average value 17 for each sampling, and the presence / absence of a human body is determined according to the human body presence / absence determination condition shown in FIG. to decide.

  The presence / absence determination of the human body based on the raw data 16 can be determined from the absolute value of the raw data 16 because the change in output is large when the person is moving, but in the vicinity of the moving average value 17, the raw data 16 Since the difference between the moving average value 17 and the moving average value 17 is small, it may not be possible to determine by absolute value determination, so the difference between the past raw data 16 and the moving average value 17 and the difference between the current raw data 16 and the moving average value 17 The presence / absence of a human body is determined based on the inclination.

  As shown in FIG. 11, absolute value determination, which is one of the determination conditions, determines that there is a human body when the difference between the raw data 16 captured every sampling and the moving average value 17 is equal to or greater than a set threshold A ( Absolute value determination unit, absolute value determination step).

  The absolute value determination result 18 based on the raw data 16 is shown in FIG. 9. When the determination result is 2, it is determined that there is no human body, and when it is 3, it is determined that there is a human body.

  Inclination determination, which is another determination condition, is to obtain the inclination from the absolute value determination result calculated in the past and the current absolute value determination result. As shown in FIG. If the slope (difference) between the difference from the average value 17 and the difference between the current raw data 16 and the moving average value 17 is equal to or greater than the set threshold B, it is determined that there is a human body (a slope determination unit, a slope determination step). ).

  An inclination determination result 19 based on the raw data 16 is shown in FIG. 9. When the determination result is 1, it is determined that there is no human body, and when it is 2, it is determined that there is a human body.

  The A determination unit 14 determines that there is a human body when it is determined that there is a human body under one of the absolute value determination result 18 and the inclination determination result 19, which are the above-described conditions, or both conditions.

  If it is determined that neither the absolute value determination result 18 nor the inclination determination result 19 is a human body, the A determination unit 14 determines that there is no human body. As shown in FIG. 7, the A determination unit determination result 20 is a human body determination when the determination result is 0, and a human presence determination when the determination result is 1.

  The above-described human body presence / absence determination is individually calculated from the raw data 16 obtained from the right sensor 8 and the left sensor 9.

  As described above, since the presence / absence determination of the human body is performed by the absolute value determination and the inclination determination, the human body presence / absence determination can be accurately performed.

  In addition, the threshold value for absolute value judgment and tilt judgment can be changed at the start of detection with human body and at the time of non-detection of human body, and at the start of human body detection, the threshold value is lowered to make detection easier. As a result, the accuracy of the presence determination in the A determination unit 14 is improved.

  As the threshold value used for the absolute value determination, the threshold value A is used when the human body is detected, and the threshold value A1 is used when the human body is not detected. Similarly, as the threshold value used for the inclination determination, the threshold value B is used when the human body is detected, and the threshold value B1 is used when the human body is not detected. The threshold A <the threshold A1, and the threshold B <the threshold B1.

  Based on the determination result of the A determination unit 14 obtained from the right sensor 8 and the left sensor 9, the B determination unit 15 determines the human body position. The human body position determination conditions in the B determination unit 15 are shown in FIG. When the result of the A determination unit 14 in the right sensor 8 is detected and the result of the A determination unit 14 in the left sensor 9 is not detected, the B determination unit 15 determines that the human body position is on the right side. .

  When the result of the A determination unit 14 in the reverse right sensor 8 is not detected and the result of the A determination unit 14 in the left sensor 9 is detection, the human body position in the B determination unit 15 is on the left side. to decide. When the determination result in the A determination unit 14 of the right sensor 8 and the left sensor 9 is detected, it is determined that the human body position is the center. And when the result in the A determination part 14 of the right sensor 8 and the left sensor 9 is not detected, the result of the B determination part 15 is held.

  In the B determination unit 15 that determines the human body position described above, when the human body starts to move from the central position as shown in FIG. 13 and stops at the central position, the right sensor 8 and the left sensor 9 due to output variations of the sensor modules There may be a case where a judgment error of the A judgment unit 14 occurs.

  Due to the deviation of the A determination unit 14, the position determination in the B determination unit 15 may be erroneously determined as the right side or the left side even though the human body is in the center. Therefore, in order to prevent erroneous determination in the B determination unit 15, central determination correction timer control is used as shown in FIG. The flowchart is shown in FIGS.

  When the human body starts moving from the center position, if the presence of the human body comes out first from the A determination unit 14 of the right sensor 8, a timer is started. When the human body presence determination is issued from the A determination unit 14 of the left sensor 9 while the timer is activated, the human body determination is simultaneously issued from the right sensor 8 and the A determination unit 14 of the left sensor 9.

  Similarly, when the human body is stationary at the center position, the timer is started at the same time when the right sensor 8 first determines that there is no human body, and the A determination unit 14 of the left sensor 9 determines whether there is no human body during the timer activation. If it is, the A determination unit 14 will make a determination that there is no human body at the same time.

  If the timer of either the right sensor 8 or the left sensor 9 is counting and the determination result of the other A determination unit 14 does not change, the determination result is output from the A determination unit 14 simultaneously with the timer count-up. . By using this configuration, it is possible to accurately determine the presence / absence of the human body and the determination of the human body position without misjudging the right side or the left side despite the human body in the center.

It is a figure which shows Embodiment 1, and is a board | substrate block diagram which mounted the sensor part. It is a figure which shows Embodiment 1, and is a figure which shows the detail of the internal structure of a sensor part. It is a figure which shows Embodiment 1, and is a top view which shows infrared rays light receiving element vicinity. It is a figure which shows Embodiment 1, and is a figure which shows the sensor module which mounted the lens part on the board | substrate. It is a figure which shows Embodiment 1, and is a figure which shows the air conditioner which mounts the left-right mirror symmetrical sensor module in the left-right pair. It is a figure which shows Embodiment 1, and is a figure which shows the state which realized the left-right 3 division by wrapping the light distribution of a left-right sensor module in the center part. It is a figure which shows Embodiment 1, and is a figure which shows the flow of the calculation inside a microcomputer. It is a figure which shows Embodiment 1, and is a figure which shows the human body presence determination result of A determination part with respect to the raw data of a sensor module. It is a figure which shows Embodiment 1, and is a figure which shows the human body presence determination condition in A determination part. It is a figure which shows Embodiment 1, and is a figure which shows the person position determination result in B determination part. It is a figure which shows Embodiment 1, and is a flowchart figure of a human body presence determination of the A determination part with respect to the raw data of a sensor module. It is a figure which shows Embodiment 1, and is a figure which shows the person position determination result in B determination part. It is a figure which shows Embodiment 1, and is a figure which shows the center position misjudgment mode in a B determination part. FIG. 5 is a diagram illustrating the first embodiment and is a diagram illustrating central determination correction timer control in a B determination unit. FIG. 5 is a diagram illustrating the first embodiment, and is a flowchart of central determination correction timer control in a B determination unit. FIG. 5 is a diagram illustrating the first embodiment, and is a flowchart of central determination correction timer control in a B determination unit.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Amplification circuit, 2 Metal can, 3 Sensor part, 4 Substrate, 5 Connector, 6 Lens part, 7 Sensor module, 8 Right sensor, 9 Left sensor, 10 Air conditioner, 11 Right area, 12 Center area, 13 Left area , 14 A determination unit, 15 B determination unit, 16 raw data, 17 moving average value, 18 absolute value determination result, 19 tilt determination result, 20 A determination unit determination result, 21 window, 22 infrared light receiving element.

Claims (6)

A human body sensor having two pyroelectric sensors mounted on the air conditioner body and using an infrared light receiving element; and an amplification circuit that amplifies a minute voltage obtained from the pyroelectric sensor;
An absolute value determination unit for determining the presence or absence of a human body from the difference between the raw data output by the human body detection sensor and the moving average value;
An inclination determination unit that determines the presence or absence of a human body from the difference between the past raw data and the moving average value and the difference between the current raw data and the moving average value;
An air conditioner equipped with a human body detection sensor.   2. The air conditioner equipped with a human body detection sensor according to claim 1, wherein the determination threshold values of the absolute value determination unit and the inclination determination unit are lowered at the start of detection of presence of a human body than when no detection of human body is detected.   The two mounted human body detection sensors have a left-right mirror symmetrical structure, are arranged in left and right pairs, have an angle of infrared incident light distribution by a lens unit, and infrared rays of the human body detection sensors arranged in the left and right pairs. By superimposing the incident light distribution at the center, the indoor detection area is divided into three, and based on the human body presence / absence determination results of the absolute value determination unit and the inclination determination unit obtained from the two mounted human body detection sensors. 2. The air conditioner equipped with the human body detection sensor according to claim 1, wherein it is determined in which of the three divided indoor detection areas a human body exists.   When the human body starts moving from the center position, if a human body presence sensor is issued from the one human body detection sensor, a timer is activated, and the human body detection sensor issues a human body presence sensor during the timer activation. The air conditioner equipped with the human body detection sensor according to claim 3, wherein in the case, a human body presence determination based on the two human body detection sensors is made simultaneously.   When the human body is stationary at the center position, if a human absence detection is issued from the one human body detection sensor, a timer is started, and a human absence detection is issued from the other human body detection sensor during the timer activation. The air conditioner equipped with the human body detection sensor according to claim 3, wherein in the case, no human body determination based on the two human body detection sensors is made at the same time. In a human body detection method for an air conditioner equipped with two human body detection sensors each having a pyroelectric sensor using an infrared light receiving element and an amplification circuit for amplifying a minute voltage obtained from the pyroelectric sensor,
An absolute value determination step of determining the presence or absence of a human body from the difference between the raw data output by the human body detection sensor and the moving average value;
An inclination determination step for determining the presence or absence of a human body from the difference between the past raw data and the moving average value, and the difference between the current raw data and the moving average value;
A human body detection method for an air conditioner equipped with a human body detection sensor.

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