JP4864537B2 - Elevator door control device - Google Patents

Description

  The present invention relates to an elevator door control device.

  A conventional elevator door control device has a human body contact detection means for outputting a human body contact detection signal when it detects that a human body has come into contact with the door, and a door opening / closing repeated command for repeating the opening and closing of the door a plurality of times with a minute movement distance. And a door control unit that controls the door driving means based on a command from the door opening / closing command generating unit. When a human body contact detection signal is output from the human body contact detecting unit, the door opening / closing command generating unit A door opening / closing repetition command is output from the command generation unit to the door control unit, and the door is configured to repeat opening and closing a plurality of times with a minute movement distance (see, for example, Patent Document 1).

  Such an elevator door control device makes the passenger aware that the passenger's human body is touching the door, moves the human body away from the door, and detects that the human body is drawn between the doorway frame and the door. It is to prevent.

JP 2005-22864 A

  In such a conventional elevator door control device, the value of the door ground capacitance Cd (detected value) detected by the capacitance sensor and the value of the reference capacitance C0 (stored reference value) are used. A capacitance change amount X1 is obtained, and when the change amount X1 is larger than a threshold value X0 recorded in advance, it is determined that there is a human contact.

  For this reason, since the ground capacitance of the door is directly used for the determination, the ground capacitance is likely to change greatly due to humidity and other reasons, and there is a problem that accurate determination is difficult.

  In addition, it can detect only when the human body is in direct contact with the door where the capacitance sensor is installed, and it can detect the human body near the door that is not in contact with the door, and the human body approaching the door. There was a problem that it was not possible.

  In addition, as described above, as a countermeasure against erroneous detection of human contact with the door when the ground capacitance changes greatly due to humidity or other reasons, it is determined whether or not there are passengers in the car by detecting the car load. There existed a subject that it was necessary to provide the load detection means for determining.

  In order to solve such a conventional problem, the present invention eliminates a false determination caused by a large change in the ground capacitance due to factors such as humidity when determining whether a human body is approaching or contacting the door. It aims at providing a control apparatus etc.

The present invention relates to a capacitance sensor that detects a capacitance to ground of a metal plate that is electrically insulated and attached to a landing door or a car door, and a capacitance sensor that is detected by the capacitance sensor. earth capacitance (C2) of, based on the earth capacitance (C1) and the body of the earth capacitance of the door that has been previously stored (C3), the capacitance sensor and the combined capacitance between the door (C12 ) (Where C12 = (C1 + C2 + C3) / 2) , and the calculated combined capacitance or the temporal variation of the calculated combined capacitance and the approach of the human body to the door are determined. When it is determined that the human body has approached the door when the first threshold is exceeded from the comparison with the first threshold, and when it is determined that the human body has approached the door, The calculated composite capacitance or the calculated composite static When the second threshold value is exceeded by comparing the amount of change in capacity with time and a second threshold value that is greater than the first threshold value for determining the contact of the human body with the door. There is provided a human detection means for determining that the door has been touched .

  The present invention can provide an elevator door control device that eliminates erroneous determination caused by a large change in ground capacitance due to factors such as humidity when determining approach or contact of a human body to a door.

  The principle of detecting the approach or contact of a human body or the like to the door by the capacitance sensor according to the present invention will be described with reference to FIGS. FIG. 1 is a schematic diagram for explaining the principle of detection of approach and contact of a human body or the like based on the output of a capacitance sensor according to the present invention. FIG. 2 shows an example of the configuration of the capacitance sensor according to the present invention. FIG. 2A is a side view from the door opening and closing direction, and FIG. 2B shows the electrical configuration of the capacitance sensor. The electrostatic capacity sensor detects the electrostatic capacity of the metal plate 2a attached to the elevator car or the landing door 1 while being electrically insulated from other parts by the insulating member 1a.

  Assuming that the respective ground-to-ground capacitances of the door 1, the capacitance sensor 2, and the human body 3 in FIG. 1 are C1, C2, and C3, respectively, these are shown as follows.

C1 = C11 + C12 + C13
C2 = C21 + C22 + C23
C3 = C31 + C32 + C33
However, for example, C12 is a combined capacitance between the capacitance sensor 2 and the door 1 in the capacitance sensor 2, and C21 is a combined capacitance between the door 1 and the capacitance sensor 2 in the door 1. Indicates the electric capacity.

Here, if C11 = C22 = C33 = 0, C12 = C21, C13 = C31, C23 = C32, the combined capacitance C12 between the capacitance sensor 2 and the door 1 in the capacitance sensor 2 is
C12 = (C1 + C2 + C3) / 2 (1).
This is because if the detection value C2 of the capacitance sensor 2 is used and C1 and C3 are given, the combined capacitance C12 between the capacitance sensor and the door is obtained.

  In the prior art, since the door's ground capacitance value C2 is used to determine the contact of the human body with the door, changes in the ground capacitance due to humidity and other environmental factors appear as detection errors. However, in the present invention, the contact or approach of the human body to the door is determined by using the combined capacitance C12 between the door 1 and the door 1 of the capacitance sensor 2 which is electrically insulated from the door 1. Since the determination based on the relative change amount between the door 1 and the capacitance sensor 2 is performed, the influence of the detection error of the sensor is small.

  FIG. 3 is a characteristic diagram showing a change in accordance with the distance between the door 1 and the human body 3 of the combined capacitance C12 between the capacitance sensor 2 and the door 1. From this characteristic diagram, if the portion A where the combined capacitance C12 gradually increases is applied to determine the approach of the human body to the door, and the portion B where the combined capacitance C12 increases rapidly is applied to the contact determination of the human body. I know it ’s good. At this time, the threshold value used for detecting the approach or contact of the human body is determined by careful experimental results including environmental factors such as temperature and humidity.

Embodiment 1 FIG.
FIG. 4 is a block diagram showing a functional configuration of the elevator door control apparatus according to the embodiment of the present invention. For example, as shown in FIG. 2, a detection value C2 from a capacitance sensor 2 made of a metal plate 2a attached to a car or a landing door 1 (hereinafter referred to as door 1) is sent to the human detection means 4. The capacitance sensor 2 constantly detects the ground capacitance of the metal plate 2a.

  The human detection means 4 includes a capacitance detection unit 41 that inputs a detection value C2 from the capacitance sensor 2 at a predetermined period, and a combined capacitance between the capacitance sensor 2 and the door 1 in the capacitance sensor 2. Capacitance calculation unit 42 that calculates C12, comparison determination unit 43 that determines the approach and contact of the human body to the door 1 based on comparison with the respective threshold values of the calculated combined capacitance C12, the door 1 and the human body 3 The ground capacitances C1 and C3 and threshold values Cx and Cy for determining whether the human body is approaching or touching the door are first set in the data setting unit 45.

  The elevator control unit 8 performs normal elevator operation control for raising and lowering the car according to a call, and when the comparison determination unit 43 determines that a human body is approaching, the elevator control unit 8 from the door to the passenger in the car or the landing A warning control command for generating a sound or voice is sent to the alarm device 11 so as to move away, and when it is determined that there is a human body contact, a door control unit is used to notify that there is a human body contact. 9 sends a door drive command such as a door open / close repeat command to the door drive unit 10 to cause the door 1 to perform a predetermined operation.

  In addition, the elevator control part 8 and the warning device 11 comprise an alarm means, and the elevator control part 8, the door control part 9, and the door drive part 10 comprise a door control means.

  FIG. 5 is an operation flowchart showing an example of the operation of the elevator door control apparatus according to the embodiment of the present invention. Hereinafter, the operation will be described with reference to FIG. 5. First, the data setting unit 45 sets the thresholds for determining the respective ground capacitances C1 and C3 of the door 1 and the human body 3 and the approach and contact of the human body 3 to the door 1. If there are external inputs of Cx and Cy, these are stored in the memory 44 and set (step S1).

  The capacitance detection unit 41 inputs the detection value C2 that is the capacitance to the ground of the capacitance sensor 2 from the capacitance sensor 2 at a predetermined cycle (sample cycle) (step S2). The capacitance calculation unit 42 calculates the capacitance C12 according to the above equation (1) based on the detection value C2 inputted in a predetermined cycle and the ground capacitances C1 and C3 of the door and the human body set in the memory 44. Calculation is performed (step S3).

  The comparison determination unit 43 compares the capacitance C12 calculated by the capacitance calculation unit 42 with a threshold Cx for determining the approach of the human body 3 to the door 1 set in the memory 44 (step S4). If C12> Cx, the comparison with the threshold value Cy for contact determination of the human body 3 is continued (step S5).

  And if it is determined from this comparison result that C12> Cy, there is a human body contact, so in order to notify the passenger of this, for example, the door 1 is repeatedly opened and closed repeatedly for a short distance and repeatedly opened and closed. A door drive command such as a command is output to the elevator control unit 8 (step S6). If it is determined that Cx <C12 ≦ Cy, there is a human body approach. It outputs to the elevator control part 8 (step S7). Here, the threshold value Cx is a desired setting value according to the approach distance from the door 1 to the human body 3, and the threshold value Cy is a setting value obtained based on experiments or the like in advance when the human body 3 contacts the door 1. .

  Thus, when the elevator control unit 8 receives the door drive command, the door control unit 9 controls the door drive unit 10 to cause the door 1 to perform an operation in accordance with the door drive command, and when the warning generation command is received, An alarm by sound or voice is generated in the alarm device 11.

  If it is determined in step S5 that C12> Cy, the comparison / determination unit 43 may also output a warning generation command in step S7 together with the door drive command in step S6, and also generate an alarm.

  Further, in the above description, the contact or approach of the human body to the door is determined by comparing the combined capacitance C12 between the capacitance sensor 2 and the door 1 with a threshold value. You may make it determine the contact or approach of a human body to the door by comparing the amount of change with a threshold related to the amount of change.

  In this case, in the memory 44, instead of the threshold values Cx and Cy for the combined capacitance C12, for a predetermined time of the combined capacitance C12 (for example, the capacitance sensor 2 in the capacitance detection unit 41). Threshold values Dx and Dy are set for the change amount of the detected value C2). The threshold values Dx and Dy are based on the slopes of the portions B and A in the characteristic diagram of FIG. Then, the capacitance calculating unit 42 uses the detection value C2 input at a predetermined cycle and the ground capacitances C1 and C3 of the door and the human body set in the memory 44 according to the above formula (1). And the capacitance C12 calculated at the time of sampling is stored, and the difference from the previous one, that is, the amount of change is calculated (corresponding to step S3). Then, the comparison determination unit 43 determines the change amount of the capacitance C12 calculated by the capacitance calculation unit 42 and the change amount threshold value for the approach determination and the contact determination of the human body 3 with respect to the door 1 set in the memory 44. A comparison determination with Dx and Cy is performed (corresponding to steps S4 and S5), and a door opening / closing repetition command and a warning generation command are similarly output according to the comparison determination result (steps S6 and S7). Others are the same as described above.

  Further, the elevator control unit 8 or the comparison / determination unit displays a passenger detection signal indicating the presence or absence of a car or a passenger from the passenger detection device 7 such as a car load detection device or a car monitoring camera in the car or the hall as in the prior art. In this case, the reliability of the human body detection determination result using the electrostatic capacitance sensor 2 may be further improved by using the information in 43 and using it to determine whether or not it is necessary to drive the door or generate an alarm. However, in this case, the problem that it is necessary to provide load detection means for determining whether or not there is a passenger as the above-described erroneous detection countermeasure does not solve the problem.

  Thus, in order to determine the contact or approach to the door of the human body using the combined capacitance C12 between the door 1 of the capacitance sensor 2 provided by being electrically insulated from the door 1, Since the determination based on the relative change amount between the door 1 and the capacitance sensor 2 is performed, the influence of the change in the ground capacitance due to humidity and other environmental factors is small, and more accurate determination can be performed.

  Since not only the contact of the human body 3 to the door 1 but also the approach of the human body 3 can be detected, a warning sound is issued to a passenger standing near the door or a passenger approaching the door. At the time of opening and closing, the passenger can be notified in advance that the passenger may be caught in or caught in the door.

Embodiment 2. FIG.
In another embodiment of the present invention, in particular, as shown in FIG. 6, the capacitance sensor 2 is attached to the vicinity of the door contact portion K2 that abuts the car or the door 1 of the hall or the entrance / exit frame CF of the hall. Thus, it is possible to prevent a part of the human body 3, for example, a hand or clothes, from being caught between the door contact portion of the door 1 and the entrance / exit frame CF when the door is closed.

Embodiment 3 FIG.
In still another embodiment of the present invention, as shown in FIG. 6, the electrostatic capacitance sensor 2 is preferably closed when the door is closed near the door stop portion K2 of the car or the landing door 1 on the opposite side of the door opening / closing direction. By attaching to the vicinity of the position facing the inner end of the car or the entrance / exit frame CF of the hall, it is possible to prevent a part of the human body 3 such as hands and clothes from being drawn between the door 1 and the entrance / exit frame CF when the door is opened. Can be prevented.

FIG. 1 is a schematic diagram for explaining the principle of detection of approach and contact of a human body or the like based on the output of a capacitance sensor according to the present invention. It is a figure which shows an example of a structure of the electrostatic capacitance sensor in this invention. It is a characteristic view which shows the change according to the distance of the synthetic | combination electrostatic capacitance between the electrostatic capacitance sensor in this invention and a door according to the distance of a door and a human body. It is a block diagram which shows the function structure of the door control apparatus of the elevator by one Embodiment of this invention. It is an operation | movement flowchart which shows an example of operation | movement of the door control apparatus of the elevator by one Embodiment of this invention. It is a figure for demonstrating the attachment position of the electrostatic capacitance sensor in this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Door, 1a Insulating member, 2 Capacitance sensor, 2a Metal plate, 3 human body, 4 person detection means, 7 Passenger detection apparatus, 8 Elevator control part, 9 Door control part, 10 Door drive part, 11 Alarm apparatus, 41 Capacitance detection unit, 42 Capacitance calculation unit, 43 Comparison determination unit, 44 Memory, 45 Data setting unit, C1, C2, C3 Ground capacitance, C12 Composite capacitance, CF gateway frame, Cx, Cy, Dx, Dy threshold, K1 Near the position facing the inner edge of the entrance / exit frame, K2 Near the door stop.

Claims (4)

A capacitance sensor that detects the capacitance of the metal plate that is electrically insulated and attached to the door of the landing or the door of the car; and
Earth capacitance of the electrostatic capacitance sensor which is detected by the capacitive sensor (C2), based on the earth capacitance (C1) and the body of the earth capacitance of the door that has been previously stored (C3), static The combined capacitance (C12) between the capacitance sensor and the door is calculated (where C12 = (C1 + C2 + C3) / 2) , and the calculated combined capacitance or the time variation of the calculated combined capacitance and It is determined that there is an approach to the door of the human body when the first threshold is exceeded from a comparison with a first threshold for determining the approach of the human body to the door, When it is determined that there is an approach to the door, the calculated combined capacitance or the time variation of the calculated combined capacitance and the contact of the human body with the door are further determined. Is the comparison with a second threshold value greater than the first threshold value? And determining human detection means that there is contact with the body of the door if it exceeds the second threshold value,
An elevator door control device comprising:   Alarm means for generating an alarm when it is determined that a person is approaching or contacting the door, and door control for causing the door to perform a predetermined operation for notifying the person of the contact when it is determined that the person is contacting the door The elevator door control device according to claim 1, wherein at least one of the means is provided.   3. The elevator door control device according to claim 1, wherein the capacitance sensor is attached in the vicinity of a door stop portion of a car door or a landing door. 4.   The electrostatic capacity sensor is mounted in the vicinity of a position facing the inner end of the car or the entrance / exit frame of the hall when the door of the car or the door of the hall is closed and the door on the opposite side of the door opening / closing direction is closed. The elevator door control device according to claim 1 or 2.

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