JPH10184247A - Abnormality decision device for electric shutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the burning, etc., of a driver circuit by installing an abnormality-cause discrimination means discriminating the cause of abnormarity decision during closing driving on the basis of the decision result of an abnormal decision means to the quantity of the state of a motor detected by a current detector during the opening driving of a shutter. SOLUTION: When an operator depresses a closing driving switch, the shutter 2 is driven to closing, a current detector 6 detects a current flowing through a motor 3, an abnormality decision means 8 decides whether or not the detected current exceeds a decision reference value, and an abnormality-cause decision means 9 stops the closing driving of the shutter 2 when the current exceeds the reference value and indicates opening driving. The abnormality decision means 8 decides whether or not a current detected during the opening driving of the shutter 2 exceeds the decision reference value, the abnormality-cause decision means 9 stops the opening driving of the shutter 2 when the current exceeds the reference value, and abnormality during closing driving due to the deterioration of the resistance, etc., of a driver circuit 4 for the motor 3 is judged. Accordingly, the burning, etc., of the driver circuit 4 can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric shutter for automatically opening and closing a shutter provided on a truck bed or the like by an electric motor. The present invention relates to an abnormality determination device.

[0002]

2. Description of the Related Art Conventionally, an electric shutter control device for automatically opening and closing a shutter provided on a truck bed by an electric motor has been designed in consideration of safety when the shutter is automatically opened and closed. A detection unit for detecting an abnormality that occurs with the opening / closing drive is provided.
Such a detecting means includes, for example, a touch sensor that detects an obstacle such as a person or an object by directly touching the shutter when the shutter is being driven, or an obstacle that may collide beforehand. There is a so-called direct detection unit such as a proximity sensor or a photoelectric sensor that can be detected. Further, there is a so-called indirect detection means in addition to the direct detection means, and the indirect detection means detects a current and a rotation speed (state quantity) of the electric motor. For example, when the shutter is driven to close and the current or the rotation speed detected thereby exceeds the initially set determination reference value, the abnormality determination means determines whether the shutter is being driven to close. The motor is stopped when it is determined that an abnormality has occurred for some reason, and the indirect detection means is installed in addition to the direct detection means in order to enhance safety at the time of automatic opening and closing of the shutter. Often.

[0003]

However, in the case of the conventional abnormality determination device provided with the indirect detection means as described above, some abnormalities occur during the closing drive of the shutter based on the state quantity detected by the indirect detection means. Information can be obtained, but whether the abnormality is caused by any cause, that is, whether the change in the state quantity is due to the collision of the shutter with a person or an object, Alternatively, there is a problem that it is not possible to determine whether the change is caused by the deterioration of the resistance or the like of the drive circuit of the motor. Particularly, when the change is caused by the deterioration of the resistance or the like of the drive circuit of the motor, the drive circuit There is a problem that the burnout of the steel is also caused.

[0004] It is an object of the present invention to provide an electric shutter abnormality judging device capable of judging the cause of an abnormality that occurs with the closing operation when the electric shutter is automatically opened and closed. Further, an object of the present invention is to determine the cause of an abnormality that occurs with the closing drive of the electric shutter, thereby maintaining safety at the time of closing drive and also preventing burning of the drive circuit. An object of the present invention is to provide an abnormality determination device for an electric shutter.

[0005]

In order to solve the above-mentioned problems, an apparatus for determining abnormality of an electric shutter according to the present invention includes an indirect detection device for detecting a state quantity of the electric motor when opening and closing the shutter by the electric motor. Means, when the shutter is being driven to close, further comprising abnormality determination means for comparing the state quantity of the electric motor detected by the indirect detection means with a predetermined determination reference value to determine whether there is an abnormality, further comprising: When it is determined that the abnormality is abnormal by the abnormality determining means, the motor is instructed to open the shutter, and during the open driving, the abnormality determining means determines the state amount detected by the indirect detecting means. And an abnormality cause determining means for determining the cause of the abnormality determination performed during the closing drive of the shutter.

In this case, the state quantity detected by the indirect detection means is a current flowing through the electric motor, its rotation speed, and the like. When such a current and / or rotation speed exceeds a predetermined judgment reference value, It is determined that an abnormality has occurred for some reason, for example, during closing drive of the shutter. By the way, the predetermined criterion value is a value which is set from past use result data or the like, but need not always be constant, for example, in a relationship of criterion value = F (current, rotation speed). The reference value to be represented may be selected according to the conditions of use of the shutter, or may be adjusted according to learning rules or inference rules. In this case, it is possible to obtain a reference value suitable for the condition. It is more preferable because it is possible.

When it is determined by the abnormality determining means that the motor is abnormal, the motor is instructed to open the shutter, and when the motor is driving the shutter, the current flowing through the motor or the number of rotations of the motor is determined. Alternatively, both the current and the number of rotations are detected, and the cause of the abnormality determination means determining an abnormality when the motor is closing the shutter can be determined based on the determination result with respect to the detected values. is there. By the way, the determination with respect to the detection value is performed by comparison with a predetermined determination reference value.
Such a criterion value does not need to be the same as the criterion value used for the abnormality determination during the closing drive of the shutter described above, and is not always a constant value, but is corrected according to the use condition of the shutter as described above. It is preferable to be able to make changes.

The abnormality determination apparatus for an electric shutter according to the present invention determines the cause of the abnormality determination during the closing drive of the shutter. Specifically, the abnormality determination means determines the abnormality during the open drive. If the abnormality determination for the state quantity of the means is not performed, it is determined that a person or an object has been caught in the shutter that is being driven closed, and
When abnormality determination is performed, for example, it is determined that an abnormality has occurred due to deterioration of the resistance or the like of the drive circuit of the electric motor. With such a device, it is possible to determine what cause the abnormality determination is due to, and it is possible to perform a corrective action for the abnormality, so that while maintaining safety at the time of shutter closing drive, resistance can be reduced. It is also possible to prevent the drive circuit from burning due to deterioration of the drive circuit.

[0009]

FIG. 1 shows an example of an embodiment of the present invention.
This will be described with reference to FIGS. When the electric shutter 3 automatically opens and closes the shutter 2 provided on a truck bed or the like with the electric motor 3,
The cause of the abnormality that occurs with the closing drive is determined, and safety of the closing drive is maintained, and burnout of the drive circuit 4 of the electric motor 3 can be prevented. ,
It is a block diagram showing the outline of the closing drive control. As shown in FIG. 1, the apparatus 1 includes a control circuit 5 including a microcomputer, and the above-described drive for controlling the electric motor 3 based on a control signal from the control circuit 5, for example, by pulse width modulation (PWM). The circuit 4 and, in this embodiment, a current detector (indirect detection means) for detecting the current of the electric motor 3
And a detection signal from the detector 6 is input to the control circuit 5. The drive circuit 4 includes:
A power supply unit 7 for supplying power to the drive circuit 4 is connected. When the operator presses a closing drive switch (not shown), an instruction signal for closing the shutter 2 from this switch is supplied to the electric motor 3 via the control circuit 5 and the drive circuit 4. Can be automatically driven to close.

The control circuit 5 includes a detector 6
The abnormality detection means 8 which determines that the current is detected as abnormal when the current detected by the control exceeds a predetermined reference value, for example, 30 A, is further provided. The motor 3 is instructed to open the shutter 2, and during the opening operation, the abnormality judging means 8 judges whether the current is abnormal, that is, when the current exceeds a reference value, for example, 30 A, which is the same value as in the closing operation. If it is not determined that the shutter 2 is closed, it is determined that a person or an object has been caught in the shutter 2 that is being driven closed, and if it is determined that it exceeds 30 A, An abnormality cause determining means 9 for determining that an abnormality has occurred due to deterioration of the resistance or the like of the drive circuit 4 of the electric motor 3 is provided.

FIG. 2 is an exploded perspective view showing a schematic configuration of a shutter 2 driven and controlled by the apparatus 1 and an engaging member thereof. As shown in FIG. 1, the shutter 2 has a pair of guide rails 11 disposed near a frame 10 provided on a truck bed or the like (not shown).
1 is attached via a seal rubber 12 (only one side is shown in the figure) so as to be slidable along the reference numeral 1. Specifically, a bearing 13a and a guide roller 13b are respectively provided on a support plate 13 attached to the upper end of the rail 11, and the shutter 2 is wound via a balancer 15 supported by the bearing 13a. Roller 13b
The shutter 2 is mounted so that both ends of the shutter 2 are guided and the shutter 2 slides. The shutter 2 uses the electric motor 3 and a power unit 16 composed of a speed reducer and a gear train connected to the electric motor 3 as a driving source, and the driving force of the power unit 16 is axially attached to both ends of a shaft 14 via a chain 17. The transmission / reception is transmitted to the driven wheel gear 18 to open / close. By the way, the balancer 15 is provided with a spring 19,
The spring 19 is attached by biasing the shutter 2 in a direction of winding the shutter 2 around the balancer 15.
The lowermost end of the shutter 2 is fixed to the chain 17 by a bracket 17a. An upper limit switch 20 and a lower limit switch 21 are provided above and below the rail 11 to limit the opening and closing drive of the shutter 2 within a predetermined range. The operation is performed by the fixed magnet 22. Also,
Below the frame 10, a photoelectric sensor (direct detection means) 23 for detecting an obstacle that may collide with the shutter 2 beforehand is provided.

Next, the closing drive control according to the present apparatus 1 will be described with reference to FIG.
This will be described with reference to the flowchart of FIG. When the operator presses the closing drive switch, the shutter 2 is driven to close by the power unit 16 including the electric motor 3 (step S).
1). In this case, the current detector 6 sequentially detects the current of the motor 3 and detects the current flowing through the motor 3 (Step S2). Then, the abnormality determining means 8 determines whether or not the detected current exceeds a predetermined determination reference value 30A, and if not, the motor 3 continues to drive the shutter 2 to close, but the reference value 30A. That is,
If it is determined that there is an abnormality (step S3), the next step S4
The abnormality cause determination means 9 stops the closing drive of the shutter 2 and instructs the opening drive (step S5).

Even when the shutter 2 is being driven to open, the current detector 6 sequentially detects the current of the motor 3 and detects the current flowing through the motor 3 (step S6). At this time, the abnormality determining means 8 determines whether or not the detected current exceeds a predetermined reference value 30 A. If not, the motor 3 continues to drive the shutter 2 to open. If it is determined that it exceeds 30A (step S7), the process proceeds to the next step S8, and the abnormality cause determining means 9
Stops the opening operation of the shutter 2, and determines that the abnormality during the closing operation is caused by deterioration of the resistance or the like of the drive circuit 4 of the electric motor 3 (step S9). In step S7, the abnormality determining means 8 is operated until the shutter 2 reaches a predetermined moving distance, for example, 10 cm from the stop position.
Makes a determination on the current. However, no abnormality is determined by the abnormality determining means 8 (Step S
7) Further, when it is detected that the shutter 2 has reached the predetermined moving distance (step S10), the process proceeds to the next step S11, where the abnormality cause determining means 9 stops the opening drive of the shutter 2, and It is determined that the abnormality during the closing drive is caused by a person or an object being caught in the shutter 2 (step S12).

On the other hand, even if it is not determined in step S3 that there is an abnormality, the photoelectric sensor 23 detects an obstacle such as a person or an object that may collide with the shutter 2 that is driven closed (step S13). If the obstacle is detected in step S14, the control circuit 4
The closing drive of the shutter 2 is stopped (step S15),
It instructs the opening drive of the shutter 2 and continues the opening drive until the shutter 2 reaches a predetermined moving distance, for example, 10 cm from its stop position (step S16). In step S17, it is determined that the shutter 2 has reached the predetermined moving distance. When it is determined, the opening drive of the shutter 2 is stopped (step S18). It is clear that the cause of the abnormality detected by the photoelectric sensor 23 depends on the cause, and therefore, it is not sufficient to provide a means for determining the cause of the abnormality such as an indirect detection means. If no obstacle is detected in step S14, the shutter 2 is continuously driven to be closed, and while the shutter 2 is being driven to be closed, steps S2 and S3 and steps S13 and S14 are executed. In step S19,
When the completion of the closing drive of the shutter 2 is detected by the magnet 22 and the lower limit switch 21 responsive thereto, the control circuit 4 stops the closing drive (step S20).

By the way, as an embodiment of the present apparatus 1, in the present embodiment, a description has been given of an example in which the present invention is applied to a shutter 2 provided on a bed of a vehicle such as a truck. However, the present invention is not limited to this. Needless to say, the present invention may be applied to a shutter or the like. Further, the present apparatus 1 determines the cause of the abnormality when the shutter 2 is driven to close, and determines the cause of the abnormality when the shutter 2 is driven to open by the same method. The abnormality determination device configured as described above can also be configured.

[0016]

According to the electric shutter abnormality judging device of the present invention, it is possible to judge the cause of the abnormality that occurs with the closing operation when the electric shutter is automatically opened and closed.
Further, according to the abnormality determination device for the electric shutter of the present invention, by determining the cause of the abnormality that occurs with the closing drive of the electric shutter, the drive circuit thereof is maintained while maintaining safety during the closing drive. Can also be prevented from burning.

[Brief description of the drawings]

FIG. 1 is a block diagram schematically showing closing drive control of an electric shutter abnormality determination device according to the present embodiment.

FIG. 2 is an exploded perspective view of a shutter controlled by the apparatus of FIG. 1 and an engagement member thereof.

FIG. 3 is a flowchart illustrating a control operation at the time of closing driving of a shutter in the apparatus of FIG. 1;

[Explanation of symbols]

 Reference Signs List 1 abnormality determination device 2 shutter 3 motor 4 drive circuit 5 control circuit 6 current detector (indirect detection means) 8 abnormality determination means 9 abnormality cause determination means

Claims (2)

[Claims] An indirect detection means for detecting a state quantity of the motor when the shutter is opened and closed by an electric motor; and an indirect detection means for detecting the state quantity of the electric motor when the shutter is being driven to close. Abnormality determining means for comparing the state quantity with a predetermined value to determine whether there is an abnormality; and, when the abnormality determining means determines that there is an abnormality, instructing the motor to open the shutter, An abnormality cause determination unit that determines a cause of the abnormality determination during the close drive based on a determination on the state amount detected by the indirect detection unit by the abnormality determination unit during driving. Characteristic abnormality determination device for electric shutter. 2. The abnormal cause determining means determines that the shutter has been caught by a person or an object when the abnormality amount is not determined by the abnormality determining means with respect to the state quantity. The abnormality determination device for an electric shutter according to claim 1, wherein when it is determined, it is determined that an abnormality has occurred in the electric motor or the like.