JP2002106258A - Catch determination device and opening/closing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correctly determine catch/non-catch, even when there is an external vibration. SOLUTION: This catch determination device is provided with a first piezoelectric sensor 10 generating an output by the catch and a second piezoelectric sensor 11 generating an output by vibration of an opening/closing portion 8. When the catch is generated in a state of receiving the external vibration, the first piezoelectric sensor 10 generates the output caused by the both of the catch and the external vibration, while the second piezoelectric sensor 11 generates an output only by the external vibration so that a determination means 12 can distinct the output component caused by the external vibration from the output component by the catch from the both outputs and even if there is the external vibration, it can correctly determine the catch and non- catch.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an entrapment determining device and an opening / closing device for judging whether or not an object is entrapped when an opening / closing portion is closed. window,
The present invention relates to a safety device for an electric door such as a sliding door.

[0002]

2. Description of the Related Art Conventionally, as this kind of safety device, for example, there has been one described in Japanese Patent Application Laid-Open No. H11-303504. FIG. 12 shows an example in which a pinch determination device using a piezoelectric sensor is applied to a power window, which is described in the above publication. The n piezoelectric sensors 1a to 1n are arranged on the window frame 2, and the judging means 3 judges the presence or absence of pinching based on the number of outputs of the piezoelectric sensors 1a to 1n exceeding a set value. Specifically, when a part of the outputs of the piezoelectric sensors 1a to 1n exceed the set value, it is determined that the pinch is present, and when all of the outputs exceed the set value, it is determined that the external vibration has been applied. It is determined that there is no entrapment, and if all are below the set value, it is determined that there is no extraneous vibration or entrapment.

[0003]

However, in the above-described conventional configuration, when pinching occurs in the presence of external vibration, all of the outputs of the piezoelectric sensors 1a to 1n exceed a set value and no pinching occurs. May be erroneously determined. Therefore, if all of them exceed the set value, it is not possible to determine the presence or absence of entrapment because the external vibration is large.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a pinch determination device and an opening / closing device capable of correctly determining the presence or absence of a pinch even when there is external vibration.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned conventional problems, a pinch determination device and an opening / closing device according to the present invention provide a first piezoelectric sensor which generates an output by pinching, and an output which is generated by vibration of an opening / closing section. It has a second piezoelectric sensor that is generated, and a determination unit that determines the presence or absence of pinching based on the outputs of the first piezoelectric sensor and the second piezoelectric sensor.

[0006] With this arrangement, when a pinch occurs when external vibration is present in the opening / closing section, the first piezoelectric sensor generates an output by both the pinch and the external vibration, whereas the second piezoelectric sensor generates an output by the external vibration. Therefore, the determination means can distinguish the output component due to external vibration and the output component due to entrapment from both outputs, and can correctly determine the presence or absence of entrapment even when there is external vibration.

[0007]

DETAILED DESCRIPTION OF THE INVENTION The invention according to a first aspect of the present invention is directed to an opening / closing section comprising a moving member and an abutting member, and a first piezoelectric sensor for generating an output by sandwiching an object in the opening / closing section. A second piezoelectric sensor that generates an output due to the vibration of the opening / closing unit; and a determination unit that determines whether or not a pinch has occurred based on the output of the first piezoelectric sensor and the output of the second piezoelectric sensor. By doing so, when pinching occurs when there is external vibration in the opening / closing section, the first piezoelectric sensor generates an output by both the pinching and the external vibration, while the second piezoelectric sensor generates an output by the external vibration. Since only an output is generated, the judging means can distinguish the output component due to external vibration and the output component due to entrapment from both outputs, and can correctly judge the presence or absence of entrapment even when there is external vibration. .

[0008] The invention described in claim 2 is particularly advantageous in claim 1.
In the entrapment determination device described in 1 above, the determination means includes:
By determining the presence / absence of entrapment based on the difference between the output of the piezoelectric sensor and the output of the second piezoelectric sensor, the output due to external vibration can be reduced from the combined output of entrapment and external vibration. Since only the output can be obtained, the same effect can be easily obtained.

[0009] The invention described in claim 3 is particularly advantageous in claim 2.
In the entrapment determination device described in 1 above, the determination means includes:
First output processing means for processing the output of the piezoelectric sensor;
Second output processing means for processing the output of the second piezoelectric sensor, and determining the presence or absence of pinching based on the difference between the output of the first output processing means and the output of the second output processing means With this configuration, the first piezoelectric sensor and the second piezoelectric sensor
Even if the characteristics of output to vibration differ due to differences in the shape and arrangement method of the piezoelectric sensor, the difference can be obtained after processing the output suitable for each, so the same effect can be further enhanced Can be.

[0010] The invention described in claim 4 is particularly advantageous in claim 1.
In the entrapment determination device described in the above, the first piezoelectric sensor and the second piezoelectric sensor are arranged under the same vibration conditions, so that when they receive an external vibration, both receive the same vibration. Among the outputs, the output component due to the external vibration becomes the same, the accuracy of distinguishing the output component due to the external vibration from the output component due to the pinching is increased, and the same effect can be further enhanced.

[0011] The invention described in claim 5 is particularly advantageous in claim 4.
The first piezoelectric sensor and the second piezoelectric sensor are arranged on only one of the moving member and the contact member, so that both can be easily subjected to the same vibration condition. It can be arranged below,
Similar effects can be further enhanced.

[0012] The invention described in claim 6 is particularly advantageous in claim 1.
In the entrapment determination device described in the above, by adopting a configuration having a contact prevention means for preventing contact of an object with the second piezoelectric sensor, the second piezoelectric sensor can accurately capture only external vibration, Similar effects can be further enhanced.

[0013] The invention described in claim 7 is particularly advantageous in claim 6.
In the pinching determination device described in the above, the contact prevention means has a rigid body, and the rigid body covers the second piezoelectric sensor to prevent the object from contacting the second piezoelectric sensor, so that the contact preventing means can be easily configured. Since the contact of the object with the second piezoelectric sensor can be prevented, the same effect can be easily obtained.

[0014] The invention described in claim 8 is particularly advantageous in claim 1.
An entrapment determination device according to any one of claims 1 to 7,
Driving means for driving a moving member, and control means for controlling the driving means according to the determination of the entrapment determination device,
When the entrapment determination device determines that entrapment is present while the opening / closing part is moving in the closing direction, the control means stops the movement of the moving means or reverses the moving direction to move in the opening direction. With the configuration in which the driving means is controlled, it is possible to correctly determine the presence or absence of entrapment even when there is external vibration, so that the safety and reliability of the switching device can be improved.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIGS. 1 to 6 show a pinch determination device and an opening / closing device according to Embodiment 1 of the present invention.
This shows an example applied to an electric sunroof of an automobile.

First, the configuration will be described with reference to FIGS. FIG. 1 is a top view of the roof of an automobile, and the left side is the front of the automobile. In order to form an electric sunroof 5 which is a typical opening / closing device on a roof 4 of an automobile,
An opening / closing section 8 is constituted by a sliding roof 6 as a moving member and a roof frame 7 as an abutting member, and the sliding roof 6 is attached to the roof frame 7 around the sliding roof 6 to close the opening / closing section 8. It has a sealing member 9 for closing the gap between the sliding roof 6 and the roof frame 7 when the sliding roof 6 comes into contact with the roof frame.

The figure shows a state in which the sliding roof 6 is opened to some extent. When the sliding roof 6 is closed, the sliding roof 6 moves to the left in the figure. Since the sliding roof 6 moves, there is a possibility that a gap is formed between the sliding roof 6 and the roof frame 7 not only at the front but also at the left and right, or behind, so that an object is sandwiched. In the sealing member 9, a first piezoelectric sensor 10 which is deformed by sandwiching an object in the opening / closing section 8 to generate an output is mounted over substantially the entire circumference. The second piezoelectric sensor 11 is set so that the same vibration condition
Is arranged.

In the sealing member 9, a first piezoelectric sensor 10
The determination means 12 for determining the presence or absence of entrapment based on the output of the second piezoelectric sensor 11 and the output of the second piezoelectric sensor 11 is also integrated.
A device that determines whether the object is pinched in the opening / closing section 8 by combining the sliding roof 6 and the roof frame 7 forming the opening / closing section 8, the first piezoelectric sensor 10, the second piezoelectric sensor 11, and the judging means 12. Because of this, it is referred to as the entrapment determination device 13. The output of the judging means 12 is transmitted to the control means 14, which outputs a control signal to a motor 15 which is a typical driving means, and the sliding roof 6 is moved by the operation of the motor 15. Entrapment determination device 13, control means 14, motor 1
5 form an electric sunroof 5.

FIG. 2 is a sectional view taken along the line AA of FIG. 1, and a gap 16 is provided between the first piezoelectric sensor 10 and the sliding roof 6 in the sealing member 9.
Is formed so that the first piezoelectric sensor 10 is easily deformed when an object is sandwiched. On the other hand, since the second piezoelectric sensor 11 only wants to detect vibration, it is covered with a rigid body 17 as a contact preventing means so that an external object or the like cannot easily come into contact. Although not shown here, a means for detecting normal closing is necessary in order to distinguish between a case where an object is pinched and a case where the object is normally closed. For example, the torque of the motor 15 is detected, or another sensor that generates a signal only when the motor 15 is completely closed is mounted.

FIG. 3 shows the structure of the judging means 12.
2 for transmitting the signal from the control unit 2 to the control unit 14 and the metal case 1 for shielding the determination unit 12
9. Since the first piezoelectric sensor 10 does not know where the pinch occurs in the opening / closing section 8, it has a length that makes a round around the sliding roof 6. However, the second piezoelectric sensor 11 is for detecting vibration, as shown in FIG. It may be short. FIG.
Is a view of the inside of a cut metal case 19, wherein the judging means 12 is constituted by a circuit on a substrate 20.

FIG. 4 is a structural view of the piezoelectric sensors 10 and 11. The piezoelectric sensors 10 and 11 are composed of a composite piezoelectric layer 21 as a piezoelectric material, a center electrode 22 and an outer electrode sandwiching the composite piezoelectric layer 21. 23 is formed in a coaxial cable shape formed by concentrically laminating the layers 23 and 23, a protective coating layer 24 is provided on the outermost layer, and the overall configuration is extremely excellent in flexibility. The composite piezoelectric layer 21 is made flexible by mixing, for example, a chlorinated polyethylene sheet made of a mixture of amorphous chlorinated polyethylene and crystalline chlorinated polyethylene and a piezoelectric ceramic (for example, lead zirconate titanate) powder. It is possible to issue

The center electrode 22 may be an ordinary single metal wire, but here an electrode in which a metal coil 26 is wound around an insulating polymer fiber 25 is used. Outer electrode 23
Uses a strip electrode in which a metal film such as aluminum is adhered on a polymer layer such as polyethylene terephthalate, and partially overlaps the composite piezoelectric layer 21 so as to partially shield it from electric noise in an external environment. It is wound around. The covering layer 24 is made of a material having more flexibility and flexibility than the composite piezoelectric layer 21 such as ethylene propylene rubber (EPDM) and chloroprene rubber ( An elastic material such as CR), butyl rubber (IIR), silicon rubber (Si), and thermoplastic elastomer is used.

FIG. 5 is a block diagram of the judging means 12.
The output of the first piezoelectric sensor 10 is output to a first output processing unit 27.
The output of the second piezoelectric sensor 11 is processed by the second output processing means 28 so that the output characteristics with respect to vibration are substantially the same. Specifically, the output processing means 2
7 and 28 have impedance converters 29 and 30, filters 31, 32, and amplifiers 33 and 34, which are composed of input resistors and FETs. Outputs of the amplifiers 33 and 34 (that is, outputs from the output processing units 27 and 28) are transmitted to the comparison unit 36 after subtracting the difference by the subtraction unit 35 and canceling the output due to vibration. The comparing unit 36 includes the subtracting unit 3
5 is compared with a reference signal to determine the presence or absence of pinching, and the determination output is transmitted to the control means 14. Generally, a piezoelectric sensor has a high output impedance,
If the variation in the connection is large, the variation in the signal level in the subsequent signal processing circuit is also large, and it is conceivable that the signal level is weak to noise. ing. Further, the piezoelectric sensor has characteristics similar to a capacitor electrically, and the capacitance and the sensitivity change depending on the length.
In the present embodiment, since the lengths of the piezoelectric sensors 10 and 11 are different, there is a difference in the capacity and the sensitivity. Therefore, the filters 31 and 32 and the amplifiers 33 and 34 are intentionally made to have different characteristics, thereby canceling out differences in capacitance and sensitivity, and processing so that the output characteristics of the amplifiers 33 and 34 with respect to vibration become substantially the same.

Next, the operation will be described with reference to FIG.
FIG. 6 is a time chart.
V1, the output V2 of the amplifier 34, the output Vs of the subtraction unit 35, the output J of the comparison unit 36, and the control unit 14
FIG. 7 is a characteristic diagram showing an applied voltage Vm for giving a drive signal to the IGBT. First, a case where there is no vibration of the vehicle body (particularly, the opening / closing portion) will be described. At time t1, a voltage of + Vd is applied to Vm of the motor 15 to move the sliding roof 6 in the closing direction.

At this time, when an object is sandwiched between the roof frame 7 and the sliding roof 6, the first piezoelectric sensor 10 is pressed and deformed. Signal is the reference potential Vo1 of V1.
It is output as a larger signal component. At this time, if the configuration is such that the piezoelectric sensor 10 is simply arranged, the displacement at the time of sandwiching is slight, but in the case of the present embodiment, the piezoelectric sensor 1
0 has flexibility, is disposed on the sliding roof 6 via an elastic sealing member 9, and has a gap 16 in the sealing member 9, so that the pinching In this case, the displacement of the piezoelectric sensor 10 increases.

Therefore, a large displacement is obtained in the piezoelectric sensor 10 during the sandwiching, and the acceleration, which is the second derivative of the displacement, also increases. As a result, V1 also increases. However, at this time, since the second piezoelectric sensor 11 is prevented from contacting by the rigid body 17, no output is obtained for the pinch,
Does not change from the reference potential Vo2. Therefore, only the change of V1 appears as Vs of the subtracting unit 35.

If the amplitude | Vs−Vo3 | of Vs from reference potential Vo3 is equal to or greater than predetermined value Do, J of comparison section 36 determines that pinching has occurred, and at time t2, determination output J
To output a pulse signal of Lo → Hi → Lo. Upon receiving this pulse signal, the control means 14 stops applying the voltage of + Vd to Vm of the motor 15, applies the voltage of -Vd for a certain time (between t2 and t3), and opens the sliding roof 6 by a certain amount. Direction to release the pinching. At the time of releasing the entrapment, the first piezoelectric sensor 10 also outputs a signal (a signal component smaller than the reference potential Vo1 of V1 in FIG. 6) according to the acceleration at which the displacement is restored.

Next, a case will be described in which a large vibration is generated in the vehicle body (particularly, the opening / closing portion) due to running on a rough road or the like.
When the vehicle travels on a rough road after time t4, large vibrations are generated in the vehicle body, and both V1 and V2 generate outputs corresponding to the vibrations.
When the sliding roof 6 is moved in the closing direction by applying a voltage of + Vd to Vm at time t5, if an object is sandwiched between the roof frame 7 and the sliding roof 6 before closing, V1 is caused by vibration. Although the output and the output due to the pinching are combined, it is not possible to know when the pinching has occurred only with V1. If | V1−Vo1 | is equal to or more than the predetermined value Do and it is determined that the entrapment has occurred, it is possible to determine that the entrapment has occurred without any entrapment after the output due to the vibration occurs (between t4 and t5). Despite this, an erroneous determination is made.

However, in this embodiment, since the second piezoelectric sensor 11 is determined by Vs, which is the difference between V1 and V2, since the second piezoelectric sensor 11 is covered with a rigid body, it does not generate an output due to pinching but only an output due to vibration. And the piezoelectric sensor 1
0 and 11 are arranged only on the side of the sliding roof 6 which is a common member, so that the same movement is performed with respect to the vibration under the same vibration condition. In Vs, the output due to the vibration is accurately canceled, and the output due to the vibration is canceled out. Only the signal is obtained.

Therefore, regardless of the presence or absence of vibration, the judging means 12 judges that jamming has occurred if the amplitude | Vs−Vo3 | from the reference potential Vo3 is equal to or greater than the predetermined value Do, and the time t
At step 6, a pulse signal of Lo → Hi → Lo is output as the judgment output J. The control means 14 stops applying + Vd voltage to Vm of the motor 15 when receiving this pulse signal,
A voltage of Vd is applied for a certain period of time (between t6 and t7) to move the sliding roof 6 in the opening direction by a certain amount, so that the sandwiching can be released.

The sliding roof 6 is movable relative to the roof frame 7, and the sliding roof 6 generates vibration different from that of the roof frame 7 due to rattling of the drive shaft of the motor 15. When closed, the sealing member 9 has an effect of bringing the sliding roof 6 and the roof frame 7 into close contact with each other, but when the sandwiching is detected, the sealing member 9 is also shifted because the sliding roof 6 is shifted from the roof frame 7. It is not effective and cannot stop the generation of different vibrations. However, in this embodiment, the piezoelectric sensors 10 and 11 are supported and fixed only to the sliding roof 6. With this configuration, the piezoelectric sensors 10 and 11 can be easily arranged under the same vibration conditions.

As described above, the pinch determination device of this embodiment correctly determines the presence / absence of pinch even when there is external vibration, so that the safety and reliability of the opening / closing operation of the electric sunroof can be improved.

(Embodiment 2) FIGS. 7 and 8 show a pinch determination device and an opening / closing device according to Embodiment 2 of the present invention.
It shows an example applied to a power window of an automobile.

Referring to FIG. 7, an opening / closing section 41 is formed on a door 37 of an automobile by a window glass 39 serving as a moving member and a window frame 40 serving as an abutting member in order to form a power window 38 serving as a typical opening / closing device. And a weather strip 42 as a sealing member for closing a gap between the window glass 39 and the window frame 40 when the window glass 39 contacts the window frame 40 to close the opening / closing section 41. It is worn along.

In the weather strip 42, there is provided a first piezoelectric sensor 10 which generates an output by being deformed when an object is inserted into the opening / closing section 41, a second piezoelectric sensor 11 for detecting vibration, and a judging means. 12 and the like are arranged inside the door 37 so as not to be easily touched. The window glass 39 and the window frame 40 forming the opening / closing section 41, the piezoelectric sensors 10, 11 and the determination means 12 can be considered as a pinch determination device 13. The output of the judging means 12 is transmitted to the control means 14, which outputs a control signal to the motor 15.
Moves. Entrapment determination device 13, control means 14,
A power window 38 is formed by the motor 15.

FIG. 8 is an enlarged view of a cross section of the first piezoelectric sensor 10 and the second piezoelectric sensor 11. In the present embodiment, the second piezoelectric sensor 11 is configured to be seen in a piezoelectric buzzer or the like. That is, electrodes 44 and 45 are formed on both surfaces of a plate-shaped piezoelectric ceramic 43 and integrated on a metal plate 46. In addition, the second piezoelectric sensor 11 is attached via an adhesive 48 to a support table 47 which is firmly fixed to the window frame 40 by a method such as welding, caulking or screwing.

In the present embodiment, by arranging the second piezoelectric sensor 11 in the door 37, contact of an object with the second piezoelectric sensor 11 can be prevented without covering with a rigid body. An output corresponding to only vibration is obtained from the piezoelectric sensor 11. Further, in the present embodiment, the first piezoelectric sensor 10 is provided on the window frame 40 and the second piezoelectric sensor 11 is provided on the support base 47, and is not necessarily provided on the same member. However, since the support table 47 is firmly fixed to the window frame 40, the vibration conditions can be made extremely close. Therefore, the output due to vibration can be accurately canceled by the first piezoelectric sensor 10 and the second piezoelectric sensor 11, and the presence / absence of entrapment can be correctly determined.

As described above, the pinching determination device of the present embodiment correctly determines the presence or absence of pinching even when there is external vibration, so that the safety and reliability of the power window opening / closing operation can be improved.

(Embodiment 3) FIGS. 9 to 11 show an entrapment judging device and an opening / closing device according to Embodiment 3 of the present invention, and show an example applied to an electric sliding door of an automobile.

9 and 10, in order to form an electric slide door 49 which is a typical opening / closing device of an automobile, an opening / closing section 52 is constituted by a sliding door 50 which is a moving member and a vehicle body 51 which is a contact member. Further, an elastic body 53 is provided along the end of the slide door 50. The elastic body 53 is mounted on a support member 54, and the opening / closing section 5 is provided in the elastic body 53.
The first piezoelectric sensor 10 that is deformed by the object being sandwiched between the two and generates an output is mounted, and the second piezoelectric sensor 11
Are disposed directly on the support member 54.

Further, both the first piezoelectric sensor 10 and the second piezoelectric sensor 11 transmit signals to the judging means 12. Here, the first piezoelectric sensor 10 and the second piezoelectric sensor 11 have exactly the same shape, and are both supported and fixed under the same vibration conditions. However, the difference between the two is that the second piezoelectric sensor 11 is different from the first piezoelectric sensor in that the coating layer 24 itself is made of a rigid body as shown in FIG. The difference is that it is opposite to 10.

Then, the sliding door 50 forming the opening / closing section 52, the vehicle body 51, the piezoelectric sensors 10 and 11, the determination means 1
2 can be considered as the pinch determination device 13. The output of the determination means 12 is transmitted to the control means 14, which outputs a control signal to the motor 15, and the operation of the motor 15 causes the slide door 50 to move. An electric slide door 49 is formed by the pinch determination device 13, the control unit 14, and the motor 15.

FIG. 10 is a diagram showing a state where an object 55 is sandwiched in the opening / closing section 52. The object 55 is an elastic body 53
It can be seen that the first piezoelectric sensor 10 in the elastic body 53 is locally deformed to generate an output because the first piezoelectric sensor 10 in the elastic body 53 is locally deformed. On the other hand, since the coating layer itself is made of a rigid body, the second piezoelectric sensor 11 can generate only an output due to vibration without generating a pinching output even if an object comes into contact with the object.

FIG. 11 is a block diagram of the judging means 12, in which the adding section 5 for adding the outputs of the piezoelectric sensors 10 and 11 is used.
7, an impedance conversion unit 58, a filter 59, an amplifier 60, a comparison unit 36, and the like. In the present embodiment, since the polarities of the piezoelectric sensors 10 and 11 are opposite, an output having the opposite sign is generated with respect to the same vibration.
Since the output characteristics (capacitance, absolute value of sensitivity) with respect to vibration become the same because the shapes of 0 and 11 are the same, there is an effect that it is not necessary to separately provide output processing means such as a filter and an amplifier.

As described above, the pinching determination device of the present embodiment correctly determines the presence or absence of pinching even when there is external vibration, so that the safety and reliability of the opening / closing operation of the electric slide door can be improved.

In this embodiment, the piezoelectric sensors 10 and 1
Although the polarity of the composite piezoelectric layer 1 is reversed, it is conceivable to reverse the connection between the center electrode and the outer electrode while maintaining the same polarity. In this case, as a manufacturing process of the piezoelectric sensor, in a case where a long-sized piezoelectric sensor is formed, polarized at once, and then cut, there is an effect that the number of times of polarization in the process can be reduced and efficiency can be improved.

The configurations of the above embodiments are not limited to each other, but may be combined. For example, the cable-shaped second piezoelectric sensor shown in the first embodiment may be made of a plate-shaped piezoelectric ceramic as shown in the second embodiment.

In the above embodiment, an electric sunroof, a power window, and an electric sliding door of an automobile have been described as opening / closing devices. However, the opening / closing apparatus may be used for, for example, a power seat. Or an automatic door, or a shutter of a garage or a store. The present invention can be applied as long as there is a risk that an object may be pinched by the opening / closing part. Of course, in the case of an elevator door or the like, the opening / closing section is constituted by two facing moving members, but the present invention can be applied by considering one as a moving member and the other as a contact member.

In the above embodiment, only one example of the first piezoelectric sensor and one example of the second piezoelectric sensor are described, but the present invention is not limited thereto. For example, there is a method in which a plurality of second piezoelectric sensors are provided. When the length of the first piezoelectric sensor is long, it is easily conceivable to arrange short piezoelectric members of the second type everywhere to obtain the average value of the vibration.

[0051]

As described above, according to the invention as set forth in any one of the first to eighth aspects, when a pinch occurs when there is an external vibration in the opening / closing section, the first piezoelectric sensor is pinched. The second piezoelectric sensor generates an output only by the external vibration while the output is generated by both the external vibration and the external vibration. Therefore, the determination unit distinguishes the output component by the external vibration and the output component by the entrapment from the output of both. This makes it possible to correctly determine the presence or absence of entrapment even when external vibration is present.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a configuration of a pinch determination device and an opening / closing device according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a perspective view showing a configuration of a determination unit of the apparatus.

FIG. 4 is a perspective view showing a configuration of a piezoelectric sensor of the device.

FIG. 5 is a block diagram of a determination unit of the apparatus.

FIG. 6 is a characteristic diagram of the apparatus.

FIG. 7 is a configuration diagram of an entrapment determination device and an opening / closing device according to a second embodiment of the present invention.

FIG. 8 is a configuration diagram of a first piezoelectric sensor and a second piezoelectric sensor of the device.

FIG. 9 is a perspective view illustrating a configuration of a pinch determination device and an opening / closing device according to a third embodiment of the present invention.

FIG. 10 is a configuration diagram when an object is sandwiched in the device.

FIG. 11 is a block diagram of a determination unit of the apparatus.

FIG. 12 is a configuration diagram of a conventional power window.

[Explanation of symbols]

 Reference Signs List 5 electric sunroof (opening / closing device) 6 sliding roof (moving member) 7 roof frame (contact member) 8, 41, 52 opening / closing section 10 first piezoelectric sensor 11 second piezoelectric sensor 12 determining means 13 pinching determining device 14 Control means 15 Motor (drive means) 17 Rigid body (contact prevention means) 27 First output processing means 28 Second output processing means 38 Power window (opening / closing device) 39 Window glass (moving member) 40 Window frame (contact member) 49) Electric sliding door (opening / closing device) 50 Sliding door (moving member) 51 Body (contact member) 55 Object

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Naofumi Nakatani 1006 Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F term (reference) 2E052 AA01 AA04 AA08 AA09 CA06 EA14 EA16 EB01 EC01 GA08 GB06 GB13 GC06 GD03 GD09 HA01 KA13 LA08 2G064 BA02 BA21 BA28 BD18 BD21 BD75 CC05 CC13 CC22 CC54 3D127 AA02 BB01 CB05 CC06 DF04 DF08 DF35 DF36 FF05 FF06 FF14

Claims (8)

[Claims] An opening / closing section comprising a moving member and a contact member; a first piezoelectric sensor for generating an output when an object is sandwiched between the opening / closing section; and an output for generating an output by vibration of the opening / closing section. An entrapment determination device comprising: a second piezoelectric sensor; and a determination unit configured to determine the presence or absence of entrapment based on an output of the first piezoelectric sensor and an output of the second piezoelectric sensor. 2. The pinch determination device according to claim 1, wherein the determination unit determines whether or not the pinch has occurred based on a difference between an output of the first piezoelectric sensor and an output of the second piezoelectric sensor. 3. The determining means includes first output processing means for processing an output of the first piezoelectric sensor, and second output processing means for processing an output of the second piezoelectric sensor. The pinching determination device according to claim 2, wherein the presence or absence of pinching is determined based on a difference between an output of the first output processing unit and an output of the second output processing unit. 4. The pinch determination device according to claim 1, wherein the first piezoelectric sensor and the second piezoelectric sensor are disposed under the same vibration condition. 5. The pinch determination device according to claim 4, wherein the first piezoelectric sensor and the second piezoelectric sensor are disposed only on one of the moving member and the contact member. 6. The pinch determination device according to claim 1, further comprising contact prevention means for preventing an object from contacting the second piezoelectric sensor. 7. The pinching determination device according to claim 6, wherein the contact prevention means has a rigid body, and the rigid body covers the second piezoelectric sensor to prevent an object from contacting the second piezoelectric sensor. 8. An entrapment determination device according to claim 1, comprising: a driving unit that drives a moving member; and a control unit that controls the driving unit based on the determination by the entrapment determination device. If the entrapment determination device determines that entrapment is present while the opening / closing part is moving in the closing direction, the control means stops the movement of the moving means or reverses the moving direction and moves the moving means in the opening direction. Switchgear to control the switchgear.