JP2004210124A - Mounting structure of pressure sensitive sensor and open/close device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting structure of a pressure sensitive sensor capable of surely and quickly detecting the generation of pinching even at an inclined part and a corner of a window frame, and making the mounting number of pressure sensitive sensors single. <P>SOLUTION: The pressure sensitive sensor 17 is disposed on at least either an opening 13 having an inclined side and the other side connected to the inclined side through the corner or an open/close member 15 opening/closing the opening 13, and detects the pinching of an object between the opening 13 and the open/close member 15. The pressure sensitive sensor 17 is formed in a long shaft shape by a piezoelectric element material having flexibility and outputting an electric signal according to deformation acceleration at the time of elastic deformation. It is provided by being pierced by the elastic support member supported by either the opening 13 or the open/close member 15. The continuous single pressure sensitive sensor 17 is provided by being pierced by the elastic support means of an area including the inclined side and the other side. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a pressure-sensitive sensor mounting structure and a switchgear suitable for use in a power window device or the like of an automobile that requires a function of preventing an object from being pinched.
[0002]
[Prior art]
2. Description of the Related Art In recent years, a so-called power window device that opens and closes using a driving force of a motor has been used as a window glass opening / closing device of a vehicle. In this power window device, when the window glass is closed, for example, when a finger or the like is likely to be erroneously pinched between the window frame and the window glass, the closing operation of the window glass is stopped or the opening operation is performed. Some devices are equipped with a pinch detection device that avoids damage to fingers and the like due to the transition.
[0003]
As a pinch detection device for this type of power window device, as shown in FIGS. 15A and 15B, conductive contact wires 202, 203, A sensor has been proposed in which a pressure-sensitive sensor 210 in which 204 and 205 are arranged to face each other is embedded in an elastic supporting means provided along the edge of a window frame (for example, see Patent Document 1).
[0004]
[Patent Document 1]
JP 2001-153734 A
[0005]
When the elastic cylinder 201 is crushed by a certain amount or more due to pinching of an object, the pressure-sensitive sensor 210 contacts the opposing conductive contact wires in the elastic cylinder 201 as shown in FIG. And outputs a predetermined detection signal.
[0006]
[Problems to be solved by the invention]
However, in the pinch detection device using the above-described pressure-sensitive sensor 210, in order to lay along the corner of the window frame of the front seat of the vehicle, for example, the pressure-sensitive sensor 210 is aligned with the corner of the window frame. When bent as shown in FIG. 16 (a), the elastic cylindrical body 201 is crushed at the bent position, and as shown in FIG. 16 (b), there is a possibility that the contact wires come into contact with each other to cause erroneous detection. . Therefore, in the related art, the pressure-sensitive sensor 210 is independently provided for each substantially linear side constituting the window frame so that one pressure-sensitive sensor 210 is not laid across the corner of the window frame. Like that.
[0007]
However, such a pressure-sensitive sensor mounting structure has a problem that the number of pressure-sensitive sensors 210 to be used increases, and it takes time to connect lead wires from each of the pressure-sensitive sensors 210.
In such a mounting structure of the pressure-sensitive sensor, since the pressure-sensitive sensor does not exist at the corner of the window frame itself, the detection of the entrapment is not performed with respect to the local entrapment of the object at the corner of the window frame. It may not be possible.
[0008]
Furthermore, in the above-described pressure-sensitive sensor 210, even if the cross section of the pressure-sensitive sensor 210 is crushed due to the pinching of an object, contact between the contact wires does not occur until the cross-section is crushed to a certain degree or more. As a result, there is a problem that the stoppage of the closing operation of the window glass is delayed.
[0009]
When the window frame has an inclined side such as an opening / closing door of a front seat of a vehicle, the pressure-sensitive sensor 210 disposed on the inclined side has a direction in which the cross section of the pressure-sensitive sensor 210 is deformed when an object is pinched. The acting force is a component force smaller than the rising force of the window glass sandwiching the object. As a result, the elastic cylinder 201 is not sufficiently elastically deformed. Was.
[0010]
The present invention has been made in view of the above-described problems, and an object of the present invention is to be able to reliably and quickly detect the occurrence of entrapment even at an inclined portion or a corner of a window frame. An object of the present invention is to provide a pressure-sensitive sensor mounting structure and an opening / closing device which can simplify the processing of lead wires from the pressure-sensitive sensor by using only one pressure sensor.
[0011]
[Means for Solving the Problems]
The above object is achieved by a pressure-sensitive sensor mounting structure and a switching device having the following configurations.
(1) An opening having an inclined side and another side connected to the inclined side via a corner, and an opening / closing member for opening / closing the opening are provided in at least one of the opening and the opening / closing member. A mounting structure of a pressure-sensitive sensor for detecting the pinching of an object between the pressure-sensitive sensors, wherein the pressure-sensitive sensor is formed in a flexible and elongated shape, and any one of the opening or the opening and closing member is provided. A pressure-sensitive sensor mounting structure, wherein the pressure-sensitive sensor mounting structure is provided so as to be inserted into elastic support means for supporting the pressure-sensitive sensor, and is disposed at least on an inclined side of the opening.
(2) An opening having an inclined side and another side connected to the inclined side via a corner, and an opening / closing member for opening / closing the opening are provided in at least one of the opening and the opening / closing member. A mounting structure for a pressure-sensitive sensor that detects the pinching of an object between the pressure-sensitive sensors, wherein the pressure-sensitive sensor is formed in a flexible and elongated shaft shape, and is provided with any of the opening or the opening and closing member. A single continuous pressure-sensitive sensor is inserted through the elastic support means in a region including the inclined side and the other side. The mounting structure of the pressure sensor.
(3) The mounting structure of the pressure-sensitive sensor according to (1) or (2), wherein the pressure-sensitive sensor outputs an electric signal according to a deformation acceleration during elastic deformation.
(4) The piezoelectric element material of the pressure-sensitive sensor is formed of a composite piezoelectric material in which chlorinated polyethylene and piezoelectric ceramic powder are mixed, and any one of (1) to (3). Mounting structure of pressure sensor.
(5) The mounting structure for a pressure-sensitive sensor according to any one of (1) to (4), wherein a surface of the elastic means is subjected to a high friction treatment.
(6) The pressure-sensitive device according to any one of (1) to (4), wherein the whole or a part of the surface of the elastic supporting means is a surface exposing a material surface having no coating layer. Sensor mounting structure.
(7) The pressure-sensitive sensor mounted by the pressure-sensitive sensor mounting structure according to any one of (1) to (6), and contact of an object with the pressure-sensitive sensor based on an output signal of the pressure-sensitive sensor. Determining means for determining the presence / absence of, opening / closing driving means for operating the opening / closing member to open / close the opening, and when the determining means determines that there has been contact with an object based on an electric signal from the pressure sensor. Control means for controlling the opening / closing drive means so as to stop the operation of the opening / closing member or to start the opening operation of the opening / closing member.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a mounting structure of a pressure-sensitive sensor and an opening / closing device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is an external view of a pinch detection device 100 and an opening / closing device 150 equipped with a pressure-sensitive sensor according to the mounting structure of the pressure-sensitive sensor according to the present invention, and shows an example in which the invention is applied to a power window device of an automobile. FIG. 2 is a sectional view taken along line AA of FIG. In FIG. 2, the right side of the drawing is the vehicle interior side, and the left side is the vehicle interior side.
[0013]
The basic configuration of the pinch detection device 100 is as follows. In FIG. 1, reference numeral 11 denotes an automobile door, 13 denotes a window frame as an opening, and 15 denotes a window glass as an opening / closing member. Reference numeral 17 denotes a pressure-sensitive sensor, which is disposed on the edge of the window frame 13. Reference numeral 19 denotes a judging means for judging the contact of the object with the pressure sensor 17 based on the output signal of the pressure sensor 17.
[0014]
Further, the opening / closing device 150 of the present embodiment includes the above-described pinch detection device 100, an opening / closing drive unit 21 for opening and closing the window glass 15, and an opening / closing control unit 23 for controlling the opening / closing drive unit 21. Here, the opening / closing drive means 21 includes a motor 25, a wire 27, a support 29 of the window glass 15, a guide 31, and the like. The structure is such that the window glass 15 is opened and closed by moving the wire 27 by the motor 25 and moving the support 29 connected to the wire 27 up and down along the guide 31.
The opening / closing drive means 21 is not limited to the method using the wire 27 as described above, but may be another method. Further, the opening / closing control means 23 may be integrated with the motor 25.
[0015]
As shown in FIG. 2, the pressure-sensitive sensor 17 of the present embodiment has an elastic support having a flexible piezoelectric element material 33 as a pressure-sensitive means and a hollow portion 42 through which the piezoelectric element material 33 is inserted and supported. Means 35.
The elastic support means 35 is formed of an elastic body such as a synthetic rubber or a foamed resin member, and has a function as a packing due to close contact with the window glass 15 and a function as a buffer for a contact portion of the window glass 15. It is mounted along the edge of the window frame 13, and a hollow portion 42 for inserting the piezoelectric element material 33 is provided near the lowermost portion thereof.
In the figure, reference numeral 14 denotes a weather strip provided on the window frame 13.
[0016]
FIG. 3 is a sectional view of the piezoelectric element material 33. The piezoelectric element material 33 is composed of a center electrode 45 as an electrode for signal derivation, an outer electrode 47, and a composite piezoelectric layer made of a composite piezoelectric material obtained by mixing a sintering powder of piezoelectric ceramic with a rubber elastic body made of chlorinated polyethylene. 49 and the coating layer 51 are concentrically laminated, formed into a cable shape (that is, a long shaft shape), and subjected to a polarization treatment, and have excellent flexibility and deformation during deformation. An output signal corresponding to the acceleration is generated. As the piezoelectric ceramic, for example, lead titanate or sintered powder of lead zirconate titanate is used.
[0017]
The above-described piezoelectric element material 33 is manufactured by the following steps. First, a chlorinated polyethylene sheet and 40 to 70% by volume of piezoelectric ceramics (here, lead zirconate titanate) powder are uniformly mixed into a sheet by a roll method. After the sheet is finely cut into pellets, these pellets are continuously extruded together with the center electrode 45 to form the composite piezoelectric layer 49. Then, the outer electrode 47 is wound around the composite piezoelectric layer 49. The coating layer 51 surrounding the outer electrode 47 is also continuously extruded. Finally, a DC high voltage of 5 to 10 kV / mm is applied between the center electrode 45 and the outer electrode 47 to polarize the composite piezoelectric layer 49.
[0018]
When adding the piezoelectric ceramic powder to the chlorinated polyethylene, it is preferable that the piezoelectric ceramic powder be immersed and dried in a solution of a titanium coupling agent in advance. By this treatment, the surface of the piezoelectric ceramic powder is covered with the hydrophilic groups and the hydrophobic groups contained in the titanium coupling agent.
The hydrophilic group prevents aggregation of the piezoelectric ceramic powders, and the hydrophobic group increases the wettability between the chlorinated polyethylene and the piezoelectric ceramic powder. As a result, the piezoelectric ceramic powder can be uniformly added to the chlorinated polyethylene in a large amount up to 70% by volume. It has been found that the same effect as described above can be obtained by adding the titanium coupling agent at the time of rolling the chlorinated polyethylene and the piezoelectric ceramic powder instead of immersion in the titanium coupling agent solution. This treatment is excellent in that no special immersion treatment in a titanium coupling agent solution is required. Thus, the chlorinated polyethylene also plays a role as a binder resin when mixing the piezoelectric ceramic powder.
[0019]
As the center electrode 45, a normal metal single wire may be used, but here, an electrode in which a metal coil is wound around an insulating polymer fiber is used. As the insulating polymer fiber and the metal coil, a polyester fiber and a copper alloy containing 5 wt% of silver, which are commercially used in an electric blanket, are preferable.
[0020]
The outer electrode 47 has a configuration in which a band-shaped electrode in which a metal film is adhered on a polymer layer is used and wound around the composite piezoelectric layer 49. An electrode having polyethylene terephthalate (PET) as the polymer layer and an aluminum film adhered thereon has high thermal stability at 120 ° C. and is mass-produced commercially. It is preferable as the outer electrode 47. When connecting this electrode to the determination means 19, for example, it can be connected by caulking or eyelets. Further, a configuration may be adopted in which a metal single-wire coil or a metal braided wire is soldered to the determination means 19 around the aluminum film of the outer electrode 47, and the soldering becomes possible, so that the operation can be made more efficient. In order to shield the piezoelectric element material 33 from electric noise in the external environment, the outer electrode 47 is preferably wound around the composite piezoelectric layer 49 so as to partially overlap.
[0021]
As the coating layer 51, vinyl chloride or polyethylene may be used, but rubber such as rubber having more flexibility and flexibility than the composite piezoelectric layer 49 is used so that the piezoelectric element material 33 is easily deformed on a thick ground where an object fits. Elastic materials may be used. It is preferable to select an in-vehicle component in consideration of heat resistance and cold resistance. Specifically, it is preferable to select an in-vehicle component that has a small decrease in flexibility at −30 ° C. to 85 ° C. As such a rubber, for example, ethylene propylene rubber (EPDM), chloroprene rubber (CR), butyl rubber (IIR), silicon rubber (Si), thermoplastic elastomer, or the like may be used. With the above configuration, the minimum curvature of the piezoelectric element material 33 can be up to a radius of 5 mm.
[0022]
As described above, since the composite piezoelectric material of the piezoelectric element material 33 has both the flexibility of chlorinated polyethylene and the high-temperature durability of piezoelectric ceramics, a conventional piezoelectric sensor using polyvinylidene fluoride as the piezoelectric body is used. There is an advantage that the sensitivity is not lowered at a very high temperature, the durability at a high temperature is good, and the vulcanization step is not required at the time of molding, unlike rubber such as EPDM, so that production efficiency is high.
[0023]
FIG. 4 is an external view of the piezoelectric element material 33, and a disconnection detecting resistor 55 is built in one end 53 of the piezoelectric element material 33. The disconnection detecting resistor 55 is connected between the center electrode 45 and the outer electrode 47 of the piezoelectric element material 33. The disconnection detecting resistor 55 also serves as a discharge unit that discharges the electric charge generated in the piezoelectric element material 33 by the pyroelectric effect, thereby streamlining the parts. The piezoelectric element material 33 is directly connected to the judging means 19, and the piezoelectric element material 33 and the judging means 19 are integrated. Further, a cable 57 for supplying power and outputting a detection signal, and a connector 59 are connected to the determination means 19. When the piezoelectric element material 33 is disposed on the elastic support means 35, a disconnection detecting resistor 55 is built in the end 53, and after inserting the piezoelectric element material 33 into the hollow portion 42 of the elastic support means 35, The material 33 and the judging means 19 are connected and integrated.
When the elastic supporting means 35 is formed by the extrusion molding method, the piezoelectric element material 33 is simultaneously extruded, and the piezoelectric element material 33 is disposed on the elastic supporting means 35. May be incorporated, and the piezoelectric element material 33 and the determination means 19 may be integrated.
[0024]
FIG. 5 is a block diagram of the pinch detection device 100 and the opening / closing device 150 according to the present embodiment.
The judging means 19 includes a voltage dividing resistor 61 used for detecting a disconnection of the pressure-sensitive sensor 17, a filtering section 62 for passing only a predetermined frequency component from an output signal from the piezoelectric element material 33, and a filtering section 62. A determination unit 63 for determining the contact of the object with the pressure-sensitive sensor 17 based on the output signal from the sensor, the central electrode 45 of the piezoelectric element material 33 from the voltage value formed in the disconnection detecting resistor 55 and the voltage dividing resistor 61. And an abnormality determining unit 64 for determining the elasticity of the outer electrode 47 or more.
Further, the center electrode 45 and the outer electrode 47 are connected to the judging means 19, and a signal input section 65 for inputting an output signal from the piezoelectric element material 33 to the judging means 19, and a signal output for outputting a judging signal from the judging section 63. The unit 66 is disposed adjacent to the judgment unit 19. The signal output unit 66 is also connected to a power line and a ground line to the determination unit 19. Further, the judging means 19 has a bypass section 67 such as a capacitor provided between the signal input section 65 and the signal output section 66 to bypass a high-frequency signal.
[0025]
The driving means 21 has a Hall element 68 for detecting a rotation pulse of the motor 25.
The opening / closing control means 23 includes a position detection unit 71 that detects the upper end position of the window glass 15 based on an output signal from the hall element 68, and a moving speed of the window glass 15 based on an output signal from the hall element 68 to detect the moving speed of the window glass 15. An opening / closing section contact determining section 72 that determines contact of an object with the glass 15 and a control section 73 that controls the motor 25 based on output signals from the determining means 19, the position detecting section 71, and the opening / closing section contact determining section 72. ing.
[0026]
The position detecting section 71 detects the current position of the upper end of the window glass 15 by counting and storing the pulse signals output from the Hall element 68. Here, the upper end position Y of the window glass 15 is represented by a height from the lowest point of the window frame 13 as shown in FIG.
[0027]
The opening / closing portion contact determination unit 72 calculates the moving speed of the window glass 15 from the pulse interval of the pulse signal output from the Hall element 68 based on the fact that the moving speed of the window glass 15 decreases when an object comes into contact with the window glass 15. If the calculated amount of change | ΔVw | of the moving speed per unit time is larger than a preset value VW1, it is determined that the window glass 15 has come into contact with an object, and a Lo → Hi → Lo pulse signal is output. Is output.
[0028]
The opening / closing control unit 23 is connected to a notifying unit 74 for notifying the determination result of the determining unit 19 with a predetermined light or the like installed on a front panel in the vehicle compartment, and an opening / closing switch 75 for opening and closing the window glass 15. The open / close switch 75 includes an auto-up switch and an auto-down switch for opening and closing the window glass 15 by one-touch operation, and a manual up switch and a manual down switch for opening and closing the window glass 15 by manual operation. In addition, a power supply 76 such as a battery of an automobile that supplies power through the determination unit 19 is provided.
[0029]
The filtering unit 62 removes unnecessary signals due to vibration of the vehicle body of the automobile from the output signal of the piezoelectric element material 33, and when the piezoelectric element material 33 is deformed by pressing by contact with an object, the filter element 62 It has a filtering characteristic of extracting only a specific frequency component appearing in the output signal. In order to determine the filtering characteristics, the vibration characteristics of the vehicle body of the automobile and the vehicle body vibration during traveling may be analyzed and optimized.
[0030]
In order to remove extraneous electrical noise, the determination means 19 is entirely covered with a shield member and is electrically shielded. Further, the outer electrode 47 is electrically shielded from the shield member of the determination means 19, and the pressure-sensitive sensor 17 is also electrically shielded. Note that a strong electric field countermeasure may be taken by adding a feedthrough capacitor, an EMI filter, or the like to the input / output unit of the above circuit.
[0031]
Next, a basic operation when the pinch detection device 100 detects contact of an object with the pressure-sensitive sensor 17 will be described.
FIG. 6 shows a state of the pressure-sensitive sensor 17 when an object 77 as an object enters and is sandwiched between the window frame and the window glass. When the object 77 comes into contact with the pressure-sensitive sensor 17, the pressing by the object 77 acts on the elastic support means 35 and the piezoelectric element material 33. Since the elastic support means 35 has more flexibility than the piezoelectric element material 33, the elastic support means 35 is compressed by pressing around the point where the object 77 contacts as shown in the figure, and the side wall 43 is deformed. At the same time, the hollow portion 41 is crushed. Accordingly, the piezoelectric element material 33 also bends and deforms around the point where the object 77 comes into contact with the elastic support means 35. Similar deformation occurs in the pressure sensor 17 even when the window frame including the pressure sensor 17 is gripped by hand.
[0032]
When the piezoelectric element material 33 is deformed in this way, an output signal corresponding to the acceleration of the deformation is output from the piezoelectric element material 33 by the piezoelectric effect. The output signal from the piezoelectric element material 33 is filtered by the filter 62. The output signal of the piezoelectric element material 33 may include an output signal due to an unnecessary vibration component caused by vibration of the body of the automobile or the like. The filtering unit 62 removes the unnecessary signal.
[0033]
Here, the operation procedure of the determination unit 63 and the control unit 73 will be described with reference to FIG.
FIG. 7 is a characteristic diagram showing the output signal V from the filtering unit 62, the judgment output J of the judgment unit 19, and the voltage Vm applied to the motor 25. 7, the vertical axis represents V, J, and Vm in order from the top, and the horizontal axis represents time t.
When the auto-up switch of the open / close switch 75 is turned on at time t, the control unit 73 applies a voltage of + Vd to the motor 25 to close the window glass 15. The determining means 19 performs a determining operation when the window glass 15 is closed. When the object 77 is sandwiched as shown in FIG. 6, a signal corresponding to the acceleration of the deformation of the piezoelectric element material 33 is output from the piezoelectric element material 33 due to the piezoelectric effect, and the filtering unit 62 outputs the signal shown in FIG. ) Appear as signal components larger than the reference potential V0. At this time, if the piezoelectric element material 33 is simply arranged on the window frame 13, the deformation of the piezoelectric element material 33 at the time of sandwiching is slight, but in the case of the present embodiment, as shown in FIG. In addition, since the elastic support means 35 has flexibility and the elastic support means 35 is easily compressed at the time of sandwiching, the amount of deformation of the piezoelectric element material 33 increases.
[0034]
Then, since the hollow portion 41 is also crushed at the time of sandwiching, the deformation amount of the piezoelectric element material 33 further increases. As described above, the piezoelectric element material 33 obtains a large deformation amount, and the acceleration, which is the second derivative of the deformation amount, also increases. As a result, the output signal of the piezoelectric element material 33 also increases. If the amplitude | V−V0 | of V from V0 is greater than D0, the determination unit 63 determines that there has been contact with the object 77, and as a determination output at time t2, as shown in FIG. , Lo → Hi.
[0035]
When this determination signal is received, the control unit 73 stops applying the voltage of + Vd to the motor 25, and applies the voltage of -Vd to the window glass 15 for a certain period until time t3, as shown in FIG. Is lowered by a certain amount to release the pinching or prevent the pinching from occurring. When the pressure on the pressure-sensitive sensor 17 is released, a signal (a signal component smaller than the reference potential V0 in FIG. 7A) corresponding to the acceleration at which the deformation is restored is output from the piezoelectric element material 33.
[0036]
When the pressure-sensitive sensor 17 is deformed, whether V becomes larger or smaller than V0 depends on the bending direction and the polarization direction of the piezoelectric element material 33, the allocation of the electrodes (which is the reference potential), the piezoelectric Although it changes depending on the supporting direction of the element material 33, since the determination section 63 determines the entrapment based on the absolute value of the amplitude of V from V0, the entrapment can be determined regardless of the magnitude of V with respect to V0.
[0037]
In addition to the above-described basic determination method, if the presence or absence of contact with an object as an object is determined as follows, it is possible to prevent the occurrence of entrapment.
FIG. 8 is a characteristic diagram showing the output signal V from the filtering section 62 and the judgment output J of the judging means 19. 8, the vertical axis represents V and J in order from the top, and the horizontal axis represents time t.
As shown in FIG. 8A, when the pressure-sensitive sensor 17 is deformed by grasping the window frame 13 or the like at time t4, a signal is output from the piezoelectric element material 33 by the piezoelectric effect, and as a result, the filtering unit 62 , A signal component larger than the reference potential V0 appears.
[0038]
Then, when the output signal V becomes equal to or more than the preset V1, that is, when the amplitude | V−V0 | of the output signal V from V0 becomes larger than V1, the determination unit 63 contacts the object. As shown in FIG. 8 (b), a Lo → Hi pulse signal is output as a determination output at time t4 and held.
Next, when the deformation of the pressure-sensitive sensor 17 is released by releasing the hand from the window frame 13 or the like, a signal is output from the piezoelectric element material 33 by an equivalent piezoelectric effect, and a signal smaller than the reference potential V0 is output from the filtering unit 62. A signal component appears. At this time, when the output signal V becomes equal to or less than the preset V2, that is, when the amplitude | V−V0 | of V of the output signal from V0 becomes larger than V2, It is determined that they have separated, and at time t5, the Hi-level pulse signal that is the determination signal is changed from Hi to Lo. That is, the pulse signal is held at Hi and the output of the determination signal is held between the time when the contact of the object is detected and the time when the separation is detected.
[0039]
Here, from the time t4 when the determination signal is output and the contact of the object is detected to the time t5 when the separation of the object is detected, even if the open / close switch 75 is operated to move the window glass 15 up and down temporarily, The control unit 73 controls to lock the operation of the window glass 15. As a result, it is possible to prevent the occurrence of entrapment due to the detection of an obstacle, thereby improving safety.
[0040]
The output signal V changes depending on the polarity when the piezoelectric element material 33 is polarized. In that case, the signal shown in the figure becomes a signal in which the sign is reversed, so that the set values of V1 and V2 may be reversed.
In addition, by providing the function of the determination means 19 on the side of the open / close control means 23 connected thereto, the determination means 19 is separated from the pressure-sensitive sensor 17 to improve the handling such as the installation of the pressure-sensitive sensor 17 itself. It may be.
[0041]
In the above-described pinch detection device 100 and opening / closing device 150, as shown in FIG. 9, the elastic support means 35 includes the inclined side 161 of the window frame 13 facing the upper edge of the window glass 15 and the corners thereof. The other side to be connected, that is, each of the upper horizontal sides 163 that intersects substantially horizontally with the upper end of the inclined side 161, is attached over substantially the entire length.
However, at the corner 165 of the window frame 13 where the inclined side 161 and the horizontal upper side 163 intersect, the elastic support means 35a attached to the inclined side 161 as shown in FIG. The elastic support means 35b attached to the horizontal upper side 163 at the abutting end of the elastic support means 35a and 35b, so that the respective elastic support means 35a and 35b can smoothly communicate with each other through the hollow portion 42 for inserting the piezoelectric element material. The butt end of the means is glued after being cut obliquely at a predetermined angle.
[0042]
In the pressure-sensitive sensor 17 according to the present embodiment, one long piezoelectric element material 33 is inserted into the communicating hollow portion 42 of each elastic support means 35a, 35b, and is connected to the determination means 19. Mounting structure.
[0043]
In the mounting structure of the pressure-sensitive sensor 17 thus configured, since the piezoelectric element material 33 is a single continuous form, there is no dead portion even at the corner 165 and the pressure detection of the window frame 13 is performed. Can be used as a pressure detection area without any gap. Further, since the pressure-sensitive sensor 17 is a piezoelectric element that outputs an electric signal in accordance with the deformation acceleration during elastic deformation, even when the pressure-sensitive sensor 17 is laid on the corner 165 of the window frame 13 in a bent state, the laying is performed. The bent portion of the piezoelectric element material 33 is deformed, but does not output a signal indicating pinching unless it is newly elastically deformed. Therefore, the pressure-sensitive sensor 17 can be laid without any trouble such as erroneous detection even when straddling the corner 165 such as a window frame.
[0044]
Further, since the pressure-sensitive sensor 17 is a piezoelectric element that outputs an electric signal in accordance with the deformation acceleration during elastic deformation, a conventional pressure-sensitive sensor that outputs a signal when the contact wires come into contact with each other during a certain amount of elastic deformation. Compared to 17, even with a slight elastic deformation, it is possible to quickly output a signal indicating the occurrence of the elastic deformation.
For example, as shown in FIG. 11A, when the object 167 is pinched in the range of the inclined side 161 of the window frame 13, as shown in FIG. 11B, the piezoelectric element material 33 of the inclined side 161 is formed. The component force FN in the direction orthogonal to the inclined side that causes the elastic deformation of the window glass 15 is considerably smaller than the urging force F in the closing direction of the window glass 15, and only a small elastic deformation occurs when the object 167 is pinched. However, the piezoelectric element material 33 outputs a signal corresponding to the deformation acceleration of the elastic deformation even with a slight elastic deformation, so that the determination means 19 can reliably and quickly detect the entrapment.
[0045]
That is, even when the pressure-sensitive sensor 17 of the present embodiment is laid on an inclined portion or the corner 165 of the window frame 13, it is possible to reliably and quickly detect the occurrence of the entrapment. Is continuously laid over the entire laying area on the window frame including the inclined portion and the corner 165 of the window frame, and the number of the pressure sensitive sensors 17 can be reduced to one. be able to. As a result, as shown in the above embodiment, the number of pressure-sensitive sensors 17 to be used is limited to one for one opening, and processing of signal lines from the pressure-sensitive sensor 17 is facilitated. Can be
[0046]
Further, in the present embodiment, since the pressure-sensitive sensor 17 laid in one opening is made of a single long piezoelectric element material 33, for example, as described above, an object is trapped on the inclined side 161. However, even at this time, even when the elastic deformation of the contact portion of the object is small, as shown in FIG. 12, one continuous piezoelectric element material 33 is pulled at the action position of the pressing force FN due to the contact of the object. Also, parts other than the contact part with the object are deformed from the position shown by the broken line in FIG. 12 to the periphery of the contact part as shown by the solid line, and the deformation around the contact part also outputs a signal corresponding to the deformation acceleration. Therefore, as a whole, the piezoelectric element material 33 can output a large detection signal, and can reliably and quickly detect contact with an object.
[0047]
Further, in the present embodiment, the piezoelectric element material 33 is formed of a composite piezoelectric material in which chlorinated polyethylene and piezoelectric ceramic powder are mixed, and with such a configuration, even with the action of a slight external force. Since the piezoelectric element material 33 can have the flexibility of largely deforming the cross section, the force acting when the pinch occurs, such as the inclined portion of the window frame of the front seat door of the vehicle, is smaller than the closing force of the window glass. Even when the component force is weak, a large elastic deformation is generated in the piezoelectric element material 33 when the pinching occurs, so that the pinching can be detected reliably and quickly.
[0048]
Further, in the opening / closing device 150 to which the pressure-sensitive sensor 17 is attached as described above, when an object is caught between the window glass 15 and the edge of the window frame 13 during the closing operation of the window glass 15 as the opening / closing member, Since the pressure-sensitive sensor 17 of the above-described mounting structure reliably and promptly detects the occurrence of the entrapment, and based on the detection result, the closing operation of the opening / closing member or the opening operation of the opening / closing member is immediately started. Accidents due to detection delays or detection errors can be reliably prevented.
Therefore, in a power window device or the like in which a window glass of a vehicle is opened and closed by an electric motor, it is extremely useful for preventing damage due to pinching of a finger or the like.
[0049]
Next, another embodiment according to the present invention will be described.
FIG. 13 shows a configuration example of a door portion on the rear seat side of an automobile. In FIG. 13A, a partition frame 82 is provided in addition to the window frames 81a, 81b, and 81c, and a fixed window 83 is provided between the partition frame 82 and the window frames 81a, 81b, and 81c. In this configuration, the space between the partition 81 and the guide 85 connected thereto, and the partition frame 82 and the guide 86 connected thereto is raised and lowered without any gap. In this case, the pressure sensor 17 may be provided only on the window frame 81b in order to prevent the object from being pinched.
[0050]
However, in recent years, from a design point of view, a configuration in which a partition frame is not provided is often seen as shown in FIG. In this configuration, when the window glass 84 moves up and down, a gap is formed between the window glass 84 and the window frame 81c. Therefore, it is necessary to prevent the object from being caught in this gap. However, when a conventional contact-type pressure sensor is disposed on the inclined window frame 81c, as described above, erroneous detection due to connection of a contact or a force acting on the pressure sensor 17 is caused by a partial pressure. As a result, a problem arises in that it is not possible to quickly detect the entrapment of an object.
[0051]
Therefore, by disposing the pressure-sensitive sensor of the present invention on the window frame 81c, the pressure-sensitive sensor is made of a piezoelectric element, so that even a slight elastic deformation, a signal indicating the occurrence of the elastic deformation can be output quickly. Thus, it is possible to reliably and quickly detect the pinching of the object between the window frame 81c and the window glass 84.
In addition, since the piezoelectric element material 33 of the pressure-sensitive sensor 17 of the present invention can be bent, the piezoelectric element material 33 may be provided so as to extend from the window frame 81c to the window frame 81b. It becomes possible to detect the entrapment in both areas of the frames 81b and 81c.
[0052]
The elastic support means 35 in each of the embodiments described above causes the object to slide along the direction of disposition of the pressure-sensitive sensor at the time of contact with the object, at least in the region provided at the inclined portion of the window frame. It is preferable to perform a high frictional treatment to make it difficult. This prevents the object from sliding on the surface of the elasticity indicating means 35 following the operation of the window glass.
The following are specific examples of the high friction treatment. That is, there is a method of forming a minute uneven shape simultaneously with the extrusion molding of the elastic support means 35, a method of forming the elastic support means 35 by extrusion molding, and pressing a hot mold to finish the grained surface, or a method of forming. The later elastic support means 35 can be treated by a method of roughening the surface by using a grinder, sandpaper or the like to roughen the surface. It is also possible to coat the surface of the elastic support means 35. For example, a coating layer having high friction can be formed by applying a urethane-based or epoxy-based coating material having a high static friction coefficient, a low-viscosity viscous material, or the like. Further, the material of the elastic support means 35 may be formed of a non-slip material.
[0053]
In general, when a rubber material is applied to industrial products such as automobiles, it is widely practiced to provide a low friction coating layer on the surface to reduce friction, improve aesthetics, and improve durability. Since it is preferable that the support means 35 has rather high friction, the whole or a part of the surface of the elastic support means 35 may be formed by exposing the surface of the material having no low friction coating layer. That is, at least the part where the object is to be detected is not coated with a low friction coating, and after the material processing such as extrusion molding, the surface state is kept almost as it is. Then, if necessary, a portion where an object is detected may be masked and another portion may be coated with a low friction coating. Thus, a high friction surface can be formed on the elastic support means 35 by a simple change in the manufacturing process.
[0054]
In addition, it is preferable that the above-mentioned high friction processing is performed not only on the elastic support member 35 but also on the weather strip 14 (see FIG. 2).
[0055]
The object to which the mounting structure and the opening / closing device of the pressure-sensitive sensor according to the present invention are applied is not limited to the power window device of the front seat or rear seat door of the automobile described in the above embodiment. As shown in FIG. 14, the present invention is also applicable to an electric back door window 175 in which a window glass 173 is electrically opened and closed with respect to a window frame 171 of a back door 170 of an automobile.
In addition, the present invention is not limited to a pressure-sensitive sensor disposed on a window frame of an automobile, and is applied to, for example, a sliding door on the side of the automobile body, an electric sunroof on the ceiling of the automobile, an electric hatch door on the rear of the automobile, or an electric trunk. Therefore, the same effect as described above is achieved. Further, the present invention is applicable not only to automobiles but also to trains or automatic doors of buildings.
[0056]
【The invention's effect】
According to the pressure-sensitive sensor mounting structure of the present invention, since the pressure-sensitive sensor is a piezoelectric element that outputs an electric signal in accordance with the deformation acceleration during elastic deformation, it can be laid in a bent state at a corner or the like. The bent portion for laying can be laid across a corner portion of a window frame or the like without outputting a signal indicating the pinching unless the bent portion is newly deformed by the pinching of the object. Also, since the pressure-sensitive sensor is a piezoelectric element, even if it is slight elastic deformation, the elastic deformation occurs even if it is small compared with the conventional pressure-sensitive sensor that outputs a signal when the contact wires come into contact with each other during a certain amount of elastic deformation. Can be output promptly, and, for example, even if it is laid on an inclined side of a window frame, the occurrence of entrapment can be detected reliably and quickly.
Therefore, a single long pressure-sensitive sensor is continuously laid over the entire laying area on the window frame including the inclined portion and the corner of the window frame, and the number of the pressure-sensitive sensors is single. Thus, the number of pressure sensors to be used can be reduced to one for one opening, and processing of a lead wire from the pressure sensor can be facilitated.
[0057]
Further, in the opening / closing device according to the present invention, at the time of the closing operation of the opening / closing member, when an object is caught between the opening / closing member and the edge of the opening, the pressure-sensitive sensor attached by the mounting structure of the pressure-sensitive sensor is provided. The occurrence of entrapment is reliably and promptly detected, and the closing operation of the opening / closing member is immediately stopped or the opening operation of the opening / closing member is started immediately based on the detection result. Generation can be reliably prevented.
Therefore, in a power window device or the like in which a window glass of a vehicle is opened and closed by an electric motor, it is extremely useful for preventing damage due to pinching of a finger or the like.
[Brief description of the drawings]
FIG. 1 is an external view of an embodiment of an opening / closing device equipped with a pressure-sensitive sensor according to a mounting structure of the pressure-sensitive sensor according to the present invention.
FIG. 2 is a sectional view taken along line AA of FIG.
FIG. 3 is a sectional view of a piezoelectric element material serving as a pressure-sensitive sensor according to the present invention.
FIG. 4 is an external view of a piezoelectric element material serving as a pressure-sensitive sensor according to the present invention.
FIG. 5 is a block diagram of the pinch detection device and the opening / closing device shown in FIG. 1;
FIG. 6 is a perspective view showing a deformed state of a pressure-sensitive sensor that sandwiches an object during a closing operation of an opening.
7 is a characteristic diagram showing an output signal V from a filtering unit, a determination output J of a determination unit, and a voltage Vm applied to a motor in the switchgear shown in FIG.
8 is an explanatory diagram of a method for preventing pinching with an output signal V from a filtering unit and a determination output J of a determination unit in the switchgear shown in FIG.
FIG. 9 is an enlarged view of a vehicle window frame for explaining a mounting structure of the pressure-sensitive sensor according to the present invention.
FIG. 10 is an enlarged view of a portion B in FIG. 9;
FIG. 11 is an explanatory diagram of an operation when an object is pinched on an inclined side of a window frame in the pressure-sensitive sensor mounting structure according to the embodiment of the present invention;
FIG. 12 is a supplementary explanatory diagram of deformation occurring in a piezoelectric element material when an object is pinched on an inclined side of a window frame in the pressure-sensitive sensor mounting structure according to one embodiment of the present invention.
13A and 13B are configuration diagrams of a door portion on the rear seat side of an automobile when a partition frame is provided in addition to a window frame, and FIG. 13B is a configuration diagram when a partition frame is not provided. .
FIG. 14 is an explanatory diagram of another portion of the automobile to which the mounting structure and the opening / closing device of the pressure-sensitive sensor of the present invention are applied.
15A and 15B are explanatory diagrams of a pressure-sensitive sensor used in a conventional pinch detection device, wherein FIG. 15A is a side view, and FIG. 15B is a cross-sectional view taken along line AA of FIG.
16A and 16B are explanatory views of a state where a pressure-sensitive sensor used in a conventional pinch detection device is bent, where FIG. 16A is a side view, and FIG. 16B is a cross-sectional view taken along line BB of FIG. .
[Explanation of symbols]
11 door
13 Window frame (opening)
15 Window glass (opening / closing member)
17 Pressure sensor
19 Judgment means
21 Opening / closing drive means
23 Opening / closing control means
25 motor
27 wires
29 support
31 Guide
33 Piezoelectric element material
42 hollow
45 center electrode
47 Outer electrode
49 Composite piezoelectric layer
51 Coating layer
55 Resistor for disconnection detection
61 Voltage divider resistor
62 Filtering part
63 Judgment unit
65 signal input section
66 signal output section
67 Bypass section
72 Open / close contact detection section
73 control unit
100 Entrapment detection device
150 Switchgear

Claims (7)

An opening having an inclined side and another side connected thereto via a corner portion, and an opening / closing member for opening / closing the opening are disposed in at least one of the opening and closing members, and are provided between the opening and the opening / closing member. Mounting structure of a pressure-sensitive sensor that detects the entrapment of an object,
The pressure-sensitive sensor is formed in a flexible and elongated shape, and is provided so as to be inserted into elastic support means supporting the opening or the opening / closing member. A pressure-sensitive sensor mounting structure, which is provided on an inclined side. An opening having an inclined side and another side connected thereto via a corner portion, and an opening / closing member for opening / closing the opening are disposed in at least one of the opening and closing members, and are provided between the opening and the opening / closing member. Mounting structure of a pressure-sensitive sensor that detects the entrapment of an object,
The pressure-sensitive sensor has flexibility and is formed in an elongated shaft shape, and is provided so as to be inserted into elastic supporting means supporting the opening or the opening / closing member,
A mounting structure for a pressure-sensitive sensor, wherein a single continuous pressure-sensitive sensor is inserted through the elastic support means in a region including the inclined side and the other side. The mounting structure for a pressure-sensitive sensor according to claim 1, wherein the pressure-sensitive sensor outputs an electric signal in accordance with a deformation acceleration at the time of elastic deformation. The pressure-sensitive element according to any one of claims 1 to 3, wherein the piezoelectric element material of the pressure-sensitive sensor is formed of a composite piezoelectric material obtained by mixing chlorinated polyethylene and piezoelectric ceramic powder. Sensor mounting structure. The mounting structure for a pressure-sensitive sensor according to any one of claims 1 to 4, wherein a surface of the elastic support means is subjected to a high friction treatment. The mounting of the pressure-sensitive sensor according to any one of claims 1 to 4, wherein the whole or a part of the surface of the elastic supporting means is a surface exposing a material surface having no coating layer. Construction. A pressure-sensitive sensor mounted by the pressure-sensitive sensor mounting structure according to any one of claims 1 to 6,
Determining means for determining whether or not an object has contacted the pressure-sensitive sensor based on an output signal of the pressure-sensitive sensor;
Opening and closing drive means for operating the opening and closing member to open and close the opening,
When the determination means determines that there is contact with an object based on the electric signal from the pressure sensor, the operation of the opening / closing member is stopped or the opening / closing drive means is controlled so that the opening / closing member starts the opening operation. An opening / closing device comprising control means.

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