JPH10119565A - Power window opening and closing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect holding of foreign matters when insulating deposits exist by connecting a first electrode member with an AC power source and connecting a second electrode member with the input side of a window body control means. SOLUTION: When holding of foreign matters is generated when insulating deposits, etc., exist on the opposed surfaces of both of sensors electrodes 52 and 53, a tube 51 is deformed by external force and both the sensors 52 and 53 are not capable of electrically coming into contact with each other by insulating deposits. But, because the insulating deposits are considered to be about 1 to 3μm or below and very thin, capacitance of a portion deformed by external force becomes extremely large. Therefore, induced power is induced at the second sensor electrode 53 by AC voltage supplied to the first sensor electrode 52 and voltage of the second sensor electrode 53 exceeds a prescribed voltage value. Therefore, an inversion signal is outputted to a driving motor because a holding signal exceeding the prescribed voltage value is inputted in a controller.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power window opening and closing device which can be used in a vehicle window to prevent foreign objects from being trapped.

[0002]

2. Description of the Related Art In recent years, with the increase in vehicles equipped with a power window (powered window opening / closing device), a foreign object such as a finger is caught between a window glass and a window frame during a closing operation of the power window. Accidents are increasing. As means for preventing this accident, for example, in Japanese Patent Application No. 7-4137, power is supplied to an external force detecting means for detecting an external force such as a cord switch disposed on the periphery of a window frame and a motor 3 for driving the window glass forward and backward. Current value (hereinafter abbreviated as motor current)
And a control device for controlling these components constitute a power window.

[0003] When the external force sensed by the sensing means exceeds a predetermined value and the motor current exceeds a predetermined value, it is considered that a foreign object has been caught between the window glass and the window frame. The closing operation of the power window is interrupted. The general structure of the code switch is, for example, as described in JP-A-7-96740, in which a gap is formed between a pair of conductive members facing each other with a rubber elastic member interposed therebetween. In addition, both conductive members are fixed to the elastic member. The elastic member is elastically deformed by the action of an external force, and when the external force exceeds a predetermined value and the two conductive members come into contact with each other, a signal is generated.

[0004]

When the cord switch has a problem that the external force cannot be accurately detected due to, for example, an insulating oxide film or a deposit generated on the surface of the conductive member, There arises a problem that the foreign substance cannot be sufficiently caught.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide a power window capable of detecting a foreign object being caught even when the above-mentioned problem occurs in an external force sensing means such as a cord switch.

[0006]

The present invention uses the following technical means to achieve the above object. Claim 1
In the invention described in Item 3, the first electrode member (52) is connected to an AC power supply (8), and the second electrode member (53) is connected to an input side of the window body control means (1, 6). It is characterized by being.

Thus, even if foreign matter is trapped when there is an insulating deposit or the like, the second sensor electrode (53)
Since the induced power is induced in the second sensor electrode (53)
Since a predetermined voltage value can be output from the controller, it is possible to reliably detect the entrapment of foreign matter. As a result, it is possible to improve the reliability of the window opening / closing device with power provided with the anti-jamming mechanism.

According to the second aspect of the present invention, the two electrode members (52, 53) are provided at one longitudinal end of the external force sensing means (5).
Are electrically connected by a resistor (R _D ), and judgment means (10 to 12) for comparing and judging the input voltage and the output voltage is provided. Then, when it is determined that the input voltage and the output voltage are different, the amount of advance / retreat of the window body (2) is reduced.

According to a third aspect of the present invention, the AC power supply (8) supplies an AC voltage to the first electrode member (52) only when the window body (2) is closed. In addition, the code | symbol in the parenthesis of each said means shows the correspondence with the concrete means of embodiment mentioned later.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; (Embodiment) FIG. 1 shows a vehicle door having a power window with an anti-jamming mechanism, and 1 moves a window glass (window body) 2 forward and backward to open and close a window opening 4 formed by a window frame 3. Drive motor. A pressure-sensitive switch (external force sensing means) 5 that senses an external force acting on the window frame 3 is provided on the periphery of the window frame 3 on the indoor side from the front side 3a to the upper side 3b of the window frame 3. ing.

Reference numeral 6 denotes a control device for controlling the drive motor 1 based on a sandwiching signal 5a from the pressure-sensitive switch 5 and a power window switch 7 operated by an occupant.
The control device 6 and the drive motor 1 constitute window control means for controlling the advance and retreat of the window glass 2. Further, as shown in FIG. 2, the mechanical structure of the pressure-sensitive switch 5 is such that first and second sensor electrodes (electrode members) 5 made of an elastically deformable conductive material are placed in a tube 51 made of an insulating material such as rubber.
2 and 53 are opposed to each other with a predetermined gap (interval) 54 therebetween. Incidentally, the conductive material forming both sensor electrodes 52 and 53 is a mixed material of a conductive material such as a metal and an elastic material such as rubber.

Reference numeral 55 denotes a copper drain wire (conductor) that suppresses a voltage drop when a current flows in the longitudinal direction of the sensor electrodes 52 and 53. Thus, regardless of the longitudinal direction of the pressure-sensitive switch 5, each sensor electrode 5
Since the potentials 2 and 53 have substantially the same potential, substantially the same current value (voltage value) can be detected when the external force is sensed, regardless of the portion where the external force acts.

In consideration of the bending moment acting on the pressure-sensitive switch 5, it is desirable that the drain wire 55 be disposed on the neutral plane m of the bending. As shown in FIG. 3, the electrical structure of the pressure-sensitive switch 5 is such that the first sensor electrode 52 is connected to an AC power supply 8 that generates an AC voltage, while the second sensor electrode 53 is connected to a diode 9. Is connected to the input side of the control device 6 via the. The AC power supply 8 is configured to supply an AC voltage to the first sensor electrode 52 only when the power window switch 7 instructs the window glass 4 to close (FIG. 5D). reference).

[0014] Incidentally, in the present embodiment, the frequency of the AC power source 8 supplies an alternating voltage of about 50kH _Z ~100kH _Z
And the maximum voltage is about 12V. AC power supply 8
Is composed of a DC-AC converter such as a self-excited oscillation circuit that converts a DC current (DC voltage) from a vehicle battery (not shown) into an AC current. By the way, R _D is set at one end in the longitudinal direction of the pressure-sensitive switch 5 so that both sensor electrodes 52, 5
3 is a resistor (hereinafter referred to as a diagnostic resistor) having a predetermined electrical resistance value. R _C has one end connected between the second sensor electrode 53 and the diode 9 and the other end connected. This is a grounded resistor.

Reference numeral 10 denotes A on the first sensor electrode 52 side.
When the voltage at the point (hereinafter referred to as input voltage) is positive (+), a Hi level signal (1) is output and the input voltage becomes 0
In the following cases, the first output of the Lo level signal (0)
11 is a buffer element on the second sensor electrode 53 side.
When the voltage at the point (hereinafter referred to as the output voltage) is positive (+), a Hi level signal (1) is output, and the output voltage becomes 0.
In the following cases, the second output of the Lo level signal (0)
It is a buffer element.

The output signals a and b from the two buffer elements 10 and 11 are input to an exclusive OR element 12, and the exclusive OR element 12 is configured based on the truth table shown in FIG. It is determined whether a disconnection has occurred in both sensor electrodes 52 and 53. Specifically, when the output signals a and b are equal to each other, the input voltage and the output voltage can be regarded as equal, so that the Lo level signal (0) is determined assuming that the sensor electrodes 52 and 53 are not disconnected. 6 (y). When no external force acts on both sensor electrodes 52, 53, that is, when both sensor electrodes 52, 53
Since the capacitance between the two sensor electrodes 52 and 53 is extremely small when the distance between them does not change, the phase difference between the input voltage and the output voltage can be ignored.

On the other hand, when the output signals a and b are different,
Since the input voltage and output voltage can be regarded as different,
Assuming that both sensor electrodes 52 and 53 are disconnected, H
The i-level signal (1) is output (y) to the control device 6. Then, the control device 6 controls the drive motor 1 so that the amount of advance and retreat of the window glass 2 is reduced (so-called inching) as compared with when it is determined that the two voltages are equal.

As described above, both buffer elements 1
Judgment means for comparing and judging the input voltage and the output voltage is constituted by 0, 11 and the exclusive OR element 12. Next, the operation of the present embodiment will be described. 1. When there is no insulative deposit or the like on the opposing surfaces of both sensor electrodes 52 and 53 1-1 State where no foreign substance is caught In this state, the maximum voltage at point B on the second sensor electrode 53 side (hereinafter, referred to as Is simply referred to as a voltage), compared to the voltage at point A on the first sensor electrode 52 side (see FIG. 5A).
_It becomes lower by the voltage drop due to _D (see FIG. 5B). For this reason, the sandwiching signal 5 a having a predetermined voltage value lower than the AC voltage supplied from the AC power supply 8 is input to the control device 6.

1-2 A state in which foreign matter is caught When foreign matter is caught between the window frame 3 and the window glass 2 during the closing operation of the window glass 4 and an external force acts on the pressure-sensitive switch 5, this external force causes The tube 51 is deformed and the two sensor electrodes 52 and 53 come into contact. Therefore, the voltage at point B is
The voltage is substantially equal to the voltage at point A (see FIG. 5A), and the control device 6 receives the pinch signal 5a having a voltage exceeding a predetermined voltage value. Then, when the sandwiching signal 5a exceeding the predetermined voltage value is input, the control device 6 outputs the inversion signal 6a to the drive motor 1 so that the window glass 2 is inverted in the opening direction. 2. When there is an insulating deposit or the like on the opposing surfaces of both sensor electrodes 52 and 53. 2-1 State where foreign matter is not trapped. This state is the same as state 1-1 and is supplied from AC power supply 8. Signal 5a having a predetermined voltage value lower than the obtained AC voltage (portion indicated by R in FIG. 5C)
Is entered.

2-2 A state in which foreign matter is caught The tube 51 is deformed by an external force in the same manner as in the above-described state 1-2, but the two sensor electrodes 52 are
53 cannot make electrical contact. However, since the insulating deposits and the like are considered to be very thin having a thickness of about 1 to 3 μm or less, the capacitance of a portion deformed by an external force becomes extremely large. For this reason, an induced voltage is induced in the second sensor electrode 53 by the AC voltage supplied to the first sensor electrode 52 (portion indicated by IR in FIG. 5C), and the voltage of the second sensor electrode 53 is changed. Exceeds a predetermined voltage value. Therefore, the control device 6 receives the pinch signal 5a exceeding the predetermined voltage value, so that the inversion signal 6a is output to the drive motor 1.

Next, the features of this embodiment will be described. As is clear from the above description of operation, according to the pressure-sensitive switch 5 according to the present embodiment, since an AC voltage is supplied to the first sensor electrode 52, foreign matter is caught when there is an insulating deposit or the like. Occurs, the induced power is induced in the second sensor electrode 53, so that the pinch signal 5a exceeding the predetermined voltage value is generated.
Can be output, so that the pinching of foreign matter can be reliably detected. As a result, it is possible to improve the reliability of the power window with the anti-jamming mechanism.

By the way, when the window glass 2 is closed, an alternating current flows through the pressure-sensitive switch 5 (both sensor electrodes 52 and 53). Resulting in. On the other hand, in the present embodiment, since the two sensor electrodes 52 and 53 are electrically connected to one end of the pressure-sensitive switch 5 in the longitudinal direction by the diagnostic resistor _RD , the current flowing through the two sensor electrodes 52 and 53 is Of the first sensor electrode 52 and the second sensor electrode 53
Is the opposite.

Therefore, since the phase of the electromagnetic wave oscillated from the first sensor electrode 52 and the phase of the electromagnetic wave oscillated from the second sensor electrode 53 are shifted by about 180 °, the electromagnetic waves oscillated from the two sensor electrodes 52 and 53 cancel each other. Is done. For this reason, it is possible to prevent noise interference occurring in the engine control device and other electric equipment such as a radio. By the way, in the above-described embodiment, the operation of the window glass 2 is reversed when a foreign object is caught between the window frame 3 and the window glass 2, but the advance and retreat of the window glass 2 may be stopped. .

Further, a dielectric having a predetermined dielectric constant may be filled in the space 54 in the pressure-sensitive switch 5. Further, in the above-described embodiment, the function of diagnosing the disconnection of both sensor electrodes 52 and 53 is provided, but this diagnostic function may be deleted. The present invention can also be applied to a so-called sunroof (ceiling window) provided on the ceiling of a vehicle.

In the above-described embodiment, the pressure-sensitive switch 5 is provided on the window frame 3. However, by providing the pressure-sensitive switch 5 on the side visor covering the periphery of the window opening 4, an external force acting on the window frame is indirectly applied. May be detected.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a vehicle door having a power window with a pinch prevention mechanism.

FIG. 2 is a sectional view of a pressure-sensitive switch.

FIG. 3 is an electric circuit diagram of the pressure-sensitive switch.

FIG. 4 is a chart showing a truth table;

FIG. 5 is a chart showing an input voltage and an output voltage.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Drive motor, 2 ... Window glass (window body), 3 ... Window frame, 4
... window opening, 5 ... pressure-sensitive switch (external force sensing means), 6 ... control device, 7 ... power window switch, 8 ... AC power supply, 9 ... diode, 10 ... first buffer element, 11 ...
Second buffer element, 12 ... Exclusive ethical sum element.

Claims (3)

[Claims] 1. A window body (2) for opening and closing a window opening (4) formed by a window frame (3), and first and second electrode members (53) arranged to face each other at a predetermined interval. An external force sensing means (5) for sensing an external force acting on the window frame (3); an AC power supply (8) for supplying an AC voltage to the external force sensing means (5); and the window body (2). ) To move back and forth to open and close the window opening (4). The first electrode member (52) is connected to the AC power supply (8), and the second electrode The member (53) is connected to an input side of the window body control means (1, 6), and the window body control means (1, 6) is connected to the second electrode member (5).
A powered window opening / closing device, wherein when the voltage input from 3) exceeds a predetermined voltage value, the window body (2) stops moving forward and backward. 2. A resistor (R _D ) for electrically connecting the two electrode members (52, 53) at one longitudinal end of the external force sensing means (5); Determining means (10 to 12) for comparing and determining an input voltage supplied to the one electrode member (52) and an output voltage appearing at the second electrode member (53); When it is determined that the input voltage and the output voltage are different from each other, the window body control means (1, 6) controls the window body (2) as compared with when the two voltages are determined to be equal. The powered window opening and closing device according to claim 1, wherein the amount of advance and retreat is reduced. 3. The window body (2), wherein the AC power supply (8) is provided.
The powered window opening / closing device according to claim 1 or 2, wherein an AC voltage is supplied to the first electrode member (52) only at the time of the closing operation.