JP3755209B2 - Powered window opening and closing device for vehicles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a motorized window opening and closing apparatus for a vehicle can be prevented in advance entrapment of foreign object by using the vehicle window.
[0002]
[Prior art]
In recent years, the number of vehicles equipped with power windows (powered window opening and closing devices for vehicles ) has increased, and accidents have occurred in which foreign objects such as fingers are caught between the window glass and the window frame during the closing operation of the power window. is doing. As means for preventing this accident, for example, in Japanese open flat 7-4137 discloses a force sensing means for sensing the external force such as cord switch which is disposed in the window frame peripheral, it energizes the motor 3 for advancing and retreating driving the window glass A power window is constituted by means for detecting a current value (hereinafter abbreviated as a motor current) and a control device for controlling these means.
[0003]
When the external force detected 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 sandwiched between the window glass and the window frame, and the power window The closing operation is interrupted.
The general structure of the cord switch is, for example, as described in Japanese Patent Application Laid-Open No. 7-96740, in which a pair of opposing conductive members are interposed with rubber elastic members to form a gap between the two conductive members. In addition, both conductive members are fixed to the elastic member. The elastic member is elastically deformed with the action of an external force, and when the external force exceeds a predetermined value and both the conductive members come into contact with each other and become energized, a signal is generated.
[0004]
[Problems to be solved by the invention]
By the way, if a malfunction occurs in which the external force cannot be accurately detected due to, for example, an insulating oxide film or deposit generated on the surface of the conductive member, the cord switch can sufficiently prevent foreign matter from being caught. The problem of not being able to occur.
[0005]
In view of the above points, an object of the present invention is to provide a power window that can detect foreign object pinching even when the above-described malfunction occurs in external force sensing means such as a cord switch.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention uses the following technical means.
According to the first to third aspects of the present invention, the first electrode member (52) is connected to the AC power source (8), and the second electrode member (53) is the input side of the window control means (1, 6). It is characterized by being connected to.
[0007]
As a result, even if foreign matter is caught when there is an insulating deposit or the like, induced power is induced in the second sensor electrode (53), so that a predetermined voltage value is applied from the second sensor electrode (53). Since it is possible to output, it is possible to reliably detect foreign object pinching. As a result, the reliability of the vehicle- powered window opening / closing device with the pinching prevention mechanism can be improved.
[0008]
In the second aspect of the present invention, both the electrode members (52, 53) are electrically connected by a resistance (R _D ) at one end in the longitudinal direction of the external force sensing means (5), and the input voltage and the output voltage are Are provided with determination means (10 to 12). When it is determined that the input voltage and the output voltage are different, the advance / retreat amount of the window (2) is reduced.
[0009]
The invention according to claim 3 is characterized in that the AC power supply (8) supplies an AC voltage to the first electrode member (52) only when the window (2) is closed.
In addition, the code | symbol in the bracket | parenthesis of each said means shows a corresponding relationship with the specific means of embodiment description later mentioned.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention shown in the drawings will be described.
(Embodiment)
FIG. 1 shows a vehicle door having a power window with a pinching prevention mechanism. Reference numeral 1 denotes a drive motor that opens and closes a window opening 4 formed by a window frame 3 by moving a window glass (window body) 2 forward and backward. . A pressure-sensitive switch (external force sensing means) 5 that senses an external force acting on the window frame 3 is disposed from the front side 3 a to the upper side 3 b of the window frame 3 at the peripheral edge on the indoor side of the window frame 3. ing.
[0011]
A control device 6 controls the drive motor 1 on the basis of a sandwiching signal 5a from the pressure-sensitive switch 5 and a power window switch 7 operated by the occupant. The window glass 2 is formed from the control device 6 and the drive motor 1. A window control means for controlling the advance and retreat of the window is configured.
Further, as shown in FIG. 2, the mechanical structure of the pressure-sensitive switch 5 includes first and second sensor electrodes (electrode members) 52 made of an elastically deformable conductive material in a tube 51 made of an insulating material such as rubber. , 53 are arranged to face each other with a predetermined gap (interval) 54 interposed therebetween. Incidentally, the conductive material forming both sensor electrodes 52 and 53 is a mixed material of a conductive material such as metal and an elastic material such as rubber.
[0012]
Reference numeral 55 denotes a copper drain wire (conductive wire) that suppresses a voltage drop when a current flows in the longitudinal direction of the sensor electrodes 52 and 53. As a result, the sensor electrodes 52 and 53 have substantially the same potential regardless of the longitudinal position of the pressure-sensitive switch 5, so that the current value (when the external force is sensed) is substantially equal regardless of the portion where the external force acts. Voltage value) can be detected.
[0013]
Incidentally, considering the bending moment acting on the pressure sensitive switch 5, the drain wire 55 is desirably disposed on the neutral plane m of bending.
Further, 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 a diode 9. Is connected to the input side of the control device 6. The AC power supply 8 is configured to supply the AC voltage to the first sensor electrode 52 only when the window glass 4 is instructed to close by the power window switch 7 ((d) in FIG. 5). reference).
[0014]
Incidentally, in the present embodiment, the frequency of the AC power source 8 supplies the AC voltage is about 50kH _Z ~100kH _Z, the maximum voltage is about 12V. The 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.
Incidentally, R _D is a longitudinal one end side at the both sensor electrodes 52, 53 is connected with a predetermined electric resistance value resistor of the pressure sensitive switch 5 (hereinafter, referred to as a diagnostic resistor.), R _C Is a resistor having one end connected between the second sensor electrode 53 and the diode 9 and the other end grounded.
[0015]
In the case where the voltage at point A on the first sensor electrode 52 side (hereinafter referred to as input voltage) is positive (+), 10 outputs a Hi level signal (1) and the input voltage is 0. In the following cases, the first buffer element outputs a Lo level signal (0), and 11 is a positive voltage (+) at point B on the second sensor electrode 53 side (hereinafter referred to as an output voltage). In this case, the second buffer element outputs the Hi level signal (1), and outputs the Lo level signal (0) when the output voltage is 0 or less.
[0016]
The output signals a and b from the buffer elements 10 and 11 are input to the exclusive OR element 12, and the exclusive OR element 12 receives both sensor electrodes based on the truth table of FIG. It is determined whether or not a break has occurred in 52 and 53.
Specifically, when the output signals a and b are equal, the input voltage and the output voltage can be regarded as equal. Therefore, the Lo level signal (0) is controlled by assuming that both the sensor electrodes 52 and 53 are not disconnected. 6 (y). Note that the electrostatic capacitance between the sensor electrodes 52 and 53 is extremely small when no external force is applied to the sensor electrodes 52 and 53, that is, when the distance between the sensor electrodes 52 and 53 is not changed. Therefore, the phase difference between the input voltage and the output voltage can be ignored.
[0017]
On the other hand, when the output signals a and b are different, it can be considered that the input voltage and the output voltage are different. Therefore, the Hi level signal (1) is output to the control device 6 assuming that the sensor electrodes 52 and 53 are disconnected ( y) Yes. Then, the control device 6 controls the drive motor 1 so that the amount of advancement / retraction of the window glass 2 is smaller (so-called inching) than when it is determined that both voltages are equal.
[0018]
As described above, the determination means for comparing and determining the input voltage and the output voltage is constituted by the buffer elements 10 and 11 and the exclusive OR element 12.
Next, the operation of this embodiment will be described.
1. When there is no insulating deposit on the opposing surfaces of both sensor electrodes 52 and 53 1-1 State in which no foreign matter is caught In this state, the maximum voltage at point B on the second sensor electrode 53 side (hereinafter, Is simply lower than the voltage at point A on the first sensor electrode 52 side (see FIG. 5A) by the voltage drop due to the resistance R _D (FIG. 5B). reference). 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.
[0019]
1-2 State in which foreign matter is caught When a foreign matter is caught between the window frame 3 and the window glass 2 and an external force is applied to the pressure sensitive switch 5 while the window glass 4 is closed, the tube 51 is caused by this external force. The sensor electrodes 52 and 53 come into contact with each other due to deformation.
For this reason, the voltage at the point B becomes substantially equal to the voltage at the point A (see FIG. 5A), and the control device 6 receives the sandwiching signal 5a having a voltage exceeding a predetermined voltage value. Entered. And the control apparatus 6 will output the inversion signal 6a toward the drive motor 1 so that the window glass 2 may be reversed in the opening direction, if the pinching signal 5a exceeding a predetermined voltage value is input.
2. When there are insulating deposits or the like on the opposing surfaces of the sensor electrodes 52 and 53 2-1 A state in which no foreign matter is caught This state is the same as the above-mentioned state 1-1 and is supplied from the AC power supply 8 The sandwiching signal 5a (a portion indicated by R in FIG. 5C) having a predetermined voltage value lower than the AC voltage thus input is input.
[0020]
2-2 State in which foreign matter is caught The tube 51 is deformed by an external force in the same manner as in the state 1-2 described above, but the two sensor electrodes 52 and 53 cannot be electrically contacted by an insulating deposit or the like.
However, since the insulating deposits and the like are considered to be very thin with a thickness of about 1 to 3 μm or less, the capacitance of the portion deformed by the external force becomes extremely large. For this reason, induced power is induced in the second sensor electrode 53 by the AC voltage supplied to the first sensor electrode 52 (the portion indicated by IR in FIG. 5C), and the voltage of the second sensor electrode 53 Exceeds a predetermined voltage value. Therefore, since the sandwiching signal 5 a exceeding the predetermined voltage value is input to the control device 6, the inverted signal 6 a is output toward the drive motor 1.
[0021]
Next, features of the present embodiment will be described.
As is clear from the above description of the operation, according to the pressure sensitive switch 5 according to the present embodiment, since the AC voltage is supplied to the first sensor electrode 52, foreign matter is caught when there is an insulating deposit or the like. Even if this occurs, since the induced power is induced in the second sensor electrode 53, the pinching signal 5a exceeding the predetermined voltage value can be output, so that the pinching of the foreign object can be reliably detected. . As a result, the reliability of the power window with a pinching prevention mechanism can be improved.
[0022]
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), so that the sensor electrodes 52 and 53 serve as antennas and the electromagnetic waves oscillate. .
On the other hand, in the present embodiment, since both sensor electrodes 52 and 53 are electrically connected to each other in the longitudinal direction of the pressure sensitive switch 5 by the diagnostic resistor R _D , the current flowing through both sensor electrodes 52 and 53 Of the first sensor electrode 52 and the second sensor electrode 53 are opposite to each other.
[0023]
Accordingly, 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 both the sensor electrodes 52 and 53 cancel each other. For this reason, it is possible to prevent noise disturbance occurring in other electrical equipment such as an engine control device and a radio.
By the way, in the above-mentioned embodiment, when the foreign object is caught between the window frame 3 and the window glass 2, the operation of the window glass 2 is reversed, but the advancement / retraction of the window glass 2 may be stopped. .
[0024]
Further, the gap 54 in the pressure sensitive switch 5 may be filled with a dielectric having a predetermined dielectric constant.
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.
[0025]
In the above-described embodiment, the pressure sensitive switch 5 is disposed on the window frame 3. However, by disposing the pressure sensitive switch 5 on the side visor that covers the periphery of the window opening 4, an external force acting on the window frame is detected indirectly. Yes.
[Brief description of the drawings]
FIG. 1 is a schematic view showing a vehicle door having a power window with a pinching prevention mechanism.
FIG. 2 is a cross-sectional view of a pressure sensitive switch.
FIG. 3 is an electric circuit diagram of a 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 ... 1st buffer element, 11 ... 2nd buffer element,
12: Exclusive ethical element.

Claims (3)

A window body (2) for opening and closing a window opening (4) formed by the window frame (3);
An external force sensing means (5) for sensing an external force acting on the window frame (3), having first and second electrode members (53) arranged to face each other at a predetermined interval;
An alternating current power source (8) for converting a direct current voltage from the vehicle battery into an alternating current and supplying the external force sensing means (5) with an alternating voltage;
Window body control means (1, 6) for moving the window body (2) forward and backward to open and close the window opening (4);
The first electrode member (52) is connected to the AC power source (8), and the second electrode member (53) is connected to the input side of the window control means (1, 6),
The window control means (1, 6) stops the advancement / retraction of the window (2) when the voltage input from the second electrode member (53) exceeds a predetermined voltage value. A vehicle- powered window opening and closing device. A resistance (RD) for electrically connecting the electrode members (52, 53) on one end side in the longitudinal direction of the external force sensing means (5);
Judgment means (10-12) for comparing and determining an input voltage supplied from the AC power supply (8) to the first electrode member (52) and an output voltage appearing at the second electrode member (53). ,
When it is determined by the determination means (10-12) that the input voltage and the output voltage are different, the window control means (1, 6) is compared with when the two voltages are determined to be equal. The window opening / closing apparatus for a vehicle with a power according to claim 1, wherein an amount of advancement / retraction of the window body (2) is reduced. The powered vehicle according to claim 1 or 2, wherein the AC power supply (8) supplies an AC voltage to the first electrode member (52) only when the window (2) is closed. Window opening and closing device.

Images