JPH1018699A - Insertion detector and power window device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve safety and reliability by augmenting a first decision value with an increase in the driving-current signal value of a motor for opening and closing a window while setting a second decision value at a small value with the reduction of the signal value of a pressure-sensitive sensor installed to a window frame. SOLUTION: When a window glass W is closed in response to an up-switch signal input through an input circuit 16, the insertion of a foreign matter between the window W and a window frame is decided when the voltage value of a signal Vs from a pressure-sensitive sensor S reaches a sensor-signal decision value or less or the driving- current signal V1 of a motor M reaches a driving-current signal decision value or more, and the closing operation of the window W is stopped and the window W is opened. The sensor-signal decision value is set at a value being proportioned to the voltage value of the driving-current signal V1 of the motor M at a plus gradient in response to the voltage value of the driving-current signal V1 . The driving-current signal decision value is set at a value being proportioned to the voltage value of the pressure-sensitive sensor signal Vs at the plus gradient in response to the voltage value of the pressure-sensitive sensor signal Vs. Accordingly, insertion can be detected quickly, and erroneous detection can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power window device having an anti-jamming function, and is used in the power window device to detect that a foreign object such as a human body is caught between a window glass and a window frame. The present invention relates to a pinch detection device.

[0002]

2. Description of the Related Art In recent years, a power window device of a vehicle has been provided with a means for detecting whether or not a foreign object such as a human body is caught between a window glass (window glass) and a window frame, and the window glass is closed. If a foreign object is detected while controlling to the upside (up side: up), the control to stop the closing side of the window glass is immediately stopped and the control is switched to the open side (downside: down) control. Have been put to practical use.

[0003] As a method for performing the above-described pinch detection, a direct method and an indirect method are considered. That is, in the direct method, a pressure-sensitive sensor whose output value (for example, resistance value or voltage value) changes according to the pressure applied from the outside is attached to the upper edge of the window frame, and the output value of this pressure-sensitive sensor is set in advance. This is a method of determining that pinching has occurred when the determined determination value is reached, that is, when the load applied to the window frame is greater than a predetermined value.

On the other hand, the indirect method detects a drive current or a rotation speed of a motor (a so-called power window motor) that opens and closes a window glass, and when the detected value reaches a predetermined judgment value, When the load applied to the glass increases and the driving current of the motor becomes larger than a predetermined value or when the rotation speed of the motor becomes smaller than a predetermined value, it is determined that the entrapment has occurred.

[0005] In this type of power window device having an anti-jamming function, it is desired that the occurrence of the jagging be detected as soon as possible when the load between the window glass and the window frame is small. For this purpose, it is necessary to set a judgment value for judging whether or not the entrapment has occurred to a side as sensitive as possible.

However, when the above-described indirect method is adopted, the sliding resistance of the window glass increases due to the reason that the waterproof rubber (so-called weather strip) provided on the window frame becomes hard in cold regions. However, since the drive current and rotation speed of the motor fluctuate, setting the judgment value for entrapment determination to the sensitive side as described above will result in erroneous detection that entrapment has occurred even though a human body or the like has not been entrapped. As a result, the window glass cannot be closed.

[0007] Even when the above-mentioned direct method is adopted,
Since the output value of the pressure-sensitive sensor may change due to vibration during vehicle running or the influence of electromagnetic waves (EMI), similarly to the case of the indirect method, if the determination value for the entrapment determination is set to the sensitive side, The window glass cannot be closed due to erroneous detection.

Therefore, in order to prevent such erroneous detection, for example, Japanese Patent Laid-Open No. 7-4137 employs both the direct method and the indirect method, and the occurrence of pinching is detected simultaneously by both methods. Only in such a case, it has been proposed to configure such that it is determined that pinching has actually occurred.

[0009]

However, according to the technique disclosed in the above-mentioned publication, if one of the direct method and the indirect method does not work due to, for example, a sensor failure, the pinching is prevented. (Forcibly stopping the control on the closing side of the window glass) cannot be performed.

Further, according to the technique disclosed in the above-mentioned publication, a visor for avoiding rain is provided on a window frame (a so-called side window visor).
When the visor is mounted, the tip (lower end) of this type of visor extends beyond the window frame toward the tip (upper end) of the window glass. May sandwich the human body or the like. In this case, the direct detection of the entrapment by the pressure-sensitive sensor is not performed, which is the same as the case where the pressure-sensitive sensor has failed.As a result, the operation for preventing the entrapment can be performed. Will be gone.

On the other hand, it is conceivable to adopt a configuration in which when the occurrence of entrapment is detected by one of the direct system and the indirect system, it is determined that entrapment has occurred. However, even with such a configuration, a disadvantage common to the above-described respective methods, that is, an erroneous detection is made when a judgment value for entrapment determination is set to a sensitive side in order to quickly detect occurrence of entrapment, Cannot be solved, and the occurrence of entrapment cannot be detected quickly and accurately.

The present invention has been made in view of such a problem, and can quickly detect that a human body or the like is sandwiched between a window glass and a window frame of a vehicle, and prevent erroneous detection in a normal state. It is an object of the present invention to provide an entrapment detection device capable of performing such operations and a power window device having high safety and reliability using the entrapment detection device.

[0013]

Means for Solving the Problems and Effects of the Invention In the pinch detecting device according to the first aspect of the present invention, the first detecting means is adapted to respond to a load applied to the window frame. An electric signal is output, and the first determination means determines whether or not the value of the electric signal output from the first detection means has reached a first determination value.

Further, the second detecting means outputs an electric signal according to the load applied to the window glass, and the second judging means outputs
It is determined whether or not the value of the electric signal output from the second detection means has reached a second determination value. And the detecting means,
When an affirmative determination is made by one of the first determination unit and the second determination unit (that is, the value of the electric signal output from the first detection unit by the first determination unit is equal to the first determination unit).
Or the second determination means determines that the value of the electric signal output from the second detection means has reached the second determination value). It detects that a foreign object has been caught between the window glass and the window frame.

Here, in particular, in the pinch detection device according to the first aspect, the first setting means sets the first determination value to:
According to the value of the electric signal output from the second detection means,
The first determination means is set so as to be more likely to make a positive determination when a load is applied to the window frame as the value of the electric signal indicates that the load applied to the window glass is greater.

Further, the second setting means sets the second determination value in accordance with the value of the electric signal output from the first detecting means, and the load applied to the window frame by the value of the electric signal is large. In such a case, the setting is made so that the second determination means makes a positive determination more easily when a load is applied to the window glass.

That is, in the pinch detection device according to the first aspect, the value of the electric signal output from the first detection unit according to the load applied to the window frame is set by the first setting unit. When the first determination value is reached, the value of the electrical signal from the second detection means, which is determined by the first determination means or output in accordance with the load applied to the window glass, is equal to the second determination value. When the second determination value set by the setting means is reached,
When it is determined by the second determination means, it is configured to detect that a foreign object has been caught between the window glass and the window frame. In particular, the first determination value is determined to be large when the load on the window glass is large. The first determination means is set to be more likely to make an affirmative determination, and the second determination value is set such that the greater the load on the window frame, the more easily the second determination means makes a positive determination. I am trying to set it.

According to the pinch detection device of the first aspect, the following operations and effects are obtained. First, in a normal state in which a foreign object is not sandwiched between the window glass and the window frame, for example, when a load is applied to the window frame due to mischief, or an electric signal output by the first detection unit is: Since the load on the window glass does not increase when it fluctuates due to noise or vibration during vehicle running, the first determination value is set to a value that is difficult for the first determination unit to make an affirmative determination by the first setting unit. Is set.
Therefore, even if only the load applied to the window frame is increased or only the electric signal output by the first detection means fluctuates due to noise or the like, it is not erroneously detected that the entrapment has occurred.

Similarly, in a normal state in which no foreign matter is caught between the window glass and the window frame, the sliding resistance of the window glass increases due to, for example, freezing in a cold region or aging of the window frame, When the load applied to the windowpane increases, or when the electric signal output by the second detection means fluctuates due to noise or the like, the load on the window frame does not increase. Is set to a value that is difficult for the second determination means to make an affirmative determination by the second setting means. Therefore, even if only the load applied to the window glass increases or only the electric signal output by the second detection means fluctuates due to noise or the like, it is not erroneously detected that the entrapment has occurred.

On the other hand, when a foreign substance is caught between the window glass and the window frame, both the load applied to the window frame and the load applied to the window glass increase. And the first
Is set by the first setting means to a value that can be easily judged by the first judgment means to be affirmative, and the second judgment value is judged by the second setting means to be an affirmative judgment by the second judgment means. It is set to a value that is easy to do.

Therefore, when a foreign object is really caught between the window glass and the window frame, the first determination means makes an affirmative determination at a time when the load applied to the window frame is small, and the load applied to the window glass is reduced. At a small time, the second determination means makes an affirmative determination. As a result, at a time when the load between the window frame and the window glass is extremely small, the detection means causes the foreign object to be caught between the window glass and the window frame. Will be detected.

Therefore, according to the pinch detecting device according to the first aspect, it is possible to quickly detect that a human body or the like is pinched between the window glass and the window frame, and to perform erroneous detection in a normal state. Can be achieved at an extremely high level. Further, according to the entrapment detection device of the first aspect, even if one of the first detection unit and the second detection unit fails, the entrapment detection timing is delayed from the normal state. In addition, the occurrence of the pinching itself can be detected. In addition, when a visor for avoiding rain (side window visor) is mounted on the window frame and a human body or the like is sandwiched between the visor and the window glass, if the load applied to the window glass increases, The occurrence of entrapment can be detected.

Incidentally, the first detecting means and the second detecting means can be constituted as described in claim 2 or 3. That is, in the pinch detection device according to claim 2, the first detection means includes a pressure-sensitive sensor attached to the window frame and having a resistance value that changes according to a pressure applied from the outside. A voltage signal corresponding to the resistance value is output as an electric signal corresponding to the load applied to the window frame. The second detecting means is configured to output a voltage signal corresponding to a drive current of a motor for opening and closing the window glass as an electric signal corresponding to a load applied to the window glass.

On the other hand, in the pinch detection device according to the third aspect, the first detection means is configured in the same manner as the pinch detection device according to the second aspect, and the second detection means uses a window glass. An electric signal corresponding to the rotation speed of the motor that opens and closes is output as an electric signal corresponding to the load applied to the window glass.

[0025] Such claim 2 or claim 3
According to the entrapment detection device described in (1), the first and second detection means can be simply configured, and the effect of the entrapment detection device according to Claim 1 can be obtained with a simple configuration. Can be. On the other hand, a power window device according to a fourth aspect includes the pinch detection device according to any one of the first to third aspects, and when the windowpane is controlled to be closed, When it is detected that a foreign object is caught between the window glass and the window frame,
It is configured to stop at least the closed side of the window glass.

And, as described above, according to the pinching detection device according to any one of claims 1 to 3,
It is possible to quickly detect that a human body or the like has been caught between the window glass and the window frame, to prevent erroneous detection in a normal state, and to perform the first detection unit and the second detection unit. According to the power window device according to claim 4, which is provided with such a pinch detection device, it is possible to reliably detect the occurrence of the pinch even if any one of the devices fails. Safety at the time of control to the closing side and reliability of the entire apparatus can be extremely enhanced.

[0027]

Embodiments of the present invention will be described below with reference to the drawings. It is needless to say that the embodiments of the present invention are not limited to the following examples, and can take various forms as long as they belong to the technical scope of the present invention.

FIG. 1 is a configuration diagram showing the configuration of a power window device according to an embodiment for controlling opening and closing (elevation) of a window glass of a vehicle. The power window device of the present embodiment includes a well-known window regulator 2 provided in a door D of a vehicle for opening and closing a window glass W, and a power window motor (hereinafter simply referred to as a motor) 4 for operating the window regulator 2. And a control device 6 for controlling the opening and closing of the window glass W by driving the motor 4 in the forward and reverse directions, and a pressure-sensitive sensor S attached to the upper edge of the window frame in which the window glass W is opened and closed.

Although only one motor 4 is shown in FIG. 1, it is actually provided at each door D of the vehicle. The control device 6 operates an up switch (that is, a window glass W) disposed in a well-known power window switch unit (not shown) operated by a vehicle occupant.
The motor 4 of each door D is driven forward / reversely in response to a switch signal from a switch for closing the window glass and a down switch (that is, a switch for opening the window glass W), whereby the window glass of each door is driven. W is opened and closed. Here, only the control for one door D will be described.

Here, the pressure-sensitive sensor S is formed by molding a pair of conductors formed in a belt shape and opposed to each other with a rubber material containing, for example, carbon or the like. Is configured to have a reduced resistance value. As shown in FIG. 2A, the pressure-sensitive sensor S is mounted along the indoor side of the sash 8 that forms the window frame of the vehicle and holds the waterproof weatherstrip 7. When a foreign object is interposed between W and the window frame (sash 8), the foreign object comes into contact with the pressure-sensitive sensor S.

FIG. 1 schematically shows the structure.
The ends of both conductors of the pressure-sensitive sensor S are connected to the control device 6. Then, inside the control device 6, one conductor of the pressure-sensitive sensor S is pulled up to a predetermined power supply voltage VDD by the resistor 10, and the other conductor is connected to the ground potential.

Therefore, of the two conductors of the pressure-sensitive sensor S, the voltage of the one pulled up by the resistor 10 is the power supply voltage VDD obtained by the resistance value of the resistor 10 and the resistance value between the two conductors.
, And as the pressure applied to the pressure-sensitive sensor S increases and the resistance value between the two conductors decreases (in other words, when a foreign object is caught between the window glass W and the window frame, , The greater the load applied to the window frame), the smaller the value. And by this, the resistor 1
The voltage of the conductor that has been pulled up by 0 is output as a pressure-sensitive sensor signal VS as an electric signal corresponding to the load applied to the window frame. In this embodiment,
The pressure sensor S and the resistor 10 correspond to a first detection unit.

On the other hand, the control device 6 includes a microcomputer (hereinafter, referred to as a CPU) 12 for executing various processes for controlling the window glass W, a signal (UP / SW signal) from the above-described up switch, and a down signal. An input circuit 16 for inputting a signal from a switch (DOWN SW signal), a signal from a limit switch 14 provided in the window regulator 2 (limit SW signal), and the like to the CPU 12 and a drive command from the CPU 12 Relays RLY1 and RLY2 as drive circuits for driving the motor 4 in the forward and reverse directions, and both relays RLY1 and RLY
2 is provided with a resistor 18 for detecting a driving current IM flowing to the motor 4.

That is, when the CPU 12 outputs a drive command for opening the window glass W, both relays RLY1 and RLY1 are output.
One terminal (upper terminal in FIG. 1) of the motor 4 is connected to the battery voltage VB of the vehicle by one relay RLY1 of RLY2, and the other relay RLY2 is connected to the other relay RLY2.
As a result, the other terminal (the lower terminal in FIG. 1) of the motor 4 is connected to the ground potential via the resistor 18, and as a result, the resistor 18 is connected to the motor 4 from the relay RLY1 to the RLY2. The drive current IM flows through the motor 4 and the motor 4 rotates in a direction to open the window glass W.

Conversely, when the CPU 12 outputs a drive command for closing the window glass W, the relay RLY2
1 connects the lower terminal of the motor 4 in FIG. 1 to the battery voltage VB of the vehicle, and connects the upper terminal of the motor 4 in FIG. 1 to the ground potential via the resistor 18 by the relay RLY1. As a result, the drive current IM flows from the relay RLY2 side to the RLY1 side via the resistor 18 in the motor 4, and the motor 4 rotates in the direction to close the window glass W. When the window glass W is not opened and closed, both terminals of the motor 4 are connected to the ground potential via the resistor 18 by the relays RLY1 and RLY2, so that the battery voltage VB is not applied to the motor 4. ing.

Therefore, in the control device 6, the resistor 18
The voltage generated at the end opposite to the ground potential of the motor 4
And the drive current IM of the motor 4 increases as the load applied to the window glass W increases, so that the voltage generated at the resistor 18 is
Is output as a motor drive current signal VI as an electric signal corresponding to the load applied to the motor. In this embodiment, the resistor 18 corresponds to a second detecting unit.

Then, the control device 6 controls the pressure sensor S
And the pressure-sensitive sensor signal VS from the resistor 10 and the resistor 1
An A / D converter 20 for converting the motor drive current signal VI from the controller 8 into a digital signal and outputting the digital signal to the CPU 12 is also provided. Note that the limit switch 14 is provided with a window glass W
The window regulator 2 is attached to a predetermined position so that the gap is turned on when the gap between the upper end of the window regulator and the window frame is within a predetermined value (for example, 4 mm) where it is assumed that pinching can no longer occur.

In the power window device of this embodiment configured as described above, the CPU 12 in the control device 6 controls the opening and closing of the window glass W by executing the control processing shown in FIG. The execution of this control process is started when an ignition switch (not shown) of the vehicle is turned on.

As shown in FIG. 3, when the CPU 12 starts execution of the control processing, first, at step (hereinafter simply referred to as "S").
At 110, an initialization process for initializing various internal data is executed. Then, in the following S120,
It is determined whether or not the down switch (DOWN / SW) is turned on. If the down switch is not turned on, in subsequent S130, the up switch (UP) is turned on.
SW) is turned on or not, and if the up switch is not turned on, the process proceeds to S140,
The motor 4 is stopped. Therefore, in this state, the lifting (opening / closing) of the window glass W is stopped.

On the other hand, if it is determined in step S120 that the down switch is turned on, the process proceeds to step S150, where the motor 4 is driven to lower the window glass W (open). Then, in S160, the voltage value of the motor drive current signal VI is detected via the A / D converter 20, and in S170, the motor 4 is detected based on the voltage value of the motor drive current signal VI detected in S160. It is determined whether or not the drive current IM has reached the lock current. The lock current corresponds to the drive current IM when the load applied to the window glass W increases and the rotation of the motor 4 stops.

If it is determined in S170 that the drive current IM has not reached the lock current, the above-described S1 is executed.
Returning to step S20, if it is determined in step S170 that the drive current IM has reached the lock current, it is determined that the window glass W has completely opened and stopped, and the process proceeds to step S180.
At 0, after the driving of the motor 4 is stopped, the process returns to S120.

On the other hand, if it is determined in S130 that the up switch has been turned on, the flow shifts to S190, where the motor 4 is driven to rotate in the opposite direction to that in S150, and Raise W (close).
Then, in S200, it is determined whether or not the above-described limit switch 14 is on. If the limit switch 14 is on, the gap between the upper end of the window glass W and the window frame is no longer pinched. Since it is within the predetermined value that is assumed to be impossible to occur, the process proceeds to S160. Then, as in the case of opening the window glass W, if the drive current IM of the motor 4 has not reached the lock current, the process returns to S120 (S160, S170: NO), and if the drive current IM has reached the lock current, the window It is determined that the glass W is completely closed, and the driving of the motor 4 is stopped (S170: YES,
S180).

Here, at S200, the limit switch 1
If it is determined that No. 4 is not turned on, there is a possibility that a foreign substance may be interposed between the window glass W and the window frame.
Proceeding to 210, the voltage value of the motor drive current signal VI is changed to A
The voltage value of the pressure-sensitive sensor signal VS is detected via the A / D converter 20 at S220.

Then, in S230, the voltage value of the pressure-sensitive sensor signal VS is compared with the voltage value of the pressure-sensitive sensor signal VS to determine whether or not a foreign object is caught between the window glass W and the window frame. A process as first setting means for setting the sensor signal determination value ThVS based on the following equation 1 according to the voltage value of the motor drive current signal VI detected in S210 is executed.

[0045]

## EQU1 ## ThVS = a1.times.VI + b1 = f1 (VI) (1) Then, in the following S240, the motor drive current is determined in order to determine whether or not a foreign object is caught between the window glass W and the window frame. A drive current signal determination value ThVI as a second determination value to be compared with the voltage value of the signal VI is set based on the following Expression 2 according to the voltage value of the pressure-sensitive sensor signal VS detected in S220. The processing as the setting means 2 is executed.

[0046]

ThVI = a2 × VS + b2 = f2 (VS) (2) In Equation 1, a1 and b1 are constants, and at least the constant a1 is set to a positive value. Further, the values of the two constants a1 and b1 indicate that no special load is applied to the window glass W and no pressure is applied to the pressure-sensitive sensor S (in other words, the load is applied to the window frame. 4), the sensor signal determination value ThVS is set to be sufficiently smaller than the voltage value of the pressure-sensitive sensor signal VS, as shown in the state before time t1 in FIG. .

Similarly, in Equation 2, a2 and b2 are constants, and at least the constant a2 is set to a positive value. Further, the values of the two constants a2 and b2 are such that the drive current signal determination value ThVI is smaller than the voltage value of the motor drive current signal VI as shown in the state before the time t1 in FIG. It is set to be large enough.

Then, in steps S230 and S240,
After executing the processing of step S250, the voltage value of the pressure-sensitive sensor signal VS detected in step S220 is equal to or less than the sensor signal determination value ThVS set in step S230 (VS ≤ ThVS).
A process as a first determination unit for determining whether or not the above is performed. If a negative determination is made in S250 (that is, if the voltage value of the pressure-sensitive sensor signal VS is larger than the sensor signal determination value ThVS), the process proceeds to S260.

In S260, the second judging means judges whether or not the voltage value of the motor driving current signal VI detected in S210 is equal to or more than the driving current signal judgment value ThVI set in S240 (VI ≧ ThVI). Is executed. If a negative determination is made in S260 (that is, if the voltage value of the motor drive current signal VI is smaller than the drive current signal determination value ThVI), the process returns to S120.

On the other hand, when the determination is affirmative in S250 (that is, when the voltage value of the pressure-sensitive sensor signal VS is equal to or less than the sensor signal determination value ThVS), or when the determination is affirmative in S260 (that is, when the motor drive current If the voltage value of the signal VI is equal to or greater than the drive current signal determination value ThVI, the process proceeds to S270. And in this S270,
When it is determined that a foreign object such as a human body has been caught between the window glass W and the window frame, the motor 4 is rotated in reverse to lower the window glass W for a predetermined time, and a process as a detection unit is executed. Then, the process returns to S120.

That is, in this control process, the input circuit 16
Window glass W in response to a switch signal input through
Is opened (down: down) or closed (up: up) (S120-S200), and the window glass W
Is closed, the voltage value of the pressure-sensitive sensor signal VS becomes equal to or less than the sensor signal determination value ThVS (S25).
0: YES) or when the voltage value of the motor drive current signal VI becomes equal to or greater than the drive current signal determination value ThVI (S26).
0: YES), it is determined that a foreign object such as a human body has been caught between the window glass W and the window frame, and the closing operation of the window glass W is immediately stopped and opened (S270).

In particular, in the control processing of this embodiment, S
The sensor signal determination value ThVS used for the determination of 250 is set as a value proportional to the voltage value of the motor drive current signal VI with a positive slope a1 in accordance with the voltage value of the motor drive current signal VI (S2).
30: The drive current signal determination value ThVI used for the determination in Equation 1) and S260 is set as a value proportional to the voltage value of the pressure-sensitive sensor signal VS with a positive slope a2 according to the voltage value of the pressure-sensitive sensor signal VS. (S240: Equation 2).

Next, the operation of the power window device of this embodiment will be described with reference to FIG. still,
FIG. 4 shows changes in the pressure-sensitive sensor signal VS, the sensor signal determination value ThVS, the motor drive current signal VI, and the drive current signal determination value ThVI when the window glass W is controlled to be closed.

First, as shown before time t1 in FIG. 4, in a normal state where no special load is applied to the window glass W and no pressure is applied to the pressure sensor S,
While the motor drive current signal VI is stabilized at a small value,
The voltage value of the pressure-sensitive sensor signal VS is stabilized at a large value. Then, the sensor signal determination value ThVS is set to a value sufficiently smaller than the voltage value of the pressure-sensitive sensor signal VS according to the voltage value of the motor drive current signal VI according to the above-described equation (1). The determination value ThVI is set to a value sufficiently larger than the voltage value of the motor drive current signal VI in accordance with the voltage value of the pressure-sensitive sensor signal VS according to the above equation (2).

Therefore, at normal time before time t1,
For example, even if the pressure-sensitive sensor signal VS fluctuates as shown by a dotted line in FIG.
Since the following is suppressed, and it is difficult to make an affirmative determination in S250 in the control process (FIG. 3), erroneous detection that the entrapment has occurred is prevented.

Similarly, in such a normal state,
For example, the load applied to the window glass W increases due to freezing in a cold region or the temporal change of the window frame, and the motor drive current signal V
Even if the voltage value of I becomes large or the motor drive current signal VI itself fluctuates due to noise or the like, the voltage value of the motor drive current signal VI becomes the drive current signal determination value ThVI.
This is suppressed, and S26 in the control process is suppressed.
Since it is difficult to make an affirmative determination with 0, erroneous detection that entrapment has occurred is prevented.

That is, in the normal state, even if one of the pressure-sensitive sensor signal VS and the motor drive current signal VI fluctuates due to a cause other than the entrapment, it is erroneously detected that the entrapment has occurred. Is sufficiently prevented. On the other hand, when a foreign object is caught between the window glass W and the window frame at time t1 in FIG. 4, the pressure applied to the pressure-sensitive sensor S (that is, the load applied to the window frame) and the window glass W Both the applied load increases.

Then, as shown after time t1 in FIG. 4, the voltage value of the pressure-sensitive sensor signal VS decreases (falls) and the voltage value of the motor drive current signal VI increases (rises). Do). Then, as the motor drive current signal VI rises, the sensor signal determination value ThV
S rises, approaching the voltage value of the pressure-sensitive sensor signal VS, and as the pressure-sensitive sensor signal VS falls, the drive current signal determination value ThVI falls, and the voltage value of the motor drive current signal VI Approaching.

Thereafter, as shown at time ta in FIG. 4A, the voltage value of the pressure-sensitive sensor signal VS is changed to the sensor signal determination value T.
hVS, and an affirmative determination is made in S250 of the control process, or as shown at time tb in FIG. 4B, the voltage value of the motor drive current signal VI is changed to the drive current signal determination value Th.
VI, and a positive determination is made in S260 of the control process, it is detected that the entrapment has occurred, and the window glass W
The control is switched from the close control to the open control.
Note that the timing at which the control of the window glass W is shifted to the opening side is the earlier timing between the time ta and the time tb.

As described above, when a foreign matter is truly caught between the window glass W and the window frame, the control process proceeds to S
At 250 and S260, it is easy to make a positive determination, and as a result, it is possible to detect that the entrapment has occurred when the load between the window frame and the window glass W is extremely small.

That is, the sensor signal determination value ThVS is calculated as shown in FIG.
As shown by the dashed line (A), in the case of a constant value that does not change from the initial value, the timing at which the affirmative determination is made in S250 of the control processing is time ta ', which is later than time ta, and the drive current signal The judgment value ThVI is the same as that shown in FIG.
As shown by the dashed line in the case of a constant value that does not change from the initial value, the timing at which the affirmative determination is made in S260 of the control process is time tb ′, which is later than time tb.
The time until it is detected that the entrapment has occurred becomes long. On the other hand, in the power window device of the present embodiment, it is possible to detect the occurrence of entrapment at an early stage when the load between the window frame and the window glass W is extremely small.

As described in detail above, in the power window device of this embodiment, the sensor signal determination value ThVS used for the determination in S250 in the control processing is changed in accordance with the voltage value of the motor drive current signal VI. The larger the value is, the larger the value is set so that an affirmative determination is easily made in S250.
The drive current signal determination value ThVI used for the determination of 60 is set to a small value in accordance with the voltage value of the pressure-sensitive sensor signal VS so that the smaller the voltage value, the more easily the positive determination is made in S260. I have.

Thus, only when a foreign object such as a human body is really caught between the window glass W and the window frame,
An affirmative determination is easily made in S250 and S260 of the control processing (in other words, the sensitivity of the pinch detection is made sensitive).

Therefore, according to the power window device of the present embodiment, it is possible to quickly detect that a human body or the like is sandwiched between the window glass W and the window frame, and to perform erroneous detection in normal times. Prevention can be achieved at an extremely high level. Furthermore, according to the power window device of the present embodiment, even if any one of the pressure-sensitive sensor signal VS and the motor drive current signal VI cannot be detected due to some kind of failure, the control processing is performed. S2 in
The occurrence of the entrapment can be detected by the determination of any one of 50 and S260.

As shown in FIG. 2B, a side window visor (hereinafter simply referred to as a visor) 22 for preventing rain is mounted on the window frame, and the visor 22 and the window glass W are disposed between the visor 22 and the window glass W. When the foreign object 24 such as a human body is sandwiched, the entrapment detection based on the pressure sensor S cannot be performed.
If the load applied to the window glass W increases to some extent, it is possible to detect the occurrence of the entrapment by the determination in S260 in the control process.

Therefore, according to the power window device of this embodiment, when the window glass W is controlled to be closed, it is possible to quickly detect the occurrence of the entrapment and stop the control of the window glass W on the closed side. Even if one of the pinch detection based on the pressure-sensitive sensor S and the pinch detection based on the drive current IM of the motor 4 becomes impossible, the occurrence of the pinch can be reliably detected, so that extremely high safety can be achieved. Sex can be obtained. In addition, since it is possible to prevent erroneous detection that the entrapment has occurred in the normal state, the reliability of the device can be extremely increased.

In the above embodiment, when it can be determined in advance that the pressure sensor S has failed (for example, the voltage value of the pressure sensor signal VS is low even though the window glass W is lowered). 4A), the sensor signal determination value Th as indicated by the arrow and the two-dot chain line in FIG.
VS is forcibly set to a large value, and S25 of the control process is performed.
A value of 0 may make it easier to make a positive determination. Similarly, when it can be determined in advance that the motor drive current signal VI cannot be detected (for example, when the motor drive current signal VI is 0 V despite opening and closing control of the window glass W). As shown by an arrow and a two-dot chain line in FIG. 4B, the drive current signal determination value ThVI may be forcibly set to a small value so that an affirmative determination is easily made in S260 of the control process. .

Thus, even when a sensor or the like fails, it is possible to detect the occurrence of entrapment as early as possible. On the other hand, in the above embodiment, the load applied to the window glass W is controlled by the drive current I of the motor 4.
Although the detection is performed as M, the rotation speed of the motor 4 may be detected instead of the drive current IM.
In this case, since the rotation speed of the motor 4 decreases as the load applied to the window glass W increases, the determination value compared with the rotation speed decreases as the voltage value of the pressure-sensitive sensor signal VS decreases. What is necessary is just to set so that it may become a large value.

In the above embodiment, as the pressure applied to the pressure sensor S increases, the pressure sensor signal VS
The voltage value of the pressure-sensitive sensor signal VS is determined to be smaller than or equal to the sensor signal determination value ThVS in step S250 of the control process. Change and the sensor signal determination value ThV
S may be changed so as to be set to a smaller value as the voltage value of the motor drive current signal VI increases.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating a configuration of a power window device according to an embodiment.

FIG. 2 is an explanatory diagram illustrating an attached state of a side window visor.

FIG. 3 is a flowchart illustrating a control process executed by a CPU of FIG. 1;

FIG. 4 is an explanatory diagram illustrating an operation of the power window device according to the embodiment.

[Explanation of symbols]

2 Window regulator 4 Power window motor (motor) 6 Control device S Pressure sensor W Window glass
D… Door 7… Weather strip 8… Sash 10,1
8 Resistor 12 Microcomputer (CPU) 14 Limit switch 16 Input circuit 20 A / D converter RLY1,
RLY2 relay 22 side window visor 24

Claims (4)

[Claims] 1. A power window device for controlling the opening and closing of a window glass of a vehicle according to external switch information, wherein a foreign object is interposed between the window glass and a window frame on which the window glass is opened and closed. A pinch detection device that detects an electric signal, and outputs an electric signal according to a load applied to the window frame.
Detecting means, and first determining means for determining whether or not the value of the electric signal output from the first detecting means has reached a first determination value; and A second detection unit that outputs an electric signal; a second determination unit that determines whether a value of the electric signal output from the second detection unit has reached a second determination value; The determination value of 1 is determined by the value of the electric signal output from the second detection means, the more the value of the electric signal indicates that the load applied to the window glass is larger, the more the first value is determined.
First setting means for setting the judgment means to make it easy to make an affirmative judgment when a load is applied to the window frame; and an electric signal output from the first detection means for setting the second judgment value. According to the value of the above, as the value of the electric signal indicates that the load applied to the window frame is larger, the second determination means is more likely to make a positive determination when the load is applied to the window glass. When a positive determination is made by the second setting unit to be set, or any one of the first determination unit and the second determination unit, a foreign object is interposed between the window glass and the window frame. And a detecting means for detecting that the pinch has occurred. 2. The pinch detection device according to claim 1, wherein the first detection unit includes a pressure-sensitive sensor attached to the window frame and having a resistance value that changes in accordance with a pressure applied from the outside. A voltage signal according to a resistance value of the pressure-sensitive sensor is configured to be output as an electric signal according to a load applied to the window frame, and the second detection unit includes a motor that opens and closes the window glass. A pinch detection device configured to output a voltage signal according to a drive current as an electric signal according to a load applied to the window glass. 3. The pinch detection device according to claim 1, wherein the first detection unit includes a pressure-sensitive sensor attached to the window frame, the resistance value of the first detection unit changing according to an externally applied pressure. A voltage signal according to a resistance value of the pressure-sensitive sensor is configured to be output as an electric signal according to a load applied to the window frame, and the second detection unit includes a motor that opens and closes the window glass. An electric signal according to a rotation speed is output as an electric signal according to a load applied to the window glass, The pinch detection device. 4. A power window device for controlling the opening and closing of a window glass of a vehicle according to external switch information, comprising: the pinch detection device according to claim 1; While controlling the glass to the closing side, if the detection unit detects that a foreign object is caught between the window glass and the window frame, at least the closing side of the window glass is stopped. A power window device, characterized in that: