JP2854206B2 - Power window device with safety device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to a vehicle such as an automobile, and relates to a power window device for opening and closing a window by a motor or the like, and more particularly, to a power device with a safety device for performing a safety control operation against a pinching of a hand or head in a window. It relates to a window device.

[0002]

2. Description of the Related Art In general, a power window device opens and closes a window by a drive source such as a motor, so that a hand or a head may be pinched between a window glass and a sash. For this reason, there has been proposed a device provided with a safety device that detects such entrapment and stops the window closing operation, or performs a safety control operation for entrapment by opening the window. In such a power window device, as the detection of pinching, the rotation speed of the motor correlated with the opening and closing speed of the window is measured,
A method is used to detect when the speed is reduced below a certain reference value, that is, when the rotational speed is reduced due to an increase in the load applied to the window and the motor due to pinching.

However, in such a detection method, when the reference value of the pinch detection means is set strictly, when the window is almost fully closed and the window glass comes into contact with the weather strip provided on the sash, the weather is reduced. Since the rotational speed of the motor is reduced due to frictional resistance with the strip, it is easy to erroneously detect this as pinching, and as a result, the window closing operation is stopped and the window may not be fully closed. For example, in a window using a weather strip WS having a cross-sectional structure as shown in FIG. 8, the upper edge of the window glass 7 has a lip portion WL of the weather strip WS about 15 mm before the fully closed position of the window.
In a region where this contact state occurs (this is called a run channel region), resistance occurs in the window closing operation, the motor rotation speed is reduced, and erroneous detection tends to occur. In order to avoid this erroneous detection, the reference value of the entrapment is set loosely. However, this reduces the entrapment detection sensitivity in the run channel region,
It becomes impossible to detect pinching of a fingertip or the like. SS
Is a wind sash.

On the other hand, in a state where the window is almost completely closed, there is no danger of pinching. However, when safety control is operated at this time, the fully closed state of the window is detected as pinching, and the window is fully closed. It may not be closed. For this reason, the safety control operation is canceled in the region close to the fully closed state. At present, 4 mm before the fully closed state of the window is set as the release area. Conventionally, in order to set the release area of the safety control operation, the window opening / closing position is detected based on the motor rotation speed. However, the detection of the motor rotation speed involves, for example, the rotation of the motor. Since the generated pulse signal is used, there is a limit in increasing the detection accuracy due to the restriction of the pulse signal interval. Therefore, it is extremely difficult to detect the position of the front 4 mm in the fully closed state of the window as described above and the run channel region including the position with high accuracy. In particular, in an actual power window device, since the rotational force of the motor is transmitted to the window glass via a gear mechanism, a wire / pulley mechanism, etc., the rotational direction torsion caused by the damper provided in the gear mechanism is reduced. In addition, a shift occurs between the motor rotation speed and the window opening / closing position due to wire elongation, pulley wear, and the like, which makes it more difficult to detect the window opening / closing position with high accuracy.

[0005]

For this reason, a conventional power window device with a safety device detects a pinch in a run channel region with high sensitivity, while preventing malfunctions such as a safety control operation and a window fully closing operation. There is a problem that it is difficult to satisfy conflicting demands for prevention. An object of the present invention is to provide a power window device with a safety device capable of detecting a window opening / closing position with high accuracy, detecting pinching with high sensitivity, and preventing a malfunction of a safety control operation and a window fully closing operation. To provide.

[0006]

SUMMARY OF THE INVENTION According to the present invention, there is provided a means for detecting a pinch by comparing a rotation speed of a motor for opening and closing a window with a reference value, and a means for detecting an open / close position of the window near a fully closed state. And a means for setting a detection reference value for pinching based on the detected open / close position of the window. The means for detecting the open / close position of the window includes a position sensor for detecting the amount of movement of the window glass. . In the position sensor, the window glass or a member integrated with the window glass is moved to a position near the fully closed window.
A sensing unit to be moved which in contact with integrally with the window glass when it is moving, the signal output and reducing unit to reduce the amount of movement of the sensing portion, a reduced amount of movement as an electrical displacement A signal generating unit; and a casing for sealing at least the signal generating unit in a liquid-tight manner.

[0007]

Next, the present invention will be described with reference to the drawings. FIG. 1 is an overall configuration diagram of a power window device to which the present invention is applied, and a window opening / closing mechanism 1 is provided in a lower vehicle body of an automobile window. This window opening and closing mechanism 1
Has a rail 2 extending in the up-down direction, and the rail 3 holds a slider 3 slidably up and down. A wire 4 is connected to the slider 3, the wire 4 is wound around a pulley 5 disposed at the upper and lower ends of the rail 2, and further provided on a power window drive unit 6 fixed and supported at a substantially intermediate position of the rail. Wrapped around pulley. The power window driving unit 1 is provided with a motor 11 for driving a pulley as described later. When the motor 11 is driven, the wire 4 is rotated by a driving pulley 18 and the slider 3 is moved up and down. You. A window glass 7 is attached to the slider 3 to open and close a window space defined by a sash when the slider 3 is moved up and down together with the slider 3. Further, a position sensor 8, which will be described in detail later, is fixed to a position near the upper end of the rail 2, and is configured to detect a moving position of the slider 3, in other words, a window opening / closing position.

FIG. 2 shows a schematic configuration of a part of the power window driving section 6. In FIG. 1, reference numeral 11 denotes a motor as a drive source, and a circular magnet 12 which is SN-magnetized in a radial direction is attached to a part of a rotating shaft 1a thereof. Has a pair of Hall elements 13a and 13b arranged at a central angle of 90 degrees, and the magnet 12 and the Hall elements 13a and 13b constitute a motor rotation sensor 13. This motor rotation sensor 13
When the magnet 12 is rotated together with the motor rotation shaft 1a, the Hall elements 13a and 13b output pulse signals out of phase with each other.

A worm 14 is attached to the tip of the motor rotation shaft 1a, and meshes with a worm wheel 15. The worm wheel 15 is engaged with an output pulley shaft 17 via a damper 16 and the worm wheel 15
The driving force is rotated via the output pulley shaft 17 to drive the wire 4. The damper 16 has metal plates 16b and 16c attached to both sides of a disc-shaped rubber plate 16a.
6c is integrated with the worm wheel 15 by screws 19, and the other metal plate 16b is engaged with the output pulley shaft 17. The damper 16 uses the elastic deformation of the rubber plate 16a to reduce the shock generated between the two metal plates 16b and 16c, that is, between the motor side and the window glass side.
Reference numeral 20 denotes a housing of the power window drive unit 1.

FIG. 3 is a partially exploded perspective view of the position sensor 8. A potentiometer 22 is provided in a box-shaped case 21 having an open top. Although a detailed description of the potentiometer 22 is omitted, for example, by sliding a conductive piece back and forth in a linear direction on a plate-shaped resistor, a resistance value corresponding to the sliding position is output. It is configured to be. The conductive piece is integrally supported by an insulating moving body 23, and is urged in one direction by a spring 24 mounted on the moving body 23. A harness 25 is connected to the potentiometer 22 and is led out through a hole in the case 21.

A sensing lever 26 is supported by a pin 27 inserted in a hole 26a provided in a part of the case 21 in which the potentiometer 22 is provided. The sensing lever 26 can swing horizontally about a pin 27. The base end of this sensing lever 26 has an elongated hole 26b
Is formed, and a projection 23a provided on the moving body 23 of the potentiometer 22 is fitted into the elongated hole 26b. The distal end of the sensing lever 26 is formed longer than the proximal end and protrudes outside the case. The upper opening of the case is covered with a cover 28 to form a casing, and the surroundings are sealed to seal the potentiometer 22 in a liquid-tight manner. Further, a waterproof boot 29 for ensuring liquid tightness between the tip of the sensing lever 26 and the casing is covered.

As shown in an enlarged view of a part of the power window device in FIG. 4, the position sensor 8 fixes a part of the casing at a position near the upper end of the rail 2 with a screw or the like, and has a sensing lever. 26 to the slider 3
Facing the trajectory of Therefore, as shown by the two-dot chain line in FIG. 2, when the slider 3 moved on the rail 2 is moved to near the fully closed position of the window, the slider 3 is implanted on the protrusion 3a provided integrally with the slider 3. Contact pin 3b
Contacts the tip of the sensing lever 26 and pushes it to swing the sensing lever 26 in the direction of the arrow. The swinging of the sensing lever 26 is performed by a stroke reduced in accordance with the lever ratio between the distal end portion and the proximal end portion centered on the pin.
b to move the moving body 23 of the potentiometer 22. With the movement of the moving body 23, the conductive piece is integrally moved on the resistor, the resistance value is changed, and an output voltage changed based on the change in the resistance value is output as a position detection signal. .

FIG. 5 is a circuit diagram of a power window device including the position sensor. In the figure, a microcomputer 30 receives a pulse signal from the motor rotation sensor 13 for detecting rotation of a motor 11 as a drive source of a power window. Also, a position detection signal from the position sensor 8 is input. Further, the window opening / closing operation is selected by the function switch 31 which is manually operated, and the selection signal is input. The function switch 31 is operated when the window is opened or closed automatically or manually. Further, the motor drive circuit 32 is configured to control the rotation of the motor 11 based on a signal from the microcomputer 30.

The microcomputer 30 is provided with a system for detecting a safety control area based on a window opening / closing operation state and a system for detecting foreign matter trapping.
The system for detecting the safety control area includes a window opening / closing device that detects the periodicity of the pulse signal output from the motor rotation sensor 13 to detect the rotation direction of the motor, and detects the opening / closing direction of the window accompanying the detection. It has a direction detecting means 33. The window opening / closing position detecting means 34 is constituted by, for example, an up / down counter. After the count value in the fully closed state of the window is initialized to 0, the pulse signal when the motor rotates forward in the negative direction. By counting and counting the pulse signal when the motor rotates in the forward direction, the open / close position of the window is detected based on the count value. Further, the safety control area discriminating means 35 discriminates a safety control area excluding a safety control operation canceling area provided in a required range on the fully closed position side of the window, based on an output of the window opening / closing position detecting means 34. Only the safety control operation is performed.

On the other hand, the position detection signal from the position sensor 8 is input to means 36 for detecting the absolute position of the window, where a highly accurate window opening / closing position near the fully closed state of the window is detected. This detection output is input to the safety control area determination means 35 and a reference value setting means 42, which will be described later, and is used when determining the safety control area or for setting the reference value of the pinch detection reference. In the determination of the safety control area, the output of the safety control area determination means 35 is input to one input terminal of the AND gate 37, and another part is input to the operation command means 38. The operation command means 38 outputs an operation command corresponding to the state of the function switch 31 to the motor drive circuit 32.

On the other hand, the system for detecting the entrapment of foreign matter includes a motor rotational speed detecting means 39 for detecting the interval time of the signal from the motor rotational sensor 13 and detecting the rotational speed of the motor.
And a pinch detection unit 40 that detects a drop in the foreign object by comparing the detected speed with a reference value to detect a decrease in the speed. The output of the pinch detection means 40 is input to the other input terminal of the AND gate 37.
The output of the AND gate 37 is output to the safety control operation command means 4.
1, the safety control operation command means 41 controls the operation command means 38 to perform the safety control operation when the pinch detection signal is input. Here, control is performed to operate the window glass in a direction of opening 12 cm from the opening / closing position at that time.

A reference value setting means 42 for setting a reference value for detection of entrapment is connected to the entrapment detection means 40. The reference value setting means 42 receives a position detection signal from a window position detection means 36 for detecting a window position based on a signal from the position sensor 8, and detects a pinch detection means in accordance with the value of the position detection signal. The reference value set to 40 is changed.

According to the power window device having such a configuration, when the motor 11 starts rotating, a pulse signal is input from the motor rotation sensor 13 to the microcomputer 30. Then, the motor rotation speed detection means 39 detects the motor rotation speed based on the signal interval of the pulse signal, and when the motor rotation speed becomes lower than the reference speed, the pinch detection means 40 outputs a pinch signal of a foreign substance. In this case, at least one of the absolute speed and the relative speed is used as the rotation speed of the motor. The absolute speed is obtained by detecting the interval time of the pulse signal, for example, the interval time of the rise of the pulse signal, and calculating the rotation speed of the motor. Further, the relative speed is obtained by calculating a rate of change of the interval time of the pulse signal, for example, a rate of change of the interval time of the rise of the pulse signal.

On the other hand, the opening / closing direction detecting means 33 uses the pulse signal from the motor rotation sensor 13 to detect the rotating direction of the motor 11, that is, the opening / closing direction of the window. this is,
One rotation of the motor rotation shaft causes a pair of Hall elements 13a, 13
Since pulse signals shifted by 1/4 period from b are output, the rotation direction can be detected by using the phase difference between these pulse signals. The window opening / closing position detecting means 34 adjusts the value of a built-in counter based on the opening / closing direction and the motor rotation amount, and detects the current window opening / closing position from the value of this counter. Safety control area determining means 35
Determines whether the current window is in the safety control area based on the output of the window opening / closing position detecting means 34, and outputs a signal to the AND gate 37 when the window is in the safety control area.

Further, when the window is closed to a state in which the window is almost fully closed, a part of the slider 3 supporting the window comes into contact with the distal end of the sensing lever 26 of the position sensor 8, and is pushed by the slider to detect the sensing lever. 26 is swung in one direction. The window movement amount is reduced by the lever ratio of the sensing lever 26 and transmitted to the potentiometer 22 to operate it. At this time, if the lever ratio between the distal end portion and the proximal end portion of the sensing lever is designed to be about 5: 1, the movement amount of the window by 25 mm can be reduced to about 5 mm, so that the potentiometer 22 has a small full stroke of 5 mm. Can be used, but it is possible to sufficiently cover the moving range (usually about 15 mm) from when the window reaches the run channel area until the window is fully closed. Thereby, the potentiometer 22
Is changed, and the position sensor 8 outputs a voltage corresponding to the amount of movement of the slider. For example, if the connection is made such that the power supply voltage of the microcomputer 30 is divided by the position sensor, the divided voltage corresponding to the open / close position of the window can be output from the pojosin sensor 8.

The output of the position sensor 8 is input to a window position detecting means 36, where the open / close position of the window is detected. At this time, as shown in FIG. 7, the relationship between the output voltage of the position sensor 8 according to the window opening / closing position and the rotation speed (relative speed) of the motor 11 is such that the voltage output from the position sensor when the window is fully closed. the by setting as the reference voltage V _0, it can be detected by the voltage difference between the opening and closing position of the window, and the reference voltage V ₀ and the detected voltage V _x. Since the position sensor 8 continuously detects the window position and continuously outputs the voltage value, the voltage difference can be finely measured, and highly accurate detection is possible. Therefore, if the detected window position is input to the safety control area determination means 35, the determination of the safety control area in the vicinity of the fully closed window can be performed with high accuracy. In this embodiment, the dimension of about 4 mm immediately before the window is completely closed can be detected with high accuracy, and the release area of the safety control operation can be managed with high accuracy.

On the other hand, the output of the window position detecting means 36 is input to the reference value setting means 42. Here, the position where the window comes into contact with the weather strip is stored in advance from the shape of the weather strip, and a suitable reference value for pinch detection is set in accordance with the stored position. For example, in the weather strip having the cross-sectional shape shown in FIG. 8, it has been found that the run channel region where the window glass 7 contacts the weather strip WS is a region approximately 15 mm from the fully closed position. Therefore, in this run channel area, the reference value setting unit 42 performs setting to change the reference value.

That is, as shown in FIG. 7, in the safety control region except the run channel region, the reference value is set to be substantially constant, but in the run channel region, the reference value is set based on a change in the output voltage of the position sensor. The reference value is set to a value lower than this. Thus, even if the relative speed of the window closing operation is changed due to the resistance of the window glass due to the resistance of the window glass, the detection is not erroneously detected as a pinch.
In this embodiment, since the load actually applied to the motor is measured and a suitable reference value is set in response to the measured load, the safety control in the latter half of the run channel region, that is, the window is almost completely closed. In the area immediately before the end of the area, the reference value is set slightly higher. In addition, in order to actually gain a margin, the reference value is set immediately before entering the run channel area.

It is to be noted that the pinch detection signal is provided by the AND gate 3
7 and simultaneously input to the safety control operation commanding means 41 through the AND gate 37 according to the signal from the safety control area determining means 35. The safety control operation command means 41 operates the operation command means 38 based on the input signal, and executes the safety control operation. In this safety control operation, the operation command means 38 reverses the polarity of the current supplied to the motor 11 via the motor drive circuit 42, and the motor is rotated in the reverse direction to open the window glass by a predetermined amount (12 cm). Stop on top. Thereby, the entrapment is released, and safety is ensured.

Here, since the position sensor 8 directly detects the position of the opening and closing operation of the window, even if the damper 16 of the power window drive unit 6 is twisted in the rotational direction, the amount of movement of the window is reduced. No error occurs in the detection, and the open / close position of the window can be detected with high accuracy. Further, in this embodiment, the potentiometer 22 constituting the main part of the position sensor 8 is sealed in a liquid-tight casing, so that the moisture reaching the power window device through the window of the automobile reaches the power meter. The position sensor is not electrically short-circuited or corroded, and high reliability is obtained. Further, when the window is operated in the opening direction, the position sensor 8 is provided with a spring 24 inside the potentiometer 22.
With this force, the tip of the sensing lever 26 elastically contacts the slider 3 to maintain the state of contact between them, and reliably detects the movement of the slider and outputs a position detection signal.

[0026]

As described above, the present invention detects the open / close position of the window in the vicinity of the fully closed state of the window, and sets the reference value for the pinch detection based on the open / close position. While detection can be performed with high sensitivity, there is an effect that erroneous detection of entrapment and erroneous operation of the window fully closing operation can be prevented. In particular, the entire window
Since the open / close position near the close position is directly detected by the position sensor, the drive source and the window as in the case where the open / close position of the window is relatively detected based on a signal obtained from a drive source such as a motor. There is no detection error due to the relative displacement between the two, and the actual position of the window in the state of the fully closed state can be detected with high accuracy, and the detection of pinching with high accuracy becomes possible. Further, the position sensor may be a window glass or an integral part thereof.
This occurs when the member is moved to a position near the fully closed window.
It is sufficient to provide a sensing part that moves in contact with
By providing a reduction section in the sensing section of the
The window is fully closed while simplifying the configuration and miniaturizing
The open / close position at the side position can be detected in a wide range, the waterproof performance is high, and highly reliable detection is possible.

[Brief description of the drawings]

FIG. 1 is a side view showing the overall configuration of a power window device according to the present invention.

FIG. 2 is a partially exploded perspective view of a part of a power window drive unit.

FIG. 3 is a partially exploded perspective view of a position sensor.

FIG. 4 is an enlarged perspective view of a part of the power window device.

FIG. 5 is a block diagram showing an electrical configuration of the power window device.

FIG. 6 is a diagram illustrating a relationship between a motor rotation speed and an entrapment detection reference value.

FIG. 7 is a diagram illustrating a relationship between a motor rotation speed and an output of a position sensor in the vicinity of a fully closed window.

FIG. 8 is a sectional view showing an example of a weather strip.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Power window opening / closing mechanism 6 Power window drive part 7 Window glass 8 Position sensor 13 Motor line sensor 36 Window position detecting means 39 Motor rotational speed detecting means 40 Pinching detecting means 42 Reference value setting part

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-61485 (JP, A) JP-A-3-41086 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) E05F 15/10-15/16 B60J 1/00-1/17

Claims (1)

(57) [Claims] 1. A power window device for detecting a pinch of a window opened and closed by a motor and performing a safety control operation, comprising: means for comparing the rotation speed of the motor with a reference value to detect pinch; A means for detecting an open / close position in a state close to fully closed; and a means for setting a detection reference value for pinching based on the detected open / close position of the window, wherein the means for detecting the open / close position of the window includes a window glass. It consists of a position sensor for detecting the amount of movement, the position sensor, the Winn
Glass or a member integral with the glass, the window is fully closed
When it is moved to the side position, it touches this and windgal
And the amount of movement of the sensing unit
And the electrical displacement amount
A signal generator for outputting the signal as at least
A power window device with a safety device, comprising: a casing for sealing a portion in a liquid-tight manner .