JP2561886Y2 - 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 particularly includes a safety device for performing a safety control operation of pinching a hand or a head in the window. It relates to a power 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. To detect this entrapment, the rotational speed of the motor correlated with the opening / closing speed of the window is measured, and when this speed falls below a certain reference value, that is, the load applied to the window and the motor due to the entrapment increases. A method of detecting when the rotation speed has been lowered by using the method is used.

[0003]

In such a detection system, a speed reduction when the window is completely closed and the window collides with the sash is erroneously detected as a pinch, and the safety control operation is operated to open the window. Open operation,
The window may not close. In order to avoid this, the open / close position of the window is constantly detected by using the rotation amount of the motor, and the safety control is released near the fully closed state of the window and the safety control is released so that the window can be completely closed. An operation release area is provided. It is important that the release area be set to an extremely small area in order to prevent the child's finger or the like from being pinched. Specifically, the release area is about 4 mm before the window is fully closed.

However, 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, and the like, a damper provided in the gear mechanism operates to rotate in the rotation direction. When the twist is generated, the correlation between the rotation amount of the motor and the opening / closing position of the window is deviated, and the release area cannot be controlled to the above-described size with high accuracy. An object of the present invention is to provide a power window device including a safety device that can manage a release region of a safety control operation with high accuracy.

[0005]

SUMMARY OF THE INVENTION The present invention comprises means for detecting a rotation state of a motor for opening and closing a window, and means for detecting a moving amount of the window. Based on the detected movement amount of the window, the open / closed absolute position of the window is detected based on the detected amount of movement of the window, and the safety control operation is executed based on the detection results.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 2 is a schematic configuration diagram of a power window device to which the present invention is applied, and an opening / closing mechanism 10 is provided in a lower vehicle body of a vehicle window. The opening / closing mechanism 10 has a rail 2 extending vertically, and holds the slider 3 slidably up and down. A wire 4 is connected to the slider 3,
The wire 4 is wound around pulleys 5 provided at the upper and lower ends of the rail 2 and connected to the power window drive unit 1. When the motor provided in the drive unit 1 is driven, the wire 4
, The slider 3 is moved up and down. Also, slider 3
A window glass 6 is attached to and opens and closes a window space defined by a sash 7 when the window glass 6 is moved up and down together with the slider 3.

FIG. 1 shows the internal structure of the power window driving section 1. In the figure, reference numeral 11 denotes a motor as a driving source, and S
An N-magnetized circular magnet 12 is mounted, and a pair of Hall elements 13a and 13b are arranged at a central angle of 90 degrees outside the circumference of the magnet 12, and these magnets 12 and Hall elements 13a and 13b are arranged. 13b constitute a motor rotation sensor MRS. Also, the motor rotation shaft 1a
A worm 14 is attached to the other end of the worm wheel and meshed with a worm wheel 15. The worm wheel 15 is engaged with an output pulley shaft 17 via a damper 16, and the rotational force of the worm wheel 15 rotates the pulley 18 shown in FIG. 2 via the output pulley shaft 17 to drive the wire 4. It has become.

The damper 16 is a disc-shaped rubber plate 16a.
Metal plates 16b and 16c are adhered to both sides of the worm wheel 15, one metal plate 16c 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. Then, a ring magnet 20 that is SN-polarized in multiple directions in the circumferential direction is fixed to the surface of the metal plate 16b engaged with the output pulley shaft 17 on the window glass side,
A pair of Hall elements 21a and 21b are arranged around the ring macnet 20 at a dimensional interval of half the SN magnetization width. The ring magnet 20 and the Hall element 2
1a and 21b constitute a window movement sensor WTS for detecting the rotation amount of the output pulley shaft 17, in other words, the movement amount of the wire 4 connected thereto, that is, the movement amount of the window glass 6 integrated with the wire. Reference numeral 22 denotes a housing of the power window drive unit 1.

FIG. 3 is a circuit diagram of a power window device including the motor rotation sensor MRS and the window movement sensor WTS. In the figure, a microcomputer 1
00 is the motor 1 as a drive source of the power window.
A pulse signal from the motor rotation sensor MRS for detecting one rotation is input. The window opening / closing operation is selected by the function switch 101, and a selection signal is input. The function switch 101 is operated when the window is automatically or manually opened and closed. Further, the motor drive circuit 102 controls the rotation of the motor 11 based on a signal from the microcomputer 100.

The microcomputer 100 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. A system for detecting a safety control area includes a window opening / closing device that detects a periodicity of a pulse signal output from the motor rotation sensor MRS to detect a rotation direction of the motor, and detects a window opening / closing direction accompanying the detection. Direction detecting means 1
With 10. In addition, window opening / closing position detecting means 111
Is configured with an up-down counter, for example, after initially setting the count value when the window is fully closed to 0, counting the pulse signal when the motor rotates forward in the negative direction,
By counting the pulse signal when the motor rotates reversely in the forward direction, the window open / close position is detected based on the count value. Further, the safety control area determination means 112
Based on the output of the window opening / closing position detecting means 111, a safety control region other than a safety control operation cancellation region provided in a required range on the fully closed position side of the window is determined, and the safety control operation is performed only in this region. .

On the other hand, a signal from a window movement sensor WTS provided for the opening / closing mechanism 10 is inputted to a means 113 for detecting the absolute position of the window, where a highly accurate window absolute near the fully closed state of the window is detected. The position is detected. This detection output is output from the safety control area
And is used when the above-described determination of the safety control area is performed with high accuracy. The output of the safety control area determination means 112 is input to one input terminal of the AND gate 114, and another part is input to the operation command means 117. The operation command means 117 is provided with the function switch 10
An operation command corresponding to the state of the first switch is output to the motor drive circuit 102.

On the other hand, a system for detecting the entrapment of foreign matter includes a motor rotation speed detection means 115 for detecting the interval time of the signal from the motor rotation sensor MRS to detect the rotation speed of the motor, and a reference to the detected speed. It has an entrapment detection means 116 for detecting an entrapment of a foreign object by detecting a decrease in the speed as compared with the value. The output of the pinch detection means 116 is input to the other input terminal of the AND gate 114. The output of the AND gate 114 is input to the safety control operation command means 118. The safety control operation command means 118 controls the operation command means 117 when the pinch detection signal is input to perform the safety control operation. . Here, control is performed to operate the window glass in a direction of opening 12 cm from the opening / closing position at that time.

According to the power window device having such a configuration, when the motor 11 starts rotating, a pulse signal is output from the motor rotation sensor MRS to the microcomputer 100.
Is input to Then, based on the signal interval of the pulse signal, the motor rotation speed is determined by the motor rotation speed detection means 115.
Is detected, and when this becomes smaller than the reference speed, the pinch detection means 115 outputs a pinch signal of a foreign substance. In this case, the absolute speed and the relative speed are used as the rotation speed of the motor.

On the other hand, the opening / closing direction detecting means 110 uses the pulse signal from the motor rotation sensor MRS to
, That is, the opening and closing direction of the window. This means that a pair of Hall elements 13a,
Since pulse signals which are shifted from each other by 1/4 period from 13b are output, the rotation direction can be detected by utilizing the phase difference between these pulse signals. Window open / close position detecting means 1
In step 11, the value of a built-in counter is adjusted based on the opening / closing direction and the motor rotation amount, and the current window opening / closing position is detected from the value of the counter. The safety control area determination means 112 determines whether or not the current window is within the safety control area based on the output of the window opening / closing position detection means 111. When the current window is within the safety control area, the signal is AND gated. Output to 114.

In the determination of the safety control area, the window absolute position detecting means 113 detects a position near the fully closed state of the window with high accuracy based on a signal from the window movement sensor WTS, and determines the detected value in the safety control area. Means 11
By inputting the value to 2, the determination can be performed with high accuracy. The window absolute position detecting means 113 is configured to detect the window absolute position by counting the pulse signal from the window movement sensor WTS using, for example, a counter in the same manner as the opening / closing position detecting means 111. can do.

The pinch detection signal is input to the AND gate 114, and is input to the safety control operation instruction means 118 through the AND gate 114 according to a signal from the safety control area determination means 112. Safety control operation command means 1
Numeral 18 operates the operation command means 117 based on the input signal to execute a safety control operation. At the time of this safety control operation, the operation command means 117 is
Then, the polarity of the power supply to the motor 11 is reversed via the motor 2, and the motor is rotated in the reverse direction to open the window glass by a predetermined amount (12 cm) and then stop. Thereby, the entrapment is released, and safety is ensured.

Here, the window movement sensor WTS outputs a pulse signal of a higher frequency than the motor rotation sensor MRS even if the ring magnet 20 is configured to have multiple poles, even if it is decelerated and rotated by the worm mechanism.
Therefore, the window absolute position detecting means 113 is moved integrally with the wire 4 moved along with the pulley 18 by using the high frequency pulse signal to rotate the motor after passing through the damper 16. The movement amount of the window glass 6 can be detected with high accuracy, and the release region of the safety control operation in the safety control region determination means 112 can be managed with high precision.

Further, since the window movement sensor WTS detects the amount of rotation after the rotation force from the motor 11 has passed through the damper 16, even if the damper 16 is twisted in the rotation direction, the window movement sensor WTS can detect the rotation of the window. No error occurs in the detection of the movement amount, and the absolute position of the opening and closing of the window can be detected with high accuracy. FIG. 4 shows a signal waveform output from each sensor. FIG. 3A shows a motor rotation sensor M.
FIG. 4B shows a signal waveform output from the RS and a signal waveform output from the window movement sensor WTS. The reference numerals shown in each figure correspond to the Hall elements.

FIG. 5 is a view showing a second embodiment of the present invention. Here, an example is shown in which the window movement sensor of the first embodiment is constituted by a potentiometer. The motor rotation sensor is the same as that of the first embodiment. In the figure, a potentiometer 30 is attached to one side of a rail 2 of a power window device, and the potentiometer 30 is operated by a slider 3 when the window is moved to a position near a fully closed state.

As shown in FIG. 6 (a), the potentiometer is provided with a resistor 32 on a substrate 31, an actuator 34 is slidably provided in a casing 33 covering the substrate 31, To be held in a state of being urged. The operating rod 34 a protruding from the actuator 34 is protruded through a hole in the casing 33 so as to be in contact with the slider 3. Further, the actuator 34 is provided with a contact piece 35 that slides while being in contact with the surface of the resistor 32. In the potentiometer 30, the movement amount of the actuator 34 is output as a change in resistance value, and the movement amount and the change characteristic of the resistance value are, for example, linear characteristics.

In the apparatus of this embodiment, the pinching in the window is performed based on the signal output from the motor rotation sensor MRS as in the first embodiment. In addition, when the window is closed to a state where the window is almost fully closed, the slider 3 integrated with the window glass 6 abuts the operating rod 34a of the potentiometer 30 to move the actuator 34 integrally. The contact piece 3
Since the resistance value output through 5 is changed, the absolute position of the window glass, that is, the absolute position of the window opening / closing is detected based on this resistance value.

[0022] In this case, as shown in FIG. 6 (b), constituting a closed circuit in the potentiometer 30 and the power supply + B, it is configured so as to measure the voltage drop V _X by the potentiometer, as shown in FIG. 6 (c) Output characteristics can be obtained. That is, when the full stroke of the potentiometer 30 is 25 mm, the effective stroke is set to 15 mm by cutting both sides by 5 mm. Then, one end of this effective stroke is set to the fully closed position of the window,
A window position within a range of 5 mm is detected with high accuracy by a potentiometer. Therefore, if the voltage when the window is fully closed is set as the reference voltage V ₀ , the absolute position of the opening and closing of the window is determined as the reference voltage V ₀ and the detected voltage V _x
Can be detected by the voltage difference from Here, since the potentiometer 30 continuously detects a change in the absolute position of the opening and closing and continuously outputs a voltage value, the voltage difference can be finely measured, and a method of detecting based on a pulse signal obtained from a Hall element is used. Also enables highly accurate detection. For example, in this embodiment, a dimension of about 4 mm can be detected with high precision, and the release region of the safety control operation can be managed with high precision. For reference, FIG. 7 shows an operation flow of the power window including a safety control operation using the motor rotation sensor MRS and the window movement sensor WTS in this embodiment.

As described above, in this embodiment, there is no error in the absolute position of the window opening / closing due to the twisting in the rotational direction by the damper, as in the first embodiment.
Further, since the movement amount of the window glass is directly detected without passing through the wire 4 or the pulley 5, the window movement amount due to the looseness of the wire 5 or the slip between the pulley 5 and the wire 4 or the opening / closing of the window. The position detection error is eliminated, and the position management can be performed with higher accuracy than in the first embodiment. In this embodiment, since the window opening / closing position other than the effective stroke of the potentiometer 30 does not require high-precision management, a signal obtained from the motor rotation sensor MRS is used. In this case, to detect the position of 15 mm or more from the fully closed state of the window,
The output of the motor rotation sensor MRS is used.

[0024]

As described above, the present invention comprises means for detecting the amount of movement of the window, apart from means for detecting the rotational state of the motor for opening and closing the window,
The window open / close absolute position can be detected based on the detected window movement amount, and particularly the window open / close absolute position in the vicinity of the fully closed state of the window can be detected with high accuracy. There is an effect that the power window device can be controlled with high accuracy and a highly safe power window device can be obtained.

[Brief description of the drawings]

FIG. 1 is a partially exploded perspective view of a main part of a power window device of the present invention.

FIG. 2 is a schematic configuration diagram of a power window device to which the present invention is applied.

FIG. 3 is a circuit configuration diagram of a power window device including a motor and each sensor.

FIG. 4 is a signal waveform diagram of each output of a motor rotation sensor and a window movement sensor.

FIG. 5 is a perspective view of a main part of a power window device according to a second embodiment of the present invention.

FIG. 6 shows the internal structure of a potentiometer, its connection circuit,
FIG. 6 is a diagram illustrating output voltage characteristics corresponding to window open / close positions.

FIG. 7 is a flowchart showing the operation of the second embodiment for reference;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Power window drive part 11 Motor 12 Circular magnet 13a, 13b Hall element 16 Damper 20 Multipolar magnet 21a, 21b Hall element 30 Potentiometer MRS Motor rotation sensor WTS Window movement sensor

Claims (1)

(57) [Scope of request for utility model registration] 1. A window is opened and closed by a motor,
In a power window device including a safety device that performs a safety control operation by detecting pinching of a window, a power window device includes a unit that detects a rotation state of the motor, and a unit that detects a moving amount of the window. Detects pinching and window open / close movement position based on rotation state,
A power window device including a safety device, wherein an absolute position of the window is detected based on the detected amount of movement of the window.