JP2003336444A - Vehicle power window device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle power window device having a safety device for quickly detecting any obstacle caught in a window pane to reduce the obstacle load, while making it possible to control with high precision an area where safety control action is canceled. <P>SOLUTION: The power window device comprises a window pane full closure detecting means 2 for detecting the fully closed condition of a window pane; a first obstacle detecting means for detecting any obstacles at all times according to pulses transmitted from an encoder 4 provided at a motor 3 adapted for closing the window pane; a timer 5 for measuring the detection masking period of the encoder 4 during which the first obstacle detecting means cannot detect obstacles after the motor 3 starts to operate; a second obstacle detecting means for detecting any obstacles upon detecting a current through the motor 3 during the detection masking period; and a reversing means for reversing the motor 3 when either the first or second obstacle detecting means detects an obstacle. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle power window device which is applied to a vehicle such as an automobile and opens and closes a window glass by a motor or the like. The present invention relates to a vehicle power window device including a safety device.

[0002]

2. Description of the Related Art Conventionally, in a power window device for an automobile, a window or a window is opened / closed by a drive source such as a motor, so that a hand, a head or an object may be caught between the window glass and the window frame. . Therefore, various proposals have been made that include a safety device that detects such entrapment of foreign matter and stops the closing operation of the window glass or opens the window glass to perform a safety control operation against entrapment of foreign matter. ing.

There are generally the following two means for detecting the entrapment of foreign matter. The first foreign matter entrapment detection means measures the rotational driving state of the motor, which is correlated with the opening / closing speed of the window glass, as described in, for example, JP-A-11-256920, and the rotational speed of the motor is When the value becomes lower than a certain reference value, that is, when the load applied to the window glass and the motor increases due to the entrapment of foreign matter and the rotation speed decreases, the magnet provided in the deceleration gear of the motor and the magnet A means for detecting entrapment of a foreign substance is provided by using a pulse signal from the hall element.

The second foreign matter entrapment detection means is provided with, for example, a limit switch for detecting the fully closed state of the window glass and the opening of the window glass. The limit switch detects that the window glass is open. While detecting
When the current of the motor that opens and closes the window glass is detected and the current rises above a predetermined threshold value, it is determined that the foreign matter is caught and the load applied to the window glass and the motor increases due to the foreign matter being caught, and the rotation has stopped. It is a means for detecting the entrapment of foreign matter.

In such a detection method, the friction resistance between the window glass and the window frame is increased due to dust and foreign matter entering the window frame, environmental changes, deterioration of the window frame, etc., and the opening / closing speed of the window glass is reduced. At this time, the decrease in the closing speed of the window glass may be erroneously detected as a foreign object being caught, and the safety control operation may operate to open the window, which may prevent the window glass from closing.

[0006]

In order to avoid this, in the invention disclosed in the above-mentioned publication, the open / closed position of the window glass is constantly detected by utilizing the rotation amount of the motor, and the fully closed state of the window glass is obtained. In the vicinity of, the safety control operation release area is provided so that the safety control can be released and the window glass can be completely closed. It is important to set the release area to an extremely small size area in order to prevent the fingers or the like from being pinched by a child. Specifically, the release area has a size of about 4 mm before the window glass is fully closed.

However, in an actual vehicle power window device, since the rotational force of the motor is transmitted to the window glass via the gear mechanism, the wire / pulley mechanism, etc., the damper provided in the gear mechanism operates and rotates. When the directional twist occurs, there is a deviation in the correlation between the rotation amount of the motor and the opening / closing position of the window, which makes it impossible to accurately control the release area to the above-described dimension.

In the invention described in the above-mentioned publication, the multipolar magnet is decelerated by rotating the third gear via the first gear and the second gear on the output shaft of the motor. However, there is a problem that the rotation is slow and the number of pulse signals generated when the output shaft makes one rotation is limited and cannot be increased so much. Furthermore, there are many variations between the pulses. The resolution of the encoder in the vehicle power window device having such a structure is generally 0.5 to 0.8 mm / 1 pulse per 1 pulse (1/2 cycle),
The pulse interval is wide, and the detection time from when the window glass pinches a foreign object to when it detects that the foreign object is pinched is slow.

Therefore, the vehicle power window device is
There is a problem in that there is a time from when the window glass catches the foreign matter until it detects the trapping, and even if the foreign matter is caught in the window, the window glass continues to operate and presses the foreign matter, resulting in a large sandwiching load. As described above, the conventional vehicle power window device has a problem that a load applied to the foreign matter sandwiched by the window glass is large between the time when the foreign matter is caught and the time when the window glass is inverted.

Further, in the vehicle power window device for detecting the entrapment of the foreign matter by the encoder means, when the entrapment of the foreign matter occurs immediately after the power window switch is operated UP, the rotation of the motor is small, so the encoder detects the entrapment of the foreign matter. There are things you can't do. In this case, if a foreign object is caught in the window glass and stopped immediately after the motor starts, the motor stops before the pulse is generated and the pulse signal is not generated. For this reason, there occurs a problem that the motor is stopped before the pulse signal is in a state where the foreign matter is caught. In this case, the motor is locked and the current continues to increase.

Further, in the vehicle power window device for detecting the entrapment of foreign matter by detecting the electric current of the motor,
Although the rotation of the motor is transmitted to the window glass via the gear mechanism or wire / pulley mechanism, it deteriorates after long-term use, and wear of the gear or pulley or wire extension causes a load on the motor rotation. Or the friction resistance between the weather strip of the window frame and the window glass, or snow or rain enters between the weather strip and the window glass. There is a case that the load current to the sensor increases and it is erroneously detected that foreign matter is caught. In this case, there is a problem that the window glass cannot be closed completely.

An object of the present invention is to quickly detect the entrapment of foreign matter by a window glass to reduce the entrapment load, and
It is an object of the present invention to provide a power window device for a vehicle, which is equipped with a foreign matter pinching safety device capable of managing the release region of the safety control operation with high accuracy.

[0013]

SUMMARY OF THE INVENTION The present invention has been devised to solve the above-mentioned problems of the prior art. The invention of claim 1 is a window glass for detecting the fully closed state of the window glass. A first entrapment detection unit that detects entrapment of a foreign matter by a pulse transmitted from a closed state detection unit and an encoder provided in a motor for opening and closing a window glass, and the first entrapment detection unit detects the entrapment of a foreign matter. In the detection mask period zone of the encoder immediately after the start of the motor, which is not possible, the second entrapment detection means for detecting the entrapment of the foreign matter by detecting the current of the motor, and the first or the second entrapment detection means for detecting the foreign matter And a reversing means for reversing the motor when a pinch is detected, and a power window device for a vehicle.

According to a second aspect of the present invention, in the first aspect of the present invention, the second pinching means is for a predetermined time from when the ascending side contact of the power window switch for raising and lowering the window glass is turned on. It is operated by a timer that measures.

According to a third aspect of the present invention, in the first or second aspect of the invention, the first pinch detection means installs the encoder on an armature shaft or an output shaft of the motor, and the encoder is an N-pole S pole. It is composed of a high-resolution magnet with many poles magnetized, and a magnetic sensing element that detects rotation of the high-resolution magnet and is installed in a non-rotating portion of the motor.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the drawings. FIG. 1 is a system block diagram of a vehicle power window device according to the present invention. The power window device 1 includes a window glass fully closed state detecting means 2 and a first entrapment detecting means B.
A timer 5, a second pinch detection means (motor current detection circuit 6) C, and an inversion means 7.

The window glass fully closed state detecting means 2 is means for detecting the fully closed state of the window glass 14, for example, the window frame 15.
It consists of a limit switch installed on the inner top of the. The first entrapment detecting means B constantly detects entrapment of a foreign object sandwiched between the window frame 15 and the window glass 14 by a pulse transmitted from an encoder 4 provided in a motor 3 for opening and closing the window glass 14. Is a means to do. The timer 5
Is for measuring the time of the detection mask period of the encoder 4 in which the motor 3 starts to operate and the first entrapment detection means B of the encoder 4 cannot detect entrapment of a foreign substance.

The second entrapment detection means (motor current detection circuit 6) C detects the electric current of the motor 3 during this detection mask period, and if this electric current exceeds the threshold value d, it is determined that the foreign matter is entrapped. It is a means for detecting the entrapment of foreign matter. The reversing means 7 drives the motor 3 when the first or second entrapment detecting means B, C detects entrapment of a foreign matter.
Is a means for reversing and releasing the pinched state.

The timer 5 measures a predetermined time from when the ascending side contact of the power window switch 8 for raising and lowering the window glass 14 is turned on, and operates the second trapping detecting means C. The first entrapment detection means B is composed of an encoder 4 installed on an armature shaft or an output shaft of the motor 3. The encoder 4 has N
It is composed of a high-resolution magnet having a large number of S poles magnetized, and a magnetic sensing element such as a Hall element which detects rotation of the high-resolution magnet and is installed in a non-rotating portion of the motor 3.

FIG. 2 is a schematic configuration diagram of the drive portion 1a of the power window device 1 to which the present invention is applied, and description will be given based on this diagram. In the lower body of the window glass 14 of the automobile,
An opening / closing mechanism 9 for the window glass 14 is provided. In this opening / closing mechanism 9, two rails 10 are vertically extended so as to face each other, and the rail 10 holds the window glass 14 slidably in the vertical direction. A wire 12 is connected to the rail 10, and the wire 12 is wound around pulleys (not shown) arranged at the upper and lower ends of the opening / closing mechanism 9 and connected to the power window glass drive unit 13. When the motor 3 provided in 13 is driven, the slider 1
1 is moved up and down. In addition, the window glass 14 on the rail 10
Is attached and moved up and down together with the slider 11 to open and close the window glass space defined by the window frame 15.

FIG. 3 shows the drive unit 13 for the power window.
FIG. 3 is a schematic view of the internal structure of FIG. In the figure, 3 is a motor as a drive source,
On the other end side of the armature shaft 3a having the coil 3b of the motor 3 wound on one end side, a circular magnet 16 is provided which is magnetized by alternately dividing a large number of S poles and N poles in the radial direction. Magnet 1
6, for example, as shown in FIG. 4, S poles and N poles are alternately divided into eight,
It consists of high resolution magnets divided into 12 or 16 divisions. In the non-rotating portion around the magnet 16, the magnet 16
A magnetic sensing element 17 including a Hall IC or the like for detecting the rotation of is installed.

The magnetic sensing element 17 is arranged at a position outside the circumference of the magnet 16, and the magnet 16 and the magnetic sensing element 17 constitute an encoder 4 for detecting the rotation of the motor 3.
As shown in FIGS. 4A, 4B, and 4C, the magnet 16 is formed of a high-resolution magnet and installed on the armature shaft 3a, so that the rotation of the motor 3 can be detected finely and quickly.

In the encoder 4, the magnetic sensing element 17 attached to the non-rotating portion of the motor 3 changes the N pole → S pole → N pole of the magnet 16 rotating in response to the rotation of the motor 3.
7 is a sensor for detecting.

A worm 18 is attached to the other end of the armature shaft 3a of the motor 3 and meshed with a worm wheel (not shown). The worm wheel rotates a pulley to drive the wire 12. The wire 12 moves integrally with the window glass 14.

The motor 3, which is the rotation source, has an armature shaft 3
When the worm 18 integrated with a is rotated, the worm 18
Moves the wire 12 that meshes with the worm wheel and moves integrally with the window glass 14 via the pulley. Magnet 16
The magnetic sensing element 17 constitutes an encoder 4 for detecting the amount of rotation of the armature shaft 3a that moves integrally with the window glass 14, in other words, the amount of movement of the window glass 14 that is integrated with the wire 12 connected thereto. The power window device 1 controls based on the position information of the window glass 14 by the encoder 4.

FIG. 5 is an electric circuit diagram of the vehicle power window device, which is installed inside the switch case 22 of the power window switch 8. In the figure, the motor 3 is for opening and closing the window glass 14 described above, and is connected to the microcomputer 19 through the reversing means 21. The motor 3 operates each operation switch section of the power window switch 8, and the microcomputer 1
The inverting means 21 composed of a relay or the like in response to the signal from 9 causes the window glass 14 to open and close by rotating in the normal direction.

When the motor 3 is operating, the motor current detection circuit 6 monitors the rotation condition from the current.
The torque of the motor 3 increases / decreases in proportion to the increase / decrease in current as shown in FIG. 6 (b). The motor current detection circuit 6 monitors the current, and the microcomputer 19d monitors the motor 3
The driving force is stable.

The power window switch 8 is a window glass opening / closing switch installed in, for example, the armrests of the driver's seat, passenger seat, rear seat left and right doors, and the up switch 8a, the auto up switch 8b, and the down switch. 8c and an auto down switch 8d. The up switch 8a is turned on, for example, only while the operation knob is being pulled up by one step, and the window glass 1 is manually operated.
4 is a switch unit for raising 4. The auto-up switch 8b is a switch unit that is turned on by, for example, pulling up the operation knob to two steps to automatically raise the window glass 14 to the fully closed position. The down switch 8c is, for example, a switch unit that is turned on only while the operation knob is being pushed down by one step to manually lower the window glass 14. The auto down switch 8d
Is a switch section that is turned on by pushing down the operation knob to the second stage and automatically raises the window glass 14 to the fully open position.

In the power window switch 8, fixed contacts of the up switch 8a, the auto up switch 8b, the down switch 8c, and the auto down switch 8d are connected to the microcomputer 19, and the movable contact is grounded. The power window switch 8 selects the opening / closing operation of the window glass 14, and the selection signal is input to the microcomputer 19. This power window switch 8
It is operated when opening and closing the window glass 14 automatically or manually. Further, based on a signal from the microcomputer 19, the motor drive circuit 20 including a relay controls the rotation of the motor 3.

Reference numeral 23 is a memory in which a threshold value or the like for judging that a foreign substance is caught is written, and is composed of, for example, an EEPROM or the like.

The temperature sensor 24 measures the temperature outside the vehicle and is connected to the battery via the resistor R1 and the constant voltage circuit 25. The resistor R2 is for voltage monitoring, one of which is connected to the battery and the other of which is connected to the microcomputer 19
Connected to. The resistor R3 is for voltage monitoring, one of which is connected to the battery and the other of which is connected to the microcomputer 1.
9 is connected.

The motor 3 is the above-mentioned motor for opening and closing the window glass 14 and is connected to the motor drive circuit 20. As shown in FIG. 6C, the torque of the motor 3 increases / decreases in inverse proportion to the temperature, and when the temperature decreases, the torque of the motor 3 increases. The temperature sensor 24 monitors this temperature, and the microcomputer 19d is designed to stabilize the driving force of the motor 3 against the temperature.

The torque of the motor 3 increases or decreases depending on the voltage of the battery as shown in FIG. 6 (a). That is, the torque of the motor 3 increases or decreases in proportion to the voltage of the battery,
Since the torque decreases as the battery voltage decreases, the constant voltage circuit 25 sets a constant voltage, and the resistors R2 and R3 and the microcomputer 19 monitor the voltage to be constant.

The torque of the motor 3 is shown in FIG.
As shown in (b), it increases or decreases depending on the current flowing through the motor 3. That is, the torque of the motor 3 increases or decreases in proportion to the current flowing through the motor 3, and the torque decreases as the current decreases.

A pulse signal from the encoder 4 for detecting the rotation of the motor 3 as a drive source of the power window device 1 and the motor current detection circuit 6 for detecting the current of the motor 3 is input to the microcomputer 19. To be done.

The microcomputer 19 of the power window device 1 detects the rotation speed of the motor 3 by the encoder 4 and raises the window glass 14 by the motor 3 to close the window glass 14 if the pulse width exceeds a predetermined value. If the current of the first pinch detection means B that determines that a foreign substance is trapped and the motor 3 is monitored to raise the window glass 14 by the motor 3 to close the window glass 14 exceeds a predetermined threshold value d, the foreign substance is trapped. The second entrapment detecting means C for judging that the two entrapment detecting means C are included.

The first entrapment detection means B detects the cycle of the pulse signal output from the encoder 4 to detect the rotation direction and rotation condition of the motor 3. The fully closed state detecting means 2 for the window glass 14 is, for example, a limit switch that detects that the window glass 14 is fully closed. This limit switch is provided on the upper inner side of the window frame 15, and is turned on when the window glass 14 is open, and is turned off by being pressed by the window glass 14 when the window glass 14 is fully closed.

The fully closed state of the window glass 14 is detected by the fully closed state detecting means 2, and the encoder value at this position is set to 0.
After the initialization, the pulse signal when the motor 3 rotates in the forward direction is counted in the negative direction, and the pulse signal when the motor 3 rotates in the reverse direction is counted in the positive direction. It is composed of an up / down counter that detects the open / close position.

When the fully closed state detecting means 2 detects the fully closed state of the window glass 14, it is determined that the window glass 14 is fully closed, and the power window switch 8 is operated in the UP direction. Does not work either. When the fully closed state detecting means 2 does not detect the fully closed state of the window glass 14, it is determined that the window glass 14 is open, and the power window switch 8 is operated in the UP direction to raise the window glass 14.

The motor current detection circuit 6 switches the power window switch 8 to monitor the current of the motor 3 when the motor 3 is driven. The motor current detection circuit 6 cannot send a pulse signal because the motor 3 stops only when it slightly rotates when a foreign object is caught immediately after the power window switch 8 is operated in the UP direction. The encoder 4 may not be able to detect the entrapment of foreign matter. In such a case, the motor 3
The lock state of the motor 3 is detected by detecting the current of (3), and the motor 3 is reversed. In such a case, the encoder 4 does not generate a pulse because the rotation of the motor 3 is slight, and the motor 3 stops before the pulse is in a state of entrapment of foreign matter. The motor 3 is locked,
The current continues to increase.

When such a foreign substance entrapment cannot be determined, the dead time of the encoder 4 is measured by the timer 5, and the foreign substance entrapment is determined based on the current threshold value d set in the current information. Turn over to eliminate the load when pinching foreign matter.

FIG. 7 shows the current A of the window glass 14 and the motor 3.
It is a graph which shows the relationship with. In the steady state, the motor 3
The current average value of the current A is the value indicated by f in FIG. 7. When the window glass 14 moves to the upper end, which is the fully closed position, the fully closed state detecting means 2 detects that the window glass 14 has moved to the upper end, and even if the value of the current A increases, the value of the current glass A is large. Is due to the fact that it is fully closed, and it is determined that it is in the foreign object pinch detection detection area. When the window glass 14 is located at a position other than this, the foreign matter is caught, and the foreign matter is monitored. And the current A
Is increased from the steady-state current average value f to the margin g and reaches the entrapment detection threshold d, it is determined as the entrapment detection e.

The motor current detection circuit 6 detects an increase in the current of the motor 3 in the locked state, and when the current value A reaches the foreign matter entrapment detection threshold value d shown in FIG. 7, the foreign matter entrapment is detected by the microcomputer 19. When the microcomputer 19 determines that the foreign matter is trapped, the reversing unit 7 is activated and the opening / closing mechanism 9 lowers the window glass 14 to instantly release the foreign matter from the trapped state.

In this way, the so-called choi pushing operation that stops the motor 3 even if it is slightly rotated,
Even when the encoder 4 cannot detect the entrapment of the foreign matter, the entrapment of the foreign matter on the window glass 14 can be detected.

The operation of the power window switch 8 other than the pushing operation of the operation knob will be described. When the operation knob is pulled up, the motor 3 rotates. When the motor 3 rotates, the armature shaft 3a of the motor 3 rotates, and the magnetism of the high resolution magnet 16 causes the magnetic sensing element 17 to rotate.
The pulse signal is input from the encoder 4 to the microcomputer 19 by finely detecting.

The pulse signal is compared by the high resolution magnet 16 of the encoder 4 with the pulse of the encoder of the high resolution magnet in the reduction gear mechanism of the conventional motor shown in FIG. 8 (a) as shown in FIG. 8 (b). The pulse has a short period. Since the magnetic sensitive element 17 generally has a high response speed, the movement of the motor 3 can be accurately transmitted. Window glass 1
4 is one pulse of the motor 3, 0.01-0.2 m
Move about m. Then, the motor rotation speed detecting means of the microcomputer 19 detects the rotation speed of the motor 3 based on the signal interval of the small pulse signals, and when the rotation speed of the motor 3 becomes smaller than the reference speed, the first entrapment detecting means B for foreign matter. Outputs a pinch signal for foreign matter.

For example, FIG. 9 is a graph showing the relationship between the distance L1 that the window glass 14 moves after it has pinched a foreign substance and the load G that pinches the foreign substance at that time. Distance L1 moved after pinching a foreign object
And the load G1 at that time are substantially proportional. In the conventional power window device 1, the 0.5 to 0.8 mm window glass 14 moves with one pulse, so it takes time to detect the entrapment of a foreign object after the foreign object is caught, and the window glass 14 accordingly. The moving distance L1 is long and the load G
1 is also large, and it is expected that it will hurt human hands and break items.

According to the present invention, the encoder 4 is composed of the high-resolution magnet 16 installed on the armature shaft 3a of the motor 3, so that the movement of the window glass 14 can be monitored in small increments and the foreign matter can be pinched instantly with high accuracy. Upon detection, the motor 3 can be stopped and reversed. In the present invention, the entrapment of the foreign matter is instantly detected, so that the entrapment of the foreign matter can be detected and reversed at the point 1 shown in FIG. The sandwiched foreign matter has an instant from the time when the window glass 14 abuts and is sandwiched until the time when it is tightened, and the moving distance of the window glass 14 is set to a shorter distance n than before, and the foreign matter is caught before the sandwiching load increases. Since it can be detected and reversed, the pinching load G2 can be significantly reduced. The load G2 is
Even if the hand is pinched by the window glass 14 at 100 N or less, it does not hurt, and it is possible to solve the problem caused by the entrapment of foreign matter. As a result, the pinch is released and safety is ensured.

According to the present invention, only by installing the high resolution magnet 16 on the armature shaft 3a of the motor 3, it is possible to measure the measured values minutely and with high resolution, and to raise the cost with almost no increase in the cost. It is possible to solve the problem and improve the safety of the power window device 1.

When no foreign matter is present between the window glass 14 and the window frame 15, the window glass 14 rises smoothly and the fully closed state detecting means 2 detects that the window glass 14 is fully closed. Then, the power window device 1 is stopped.

The present invention is configured as described above, and the operation will be described in detail with reference to FIG. Steps S1 to S11 are flowcharts showing the second entrapment detection means C that detects the entrapment of a foreign substance by detecting the current of the motor 3, and steps S12 to S18 are
7 is a flowchart showing a first entrapment detection means B for detecting entrapment of a foreign substance by detecting a pulse transmitted from the encoder 4.

In step S1, the power window switch 1 is operated to start the operation of the power window device 1. Then, in step S2, initial setting is performed. In step S3, the power window switch 8 turns U.
The knob is operated in the P (up) direction to determine whether the up switch 8a is ON. In this way, in step S3, in other words, it is determined that the window glass 14 is rising and may be caught. If YES, the process proceeds to step S4. When the up switch 8a is OFF, it is determined that the foreign matter is not caught in the window glass 14, and the process proceeds to Return (return) in step S11 in the NO direction.

In step S4, the power window device 1
The motor 3 is operated by turning on the UP (up) output for raising the window glass 14, and the process proceeds to step S5. In the staple 5, the timer 5 interrupts at the same time when the up output in step S4 is turned on. In step 6, the first pinch detection means that takes in the result of A / D conversion of the electric current of the motor 3 operates, and the process proceeds to step S7.

In step S7, it is determined whether or not the window glass 14 entraps the foreign matter from the A / D conversion result captured in step S6 and the value exceeds the entrapment detection threshold value d. When it is determined that the entrapment detection threshold value d has been exceeded, it is determined that a foreign object is trapped in the window glass 14, and the process immediately proceeds to step S8 to reverse the motor 3 and lower the window glass 14. When it is determined that the entrapment detection threshold value d has not exceeded, the foreign matter is detected by the window glass 14
It is determined that they are not sandwiched between the two, and the process proceeds to step S9 in the NO direction. In this way, it is possible to prevent the foreign matter from being caught by determining whether the foreign matter is caught in step S7 and lowering the window glass 14 in step S8.

In step S9, it is determined whether or not a mask period has passed in which the timer 5 cannot detect the entrapment of foreign matter by the first entrapment detecting means B. When the mask period has elapsed, the first entrapment detection means B can quickly detect the entrapment of foreign matter in small steps, so step S1 in the direction of Yes
Go to 0. If the mask period has not elapsed, the process proceeds to the NO direction, and after the mask period ends, the next step S10
Proceed to.

In step S10, the operation of the second entrapment detection means C for detecting entrapment of a foreign substance by the electric current of the motor 3 is stopped, and the process proceeds to Rerun (return) in step S11.

In step S12, the power window device 1
Starts operating. In the next step S13, it is determined whether the power window switch 8 is operated in the UP (up) direction and the up switch 8a is ON. If YES, the process proceeds to step S14. Up switch 8a is OF
In the case of F, it is determined that the foreign matter is not caught in the window glass 14, and the NO direction Step S18 Return
Go to (Return).

At the same time when the up switch 8a in step 13 is turned on, the first pinch detection means operates to take in the pulse transmitted from the encoder 4, and step S1
Go to 6. In step S16, the period of the pulse from the encoder 4 is monitored, and it is determined whether the period exceeds a threshold value. When the pulse exceeds the threshold value for determining that a foreign object is trapped, it is determined that the foreign object is trapped in the window glass and the process proceeds to step S17 in the Yes direction, the motor 3 is reversed to lower the window glass, and the window is released. Let When the pulse cycle does not exceed the threshold value, it is determined that the foreign matter is not caught in the window glass, the process proceeds to step S18 in the No direction, and is returned.

According to the present invention, as described above, in the mask period in which the first entrapment detecting means B detects the entrapment of the foreign matter by the pulse from the encoder 4 and the first entrapment detecting means B cannot detect the entrapment of the foreign matter, Since the second pinch detection hand which detects the pinch of the foreign substance by the current of the motor 3 detects the pinch and the motor 3 is reversed, the foreign substance pinch detection accuracy can be improved.

[0060]

Since the present invention is constructed as described above, it has the following effects. According to a first aspect of the invention, there is provided a window glass fully closed state detecting means for detecting a fully closed state of the window glass, and a pulse transmitted from an encoder provided in a motor for opening and closing the window glass to detect foreign matter trapping. (1) Entrapment detection means and a timer that starts time measurement at the time of starting the motor, and the first entrapment detection means cannot detect entrapment of foreign matter, and measures a detection mask period of an encoder immediately after the motor is started. And second entrapment detection means for detecting entrapment of foreign matter by detecting the current of the motor during the detection mask period.
A vehicle power window device including a reversing unit for reversing the motor when the first or second entrapment detecting unit detects entrapment of the foreign substance, thereby quickly detecting the entrapment of the foreign substance by the window glass. It is possible to reduce the pinching load instantaneously to reduce the pain when the human body is in a pinch and to manage the release area of the safety control operation with high accuracy. If the foreign matter cannot be caught, the dead zone of the encoder is measured by a timer, and the foreign matter is judged based on the threshold value set in the current information, and the window is reversed to reduce the load during pinching. To do.

According to a second aspect of the present invention, in the first aspect of the invention, the timer measures from a time when a rising contact of a power window switch for raising and lowering the window glass is turned on to a predetermined time. By operating the second entrapment detection means, the entrapment of foreign matter can be detected more reliably, and various problems due to entrapment can be prevented,
The safety of the power window device can be improved.

According to a third aspect of the present invention, in the first or second aspect of the invention, the first pinch detection means installs the encoder on an armature shaft or an output shaft of the motor, and the encoder is an N-pole S pole. A high-resolution magnet with many poles magnetized and a magnetic sensitive element that detects the rotation of the high-resolution magnet and is installed in a non-rotating part of the motor to instantly detect the entrapment of foreign matter, and At times, it is possible to prevent foreign matter from being caught by a heavy load, and improve the safety of the power window device.

[Brief description of drawings]

FIG. 1 is a drawing showing an embodiment of the present invention and is a system block diagram.

FIG. 2 is a drawing showing an embodiment of the present invention and is an explanatory diagram showing an outline of a power window device.

FIG. 3 is a drawing showing an embodiment of the present invention and is a perspective view showing a positional relationship between a magnet and a magnetic sensing element installed in a motor.

4A and 4B are views showing an embodiment of the present invention, in which FIG. 4A is a schematic view showing a magnet divided into eight parts, and FIG.
FIG. 3 is a schematic diagram showing a state in which the magnet is divided, and FIG. 7C is a schematic diagram showing a state in which the magnet is divided into 16 parts.

FIG. 5 is an electric block diagram showing the embodiment of the present invention.

6A and 6B are drawings showing an embodiment of the present invention, in which FIG. 6A is a graph showing the relationship between the motor torque and voltage, FIG. 6B is a graph showing the relationship between the motor torque and current, and FIG. )
Is a graph showing the relationship between motor torque and temperature.

FIG. 7 is a drawing showing an embodiment of the present invention and is a graph showing the relationship between the current of the motor and the position of the window glass.

FIG. 8 is a view showing an embodiment of the present invention and is a graph comparing a pulse of a motor of a conventional power window device and a pulse of a motor of a vehicle power window device according to the present invention.

FIG. 9 is a diagram showing an embodiment of the present invention and is a graph showing a relationship between a load when a foreign substance is caught in a power window device and a movement distance of a window glass.

FIG. 10 is a flow chart showing an embodiment of the present invention.

[Explanation of symbols]

2 Window glass fully closed state detection means 3 motor 3a Amateur axis 4 encoder 5 timer 8 power window switch 14 window glass 17 Magnetic element 21 Inversion means B first pinch detection means C second pinch detection means

Continued front page    F term (reference) 2E052 AA09 CA06 EA14 EB01 GA08                       GA10 GB06 GC06 GC07 GD03                       GD09 HA01 KA15                 2F063 AA35 BA11 CA09 CA12 DA01                       DA05 DD08 EA03 GA52 KA02                       KA04 LA09 LA19 LA20                 3D127 AA02 BB01 CB05 CC05 DF03                       DF35

Claims (3)

[Claims] 1. A window glass fully closed state detecting means (2) for detecting a fully closed state of the window glass (14), and an encoder (4) provided on a motor (3) for opening and closing the window glass (14). A first entrapment detection means (B) for detecting entrapment of a foreign matter by a pulse transmitted from the motor, and a first entrapment detection means (B) which cannot detect the entrapment of the foreign matter immediately after the motor (3) is started. During the detection mask period of the encoder (4), the motor (3)
Second entrapment detection means (C) for detecting the entrapment of the foreign matter by detecting the electric current of the motor, and the motor when the entrapment of the foreign matter is detected by the first or second entrapment detection means (B), (C). A power window device for a vehicle, comprising: a reversing means (21) for reversing 3). 2. The invention according to claim 1, wherein the second
The entrapment detection means (C) is operated by a timer (5) that measures a predetermined time from when the ascending side contact of the power window switch (8) for raising and lowering the window glass (14) is turned on. Power window device for vehicles characterized by. 3. The invention according to claim 1 or 2, wherein the first entrapment detection means (B) is the motor (3).
The encoder (4) is installed on an amateur shaft (3a) or an output shaft of the encoder, and the encoder (4) has a high resolution magnet (16) magnetized with a large number of N poles and S poles, and the high resolution magnet (16). And a magnetic sensing element (17) which detects rotation of the motor and is installed at a non-rotating portion of the motor (3).