JPH0220398Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a window glass electric drive device that automatically opens and closes the window glass of automobiles, etc. In particular, the present invention relates to a window glass electric drive device that automatically opens and closes the window glass of automobiles, etc. The present invention relates to a safety device for when a foreign object such as a human body is caught between the window glass and the window frame while the window glass is being raised in an electric drive device.

Various types of safety devices have been known so far. For example, an upper limit switch and a lower limit switch are provided, and a detection means for detecting that a part of the human body is caught in the middle of the rising of the window glass is provided on the upper edge of the window glass or the window frame. There is a device in which the window glass is lowered to the fully open state and the lower limit switch is released, the window glass is raised again, and when the window is fully closed, the upper limit switch is released and the motor is stopped, but this device requires upper and lower limit switches. This increases the number of installation steps, and requires wiring for both the upper and lower limit switches and the detection means on the window side, resulting in complicated wiring and increased costs. In addition, a rotation detection means is added to the motor to detect rotation, and the control relay circuit is self-holding to perform a one-touch operation. There is also a known safety device in which the window glass is lowered to a fully open state by reversing the rotation, and when the motor locks and stops at the lower limit, a rotation detecting means operates to cut off the power to the motor. In the case of this device, the window glass stops when it is fully open, so after removing the part of the human body that is stuck between the window glass and the window frame, you have to operate the switch again to raise the window glass, which is the original purpose. This is not only troublesome, but also has drawbacks such as the need to install an upper limit switch that cuts off current to prevent the motor from reversing by locking the motor when the window glass is raised and fully closed during normal operation. Ta.

The present invention was devised in view of the above-mentioned drawbacks, and it is possible to avoid overloading the motor without using upper and lower limit switches or detection means to detect if a part of the human body is caught in the middle of the window glass being raised. The overload detection switch, which operates (opens) when By re-elevating the device, safety can be ensured even if a part of the human body is caught between the window glass and the window frame, and it also has excellent operability and reduces installation man-hours. The purpose of the present invention is to provide an automobile window glass electric drive device that can simplify wiring.

In order to achieve the above object, the structure of the automobile window glass electric drive device according to the present invention is such that both ends of a reversible motor are connected to movable contacts of a lifting relay and a lowering relay that switch and connect one side and the other of the power source, respectively. At the same time, each self-holding contact is connected in series with the excitation coil of each of the raising and lowering relays, and the raising side and lowering side which become open when an overload is applied to the motor when the window glass is raised or lowered. A vehicle in which a self-holding circuit of a rising relay and a descending relay is formed by connecting a side overload detection switch, respectively, and the driving of a reversible motor is controlled by exciting each of the excitation coils by switching on and turning on a one-touch operation switch. In the window glass electric drive device, a first timer is started when the upward overload detection switch is opened, and a first timer is closed when the first timer is started and excites the excitation coil of the downward relay. a second timer that starts when the first timer expires; a second switch that closes when the second timer starts and energizes the excitation coil of the ascending relay; The third switch means is connected to each self-holding circuit and becomes open when the first switch means or the second switch means is closed.

The present invention will be described below with reference to an embodiment shown in the drawings.

In FIG. 1, 1 is a battery that serves as a power source. Reference numeral 2 designates a one-touch operation switch that automatically returns to a neutral state, and has a grounded movable contact 2a, a rising fixed contact 2b, and a lowering fixed contact 2c. 3
is a lifting relay that is activated when the movable contact piece 2a of the operation switch 2 is put into the lifting fixed contact 2b side, and controls the rotation of the reversible motor 11 for driving the window glass in the lifting direction; One end of the excitation coil 3a is connected to the battery 1, and the other end is connected in series with a diode 44, a normally open self-holding contact 3b, and a normally closed rising side overload detection switch 5 to form a self-holding circuit for the rising relay 3. Form 3f. Reference numeral 4 denotes a descending relay that is activated when the movable contact piece 2a is switched to the descending fixed contact 2c to control rotation of the motor 11 in the descending direction, and one end of the excitation coil 4a of the relay 4 is connected to the battery 1. At the same time, the other end is connected in series with a normally open self-holding contact 4b and a normally closed downward side overload detection switch 6.
are connected to form a self-holding circuit 4f of the lowering relay 4. The respective self-holding circuits 3f and 4f are commonly connected in series with a transistor 7, which serves as a third switching means, and whose collectors are commonly connected to the overload detection switches 5 and 6, and whose bases are connected in series. Resistors 9 and 1 that divide the power supply voltage
Connect to the voltage dividing point A of 0, and connect the emitter to diode 8.
Ground through. In the illustrated embodiment, the transistor 7 is commonly connected in series with each of the self-holding circuits 3f and 4f, so that only one transistor 7 is provided.
Transistors 7, 7 serving as third switching means may be connected in series to the self-holding circuits 3f, 4f, respectively. In this case, the respective transistors 7, 7
The collectors of each are connected to the overload detection switches 5 and 6, the bases of each are connected to the voltage dividing point A, and the emitters of each are grounded via diodes 8 and 8, respectively.

Further, the overload detection switches 5 and 6 on the rising side and the falling side are opened only when a blocking resistance is applied to the window glass while the window glass is rising or falling, respectively, and the reversible motor 11 is overloaded. is in a closed state and is a known type, for example, a link mechanism (not shown) that converts the rotational force of the reversible motor 11 into vertical movement of a window glass (not shown). The link mechanism includes, for example, a fixed base fixed to a door panel, a movable base rotatably attached to the fixed base and fixed with a reversible motor 11, and a window glass operating lever driven by the reversible motor 11. By interposing a spring between the bases and providing upward and downward side overload detection switches 5 and 6 on the fixed base opposite to the cam provided at the lower end of the movable base, blocking resistance was applied to the window glass. At this time, the dynamic energy of the reversible motor 11 moves the movable base in the direction that displaces the spring, and the cam provided at the lower end of the movable base opens the overload detection switches 5 and 6 on the upward and downward sides, respectively. It is something. Furthermore, by reversing the reversing motor 11, the motor 1
Since the overload state of No. 1 is released, each overload detection switch 5, 6 returns to the closed state. 3e is a fixed contact on the power side of the lifting relay 3, 3d is a fixed contact on the ground side, and 3c is a movable contact connected to one end of the motor 11 and in contact with the fixed contact 3d on the ground side when the excitation coil 3a is not excited. It is a contact piece.
4e is a fixed contact on the power supply side of the lowering relay 4;
d is a fixed contact on the ground side, and 4c is a movable contact piece connected to the other end of the motor 11 and in contact with the fixed ground contact 4d when the excitation coil 4a is not excited. 12 is a first timer that starts when the rising side overload detection switch 5 is opened;
14, resistance 15, 16, 17, 18, 19, 2
0, a capacitor 21 and an operational amplifier 22. 23 is a transistor, for example, which is closed by the start of the first timer 12 and serves as a first switch means for exciting the excitation coil 4a of the lowering relay 4; Its base is connected, and its collector is connected to the base of the transistor 7 via the diode 42 and also connected to one end of the exciting coil 4a.
27 is a second timer that starts when the time limit of the first timer 12 expires, and includes diodes 28, 29,
It consists of resistors 30, 31, 32, 33, 34, 35, a capacitor 36, and an operational amplifier 37. 38 is a transistor, for example, which is closed by the start of the second timer 27 and serves as a second switch means for exciting the excitation coil 3a of the ascending relay 3;
The base of the transistor 38 is connected to the connection point between the resistors 39 and 40, and its collector is connected to the base of the transistor 7 via a diode 43 and to one end of the excitation coil 3a. 41 is a capacitor.

Next, the operation of the above structure will be explained with reference to the time chart of FIG.

First, the case of raising the window glass will be explained. At time t ₁ , one-touch operation switch 2
When the movable contact piece 2a is inserted into the rising fixed contact 2b side, the excitation coil 3a is excited and the rising relay 3 is activated, and the movable contact piece 3c is connected to the power supply side fixed contact 3e.
Since the self-holding contact 3b is closed at the same time as switching to the side, the raising relay 3 is self-held even if the transistor 7 is turned on and the one-touch operation switch 2 is opened. At this time, the potential at point _B , which is the negative input potential of the operational amplifier 22, gradually decreases from the power supply voltage to the divided potential of the resistor 16 and resistor 15 as the capacitor 21 is charged, but the potential at point _A1 , which is the positive input potential, Since the point potential drops from the divided potential of the power supply voltage by the resistors 17 and 18 to approximately the ground potential, the output of the operational amplifier 22 is still at a low level and the transistor 23 is in an off state. Therefore, the transistor 7 maintains the ON state, the lifting relay 3 continues to hold, and the motor 11 connects the battery 1 power supply side fixed contact 3e, the movable contact piece 3c, the motor 11,
The movable contact piece 4c, the ground-side fixed contact 4d, and the grounding circuit cause the window glass to rotate normally and rise via a link mechanism (not shown) or the like. At time t ₂ while the window glass is rising, a foreign object such as a human body, such as a hand or neck, is caught between the window glass and the window frame (not shown), and the reversible motor 1
1 is locked, the rising side overload detection switch 5 is opened, the transistor 7 is turned off, the excitation to the excitation coil 3a is canceled, the movable contact piece 3c is restored to the ground side fixed contact 3d side, and power is supplied to the motor 11. Cut off. At this time, the potential at point _A immediately returns to the divided potential of resistor 17 and resistor 18 and becomes higher than the potential at point B, so the output of operational amplifier ₂₂ immediately becomes high level. The inversion of the output of the operational amplifier 22 from a low level to a high level means that the first timer 12 is started, and the start of the first timer 12 turns on the transistor 23, which is the first switching means. By doing so, the excitation coil 4a of the lowering relay 4 is energized, the lowering relay 4 is activated, and the movable contact piece 4c is connected to the power supply side fixed contact 4e.
Switch to the side. The reversible motor 11 includes a battery 1, a power supply side fixed contact 4e, a movable contact piece 4c,
Motor 11, movable contact piece 3c, ground side fixed contact 3
d. Reversed by the grounding circuit and the window glass lowers. Therefore, if a foreign object such as a human body is caught between the window glass and the window frame while the window glass is being raised, and the motor 11 is locked, the power supply to the motor 11 is immediately cut off, and the motor 11 is immediately reversed to remove the window glass. is descending. The reverse rotation of the motor 11 causes the upward side overload detection switch 5 to return and close. Furthermore, since the transistor 23 is on, the transistor 7 is off. The potential at point B starts to rise toward the power supply voltage after time t ₂ as the charge in the capacitor 21 is discharged through the resistor 16, and finally exceeds the potential at _point A at time t _{3 ,} and the output of the operational amplifier 22 becomes High level is reversed to low level. This means that the time limit of the first timer 12 has expired. Therefore, transistor 23 is turned off,
The excitation coil 4a is demagnetized, the movable contact piece 4c is restored to the ground side fixed contact 4d side, the power supply to the motor 11 is cut off, and the motor 11 is subjected to electromagnetic braking and suddenly stops.

Here, the _A2 potential, which is the positive input potential of the operational amplifier 37, is at the ground potential between time _t1 and _t2 , and
Since the operational amplifier 22 is at a high level between t ₂ and _{t 3} , the capacitor 36 is charged and gradually raised to the voltage divided by the resistors 30 and 31 . On the other hand, the potential at point _B , which is the negative input potential of the operational amplifier 37, is at the divided potential of the power supply voltage by the resistor 32 and the resistor 33 between time t ₁ and t ₂ , and is approximately at the potential of the operational amplifier between time t ₂ and _{t 3} It is at a high level of 22. B ₂ between time t ₁ and t ₃
Since the point potential is set higher than the _A2 point potential, the output of the operational amplifier 37 is at a low level between times _t1 and _t3 . At time _t3 , the output of the operational amplifier 22 is inverted to a low level, so the potential at point _B immediately drops from the high level to the divided voltage of the power supply voltage by resistor 32 and resistor 33, and becomes lower than the potential at point _A , so the calculation The output of amplifier 37 is inverted from low level to high level. This means that the second timer 27 starts, and by starting the second timer 27, the transistor 38, which is the second switching means, is turned on, and the excitation coil 3a is again excited, and the raising relay is activated. 3 to switch the movable contact piece 3c to the power supply side fixed contact 3e side. Therefore motor 1
1 rotates forward again and the window glass begins to rise again. At time _t3 , the transistor 23, which is the first switch means, is turned off, but the transistor 38, which is the second switch means, is turned on, so that the transistor 7, which is the third switch means, maintains the off state. Then, the charge on the capacitor 36 is transferred to the resistor 3.
1, the potential at the point _A2 begins to fall, and at time _t4, it finally falls below the potential at the point _B2 , and the output of the operational amplifier 37 is inverted from a high level to a low level. This means that the second timer 27 has expired and the transistor 38 is turned off. By setting the time period between time t ₃ and _{time t 4} to be slightly longer than the time required for the window glass that has once lowered to rise again and reach the upper limit of the window frame, from time t ₃ to time
Between t _{and 4} , the window glass reaches the upper limit of the window frame and the motor 11
is locked, so the upward overload detection switch 5 is opened. After time _t3 , the operational amplifier 22 is at a low level, the transistor 23 is not turned on, and the excitation coil 4a is not excited. At time _t4 , the transistor 38 is turned off, so the excitation coil 3a is demagnetized, and the movable contact piece 3c becomes the ground-side fixed contact 3.
The power is restored to the d side and the power supply to the motor 11 is cut off. Since the time from when the motor 11 reaches the upper limit of the window frame and is locked until the power supply is cut off is short, there is no risk of the motor 11 being burnt out. The time limit between times _t3 and _t4 can be controlled by setting the discharge time constant of the capacitor 36 to an appropriate value.

In addition, the amount of descent of the window glass determined by the time limit between time t ₂ and time _{t 3} is determined by the amount of descent required to obtain the time necessary to remove a foreign object such as a human body caught between the window glass and the window frame, and to facilitate the removal. Usually, this amount of drop is
It is approximately 10 to 15 cm, and in order to obtain this amount of fall, the discharge time constant of the capacitor 21 may be set to an appropriate value to determine the time limit between times _t2 and _t3 .

The diode 43 is provided to prevent the excitation coil 3a from being excited when the transistor 23 turns on at time _t2 and excites the excitation coil 4a.
Diode 42 is connected to transistor 3 at time _t3 .
8 is turned on to excite the excitation coil 3a, the excitation coil 4a is not excited.

Under normal conditions, when a foreign object such as a human body is not caught between the window glass and the window frame when the window glass is rising, the motor 11 is locked when the window glass reaches the upper limit of the window frame, so that the rising side is not exceeded. The load detection switch 5 is opened, and the motor 11 is activated at time t ₂ in the same way as when a human body or the like is caught between the window glass and the window frame.
After lowering the window glass by an amount determined by the time limit between _t3 and t3, the window glass is automatically raised again until it reaches the upper limit of the window frame within the time limit between time _t3 and _t4 . When the second timer 27 expires, the excitation coil 3a is demagnetized and the power supply to the motor 11 is cut off.

Next, the case of lowering the window glass will be explained. When the movable contact piece 2a of the one-touch operation switch 2 is inserted into the lowering fixed contact 2c side, the excitation coil 4a of the lowering relay 4 is energized, and the transistor 7 is turned on by closing the normally open self-holding contact 4b, and the operation switch 2 is turned on. Even if the lowering relay 4 is released, the lowering relay 4 is self-held. Therefore, the movable contact piece 4c of the lowering relay 4 switches to the power supply side fixed contact 4e side, and the motor 11 has the battery 1, the power supply side fixed contact 4e, the movable contact piece 4c, the motor 11, the movable contact piece 3c, and the ground side fixed The window glass is rotated by the circuit connected to the contact point 3d and ground, and the window glass is lowered. When the window glass reaches its lower limit and becomes fully open, the motor 11 is locked, so the descending side overload detection switch 6 is opened, the transistor 7 is turned off, the excitation coil 4a is demagnetized, and the movable contact piece 4c becomes the ground side fixed contact. Since the power is restored to the 4d side and the power supply to the motor 11 is cut off, there is no risk of burning out the motor 11.

As described above, in the present invention, when the reversible motor is overloaded when the window glass is raised, the upward side overload detection switch is opened to lower the window glass by a predetermined amount, and then the window glass is automatically lowered. When the window glass is raised again and the window glass is fully closed, the power supply to the reversible motor is automatically cut off. Even when a load is applied, foreign matter can be immediately removed, ensuring safety, and there is no need to turn on the operating switch again, resulting in very good operability.

In addition, it is necessary to install wiring on the window side, and there is no need for a lower limit switch or a detection means for detecting that a foreign object such as a part of the human body is caught between the window glass and the window frame. This simplifies the wiring and reduces the number of installation steps.

[Brief explanation of the drawing]

The figures show an embodiment of the automobile window glass electric drive device of the present invention, in which Fig. 1 is a circuit diagram and Fig. 2 is a
This is a time chart for explaining the operation shown in the figure. 1...Power supply, 2...One-touch operation switch,
3... Relay for ascending, 4... Relay for descending, 3
a, 4a...excitation coil, 3b, 4b...self-holding contact, 3c, 4c...movable contact piece, 3f, 4f...
... Self-holding circuit, 5 ... Rising side overload detection switch, 6 ... Descending side overload detection switch, 7 ... Third switch means, 11 ... Reversible motor, 12
... first timer, 23 ... first switch means, 27 ... second timer, 38 ... second switch means.

Claims (1)

[Scope of utility model registration request] Both ends of the reversible motor are connected to the movable contacts of the ascending and descending relays that switch between one and the other of the power supply, and each self-holding motor is connected in series with the excitation coil of each of the ascending and descending relays. A self-holding circuit for the raising and lowering relays is created by connecting the contacts and the overload detection switches for the raising and lowering sides, which open when the motor is overloaded when the window glass is raised or lowered. form,
In the automobile window glass electric drive device, which controls the operation of a reversible motor by exciting each of the excitation coils by switching on and turning on a one-touch operation switch, a first timer is started when the upward side overload detection switch is opened; , a first switch means that closes when the first timer starts and excites the excitation coil of the lowering relay;
a second timer that starts when the timer ends, a second switch means that closes when the second timer starts and energizes the excitation coil of the rising relay; and a second switch means that is connected to the respective self-holding circuits. and a third switch means that opens when the first switch means or the second switch means is in the closed state.