JPH0734121Y2 - Control device for power window regulator - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial field of application) The present invention relates to a control device for a power window regulator in which a window glass is opened and closed by a motor, and more particularly, to an automatic reset operation switch. The present invention relates to a control device for a power window regulator having a function of automatically moving a window glass to a closed position or an open position after the provided auto mode contact is once turned on even after the on operation is released.

(Prior Art) For example, in a control device of a power window regulator for vertically moving a window glass for a driver's side door of an automobile, there are first and second manual mode contacts and first and second automatic mode contacts. An automatic return type operation switch with mode contact, moves the window glass upward (close direction) in response to forward power supply, and moves the window glass downward (open direction) in response to reverse power supply. And a motor, and is generally configured as follows. That is, the energization of the motor is controlled by a relay, and when each manual mode contact is turned on, the relay is operated to form a forward or reverse energization path of the motor. It has become. As a result, in the state where each manual mode contact is turned on, the window glass is moved up and down only during the on period, which allows the window glass to be moved to an arbitrary position. Further, when the relay is operated by turning on each auto mode contact, the operating state (that is, the state in which the motor forward or reverse direction energization path is formed) is held even after the auto mode contact is turned off. In addition to providing a circuit, an automatic stop circuit is provided to detect a lock current flowing when the motor is energized in accordance with such a holding state and detect the lock current to release the holding of the relay operating state by the holding circuit. There is. As a result, once the first or second auto mode contact is turned on by one-touch operation, the holding circuit keeps the relay in the operating state even after the contact is turned off, so that the motor continues to be energized. The window glass is moved upward or downward. And
When such movement causes the window glass to reach the fully closed position or the fully opened position, the relay operating state is released by the auto-stop circuit that detects the lock current of the motor accompanying this, and the window glass is thus fully closed. Alternatively, energization of the motor is automatically stopped when the motor is moved to the fully open position.

(Problems to be solved by the invention) When the lock current once starts to flow in the motor, the lock current decreases as the winding temperature rises.
In some cases, it may fall below the threshold level set for the lock current detection in the auto stop circuit. In such a case, the holding state by the holding circuit will not be released forever, so the power supply to the motor will be inadvertently continued, the motor will overheat, or the on-board battery that is the power supply will This leads to an increase in the consumption of electricity.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to reliably prevent a situation where a locked state of a motor for moving a window glass is inadvertently continued for a long time. Also, the initialization of the timer circuit required to obtain such a prevention function can be performed with a simple configuration, and there is no fear that the existence of the timer circuit adversely affects the movement control of the windshield, etc. (EN) Provided is a control device of a power window regulator which exerts the effect of.

[Means for Solving the Problems] (Means for Solving the Problem) In order to achieve the above-mentioned object, the present invention moves the window glass in the closing direction in response to forward energization and opens the window glass in response to reverse energization. A motor for moving in the direction, the window glass is moved in the closing direction or the opening direction by the motor only during the ON period of the first or second manual mode contact of the automatic return type operation switch, and the operation is performed. A control device for a power window regulator having a structure in which a window glass is automatically moved to a closed position or an open position by a motor when a first or second auto mode contact of a switch is once turned on. The forward direction energization path of the motor is formed in each ON state of the manual mode contact and the first auto mode contact. A switching circuit that forms a reverse-direction energization path of the motor in each of the ON states of the second manual mode contact and the second auto mode contact, and either the first or second auto mode contact is turned on. A timer circuit for performing a timer operation for a predetermined time and holding the energization path formation state of the switching circuit when the contact is turned on only during the timer operation period,
A current detection circuit for detecting a load current flowing in the motor,
A first cancel circuit that initializes the timer circuit when the current detected by the current detection circuit exceeds an upper limit value, and the timer when the current detected by the current detection circuit falls below a predetermined limit level. A second cancel circuit for initializing the circuit is provided.

(Operation) The switching circuit forms the forward direction energization path of the motor when the first manual mode contact is on to move the window glass in the closing direction, and reverses the motor when the second manual mode contact is on. An electric path is formed to move the window glass in the opening direction. Therefore, the window glass can be moved to an arbitrary position according to the turning on of each of the manual mode contacts.

On the other hand, the switching circuit forms the forward direction conduction path and the reverse direction conduction path of the motor, respectively, even when the first and second auto mode contacts are in the ON state. Further, when either of the first and second auto mode contacts is turned on,
The timer circuit performs a timer operation for a predetermined time, and holds the energization path formation state of the switching circuit as described above only during the timer operation period. Therefore, when the first and second auto mode contacts are turned on, the formation state of the motor forward or reverse energization path is maintained even after the contacts are turned off, whereby the window glass is closed or opened. Is automatically moved to. When the window glass is moved to the fully closed position or the fully open position by such movement, the motor is locked and a large load current flows, and the current detected by the current detection circuit becomes the upper limit value or more. Then, the first cancel circuit initializes the timer circuit, so that the timer circuit releases the energization path formation state by the switching circuit. That is, when the first or second auto mode contact is turned on, the motor is automatically cut off when the window glass is moved to the fully closed position or the fully open position. Be done.

Then, when the lock current once starts to flow in the motor, the lock current decreases as the winding temperature rises, and thus the automatic disconnection operation by the first cancel circuit as described above is not performed. In this case, when the timer operation of the timer circuit is finished thereafter, the energization path formation state of the motor by the switching circuit is released, so that there is no possibility that the motor is inadvertently energized for a long time.

Also, if it is necessary to cancel the operation while the auto mode operation as described above is being performed, turn on the manual mode contact set in the direction opposite to the actual movement direction of the windshield. Let That is, when the window glass is moved in the closing direction, the second manual mode contact for moving the window glass in the opening direction is turned on, and when the window glass is moved in the opening direction, the window glass is closed. The first manual mode contact for moving in the direction is turned on. Then, at such an on-time, the switching circuit is switched to a state in which the forward direction energization path and the reverse direction energization path of the motor are simultaneously formed, that is, the state in which the current is not supplied to the motor. It is below the limit level. As a result, the second cancel circuit comes to initialize the timer circuit, and accordingly, the auto mode operation is canceled.

(Embodiment) An embodiment in which the present invention is applied to an automobile power window regulator will be described below with reference to the drawings.

In the figure, 1 is an automatic return type operation switch provided on the driver's seat side of an automobile, which includes an operation knob (not shown) which can be rotated in the front-rear direction from a neutral position, and a common contact C. , The first and second manual mode contacts M1 and
It has M2 and first and second auto mode contacts A1 and A2. This operation switch 1 is in the off state when the operation knob is in the neutral position (non-operation state), but when the operation knob is rotated forward by a predetermined amount, the movable contact C is set to the first manual mode. The contact M1 is brought into contact with it to turn it on, and when the operation knob is further rotated forward from this state, the movable contact C is brought into contact with the first auto mode contact A1 and turned on at the same time. Is configured to perform a two-step operation. Further, the operation switch 1 brings the movable contact C into contact with the second manual mode contact M2 to turn it on when the operation knob is rotated backward from the neutral position by a predetermined amount, and is operated from this state. When the knob is further rotated in the rearward direction, the movable contact C is brought into contact with the second auto mode contact A2 and is also turned on at the same time, thereby performing a two-step operation. Incidentally, the switch device 1 is provided with a well-known moderation mechanism so that a feeling of moderation is given to the operation knob during the two-step operation as described above.

At this time, in the operation switch 1, the movable contact C is connected to the DC power supply terminal 2 having a positive potential, and the first and second manual mode contacts M1 and M2 are connected to the lines 3 and 4, respectively. Further, the first and second auto mode contacts A1 and A2 are commonly connected to the line 5. Although not shown, the DC power supply terminal 2 is connected to a vehicle-mounted battery via an ignition switch.

Reference numeral 6 denotes a DC motor for driving a window regulator, which moves a window glass for a driver side door (not shown) upward (closed direction) when energized in the forward direction (arrow E direction in the figure). When the windshield glass is energized in the opposite direction (counter arrow E direction), the window glass is moved downward (opening direction). In such a motor 6, one terminal thereof is connected to the common contact c of the relay switch 7a and the other terminal thereof is connected to the common contact c of the relay switch 8a. In the relay switches 7a and 8a, each normally open contact a is connected to the DC power supply terminal 2, and each normally closed contact b is connected to the ground terminal via the shunt resistor 9 which is a current detection circuit. There is.

The exciting coil 7b of the relay switch 7a has one end connected to the line 3 via a diode 10 having the illustrated polarity and the other end connected to a ground terminal via an npn-type transistor 11. The exciting coil 8b of the relay switch 8a has one end connected to the line 4 via a diode 12 having the illustrated polarity and the other end connected to an npn-type transistor 1b.
Connected to the ground terminal through 3. Then,
The transistors 11 and 13 are relay switches 7a and 8a.
And the exciting coils 7b, 8b, etc. constitute the switching circuit 14, and the base of one transistor 11 is
The transistor 15 is connected to the line 3 via the diode 15 and the resistor 16 having the polarities shown in the drawing, and the base of the other transistor 13 is connected to the line 4 via the diode 17 and the resistor 18 having the polarities shown in the drawing. The common contact c of the relay switch 7a and the exciting coil
7b, and between the common contact c of the relay switch 8a and the exciting coil 8b, the diode 19 or 20 of the polarity shown in the figure.
Connected through.

Reference numeral 21 is a timer circuit, which has the following configuration. That is, the timer circuit 21 uses the capacitor 22 as a time element, and the capacitor 22 has one end connected to the output extraction point P and the other end connected to the ground terminal. In this case, the output extraction point P is
It is connected to the line 5 via 23, and is also connected to the bases of the transistors 11 and 13 via a resistor 24 and a diode 25 or 26 having the polarity shown in the drawing. Note that this timer circuit 21 charges the charge of the capacitor 22 to the transistor 11
The timer operation is performed by discharging as the base current of.

On the other hand, the shunt resistor 9 outputs the detection voltage Vd at a level proportional to the load current flowing in the motor 6 from one end (a terminal on the side opposite to the ground terminal) of the shunt resistor 9. The signal is supplied to the inverting input terminal (-) of the comparator 27 and the non-inverting input terminal (+) of the second comparator 28.

The first comparator 27 includes a first cancel circuit 29.
The output terminal of the open collector type is connected to the signal output point P via the resistor 30. In the first cancel circuit 29,
Reference numeral 31 is a reference voltage generating circuit for generating a reference voltage Vs1 to be given to the non-inverting input terminal (+) of the first comparator 27, which is connected in series with resistors 31a and 31b between the constant voltage power supply terminal + Vcc and the ground terminal. It will be done. In this case, the reference voltage Vs1 is set to be equal to the detection voltage Vd output from one end of the shunt resistor 9 when an upper limit current corresponding to the lock current of the motor 6 flows through the shunt resistor 9. . Therefore, in the first comparator 27,
When the load current flowing through the motor 6 is equal to or higher than the lock current (when Vd ≧ Vs1), the output terminal is connected to the ground terminal.

The second comparator 28 includes a second cancel circuit 32.
The output terminal of the open collector type is connected to the signal output point P via the resistor 33. In the second cancel circuit 32,
Reference numeral 34 is a reference voltage generation circuit for generating a reference voltage Vs2 to be given to the inverting input terminal (-) of the second comparator 28,
This is a resistor 3 between the constant voltage power supply terminal + Vcc and the ground terminal.
4a and 34b are connected in series. In this case, the reference voltage Vs
2 is set to a predetermined limit level which is low to zero level. Therefore, in the first comparator 28, when the load current flowing through the motor 6 falls below the limit level close to zero level (when Vd <Vs2), the output terminal is connected to the ground terminal. Present.

Next, the operation of the above configuration will be described. Now, when the first manual mode contact M1 of the operation switch 1 is turned on, the base bias voltage is supplied to the transistor 11. Therefore, the transistor 11 is turned on and the exciting coil 7b is energized, and accordingly, the relay switch 7a is turned on between the contacts (ca). As a result, the switching circuit 14 forms a positive direction (arrow E direction) energization path of the motor 6 via the shunt resistor 9, and a window glass (not shown) is moved upward as a closing direction. From this state, when the first manual mode contact M1 is turned off, the transistor 11 is turned off and the relay switch 7a is turned into a contact (c-b).
Since it is returned to the ON state for a while, the motor 6 is cut off and the movement of the windshield is stopped. Also, the operation switch 1
When the second manual mode contact M2 is turned on, the relay switch 8a is turned on between the contacts (ca) by energizing the exciting coil 8b according to the turning on of the transistor 13. Therefore, the switching circuit 14
However, the current path of the motor 6 in the opposite direction (counter arrow E direction) is formed via the shunt resistor 9, and the window glass is moved downward as an opening direction. When the second manual mode contact M2 is turned off from this state, the transistor 11 is turned off to return the race switch 8a to the on state between the contacts (c-b), so that the motor 6 is cut off and the windshield moves. Is stopped. Therefore,
By appropriately turning on the manual mode contacts M1 and M2, the window glass can be moved to any position.

On the other hand, the first auto mode contact in the operation switch 1
When A1 is turned on, a transistor
11 is turned on to form the forward direction conduction path of the motor 6 in the same manner as described above, and the capacitor 22 is charged through the resistor 23, so that the potential at the output extraction point P rises. Therefore, the upward movement of the window glass is started, and the base current is supplied to the base of the transistor 11 from the output extraction point P via the supply 24 and the diode 25. As a result, the timer operation of the timer circuit 21 is started, and at the same time, the forward direction conduction path formation state of the motor 6 by the switching circuit 14 is held. Therefore, even if the first auto mode contact A1 is turned off thereafter, the upward movement of the windshield is automatically continued. When the window glass is moved to the fully closed position by such movement, the motor 6 is locked and a large load current flows, causing the shunt resistor 9 to move.
The detection voltage Vd from Vs1 becomes equal to or higher than the reference voltage Vs1 set in the first cancel circuit 29. Then, the first comparator 27 has a state in which its output terminal is connected to the ground terminal, so that the charge charged in the capacitor 22 is discharged through the resistor 30, and accordingly, the timer circuit 21 is initialized and the transistor 11 is reset. Is turned off, the above-described energized path formation state by the switching circuit 14 is released. That is, the motor 6 is automatically disconnected when the windshield is moved to the fully closed position.

Here, when the lock current once begins to flow in the motor 6 as described above, the lock current decreases as the winding temperature of the motor 6 rises, and in some cases the timer circuit by the first cancel circuit 29. 21 Initialization operation may not be performed. However, in this case, when the timer operation of the timer circuit 21 ends due to the progress of the discharge of the capacitor 22, the transistor 11 is turned off and the energization path formation state of the motor 6 by the switching circuit 14 is released. On the other hand, there is no risk of inadvertently energizing for a long time.

Then, in the middle of the automatic mode operation in which the window glass is automatically moved upward in response to the turning on of the first automatic mode contact A1 described above, it is necessary to cancel the operation. In this case, the second manual mode contact M2 is turned on. Then, the base bias voltage is applied to the transistor 13 and turned on, so that the exciting coil 8b is energized and the relay switch 8a is turned on between the contacts (ca). As a result,
Both ends of the motor 6 are contact points of the relay switches 7a and 8a (c-
Since a short circuit occurs between a), the motor 6 is braked and the load current flowing through the shunt resistor 9 becomes zero. Therefore, the detection voltage Vd from the shunt resistor 9 also becomes zero level, and the second comparator 28 in the second cancel circuit 32 exhibits a state in which its output terminal is connected to the ground terminal, so that the capacitor 22 is charged. Charge is resistance 33
Be discharged through. Therefore, since the timer circuit 21 is initialized and the transistor 11 is turned off, the above-mentioned energization path forming state by the switching circuit 14 is released, and the above-mentioned auto mode operation is canceled.

The operation when the second auto mode contact A2 is turned on is the same as that described above, and the auto mode operation (the operation in which the window glass is automatically moved to the fully open position) performed by such turning on is performed. The cancellation of () is also performed in the same manner as described above in response to the turning on of the first manual mode contact M1, and therefore the description thereof is omitted.

In short, according to the above-described embodiment, the lock current of the motor 6 when the window glass is moved to the fully closed position or the fully opened position is detected during the automatic mode operation of the window glass, and Even if the function of disconnecting the motor 6 based on the detection result is impaired, the motor 6 can be disconnected by the timer circuit 21 after the elapse of a predetermined time. There is no possibility of continuing. Also,
As the timer circuit 21, it is sufficient to use a simple configuration using the capacitor 22, but when the capacitor 22 is used in this way, the timer circuit 21
Can be easily initialized by discharging the capacitor 22, which is advantageous in terms of circuit configuration. Particularly, in the present embodiment, while the auto mode operation is being performed,
When the operation is released, the capacitor 22 is turned on in response to the turning on of the first or second manual mode contact M2 or M1 which is set in the direction opposite to the actual moving direction (upward or downward) of the window glass. The timer circuit 21
Since it is a configuration for initializing the above, there is no fear that the switching system of the moving state of the window glass is complicated due to the provision of the timer circuit 21.

[Effects of the Invention] According to the present invention, as is clear from the above description, when the motor for moving the window glass is in the locked state, it is possible to reliably prevent the locked state from being inadvertently continued for a long time. In addition, the initialization of the timer circuit necessary for obtaining such a prevention function can be performed with a simple configuration, and the existence of the timer circuit adversely affects the movement control of the window glass. Is something that disappears.

[Brief description of drawings]

The drawing is a circuit diagram showing an embodiment of the present invention. In the figure, 1 is an operation switch, M1 is a first manual mode contact, M2 is a second manual mode contact, A1 is a first auto mode contact, A2 is a second auto mode contact, 6 is a motor, 7a, 8a is a relay contact, 9 is a shunt resistor (current detection circuit), 14 is a switching circuit, 21 is a timer circuit, 22
Is a capacitor, 27 is a first comparator, 28 is a second comparator, 29 is a first cancel circuit, and 32 is a second cancel circuit.

Claims (1)

[Scope of utility model registration request] 1. An automatic reset type operation switch having first and second manual mode contacts and first and second auto mode contacts, and a window glass is moved in a closing direction in response to forward direction energization. A motor that moves the window glass in the opening direction in response to reverse energization, and moves the window glass in the closing direction or the opening direction by the motor only during the ON period of the first or second manual mode contact. In addition, when the first or second auto mode contact is once turned on, the control device for the power window regulator is configured to automatically move the window glass to the fully closed position or the fully opened position by the motor. The forward direction energization path of the motor is formed in each ON state of the first manual mode contact and the first auto mode contact. A switching circuit for forming a backward current path of the motor at each on-state of the second manual mode contact and the second automatic mode contact with,
When any one of the first and second auto mode contacts is turned on, a timer operation for a predetermined time is performed, and the energized path forming state of the switching circuit is held with the contact being turned on only during the timer operation period. A timer circuit, a current detection circuit for detecting a load current flowing in the motor,
A first cancel circuit that initializes the timer circuit when the current detected by the current detection circuit exceeds an upper limit value, and the timer when the current detected by the current detection circuit falls below a predetermined limit level. A control device for a power window regulator, comprising a second cancel circuit for initializing the circuit.