JPH0455583A - Controller for power window regulator - Google Patents

Abstract

PURPOSE:To raise the reliability of control by a method in which two relays for power supply to normal and reverse directions of motor are directly controlled by separating unrelated side from power source for auto mode. CONSTITUTION:The first and second relays 9 and 10 for forming normal and reverse electrifying paths of a motor 8 are provided. The first and second semiconductor switching elements 48 and 49 forming electrifying paths to the relay coils 9b and 10b of the relays 9 and 10 are also provided. During operation for manual mode, the motor 8 is turned normal or reversely through the elements 48 and 49. Also, during operation for auto mode, unrelated one of the elements 48 and 49 is separated from power source by operating an auto made switch 4, whereby obviating the occurrence of maloperation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) 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.

(Prior Art) A control device for a power window regulator provided on the driver's side door of an automobile is generally set to an auto mode in addition to a normal manual mode. In this case, the power supply and disconnection of the motor for moving the windshield up and down is carried out by a relay, and the operation of the relay is controlled by an external operation switch in order to facilitate control in auto mode. The configuration is such that this is done through a semiconductor switching element that is turned on and off according to the operation.

In other words, when operating in manual mode, the relay is operated through the semiconductor switching element only during the period of external operation of the operation switch, thereby forming an energizing path for the motor and moving the window glass in the closing direction or opening direction. It has become.

In addition, when operating in the auto mode, the ON state of the semiconductor switching element is maintained by a flip-flop circuit including the semiconductor switching element, and the held state is maintained when the windshield is in the fully closed or fully open position. The configuration is such that it is released when the limit is reached.

(Problems to be Solved by the Invention) In the conventional power window regulator control device described above, when operating in manual mode, the operation of the relay is controlled through a semiconductor switching element that is turned on and off by operating the operation switch. Since the operating system between the relays and the relays has an additional semiconductor switching element, there is a problem in that the reliability of the control is low.

In addition, in conventional devices, the semiconductor switching element and the relay coil are connected in series with the power supply, so even when the operation switch is in the OFF state, the semiconductor switching element and the relay coil are connected in series. The power supply voltage is applied through. However, in such a situation, if noise is superimposed on the power supply line or the signal line for on/off control of the semiconductor switching element, there is a risk that the semiconductor switching element will malfunction, and this problem remains unresolved. This had become an issue. especially,
If a malfunction of the semiconductor switching element as described above occurs while the windshield is being moved in auto mode, the flip-flop circuit that includes the semiconductor switching element is reversed to change the direction of movement of the windshield. There was a problem in that the control reliability could be changed inadvertently in the opposite direction, further reducing control reliability in auto mode.

The present invention has been made in view of the above circumstances, and its purpose is to improve control reliability when the windshield is moved in manual mode, and to improve control elements when the windshield is moved in auto mode. An object of the present invention is to provide a power window regulator control device which is configured to utilize a semiconductor switching element, but can prevent malfunctions of the switching element and improve control reliability in auto mode.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides a power supply including a motor that moves a windshield in a closing direction and an opening direction in response to forward and reverse energization. In a control device for a window regulator, first and second manual mode switches are selectively turned on by external operation, and automatic mode switches are turned on together with either the first or second manual mode switch according to external operation. A mode switch is provided, and the relay coil is energized from the power source via the first manual mode switch, and the windshield moving motor is operated in the forward direction via a normally open contact that is turned on when the relay coil is energized. A first relay forming an electric path has a relay coil that is energized from the power supply through the second manual mode switch, and a reverse direction energization path of the motor is established through a normally open contact that is turned on in the energized state. second to form
a first semiconductor switching element that forms a current-carrying path to the relay coil of the first relay via a normally open contact of the relay when the auto mode switch is turned on together with a first manual mode switch;
a second semiconductor switching element that forms an energizing path to the relay coil of the second relay via a normally open contact of the relay when the auto mode switch is turned on together with the second manual mode switch; and a holding circuit that maintains the on state of the second semiconductor switching element for a period of time until the window glass reaches the fully closed position or the fully open position (Function) The first manual mode switch is turned on. When operated,
The relay coil of the first relay is connected to the first relay coil from the power supply.
The motor becomes energized via the manual mode switch, and in response, the first relay forms a positive direction energization path for the motor. Then, the window glass is moved in the closing direction in response to the positive energization of the motor. Furthermore, when the second manual mode switch is turned on, the relay coil of the second relay is energized from the power source via the second manual mode switch, and accordingly, the second manual mode switch is turned on. The relay now forms a reverse energization path for the motor. Then, the window glass is moved in the opening direction in response to the reverse direction energization of the motor.

In this case, the relay coils of the first and second relays are energized directly via the first and second manual mode switches, respectively.
There is no risk of deterioration in control reliability as in the conventional configuration in which a semiconductor switching element is interposed.

On the other hand, when the auto mode switch is turned on together with the first manual mode switch, when the manual mode switch is turned on, the relay coil of the first relay is energized in the same way as described above, forming a forward current conduction path for the motor. . At the same time, a current-carrying path to the relay coil of the first relay is formed via the first semiconductor switching element and the normally open contact of the first relay, and such a state occurs when the auto mode switch And even after the first manual mode switch is turned off, it is held by the holding circuit. As a result, the window glass continues to move in the closing direction, and when the window glass reaches the fully open position, the holding state by the holding circuit is released and the first semiconductor switching element is turned off.
Power to the motor will be automatically cut off.

In this case, the energization path for the relay coil of the second relay that forms the reverse energization path of the motor is configured to be formed via the normally open contact of the relay and the second semiconductor switching element. At this time, the relay coil is in a power-off state and its normally open contact is turned off, so the second semiconductor switching element is disconnected from the power supply. Therefore, even while the window glass is being moved in the closing direction in the auto mode, the power supply voltage is not applied to the second semiconductor switching element, and the second semiconductor switching element malfunctions due to noise, causing the window to close. There is no possibility that the direction of movement of the glass will change inadvertently.

When the auto mode switch is turned on together with the second manual mode switch, turning on the manual mode switch energizes the relay coil of the second relay, forming a reverse energization path for the motor, as described above. Also, at the same time, a current-carrying path to the relay coil of the second relay is formed via the second semiconductor switching element and the normally open contact of the second relay,
Such a state is maintained by the holding circuit even after the auto mode switch and the second manual mode switch are turned off. As a result, the window glass continues to move in the opening direction, and when the window glass reaches the fully open position, the holding state by the holding circuit is released and the second semiconductor switching element is turned off, so that the motor is no longer energized. will be automatically cut off.

In this case, the energization path for the relay coil of the first relay that forms the forward energization path of the motor is configured to be formed via the normally open contact of the relay and the first semiconductor switching element. At this time, the relay coil is in a power-off state and its normally open contact is turned off, so the first semiconductor switching element is disconnected from the power source. Therefore, even while the window glass is being moved in the opening direction in auto mode, the power supply voltage is not applied to the first semiconductor switching element, and the first semiconductor switching element malfunctions due to noise and the window is opened. There is no possibility that the moving direction of the glass will change inadvertently.

(Example) Hereinafter, an example in which the present invention is applied to a power window regulator for a driver's seat of an automobile will be described with reference to the drawings.

In FIG. 1, a power window switch 1 that can be operated from the driver's seat of an automobile includes an operation knob (not shown) that can be operated, for example, in the front-rear direction from a neutral position, as well as a first manual mode switch. Manual up switch 2. It comprises a manual down switch 3 and an auto mode switch 4 as a second manual mode switch. Each of these switches 2 to 4 is configured to be of an automatic return type, and each switch 2 to 4 is turned off when the operating knob is in a neutral position, that is, in a non-operated state. When the operating knob is operated forward by a predetermined amount from this non-operating state, the manual up switch 2 is turned on, and
When the operation knob is operated backward by a predetermined amount, the manual down switch 3 is turned on. When the operating knob is further operated in the forward or backward direction from the ON state of each of the switches 2 and 3, the auto mode switch 4 is also turned ON.

Each of the switches 2 to 4 has one end connected to a DC power supply terminal 5 serving as a power source via a diode 6 with the polarity shown, and the other end connected to a terminal Ta of a control circuit 7, which will be described later.
Connected to Tb and Tc. Although not shown, the DC power supply terminal 5 is connected to an on-vehicle battery (output voltage 12V) via an ignition switch.

When the DC motor 8 for driving the window regulator is energized in the forward direction (in the direction of arrow UP in the figure), it moves the window glass for the driver's side door (not shown) upward (in the closing direction), and also in the reverse direction (in the direction of closing). When energized in the direction of the arrow DOWN, the window glass is moved downward (opening direction).
It is configured to move to.

The first and second relays 9 and 10 are unitized, and each common contact C of the relay switches 9a and 10a is
It is connected to both ends of the motor 8, and is also connected to terminals Td and Te of the control circuit 7 via diodes lla and llb in the forward direction, respectively. Furthermore, in the relay switches 9a and 10a, each normally open contact a is connected to the DC power supply terminal 5, and each normally closed contact is grounded via a current detection resistor 12 for detecting the current flowing to the motor 8. connected to the terminal. The relay coil 9b of the first relay 9 is connected to be energized from the DC power terminal 5 via the diode 6 and the manual up switch 2, and the relay coil 10b of the second relay 10 is connected to
It is connected to be energized from a DC power supply terminal 5 via a diode 6 and a manual down switch 3.

Here, a cutoff voltage Vd of a level corresponding to the load current flowing to the motor 8 appears at the terminal of the current detection resistor 12 on the relay 9° 10 side, and this cutoff voltage Vd is applied to the control circuit 7 is applied to the terminal Tf of.

The control circuit 7 is composed of, for example, a hybrid IC, and has terminals Tg-Tj in addition to the above-mentioned terminals Ta-Tf.
has. At this time, the terminal Tg is connected to the ground terminal, and the terminal Th is connected to the ground terminal via a resistor 13 for generating a first reference voltage V s 1, which will be described later. Further, the terminal Ti is connected to the ground terminal via a constant voltage diode 14 (Zener voltage of about 8 V) having the illustrated polarity, and the terminal Tj is connected to the ground terminal via a capacitor 15 which is a timer element in series. Furthermore, this capacitor 15
Since a relatively large capacitance is required, for example, an electrolytic capacitor is used.

Therefore, the specific configuration of the control circuit 7 will be explained below.

That is, one end of the bus line La is connected to the terminal Td through the resistor 16 and then through diodes 17a and 17b of the polarity shown.
, Te, respectively, and the other end is connected to the terminal Ti, and the auxiliary bus line Lb is connected to the terminal Tg (that is, the ground terminal).

Terminal Tc corresponding to auto mode switch 4 is connected to resistor 1
89 is connected to the auxiliary bus line Lb via the diode 19 with the polarity shown and the discharge resistor 20, and the capacitor 15
The terminal Tj to which is connected is a diode 19 and a resistor 20
connected to a common connection point. In this case, the discharge time constant of the capacitor 15 via the resistor 20 is set to, for example, about 100 seconds. Note that the resistor 18. diode 1
The charging time constant of the capacitor 15 via the capacitor 9 is, for example, 0°0.
It is set to about 11 seconds.

On the other hand, the auxiliary reference voltage generation circuit 2
2, and an auxiliary reference voltage V s 1 is output from the common connection point of the resistors 13 and 21.

The first comparator circuit 23 is provided so as to be supplied with power through the bus line La and the auxiliary bus line Lb, and together with the current detection resistor 12 and the auxiliary reference voltage generation circuit 22, it is connected to a well-known auto-stop circuit in a power window regulator. It consists of In this case, the first comparison circuit 23 is connected to compare the auxiliary reference voltage vS1 applied through the resistor 24 with the cutoff voltage Vd applied from the terminal Tf through the resistor 25.

Further, the first comparator circuit 23 is of an open collector output type, and when the relationship Vsl>Vd, it exhibits an off state with a large output resistance (a state in which the internal output stage transistor is turned off), but Vsl≦Vd When the relationship is as follows, the output resistance is inverted to the on state (the output stage transistor is on) with a small output resistance. Note that noise prevention capacitors 26 to 29 are connected to the first comparison circuit 23 between each of the input and output terminals and between the power supply terminals.

The output terminal of the first comparison circuit 23 is connected to the terminal Tj through a resistor 30. Voltage Vzd-5 to 6V) is connected with the illustrated polarity.

As a result of this connection, the resistors 30 and 31 have the first
The discharge current from the capacitor 15 flows when the comparator circuit 23 of The time τ0 required for the voltage at the common connection point of 0.31, that is, the detection voltage Vp, to drop to the level of a reference voltage V s 2, which will be described later, is set to about 0.7 seconds.

In this case, the resistance ratio of the resistors 30.31 is, for example, 1:4.
Therefore, the above-mentioned discharge time τ
0 is substantially determined by the resistor 31. Therefore, at the start of discharge through the resistors 30 and 31 as described above, the detection voltage Vp from point P is clamped to the Zener voltage Vzd of the voltage regulator diode 32, and gradually decreases from the clamp voltage Vzd. Become.

A reference voltage generation circuit 35 consisting of a series circuit of resistors 33 and 34 is connected between the bus line La and the auxiliary bus line Lb.
The reference voltage V s is applied from the common connection point of the resistors 33 and 34.
2 is output. In this case, the reference voltage Vs2 is set lower than the Zener voltage Vzd of the voltage regulator diode 32.

The second comparator circuit 36, which is a holding circuit, is not shown, but is provided to be supplied with power through the bus line La and the auxiliary bus line Lb, and is connected to compare the reference voltage Vs2 and the detection voltage Vp. There is. In this case, the second comparator circuit 36 is also of the open collector output type similar to the first comparator circuit 23, and V s 2 < V
When the relationship is p, it is in an off state with a large output resistance, but when the relationship is VS2≧Vp, it is reversed to an on state with a small output resistance. Note that the second comparison circuit 3
A noise prevention capacitor 37 is connected between each of the input terminals of 6.

At this time, a series circuit of a resistor 38 and a diode 39 with the polarity shown is connected between the output terminal of the second comparison circuit 36 and the terminal Tj, and a series circuit of a resistor 38 and a diode 39 with the polarity shown is connected between the anode of the diode 19 and the bus line La. is connected to a diode 40 of the illustrated polarity for positive clamping. Note that when the second comparator circuit 36 is inverted to the on state while the capacitor 15 is in a charged state, the charged charge is transferred to the diode 39. The discharge occurs through the resistor 38, but the discharge time constant is 0°1.
It is set to about seconds.

The output terminal of the second comparison circuit 36 is connected to the bus line La by a resistor 41.
and an npn transistor 42
is connected to the base of the resistor 43 via a resistor 43. The collector of the transistor 42 is connected to the terminal Td via a resistor 44.45 and to the terminal Te via a resistor 46.47. Further, the emitter of the transistor 42 is connected to the auxiliary power supply line Lb.

A pnp transistor 48, which is a first semiconductor switching element, has an emitter and a collector connected to terminals Td and Ta, respectively, and a base connected to a common connection point of the resistors 44 and 45.

A pnp transistor 49, which is a second semiconductor switching element, has its emitter and collector connected to the terminals Te and Tb, respectively, and its base is connected to the common connection point of the resistors 46 and 47.

The changing circuit 50 provided in association with the reference voltage generating circuit 35 has the following configuration.

That is, a capacitor 51 is connected in parallel with the resistor 33 in the reference voltage generating circuit 35, and a series circuit of a resistor 52 and a diode 53 having the polarity shown is connected in parallel with the capacitor 51. Then, the common connection point Q of the resistor 52 and the diode 53 and the terminal Ta (transistor 48
Diodes 54a and 54 of the polarity shown are connected between the terminal Tb (collector of the transistor 49) and the terminal Tb (collector of the transistor 49).
4b is connected.

Note that between the Q point and the auxiliary bus line Lb, a diode 5 with the polarity shown is connected to protect the transistors 48 and 49.
5 is connected.

Now, the operation of the above configuration will be explained below while also referring to the second factor.

(a) When moving the windshield up and down in manual mode... To raise the windshield, turn on the manual up switch 2. Then, the relay coil 9b of the first relay 9 is energized from the DC power supply terminal 5 through the diode 6 and the manual up switch 2, so the first relay 9 operates and the relay coil 9a is turned on. The contact (c-a) is turned on.

As a result, a forward current conduction path is formed through which a current flows in the direction of the arrow UP in the motor 8, and the window glass is raised. If the manual up switch 2 is turned off when the windshield is raised like this, the relay coil 9b is cut off, so the relay switch 9a is connected to the contact point (c-b).
The motor 8 returns to the on state for a while, and the forward direction energization path of the motor 8 is cut off, and accordingly, the windshield is stopped from rising.

In addition, when lowering the windshield, if the manual down switch 3 is turned on, the relay coil 10b of the second relay 10 is energized, and the contacts (C-a) of the relay switch 10a are connected. Because it is turned on,
A reverse energization path is formed in which a current flows in the DOWN direction to the motor 8, and the window glass is lowered. When the windshield is lowered, if the manual down switch 3 is turned off, the relay coil 10b is cut off, so the relay switch 10a returns to the on state between the contacts (C and B), and the motor 8 is turned on. The reverse current path is cut off,
The lowering of the window glass is then stopped.

Note that during the manual mode operation as described above, since the capacitor 15 is in a non-charging state, the detection voltage Vp from point P and the reference voltage V from the reference voltage generation circuit 35 are different.
s 2 has a relationship of V p < V s 2 . Therefore, the second comparison circuit 36 is in an on state with a small output resistance, and the transistor 43 is kept in an off state. Therefore, the transistors 48 and 49 are not turned on at each instant when the manual up switch 2 and the manual down switch 3 are turned off.

(b) When raising the windshield in auto mode... When the manual up switch 2 is turned on and then the auto mode switch 4 is also turned on, the contact of the relay switch 9a as described in (a) ( By turning on C-a), an energizing path for the relay coil 9b and a forward energizing path for the motor 8 are formed, and accordingly, the windshield begins to rise.

In this state, the connections between the DC power supply terminal 5 and the ground terminal are between the contacts (C-a) of the relay switch 9a, the diodes lla and 17a, and the resistor 16. It comes to be connected via the bus line La and the constant voltage diode 14. Therefore, a DC constant voltage output is provided between the bus line La and the auxiliary bus line Lb (connected to the ground terminal), and the control circuit 7
power is established.

However, when the auto mode switch 4 is turned on,
As will be understood from the description below, since the first comparison circuit 23 is in the off state, the capacitor 15 is instantly charged through the resistor 18 and the diode 19 (the required charging time is about 0.011 seconds). As a result, as shown in FIG. 2, the detection voltage Vp from point P is the maximum voltage Vmax
(equivalent to the voltage obtained by dividing the power supply voltage by resistors 18 and 20). As a result, the detection voltage Vp
becomes larger than the reference voltage V s 2 from the reference voltage generation circuit 35, the second comparison circuit 36 is inverted to the OFF state, and in response, a base current is applied to the transistor 42 via the resistor 41.43. Then, the transistor 42 is turned on.

After this, when the manual up switch 2 is turned off following the auto mode switch 4, the contacts (C-a) of the relay switch 9a will not be turned off immediately, but will be turned off after a slight delay. Become. Therefore, at the moment when the manual up switch 2 is turned off, the transistor 48 is turned on because the transistor 42 is turned on. As a result, the energization path for the relay coil 9b of the first relay 9 is between the normally open side contacts (C-a) of the relay switch 9a,
It is formed through the diode lla and the transistor 48, and the on state of the transistor 48 is maintained through the second comparator circuit 36, the transistor 42, etc.

In this way, the relay coil 9b is connected by the transistor 48.
If the energizing path is maintained, even if the auto mode switch 4 and manual up switch 2 are turned off, the forward direction energizing path of the motor 8 will continue to be formed, and the The windshield will be raised automatically.

Then, as described above, when the windshield is automatically raised and reaches the maximum raised position (window fully closed position), the motor 8 is locked and a relatively large locking current flows. Depending on the current detection resistor 12
voltage drop increases. When the cutoff voltage Vd applied to the terminal Tf becomes larger than the auxiliary reference voltage V s 1 from the auxiliary reference voltage generation circuit 22 in accordance with such an increase in voltage drop, the first comparison circuit 23 is turned on. It becomes reversed.

Then, the charge in the capacitor 15 comes to be discharged through the resistor 30° 31 and the output terminal of the first comparator circuit 23, but at the start of the discharge, as shown at time to in FIG. The detection voltage Vp is clamped to the Zener voltage Vzd of the voltage regulator diode 32, and decreases from the clamp voltage Vzd at a speed corresponding to the resistance value of the resistor 30.31. Time τ after the start of such discharge.

(about 0.7 seconds), the detection voltage Vp becomes lower than the reference voltage V s 2 (time t1 in Fig. 2).
), the second comparison circuit 36 is inverted to the on state.

As a result, the base current applied to the transistor 42 through the resistors 41 and 43 is transferred to the second comparator circuit 36.
Since the transistor 42 is turned off, the transistor 48 is turned off. As a result, the relay coil 9b is de-energized and the relay switch 9a returns to the ON state between the contacts (c and b), thereby cutting off the forward current conduction path of the motor 8, and the windshield stops at the maximum raised position. be done. still,
As described above, as the charge in the capacitor 19 is discharged over a period of time τ0, only the so-called retightening of the window glass is performed during this time. Further, when the transistor 48 is turned off as described above, the surge voltage generated in the relay coil 9b is absorbed through the diodes 55 and 54a, thereby protecting the transistor 48.

Here, if a lock current flows through the motor 8, the lock current may decrease due to an increase in the winding temperature. Therefore, when the motor 8 is driven in auto mode as described above, In some cases, the cutoff voltage Vd does not exceed the auxiliary reference voltage Vs1 for a long time, and in this case, an abnormal situation occurs in which the motor 8 is inadvertently continued to be energized.

However, in such a case, since the charge in the capacitor 15 is discharged through the resistor 20 after the auto mode switch 4 is turned off, the detected voltage Vp from point P becomes as shown by the two-dot chain line in FIG. (The time constant of the discharge circuit consisting of the capacitor 15 and the resistor 20 is about 100 seconds).

Then, when the time τ1 corresponding to the above-mentioned time constant has elapsed and the detection voltage Vp becomes lower than the reference voltage V s 2 (time t2 in FIG. 2), the second comparison circuit 36 is inverted to the on state. Become.

As a result, the transistors 42 and 48 are sequentially turned off as described above, so that the relay coil 9b is cut off, the relay switch 9a is returned to the on state between the contacts (c and b), and the motor 8 is cut off. In other words, when a predetermined time τ1 has elapsed since the motor 8 started driving in the auto mode, the motor 8 is automatically cut off, thereby preventing the occurrence of the above-mentioned abnormal situation. will be prevented.

Note that when the second comparator circuit 36 is turned on as the electric charge of the capacitor 15 is discharged through the resistor 20 or the resistor 30.31 as described above, the capacitor 1
5 is discharged through the diode 39 and the resistor 38 in a short time (about 0.1 seconds), so that chattering of the second comparison circuit 36 can be reliably prevented.

(c) When lowering the windshield in auto mode... In this case, if the manual down switch 3 is turned on and then the auto mode switch 4 is also turned on, the relay as described in (a) will be activated. When the contacts (C-a) of the switch 10a are turned on, the energizing path of the relay coil 10b and the motor 8 are turned on.
A reverse energization path is formed, the windshield begins to lower, and the power to the control circuit 7 is maintained.

In this case, as described in (b), capacitor 1
5 is instantly charged and the second comparison circuit 36 is turned off, the transistor 42 is turned on, and then the manual down switch 3 is turned on and the auto mode switch 4 is turned on.
When the transistor 49 is subsequently turned off, the transistor 49 is inverted to the on state. As a result, an energizing path to the relay coil 10b of the second relay 10 is formed between the normally open contacts (ca) of the relay switch 10a, through the diode 11b and the transistor 49, and also through the diode 11b and the transistor 49. The on state is maintained through the second comparator circuit 36, the transistor 42, and the like. As a result, even when the auto mode switch 4 and the manual down switch 3 are turned off, a reverse energization path for the motor 8 is continuously formed and the window glass is automatically lowered.

Then, when the window glass reaches the maximum lowered position (window fully open position), the motor 8 is locked and a relatively large locking current flows, so as in case (b), the first comparison circuit 23 is inverted to the on state, and as time τ0 passes thereafter, the second comparison circuit 36 is also inverted to the on state, and the transistors 42 and 49 are inverted to the on state.
are turned off sequentially. As a result, the relay coil 10b is de-energized and the relay switch 10a returns to the ON state between the contacts (c and b), thereby cutting off the reverse direction energization path of the motor 8, and the windshield stops at the maximum lowered position. be done. At this time, when the transistor 49 is off, the surge voltage generated in the relay coil 10b is transferred to the diode 55.5.
4b, and the transistor 4b is absorbed through the transistor 4b.
9 protection is provided.

Note that the explanation of other operations is omitted because it is the same as in case (b).

(d) When the windshield is raised in auto mode and the raising is stopped...When the windshield is raised in auto mode,
As is clear from the above description, capacitor 15 is in a charged state, and correspondingly, transistors 42 and 48 are maintained in an on state. When the manual down switch 3 is turned on for a short period of time in this state, the relay coil 10b is energized and the contacts of the relay switch 10a (
Since C-a) is turned on, both terminals of the motor 8 are short-circuited through the contacts (C-a) of relay switches 9a and 10a, and the motor 8 is immediately stopped due to power cut. .

Further, in this case, since the transistor 48 is in the on state, the diode 54a is in the change circuit 50.
The cathode potential of 3 is raised to the power supply voltage level, but as described above
When the diode 54b is turned on, the potential on the cathode side of the diode 54b also rises to the power supply voltage level. As a result, both diodes 54a and 54b are reverse biased, so that the voltage at point Q in the figure, which had been at the ground potential level, rises. Then, the resistor 52 is connected in parallel to the resistor 33 in the reference voltage generation circuit 35, and their combined resistance value decreases, so that the output of the reference voltage generation circuit 35 becomes the maximum voltage v w
It will be changed to a reference voltage Vs'2 (see FIG. 2) near ax. As a result, the detection voltage Vp becomes lower than the second reference voltage Vs'2, so the second comparator circuit 36 is turned on, transistors 42 and 48 are turned off, and at the same time, the charge in the capacitor 15 is Diode 39. It is rapidly discharged through the resistor 38.

As a result, the relay coil 9b is cut off and the relay switch 9a returns to the on state between the contacts (c and b), and the manual down switch 3 is turned off after being turned on for a short time as described above. When this happens, the relay coil 10b is cut off and the relay switch 10a returns to the on state between the contacts (c and b).
The motor 8 is returned to its initial state in which power is cut off.

The operation of each relay 9 and 10 as described above is stopped in a state before the on-operation of the manual down switch 3 is released, that is, in a state in which the power to the control circuit 7 is maintained through the manual down switch 3. Therefore, at the moment when each relay 9.10 stops operating, the reference voltage generation circuit 3 decreases as the Q point drops to its original potential level.
5 will return to the reference voltage V s 2.

However, in this case, the above recovery operation is delayed by the period during which the charging current flows through the capacitor 51, thereby preventing the second comparison circuit 36 from malfunctioning.

(E) When stopping the lowering of the windshield while it is being lowered in auto mode...When the windshield is being lowered in auto mode,
Capacitor 15 is in a charged state and transistors 42, 49 are turned on accordingly. In such a state, if the manual/return switch 2 is turned on for a short period of time, the motor 8 will be stopped immediately and the charge in the capacitor 15 will be transferred through the diode 39° resistor 38, as in the case (d) above. It becomes rapidly discharged,
Thereafter, when the manual up switch 2 is turned off, the motor 8 is returned to its initial state in which power is cut off.

According to the above embodiment, when operating in the manual mode, the relay coils 9b and 10b of the first and second relays 9 and 10 are energized by the first and second manual mode switches 2 and 3, respectively. Since the relay is directly controlled via a semiconductor switching element, there is no risk of deterioration in control reliability as in the conventional structure in which the relay is controlled via a semiconductor switching element during operation in manual mode.

Furthermore, in this embodiment, when the windshield is raised in the auto mode, that is, when the transistor 48 is kept in the on state and a positive direction energization path for the motor 8 is formed by the first relay 9, the motor The transistor 49 for controlling the second relay 10 forming the reverse current path 8 is disconnected from the DC power supply terminal 5. In addition, in this embodiment, the window glass is lowered in auto mode, that is, the transistor 4
9 is maintained in the on state and a reverse direction energization path of the motor 8 is formed by the second relay 10, the transistor 48 for forming a forward direction energization path of the motor 8 is disconnected from the DC power supply terminal 5. The configuration is such that Therefore, the power supply voltage is not applied to the transistors 49 or 48 while the windshield is rising or falling in the auto mode, so the transistors 49 or 48 may malfunction due to noise or the like and the windshield may move. This eliminates the possibility that the direction will change inadvertently, and the reliability of control by the control circuit 7 is further improved.

In addition, in this embodiment, a change circuit 5 provided to halfway stop the movement of the windshield in auto mode is used.
The diodes 54g and 54b in 0 are connected to the transistor 48
．． Since it is configured to also serve as a flywheel diode for 49 protection, the number of parts can be reduced.

In addition, when creating the rising movement of the windshield in auto mode, there is an auto-stop function (
If the function of detecting the lock current of the motor 8 and stopping it is impaired, each of the above operations can be stopped after a predetermined period of time using a timer function using the capacitor 15 and the resistor 20.

Therefore, there is no risk that the motor 8 will be inadvertently energized for a long time while it is in the locked state, and there is no risk that the motor 8 will overheat or the on-vehicle battery will be depleted.

[Effects of the Invention] According to the present invention, as is clear from the above description, when operating in the manual mode, the first and second relays for forming the forward and reverse direction energization paths of the motor are connected to the first and second relays. In addition, when operating in the auto mode, the auto mode switch of the first and second semiconductor switching elements for controlling the first and second relays is configured to be directly controlled by the manual mode switch No. 2. Because I configured it so that things unrelated to it are disconnected from the power supply,
It is possible to improve control reliability in manual mode, prevent malfunction of each semiconductor switching element, and improve control reliability in auto mode.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is an electric circuit diagram, and FIG. 2 is a capacitor discharge characteristic diagram for explaining the operation. In the diagram, 1 is a power window switch, 2 is a manual up switch (first manual mode switch), and 3 is a manual up switch (first manual mode switch).
is a manual down switch (second manual mode switch), 4 is an auto mode switch, 5 is a DC power terminal (power supply), 7 is a control circuit, 8 is a motor, 9 and 10
are first and second relays; 9a and 10a are relay switches; 9b and 10b are relay coils; 12 is a current detection resistor; 15 is a capacitor; 20 is a resistor; 29 is a first comparison circuit (cutoff circuit); 48 and 49 are transistors (first and second semiconductor switching elements), and 50 is a change circuit.

Claims (1)

[Claims] 1. A control device for a power window regulator that moves a window glass in a closing direction and an opening direction in response to energization of a motor in the forward and reverse directions,
first and second manual mode switches that are selectively turned on by an external operation; an auto mode switch that is turned on together with one of the first and second manual mode switches according to an external operation; Said first
a first relay that has a relay coil that is energized via a manual mode switch of the motor and forms a forward energization path for the motor through a normally open contact that is turned on in the energized state; a second relay that has a relay coil energized via the manual mode switch and forms a reverse energization path for the motor via a normally open contact that is turned on in the energized state;
a first semiconductor switching element that, when turned on together with a manual mode switch, forms an energizing path to the relay coil of the first relay via a normally open contact of the relay; a second semiconductor switching element that forms a current-carrying path to the relay coil of the second relay via a normally open contact of the relay when turned on together with the mode switch; A control device for a power window regulator, comprising: a holding circuit that maintains the on state for a period of time until the window glass reaches a fully closed position or a fully open position.