JPH0447088A - Control device for power window regulator - Google Patents

Abstract

PURPOSE:To miniaturize a control device for a power window regulator by providing a timer element capacitor which is charged up to a predetermined voltage level when an automode switch is turned on, and which discharges when a windshield pane has been moved to its full-close or -open position. CONSTITUTION:When an automode switch is turned on after a manual-up switch 2 is turned on, a first relay 9 is turned into an operative condition so that a capacitor 25 is charged instantly. Then, the relay 9 is held in this operative condition by a second comparing circuit 38 so that a motor 8 is energized to raise a windshield pane. When the windshield pane has reached its full close position, the motor 8 is locked so that a voltage drop across a current resistor 12 increases. Further, a first comparing circuit 29 is turned on so that the capacitor 25 discharges. When a detected voltage VP becomes lower than a reference voltage VS2, the operative condition in which the relay 9 is held is released so that the motor 8 is deenergized to stop the movement of the windshield pane.

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 vertical movement of the window glass is performed by energizing the motor in the forward and reverse directions, and the forward and reverse energizing paths of the motor are formed using two relays.

The operation of each relay in manual mode is controlled by the first and second switching elements (transistors are used to facilitate control in auto mode) which are turned on and off according to the operation of the manual up switch and manual down switch. (often controlled). In other words, during the on-operation period of the manual up switch, the first relay is operated by the first switching element to form a forward current conduction path for the motor, and during the on-operation period of the manual down switch, the first relay is operated by the first switching element. The element operates the second relay to form a reverse energization path for the motor, thereby moving the window glass in manual mode.

Further, in order to control the operation of each relay in the auto mode, a holding circuit as described below has been considered.

In other words, the holding circuit is connected to the first capacitor, which is instantly charged when the auto-up switch is turned on due to the operating state of the first relay (the first switching element is on!), and the second capacitor, which is charged instantly when the auto-up switch is turned on. and a second capacitor that is instantly charged when the auto-down switch is turned on in the operating state (on state of the first switching element), and as long as the voltage across one of these capacitors is above the specified voltage level. It is configured to include a comparison circuit that maintains the first switching element or the second switching element in the on state.Therefore, once the auto-up switch or auto-down switch is turned on, even after it is turned off. The first or second switching element is held in the on state, and during this time the window glass is moved upward (closing direction) or downward (opening direction).

At this time, the holding circuit is provided with a cut-off circuit that operates by detecting the lock current of the motor.
This cutoff circuit is configured to rapidly discharge the charges in the first and second capacitors according to its operation. Therefore, when the windshield is moved to the fully closed position or the fully open position, the cutoff circuit operates and the voltage across the first and second capacitors drops below the specified voltage level, so that the comparator circuit The holding of the on state of the soching element is released, and the relay stops operating in response to this, the motor is cut off, and the window glass is automatically stopped at the fully closed position or the fully open position.

Further, the charges in the first and second capacitors are discharged through a resistor with a relatively long time constant, and a timer function is obtained by the discharge. In other words, if the cutoff circuit does not function properly, the first
Since the voltage across the second capacitor is lowered to below the specified voltage level, the comparator circuit releases the on state of the switching element and cuts off the power to the motor. This prevents a situation in which electricity is turned on for an abnormally long time.

When the first switching element is turned on, the charge on the second capacitor is instantly discharged through the switching element, and when the second switching element is turned on, the charge on the first capacitor is discharged through the switching element. The structure is such that the battery is instantly discharged through the switching element. As a result, when the manual down switch is turned on while the windshield is being moved upward in auto mode, the charge in the first capacitor is instantly discharged through the second switching element. ,
As a result, the holding state by the holding circuit is released and the window glass is immediately stopped.

In addition, when the manual up switch is turned on while the windshield is being moved downward in auto mode, the charge in the second capacitor is instantly discharged through the first switching element, which causes it to be retained. Immediately after the holding state by the circuit is released, the windshield is stopped.

(Problems to be Solved by the Invention) In the conventional configuration, in order to obtain the function of canceling the movement state of the windshield in auto mode as described above,
First and second capacitors are provided as timer elements for preventing abnormal energization of the motor. In such a configuration, the first, 'th, and second capacitors have relatively large capacities because it is necessary to increase the discharge time constant for the timer function. However, such capacitors are large in size and relatively expensive, so a conventional configuration that requires two relatively large capacity capacitors would result in an increase in overall size and cost. Therefore, this point remained an unresolved issue.

The present invention has been made in view of the above circumstances, and its purpose is to provide a function to cancel the movement state of the windshield in auto mode midway through, while also providing a function necessary to prevent abnormal energization of the motor. By simply providing one capacitor for the timer function, the overall size and cost can be reduced, and the circuit configuration to achieve this effect can be simplified as much as possible. The present invention provides a control device for a power window caliper.

[Structure of the Invention] (Means for Solving the Problem) In order to achieve the above object, the present invention provides a motor that moves a window glass in a closing direction and an opening direction in response to forward and reverse direction energization, and a first motor. and a first and second relay that respectively form a forward current conduction path and a reverse direction current conduction path of the motor in each state selectively operated by a second manual mode switch; In a power window regulator control device that automatically moves a windshield to a fully closed position or a fully open position when an auto mode switch is turned on with one of the relays operating, the auto mode switch is a capacitor for a timer element that performs a discharging operation after being charged to a predetermined voltage level when turned on; a comparison means that maintains the operating state of the relay as long as a detection voltage corresponding to the voltage across the capacitor is equal to or higher than a reference voltage; a cut-off circuit that discharges the charge in the capacitor when the windshield is moved to a fully closed position or a fully open position; The configuration includes a changing circuit that changes the voltage to be higher than the detection voltage.

(Function) When the auto mode switch is turned on with one of the first and second relays operating, the timer element capacitor will start discharging after being charged to a predetermined voltage level. , the state in which the detection voltage corresponding to the voltage across the capacitor exceeds the reference voltage continues for a predetermined timer period. Then, the comparison means maintains the operating relay as it is, and even after the auto mode switch and each manual mode switch are turned off, the windshield does not move in the closing or opening direction. It continues for a specified period of time. Then, when the window glass reaches the fully closed position or the fully open position, the cutoff circuit discharges the charge in the capacitor, so that the detected voltage falls below the reference voltage. As a result, the operation holding state of the relay by the comparison means is released, so that the power to the motor is automatically cut off.

In addition, if you want to cancel the automatic movement state of the windshield as described above, turn on either the first or second manual mode switch to turn on both the first and second relays. make it work. Then, the reference voltage is changed by the changing circuit to a voltage level higher than the detection voltage, and the comparison means releases the relay from the operation holding state, thereby cutting off the power to the motor and stopping the windshield. Ru.

(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 edge 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 operating 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 these switches 2 to 4 has one end connected to a DC power supply terminal 5 via a diode 6 with the polarity shown, and the other end connected to terminals Ta and Tb of a control circuit 7, which will be described later.
, 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 10g 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. In addition, in the relay switches 9a and 10a, each normally closed contact a is connected to the DC power supply terminal 5, and each normally closed contact is connected to the ground 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 the terminal Td of the control circuit 7.

Relay coil 1 of second relay 10
0b is connected between the terminals Te and Tg of the control circuit 7.

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

The control circuit 7 is composed of, for example, a hybrid IC, and has terminals Ti, Tj in addition to the above-mentioned terminals Ta-Th.
has. At this time, the terminal Ti is connected to the ground terminal, and the terminal Tj is connected to the ground terminal via a resistor 13 for generating a first reference voltage V s 1, which will be described later.

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

That is, a constant voltage diode 14 (Zener voltage of about 9 V) is connected between the bus line La and the auxiliary bus line Lb with the illustrated polarity, and the bus line La is connected to the diode 16a through the protective resistor 15 of the constant voltage diode 14. 16b, and the auxiliary bus line Lb is connected to the terminal Tf (that is, the ground terminal). The above diodes 16a, 16b
The anodes are connected to the auxiliary bus line Lb via resistors 17a and 17b, respectively, and are also connected to terminals Td and Te.

The terminal Ta corresponding to the manual up switch 2 is connected to the terminal Td through a diode 18a in the forward direction, and is connected to the auxiliary bus line Lb through a resistor 19.20 in series. The terminal Tb corresponding to the manual down switch 3 is connected to the terminal Te through the diode 18b in the forward direction.
It is also connected to the auxiliary bus line Lb via resistors 21 and 22 in series. The terminal Tc corresponding to the auto mode switch 4 is a resistor 231 and a diode 2 with the polarity shown.
4 and a capacitor 25, which is a timer element, are connected to the auxiliary device 1Lb in series. Furthermore, this capacitor 2
5 requires a relatively large capacity, so for example, an electrolytic capacitor is used.

A discharge resistor 26 is connected to both ends of the capacitor 25, and the discharge time constant of the capacitor 25 via this resistor 26 is set to, for example, about 10 seconds. still,
The resistor 23. Capacitor 25 via diode 24
The charging time constant is set to about 0.011 seconds, for example.

On the other hand, the auxiliary reference voltage generation circuit 2 is connected by the resistor 27 and the resistor 13 connected in series between the bus line La and the terminal Tj.
8, and the auxiliary reference voltage Vsi is output from the common connection point of the resistors 13°27.

The first comparator circuit 29, which is a cutoff circuit, is provided so as to be supplied with power through the bus line La and the auxiliary bus line Lb, although not shown. This constitutes a well-known auto-stop circuit in the regulator. In this case, the first comparison circuit 29
The terminal Th is connected to compare the auxiliary reference voltage Vsl applied through the terminal Th with the voltage Vd applied from the terminal Th through the resistor 3. Furthermore, the first comparator circuit 29 is of an oven collector output type, and when the relationship Vsl > vd, it exhibits an off state with a large output resistance (a state where the internal output stage transistor is turned off), but VS1
When the relationship ≦Vd changes, the output resistance is reversed to the on state (the output stage transistor is on) with a small output resistance.

2. The output terminal of the first comparison circuit 29 is connected to the positive terminal of the capacitor 25 through a resistor 32, 33 in series, and a voltage clamping resistor is connected in parallel to this resistor 33. constant voltage diode 34 (Zener voltage V
zd≠5V) are connected with the polarities shown. As a result of this connection, the discharge current from the capacitor 25 flows through the resistors 32 and 33 while the two first comparison circuits are turned on (at this time, a negligible discharge current also flows through the resistor 26). From the start of such discharge, P in the figure
The time τ0 required for the voltage at the point (common connection point of the resistors 32 and 33), that is, the detection voltage Vp to decrease to the level of a reference voltage V S 2 described later, is set to about 0°7 seconds.

In this case, the resistance ratio of the resistors 32 and 33 is, for example, 1:
It is set to about 100, and therefore, the above-mentioned discharge time τ0 is substantially determined by the resistor 33. Therefore, at the start of discharge via the resistors 32 and 33 as described above, the detection voltage Vp from point P is
The voltage is clamped to the Zener voltage Vzd of 4, and gradually decreases from the clamp voltage Vzd.

A reference voltage generation circuit 37 consisting of a series circuit of resistors 35 and 36 is connected between the bus line La and the auxiliary bus line Lb.
A reference voltage VS2 is output from the common connection point of the resistors 35 and 36. In this case, the reference voltage V s 2 is set lower than the Zener voltage Vzd of the voltage regulator diode 34 .

Although not shown, the second comparison circuit 38 serving as comparison means 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 comparison circuit 38 is also of an open collector output type similar to the first comparison circuit 29, and V s 2 <'J
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.

At this time, a series circuit of three diodes with the polarities shown and a resistor 4o is connected between the output terminal of the second comparison circuit 38 and the cathode of the diode 24, and the anode of the diode 24 and the bus line are connected. Between La and a,
A diode 41 of the illustrated polarity for positive clamping is connected. Furthermore, the output terminal of the second comparison circuit 38 and the bus line L
A resistor 42 is connected between the terminal a and the terminal a. Note that when the second comparator circuit 38 is turned on while the capacitor 25 is in a charged state, the charged charge is discharged through the resistor diode 39, but the discharge time constant is about 0.1 seconds. is set to .

The collector and emitter of the npn transistor 43 are connected to the terminal Tf and the auxiliary bus line Lb, respectively. The base of this transistor 43 is connected to the resistors 19 and 2o.
The terminal Td is connected to the common connection point of the terminal Td through a series circuit of a diode 44 and a resistor 45 having polarities shown. At this time, the anode of the diode 44 is
It is connected to the output terminal of the second comparison circuit 38 via a diode 46 with the polarity shown. In addition, the transistor 43
A diode 47 having the illustrated polarity is connected between the collector of the terminal Td and the terminal Td.

The collector and emitter of the npn transistor 48, which is the second semiconductor switching element, are connected to the terminal Tg and the auxiliary bus line Lb, respectively.

The base of this transistor 48 is connected to the resistors 21 and 2.
It is connected to the common connection point of the two terminals Te, and is also connected to the terminal Te through a series circuit of a diode 49 and a resistor 50 having the polarities shown. At this time, the anode of the diode 49 is connected to the second comparator circuit 3 via the diode 51 of the illustrated polarity.
It is connected to the output terminal of 8. Furthermore, a diode 5 with the polarity shown is connected between the collector of the transistor 48 and the terminal Te.
2 is connected.

The changing circuit 53 provided in association with the reference voltage generating circuit 37 has the following configuration.

That is, a capacitor 54 is connected in parallel with the resistor 35 in the reference voltage generating circuit 37, and a series circuit of a resistor 55 and a diode 56 of the polarity shown is connected in parallel with the capacitor 54. And between the common connection point Q of the resistor 55 and the diode 56 and the terminals Td and Te, there is a
Diodes 57a and 57 of the illustrated polarity forming the ND circuit
b is connected.

Now, the operation of the above configuration will be explained below with reference to FIG. 2 as well.

(a) When moving the windshield up and down in manual mode... To raise the windshield, turn on the manual up switch 2. Then, a base current is applied to the transistor 43 from the DC power supply terminal 5 via the diode 6, the manual up switch 2, and the resistor 19, so that the transistor 43 assumes an on state. At the same time, the diode 6, manual up switch 2. Since the current is applied through the diode 18a and the transistor 43, the first relay 9 operates and the relay switch 9
The contact a (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. When the manual up switch 2 is turned off when the windshield is raised like this, the transistor 43 is turned off and the relay coil 9b is cut off, so that the relay switch 9a returns to the on state between the contacts (c and b). Then, the forward current conduction path of the motor 8 is cut off, and accordingly, the windshield is stopped from rising.

Further, when lowering the windshield, if the manual down switch 3 is turned on, the relay coil 10b of the second relay 10 is energized in accordance with the turning on of the transistor 48, and the second relay 10 is accordingly activated. Since the contacts (C-a) of the relay switch 10a are then 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 transistor 48 is turned off, so the relay switch 10a returns to the on state between the contacts (c and b), and the motor 8 is turned on in the reverse direction. The electrical circuit is cut off and the lowering of the window glass is stopped.

Note that when the transistor 43 is turned on as described above, the resistor 45 is connected to the DC power supply terminal 5 through the diode lla and the contact point (c-a) of the relay switch 9a, and , transistor 48
is turned on, the resistor 50 connects the DC power supply terminal 5 to the diode llb and the relay switch 10a.
It will be in a state where it is connected via the contact point (c-a) of
At this time, since the second comparison circuit 38 is on,
The current flowing into each of the resistors 45 and 50 is sucked into the output terminal of the second comparison circuit 38 via the diode 46 or 51, respectively. Therefore, each transistor 43
No base current is supplied to transistors 43 and 48 through resistor 45 or 50, and transistors 43 and 48
is reliably turned off in conjunction with each turning off of the manual up switch 2 and the manual down switch 3.

(b) When raising the window glass in auto mode... When the manual up switch 2 is turned on and then the auto mode switch 4 is also turned on, the transistors 43 are turned on as described in (a). By turning on the contacts (C-a) of the NO switch 9a, 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 contact point (c-a) is between the DC power supply terminal 5 and the auxiliary bus line Lb connected to the ground terminal.

Diode lla, 16a, resistor 15. They are connected via the bus line La and the constant voltage diode 4.

Therefore, a DC constant voltage output is provided between the bus line L3 and the auxiliary bus line Lb, and the power supply for the control circuit 7 is maintained.

However, when the auto mode switch 4 is turned on,
As will be understood from the description below, since the first comparison circuit 29 is in the off state, the capacitor 25 is instantly charged through the resistor 23 and the diode 24 (the charging time is 0).
．． 011 seconds). As a result, as shown in Fig. 2, P
The detected voltage Vp from the point increases instantaneously to the maximum voltage Vmax (corresponding to the voltage obtained by dividing the power supply voltage by a resistor 23.degree. 26). As a result, the detected voltage Vp becomes larger than the reference voltage V s 2 from the reference voltage generation circuit 37, so that the second comparison circuit 38 is turned off.

In such an output inversion state, the diode 46 is reverse biased, so that the voltage between the DC power supply terminal 5 and the contact point (c-a) of the relay switch 9a is connected to the transistor 43.
A base current is supplied through the diode 1]a, the resistor 45, and the diode 44, and the transistor 43 is maintained in an on state.

In this way, when the on state of the transistor 43 is maintained by the second comparison circuit 38, the energization path of the relay coil 9b passes through the contacts (ca) of the relay switch 9a, the diode lla, and the transistor 43. [7] Therefore, even when the auto mode switch 4 and the manual up switch 2 are subsequently turned off, the positive direction energization path of the motor 8 continues to be formed. The windshield will be raised automatically.

Then, as mentioned above, when the windshield is automatically raised and reaches the maximum raised position (the fully closed position of the window), the motor 8 is locked and a relatively large locking current flows. Current detection resistor 12 according to
voltage drop increases. In response to such an increase in voltage drop, when the voltage Vd applied to the terminal Th becomes larger than the auxiliary reference voltage V s 1 from the auxiliary reference voltage generation circuit 28, the first comparator circuit 29 is turned on. It becomes like this.

Then, the charge in the capacitor 25 comes to be discharged through the resistor 32, 33 and the output terminal of the first comparator circuit 29, 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 constant voltage diode 34, and decreases from the clamp voltage Vzd at a speed corresponding to the resistance value of the resistor 32.33. As time τ0 (approximately 0.7 seconds) passes after the start of such discharge, when the detection voltage Vp becomes lower than the reference voltage V S 2 (time t1 in FIG. 2), the second comparator circuit 38 Flip to on state.

As a result, the base current applied to the transistor 43 through the resistor 45, diode 44, etc. is sucked into the output terminal of the second comparison circuit 38 through the diode 46, and the transistor 43 is turned off. As a result, the relay coil 9b is cut off and the relay switch 9a returns to the ON state between contacts Cc and b)] 7. As a result, the forward direction energization path of the motor 8 is cut off, and the windshield stops at the maximum raised position. be done. As described above, as the charge in the capacitor ]9 is discharged over a period of time τ0, so-called retightening of the window glass is performed during this time.

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, , the voltage Vd may not exceed the auxiliary reference voltage Vs1 no matter how long it takes, and in this case, an abnormal situation occurs in which the motor 8 is inadvertently continued to be energized.

However, in such a case, the charge in the capacitor 25 is discharged through the resistor 26 after the auto mode switch 4 is turned off, so 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 25 and the resistor 26 is about 10 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 38 is inverted to the on state. Become.

As a result, the resistance is 45. Since the supply of base current to the transistor 43 via the diode 44 is stopped and the transistor 43 is turned off, the relay coil 9b is cut off and the relay switch 9a returns to the on state between the contacts (c and b). Then, the motor 8 is cut off. In other words, motor 8
A predetermined time τ1 after starting to drive in auto mode
When this period has elapsed, the motor 8 is automatically cut off, thereby preventing the above-mentioned abnormal situation from occurring.

Note that when the second comparator circuit 38 is turned on as the electric charge of the capacitor 25 is discharged through the resistor 26 or the resistor 32, 33 as described above, the capacitor 2
The charging charge of 5 is the resistance 4o.

Since the discharge occurs through the diode 39 in a short period of time (about 1 degree), chattering of the second comparator circuit 38 can be reliably prevented.

(c) When lowering the window glass 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 transistor as described in (a) 48 and between the contacts (C-a) of the relay switch 10a, an energizing path for the relay coil 10b and a reverse energizing path for the motor 8 are formed, and the windshield starts lowering, and the control circuit 7 is turned on. power will be maintained.

In this case, as described in (b), capacitor 2
5 is instantly charged and the second comparison circuit 38 is turned off, the diode 51 is reverse biased, and accordingly, the transistor 48 is connected from the DC power supply terminal 5 to the contact point (c-a) of the relay switch 10a. ), diode 1
A base current is supplied through the transistor 1b, the resistor 50, and the diode 49, and the on state of the transistor 48 is maintained by the second comparator circuit 38.

As a result, the energizing path of the relay coil 10b is connected between the contacts (C-a) of the relay switch 10a, the diode llb,
h transistor 48, and even when the auto mode switch 4 and manual down switch 3 are subsequently turned off, the reverse direction energization path of the motor 8 is continuously formed and the windshield automatically opens. be 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 29 is inverted to the on state, and as time τ0 passes thereafter, the second comparison circuit 38 is also inverted to the on state.

Therefore, transistor 48 is connected to resistor 50. diode 49
The base current given through diode 5
1 to the output terminal of the second comparator circuit 38, thereby turning off the transistor 48. As a result, the relay coil 10b is cut off 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 returns to the maximum lowered position. will be stopped.

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, the capacitor 25 is in a charged state, and accordingly, the transistor 43 is maintained in an on state.

In this state, when the manual down switch 3 is turned on for a short period of time, the transistor 48 is turned on in response to this, and the relay coil 10b is energized, and the relay switch 1. Since the contacts (C-a) of Oa are 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 disconnected. Electricity is suspended.

In addition, when the manual down switch 3 is turned on as described above, that is, the first and second
When both are operated, the cathodes of the diodes 57a and 57b are simultaneously raised to the power supply voltage level and reverse biased in the change circuit 53.
The voltage at point Q in the figure, which had been at the ground potential level until then, also begins to rise. Then, the reference voltage generation circuit 37
Since the resistor 55 is connected in parallel to the resistor 35 in the inner part and the combined resistance value thereof decreases, the output of the reference voltage generating circuit 37 becomes the reference voltage VS'2 (second (see figure). Thereby, the detection voltage Vp becomes the second reference voltage v s'
, becomes lower, so the second comparator circuit 38 is turned on and the transistor 43 is turned off, and at the same time, the charge in the capacitor 25 is quickly discharged through the resistor 40 and three diodes.

As a result, the relay coil 9b is de-energized and the 1-no switch 9a returns to the on state between the contacts (c and b), and after the manual down switch 3 is turned on for a short time as described above. When the relay coil 10b is turned off, the relay coil 10b is cut off and the relay switch 10a is also returned to the on state between the contacts (c and b), thereby returning the motor 8 to its initial state where the 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.
7 will return to the reference voltage Vs2. However, in this case, the recovery operation is delayed by the period during which the charging current flows through the capacitor 54, thereby preventing the second comparison circuit 38 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, the capacitor 25 is in a charged state, and accordingly Transistor 48 is turned on.

In this state, when the manual up switch 2 is turned on for a short period of time, the motor 8 is immediately stopped and the charge in the capacitor 25 is transferred to the resistor 40. Rapid discharge occurs through the diode 39, and when the manual up switch 2 is subsequently turned off, the motor 8 is returned to its initial state where the power is cut off.

According to the configuration of this embodiment described above, the raising movement of the windshield in the auto mode can only be created if the auto stop function (the function that stops the lowering movement by detecting the lock current of the motor 8) is impaired. is capacitor 2
5 and resistor 26, each of the above operations can be stopped after a predetermined period of time. 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.

In this case, in order to cancel the moving state of the windshield in the auto mode, it is necessary to rapidly discharge the charge in the capacitor 25 in response to the ON operation of the manual up switch 2 or the manual down switch 3. However, in this embodiment, we focus on the fact that when the manual up switch 2 or the manual down switch 3 is turned on as described above, the first and second relays 9 and 10 are operated simultaneously. A change circuit 53 is provided that changes the reference voltage VS2 to be higher than the detection voltage Vd from point P as the operation progresses, thereby turning on the second comparison circuit 38 and rapidly discharging the charge in the capacitor 25. There is. As a result, only one capacitor 25 needs to be provided, and there is no risk of increasing the overall size and cost unlike the conventional configuration that requires two relatively large capacity capacitors. be.

The change circuit 53 includes a small capacitor 54, a resistor 55 . Since it is made up of diodes 56, 57a, and 57b, it is possible to create these at the same time when manufacturing the control circuit 7 made of a hybrid IC, thereby making it possible to simplify the circuit configuration as much as possible.

Further, according to the configuration of this embodiment, the transistor 43 is
The transistor 48 is connected to the DC power terminal 5 via the manual up switch 2.
Since the transistors 43 and 48 are connected to each other via the manual down switch 3, in a steady state in which the switches 2 and 3 are off, the voltage from the DC power supply terminal 5 is applied to the transistors 43 and 48. Therefore, there is no risk that the transistors 43 and 48 will malfunction due to noise, and control reliability by the control circuit 7 will be improved.

[Effects of the Invention] According to the present invention, as is clear from the above description, a window regulator is provided in which the moving state of the windshield in auto mode is maintained based on the detected voltage corresponding to the voltage across the capacitor for the timer element. In a control device, only one capacitor is required, which reduces the overall size and costs, and also makes it possible to simplify the circuit configuration to achieve this effect as much as possible. It is effective.

[Brief explanation of the drawing]

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, 7 is a control circuit, 8 is a motor, 9 and 10 are first and second relays 9a, 10a are relays switch, 9b,
10b is a relay coil, 12 is a current detection resistor, 25 is a capacitor, 26 is a resistor, 29 is a first comparison circuit (cutoff circuit), 38 is a second comparison circuit (comparison means), 43
．． 48 is a transistor, and 53 is a change circuit.

Claims (1)

[Claims] 1. A motor that moves the window glass in the closing direction and the opening direction in response to energization in the forward and reverse directions, and a motor that is selectively operated by first and second manual mode switches, and the motor is operated in each operating state. and a first and second relay forming a forward energizing path and a reverse energizing path, respectively, and when the auto mode switch is turned on with one of the first and second relays operating. For a timer element that performs a discharging operation after being charged to a predetermined voltage level when the auto mode switch is turned on, in a power window regulator control device that automatically moves the window glass to a fully closed or fully open position. a capacitor, a comparison means for maintaining the operating state of the relay while a detection voltage corresponding to the voltage across the capacitor is equal to or higher than a reference voltage, and a comparison means for maintaining the operating state of the relay when the window glass is moved to a fully closed position or a fully open position. A cutoff circuit that discharges the charge in the capacitor, and a change circuit that changes the reference voltage to be higher than the detection voltage when both the first and second relays are operated. A power window regulator control device featuring: