JPH0958349A - Controller for motor driven housing type door mirror - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact small volume door mirror by providing an NPN type transistor and PNP type transistor having respectively emitters and collectors bypassing both ends of a relay for making a current value flowing in the zero or minute and connected to both ends of the relay. SOLUTION: A contact between a drive motor M and resistance R3 is also connected to the resistance R2 and the other end side of the resistance R2 is branched into two systems. One system is connected to the base of an NPN type transistor Q1 and the other is connected to the base of a PNP type transistor Q2. The collectors of the respective transistors Q1, Q2 are together connected to the connection of a relay coil Rc and resistance R1 and emitters are together connected to the contact C2. A relay circuit 3 and relay controlling circuit 4 can be provided as a unit in a cabin of a vehicle and since the circuit can be simply miniaturized, these circuits can be combined with a switch circuit 2 to be incorporated in a switch unit or a mirror housing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an electric retractable door mirror, which electrically or electrically retracts the door mirror, and more particularly, to improve the quality and reliability of the electric retractable door mirror and to simplify the operation. The present invention relates to a control device for an electric retractable door mirror, which can achieve downsizing and capacity reduction of a door mirror by a small circuit, improve safety during operation of the door mirror, and can be provided at low cost.

[0002]

2. Description of the Related Art Generally, a door mirror is mounted so as to project from the side of a vehicle body. Therefore, the protruding door mirror may be an obstacle when the vehicle is put in a garage or the like, and therefore an electrically retractable door mirror that can be stored has been proposed.
The electric retractable door mirror is, for example, the actual open sho 63-1693.
As disclosed in No. 41 Micro Film, a shaft is erected on an overhanging portion of a base fixed to a vehicle door panel or a triangular window, and a spring and a clutch gear are fitted on a frame fitted on the shaft, and a clutch is provided. After pressing the spring by the receiver, the clutch receiver is fixed to the shaft. The clutch gear meshes with a pinion gear that rotates via a reduction mechanism by a motor built in the mirror body, and the mirror body rotates about the shaft by driving the motor.

This rotating portion will be described. As shown in FIGS. 6 and 7, a stopper plate 48 constituting a rotation restricting means 47 when the mirror body is raised is provided on a shaft 42 standing on a projecting portion 41 of a base 40. The frame 44 of the mirror body 45 is rotatably fitted and inserted via the ball 49 and the ball 49. The ball 49 is fitted into a concave spherical seat (not shown) at the bottom of the frame 44, and when the mirror body 45 rotates, the ball 49 rotates together with the frame 44 to reach the standing position, as shown in FIG. The ball 49 contacts the stopper step portion of the stopper plate 48.

Further, when the convex portion 51 is provided on the base plate 43 fixed on the projecting portion 41, while the fitting groove 52 is provided on the lower surface of the frame 44, the frame 44 rotates about the shaft 42. Rotates while the fitting groove 52 on the frame side is guided by the convex portion 51.
As shown in FIG. 8, when the mirror body 45 is at the storage position, the convex portion 51 that constitutes the rotation restricting means 50 at the time of storage.
Comes into contact with one end 53 of the fitting groove 52 to stop the rotation of the mirror body 45.

In order to stop the rotation of the mirror body at the standing position or the storing position when the electric retractable door mirror is erected or stored, the following method is generally used as a control method for shutting off the drive circuit of the motor. Has been. One of them is a mechanical switch method (limit switch, plate contact switch, etc.)
There is. As another method, a method of utilizing the characteristics of the PTC element and interrupting the circuit by increasing the current when the motor is locked (Actual No. 4-76196 microfilm) is also disclosed. Further, it is also known that the rotation of the motor is detected by a sensor such as a photo reflector or a magnetic sensitive element to control the motor.

[0006]

However, the above circuit breaking method has the following problems. That is,
With the mechanical switch method, it is difficult to align the mirror body with the circuit switching position in the upright position or the storage position, and malfunctions such as contact failure are likely to occur due to the inclusion of foreign matter in the contact portion. Further, in the method using the PTC element, there is a large time lag from when the motor is overloaded to when the PTC element reaches a predetermined temperature, and during that time, the motor is continuously supplied with electric power. As a result, the mirror body gets over the regulated position and the position accuracy is reduced, the motor is burned, the drive system is loaded and the durability of parts is reduced, and overcurrent that continuously flows into the circuit system causes heat to be generated. There was a risk of deterioration of parts and ignition.

Further, in the method of detecting the rotation of the motor, there is a concern that dust, dirt, or the like may adhere to the sensor portion to cause a malfunction. In addition, in order to reflect the signal from the sensor in the control signal of the motor, a complicated electronic circuit such as an amplifier circuit and a drive circuit is required, which causes a problem of cost increase. The present invention solves the above problems, improves the quality and reliability of an electric retractable door mirror, and can achieve downsizing and capacity reduction of the door mirror with a simple and small circuit. It is an object of the present invention to provide a control device for an electric retractable door mirror that can improve safety of the vehicle and can be provided at low cost.

[0008]

In order to achieve the above object, the invention of claim 1 rotates a drive motor mounted on a vehicle door mirror in a normal or reverse direction to rotate the door mirror to an upright position and a retracted position. In a control device for an electric retractable door mirror, a series circuit including a DC power supply, an on / off switch, a drive motor, and a voltage dividing resistor connected in series, both ends of which are connected to the DC power supply, the DC power supply and the series circuit A polarity switching circuit that switches the polarity of the connection with the start-up capacitor that stores electric charge when power is applied to the series circuit by the polarity switching circuit, and a current that flows when the electric charge is stored in the startup capacitor. A voltage value applied to the relay which is excited and turns on / off the switch, and which is self-held by turning on / off the switch and the voltage dividing resistor. It is conductive when it exceeds the predetermined value,
It is characterized in that it has an NPN transistor and a PNP transistor whose emitter and collector respectively bypass the both ends of the relay and make the value of the electric current flowing through the relay zero or minute, and which are connected to both ends of the relay.

According to a second aspect of the present invention, there is provided an electric retractable door mirror control device for rotating a drive motor mounted on a vehicle door mirror in a forward or reverse direction to rotate the door mirror to an upright position or a retracted position. It consists of a DC power supply, an on / off switch, a drive motor, and a voltage divider resistor connected in series.
A series circuit having both ends connected to the DC power supply, a polarity switching circuit that switches the polarity of the connection between the DC power supply and the series circuit, and a charge when the series circuit is powered on by the polarity switching circuit. And a relay that is excited by a current that flows when electric charge is stored in the starting capacitor to turn on the on / off switch, and that is self-held by turning on / off the switch, and the voltage divider. An integrating circuit that integrates the voltage across the resistor,
When the integrated value of the integrator circuit exceeds a predetermined value, it is conducted,
It is characterized in that it has an NPN type transistor and a PNP type transistor whose emitter and collector respectively bypass the both ends of the relay and make the current value flowing through the relay zero or minute, and which are connected to the both ends of the relay.

According to the electric retractable door mirror controller of the first aspect of the present invention constructed as described above, the rotation of the door mirror comes into contact with the rotation stopper during normal rotation of the door mirror to stop rotation, or other external force or obstacle. When the rotation stops due to the contact with the drive motor, the drive motor is overloaded and the current value increases. As a result, the voltage of the voltage dividing resistor connected in series with the drive motor increases, and when this voltage exceeds the switching voltage of the PNP type transistor (NPN type transistor), the emitter of the PNP type (NPN type) transistor, Since the collector is electrically connected, and the emitter and collector are connected in parallel to both ends of the relay, the current supplied to the relay is bypassed to the transistor side, the relay is turned off, and the self-holding of the switch is released. . Then, by this, the drive motor is stopped.

Further, when the door mirror is rotated in reverse, the polarity of the voltage applied to the drive motor is opposite to that in the normal rotation, so that the voltage across the voltage dividing resistor is NPN type transistor (PNP type transistor). The relay is turned off when the switching voltage of is exceeded and the self-holding is released to stop the drive motor. The electric retractable door mirror storage device according to claim 2 of the present invention is substantially the same as the case of claim 1 described above, but according to claim 1, each transistor is dependent on the magnitude of the voltage across the voltage dividing resistor. On the other hand, in the invention of claim 2, the voltage across the voltage dividing resistor is integrated, and each transistor (PNP type, NPN type) is switched when the integrated value exceeds a predetermined value. Therefore, for example, it becomes possible to prevent the transistor from being switched by the transient current when the drive motor is started.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a circuit diagram showing an embodiment of a controller for an electric retractable door mirror according to the present invention. As shown in FIG. 1, the electric retractable door mirror control device 1 is roughly divided into a power source E, a switch circuit 2 as a polarity switching circuit, a relay circuit 3, a relay control circuit 4, and a drive motor M. It is configured. The power source E is a battery that is usually mounted on a vehicle. The switch circuit 2 is constituted by a switch having two contacts and two circuits. The positive contacts of the power source E are connected to the contacts A1 and B2, and the negative contacts of the power source E are connected to the contacts A2 and B1. , 6 operate in conjunction with each other, so that positive and negative voltages are reversibly output to the contacts C1 and C2.

The switch circuit 2 is installed around a driver's seat such as an instrument panel in a vehicle compartment and is switched by a driver. Relay circuit 3
Is a relay contact R as an on / off switch for the drive motor M.
The capacitor C for starting is connected in parallel to a and the resistor R1, and the relay coil Rc arranged between the resistor R1 and the contact C2 is excited by the charging current of the capacitor C so that the relay contact Ra is closed. Has become. The contact C1 of the switch circuit 2 is closed by closing the relay contact Ra.
Is connected to the contact C2 of the switch circuit 2 via the relay contact Ra, the resistor R1, and the relay coil Rc, and is a circuit for holding the relay contact Ra by itself.

Further, the relay control circuit 4 has a relay contact R
The drive motor M and the resistor R3 are connected in series from a and are connected to the contact C2 of the switch circuit 2. The contact point between the drive motor M and the resistor R3 is also connected to the resistor R2, the other end of the resistor R2 is branched into two tilts, and one is
It is connected to the base of the NPN transistor Q1 and the other is connected to the base of the PNP transistor Q2.
The collectors of the transistors Q1 and Q2 are both connected to the connecting portion between the relay coil Rc and the resistor R1, and the emitters are both connected to the contact C2. The relay circuit 3 and the relay control circuit 4 are installed as a unit in the vehicle compartment, or combined with the switch circuit 2 into a switch unit or a mirror housing (mirror body) because the circuit is simple and can be downsized. It is possible.

Next, the operation of this embodiment configured as described above will be described. (1) When the door mirror rotates from the upright position to the storage position; the switch circuit 2 is operated to perform the storage operation. When the movable contacts 5 and 6 are brought into contact with the contacts A1 and A2, a charging current instantaneously flows from the contact C1 in contact with the contact A1 to the starting capacitor C. This charging current excites the relay coil Rc, closes the relay contact Ra, and becomes the energized state. The current flows through the contact C1 → the relay contact Ra → the resistor R1 → the relay coil Rc → the contact C2, and holds the relay contact Ra by itself. In addition, the electric current flows through the contact C1 → relay contact Ra → motor M → resistance R3 → contact C2, the motor M starts rotating, and the door mirror starts rotating in the storing direction. When the door mirror is mechanically stopped from rotating in the storage position by the rotation restricting means (FIG. 2) described later, the rotation of the motor M is also stopped.

Due to this rotation stop, the drive current of the motor M increases, and the voltage applied across the resistor R3 in the relay control circuit 4 also increases accordingly. When this voltage exceeds the forward voltage of the PN junction of the NPN transistor Q1, the transistor Q1 is turned on, that is, the current is conducted from the collector side to the emitter side. Then, due to this conduction, the voltage across the relay coil Rc becomes substantially zero, so that the current flowing through the relay coil Rc becomes zero or minute, and the excitation is released. Along with this, the self-holding by the relay contact Ra is released, and the drive motor M
The power supply to the drive motor is stopped, and the drive motor M is stopped.
That is, when the rotation of the drive motor M is stopped, the motor M
Is automatically stopped, so that, for example, even when the rotation is blocked by colliding with an obstacle or the like, the drive motor M is immediately stopped.

(2) When the door mirror rotates from the retracted position to the standing position; the switch circuit 2 is operated to perform the standing operation. When the movable contacts 5 and 6 are brought into contact with the contact points B1 and B2, a charging current instantaneously flows through the capacitor C through the relay coil Rc from the contact point C2 in contact with the contact point B2. This charging current excites the relay coil Rc,
The relay contact Ra is closed and the power is turned on. Current is contact C2 → relay coil Rc → resistor R1 → relay contact Ra →
It flows with the contact C1 and holds the relay contact Ra by itself. In addition, current is contact C2 → resistance R3 → motor M → relay contact R
Then, the motor M starts rotating, and the door mirror starts rotating in the upright direction.

When the door mirror is mechanically stopped in the upright position by the rotation restricting means described later,
The rotation of the motor M is also stopped. By this rotation stop, the drive current of the motor M increases, and the voltage applied across the resistor R3 also increases accordingly. Then, when this voltage exceeds the forward voltage of the PN junction of the PNP transistor Q2, the transistor Q2 is turned on, that is, the current is conducted from the emitter side to the collector side. Then, due to this conduction, the voltage across the relay coil Rc becomes substantially zero, so that no current flows in the relay coil Rc,
Excitation is released. Along with this, the self-holding by the relay contact Ra is released, the power supply to the drive motor M is stopped, and the drive motor M is stopped. In addition, as in the case of storage described above, even if the door mirror collides with an obstacle or the like and stops, the current supply is stopped immediately when rotation is blocked, and control is performed so that no more force is applied. To be done.

As a result of earnest studies by the inventor, the temperature range-
When the time from when the mirror body was physically stopped until the motor drive current was cut off was measured in a wide range of conditions from 30 ° C to 80 ° C and a power supply voltage range of 8V to 16V, it was stably within 100 msec. It was confirmed that the drive motor M was instantaneously stopped. Next, an electric retractable door mirror using the control device 1 will be described. In the electric retractable door mirror, a shaft is erected on a protruding portion of a base fixed to a vehicle door panel or a triangular window, a clutch gear and a spring are fitted and inserted on a frame fitted to the shaft, and the spring is pressed by a washer. After that, fix the washer to the shaft. The clutch gear is adapted to mesh with a pinion gear which is rotated by a motor built in the mirror body via a speed reduction mechanism, and the mirror body is rotated about the shaft by driving the motor.

FIG. 2 is a partial sectional view of the electric retractable door mirror used in the embodiment of the present invention. The electric retractable door mirror is configured by fitting a shaft member 10 having a shaft portion 11 and a frame 15 to which a mirror (not shown) and a plate outer (shaft cover) 30 are attached. A predetermined height h is provided at the bottom of the frame 15.
, A ring-shaped frame groove 17 and an arc-shaped groove 31 provided coaxially with the shaft portion 11 of the shaft member 10, and the plate stopper 14 is fixed. Also, the sliding portion S abuts and slides on the shaft member 10, the convex shaft rib 16 that loosely fits into the frame groove 17, and the loosely fits into the arc-shaped groove 31. A hole 12 having a hemispherical cross-sectional shape in which a shaft stopper 32 and a ball 13 are buried in contact with the side wall is provided.

Further, the shaft member 10 includes a shaft portion 11
A gear 18 (driving means) which is movable in the axial direction and whose rotation is restricted is provided, and a gear 19 (driving means) fixed to the frame 15 is meshed with the gear 18. Then, the ball 22 guided by the ball guide 21 comes into contact with the gear 18, and the ball 22 is attached to the washer lower 2
A spring 26 is urged downwardly (in the direction of the ball 13) via 3. The other end of the spring 26 is regulated by the washer upper 25 and the plate 27. FIG. 3 is a perspective view of the plate stopper 14 drawn with the surface on which the ball 13 is located as an upper surface.
Two pairs of concave and convex portions having 4b are provided symmetrically to form an H surface (convex portion) and an L surface (concave portion).

The positioning mechanism in the electric retractable door mirror having the above structure will be described in detail. FIG. 4 shows the shaft member 1
0, the ball 13, and the plate stopper 14 are partially sectional views developed along the annular plate stopper 14 for explaining the contact relationship, and FIG. 4A shows a state in which the mirror is positioned at the upright position, FIG.4 (b) has shown the state located in the storage position.

When the motor M is driven, the gear 19 rotates, and the gear 18 meshing with this rotates. However, as described above, since the gear 18 is fixed around the axis of the shaft 11, the gear 19 fixed to the frame 15 rotates around the shaft 11 with the frame 15. When the mirror faces the upright position, the step 14a of the plate stopper 14, which is the rotation restricting means at the upright position, comes into contact with the ball 13 to mechanically stop the rotation of the motor. As described above, the control device cuts off the power supply to the motor due to the drive current increased by the stop of the rotation.

When the mirror faces the storage position, the shaft stopper 32, which is a rotation restricting means at the storage position, abuts the groove end of the arc-shaped groove 31 (step of the groove),
The rotation of the motor M is mechanically stopped, and the control device operates to cut off the power supply. Further, when the mirror position is moved from the regulation position by the external force, the ball 13 moves the step 14
It rides over a and slides on the H surface of the plate stopper 14. At that time, the driver turns on the switch of the control device to either A1, A2 or B1, B2 so that the mirror position becomes the correct position.

FIG. 5 is a circuit diagram showing the configuration of a door mirror control device according to the second embodiment of the present invention. In this embodiment, a capacitor Ca for integration is further inserted between the resistor R2 and the contact C2 in the circuit diagram of the above embodiment, and the capacitor Ca and the resistor R2 form an integrating circuit. Is forming. In other words, this integration circuit operates to accumulate electric charges according to the voltage applied to the resistor R3 in the capacitor Ca, and to make the transistors Q1 and Q2 conductive when the accumulated electric charge amount exceeds a predetermined value. According to such a configuration, as compared with the above-described embodiment, a time delay occurs until each of the transistors Q1 and Q2 becomes conductive, so that when the transient current at power-on is large, the transistor Q1 , Q2 operate to prevent the release of the self-holding of the relay coil Rc.

[0026]

As described above, according to the controller for the electric retractable door mirror of the present invention, when the drive motor is overloaded and the drive current is increased, the resistance of the resistor connected between the switch circuit and the motor is reduced. Since the rotation of the drive motor is stopped by detecting the increase in the voltage generated at both ends, complicated work such as aligning the mirror body upright position or the circuit switching position at the storage position is unnecessary, and the motor drive Since both the current detecting portion and the contact portion of the relay for controlling the drive current are hermetically sealed in the package, there is no risk of malfunction such as poor contact due to foreign matter.

When the drive motor is overloaded, the power supply to the drive circuit is instantaneously cut off without a time lag, so that the mirror body does not move beyond the regulated position, the positional accuracy is improved, and the motor is prevented from being burned. . As a result, the durability of the components is improved without imposing a load on the drive system, or an abnormal current is not generated because an overcurrent does not continuously flow in the circuit system. In addition, even when the rotation is forcibly stopped by an external obstacle during the rotation of the mirror, the driving current of the motor is instantaneously cut off, so that the safety is improved.
Since the transistor is driven by increasing the voltage applied to both ends of the voltage dividing resistor, it is no longer affected by dust and dirt around the transistor.

Furthermore, two transistors (PNP type, N
Since the PN type) is used, the number of parts is small, the circuit is simple, and the size is small, so that it can be incorporated in the mirror housing, and in addition, it can be manufactured at low cost. As a result, the quality and reliability of the electric retractable door mirror can be improved, the door mirror can be made smaller and its capacity can be reduced by a simple and small circuit, and the safety during operation of the door mirror can be improved and it can be made at low cost. It has become possible to provide a control device for an electric retractable door mirror.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a configuration of a door mirror control device according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional view of a rotating portion of an electric retractable door mirror to which the present invention is applied.

FIG. 3 is a perspective view of a plate stopper used in FIG.

FIG. 4 is a development view for explaining a contact state with a plate stopper, a ball, and a shaft, in which (a) is a standing position,
(B) shows the storage position.

FIG. 5 is a circuit diagram showing a configuration of a door mirror control device according to a second embodiment of the present invention.

FIG. 6 is an exploded perspective view showing a fitted state of a frame and a shaft of a conventional electric retractable door mirror.

FIG. 7 is a plan view showing a state of rotation restriction when the mirror body is in the standing position in FIG.

FIG. 8 is a plan view showing the state of rotation restriction when the mirror body is in the storage position in FIG.

[Explanation of symbols]

 1 Door mirror control circuit 2 Switch circuit (polarity switching circuit) 3 Relay circuit 4 Relay control circuit 5, 6 Moving contact 10 Shaft member 11 Shaft part 12 Hole 13 Ball 14 Plate stopper 15 Frame 16 Shaft rib 17 Frame groove 18 Gear 19 Gear 21 Ball Guide 22 Ball 23 Washer Lower 25 Washer Upper 26 Spring 27 Locking Plate 30 Plate Outer 31 Arcuate Groove 32 Shaft Stopper E Power Supply M Drive Motor Q1 NPN Transistor Q2 PNP Transistor R1, R2, R3 Resistance

Claims (3)

[Claims] 1. A controller for an electric retractable door mirror that rotates a drive motor mounted on a vehicle door mirror in a forward or reverse direction to rotate the door mirror to an upright position or a retracted position, wherein a DC power source, an on / off switch, A series circuit having a drive motor and a voltage-dividing resistor connected in series, both ends of which are connected to the DC power supply; a polarity switching circuit that switches the polarity of the connection between the DC power supply and the series circuit; When the power supply to the series circuit is turned on, the starting capacitor that accumulates electric charge and the current that flows when the electric charge is accumulated in the starting capacitor are excited, and the on / off switch is turned on and the on / off switch is turned on. When the voltage applied to the voltage dividing resistor exceeds the specified value, the relay is self-held by turning on and conducts, bypassing both ends of the relay. To make the current value flowing through the relay zero or minute, respectively,
An electric retractable door mirror control device comprising: an NPN-type transistor and a PNP-type transistor whose collectors are connected to both ends of the relay. 2. A control device for an electric retractable door mirror that rotates a drive motor mounted on a vehicle door mirror in a normal or reverse direction to rotate the door mirror to an upright position and a retracted position, wherein a direct current power source, an on / off switch, A series circuit having a drive motor and a voltage-dividing resistor connected in series, both ends of which are connected to the DC power supply; a polarity switching circuit that switches the polarity of the connection between the DC power supply and the series circuit; When the power supply to the series circuit is turned on, the starting capacitor that accumulates electric charge and the current that flows when the electric charge is accumulated in the starting capacitor are excited, and the on / off switch is turned on and the on / off switch is turned on. A relay that is self-held by turning on, an integrating circuit that integrates the voltage across the voltage dividing resistor, and when the integrated value of the integrating circuit exceeds a predetermined value. It is conducting,
An electrically retractable storage device comprising: an NPN type transistor and a PNP type transistor, each of which has an emitter and a collector connected to both ends of the relay and which bypasses both ends of the relay and makes a current value flowing through the relay zero or minute. Door mirror control device. 3. The integrator circuit is configured by connecting a resistor and an integrating capacitor in series, and a connecting portion between the resistor and the integrating capacitor, the NPN transistor and the PN.
The control device for the electric retractable door mirror according to claim 2, wherein the base of the P-type transistor is connected.