JPH09107691A - Door-mirror controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a door-mirror controller which can shorten the time in which a lock current flows to a motor. SOLUTION: When a door mirror is turned and controlled to a housing position and a usage position, a lock current which flows to a motor 18 is detected by a resistance 19. A transistor 22 or a transistor 23 at a relay control circuit 29 is turned on according to the polarity of the current. A coil 15e at a latch relay 15 is electrified. A moving contact 15b at the latch relay 15 is changed over to the side of a fixed contact 15c or to the side of a contact 15d. The drive of the motor 18 is stopped. A current route is changed over to the polarity of a current by which an operating switch 10 is operated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door mirror controller for alternately rotating a door mirror installed on a door of a vehicle between a storage position and a use position by driving a motor.

[0002]

2. Description of the Related Art An example of a door mirror controller for controlling a door mirror of a vehicle such as an automobile is shown in FIG. In FIG. 2 showing the electrical configuration, the motor (DC motor) 1 is
One terminal thereof is connected to the movable contact 4a of the changeover switch 4 in the operation switch 3 through the normally open contact 2a of the relay 2, and the other terminal is connected to the PTC (positive temperature coefficient thermistor) 5
Is connected to the movable contact 6a of the changeover switch 6 in the operation switch 3. In addition, the movable contact 4a of the changeover switch 4 includes a starting capacitor 7 and a relay 2
The motor 1 and the PTC 5 via the series circuit with the coil 2b of
And a resistor 8 connected in parallel to a series circuit of the normally open contact 2a and the capacitor 7.

The ACC (accessory) power supply terminal 9 is supplied with power from a battery when a key rotary switch (not shown) is operated to the ACC position, and is connected to fixed contacts 4b and 6c of the changeover switches 4 and 6. Has been done. Then, the fixed contacts 4 of the changeover switches 4 and 6
c and 6b are grounded.

For example, if the driver operates the operation switch 3 and connects the movable contacts 4a and 6a of the operation switch 3 to the fixed contacts 4b and 6b, the ACC power supply terminal 9 and the contacts 4b, 4a of the changeover switch 4 are connected. A current flows through the capacitor 7, the coil 2b, the PTC 5, the contacts 6a and 6b of the changeover switch 6 and the coil 2b through the earth path, and the normally open contact 2a of the relay 2 is closed.

As a result, the ACC power supply terminal 9, the contacts 4b and 4a of the changeover switch 4, the normally open contact 2a of the relay 2,
Motor 1, PTC 5, contact 6a, 6 of changeover switch 6
A current in the direction of arrow A flows through the motor 1 in the path of b and the ground, and the motor 1 rotates in the forward direction, so that the door mirror (neither is shown) is passed through the drive mechanism connected to the rotation shaft of the motor 1. ), For example, from the storage position folded so that the mirror surface is substantially parallel to the door plane of the car,
The mirror surface is rotated so as to reach a use position in which the mirror surface is substantially vertical to the door plane. Then, once the normally open contact 2a is closed, the coil 2b is energized via the resistor 8 thereafter, so that the normally open contact 2a remains closed.

When the door mirror is rotated to the use position, the motor 1 is locked and a lock current flows in the direction of arrow A. Then, the temperature of the PTC 5 rises, and after 1.5 to 2 seconds, the Curie point is reached and the resistance value rapidly rises, which is a so-called trip state, and the voltage across the PTC 5 rises. As a result, the voltage across the coil 2b of the relay 2 drops, so the normally open contact 2a is opened,
The driving of the motor 1 is stopped.

[0007]

However, in such a conventional door mirror controller, since the PTC 5 trips every time the door mirror is rotated, the PTC 5 is required to have high durability. Further, since the lock current flows for a relatively long time each time, stress is applied to the mechanical elements such as the circuit element, the motor 1 and the drive mechanism section, and the burden is increased, which shortens the life of these elements. The present invention solves the above problems, and an object thereof is to provide a door mirror controller that can shorten the time during which a lock current flows.

[0008]

In order to achieve the above object, a door mirror controller of the present invention rotates a door mirror installed on a door of a vehicle alternately between a storage position and a use position by driving a motor. In the control, the operation switch that alternately switches the polarity of the current flowing through the motor, the current detecting means that detects the lock current flowing through the motor, and the coil is excited every time the lock current is detected by this current detecting means. By switching the contact, the driving of the motor is stopped, and a latch relay that switches the path of the current flowing through the motor to the polarity at which the operation switch is operated next is provided.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG. The operation switch 10 includes two changeover switches 11 and 12, and fixed contacts 11a and 12b of the two changeover switches 11 and 12
Is connected to the ACC power supply terminal 13 and has a fixed contact 1
1b and 12a are connected to the ground 14. The movable contact 11c of the changeover switch 11 is connected to the movable contact 15b of the changeover type relay switch 15a of the latch relay 15, and the fixed contacts 15c and 15d of the relay switch 15a are the anode of the diode 16 and the diode 17 respectively. Each is connected to the cathode.

The cathode of the diode 16 and the anode of the diode 17 are connected to one terminal of a motor (DC motor) 18. The other terminal of the motor 18 is connected to a movable contact 12c of the changeover switch 12 via a series circuit of a resistor 19 and a PTC 20 which are current detecting means. In addition, the movable contact 15b of the relay switch 15a
Is the coil 15e of the latch relay 15 and the diode 2
It is connected to the collector of an NPN-type transistor 22 via a series circuit of 1, and the emitter of the transistor 22 is connected to a common connection point of the resistor 19 and the PTC 20.

An emitter of a PNP type transistor 23 is connected to a common connection point of the resistor 19 and the PTC 20, and a collector of the transistor 23 is connected to the diode 2.
It is connected to the common connection point of the coil 15 e and the diode 21 via the line 4. The base of the transistor 23 is connected to the motor 1 via a series circuit of a diode 25 and a resistor 26.
8 and the resistor 19 are connected to each other, and the common connection point of the diode 25 and the resistor 26 is connected to the capacitor 27.
It is connected to the common connection point of the resistor 19 and the PTC 20 via the, and is also connected to the base of the transistor 22 via the diode 28. The circuit related to the transistors 22 and 23 constitutes a relay control circuit 29 which is a relay control means. In the present embodiment, PT
C20 is added to handle a case where an overcurrent occurs due to an abnormal state.

Next, the operation of this embodiment will be described.
First, from the case where the door mirror (not shown) is in the storage position,
It is assumed that the operation switch 10 is operated and the changeover switches 11 and 12 are brought into the state shown in FIG. Then ACC
Power supply terminal 13 and contacts 11a and 11 of the changeover switch 11
c, the contacts 15b and 15c of the relay switch 15a, the diode 16, the motor 18, the resistor 19, the PTC 20, the contacts 12c and 12a of the changeover switch 12 and the ground 14 and a current in the direction of arrow A flows through the motor 18, so that the motor 1
When the motor 8 rotates in the forward direction, the motor 18 rotates the door mirror through the rear part of the driving machine in the direction to reach the use position.

At this time, the base potential of the transistor 22 is substantially equal to the potential at which the capacitor 27 is charged through the resistor 26 by the voltage across the resistor 19, that is, the voltage across the resistor 19, and the transistor 22 is normally rotated. 22
Each circuit constant is set so that is turned off.

When the door mirror is in the use position,
When the motor 18 locks, a lock current flows in the direction of the arrow A. Then, as the voltage across the resistor 19 rises, the base potential of the transistor 22 also rises, and the transistor 22 is turned on. Therefore, when the collector current flows through the transistor 22, the coil 15e of the latch relay 15 is energized and excited, and the movable contact 15b is moved within a few tens of milliseconds (PTC
Before the 20 trips), the fixed contact 15c side is switched to the fixed contact 15d side. Then, the energization path to the motor 18 is cut off and the driving of the motor 18 is stopped.

Next, the operation switch 10 is operated from this state, and the movable contacts 11 of the changeover switches 11 and 12 are operated.
It is assumed that c and 12c are switched to the fixed contacts 11b and 12b side. Then, this time, the ACC power supply terminal 13, the contacts 12b and 12c of the changeover switch 12, the PTC 20, the resistor 19, the motor 18, the diode 17, the relay switch 1
A current flows through the motor 18 in the direction of the arrow B opposite to the direction of the arrow A in the path of the contacts 15d and 15b of 5a, the contacts 11c and 11b of the changeover switch 11 and the earth 14, and the motor 18 is rotated in reverse to be used. The door mirror at the position is rotated in the direction to the retracted position.

At this time, since the voltage across the resistor 19 is low, the potential at the common connection point of the resistor 19 and the motor 18 is high, and the base potential of the transistor 23 is also high, so the transistor 23 is in the off state.

When the door mirror is in the storage position,
When the motor 18 locks in the same manner as described above, a lock current flows in the direction of the arrow B. Then the resistance 19
The base voltage of the transistor 23 is relatively decreased by the increase of the voltage across the transistor 23, and the transistor 23 is turned on. As a result, a collector current flows through the transistor 23, the coil 15e of the latch relay 15 is energized and excited, and the movable contact 15b is switched from the fixed contact 15d side to the fixed contact 15c side before the PTC 20 trips. Then, the energization path to the motor 18 is cut off and the driving of the motor 18 is stopped.

The changeover switch 1 of the operation switch 10
1 and 12 are contacts 11c, 1 as shown by the solid line in FIG.
1a and contacts 12c and 12a are closed,
Even when the door mirror is located between the storage position and the use position, when the power supply voltage of the battery is applied to the ACC power supply terminal 13, a current flows in the motor 18 in the arrow A direction or the arrow B direction. Then, the operation as described above is performed.

As described above, according to the present embodiment, when the door mirror is controlled to rotate between the storage position and the use position, the lock current flowing through the motor 18 is detected by the resistor 19, so that the relay control circuit 29 operates. Based on the action, the transistor 22 or the transistor 23 is turned on according to the polarity of the current, the coil 15e of the latch relay 15 is energized, and the movable contact 15b of the latch relay 15 is switched to the fixed contact 15c side or 15d side. The drive of the motor 18 is stopped, and the current path is switched to the polarity of the current at which the operation switch 10 is operated next.

Therefore, unlike the prior art, it is not necessary to trip the PTC 20 each time the door mirror is rotated,
Since the time period during which the lock current flows can be extremely shortened, high durability is not required for the PTC 20, and stress applied to mechanical elements such as the motor 18 and other drive mechanisms and circuit elements are also reduced. It is possible to extend the life of these.

The present invention is not limited to the embodiment described above and shown in the drawings. For example, PTC2
0 may be provided as necessary, and various modifications may be made without departing from the scope of the invention.

[0022]

As described above, according to the door mirror controller of the present invention, in the latch relay, the coil is excited and the contact is switched every time the lock current flowing to the motor is detected by the current detecting means. , The drive of the motor is stopped, and the path of the current flowing through the motor is switched to the polarity at which the operation switch is operated next, so the time during which the lock current flows can be extremely shortened, and the mechanical element and each circuit element can be shortened. The stress given to them can be reduced and their lifespan can be extended.

[Brief description of the drawings]

FIG. 1 is an electrical configuration diagram showing one embodiment of the present invention.

FIG. 2 is a view corresponding to FIG. 1 showing a conventional technique.

[Explanation of symbols]

10 is an operation switch, 11 and 12 are changeover switches,
15 is a latch relay, 15a is a relay switch, 15e
Is a coil, 18 is a motor, 19 is a resistance (current detecting means), 20 is a PTC, and 29 is a relay control circuit.

Claims (1)

[Claims] 1. A door mirror installed on a vehicle door,
In a door mirror controller that alternately controls the rotation of a motor between a storage position and a use position by driving a motor, an operation switch that alternately switches the polarity of a current flowing through the motor, and a current detection unit that detects a lock current flowing through the motor. Each time the lock current is detected by the current detecting means, the coil is excited and the contact is switched to stop the driving of the motor, and the operation switch switches the path of the current flowing through the motor to the next. A door mirror controller, comprising: a latch relay that switches to a polarity that can be operated by.