JPH02164631A - Controller for automotive door mirror - Google Patents

Abstract

PURPOSE:To reduce the cost by composing a control circuit of a reduced number of relays for controlling a door mirror, when it is at a middle position between a first and a second position, to be rotated to either one position by priority. CONSTITUTION:A drive unit 6, 17 for driving a door mirror rotates the door mirror between a first position (storing position) and a second position (usage position) corresponding to normal/reverse rotation of a motor 7, and a first and a second position detecting switches 8, 9 are provided. A dashboard has an automatic restore type operation switch 20, and one end of it is connected with a terminal T9 of a control circuit unit 16. This control circuit unit 6 is composed having holding circuit 38 for holding either of transistors 26, 29 on, when either of a first and a second relay 21, 22, which are energized through the transistors 26, 29 when the switch 8, 9 is on, is operated, corresponding to the relay in operation.

Description

Detailed Description of the Invention [Objective of the Invention] (Industrial Application!!'f) The present invention provides a method for reciprocating the door mirror of an automobile between a first position and a second position by remote control. The present invention relates to a control device for an automobile mirror that can be controlled.

(Prior Art) In automobiles, the use of door mirrors as outside mirrors is becoming widespread, but when parking the car, the door mirrors that protrude from the door become a nuisance. This is often the case. For this reason, conventionally, door mirrors have been constructed so that they can be rotated back and forth between a use position in which they protrude in a direction substantially perpendicular to the door and a retracted position in which they are substantially parallel to the door. ing.

In particular, in recent years, with the trend toward higher quality automobiles and higher load value, devices have been provided that allow door mirrors to be selectively rotated between a use position and a storage position by remote control. When configuring this type of equipment, typically
By switching the direction of energization of a motor for rotating the door mirror back and forth, the rotation of the door mirror to the use position and storage position is selected. and,
Relays are generally used for such switching, but it is desirable that the number of relays be as small as possible. For this reason, conventionally, a control device for an automobile door mirror has been provided in which two relays are used to switch the energizing direction of the door mirror rotation motor, and this device has a general configuration as described below. There is.

That is, in addition to the first relay and the second relay, this device is provided with a storage position detection switch and a usage position detection switch for detecting the valley state in which the door mirror is in the storage position and the usage position. In this case, the storage position detection switch is in an off state only when the door mirror is in the storage position and is in an on state in other states, and the use position detection switch is in an off state only when the door mirror is in the use position. It is configured to be in the on state in other states. Additionally, the door mirror rotates toward the retracted position when the motor rotates forward, and
is configured to rotate toward the use position when the holder is rotated in the opposite direction. When the first relay is operated, a current-carrying path for forward rotation of the motor is connected via the storage position detection switch, and when the second relay is operated, the motor is They are connected so that a reverse (11) diversion current path is formed via a use position detection switch.

Therefore, when the first relay operates with the door mirror in the use position, that is, with the storage position detection switch turned on, an energizing path for forward rotation of the motor is formed via the storage position detection switch. In response to this, the door mirror is rotated toward the retracted position. When the door mirror reaches the retracted position in response to such rotation, the retracted position detection switch is turned off, the motor is cut off, and the rotation of the door mirror is stopped. In addition, when the second relay operates with the door mirror in the retracted position, that is, with the use position detection switch turned on, an energization path for reverse rotation of the motor is formed via the use position detection switch. Accordingly, the door mirror is rotated toward the use position. When the door mirror reaches the use position in response to such rotation, the use position detection switch is turned off, the motor is cut off, and the rotation of the door mirror is stopped.

On the other hand, the operation switching of the first and second relays as described above is performed by a control circuit, and this control circuit is a flip-flop that inverts the output every time an automatic return type operation switch is turned on. The output of the flip-flop is used to selectively operate either the first or second relay. That is, each time the operation switch is turned on, the first relay and the second relay are operated alternately.

(Problems to be Solved by the Invention) In the above conventional configuration, in each state where the door mirror is in the use position or the storage position, the door mirror is intentionally rotated to the storage position or the use position in response to the ON operation of the operation switch. can be done. However, when the operation switch is turned on while the door mirror is in the middle of the use position and the storage position, it is unknown whether the first relay or the second relay will be activated. There was a risk of causing problems such as being rotated in a direction and colliding with an obstacle. In order to deal with such problems, at least two additional relays are installed, and when the operation switch is turned on with the door mirror in the intermediate position as described above, the door mirror is given priority to the retracted position, for example. It is being considered to have a circuit configuration that allows rotation.

However, this configuration requires a total of four or more relays, which brings about new problems such as an increase in the size and cost of the entire device.

The present invention has been made in view of the above circumstances, and an object of the present invention is to enable the door mirror to be selectively automatically rotated to the first position and the second position, and to rotate the door mirror between the above-mentioned positions. It is possible to preferentially rotate the door mirror to one of the positions when the position is in the same position, and the number of relays required for the above-mentioned simultaneous movement function can be kept to two, which reduces the overall size. An object of the present invention is to provide a control device for a door mirror for an automobile, which can reduce costs and reduce costs.

[Fourth aspect of the invention] (Means for solving the problem) In order to achieve the above object, the present invention rotates a door mirror toward the first position when the door mirror is rotated in the forward direction, and when the door mirror is rotated in the reverse direction. a drive motor for rotating the door mirror in the direction of the second position;
a second position detection switch having an internal contact that is ON only when the door mirror is in the first position and between the first position and the second position; an automatic return type operation switch that outputs a rotation command signal in response to the rotation command signal; first and second switching elements connected to be turned on when the rotation command signal is output; and the first position detection switch. When the rotation command signal is output with the rotation command signal turned on, the second
a blocking circuit that prevents the switching element from turning on, and is energized through the first position detection switch when the first switching element is turned on with the first position detection switch turned on; a first relay that operates, and a second relay that operates by being energized via the second position detection switch when the second switching element is turned on with the second position detection switch turned on; , and a holding circuit that holds one of the first and second switching elements corresponding to the relay in the operating state in an on state when either of the first and second relays is operated. In addition, when the first relay is operated, an energizing path for causing the drive motor to rotate in the forward direction connects the second position detection switch or a first diode connected in parallel with the second position detection switch, the drive motor, and the first diode. A second diode interposed between the position detection switches and the first position detection switch are connected in series, and when the second relay is operated, the drive motor A third diode that bypasses the first position detection switch and the second position detection switch are connected in series so that an energization path for reversely rotating the position detection switch is formed.

In addition, the configuration of the second relay described above is changed to operate independently of the second position detection switch when the second switching element is turned on, and when a certain period of time has elapsed after the output of the rotation command signal. In some cases, a timer circuit may be additionally provided to initialize the holding operation by the holding circuit.

(Operation) When the door mirror is in the second position, the internal contact of the first position detection switch is turned on, and the internal contact of the second position detection switch is turned off. In this state, when a synchronization command signal is output in response to an on operation of the operation switch, the blocking circuit prevents the second switching element from turning on, so only the first switching element is turned on. . As a result, the first relay
The current is activated via the position detection switch, and the holding circuit holds the first switching element in the on state in response to the operation of the first relay. Even after the output of the rotation command signal is stopped in response to turning off the operation switch, the operating state of the first relay is maintained. Therefore, in a state in which the first relay is operated in this way, the current-carrying path that causes the drive motor to rotate forward is connected to the second position detection switch or the first diode connected in parallel with the second position detection switch, and the drive motor and the first diode connected in parallel. a second diode interposed between the first position detection switch;
The door mirror is connected in series with the first position detection switch, and the door mirror is rotated toward the first position accordingly. When the door mirror is rotated to the first position by such rotation, the first position detection switch is turned off, so the first relay is cut off and stops operating, and the drive motor is accordingly turned off. The energizing path is cut off and the door mirror is stopped at the first position.

Further, when the door mirror is in the first position, the internal contact of the first position detection switch is turned off, and the internal contact of the second position detection switch is turned on. In this state, when the rotation command signal is output in response to the on operation of the operation switch, the first and second switching elements are turned on. The relay is energized via the second position detection switch. In addition, in response to the operation of the second relay, the holding circuit holds the second switching element in the on state, so that the output of the rotation command signal is stopped in response to the operation switch being turned off. When this happens, only the first switching element is turned off. Therefore, in the state in which the second relay is operated in this way, the current-carrying path that reversely rotates the drive motor connects the third diode that bypasses the first position detection switch and the second position detection switch. The door mirrors are formed in series, and the door mirrors are rotated toward the second position accordingly.

When the door mirror is rotated to the second position by such rotation, the second position detection switch is turned off.
The second relay is de-energized and stops operating, and in response, the energizing path of the drive motor is cut off and the door mirror is stopped at the second position.

When the door mirror is located between the first position and the second position, both the internal contact of the first position detection switch and the internal contact of the second position detection switch are turned on. In this state, when a rotation command signal is output in response to the on operation of the operation switch,
The blocking circuit functions and only the first switching element is turned on.

As a result, the door mirror is rotated to the first position and stopped, similar to the case where the door mirror is in the first position. That is, when rotation command f+a is output with the door mirror in a position other than the first position, that door mirror is rotated preferentially to the first position.

On the other hand, when the configuration of the first relay is changed and a timer circuit is additionally provided, the second relay is activated when the second switching element is turned on in response to the output of the rotation command signal. The second position detection switch is operated regardless of whether the second position detection switch is on or off.

However, when the first position detection switch is turned on,
The blocking circuit functions to prevent the second switching element from turning on11. , so the second relay is never activated. Therefore, as described above, the door mirror is preferentially rotated to the first position.

In this case, the operation of the first relay F is stopped in response to the timer circuit initializing the holding function of the holding circuit.

(Example) Hereinafter, a first example of the present invention will be described with reference to FIGS. 1 to 3.

First, in FIG. 3 showing a schematic top view for automatic use,
Right and left side door mirrors 4 and 5, which are outer mirrors, are provided at the front ends of the right and left doors 2 and 3 of the automatic center 1, respectively. These door mirrors 4 and 5 are located at a first storage position, approximately 14 rows apart from the doors 2 and 3, as shown by the two-dot chain line, and at a position approximately perpendicular to the doors 2 and 3, as shown by the solid line. It is possible to reciprocate and rotate between the second position, which is the use position, in which it protrudes in the direction of
Further, as shown by the broken line, it can also be rotated to a forward position further forward than the above-mentioned use position.

FIG. 1 shows the electrical configuration of a control device for controlling the rotation of the door mirrors 4 and 5, and this will be explained below.

That is, 6 is a right side drive unit for driving the right side door mirror 4, and this includes a drive motor 7 made of, for example, a DC motor, a storage position detection switch 8, which is a first position detection switch. The device includes a use position detection switch 9, which is a second position detection switch, and first to fourth diodes 10 to 13. At this time, the drive motor 7 is disposed within the right side door mirror 4, and rotates the door mirror 4 back and forth in accordance with its forward and reverse rotation. Specifically, when current flows in the direction of arrow B, the drive motor 7 rotates forward to rotate the door mirror 4 toward the storage position, and when current flows in the direction of arrow B, it rotates in the reverse direction to rotate the door mirror 4. 4 in the direction of the forward position (direction of the use position). Storage position detection switch 8
H is an internal contact that is turned off only when the door mirror 4 is in the retracted position;
The switch is configured to be in an on state when the switch is in a position other than the storage position. The use position detection switch 9 also has fixed contacts S, C and IIJ moving contacts C as internal contacts, and when the door mirror 4 is in the storage position and between the storage position and the use position, the contact (C -a), and is configured to be on at other times between contacts (c and b). Incidentally, FIG. 2 shows the on/off states of the storage position detection switch 8 and the use position detection switch 9.

In the right drive unit 6, the above-mentioned components are connected as follows. That is, the drive motor 7 has one end connected to the first diode 10 in the illustrated polarity state and the contact point (c-a) of the use position detection switch 9.
The other end is connected to the second power line 14b through the second diode 11 and the storage position detection switch 8 in series, each having the polarity shown. Further, a third diode 12 having the illustrated polarity is connected between the second power supply line 14b and one end of the drive motor 7 so as to bypass the storage position detection switch 8 and the second diode 11.

The fourth diode 13 is connected to the second power supply line 14b.
and the fixed contact of the use position detection switch 9 in the illustrated polarity state. Furthermore, the storage position detection switch 8
and a common connection point of the second diode 11 is connected to a terminal TI of the control circuit unit 16 via a signal line 15a,
A movable contact C of the use position detection switch 9 is connected to a terminal T2 of the control circuit unit 16 via a signal line 15b.

Note that the first power line 14a and the second power line 14b are connected to terminals T3 and T4 of the control circuit unit 16, respectively.

Reference numeral 17 denotes a mirror drive unit for driving the left side door mirror 5, and since this has the same configuration as the mirror drive unit 6 for the right side door mirror 4 described above, its illustration is omitted. Note that the mirror drive unit 17 is connected to the terminal T5. of the control circuit unit 16. It is connected to the TO via signal lines 18a and 18b similarly to the mirror drive unit 6, and is connected to the terminal T of the 1.1 circuit unit 16.
7° First power line 19a, second power line 19 for T8
connected via b.

Reference numeral 20 denotes an operation switch provided, for example, on the dash board of an automobile, and is constructed to be an automatic return type that turns on only when externally operated.

One end of the operation switch 20 is connected to the terminal T9 of the control circuit unit 6, and the other end is connected to the control terminal 7+B of the battery via the accessory terminal ACC and an accessory switch (not shown). It is connected. As a result of this connection, every time the operation switch 20 is turned on, a rotation command signal Sa consisting of a high level signal is sent to the terminal T9.

However, '1. (The J i1 circuit unit 16 is configured to receive power from the power terminal TIO connected to the positive terminal 1B of the battery and the ground terminal Tl1 which is externally earthed.The internal circuit configuration of this unit will be explained below. do.

That is, 21 is a relay switch 21a and an exciting coil 21
The first relay 22 with b set to (-f) is a second relay having a relay switch 22a and an excitation coil 22b.In this case, the relay switches 21a and 22'a
In this case, each normally open contact NO is connected to a power supply terminal TIO, and each normally closed contact NC is connected to a ground terminal (actually, ground terminal T11). Further, the common contact C of one relay switch 21a is connected to the terminal T3. T
7, and the common contact C of the other relay switch 22a is connected to terminal T4. Connected to T8. Excitation coil 2
One end of 1b is branched into two after passing through a diode 23 in the forward direction, and each branch end is connected to terminals TI and T5 through diodes 24 and 25 in the forward direction, respectively. The other end of the excitation coil 21b is connected to the collector of a pnp transistor 26, which is a first switching element.

Each excitation coil 22b has a diode 27 at one end.
+28 in the forward direction to end T-T2. It is connected to TO, and the other end is connected to the collector of a pnp transistor 29, which is a second switching element.

The first transistor 26 has a resistor 30 connected between its emitter and base, the emitter is connected to the power supply terminal TIO, and the base is connected to the collector of the npn transistor 31 with a resistor 32 and a diode with the polarity shown. 33 are connected in series. The transistor 29 also has a resistor 3 between its emitter and base.
4 is connected, and the emitter is connected to the power supply terminal TIO.
The base is further connected to the collector of an npn transistor 35 via a resistor 36 and a diode 37 having the polarity shown in the drawing.

The transistors 31 and 35 form part of a holding circuit 38, and this holding circuit 38 has the following configuration. That is, while connecting resistors 39° and 40 between the emitter and base of each transistor 31 and 35,
Each emitter is connected to each other. A series circuit of a resistor 41 and a diode 42 having the illustrated polarity is connected between the common terminal TC of the relay switch 21a and the base of the transistor 31, and the relay switch 22a is
between the common terminal C of the transistor 35 and the base of the transistor 35,
A series circuit of a resistor 43 and a diode 44 of the illustrated polarity is connected.

Point P in FIG. 1 receives the rotation command signal Sa applied to the terminal T9 via the diode 45, and this point P is connected to the base of the transistor 31 in the holding circuit 38. , and is connected to the base of the other transistor 35 in the holding circuit 38 via a resistor 46 and a diode 47 of the polarity shown in the figure.
They are connected via resistors 48, 49 and diodes 50 of the polarity shown.

Reference numeral 51 denotes a timer circuit that is activated when receiving the rotation command signal Sa from the above-mentioned point P, and this has the following configuration and is set to 0. Ru. That is, this timer circuit 51 has a diode 52 . of the polarity shown between the point P and the ground terminal. A resistor 53 and a capacitor 54 as a timer element are connected in series,
Further, a constant voltage diode 55 is connected in parallel with the capacitor 54, and a series circuit of resistors 56 and 57 is also connected in parallel with the capacitor 54. The timer circuit 51 has an n p n-type transistor 58 at its output stage, and the base of this transistor 58 is connected to a resistor 56 . '57, the collector is connected to the emitter of the transistor 31.35 in the holding circuit 38, and the emitter is further connected to the ground terminal. Therefore, in the timer circuit 51, the capacitor 54 is charged as the potential at the point P rises due to the rotation command signal Sa, and the transistor 58 is charged.
is turned on. The timer circuit 51 starts a timer operation for a certain period of time when the capacitor 54 starts discharging when the output of the rotation command signal Sa stops, and during the timer operation period, the transistor 5
8 is kept on. Incidentally, the timer operation of the timer circuit 51 is newly performed each time the operation switch 20 is turned off from the on state.

5 is a blocking circuit which makes the diode 60 H and connects the anode of this diode 60 to the resistor 48.
49 and the cathode is connected to the common connection point of the diodes 23 and 24.

Next, the effect of the above configuration will be explained using the right side door mirror 4 as an example.

(1) When the door mirror 4 is in the use position (see the solid line in Figure 3), the forward position (see the broken line in Figure 3), or an intermediate position between these positions...In this state, from Figure 2 to As can be understood, the storage position detection switch 8 is in the on state, and the use position detection switch 9 is in contact (c-b)
It remains on for a while. In addition, when the rotation command signal Sa is not input to the terminal T9 of the control circuit unit 16, the first and second relays 21 and 22 are in a stopped state, and each relay switch 21a and 22a has a contact ( C
-NC) is on.

From this state, when the operation switch 2o is turned on and the rotation command signal Sa (high level signal) is sent to the terminal T9, the potential at point P rises, and in response, the transistor 58 in the timer circuit 51 is turned on. be done. At this time, the common connection point of the resistors 48 and 49 is connected to the diodes 60 and 24.
．． Since it is grounded to the ground level via the contacts (C-NO) of the storage position detection switch 8 and the relay switch 22a, the transistor 3 in the holding circuit 38
5 is never turned on, and transistor 31 is turned on. When the transistors 31 and 58 are turned on in this way, the transistor 26 is turned on, so that the excitation coil 21b of the relay 21 is connected to the power supply terminal TIO by the transistor 26, the diodes 23, 24 . Contact of storage position detection switch 8 and relay switch 22a (C-N
C), and the contact (C-No) of the relay switch 21a is turned on. Then, from the power supply terminal TIO, the contact of relay switch 2.1B (
NO-C), first diode 10° drive motor 7,
Second diode 11. An energizing path for normal rotation is formed between the contacts (C-NC) of the storage position detection switch 8 and the relay switch 22a to reach the ground terminal. As a result,
Since the drive motor 7 is energized in the direction of arrow A and rotates forward, the door mirror 4 starts rotating toward the retracted position. Further, after this rotation starts, even if the output of the rotation command signal Sa is stopped, the transistor 58 in the timer circuit 51 is kept in the ON state 17 during the timer operation period, and n
The transistor 31 in the holding circuit 31 also connects the common contact C of the relay switch 21a to the resistor 41. A base current is applied through the diode 42 to keep it in the on state.

Therefore, the transistor 26 is kept in the on state, and therefore, even after the operation switch 20 is turned off, the energization path for forward rotation of the drive motor 7 is maintained, and the rotation of the door mirror 4 in the direction of the retracted position is maintained. will continue.

In response to the rotation of the door mirror 4 as described above, this
When the storage position is rotated to the storage position shown by the two-dot chain line in the figure, the storage position detection switch 8 that detects this is turned off. Then, the energizing path of the excitation coil 21b is cut off, and the relay switch 21a returns to the OFF state between the contacts (C-NC), and accordingly, the energizing path for forward rotation of the drive motor 7 is cut off, and C1 The door mirror 4 is stopped at the retracted position.

In addition, as mentioned above, the relay switch 21a is a contact point (C-N
C) When the transistor 31 returns to the on state during
Since the supply of base current to the transistors 31 and 26 is stopped, transistors 31 and 26 are sequentially turned off. Furthermore, when a predetermined period of time has elapsed after the output of the rotation command signal Sa, the timer circuit 51 stops the timer operation and turns off the transistor 58, so that, for example, during the rotation of the door mirror, this becomes locked and the predetermined period of time elapses. When the time has elapsed, the transistors 31 and 26 turn off in response to the transistor 58 being turned off.
are sequentially turned off and the drive motor 7 is de-energized, thereby preventing the drive motor 7 from being continuously energized in a locked state.

1) When the door mirror 4 is in the retracted position (see the two-dot chain line in Fig. 3)... In this state, as can be understood from Fig. 2, the retracted position detection switch 8 is in the OFF state, and the door mirror 4 is not in use. The position detection switch 9 is in an on state between contacts (c and a). Also, terminal T
9, when the rotation command signal Sa is not input, each relay switch 21a,
22a is in a state where the contacts (C-NC) are turned on.

From this state, when the operation switch 20 is turned on,
The potential at point P rises, and in response, transistor 58 in timer circuit 51 is turned on.

In this case, the common connection point of the resistors 48 and 49 is
), the holding circuit 38 is not dropped to the ground level via the storage position detection switch 8 etc.
Inside, transistors 31 and 35 are both turned on, and accordingly, transistors 26 and 2 are turned on. At this time, the excitation coil 21b of the relay 21 is not energized because the storage position detection switch 8 is turned off, but the excitation coil 22b of the relay 22 is connected to the transistor 2 from the power terminal TIO.
1, diode 27. Contact point of use position detection switch 9 (
C-a) and relay switch 21a contact (C-NC
) becomes energized through relay switch 2
The contact (C-NO) of 2a is turned on. Then, from the power terminal TIO, the contact of the relay switch 22a (NO-
C) between the third diode 12. An energizing path for reverse rotation is formed which reaches the ground end T via the drive motor 7, the contacts (C-a) of the use position detection switch 9, and the contacts (C-NC) of the relay switch 21a. As a result, the drive motor 7 is energized in the direction of arrow B and reversely rotated, so that the door mirror 4 starts rotating toward the use position. Further, when the output of the rotation command signal Sa is stopped after this, the transistor 31 (and 26) is turned off, but the transistor 35 is connected to the common contact C of the relay switch 22a through the resistor 4.
A base current is applied through the 3° diode 44 to keep it in the on state. Therefore, the two transistors are kept in the on state, and therefore, even after the operation switch 20 is turned off, the energization path for reverse rotation of the drive motor 7 is maintained, thereby preventing the rotation of the door mirror 4 toward the use position. will continue.

In response to the rotation of the door mirror 4 as described above, this
When the device is rotated to the use position shown by the solid line in the figure, the use position detection switch 9 detects this and switches the contacts (c-b) to the on state. Then, the energizing path of the excitation coil 22b is cut off, and the relay switch 22a closes the contact (C-N C).
In response to this, the energizing path for reverse rotation of the drive motor 7 is cut off, and the door mirror 4 is stopped at the use position. Also, at this time, both ends of the drive motor 7 are connected to the second diode 11. Storage position detection switch 8. Since the fourth diode 13 and the contacts (c-b) of the use position detection switch 9 are short-circuited, the drive motor 7 is subjected to dynamic braking.
As a result, the door mirror 4 can be accurately stopped at the use position. Note that when the relay switch 22a returns to the ON state between the contacts (C-NC) as described above, the supply of base current to the transistor 35 is stopped, so the transistors 35 and 29 are sequentially turned off.

Furthermore, the timer circuit 51 stops the timer operation when a predetermined period of time has elapsed after the output of the rotation command signal Sa.
As described in the above (1), the situation where the drive motor 7 is continuously energized in the locked state is prevented.

(III) When the door mirror 4 is located between the use position and the retracted position... In this state, as can be understood from FIG. The switch 9 is in an on state between contacts (ca). Also, terminal T
9, when the rotation command signal Sa is not input manually, each relay switch 21a,
22a is in a state where the contacts (C-NC) are turned on.

From this state, when the operation switch 20 is turned on,
The rotation command signal Sa causes the potential at point P to rise, and in response to this, the transistor 58 in the timer circuit 51 is turned on. At this time, the common connection point of the resistors 48 and 49 is dropped to the ground level via the diode 60 and storage position detection switch 8, etc., which constitute the five blocking II circuits, as described in (1) above. Therefore, in the holding circuit 38, the transistor 35 is not turned on, but the transistor 31 is turned on. As a result, the transistor 26 is turned on, and the excitation coil 21b of the relay 21 is turned on.
From the power supply terminal TlO to the transistor 26. Diode 23.24. Power is now supplied between the r6 storage position detection switch 8 and the contact (C-NC) of the relay switch 22a, and the contact (C-NC) of the relay switch 21a
NO) is turned on. Then, from the power supply terminal TIO,
Between the contacts (No-C) of the relay switch 21a, between the contacts (a-C) of the use position detection switch 9, between the drive motor 7° and the second diode 11. A forward rotation energization path is formed between the contacts (C-NC) of the storage position detection switch 8 and the relay switch 22a to the ground terminal, and the door mirror 4 is energized in the direction of arrow A of the drive motor 7 accordingly. starts rotating toward the storage position. Furthermore, after this rotation starts, even if the output of the rotation command signal Sa stops, the transistor 58 in the timer circuit 51 and the holding circuit 3
Since the transistor 31 in 1 is held in the on state,
The transistor 26 is now held in the on state, and the drive motor 7 is maintained even after the operation switch 20 is turned off.
The forward rotation energizing path is maintained, and the door mirror 4 continues to rotate in the direction of the retracted position. And door mirror 4
When the is rotated to the retracted position, the retracted position detection switch 8 that detected this is turned off, so the energizing path of the excitation coil 21b is cut off, and the relay switch 21a closes the contact point (C
-NC) returns to the on state, and in response to this, the current supply path for forward rotation of the drive motor 7 is cut off, and the door mirror 4 is stopped at the retracted position.

Note that the timer circuit 51 stops the timer operation when a predetermined period of time has elapsed after the output of the rotation command signal Sa.
There is no possibility that the drive motor 7 will be continuously energized while in the locked state.

In summary, according to this embodiment, when the operation switch 20 is turned on with the door mirror 4 in the retracted position, the second relay 22 is operated and the door mirror 4 is automatically rotated to the use position. Furthermore, when the operation switch 20 is turned on with the door mirror 4 in the use position, the first relay 21 is operated and the door mirror 4 is automatically rotated to the storage position. When the operation switch 20 is turned on while the door mirror 4 is at an intermediate position other than the retracted position and the use position, the first relay 21 is activated preferentially and the door mirror 4 is always rotated to the retracted position. Therefore,
When the operation switch 20 is turned on, the door mirror 4 is prevented from being rotated in a direction contrary to the intention of the user, as in the conventional case. Furthermore, in order to obtain such a preferential rotation function of the door mirror, only two relays 21 and 22 need be provided, and there is no risk of making the entire device into a doll or increasing costs.

The timer circuit 51 in the above embodiment was configured to perform the timer operation by discharging the capacitor 54, but instead of this, as shown in FIG. 4, a timer circuit 51' which performs the timer operation by charging the capacitor 54' It is also possible to have a configuration in which That is, in the example shown in FIG. 4, a resistor 51a is connected between the cathode of the diode 52 and the ground terminal, and a series circuit of a resistor 53 and a constant voltage diode 55 with the polarity shown is connected in parallel with the resistor 51a. , furthermore, a capacitor 54' is connected in parallel with the constant voltage diode 55.
, resistors 56 and 57 are connected in series, and the resistors 56 . The common connection point of '57 is connected to the base of transistor 58. In addition, the diode 4 in FIG.
7.50 is removed and the removed portion is short-circuited, and a diode 5 of the polarity shown is connected between the collector of the transistor 26 and the cathode of the diode 52, and between the collector of the transistor 29 and the cathode of the diode 52, respectively.
1b and 51c.

In this case, when the rotation command signal Sa is applied, a charging current flows through the capacitor 54-, turning on the transistor 58, and thereafter charging the capacitor through the diode 51b or 51c. 54' full 7
One current flows and the transistor 58 is held in the on state,
Thereafter, when a predetermined timer period has elapsed, the capacitor 54' is fully charged and the transistor 58 is turned off.

A second embodiment of the present invention is shown in FIG. 5, and only the differences from the first embodiment will be described below. That is, in this embodiment, one end of the excitation coil 22b of the second relay 22 (that is, the one end connected to the diode 27, 28 in the first embodiment) is directly connected to the ground terminal on the control circuit unit 16 side. , correspondingly diode 27.2B and terminal TT2. The feature is completed at the point where T6 is removed.

With this configuration, when the rotation command signal Sa is given to the terminal T9 in response to the turning on of the operation switch 2o, and the transistor 35.29 is turned on, the excitation coil 22b of the second relay 22 is turned on. On the other hand, the use position detection switch 9
The second relay 22 is energized regardless of the state of the second relay 22 . However, when the storage position detection switch 8 is turned on, the common connection point of the resistors 48 and 49 is grounded by the diode 6o in the blocking circuit 59, preventing the transistors 35 and 29 from turning on.
-, the second relay 22 will not operate. Therefore, the second relay 22 is operated only when the storage position detection switch 8 is turned off, that is, when the door mirror 4 is in the storage position. Similarly to the first embodiment, the first relay 21 is operated preferentially and the door mirror 4
A storage priority operation is performed. In addition, when the excitation coil 22b is cut off (the operation of the second relay 22 is stopped), the timer circuit 5
This is done by sequentially turning off transistors 35 and 29 when transistor 58 is turned off after the timer operation by 1 ends.

This embodiment configured in this manner also has the same effects as the first embodiment, and in particular, according to this embodiment, the right drive unit 6 and the left drive unit 17
The number of lead wires derived from 3 each (power wire t4a, 1
4b, signal line 15a and power supply line 19a, 19b, signal line 18a), thus each drive unit 6
．． The total z1 cross-sectional area of the wire harness connecting between 17 and the control circuit unit 16 can be reduced.

In the second embodiment, after the door mirror 4 is rotated to the use position, the new rotation command signal S is not transmitted until the timer circuit 51 stops the second relay 22 from operating.
Although the input of a is invalidated, if it is necessary to prevent such a situation from occurring, a circuit configuration as shown in FIG. 6 may be used. That is, a resistor 61 is connected between the two points and the ground terminal, and a capacitor 62. is connected in parallel with this resistor 61. resistance 6
3 and 64 are connected in series, and a diode 65 of the polarity shown is connected in parallel with the resistor 64. Then, the common connection point of the resistors 63 and 64 is connected to the ri pn type transistor 6.
The collector and emitter of this transistor 66 are connected between the cathode of the diode 44 and the ground terminal.

With this configuration, when the rotation command signal Sa is given, the transistor 66 is kept in the on state for a certain period of time when the charging current flows through the capacitor 62, so the transistors 35 and 29 are forcibly turned off. At the same time, the transistors 31 and 26 are turned on, and in response, the door mirror 4 is rotated to the retracted position in the same manner as described above.

Further, in each of the above embodiments, the configuration is such that the storage priority operation is performed, but a configuration may also be adopted in which the return operation to the use position is performed with priority.

[Effects of the Invention] According to the present invention, as is clear from the above description, there is provided a control device for an automatic heavy-duty door mirror that allows the door mirror to be rotated back and forth between a first position and a second position by remote control. The door mirror can be selectively and automatically rotated to the first position and the second position, and when the door mirror is located between the above positions, the door mirror can be preferentially rotated to one of the positions. Moreover, the number of relays required for the above-mentioned rotation function can be reduced to two, which has the practical effect of reducing the overall size and reducing costs. It is.

[Brief explanation of the drawing]

Figures 1 to 3 show a first embodiment of the present invention, with Figure 1 being an electrical circuit diagram and Figure 2 showing the operating states of the first position detection switch and the second position detection switch. The figure shown, FIG. 3, is a top view of the automobile. In addition, Figure 4 shows the above-mentioned
5 is a partial electrical circuit diagram showing a modification of the second embodiment of the present invention, FIG. 5 is a diagram corresponding to FIG. 1 showing the second embodiment of the present invention, and FIG. 6 is a partial electrical circuit diagram showing a modification of the second embodiment It is a circuit diagram. In the diagram, 1 is a car, 4.5 is a door mirror, and 6 is 41m1
A drive unit, 7 is a drive motor, 8 is a storage position detection switch (first position detection switch), 9 is a use position detection switch (second position detection switch), 10 is a first diode, 11 is a first position detection switch. 2 a diode, 12 a third diode, 13 a fourth diode, 16 a control circuit unit, 17 a left drive unit, 20 an operation switch,
21 is a first relay, 22 is a second relay, 26 is a transistor (first switching element), 29 is a transistor (second switching element), 38 is a holding circuit, 5
1 indicates a timer circuit, and 59 indicates a blocking circuit.

Claims (1)

[Scope of Claims] 1. A drive motor that rotates the door mirror toward a first position when rotated forward and toward a second position when rotated reversely, and the door mirror; a first position detection switch having an internal contact that exhibits an off state only when the door mirror is in the first position; a second position detection switch having an internal contact that is ON only at certain times; an automatic return type operating switch that outputs a rotation command signal in response to an external operation; and a second position detection switch that is turned on only when the rotation command signal is output. first and second switching elements connected to be turned on, and when the rotation command signal is output with the first position detection switch turned on, the second switching element is turned on. a blocking circuit that prevents the above from occurring, and a first switching element that is energized and operates via the first position detection switch when the first switching element is turned on with the first position detection switch turned on. a second relay that operates by being energized via the second position detection switch when the second switching element is turned on with the second position detection switch turned on; a holding circuit that holds one of the first and second switching elements corresponding to the relay in the operating state in an on state when either one of the first and second relays is operated; An energizing path for causing the drive motor to rotate forward when the first relay is operated is between the second position detection switch or a first diode connected in parallel with the second position detection switch, and the drive motor and the first position detection switch. an energizing path that connects the intervening second diode and the first position detection switch in series and rotates the drive motor in reverse when the second relay is operated; A control device for a door mirror for an automobile, characterized in that a third diode that bypasses the first position detection switch and the second position detection switch are connected in series. 2. A drive motor that rotates the door mirror toward a first position when rotated forward and toward a second position when rotated reversely; and a drive motor that rotates the door mirror toward a second position when rotated reversely; a first position detection switch having an internal contact that is in an off state only when the door mirror is in the first position and in an on state only when the door mirror is in the first position and between the first and second positions; a second position detection switch having an internal contact that exhibits the same function, an automatic return type operation switch that outputs a rotation command signal in response to an external operation, and a second position detection switch that is connected to be turned on when the rotation command signal is output. and a blocking circuit that prevents the second switching element from being turned on when the rotation command signal is output with the first position detection switch turned on. a first relay that is energized and operates via the first position detection switch when the first switching element is turned on with the first position detection switch turned on; The second switching element is energized and operates when the switching element is turned on.
relay, and a holding circuit that holds one of the first and second switching elements corresponding to the relay in the operating state in an on state when either the first or second relay is operated. and a timer circuit that initializes the holding operation by the holding circuit when a certain period of time has elapsed after the output of the rotation command signal, and the drive motor is rotated in the forward direction while the first relay is operated. a second diode interposed between the second position detection switch or the first diode connected in parallel thereto, the drive motor and the first position detection switch, and the first position detection switch; and a third diode connected in series so that the current-carrying path causes the drive motor to rotate in reverse when the second relay is operated, bypassing the first position detection switch. and the second position detection switch are connected in series.