JPH0516036Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a door mirror, in which the rotation of the door mirror is stopped by a rotation regulating means in the upright position and the retracted position, and the drive circuit is cut off. This invention relates to a door mirror retracting control device that automatically shuts off the drive circuit even in the event of an unrotable accident.

[Prior Art] A control device that stops rotation by this type of rotation regulating means, detects motor current, and automatically shuts off the drive circuit has a control device that detects motor current and automatically shuts off the drive circuit. A method is used in which conversion is performed and control is performed by comparing with a reference voltage.

[Problems to be solved by the invention] In the conventional case where the motor overload current is converted into a voltage and controlled by comparing it with a reference voltage, the reference voltage which is the detection level is fixed, but the motor current The current value increases or decreases due to temperature differences, and the current value tends to be particularly large for 1 to 1.5 seconds from the start of rotation at low temperatures. Therefore, this may cause malfunction.

The present invention is a control device that uses rotation regulating means to stop the rotation of the door mirror and also stops the motor when the door mirror is in the upright position and the retracted position, thereby preventing malfunctions due to temperature differences, etc., and ensuring automatic control of the drive circuit. The purpose is to provide

[Means for Solving the Problems] In order to achieve the above object, the present invention rotates the door mirror in the upright or retracted direction by rotating a reversible motor built into the door mirror in forward and reverse directions.
Automatically operates the left and right door mirrors all at once in a drive device that forcibly stops the rotation of the door mirrors by means of rotation restriction means in the upright and retracted positions, and also detects the motor current for each left and right door mirror and stops the motor drive. It has a control means including a return type operation switch, a self-holding relay circuit provided individually for the left and right door mirrors, a motor current detection circuit, and a switching circuit, and also masks the signal of the current detection circuit due to motor inrush current for a certain period of time. It is characterized by being equipped with a timer circuit.

In addition, the control means includes a one-button switch that operates the left and right door mirrors all at once, a forward/reverse switching signal circuit that outputs a forward/reverse switching signal based on the operation signal of the switch, and a motor current detection circuit provided individually for the left and right door mirrors. It also includes a case in which the motor is configured of a control signal circuit that issues control pulses for driving the motor, a relay circuit, and a switching circuit that operates and stops the motor in forward and reverse directions based on the output of the relay circuit.

[Function] The motor is driven by a switch operation to rotate the door mirror from the retracted position to the upright position, and when the door mirror reaches the upright position, the rotation restriction means stops the rotation of the door mirror, and at the same time the motor current is increased. Detected by the motor current detection circuit and shuts off the motor drive circuit. In addition, by operating a switch, the motor is reversed and rotated from the upright position to the retracted position, and when the door mirror reaches the retracted position, the rotation regulating means stops the door mirror and at the same time the motor current detection circuit detects an increase in the motor current. It detects this and shuts off the motor drive circuit. Furthermore, even if the door mirror is prevented from rotating by an external force due to an unexpected accident, the motor will stop driving as described above. Furthermore, since the motor current detection circuit is activated after a certain period of time when the door mirror begins to rotate and the motor is overloaded, the rotation of the door mirror is reliably controlled with no malfunctions at low temperatures when overload occurs. can do.

[Embodiments] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a first embodiment in which an automatic return type forward/reverse switching operation switch is used as an operation switch, and FIG. 2 is a circuit diagram specifically showing this block diagram.

Each example will be described below.

The method shown in FIG. 1 is a method in which switching between raising and retracting the door mirrors, that is, switching between forward and reverse directions of the built-in motor, is performed using an automatic return type forward/reverse operation switch.The switch 11 operates the left and right door mirrors at once. A timer circuit 15 and a self-holding relay circuit 12 individually prepared for each left and right door mirror.
a, 12b and motor current detection circuits 13a, 13b
, switching circuits 14a, 14b, and motor
It is composed of M _R and M _L.

FIG. 2 shows a circuit diagram of the right side door mirror control device, and the circuit diagram of the left side door mirror is omitted because its circuit configuration and operation are the same as those on the right side. As shown in the figure, the self-holding relay circuit 12a includes a forward rotation relay _RA , a reverse rotation relay _RB , and a transistor _Tr2 . Forward rotation relay R _A and relay contact
r _B2 , reversing relay R _B and relay contact r _A2 are connected in series and connected in parallel, and connected between ⁺ B and ground via the collector and emitter of transistor Tr ₂ . . Furthermore, Tr ₂
A positive voltage is applied to the base of V _DD via diode D ₇ and resistors R ₃ and R ₅ , and relays R _A and R _B are connected to diodes as shown.
_D5 , _D6 and the switching circuit 14a constitute a self-holding circuit. The motor current detection circuit 13a consists of a transistor Tr ₁ , a resistor R _2, etc., converts the motor current into a voltage using the resistor R ₂ , applies the voltage to the base of Tr ₁ to operate Tr 1, and operates the transistor Tr ₁ through a diode D ₈ . In combination with the _input of
shall be. The switching circuit 14a is connected to the relay.
The combination of the a and b contacts of R _A and R _B enables the motor to operate in forward and reverse directions, and one end of the motor M _R is connected to a load resistor R ₂ .

The timer circuit 15 consists of a timer IC using a monostable multivibrator, and operates the timer IC by applying a positive potential to the terminal A via the operation switch 11 and the diode _D9 or _D10 , and sets the timer IC using _C4 and _R4. A pulse with a pulse width T
Transistor via diode D ₈ and resistor R ₅
It is designed to be input to the base of Tr ₂ .

The operation of the first embodiment will be explained below. When the automatic return type forward/reverse switching operation switch 11 is turned on to the retracted side, the relay circuit is ⁺ B → operation switch 11 → b contact of relay R _B (r _B2-NC ) → diode D ₁ → relay R _A → transistor Tr ₂ → ground, but a positive potential is applied to the base of Tr ₂ via resistors R ₃ , R ₅ and diode D ₇ ,
Since transistor Tr ₂ is “ON”,
Relay R _A operates, and at the same time, one end of relay R _A is connected to ⁺ B by diode D ₅ and the a contact (r _A1-NO ) of relay R _A , and since the operation switch 11 is a self-reset type, after turning on It automatically turns off, but is self-maintained.

Thus, the drive circuit for motor M _R is ⁺ B→relay
A contact of R _A (r _A1-NO ) → Motor M _R → B contact of relay R _B (r _B1-NC ) → Resistor R ₂ → Ground,
The motor M _R , that is, the door mirror rotates to the retracted position.

On the other hand, at the same time as the operation switch 11 is turned on to the storage side, a timer IC using a monostable multivibrator is activated.
A positive potential is applied to terminal A from ⁺ B via diode _D10 . Next, a pulse having a predetermined pulse width T set by R ₄ and C ₄ is outputted from the terminal Q via the diode D ₈ as described above. Therefore, during a certain period of time T during which the motor is overloaded, the transistor is turned off due to motor overcurrent.
Even if Tr ₁ is turned ON, the base of Tr ₂ remains at a positive potential due to the output of the timer IC's terminal Q.
Tr ₂ continues to conduct, and relay R _A continues to hold itself. Then, after the specified time T has elapsed, if Tr ₁ is activated due to detection of motor overcurrent, Tr ₂ is turned OFF.
, and the self-holding of relay R _A is released.

That is, the motor detection circuit 1 is activated by the timer circuit 15.
3a operates with a delay of a certain time T during which the motor is loaded from the start of motor drive, and
After this period, the rotation of the rotating door mirror is stopped by a rotation restriction means (not shown) in the retracted position, or the rotation is prevented by an external force, and the driving motor is overloaded. In this case, the voltage generated across resistor R ₂ becomes large, and this voltage (0.6 to 0.7 V) turns transistor Tr ₁ "ON", and the base voltage of transistor Tr ₂ decreases, turning Tr ₂ "OFF".
Therefore, the self-holding of the relay R _A is released and the driving of the motor M _R is stopped.

Next, a block diagram showing the second embodiment shown in FIG. 3 will be explained.

In this case, there is a push switch 21 that operates the left and right door mirrors all at once, and a forward/reverse switching signal circuit 2.
2, a timer circuit 28, gate circuits 23a, 23b, relay circuits 24a, 24b, and a switching circuit 25 prepared individually for each left and right door mirror.
a, 25b and motor current detection circuits 26a, 26b
and control signal circuits 27a and 27b and motors M _R and M _L
It consists of

As shown in FIG. 4, the forward/reverse switching signal circuit 22 is composed of D-FF IC-1 and IC-2 with S and R, and the output signal of the terminal Q of IC-1 is R ₄ with respect to the input signal. , _C4 , and is input to the terminal CK of IC-2. In response to the above signal, a forward/reverse switching signal is output from terminal Q. (Note that the above-mentioned forward/reverse switching signal refers to a signal for switching the rotation of the motor between forward and reverse and switching the rotation of the door mirror from retracted to raised.) Each of the gate circuits 23a and 23b is composed of four diodes. , the forward/reverse switching signal outputted from the terminal Q of the IC-2, and the motor drive signal outputted from the control signal circuits 27a, 27b, which will be described later, are combined, and the relay circuits 24a, 24b, which will be described later, are combined. The signals are configured to be input to the bases of transistors connected to either forward or reverse relays. For example, when the signal is "L" and "H", the transistor
The motor drive signal "H" is connected to the base of Tr ₄ and Tr ₈ .
is applied.

Relay circuits 24a and 24b each rotate normally (store)
Relays R _A , R _C and relays R _B for reverse (standing),
R _D and the transistor Tr ₃ connected to each of the relays,
Consisting of Tr ₄ , Tr ₇ , and Tr ₈ , each relay has a transistor connected to it whose base voltage is "H".
It is designed to operate only when

The switching circuits 25a and 25b are connected to the relays.
For example, when R _A is activated by combining the a and b contacts of R _A , R _B , R _C , and R _D , ⁺ B → a contact of relay R _A → motor M _R → b contact of relay R _B → Resistor R ₉ → A circuit is formed with earth.

The motor current detection circuits 26a and 26b are constructed by combining resistive loads R ₉ and R ₁₇ of the motor circuit and transistors Tr ₁ and Tr ₅ , respectively, and the voltage generated in the resistive loads, that is, the voltage generated at R ₉ is Tr ₁ On the basis of
The voltage generated across R ₁₇ is applied to the base of Tr ₅ , and
The collector outputs of Tr ₁ and Tr ₅ are input to the bases of transistors Tr ₂ and Tr ₆ of a control signal circuit to be described later, respectively.

The control signal circuits 27a and 27b include transistors Tr ₂ and Tr ₆ and D-FF IC-3 and IC with S and R, respectively.
-4, and the transistors Tr ₂ ,
The base of Tr ₆ and the transistors Tr ₁ of the motor current detection circuits 26a and 26b connected thereto,
A positive voltage is applied to the collector of Tr ₅ , and by turning Tr ₁ and Tr ₅ ON and OFF, Tr ₂ and
Tr ₆ is set to "OFF" and "ON", and Tr ₂ ,
The collector of Tr ₆ is connected to terminal CK of IC-3 and IC-4. Note that the output signal of IC-1 of the forward/reverse switching signal circuit 22 is inputted to the terminal S of IC-3, IC-4, and when the terminal S is set to "H", IC-3, When the control signal "H" is output from the terminal Q of IC-4, the input signal of the terminal CK of IC-3 and IC-4 changes from "L to H", and the input of the terminal D is "L", When Tr ₂ turns OFF and the signal changes from “L→H”, the output stops and changes from “H” →
It is set to be "L".

Timer circuit 28 is a monostable multivibrator
IC-5 inputs a signal to terminal A, outputs a signal from terminal Q with a pulse width of a certain time T set by R ₅₁ and C ₅₁ , and IC-3, It is designed to be input to terminal D of IC-4. Note that in FIG. 4, 40 is a power supply circuit.

The operation of the second embodiment having the above configuration will be explained below using time charts shown in FIGS. 4 and 5.

When the door mirror is in the retracted position, the output states of the IC of the drive circuit shown in FIG. 4 are as follows: the output of terminal Q of IC-1 is "L", the output of terminal Q of IC-2 is "H", When the output of terminal Q of IC-3 is "L" and the output of terminal Q of IC-4 is "L", pressing the push switch 21 once will generate a trigger pulse signal whose pulse width is set by R ₄ and C ₄ . are IC-2, IC-3,
Output to IC-4 and IC-5. As a result, IC-2
The output of terminal Q changes from "H" to "L", and the output from terminal Q changes from "L" to "H". In other words, the signal is "L"
The signal becomes "H" (the operation of the right side door mirror will be described below) (the same applies to the left side). Also,
The output of terminal Q of IC-3 becomes "L" - "H".
That is, the signal becomes "H".

Then, the gate circuit 23a outputs the signal,
, are combined, the base of Tr ₄ becomes "H", Tr ₄ of the relay circuit 24a is turned "ON", the reversing relay R _B is activated, and the switching circuit 25
At a, ⁺ B → A contact of relay R _B → M _R → B contact of relay R _A → R ₉ → Ground and circuit are formed,
The motor reverses and the door mirror begins to rotate toward the upright position.

Note that a signal with a pulse width T is input from terminal Q of IC-5 to terminal D of IC-3, and since terminal D remains "H" for a predetermined time T, the signal input to terminal CK is " Even if the signal becomes "H", the output signal from the terminal Q of IC-3 maintains the "H" state.
After the predetermined time T has elapsed, the signal input to the terminal CK becomes "H" and then the signal becomes "L".
That is, during the predetermined time T, even if the motor detection circuit 26a detects an overload current and the signal becomes "H", the signal maintains the "H" state and the motor M _R does not stop. After the predetermined time T has elapsed, if an overload current of the motor is detected, the signal becomes "L" and the motor stops as described later.

Then, when the door mirror reaches the upright position and the rotation of the door mirror is stopped by the rotation regulating means, the motor current increases. Along with that,
When the terminal voltage of R ₉ increases and the voltage between the base and emitter of transistor Tr ₁ becomes 0.6 to 0.7V, Tr ₁ is activated, and in order to lower the base voltage of transistor Tr ₂ , Tr ₂ is turned OFF, and IC-3 is turned off. The input signal to terminal CK changes from "L" to "H", the output of terminal Q of IC-3 changes from "H" to "L", relay R _B of relay circuit 24a stops operating, and the motor stops. The door mirror will stop rotating.

Next, press the pump switch 21.
Terminal Q of IC-2 is "L" → "H", "H" respectively.
→L”, transistor Tr ₃ is activated and forward rotation relay R _A is activated. Therefore, the motor M _R rotates in the normal direction and the door mirror begins to rotate toward the retracted position. The subsequent operation is the same as described above, so the explanation will be omitted.

[Effects of the invention] As described above, the present invention, when stopping the operation of the motor built in the door mirror, stops the rotation of the door mirror by the rotation regulating means, and
A timer circuit is attached to the drive circuit that detects the increasing motor current and cuts it off.
It is possible to provide a door mirror retraction control device that operates reliably without any malfunctions caused by increases and decreases in motor load due to temperature differences, particularly at low temperatures.

[Brief explanation of the drawing]

Figure 1 is a block diagram for the first embodiment, and Figure 1 is a block diagram for the first embodiment.
The figure is a circuit diagram of the right side door mirror that concretely shows the block diagram in Figure 1, Figure 3 is a block diagram for the second embodiment, and Figure 4 is a circuit diagram that concretely shows the block diagram in Figure 3. , FIG. 5 is a time chart of the circuit diagram of FIG. 4. 11... Automatic return type forward/reverse switching operation switch,
12a, 12b...Self-holding relay circuit, 13
a, 13b...Motor current detection circuit, 14a, 1
4b...Switching circuit, 15...Timer circuit, 40...Power supply circuit, 21...Wamp push switch, 22...Forward/reverse switching signal circuit, 23a, 2
3b...gate circuit, 24a, 24b...relay circuit, 25a, 25b...switching circuit, 2
6a, 26b...Motor current detection circuit, 27a,
27b...control signal circuit, 28...timer circuit,
M _R , M _L ...Motor.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. Rotate the door mirror in the upright or retracted direction by rotating a reversible motor built into the door mirror in the forward and backward directions, and force the rotation of the door mirror by means of rotation restriction means in the upright and retracted positions. The drive device detects the motor current for each of the left and right door mirrors and stops the motor drive, and includes an automatic return operation switch that operates the left and right door mirrors all at once, and a self-holding relay that is installed individually for the left and right door mirrors. What is claimed is: 1. A door mirror retraction control device, comprising: a control means including a motor current detection circuit, a motor current detection circuit, and a switching circuit; 2. The control means includes a one-button switch that collectively operates the left and right door mirrors, a forward/reverse switching signal circuit that outputs a forward/reverse switching signal based on the operation signal of the switch, and a motor current detection circuit provided individually for the left and right door mirrors. The door mirror storage control according to claim 1, which is comprised of a control signal circuit that outputs control pulses for driving the motor, a relay circuit, and a switching circuit that operates and stops the motor in forward and reverse directions based on the output of the relay circuit. Device.