JPS6132178B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for an electric remote control mirror.

This type of product can be used for automobile rearview mirrors, etc. Generally, the rear view mirror for a car must be adjusted to the position that is considered best for checking the rear while driving (hereinafter referred to as the eye point), but this eye point varies depending on the driver, the road being traveled, etc. Therefore, it must be adjusted to the appropriate position each time. Also, even after setting the eye point,
When entering a highway, changing lanes when passing,
You may want to temporarily change the position of the rear view mirror when parking your vehicle or checking the roadside. In such cases, with an electric remote control mirror, the driver can change the rearview mirror to the desired position from the driver's seat, but after this change in field of view is completed, it will return to the original eye point. Must be positioned accurately. However, this makes it cumbersome to operate the switches on the remote control mirror, and while the car is in motion, one hand operates the steering wheel while the other hand operates the switches, which can be dangerous. arise. Further, even if the car is not in motion, it is often difficult to locate the original and accurate eye point using such operations.

In order to improve this problem, a time sequence control circuit having a timer for setting the angle change time, a timer for setting the stop time, and a timer for returning is incorporated into the electric motor circuit of the remote control mirror, and when the start switch is turned on, The electric motor is driven in the angle-changing direction for the time set in the timer for setting the angle-shifting time, then stopped at that angular position for the time set in the timer for setting the stop time, and then the electric motor is driven in the angle-shifting direction for the time set in the timer for setting the angle-shifting time. Therefore, it has been proposed to automatically return the mirror to its original position by driving the electric motor in the opposite direction for a set period of time. (Refer to Japanese Unexamined Patent Publication No. 135338/1983) However, if the forward and return angles are controlled by a timer, there is a risk that even a slight error will occur between the forward angle and the return angle. It is not so bad if you repeat the operation several times, but as the automatic angle return is repeated several times, the error gradually accumulates and it becomes impossible to return to the correct eyepoint.

SUMMARY OF THE INVENTION An object of the present invention is to improve such a problem and provide a control device for an electric remote control mirror that can accurately return to the eye point and easily set the eye point at any position.

In order to achieve the above objects, the present invention has the following features:
An eye point setter, a variable angle position setter, a switching circuit for selecting either the eye point setter or the variable angle position setter, and a mirror position detector for detecting the current angular position of the mirror. The switching circuit constitutes a detection circuit, and the switching circuit selects the eye point setting device in a normal state, and selects the variable angle position setting device when the angle change start switch is closed, and is self-maintained. The output of the mirror position detector is compared with the output of the mirror position detector, and when the two do not match, the mirror drive control circuit is driven to deflect the mirror in the direction in which the two match, and the switching circuit is configured to change the angle of the mirror in the direction in which the two match. When the setting device is selected, if the output of the switching circuit and the output of the mirror position detector match as described above, the timer circuit is driven, and when the timer ends, the switching circuit is switched to the eyepoint setting device side. It is characterized in that one mirror drive control circuit is used for driving when setting the eyepoint, and also for driving when changing the angle and returning to the eyepoint. An example of the implementation of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a block diagram showing the basic configuration of the control device of the present invention. In FIG. 1, 1 is an eye point setter, 2 is a variable angle position setter, 3 is a switching circuit for selecting either the eye point setter or the variable angle position setter, and 4 is a mirror drive motor. 5 or a mirror position detector which detects a value corresponding to the current position of the mirror in conjunction with the mirror; under normal conditions, the comparison circuit 6 compares the value of the eye point setter 1 and the value of the mirror position detector 4; Compare,
If there is a difference between the two, the mirror drive control circuit 7
is driven to change the angular position of the mirror to match the value set in the eye point setter 1, and when the two match, the mirror drive motor 5 is stopped at that angular position.

Further, in the present invention, the start switch 8
When is pressed, the self-holding circuit 9 is self-held, and the switching circuit 3 is switched by the output of the self-holding circuit, and the value of the angle position setter 2 and the value of the mirror position detector 4 are compared by the comparison circuit 6. , thereby driving the mirror drive control circuit 7 to drive the mirror drive motor 5 in the direction designated by the angle position setter 3, so that the value of the mirror position detector 4 changes to the direction specified by the angle position setter 2.
If it matches the value set in , mirror drive motor 5
At the same time, the timer circuit 10 is driven based on the signal, and when the timer circuit finishes counting, the self-holding circuit 9 is reset. The value of the detector 4 is compared and the mirror drive motor 5 is reversed toward the eye point, and when the two match, the mirror drive motor 5 is automatically stopped.

FIG. 3 is an explanatory diagram of a known bridge circuit, where Ra and Rb are fixed resistances, VRa and VRb are variable resistances, and the potential difference between terminals a and b is Vab.
Vab=0 when raRb=rbRa. Then,
Now, if VRa is varied and ra becomes ra′, the other VRb
is varied to set rb to rb', and an output is generated between terminals a and b until ra'Rb=rb'Ra. That is,
Between terminals a and b, if ra′<ra, +Vab, ra′>
If it is ra, -Vab will occur.

FIG. 2 is a circuit diagram showing an example of an embodiment in which the bridge circuit is applied to the control device of the present invention shown in FIG. 1.

In FIG. 2, VR ₁ indicates a variable resistor which is the eyepoint setting device. VR ₂ is a variable resistor which is the variable angle position setting device, and is set in advance to a desired position. VR ₃ is a variable resistor that automatically slides in conjunction with the angular position of the mirror, and corresponds to the mirror position detector. 8 is a start switch; the circuit consisting of R ₁ , C ₁ , and D ₁ is a circuit that generates a positive trigger voltage when start switch 8 is pressed; the circuit consisting of amplifier Amp 1 and resistors R ₃ to _{R 5} is a self-holding circuit; R ₂ and R ₆ are current limiting resistors, transistors Tr ₁ and Tr ₂ , resistors R ₇ and R ₈ , inverter circuit
The circuit consisting of INV-1 is a switching circuit,
When the output of Amp1 is at a low level (when the start switch 8 is not pressed), the sink current of Amp1 turns on Tr ₁ , turns off Tr ₂ , and turns off the variable resistor VR _1.
Select , and press start switch 8 instead.
When the output of Amp1 is high level, Tr ₁ is off,
The configuration is such that Tr ₂ is turned on and variable resistor VR ₂ is selected. R ₉ and R ₁₀ are fixed resistors, and VR ₁ or VR ₂ and VR ₃ , R ₉ , and R ₁₀ constitute a bridge circuit, which operates as described below.

The circuit consisting of amplifier Amp2 and resistors R ₁₁ and R ₁₂ and the circuit consisting of amplifier Amp 3 and resistors R ₁₃ and R ₁₄ are comparator circuits.
Among the positive and negative inputs of Amp3, the higher level one becomes the output. That is, if the negative input side is at a higher level than the positive input side, the output will be at a low level, and in the opposite case, the output will be at a high level. Therefore, if the potential difference Vcd between points c and d in Fig. 2 is positive, then
The output of Amp2 is high level and the output of Amp3 is low level. When Vcd is negative, the output of Amp2 is low level and the output of Amp3 is high level.

AND gate AND and capacitor C ₂ are
This is to generate a trigger voltage and turn on the timer T at the moment the output of Amp2 changes from high level to low level when the output of Amp1 is at a high level.

The circuit consisting of inverter INV-2, capacitor _C3 , and OR gate OR generates a trigger voltage at the moment timer T changes from on to off, and Amp1
This is for resetting a self-holding circuit consisting of resistors _R3 to _R5.At the same time, when the output of Amp3 is at a high level, the self-holding circuit is not turned on even if the start switch 8 is pressed.

A circuit including transistors Tr ₃ to _{Tr 8} and resistors R ₁₅ to _{R 18} is a mirror drive control circuit, and controls forward and reverse rotation of the motor M.

Next, the operation of the device of the present invention will be explained.

Determining the Γ eyepoint Since the output of amplifier Amp1 is normally at a low level, Tr ₁ is on and Tr ₂ is off,
A bridge circuit is configured by VR ₁ , R ₉ , VR ₃ , and R ₁₀ .

In this state, when the eye point is set by manually operating the variable resistor VR ₁ , the output of the amplifier Amp2 or Amp3 becomes high level, and the output of the amplifier Amp2 or Amp3 becomes high level, and the output of the transistors Tr ₃ and Tr ₈ is outputted via the resistors R ₁₅ and R ₁₈ .
A voltage is applied to the bases of the transistors Tr ₆ and Tr ₇ via the resistors R ₁₆ and R ₁₇ to make them conductive to rotate the motor M in the forward or reverse direction and adjust the angle of the mirror. The variable resistor VR ₃ is automatically varied in accordance with the angle adjustment of the mirror, and when Vcd becomes zero, the motor M is stopped and the mirror is stopped.

Γ automatic angle change and return When you press start switch 8, the amplifier Amp1
The self-holding circuit works, and the output of Amp1 becomes high level. Therefore, as Tr ₁ turns off
Tr ₂ turns on, and as a result, a bridge circuit is formed by VR ₂ , R ₉ , VR ₃ , and R ₁₀ , and the output of amplifier Amp 2 becomes high level, driving motor M in the forward rotation direction, and Vcd becomes zero. VR ₃ is variable until it becomes. (At this time, if R ₉ = R ₁₀ , then VR ₁ = VR ₃ > VR ₂ ) Thus, when Vcd becomes zero and the mirror is displaced to the desired angle, the output of amplifier Amp2 becomes a low level and motor M is stopped. At the same time, timer T operates as described above. The time set by this timer is the time the mirror changes its angle and stops.
Set as desired with variable resistor VR ₄ .

When the timer T finishes counting as described above, the self-holding circuit is reset as described above, and Tr ₁
turns on and Tr ₂ turns off, so again
A bridge circuit of VR ₁ , R ₉ , VR ₃ , R ₁₀ is established,
The output of amplifier Amp3 becomes high level until Vcd becomes zero, and the mirror returns to the set eye point. (At this time, if R ₉ = R ₁₀ , then VR ₃ = VR ₂ <
VR ₃ ) In the above and illustrated embodiments, a case has been described in which one remote control mirror is turned in one direction. It is also possible to provide a circuit and a start switch to change the angle of the mirror, and it is also possible to use a motor and a solenoid in conjunction with a remote control mirror that can change the angle not only left and right but also up and down. be.

As described above, according to the present invention, confirmation of following vehicles and overtaking vehicles when changing lanes, confirmation of other vehicles when entering a highway etc., confirmation of the side of one's own vehicle when entering a garage, When checking the shoulder of the road or checking left and right at a T-junction, etc., you can of course automatically change the angle by pressing the start switch once, and automatically return to the eye point after a certain stopping time. However, not only that,
In particular, the present invention includes an eye point setting device, a variable angle position setting device, a switching circuit for selecting either the eye point setting device or the variable angle position setting device, and detecting the current position of the mirror. A detection circuit is configured with a mirror position detector. Under normal conditions, the eye point of the mirror is adjusted by comparing the value of the eye point setter with the detected value of the mirror position detector. When the start switch is pressed, the angle shift position is adjusted. The mirror is moved to the eyepoint by comparing the values detected by the setting device and the mirror position detector, and then the mirror is moved to the eyepoint by comparing the values of the eyepoint setting device and the values detected by the mirror position detector again after the turning is completed. Since the mirror drive control circuit is used both when setting the eyepoint and when changing the angle, the mirror drive control circuit can also be used as the mirror drive control circuit when setting the eyepoint and the mirror drive control circuit when changing the angle. Setting an eyepoint has the effect of automatically returning to the set eyepoint, which greatly contributes to the safety of driving a vehicle.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a control device for an electric remote control mirror according to the present invention, FIG. 2 is a circuit diagram showing an example of its implementation, and FIG. 3 is an explanatory diagram of a bridge circuit. 1, VR ₁ ...Eye point setting device, 2, VR ₂ ...
...Angle position setting device, 3...Switching circuit, 4, VR ₃ ...
... Mirror position detector, 5, M ... Mirror drive motor, 6 ... Comparison circuit, 7 ... Mirror drive control circuit, 8 ... Start switch, 9 ... Self-holding circuit, 10, T ... Timer circuit .

Claims (1)

[Claims] 1 Eye point setting device, angle position setting device,
A detection circuit is constituted by a switching circuit that selects either the eye point setter or the angle position setting device, and a mirror position detector that detects the current angular position of the mirror. selects the eye point setter, closes the start switch for angle change, selects the angle position setter to self-hold, and compares the output of the switching circuit with the output of the mirror position detector. When the mirror drive control circuit is configured to drive the mirror drive control circuit when the two do not match, and the mirror is deflected in the direction in which the two match, and the switching circuit selects the deflection position setter,
As described above, when the output of the switching circuit and the output of the mirror position detector coincide with each other by changing the angle of the mirror, a timer circuit is driven, and when the timer ends, the switching circuit is returned to the eye point setting device side. 1. A control device for an electric remote control mirror, characterized in that one mirror drive control circuit is used for driving when setting an eyepoint, and also for driving when changing the angle and returning to the eyepoint.