JPH0412834Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a control circuit for an electric folding mirror that can set or store the door mirror at a predetermined position using a switch. In particular, it is designed to always be set at an accurate position from the storage position.

(b) Prior art Regarding conventional mirror position control, Japanese Patent Laid-Open No. 58-22418 and Japanese Patent Laid-Open No. 58-53537
There was something like the one shown in the publication. This has a memory comparison circuit which memorizes the most visible position and moves the mirror by comparing it with the current mirror position so that the mirror can always be set in a predetermined position.

According to this, the mirror can be set to the position where it is easiest to see with a single switch operation.

(c) Problems to be solved by the invention Generally, in order to drive a mirror, the driving force of a motor is transmitted using a plurality of gear groups.

In this case, there is always some play in these gears.

This play is not a problem when the gear is rotated in only one direction, but when the gear is rotated in the forward and reverse directions, it becomes a problem because when the motor is reversed, the gear does not rotate by the amount of this play.

That is, when a mirror that has been moved in one direction is moved in the opposite direction, the gear will not rotate by the amount of play, and a difference will occur between the rotation and the rotation of the motor.

Conventionally, the mirror position was detected based on the rotation of the motor, so this play in the gears caused an error between the detected position and the actual mirror position.
There were cases where it was not possible to set the mirror in the correct position.

(d) Means for solving the problem The play in the gears as described above is predictable, and the present invention attempts to solve the problem by correcting the position of the mirror by this play. It is.

Therefore, the present invention provides an electric storage mirror that includes a motor, a wheel train, a memory circuit, a storage detection switch, a position detection circuit, a coincidence circuit, a storage switch, a set switch, and a motor drive circuit. a fine adjustment switch that rotates the motor in forward and reverse directions via a motor drive circuit only while the mirror is rotated in the retracting direction; ; further comprising a correction circuit which adds a predetermined value to the value of the storage circuit and supplies it to the matching circuit when a signal is output from the storage direction fine adjustment detection circuit when the set switch is operated. .

(e) Embodiment First, a case where the set position shifts due to gear "play" will be explained using FIGS. 4A to 4C.

When the mirror is moved in the order of (set) - (retracted) - (set) as shown in Fig. 4A, the motor is rotated forward and backward in order, and the gears are rotated for "play" each time the motor is rotated forward or backward. A time a occurs during which the is not rotating.

However, in the case shown in Figure 4A, the time _A1 required from setting to storing or from storing to setting always includes the time a, so no matter how many times this operation is repeated, the mirror position is always the same. set in position.

Furthermore, as shown in FIG. 4B, when the mirror that has been set is moved further in the setting direction in order to make fine adjustments and reset it, this operation (set) -
The time B required for (fine setting) does not include the time a because the movement is in the same direction.

However, since the time A ₂ required for (fine set) - (storage) includes the above-mentioned time a, it is possible to set it at the set position by setting the time (storage) - (set) to A ₂ . can.

Unlike these cases, as shown in Fig. 4C, the mirror, once set, is moved in the storage direction for fine adjustment, (set) - (fine storage).
When performing this, the time _A3 required for this includes the time a.

After that, the operation of retracting the mirror (fine retraction) −
(Storing) is in the same direction, so the time C required for this does not include the time a.

Then, when setting the mirror next time, the motor rotates in the opposite direction from the previous one, so there is a time a when the gear does not rotate due to "play", and a time C that is the same as the time required to retract from the set position. If the motor is moved only by 1, the mirror will not reach the set position.

Therefore, in this case, the motor cannot be set at an accurate setting position unless the motor is driven for a longer time than when storing for the time a.

In this embodiment, even in the case shown in FIG. 4C, it is possible to automatically set the position at an accurate position.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a diagram showing a control circuit according to an embodiment of the present invention, FIG. 2 is an internal transparent side view schematically showing the storage mechanism of an electric storage mirror according to the present embodiment, and FIG. 3 is a diagram similar to that shown in FIG. 1. FIG. 2 is a diagram showing a detailed circuit configuration of a motor drive circuit shown in FIG.

First, an outline of the storage mechanism in the present invention will be explained using FIG. 2.

2 is a mirror housing rotatably attached to the door of the vehicle, and 4 is a mirror attached to the mirror housing 2.

6 is a motor installed in the mirror housing 2; 8 and 10 are gears driven by the motor 6; and 12 is a fixed gear fixed to the body of the vehicle and meshing with the gear 10.

In this storage mechanism, the gear 1 is rotated by operating the motor 6 to rotate the gears 8 and 10.
0 rotationally moves around the outer periphery of the fixed gear 12, and the entire mirror housing 2 rotates around the axis A accordingly.

The mirror housing 2 can be rotated clockwise or counterclockwise by rotating the motor 6 in the forward or reverse direction, and by selecting this, the mirror housing 2 can be stored or set. It is possible.

On the other hand, a limit switch 14 is also provided within the mirror housing 2.

When the mirror housing 2 is retracted, the limit switch 14 comes into contact with a retraction detection protrusion 16 attached to the fixed gear 12, etc., and turns on, thereby detecting that the mirror housing 2 is retracted.

Further, a gear 18 meshes with the gear 8, and a disk 20 having a plurality of radial slits is also provided on the same shaft as the gear 18.

Further, a photo sensor 22 consisting of a light emitting element and a light receiving element facing each other so as to sandwich the disk 20 is also provided, and detects the rotation of the disk 20, that is, the rotation speed of the motor 6, and converts it into an electrical signal. .

Next, the control circuit will be explained using FIG.

Components shown in FIG. 2 are designated by the same reference numerals.

24 is a wheel train consisting of gears shown in FIG. 2, and 26 is a rotation pulse generator that includes a photo sensor 22 shown in FIG. 2 and detects the rotation speed of the motor 6 from its output signal.

28 is a set switch for setting the mirror housing 2 in a predetermined position; 30 is a storage switch for storing the mirror housing 2; 32, 3;
Reference numeral 4 designates a flip-flop (hereinafter abbreviated as "FF") which inputs operation signals from the set switch 28 and storage switch 30 to the set input S, respectively.

36 is a position detection circuit that receives a pulse signal from the rotation pulse generator 26 and detects the position of the mirror housing.

This position detection circuit 36 has one input terminal, respectively.
AND gates 38 and 40 which input the output signals of the FFs 32 and 34 and input the signal from the rotational pulse generator 26 to the other input terminal;
a first counter 42 which inputs and counts the output signal of the limit switch 14 and inputs the signal from the limit switch 14 to the reset input R, and a one-shot multivibrator which inputs and counts the output signal of the AND gate 40 and inputs the output signal of the FF 32. The second counter 4 inputs the signal from 46 to the reset input R.
It is composed of 4.

This first counter 42 is connected to the mirror housing 2
The second counter 44 counts the time it takes to move from the storage position to the set position based on the rotation of the motor 6, and the second counter 44 counts the time it takes to move from the set position to the storage position based on the rotation of the motor 6. It is counted as a standard.

Reference numeral 48 denotes a fine adjustment switch, which can move the mirror housing 2 in the set direction by contacting the contact 48a, and can move the mirror housing 2 in the retracting direction by contacting the contact 48b.

50 is the contact point 48b, 48a of the fine adjustment switch 48
This is a storage direction fine adjustment detection circuit (hereinafter abbreviated as "fine adjustment detection circuit") consisting of FFs which input signals from the FF to the set input S and reset input R, respectively.

A correction circuit 52 corrects the count value of the second counter 44 by adding the amount of gear play only when the fine adjustment switch 48 is operated in the storage direction.

This correction circuit 52 includes a memory 54 that stores data regarding motor drive time for correcting a rotation difference between the wheel train 24 and the motor 6 caused by gear play, and a fine adjustment detection circuit that inputs signals from this memory 54. a gate circuit 56 which outputs an input signal when the signal H from the limit switch 14 is input, an AND gate 58 which inputs the signal from the limit switch 14 and a signal H from the fine adjustment detection circuit 50, and a second counter 44 when the output signal thereof is input. and an adder circuit 60 that adds the correction data applied from the gate circuit 56 to the count value of .

62 is a preset memory, which outputs a pulse when inputting a signal from a delay circuit 64 which inputs a signal from the limit switch 14. When a pulse is inputted from a one-shot multivibrator 66, the value indicated by the output signal of the adder circuit 60 is inputted. It is preset to.

68 is a coincidence detection circuit, and the first counter 42
The count value is compared with the value stored in the preset memory 62, and if they match, a signal is output. 70 is FF for stopping motor operation
, the limit switch 14 and the matching circuit 68
The signal from the multivibrator 74 is input to the set input S, and the output signal from the FF 32, 34 is input to the one-shot multivibrator, which outputs a pulse when the output signal from the OR gate 72 is input. Signals from multivibrators 76 and 78 are input to reset input R via OR gate 80.

82 is a motor drive circuit, the motor 6 is connected to outputs A and B, and FF32 and FF32 are connected to inputs C, D, and E.
Contacts 48a and 48b of a fine adjustment switch 48 are connected to the outputs 34 and 70 and the inputs F and G, respectively.

As shown in FIG. 3, this motor drive circuit 82 includes an AND input terminal that inputs the output signal of the FF 70 via an inverter 84 to each input terminal, and inputs the output signals of the FFs 32 and 34 to each other input terminal. gate 8
6, 88, a transistor 96 which inputs the signals from the AND gate 86 and the contact 48a of the fine adjustment switch 48 to its gate via diodes 90, 92 and a resistor 94, and a contact 48b of the AND gate 88 and the fine adjustment switch 48. A transistor 104 inputs a signal to its gate via a diode 98, 100 and a resistor 102, respectively, and a relay switch 106, 108 which turns on when each transistor 96, 104 becomes conductive.
It is composed of.

Next, the operation of the control circuit having the above configuration will be explained. First, when the mirror housing 2 is in the set state, the limit switch 14 is in the off state, and therefore the FF 34 and the first counter 42 are in the reset release state.

Here, when the storage switch 30 is operated, the FF
The output Q of 34 becomes H level.

At this time, the FF70 has already been reset or the one-shot multivibrator 78
Since it has been reset by the pulse output from the output terminal, its output Q is at L level.

Therefore, AND gate 88 in motor drive circuit 82 is open, and diode 98 and resistor 1
An H level signal is applied to the gate of the transistor 104 via the transistor 02.

Therefore, transistor 104 becomes conductive and relay switch 108 is turned on.

When the relay switch 108 is turned on, a current flowing from the output end B in the direction A is applied to the motor 6, and the mirror housing 2 is moved in the storage direction via the wheel train 24.

Further, in response to the rotation of the motor 6, a pulse is output from the rotation pulse generator 26.

This pulse is applied to an AND gate 40 within the position detection circuit 36.

This AND gate 40 is in an open state when the output Q of the FF 34 becomes H level, and the pulse from the rotation pulse generator 26 is generated in the output signal of this AND gate 40, and the second counter 44
is applied to

The second counter 44 counts input pulses and converts the count value into an adding circuit 6 in the correction circuit 52.
Apply to 0.

When the mirror housing 2 is retracted and the limit switch 14 is turned on, the FF 34 is reset, and at the same time, the pulse output from the one-shot multivibrator 74 resets the FF 34.
FF70 is set.

Therefore, the AND gate 88 in the motor drive circuit 82 is closed, the relay switch 108 is also turned off, and the motor 6 is stopped.

Therefore, the rotary pulse generator 26 stops outputting pulses, and the second counter 44 also outputs the AND gate 40.
The count stops because it becomes closed.

After such an operation, the H level signal from the limit switch 14 is applied to the one shot multivibrator 66 via the delay circuit 64, causing it to output a pulse.

This pulse is applied to a preset memory 62 which is connected to an adder circuit 60.
Stores data supplied from

The addition circuit 60 at this time is the fine adjustment detection circuit 50.
is reset in the initial state and the AND gate 58 is closed, so the second counter 4
The count value of 4 is output as is. Therefore, the preset memory 62 contains the second
The count value of the counter 44 is stored as is. Next, when you operate the set switch 28, the FF
32 becomes H level, and the output of AND gate 86 in motor drive circuit 82 becomes H level.

Therefore, the transistor 96 becomes conductive, the relay switch 106 is turned on, and a current is applied to the motor 6 in the direction from the output terminal A to the output terminal B.

When the motor 6 is driven, the mirror housing 2 moves in the setting direction via the wheel train 24.

The pulse output from the rotational pulse generator 26 at this time is generated at the output of the AND gate 38 in the position detection circuit 36, which is already in the open state.
The signal is applied to the first counter 42 .

The first counter 42 counts this pulse,
The count value is applied to matching circuit 68.

The match circuit 68 compares the stored value of the preset memory 62 and the count value of the first counter 42, and when they match, sets its output signal to H level.

When the output signal of the matching circuit 68 becomes H level, the FF 32 is reset and the OR gate 7 is reset.
2 and the one-shot multivibrator 74, the AND gate 86 in the motor drive circuit 82 is closed, the relay switch 106 is turned off, and the motor 6 is stopped.

In the operation of the set switch 28 and the storage switch 30 as described above, no error occurs between the actual movement time of the mirror housing due to "play" and the driving time of the motor, as described above.

Next, as described above, the mirror housing 2 is
After setting the fine adjustment switch 48, close the contact 48b.
When the transistor 104 is forcibly made conductive by contacting the relay switch 108, the relay switch 108 is turned on, and a current flowing from the output terminal B in the direction A is applied to the motor.

As a result, the mirror housing 2 moves in the retracting direction only while the fine adjustment switch 48 is operated, similar to the operation described above.

At this time, the fine adjustment detection circuit 50 enters the set state at the same time as the fine adjustment switch 48 is operated.
The output signal H is set to H level.

When this signal H becomes H level, the correction circuit 52
The gate circuit 56 in the circuit applies the data of the corrected driving time of the motor stored in the memory 54 to the adding circuit 60.

Thereafter, when the storage switch 30 is operated, the motor 6 is operated in the same manner as described above, and the second
Counter 44 counts pulses from rotational pulse generator 26.

When the mirror housing 2 is retracted and the limit switch 14 is turned on, the motor 6 is stopped as described above, and the preset memory 62 stores the data applied from the adder circuit 60.

The adder circuit 60 at this time is an AND gate 58
Since the output of the gate circuit 56 is at H level, it is in an addition state, and the data applied from the gate circuit 56 is
It is added to the count value from the counter 44 and applied to the preset memory 62.

Therefore, the preset memory 62 stores a value obtained by adding the gear play to the count value of the second counter 44.

Therefore, when the set switch 28 is operated thereafter, the motor 6 operates until the count value of the first counter 42 and the stored value of the preset memory 62 match, and the mirror housing 2 is set at the correct set position.

In addition, the fine adjustment switch 48 is connected to the contact point 48b (in the storage direction).
After contacting the contact point 48a (set direction)
If the gear is brought into contact with the gear, the set position will not shift due to play in the gear.

Therefore, the fine adjustment detection circuit 50 is set by the signal from the contact 48a, and its output signal H becomes L level, so that the gate circuit 56 in the correction circuit 52
is in the closed state, and the addition circuit 60 is also in the second counter 4
The state is such that the output signal of No. 4 is applied as is to the preset memory 62.

In this way, in this embodiment, only when a deviation occurs in the set position due to play in the gear, correction is made for the play.

(f) Effects of the invention According to the invention, it is possible to prevent the mirror set position from changing due to play between gears, and it is possible to always set the mirror at the same set position.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of a control circuit according to an embodiment of the present invention, FIG. 2 is an internal transparent side view showing an outline of the door mirror storage mechanism in this embodiment, and FIG.
This figure shows the detailed circuit configuration of the motor drive circuit shown in FIG. 1, and FIGS. 4A to 4C are explanatory diagrams in the case where a shift in the set position occurs due to gear play in the present invention. 2...Mirror housing, 6...Motor, 14
... Limit switch, 8, 10 ... Gear, 12
... Fixed gear, 24 ... Wheel train, 26 ... Rotating pulse generator, 28 ... Set switch, 30 ... Storage switch, 36 ... Position detection circuit, 48 ... Fine adjustment switch, 50 ... Retraction direction fine adjustment detection circuit, 5
2... Correction circuit, 62... Preset memory, 6
8... Matching circuit, 82... Motor drive circuit.

Claims (1)

[Claims for Utility Model Registration] A wheel train that rotates and moves a mirror housing rotatably attached to a vehicle door from a predetermined position to a storage position; A motor that drives this wheel train; Memorizes a predetermined position of the mirror housing. A storage circuit that detects when the mirror housing has reached the storage position; A position detection circuit that detects the position of the mirror housing; A storage circuit that detects that the mirror housing has reached a predetermined position stored in the storage circuit. A matching circuit that moves the mirror housing to the storage position; A set switch that moves the mirror housing to a predetermined position; A motor is driven in forward and reverse rotation by operating the storage and set switches, and a storage detection switch is activated. or a motor drive circuit that stops the motor with the output of the matching circuit; and a fine adjustment switch that rotates the motor in forward and reverse directions via the motor drive circuit only while being operated; and the fine adjustment. A storage direction fine adjustment detection circuit that detects and holds the motor by a switch when the mirror rotates in the storage direction; When a signal is output from the storage direction fine adjustment detection circuit when the set switch is operated; A control circuit for an electric storage mirror, comprising: a correction circuit that adds a predetermined value to a value in a storage circuit and supplies the result to the matching circuit.