KR100520767B1 - Apparatus for controlling folding motor for folding side view mirror - Google Patents

Abstract

The present invention relates to a foldable side mirror, and to detect the back electromotive force of the folding motor folding and unfolding the mirror and the current of the folding motor to determine whether the folding motor is restricted, the folding motor 33 for folding or unfolding the mirror; A folding motor driver 32 for supplying power input from external power terminals J1 and J2 to the folding motor 33 to operate the folding motor 33; A back electromotive force detector 34 which is commonly connected between the external power supply terminal J1 and the power input terminal of the folding motor driver 32 to detect back electromotive force generated while the folding motor 33 is operated; The output of the counter electromotive force detector 34 is connected in parallel between the external power supply terminal J1 and the power input terminal of the folding motor driver 32 to detect the current of the folding motor 33, and if the detected current is equal to or greater than a predetermined current. A current detector 40 for grounding the terminals; When power is input from the folding mirror main controller through the external power terminals J1 and J2, the folding motor 33 is operated through the folding motor driver 32, and then if the counter electromotive force is not detected from the counter electromotive force detector 34. The folding motor control device of the foldable side mirror configured to include a folding motor control unit 33 for stopping the operation of the folding motor 33 through the folding motor driver 32 by determining that the motor is restricted.

Description

Folding motor control device for folding side mirror {Apparatus for controlling folding motor for folding side view mirror}

The present invention relates to a folding side mirror, and more particularly, to a folding motor control apparatus for a folding side mirror which prevents an error of motor binding detection by external noise in the completion of operation of a folding motor that folds or unfolds a mirror. will be.

Referring to the conventional folding side mirror as follows.

When the driver presses a folding switch (not shown) located in the driver's seat to fold the side mirror, the side mirror main controller 10 supplies power to the folding motor driver 22 for 16 seconds. Then, the folding motor driver 22 folds the mirror by supplying power to the folding motor 23, and cuts off the power supply to the folding motor 23 when the folding operation of the mirror is completed. The folding mirror main controller 10 cuts off the power supply to the folding mirror driver 22 after the 16 seconds have elapsed.

Similarly, when the driver presses the folding switch once more to unfold the side mirror, the power is supplied to the folding motor 23 to unfold the mirror.

At this time, there are various methods for detecting that the folding motor 23 has been completed and restrained.

First, the motor restraint determining means uses a poly switch 21, as shown in FIG. When an overcurrent flows into the circuit, the polyswitch 21 changes from a low resistor to a high resistor by heat generated by the current. Therefore, the overcurrent is limited to protect the internal circuit of the device. On the other hand, when the overcurrent factor is eliminated and the temperature of the element is lowered, the resistance value of the polyswitch 21 returns to the low value of the initial state to enable the normal operation of the circuit.

That is, when the operation of the folding motor 23 that folds or unfolds the mirror is completed before 16 seconds of supplying the power, and the overcurrent flows in the circuit (motor restrained state), the polyswitch 21 turns into a high resistor. The internal circuit is protected during the 16 seconds.

However, the drawback of such a poly switch 21 is affected by the ambient temperature conditions, there was a problem that does not work properly when repeatedly operated.

Secondly, the motor restraint determining means, which is an alternative to such a polyswitch, uses an integrated circuit controller.

As shown in Figures 2 to 4, the folding motor control apparatus of the conventional foldable side mirror includes a folding motor 33 to rotate or fold the mirror in accordance with the control signal; A folding motor driver 32 for supplying power input from external power terminals J1 and J2 to the folding motor 33 according to a control signal to operate the folding motor 33; A back EMF detector 34 connected in common between the external power terminals J1 and J2 and a power input terminal of the folding motor driver 32 to detect back EMF generated while the folding motor 33 is operated; When power is input from the folding mirror main controller (not shown) through the external power terminals J1 and J2, the folding motor 33 is operated through the folding motor driver 32, and then the back EMF detector 34 When the counter electromotive force is not detected, the motor is configured to include a folding motor control unit 31 which determines that the motor is restricted and stops the folding motor 33 through the folding motor driver 32.

As described above, when the user presses a folding switch (not shown), the folding mirror main controller (not shown) supplies power to the folding motor controller for 16 seconds through the external power terminals J1 and J2.

The folding motor controller 31 controls the folding motor driver 32 to operate the folding motor 33 when power is input from the folding mirror main controller through the external power terminals J1 and J2. The folding motor controller 31 controls the folding motor driver 32 to operate the folding motor 33 while the counter electromotive force is detected from the counter electromotive force detection unit 34, and the operation of the folding motor 33 is completed, so that the counter electromotive force detection unit is completed. If the counter electromotive force is not detected from (34), it is determined that the folding motor 33 is constrained and the folding motor driving unit 32 is controlled to operate the folding motor 33 until power is stopped from the folding mirror main controller. Stop it. Accordingly, the restraint of the folding motor 33 is released to protect the folding motor 33 and the driving gear.

In other words, the counter electromotive force detector 34 amplifies the counter electromotive force generated when the folding motor 33 operates in the transistor TR, and then inputs only the AC signal through the coupling capacitor C to the folding motor controller 31. Output to terminal IN. The folding motor controller 31 outputs an "on" signal to the output terminal OUT while the counter electromotive force is input through the input terminal IN, thereby turning on the power transistors PTR1 and PTR2 of the folding motor driver 32. "To operate the folding motor (33).

When the folding motor 33 is restrained because the mirror is completely folded or unfolded, the AC signal output from the counter electromotive force detector 34 becomes very small. When the AC signal input from the input terminal IN is very small, the folding motor controller 31 determines that the folding motor 33 is completed and restrained, and outputs an "off" signal to the output terminal OUT. The power transistors PTR1 and PTR2 of the folding motor driver 32 are " off " to stop the folding motor 33 to release the restraint of the folding motor 33. FIG.

The output of the counter electromotive force detector 34, that is, the input signal of the input terminal IN of the folding motor controller 31 will be described below.

5A shows a counter electromotive force waveform when the folding motor is operated when the ignition switch is “ON”, and the folding motor controller 31 determines that the folding motor 33 is in an operating state (normally, the motor restraint judgment is performed).

5B is a back EMF waveform when the folding motor is operated in the idle state, but suddenly there are large noise waveforms, but the folding motor controller 31 determines that the folding motor 33 is in an operating state (normally, the motor restraint determination).

5C is a back EMF waveform at the time of restraining the folding motor in the idle state, and since the waveform is very small but there are suddenly large noise waveforms, the folding motor controller 31 is incorrectly operated as a non- restraining state of the folding motor 33. Judgment (Motor bound judgment abnormal).

FIG. 5D illustrates a counter electromotive force waveform at the time of restraining the folding motor when the engine speed is 1500 rpm in the idle state, and since the noise waveforms are suddenly larger than that of FIG. 5C, the folding motor controller 31 is in the restraint state of the folding motor 33. Is incorrectly judged to be in operating condition (Motor constrained judgment abnormal).

5E is a back EMF waveform when the folding motor is restrained in the injector normally mounted state, and FIG. 5F is a back EMF waveform when the folding motor is restrained with one injector removed. Suddenly large noise waveforms decreased by one in FIG. 5F than in FIG. 5E. The folding motor control unit 31 erroneously determines the operating state, not the restraining state of the folding motor 33 (the motor restraint determination abnormality).

As shown in FIGS. 5A to 5F, it can be seen that the noise waveforms increase as the engine speed increases in the idle state or in the idle state, or as the number of injectors increases.

6A and 6B, the voltages of the external power terminals J1 and J2, the current of the folding motor, and the voltage of the folding motor are as follows.

Figure 6a shows the normal operating state of the folding motor 33 when the ignition switch is "on" (ON). Power is supplied for 16 seconds through the external power terminals J1 and J2. The current of the folding motor is a predetermined current flows during the operation period (a), but when the operation of the folding motor is completed and restrained, the restraint current flows during the restraint section (b), so the operation of the folding motor is stopped by the folding motor controller 31. Therefore, the current of the folding motor does not flow during the protection period (c). When the voltage of the folding motor is generated while the operating voltage is generated during the operation period (a), and the operation of the folding motor is completed and constrained, a voltage smaller than the operating voltage is generated during the restriction period (b). The motor is stopped and no voltage is generated at the folding motor during the protection period (c). Therefore, the folding motor 33 is protected during the protection period c after the operation of the folding motor is completed.

FIG. 6B illustrates a malfunction of the folding motor 33 in the idle state. Power is supplied for 16 seconds through the external power terminals J1 and J2. The current of the folding motor flows a predetermined current during the operation section (a), and then, when the operation of the folding motor is completed and constrained, the restraint current flows during the restriction section (b). Since the folding motor controller 31 does not recognize the completion of the folding motor, the folding motor 33 continues to operate the folding motor 33 during the restraint section b. When the voltage of the folding motor is generated during the operation period (a), and the operation of the folding motor is completed and restrained, a voltage slightly smaller than the operating voltage is generated during the restriction period (b). The folding motor controller 31 does not recognize the completion of the folding motor and continues to operate the folding motor during the restraint section b. Therefore, the folding motor 33 is operated until the input power of the external power terminals J1 and J2 is shut off after the folding motor is completed, thereby reducing the life of the folding motor 33 and the driving gear.

As described above, in the folding motor control apparatus of the conventional folding side mirror, when the folding motor is restrained in the idle state, the injector waveform induced by the external power terminal in the idle state overlaps with the counter electromotive force waveform to determine the motor restraint. Because of this error, the constrained folding motor could not be stopped quickly, and the constrained folding motor was operated until the power input was stopped from the folding mirror main controller, thereby reducing the life of the folding motor and the driving gear. .

An object of the present invention is to solve the conventional problems, in particular, in the detection of the folding motor folding or unfolding the mirror to detect the back electromotive force of the folding motor and the current of the folding motor to prevent the error of the motor binding judgment due to external noise It is to provide a folding motor control device of the folding side mirror to improve the durability of the folding motor.

The folding motor control apparatus of the foldable side mirror includes: a folding motor that rotates and folds the mirror according to a control signal; A folding motor driver for supplying power input from an external power terminal to the folding motor according to a control signal to operate the folding motor; A back electromotive force detection unit commonly connected between an external power supply terminal and a power input terminal of the folding motor driving unit to detect back electromotive force generated while the folding motor is operated; A current detector connected in parallel between the external power supply terminal and the power input terminal of the folding motor driver to detect a current of the folding motor and ground the output terminal of the counter electromotive force detector when the detected current is equal to or greater than a predetermined current; When the power is input from the folding mirror main controller through the external power terminal, the folding motor is operated through the folding motor driver. If the back electromotive force is not detected from the counter electromotive force detection unit, the motor is determined to be a motor restraint and the folding motor is driven through the folding motor driver. And a folding motor control unit configured to stop operation.

An embodiment of the present invention will be described in detail with reference to FIGS. 6A, 6C, 7 and 8 as follows.

Folding motor control device of the folding side mirror of the present invention, as shown in Figure 7 and 8,

A folding motor 33 which rotates according to a control signal and folds or unfolds the mirror; A folding motor driver 32 for supplying power input from external power terminals J1 and J2 to the folding motor 33 according to a control signal to operate the folding motor 33; A back EMF detector 34 connected in common between an external power terminal J1 and a power input terminal of the folding motor driver 32 to detect back EMF generated while the folding motor 33 is operated; The counter electromotive force detector 34 is connected in parallel between the external power terminal J1 and the power input terminal of the folding motor driver 32 to detect a current of the folding motor 33, and if the detected current is equal to or greater than a predetermined current. A current detector 40 for grounding the output terminal of the circuit; When power is input from the folding mirror main controller (not shown) through the external power terminals J1 and J2, the folding motor 33 is operated through the folding motor driver 32, and then the back EMF detector 34 If the counter electromotive force is not detected, the motor is configured to include a folding motor controller 33 which determines the motor restraining and stops the folding motor 33 through the folding motor driver 32.

The same reference numerals are given to the same components as in the related art, and the description of the same operations as the conventional one will be simplified.

The current detector 40 added in the present invention is connected to the resistor R1 connected between the external power terminal J1 and the power input terminal of the folding motor driver 32, and the resistor R2 and the photocoupler connected in series. The light emitting diodes (LED) are connected in parallel, and the phototransistor (PTTR) of the photocoupler is connected between the ground and the output terminal of the counter electromotive force detector (34).

When the folding motor 33 is in normal operation, the current flowing through the resistor R2 is so small that the light emitting diode LED of the photocoupler is "off" and the phototransistor PTTR is "off". Accordingly, while the counter electromotive force is detected from the counter electromotive force detector 34, the folding motor controller 31 operates the folding motor 33 through the folding motor driver 32.

On the other hand, when the folding motor 33 is being operated and restrained, the current flowing through the resistor R2 rapidly rises so that the light emitting diode LED of the photocoupler is "on" and emits light, and the phototransistor PTTR is "on". do. Accordingly, since the output of the counter electromotive force detector 34 is "grounded," the folding motor controller 31 determines that the motor is not detected by the counter electromotive force and operates the folding motor 33 through the folding motor driver 32. Stop it. Accordingly, the restraint of the folding motor 33 is released to protect the folding motor 33 and the driving gear.

6A and 6C, the voltages of the external power terminals J1 and J2, the current of the folding motor, and the voltage of the folding motor are as follows.

6A shows the normal operation of the motor as in the prior art when the ignition switch is "ON". Since the restraint state is normally determined after the completion of the folding motor operation, the folding motor 33 is stopped. It works.

Figure 6c shows the normal operating state of the motor in the idle state (idle). Power is supplied for 16 seconds through the external power terminals J1 and J2. The current of the folding motor flows a predetermined current during the operation section (a), and then, when the operation of the folding motor is completed and constrained, the restraint current flows during the restriction section (b). As a result, the output of the counter electromotive force detector 34 is grounded by the current detector 40. Since the counter electromotive force is not detected from the counter electromotive force detector 34, the operation of the folding motor 33 is stopped by the folding motor controller 31 so that the current of the folding motor does not flow during the protection period c. When the voltage of the folding motor is generated while the operating voltage is generated during the operation period (a), and the operation of the folding motor is completed and constrained, a voltage smaller than the operating voltage is generated during the restriction period (b). Since the motor is stopped, no voltage is generated in the folding motor during the protection period (c). Thus, as in the case where the ignition switch of FIG. 6A is "ON", the folding motor 33 is protected during the protection period c after the operation of the folding motor is completed.

As described above, the present invention detects the back electromotive force of the folding motor and the current of the folding motor to determine whether the folding motor is restrained. After the completion of the operation of the folding motor, the restraint determination and stop of the folding motor can be quickly processed. In addition, even when the noise input from the external power terminal in the idle state, that is, the injector waveform is introduced and overlaps with the counter electromotive force waveform, the folding motor current may determine whether the folding motor is restricted.

The folding motor control apparatus of the foldable side mirror detects the back electromotive force of the folding motor and the folding motor current to fold or unfold the mirror to determine whether the folding motor is constrained, regardless of the inflow of external noise. Judgment can be made quickly and accurately, and thus it is useful to quickly stop the folding motor in a restrained state and improve durability of the folding motor and the driving gear.

1 is a block showing the configuration of a folding motor control apparatus of a conventional folding side mirror

       Degree,

Figure 2 is a block showing the configuration of the folding motor control apparatus of the conventional folding side mirror

       Degree,

3 is a flowchart illustrating a folding motor control method according to the related art and the present invention;

4 is a detailed circuit diagram of FIG.

Figure 5a is a counter electromotive force waveform when the folding motor when the conventional ignition switch is "on",

5B is a waveform diagram of back EMF when a folding motor is operated in a conventional idle state.

5C is a back EMF waveform diagram when a folding motor is constrained in a conventional idle state;

5d illustrates a folding motor when the engine speed is 1500 rpm in an idle state.

        Back electromotive force waveform diagram,

5E is a back EMF waveform diagram when a folding motor is restrained in a conventional injector normally mounted state;

FIG. 5F shows the counter electromotive force when the folding motor is restrained with one injector removed in FIG. 5E.

        Waveform,

Figure 6a shows the external power supply terminal when the ignition switch of the prior art and the present invention is "on" (ON);

        Waveform diagram showing voltage, current of folding motor and voltage of folding motor,

6B illustrates a voltage of an external power supply terminal and a folding motor in a conventional idle state.

        Waveform diagram showing current and voltage of folding motor,

Figure 6c is the voltage of the external power supply terminal, in the case of the idle state (idle) of the present invention

        Waveform diagram showing current of motor and voltage of folding motor,

Figure 7 shows the configuration of the folding motor control apparatus of the present invention folding side mirror

       Block Diagram,

8 is a detailed circuit diagram of FIG.

<Description of Symbols for Major Parts of Drawings>

10: folding mirror main control unit 21: poly switch

22, 32: folding motor drive unit 23, 33: folding motor

31: folding motor control unit 34: back electromotive force detection unit

35: constant voltage supply unit 40: current detection unit

Claims (2)

A folding motor that rotates according to a control signal to fold or unfold the mirror; A folding motor driver for supplying power input from an external power terminal to the folding motor according to a control signal to operate the folding motor; A back electromotive force detection unit commonly connected between an external power supply terminal and a power input terminal of the folding motor driving unit to detect back electromotive force generated while the folding motor is operated; A current detector connected in parallel between the external power supply terminal and the power input terminal of the folding motor driver to detect a current of the folding motor and ground the output terminal of the counter electromotive force detector when the detected current is equal to or greater than a predetermined current; When the power is input from the folding mirror main controller through the external power terminal, the folding motor is operated through the folding motor driver. If the back electromotive force is not detected from the counter electromotive force detection unit, the motor is determined to be a motor restraint and the folding motor is driven through the folding motor driver. Folding motor control device of the foldable side mirror, characterized in that it comprises a folding motor control unit for stopping operation. The resistor R2 connected between the external power supply terminal and the power input terminal of the folding motor driver is parallel to the resistor R2 connected in series and the light emitting diode LED of the photocoupler. And a phototransistor (PTTR) of the photocoupler is connected between ground and an output terminal of the counter electromotive force detection unit.