KR100571610B1 - Driving controller for a motor driving rear-view mirror of a vehicle - Google Patents

Abstract

According to the present invention, the switching time is relatively short to prevent the motor from being burned out, and even when the lock current of the motor is generated by the gears of the rearview mirror mechanism when the rearview mirror is folded or unfolded, it can be extinguished, and instantaneously during the rearview mirror operation. The present invention relates to a drive control apparatus for a power folding rearview mirror for a vehicle, in which a circuit may continuously operate even when a folding or expanding operation is performed.

A power supply for supplying power, a PTC element and a first resistor connected to the power supply, a relay coil connected to the first resistor, and a first connected between the relay coil and ground. A motor connected to the capacitor, the first resistor and driving the folding and unfolding operation of the rearview mirror, and between the motor and the ground, and between the motor and the ground when the relay coil is excited. A fifth switch which connects a current path, and a current path which is connected between the relay coil and the relay switch and keeps current flowing in the relay coil when the first capacitor is fully charged. A bypass current is connected between the resistor and the power supply unit and the fifth resistor, and the bypass current is generated when the voltage drop between the PTC element and the first resistor occurs. By limiting the impulse of the motor when the momentary reverse operation of the motor occurs when the operation of the motor is stopped by connecting the first and second transistors and the first and second transistors forming the passage, respectively It comprises a first and a second diode to prevent the first and second transistors from operating instantaneously.

Electric Folding, Rearview Mirror, PTC Element, Relay Switch, Transistor, Motor, Ground

Description

Driving controller for a motor folding rearview mirror {Driving controller for a motor driving rear-view mirror of a vehicle}

1 is a circuit diagram of a drive control apparatus for a vehicle-foldable rearview mirror according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

Q1, Q2: transistors R1, R2, R3, R4, R5: resistors

M: Motor C1, C2, C3, C4: Condenser

RYC: Relay coil L1, L2: Coil

D1, D2: Diode P1: PTC Element

The present invention relates to the field of the electric folding rearview mirror, more specifically, the relatively short switching time can prevent the burnout of the motor, and even if the lock current of the motor is generated by the gears of the rearview mirror mechanism when the rearview mirror is folded or unfolded. The present invention relates to a drive control apparatus for a power folding rearview mirror for a vehicle, which can be extinguished and the circuit can be continuously operated even when the folding or unfolding operation is instantaneously performed during the rearview mirror operation.

In driving a car, the rearview mirror plays a very important role in driving safety by allowing the driver to understand the situation around the car.

However, since the rearview mirror protrudes on the front side of the vehicle, there is a very high possibility of causing a contact accident by the rearview mirror when parking in a narrow space or when crossing a narrow road.

In order to solve such a problem, a technology related to an electric folding rear view mirror that enables a driver to control the standing mirror and the rear view mirror in the driver's seat has been developed, and a technology related to a driving device for driving the electric folding rear view mirror is a Japanese utility model. Korean Patent Application Publication No. 96-268889 (Application Date: Clerk 1996), which was disclosed in "Switch Circuit in Driving Device" of Japanese Patent Application Laid-Open No. Hei 4-76196 (published: July 2, 1992). "Automatic folding rearview mirror control circuit for automobiles" of August 7, 2013, and "Electrically folding rearview mirror control system for automobiles" of No. 97-6175 (filed March 28, 1997), 97-8049 (Application date: April 27, 1997 AD) "Automatic folding rear view mirror drive device for automobiles", and 97-9725 (Application date: May 1, 1997 AD) Application in "Foldable Rear View Mirror Driving Circuit" The bar is described by.

In the conventional electric folding rearview mirror driving apparatus, when the rearview mirror is rotated and positioned at the stop position, the rearview mirror cannot be rotated any more, thereby overloading the forward / reverse drive motor and the overcurrent flows accordingly, thereby causing the temperature of the PTC (Positive Temperature Coefficient) element to flow. Since the resistance value of the PTC (Positive Temperature Coefficient) device is increased, the current path is blocked by the PTC device, that is, the circuit is blocked using the switching characteristic of the PTC device.

However, such a conventional electric rearview mirror drive device, the time taken for the temperature rises and the resistance value increases due to the characteristics of the PTC element, that is, the switching time takes a relatively long time, so that the circuit break is delayed in the state of overcurrent flowing. There is a problem that causes burnout.

In order to solve this problem, by using the voltage drop of the resistance generated when an overcurrent flows to lower the voltage applied to the relay coil below the open voltage, the circuit is cut off relatively quickly before the operating characteristics of the PTC device is achieved. Therefore, a technique for preventing the motor from being burned by an overcurrent has been disclosed in Korean Patent Registration No. 10-0359438 (published date: November 7, 2002) "Vehicle Electric Rear View Driving Device".

However, the above-described conventional "electric vehicle rearview mirror driving device for vehicles" is not operated by immediately shutting off the circuit due to the component capacity value and the motor quiescent current distribution when the reference current or more exceeds the overload caused by various causes during rearview mirror operation. There is a problem that is difficult to cope with abnormal load.

In addition, the above-described conventional "electric vehicle rearview mirror drive device for vehicles" has a relatively long brazier switching switching time, which may cause burnout of the motor along with durability problems.

In addition, the above-mentioned "vehicle electric rearview mirror driving apparatus for vehicles" has a problem that the circuit is not operated momentarily when the lock current of the motor is generated by the gears of the rearview mirror mechanism when the rearview mirror is folded or unfolded.

In addition, the conventional "electric vehicle rearview mirror driving device" has a problem in that the maximum current is generated in the motor when the folding or unfolding operation is momentarily performed during the rearview mirror operation so that the circuit does not operate instantaneously.

An object of the present invention is to solve such a conventional problem, and the circuit breaker switching time is relatively short to prevent burnout of the motor, and the lock current of the motor is increased by the gears of the rearview mirror mechanism when the rearview mirror is folded or unfolded. It is possible to extinguish this even if it occurs, and to provide a drive control apparatus for a power folding rearview mirror for a vehicle that can continuously operate a circuit even if a folding or unfolding operation is instantaneously performed during a rearview mirror operation.

As a means for achieving the above object, the configuration of the present invention includes a power supply unit for supplying power, a PTC element and a first resistor connected to the power supply unit, and a relay coil connected to the first resistor; A first capacitor connected between the relay coil and the ground, a motor connected to the first resistor and driving the folding and unfolding of the rearview mirror, and connected between the motor and the ground. A relay switch for connecting a current path between the motor and ground when the relay coil is excited, and a relay switch connected between the relay coil and the relay switch, and the relay when the first capacitor is fully charged. The fifth resistor forming a current path for continuously flowing current to the coil, and connected between the power supply unit and the fifth resistor, and the PTC When the voltage drop of the ruler and the first resistor is generated, the first and second transistors forming the bypass current path and the first and second transistors, respectively, are connected to the first and second transistors, respectively. It includes a first and a second diode to limit the impulse of the motor when the momentary reverse operation of the motor occurs so that the first and second transistors do not operate instantaneously.

As a means for achieving the above object, the configuration of the present invention is preferably such that the fourth resistor is connected in parallel to the first capacitor so that the first capacitor can be discharged through the fourth resistor after the first capacitor is fully charged.

As a means for achieving the above object, it is preferable that the configuration of the present invention is such that the second capacitor is connected in parallel to the fifth resistor so as to prevent an arc of the relay switch.

As a means for achieving the above object, it is preferable that the constitution of the present invention is such that electromagnetic interference noise is filtered by connecting a coil and a capacitor around the motor.

As a means for achieving the above object, the configuration of the present invention, when the fourth capacitor and the second resistor is connected between the power supply unit and the motor to operate the first and second transistors, It is desirable to prolong the operating time of the motor by delaying for a certain amount of time corresponding to several hours.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings in order to describe in detail enough to enable those skilled in the art to easily carry out the present invention. . Other objects, features, and operational advantages, including the object, operation, and effect of the present invention will become more apparent from the description of the preferred embodiment.

For reference, the embodiments disclosed herein are only presented by selecting the most preferred embodiment in order to help those skilled in the art from the various possible examples, the technical spirit of the present invention is not necessarily limited or limited only by this embodiment Rather, various changes, additions, and changes are possible within the scope without departing from the spirit of the present invention, as well as other equivalent embodiments.

As shown in FIG. 1, the driving control apparatus for a motor-operated folding rearview mirror for a vehicle according to an embodiment of the present invention is connected to a power supply unit B + for supplying power and the power supply unit B +. The capacitor C1 connected between the PTC element P1 and the resistor R1, the relay coil RYC connected to the resistor R1, and the relay coil RYC and the ground GND. ), The motor M connected to the resistor R1, the relay switch RYS connected between the motor M and the ground GND, and the relay coil RRY. To the resistor R5 connected between the relay switch RYS, the transistors Q1 and Q2 connected between the power supply unit B + and the resistor R5, and the capacitor C1. The resistor R4 connected in parallel, the capacitor C2 connected in parallel to the resistor R5, and the motor M Is the coils L1 and L2 and the capacitor C3, the capacitor C4 and the resistor R2 connected between the power supply unit B + and the motor M, and the transistors Q1 and Q2. It comprises a diode (D1, D2) to be connected.

According to the above configuration, the operation of the drive control apparatus of the electric folding rearview mirror for a vehicle according to an embodiment of the present invention is as follows.

In the initial stage of power application, DC current flows through the capacitor C1 momentarily for a time constant time, so that the power supply unit (B +)-PTC element (P1)-resistance (R1)-relay coil (RYC)-capacitor (C1)-ground ( The current flows as the current path leading to GND is formed. In this case, when current flows through the relay coil RIC, it is excited, and the relay switch RYS moves from the B contact to the A contact and is conducted.

In this case, the capacitor C2 serves to prevent the arc generated at the contact of the relay switch RYS.

After the relay switch RYS moves from the contact B to the contact A, the power supply (B +)-PTC element (P1)-resistor (R1)-coil (L1)-motor (M)-coil (L2)-relay As the current path leading to the switch RYS-ground GND is formed, a current flows in the motor M, and the motor M is operated to fold or unfold the rearview mirror.

In this case, the coils L1 and L2 and the capacitor C3 connected to the periphery of the motor M serve to filter the electromagnetic noise.

Next, as the capacitor C1 is fully charged, the current path leading to the power supply unit B + -PTC element P1 -resistance R1 -relay coil (RYC) -capacitor C1 -ground GND is blocked. As the current flows from the power supply (B +)-PTC element (P1)-resistor (R1)-relay coil (RYC)-resistor (R5)-relay switch (RYS)-ground (GND), new current flows. . Therefore, the current continues to flow in the relay coil RIC, and the relay switch RYS maintains the contact A, so that the motor M continues to operate until the rearview mirror reaches the folded position or the unfolded position.

In this case, the current fully charged in the capacitor C1 is discharged through the resistor R4.

When the motor M continues to operate and the rearview mirror reaches the folded or unfolded position, a sudden load is generated from the motor M. Thus, the PTC element P1 is proportional to the load generated from the motor M. And a voltage drop occurs in the resistor R1. When the voltage drop occurs in the PTC element P1 and the resistor R1 as described above, a constant voltage is applied to the transistors Q1 and Q2 which are the current switching elements so that the transistors Q1 and Q2 are turned on so that the current is turned into the transistors Q1 and Q2. Current flows through the current path leading to the power supply (B +)-PTC element (P1)-resistance (R1)-relay coil (RYC)-resistance (R5)-relay switch (RYS)-ground (GND). As no current is supplied, no current flows to the relay coil (RYC). Accordingly, the relay switch RYS moves from the A contact to the B contact, so that the battery (B +)-PTC element (P1)-resistance (R1)-coil (L1)-motor (M)-coil (L2)-relay As the current path leading to the switch RYS-ground GND is interrupted, the operation of the motor M is stopped.

In this case, the capacitor C4 and the resistor R2 have a time constant time R2 * C4 when a voltage drop occurs in the PTC element P1 and the resistor R1 and the transistors Q1 and Q2 are operated. By delaying for a predetermined time corresponding to the role of extending the operating time of the motor (M).

On the other hand, when the input voltage is switched instantaneously during the forward or reverse operation of the motor M, and the momentary reverse or reverse operation of the motor M occurs, the surge current generated in the motor M and the relay, Surge voltages are generated in both directions at full magnitude.

In this case, the diodes D1 and D2 suppress surge currents and surge voltages generated in both directions to protect the transistors Q1 and Q2, which are switching elements, so that the circuit is not broken or cut off, so that Allow forward and reverse operation.

If there are no diodes D1 and D2, the maximum current and voltage are applied to the transistors Q1 and Q2, which are switching elements, by the surge current and the surge voltage of the motor M and the relay, thereby breaking or interrupting the circuit, thereby switching the input voltage. Since instantaneous forward and backward driving is impossible, diodes (D, D2) are required.

In the case where the cars alternate with each other on a narrow road, the role of the diodes D1 and D2 in the circuit is very important because the mirrors must be straightened out after the mirrors are completed.

As described in the above embodiment, the present invention has a relatively short switching time to prevent the motor from being burned out, and even if the lock current of the motor is generated by the gears of the rear view mirror mechanism when the rear view mirror is folded or unfolded, The circuit may be continuously operated even if the folding or unfolding operation is momentarily performed during the rearview mirror operation.

Claims (5)

A power supply unit for supplying power, A PTC element and a first resistor connected to the power supply unit, A relay coil connected to the first resistor; A first capacitor connected between the relay coil and the ground; A motor connected to the first resistor for driving the folding and unfolding of the rearview mirror; A relay switch connected between the motor and the ground and connecting the current path between the motor and the ground when the relay coil is excited; A fifth resistor connected between the relay coil and the relay switch and forming a current path for continuously flowing current in the relay coil when the first capacitor is fully charged; First and second transistors connected between the power supply unit and the fifth resistor and forming a bypass current path when a voltage drop between the PTC element and the first resistor occurs; The first and second transistors are connected to the first and second transistors, respectively, to limit the impulse of the motor when the momentary reverse operation of the motor occurs when the operation of the motor is stopped. A drive control apparatus for an electric folding rearview mirror for a vehicle, comprising a first and a second diode. The method of claim 1, And a fourth resistor connected to the first capacitor in parallel so as to discharge through the fourth resistor after the first capacitor is fully charged. The method according to claim 1 or 2, A drive control device for an electric folding rearview mirror for a vehicle according to claim 5, wherein a second capacitor is connected in parallel to prevent an arc of the relay switch. The method according to claim 1 or 2, Driving control apparatus of the electric folding rearview mirror for a vehicle, characterized in that the electromagnetic interference noise is filtered by connecting a coil and a capacitor around the motor. The method according to claim 1 or 2, When the fourth capacitor and the second resistor are connected between the power supply unit and the motor to operate the first and second transistors, the operation time of the motor is delayed by delaying for a predetermined time corresponding to the time constant time. Driving control apparatus of the electric folding rearview mirror for a vehicle, characterized in that to extend.

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