JP2010149656A - Door mirror control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a door mirror control device for softly starting/stopping a driving motor. <P>SOLUTION: The door mirror control device includes a first control circuit 1 for supplying a current to a driving motor M to move a door mirror from a rising position to a storage position, and a second control circuit 2 for supplying a current to move the door mirror from the storage position to the rising position. A change-over switch SW1 for a DC power supply E is operated to control the drive of the door mirror to be moved from the rising position to the storage position or vice versa. The first and second control circuits include overcurrent detecting circuits for the driving motor, current-carrying electronic switching elements Q1, Q2 for carrying a current into the driving motor with change-over operation, interrupting electronic switching elements Q3, Q4 for forcibly turning off it in accordance with detected voltage, response circuits 3, 4 for causing a gradual state change from turn-off into turn-on with change-over operation and for causing a gradual state change from turn-on into turn-off with forcible turn-off, and keeping circuits for keeping the interrupting electronic switching elements turn-off until causing the state change from turn-off into turn-on, respectively. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

   The present invention relates to an improvement in a door mirror control device that drives and controls a vehicle door mirror between a standing position and a retracted position.

  Conventionally, the door mirror control device includes a first control circuit that supplies a current in a direction from the standing position to the retracted position to the drive motor via the power supply line, and a direction in which the door mirror moves from the retracted position to the standing position. And a second control circuit that supplies the current to the drive motor via the power supply line, and the changeover switch that switches the connection state of the power supply line to a DC power source moves from the standing position to the storage position. The door mirror is driven and controlled between a direction and a direction opposite to the direction (see, for example, Patent Document 1).

  The first control circuit and the second control circuit are an overcurrent detection circuit that detects an overcurrent flowing through the drive motor by converting it into a detection voltage, and is turned on simultaneously with the switching operation to energize the drive motor. And a cutoff electronic switch element for forcibly turning off the conduction electronic switch element based on the detected voltage. In the overcurrent detection circuit, a so-called PTC thermistor whose resistance increases as the temperature rises is used as a shunt resistor.

According to this conventional door mirror control device, when the rotation of the drive motor reaches the storage position from the standing position and is locked, or when the driving motor rotates from the storage position to the standing position and is locked, the lock current (restraint Current) is detected and the current flowing to the drive motor is cut off.
JP 2002-127824 A

  However, in this conventional door mirror control device, when the power is turned on, the energizing switch element is immediately turned on, and when the lock current is detected, the energizing switch element is immediately turned off. When the drive motor is started, a large starting current flows to the drive motor, and when the drive motor is stopped, a large counter electromotive force is generated, which causes electrical noise.

  Moreover, since a large torque is abruptly generated when the drive motor is started and stopped, there is a disadvantage that an impact is applied to each mechanical component of the door mirror.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a door mirror control device that can softly start the drive motor and softly stop the drive motor. It is to provide.

  The door mirror control device according to claim 1, wherein the door mirror is moved from the retracted position to the standing position by supplying a current in a direction from the standing position to the retracted position to the drive motor via the power supply line. A second control circuit for supplying a current in a direction to the drive motor via the power supply line, and a storage position from a standing position by a switching operation of a changeover switch that switches a connection state of the power supply line to a DC power supply. The door mirror is driven and controlled between a direction toward the opposite direction and the direction opposite to the direction, and the first control circuit and the second control circuit convert an overcurrent flowing through the drive motor into a detection voltage. An overcurrent detection circuit that detects the current, and an energization electronic switch element that is turned on by the switching operation and starts energization of the drive motor; An electronic switching element for forcibly turning off the electronic switch element for energization based on the detected voltage, and the electronic switch element for energization gradually changes from OFF to ON in response to the switching operation and the interruption A response circuit that gradually changes the state of the energizing electronic switch element from on to off in response to a forced off by the electronic switch element, and the overcurrent detection circuit is in a state where the energizing electronic switch element is turned off to on. And a maintaining circuit for maintaining the electronic switch for shutoff in an off state until it changes.

  The door mirror control device according to claim 2, wherein the energizing electronic switch element is a field effect transistor, the blocking electronic switch element is a switching transistor element, and the response circuit includes a capacitor and a resistance element. An integrating circuit, wherein the collector of the switching transistor element is connected to the gate of the field-effect transistor via a resistance element constituting the response circuit, and the emitter of the switching transistor element is connected via the power supply line The overcurrent detection circuit is connected to the source of the field effect transistor, and the overcurrent detection circuit detects a voltage generated across the shunt resistor between the voltage application terminal and the drain of the field effect transistor. A bleeder resistor that divides the voltage and provided in parallel with the bleeder resistor A capacitor that applies a voltage generated across the bleeder resistor to the base of the switching transistor as the detection voltage, and the sustain circuit has a Zener having an anode connected to the power supply line and a cathode connected to the base And a resistor element having one end connected to the cathode of the Zener diode and the other end connected to the voltage application terminal.

  According to a third aspect of the present invention, the door mirror control device is a PTC thermistor whose resistance increases as the temperature of the shunt resistance increases.

  According to the present invention, the drive motor can be started softly when the power is turned on by the changeover operation of the changeover switch, and the drive motor is stopped when the drive motor is forcibly stopped when the lock current is detected. Can be done.

  As a result, it is possible to prevent the starting current from rapidly flowing into the drive motor when the power is turned on, and the generation of electrical noise is suppressed.

  Further, when the power is turned on, the torque at the start of the drive motor gradually increases, so that it is possible to avoid the inconvenience of giving an impact to each mechanical component of the door mirror.

  On the other hand, even when the drive motor is forcibly stopped at the time of detecting the lock current, the drive motor can be forcibly stopped softly, so that a large counter electromotive force can be prevented and generation of electric noise is suppressed. Is done.

  Further, since the drive torque gradually decreases when the drive motor is forcibly stopped, the inconvenience of giving an impact to each mechanical component of the door mirror is also avoided when the drive motor is forcibly stopped.

  Embodiments of a door mirror control device according to the present invention will be described below with reference to the drawings.

  FIG. 1 is an explanatory view showing an embodiment of a door mirror control device according to the present invention. In FIG. 1, reference numeral E is a DC power source such as an automobile battery, reference numeral SW1 is a changeover switch, and reference numeral M is a drive. The motor, reference numeral 1 is a first control circuit, and reference numeral 2 is a second control circuit.

  A plus terminal of the DC power source E is connected to the fixed contact X1 and also to the fixed contact X2 via the power supply line L1. The negative terminal of the DC power supply E is connected to the fixed contact X3 and the fixed contact X4 through the power supply line L2.

  The changeover switch SW1 has interlocking segments SWa and SWb, the interlocking segment SWa is connected to the power supply line L3, and the interlocking segment SWb is connected to the power supply line L4. The first control circuit 1 is provided on the power supply line L3 side, and the second control circuit 2 is provided on the power supply line L4 side. The power supply line L3 is connected to the voltage application terminal Ma of the drive motor M through the diode D1, and the power supply line L4 is connected to the voltage application terminal Mb of the drive motor M through the diode D2.

  The first control circuit 1 has a function of rotating the drive motor M in a direction in which a door mirror (not shown) is directed from the standing position toward the storage position, and the second control circuit 2 is configured such that the door mirror is directed from the storage position to the standing position. It has a function of rotating the drive motor M in the direction.

  The changeover switch SW1 has a function of switching the connection state of the power supply lines L3 and L4 with respect to the DC power source E. When the interlocking piece SWa is connected to the fixed contact X1 and the interlocking piece SWb is connected to the fixed contact X4, a positive voltage is applied to the voltage application terminal Ma of the drive motor M and a negative voltage is applied to the voltage application terminal Mb of the drive motor M. Is applied. When the interlocking piece SWa is connected to the fixed contact X3 and the interlocking piece SWb is connected to the fixed contact X2, a negative voltage is applied to the voltage application terminal Ma of the drive motor M and the voltage application terminal Mb of the drive motor M. A + voltage is applied.

  By the switching operation of the selector switch SW1, the voltage polarity of the DC power source E with respect to the drive motor M is switched, and the door mirror is driven and controlled between a direction from the standing position toward the storage position and a direction opposite to this direction.

  The first control circuit 1 and the second control circuit 2 are overcurrent detection circuits 5 and 6 for detecting an overcurrent flowing through the drive motor M by converting it to a detection voltage VK, and an energizing electronic switch element Q1 having a function described later. , Q2, blocking electronic switch elements Q3, Q4 having functions to be described later, and the energizing electronic switch elements Q1, Q2 gradually change from OFF to ON in response to the switching operation, and the blocking electronic switch elements Q3 , Q4, and response circuits 3 and 4 that gradually change the state of the energizing electronic switch elements Q1 and Q2 from on to off in response to the forced off.

  The energizing electronic switch elements Q1 and Q2 have a function of being turned on in response to a switching operation by the changeover switch SW1 and starting energization to the drive motor M. The energizing electronic switch elements Q1 and Q2 have, for example, field effect Type transistor (FET).

  The cutoff electronic switch elements Q3 and Q4 have a function of forcibly turning off the energization electronic switch elements Q1 and Q2 based on the detection voltage of the overcurrent detection circuits 5 and 6, and the cutoff electronic switch elements Q3 and Q4 are For example, it is composed of a switching transistor.

  Response circuit 3 includes a capacitor Cx, a resistance element Rx2, and a Zener diode ZD1. Response circuit 4 includes a capacitor Cy, a resistance element Ry2, and a Zener diode ZD2.

  One side of the capacitor Cx is connected to the power supply line L3, and the other side is connected to the collector terminal of the cutoff electronic switch element Q3 via the resistance element Rx2. The Zener diode ZD1 has its anode terminal connected to the power supply line L3, its cathode terminal connected to the other side of the capacitor Cx, and connected to the collector terminal of the blocking electronic switch element Q3 via the resistor element Rx2. .

  One side of the capacitor Cy is connected to the power supply line L4, and the other side is connected to the collector terminal of the cutoff electronic switch element Q4 via the resistance element Ry2. The Zener diode ZD2 has an anode terminal connected to the power supply line L4, a cathode terminal connected to the other side of the capacitor Cy, and a resistor element Ry2 connected to the collector terminal of the blocking electronic switch element Q4. . The cathode of the Zener diode ZD1 is connected to one side of the common resistor R5 via the resistor element Rx2. The cathode of the Zener diode ZD2 is connected to the other side of the common resistor R5 via the resistor element Ry2.

  The source of the energizing electronic switch element Q1 is connected to the power supply line L3. The drain of the energizing electronic switch element Q1 is connected to the voltage application terminal Ma of the drive motor M via the shunt resistor Rsx. The source of the energizing electronic switch element Q2 is connected to the power supply line L4. The drain of the energizing electronic switch element Q2 is connected to the voltage application terminal Mb of the drive motor M via the shunt resistor Rsy.

  The emitter of the blocking electronic switch element Q3 is connected to the power supply line L3, and the collector of the blocking electronic switch element Q3 is connected to the gate of the energizing electronic switch element Q1 via the resistance element Rx2. The emitter of the blocking electronic switch element Q4 is connected to the power supply line L4, and the collector of the blocking electronic switch element Q4 is connected to the gate of the energizing electronic switch element Q2 via the resistance element Ry2.

The overcurrent detection circuit 5 includes a shunt resistor Rsx, a first voltage dividing resistor element R1, a second voltage dividing resistor element R3, and a capacitor C1, and is connected to the sustain circuit 7. The shunt resistor Rsx is disposed between the voltage application terminal Ma of the drive motor M and the drain of the energizing electronic switch element Q1. The overcurrent detection circuit 6 includes a shunt resistor Rsy, a first voltage dividing resistor element R2, a second voltage dividing resistor element R4, and a capacitor C2, and is connected to the sustain circuit 8. The shunt resistor Rsy is disposed between the voltage application terminal Mb of the drive motor M and the drain of the energizing electronic switch element Q2.
The sustain circuit 7 includes a Zener diode ZDx and a resistor Rx1, and the sustain circuit 8 includes a Zener diode ZDy and a resistor Ry1. The sustain circuits 7 and 8 maintain the cutoff electronic switches Q3 and Q4 in the off state until the energizing electronic switch elements Q1 and Q2 change from off to on. One side of the first voltage dividing resistor element R1 is a resistor The other side of the first voltage dividing resistor element R1 is connected to the base of the blocking electronic switch element Q3, and is connected to the voltage application terminal Ma of the drive motor M via Rx1. Connected to the side. The other side of the second voltage dividing resistor R3 is connected to the power supply line L3. Capacitors C1 are connected in parallel to both sides of the second voltage dividing resistor element R3.

  One side of the first voltage dividing resistor element R2 is connected to the voltage application terminal Mb of the drive motor M through the resistor Ry1, and the other side of the first voltage dividing resistor element R2 is connected to the base of the cutoff electronic switch element Q4. And is connected to one side of the second voltage dividing resistor R4. The other side of the second voltage dividing resistor R4 is connected to the power supply line L4. A capacitor C2 is connected in parallel on both sides of the second voltage dividing resistor element R4.

  According to the embodiment of the present invention, when the changeover switch SW1 is operated to connect the interlocking segments SWa and SWb to the fixed contacts X1 and X4, the capacitor Cy and the resistor Ry2 constituting the response circuit 4 function as an integrating circuit. Since the voltage of the capacitor Cy gradually increases, the gate voltage of the energizing electronic switch element Q2 gradually increases, and the energizing electronic switch element Q2 reaches the saturation region through the unsaturated region and is turned on.

  Accordingly, the drive motor M is started softly when the power is turned on by the changeover operation of the changeover switch. As a result, it is possible to prevent the starting current from abruptly flowing into the drive motor M when the power is turned on, and the generation of electrical noise is suppressed. Further, when the power is turned on, the torque at the start of the drive motor M gradually increases, so that the inconvenience of giving an impact to each mechanical component of the door mirror is also avoided.

  It should be noted that the Zener diode ZDy and the resistor Ry1 constituting the sustain circuit 8 are not connected to the cutoff electronic switch element Q4, although the energization electronic switch element Q2 is delayed from being turned on after being turned off when the power is turned on. Since the voltage applied to the base is maintained at the L level, the turn-on electronic switch element Q4 is delayed from being turned on, and the energization electronic switch element Q2 can be reliably turned on when the power is turned on.

  As a result, the direction of the arrow Y1 from the positive side of the DC power supply E via the fixed contact X1, the interlocking piece SWa, the diode D1, the drive motor M, the shunt resistor Rsy, the energizing electronic switch element Q2, the interlocking piece SWb, and the fixed contact X4. Current flows toward the negative side of the DC power supply E, for example, the door mirror is driven from the retracted position toward the standing position.

  Next, when the door mirror reaches the standing position, the rotation of the drive motor M is forcibly stopped. However, since the current continues to flow as a lock current (restraint current) in the drive motor M, it occurs at both ends of the shunt resistor Rsy. The voltage V increases.

  When the voltage dividing resistance value by the first voltage dividing resistor element R2 and the second voltage dividing resistor element R4 exceeds the detection voltage VK, the cutoff electronic switch Q4 is turned on from off, and the voltage at the connection point S1 is changed from H level to L level. However, since the response circuit 4 functions as an integration circuit, the gate voltage of the energizing electronic switch element Q2 gradually decreases, and the energizing electronic switch element Q2 is turned off through the unsaturated region. As a result, when the drive motor M is forcibly stopped at the time of detecting the lock current, the drive motor M is softly stopped, so that a large back electromotive force can be prevented from being generated, and the generation of electrical noise is suppressed. Further, when the drive motor M is forcibly stopped, the drive torque gradually decreases, so that the inconvenience of giving an impact to each mechanical component of the door mirror can be avoided.

  Next, when the changeover switch SW1 is operated to connect the interlocking segments SWa and SWb to the fixed contacts X3 and X2, the capacitor Cx and the resistor Rx2 constituting the response circuit 3 function as an integrating circuit, and the voltage of the capacitor Cx is Since the voltage gradually increases, the gate voltage of the energizing electronic switch element Q1 gradually increases, and the energizing electronic switch element Q1 reaches the saturation region through the unsaturated region and is turned on.

  As a result, the direction of the arrow Y2 from the positive side of the DC power source E via the fixed contact X2, the interlocking piece SWb, the diode D2, the drive motor M, the shunt resistor Rsx, the energizing electronic switch element Q1, the interlocking piece SWa, and the fixed contact X3. Current flows toward the negative side of the DC power source E, for example, the door mirror is driven from the standing position toward the retracted position.

  Next, when the door mirror reaches the retracted position, the rotation of the drive motor M is forcibly stopped. However, since a current continues to flow through the drive motor M as a lock current (restraint current), it occurs at both ends of the shunt resistor Rsx. The voltage V increases.

  When the voltage dividing resistance value by the first voltage dividing resistor element R1 and the second voltage dividing resistor element R3 exceeds the detection voltage VK, the cutoff electronic switch Q3 is turned on from off, and the voltage at the connection point S2 is changed from H level to L level. However, since the response circuit 3 functions as an integration circuit, the gate voltage of the energizing electronic switch element Q1 gradually decreases, and the energizing electronic switch element Q1 is turned off through the unsaturated region. Since the operation of sustain circuit 7 is the same as that of sustain circuit 8, the description thereof is omitted.

  Although the embodiments have been described above, as shown in FIG. 2, PTC thermistors PCT1 and PCT2 whose resistance values increase as the temperature rises can be used as the shunt resistors Rsx and Rsy. When PTC thermistors PCT1 and PCT2 are used for the shunt resistors Rsx and Rsy, the detection sensitivity of the lock current is improved.

It is a circuit diagram of the door mirror control device concerning the present invention. It is a circuit diagram which shows the modification of the door mirror control apparatus shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... 1st control circuit 2 ... 2nd control circuit 3, 4 ... Response circuit 7, 8 ... Maintenance circuit E ... DC power supply M ... Drive motor SW1 ... Changeover switch Q1, Q2 ... Electronic switch element Q3, Q4 ... interruption | blocking Electronic switch element

Claims (3)

A first control circuit for supplying a current in a direction from the standing position toward the retracted position to the drive motor via a power supply line; and a current in a direction in which the door mirror is directed from the retracted position to the standing position via the power supply line. And a second control circuit for supplying to the drive motor, and by a switching operation of a changeover switch for switching a connection state of the power supply line to a DC power source, a direction from the standing position to the storage position and a direction opposite to the direction In the door mirror control device for driving and controlling the door mirror between,
The first control circuit and the second control circuit are an overcurrent detection circuit that detects an overcurrent flowing through the drive motor by converting it into a detection voltage, and is turned on by the switching operation to energize the drive motor. An electronic switch element for energization to start, an electronic switch element for forcibly turning off the electronic switch element for energization based on the detected voltage, and the electronic switch element for energization gradually turned off in response to the switching operation A response circuit that changes the state of the energizing electronic switch element gradually from on to off in response to a forced off by the shut-off electronic switch element, and the energizing electronic switch element from off to on And a maintenance circuit for maintaining the electronic switch element for shutoff in an off state until the state changes to a door mirror control device.   The energizing electronic switching element is a field effect transistor, the blocking electronic switching element is a switching transistor element, the response circuit is an integrating circuit including a capacitor and a resistance element, and the switching transistor element The collector is connected to the gate of the field effect transistor through a resistance element constituting the response circuit, and the emitter of the switching transistor element is connected to the source of the field effect transistor through the power supply line, The overcurrent detection circuit includes a shunt resistor disposed between the voltage application terminal and the drain of the field effect transistor, a bleeder resistor that divides a voltage generated at both ends of the shunt resistor, and a parallel to the bleeder resistor. The voltage generated at both ends of the bleeder resistor A capacitor applied to the base of the switching transistor as an output voltage, and the sustain circuit has a Zener diode having an anode connected to the power supply line and a cathode connected to the base, and one end of the cathode of the Zener diode. 2. The door mirror control device according to claim 1, further comprising: a resistance element that is connected and has the other end connected to the voltage application terminal.   The door mirror control device according to claim 2, wherein the shunt resistor is a PTC thermistor whose resistance value increases as the temperature rises.

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