JPH075935U - Control device for electric door mirrors for automobiles - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the size of the entire device and reduce the number of harnesses required. [Structure] Motors 6 and 7 reciprocally rotate door mirrors 4 and 5 between a retracted position and a retracted position in response to energization in forward and reverse directions. The drive circuit 29 includes the FETs 21 to 28 for forming the forward and reverse current paths of the motors 6 and 7, and a driver for selectively turning on the FETs 21 to 28 according to the ON operation of the operation command switch 13. And 30. The drive circuit 29 is integrated with the other protection circuit 33 and the signal generation circuit to form the control unit 12, and the control unit 1
2 is housed in a case for the operation command switch 12.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vehicle electric door mirror control device for remotely reciprocating an automobile door mirror between a retracted position and a retracted position.

[0002]

[Prior art]

 In recent years, a door mirror is reciprocally rotated between a storage position in a state substantially parallel to a door and a return position, which is a use position in a normal state, according to forward and reverse rotations of a motor provided in the door mirror. Such devices are widely used. In such a device, in addition to the operation command switch for remote operation, there are a plurality of switching devices that are turned on by the operation of the operation command switch to selectively form forward and reverse current paths of the motor. Although a drive circuit including elements is provided, conventionally, the drive circuit, the operation command switch, and the door mirror are each an independent component, and the components are connected by a wiring harness.

However, such a configuration requires a large number of wiring harnesses and requires a relatively large installation space for the drive circuit, which is a component independent of the operation command switch and the door mirror. There was a problem that it was difficult to downsize the whole.

Therefore, in order to deal with such a problem, it has been conventionally attempted to reduce the wiring harness and downsize the entire device by adopting a configuration in which the drive circuit is housed in the operation command switch. Is being considered.

[0005]

[Problems to be solved by the device]

 In the above-mentioned conventional configuration, when the drive circuit composed of a plurality of switching elements is housed in the operation command switch, in addition to the lead wire for supplying power to the motor through the switching element, a plurality of switching elements are provided. Multiple lead wires are required to give an on / off command to the. Therefore, although it is possible to achieve the purpose of downsizing the entire apparatus, there is a problem that it is difficult to sufficiently reduce the number of lead wires required for the wiring harness pulled out from the door mirror.

The present invention has been made in view of the above circumstances, and an object thereof is to realize downsizing of the entire device, and to use a harness (one) from the operation command switch to the drive circuit, and an operation command switch. The purpose of the present invention is to provide a control device for an electric door mirror for an automobile, which has a practically useful effect of reducing the number of ground harnesses (1).

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention selectively turns on a motor that reciprocally rotates a door mirror between a storage position and a return position in response to energization in forward and reverse directions, and an operation command switch. A control device for an electric door mirror for an automobile, comprising a plurality of semiconductor switching elements, and a drive circuit for forming one of a forward conduction path and a reverse conduction path of the motor through the semiconductor switching elements, A control unit formed by integrating the drive circuit including the semiconductor switching elements into an integrated circuit is provided, and then the control unit is housed in a case for the operation command switch.

In this case, a reverse voltage blocking diode that is in a forward direction with respect to the power supply voltage input direction of the control unit may be connected to the power supply terminal of the control unit.

[0009]

[Action]

 Each of the forward and reverse current paths to the motor is formed by a plurality of semiconductor switching elements that are selectively turned on by operating the operation command switch. Is reciprocally rotated between the retracted position and the retracted position. In this case, since the drive circuit including the semiconductor switching element is integrated into the operation command switch and housed in the case for the operation command switch, the entire device can be downsized. In this case, the switching signal harness connecting the operation command switch and the drive circuit is reduced, and the operation command switch and the drive circuit can be shared with the ground, which reduces the ground harness.

If a diode for blocking a reverse voltage that is in a forward direction with respect to the control unit power supply voltage input direction is connected to the power supply terminal of the control unit, the control unit is erroneous with respect to the power supply. Even when the connection is made in the polar state, there is no possibility that an abnormal voltage is applied to the control unit.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In FIG. 4 showing a schematic plan view of a vehicle, door mirrors 4 and 5 are provided at front end portions of a driver side door 2 and a passenger side door 3 of the vehicle 1, respectively. , It is possible to move back and forth between the return position (see the solid line) which is substantially orthogonal to the doors 2 and 3 and the storage position (see the chain double-dashed line) which is substantially parallel to the doors 2 and 3. ing. Actually, each of the door mirrors 4 and 5 is configured to be rotatable to a position further forward than the return position.

In FIG. 1 showing the electrical configuration, motors 6 and 7 are housed in the door mirrors 4 and 5, respectively, and the corresponding door mirrors 4 and 5 are turned on and off in accordance with energization in the forward and reverse directions. It is designed to rotate back and forth. Specifically, each of the motors 6 and 7 rotates forward when a current flows in the direction of arrow A in the drawing to rotate the door mirrors 4 and 5 toward the storage position. Is rotated in the opposite direction to rotate the door mirrors 4 and 5 in the opposite direction.

Since the storage position detection switches 8 and 9 are provided in the door mirrors 4 and 5, respectively, they are in an off state which is a detection state only when the corresponding door mirrors 4 and 5 are in the storage position. When it is not in the position, it is turned on. Further, the return position detection switches 10 and 11 are also provided in the door mirrors 4 and 5, respectively, and these return switches are in an off state which is a detection state when the corresponding door mirrors 4 and 5 are in the return position, and the return position detection switch is returned. When it is not in the position, it is turned on.

In this case, the motor 6 built in the door mirror 4 has its both ends connected to terminals T3 and T4 of the control unit 12 which will be described later via lead wires, and also has both ends respectively having the storage position detecting switch 8 and It is connected to the terminals T1 and T2 of the control unit 12 through the lead line after passing through the return position detecting switch 10.

Further, also in the motor 7 built in the door mirror 5, both ends thereof are connected to the terminals T3 ′ and T4 ′ of the control unit 12 via the lead wires, and similarly, both ends thereof respectively store the storage position detecting switch 9 as well. And the return position detection switch 11 and then connected to the terminals T1 'and T2' of the control unit 12 via lead wires.

The operation command switch 13 is provided in the driver's seat of the automobile, and is of a momentary type that is turned on only when it is operated. The operation command switch 13 has one end connected to the accessory terminal ACC and the other end connected to the ground terminal through the surge absorber 14, and the common connection point with the surge absorber 14 is the control unit 12. It is connected to terminal T5. The function of the surge absorber 14 can be replaced with a resistor and a capacitor.

The control unit 12 will be described below. That is, the control unit 12 is actually configured as an integrated circuit monolithic IC, but in FIG. 1, it is shown by a combination of functional blocks. In addition to the terminals T1 to T4, T1 'to T4' and T5, the control unit 12 has a terminal T6 to which an external capacitor 16 of the internal oscillator circuit 15 is connected (instead of the external capacitor 16, an internal capacitor A capacitor may be provided), a terminal T7 for signal output, a pair of terminals T8 and T9, and other terminals (not shown) are provided. The terminals T8 and T9 correspond to the power supply terminals in the present invention. The terminal T8 is connected to the positive terminal of the vehicle battery 17, and the terminal T9 is connected to the external ground terminal.

In this case, a diode 18 for blocking a reverse voltage, which is in a forward direction with respect to a power supply voltage input direction of the control unit 12, is previously connected to a terminal T8 connected to the positive side of the vehicle-mounted battery 17. There is. Specifically, the diode 18 has its cathode connected to the terminal T8, and when connecting the control unit 12 to the power supply, connect the anode of the diode 18 to the positive terminal of the vehicle-mounted battery 17. become. As the diode 18, a Schottky barrier diode having a small forward voltage drop is used, and it is necessary to prevent a situation where the power supply voltage of the control unit 12 is insufficient due to the voltage drop. ing. A surge absorber 19 is connected between the anode of the diode 18 and the external ground terminal.

The internal configuration of the control unit 12 is as follows. The constant voltage circuit 20 is supplied with power from the terminal T8 and functions as a power source for each circuit element in the control unit 12. FETs 21 and 22 as semiconductor switching elements are connected between the terminals T8 and T1 and T2, and FETs 23 and 24 as semiconductor switching elements are connected between the terminals T3 and T4 and T9. Has been done. Further, FETs 25 and 26 as semiconductor switching elements are connected between the terminals T8 and T1 'and T2', respectively, and semiconductor switching elements are connected between the terminals T3 'and T4' and the terminal T9. FETs 27 and 28 are connected. A flywheel diode (not shown) having the illustrated polarity is connected to each of the FETs 21 to 28.

The FETs 21 to 28 are turned on and off by the output of the driver 30 that constitutes the drive circuit 29 in the present invention together with the FETs 21 to 28. This driver 30 turns on the FETs 22, 24, 26, 28 when the input signal to the storage command signal input terminal Q1 is rising, and turns on the FETs 21, 24, 26 and 28 when the input signal to the return command signal input terminal Q2 is rising. 25 and 27 are turned on.

The storage command signal input terminal Q1 is connected to the output terminal of the AND circuit 31, and the return command input terminal Q2 is connected to the output terminal of the AND circuit 32. The output of the protection circuit 33 is applied to one input terminal of each of the AND circuits 31 and 32.

The protection circuit 33 is for protecting the FETs 21 to 28, and outputs a detection signal (high level signal) in each state in which the overheat state, the overcurrent state and the overvoltage state of the FETs 21 to 28 are detected. The overheat detector 34, the overcurrent detector 35 and the overvoltage detector 36 for outputting, the RS flip-flop 37, the OR circuit 38 and the NOR circuit 39 are connected as shown in the figure. The output of the NOR circuit 39 is applied to the AND circuits 31 and 32.

The protection circuit 33 outputs a high-level signal from the NOR circuit 39 in a normal state in which no detection signal is output from each of the detection units 34 to 36. When the detection signal is output from either one, the NOR circuit 39 outputs a low level signal. In particular, when the detection signal is output from either the overheat detection unit 34 or the overcurrent detection unit 35, the RS flip-flop 37 is set and the signal output state is stored. The memory state is held until the signal to the reset terminal R of the RS flip-flop 37 rises. Further, the detection signals from the overheat detecting section 34 and the overcurrent detecting section 35 are outputted to the outside through a terminal T7 and used to inform an abnormal state. At the reset terminal R of the RS flip-flop 37, the output of the monostable multivibrator 40 which is operated when the input signal at the terminal T5 rises (when the operation command switch 13 is turned on) is provided. To be given.

The output of the OR circuit 41 is given to the other input terminal of the AND circuit 31, and the output of the AND circuit 42 is given to the other input terminal of the AND circuit 32. It is designed to be used.

The OR circuit 41 and the AND circuit 42 constitute a part of the signal generating circuit 43. The signal generating circuit 43 has terminals T5 and T3, T4, T'3, T4 '. In the meanwhile, the monostable multivibrators 44 to 46, the OR circuits 47 to 49, the AND circuits 50 and 51, the NOT circuits 52 to 54, the timer circuit 55 and the delay circuit 56 are illustrated together with the OR circuit 41 and the AND circuit 42. It is configured by connecting as shown below.

In this case, the time constants of the monostable multivibrators 44, 45 and 46 are set to 25 ms, 100 ms and 1 ms, respectively. The timer circuit 55 performs the timer operation for the set time in the state where the high level signal is given to the set terminal S, and holds the state in which the high level signal is output from the output terminal OUT during the timer operation period. In addition, when the reset terminal R is supplied with a high level signal, the timer operation is initialized. At this time, the timer circuit 55 sets the timer operation time to, for example, 15 seconds when the high level signal is applied to the terminal C1, and the timer operation time when the high level signal is applied to the terminal C2. The time is set to 6 seconds, for example.

The control unit 12 as described above is configured as a monolithic IC as described above and has a relatively small shape. As shown in FIG. It is stored in the case 57 for the switch 13. As shown in FIG. 3, in the case 57, in addition to the operation command switch 13, a remote control mirror switch 58 for rotating the mirror surfaces of the door mirrors 4 and 5 and a control target by the remote control mirror switch 58 are door mirrors. A switching switch 59 for selecting any one of 4 and 5, an ultrasonic switch 60 for removing water droplets adhering to the mirror surfaces of the door mirrors 4, 5 with an ultrasonic transducer, and an operation state of the ultrasonic switch 60. An indicator 61 to be displayed is provided.

Next, of the control contents of the control unit 12, the main ones will be schematically described. Now, when the FETs 21 to 28 do not correspond to any of overheat, overcurrent and overvoltage states, the high level signal is output from the NOR circuit 39 in the protection circuit 33, and therefore the AND circuits 31, 32. Allow the signal from the signal generating circuit 43 to pass through. Further, when the door mirrors 4 and 5 are not in the retracted position, the storage position detection switches 8 and 9 are on and the return position detection switches 10 and 11 are off.

When at least one of the door mirrors 4 and 5 is in a state other than the storage position and the operation command switch 13 is turned on, the following control is performed. That is, when the operation command switch 13 is turned on, the monostable multivibrator 44 is triggered in response to the rise of the input signal at the terminal T5, so that the monostable multivibrator 44 is operated for a fixed time (25 msec). High level signal is output.

Then, the high level signal is supplied to the storage command signal input terminal Q1 of the driver 30 via the OR circuit 41 and the AND circuit 31 and to the terminal C1 of the timer circuit 55 in the signal generation circuit 43. Then, the timer time of the timer circuit 55 is set to 15 seconds. Further, since the high level signal is inverted by the NOT circuit 52 into a low level signal and given to the AND circuit 42, the high level signal is output from the AND circuit 42 (that is, the return instruction signal of the driver 30). The application of the high level signal to the input terminal Q2 and the terminal C2 of the timer circuit 55 is prohibited.

The driver 30 turns on the FETs 22, 24, 26, 28 when the storage command signal input terminal Q1 receives the high level signal as described above. Then, a forward rotation energization path is formed from the terminal T8 to the terminal T9 via the FET 22, the storage position detection switch 8, the motor 6 and the FET 24, and also from the terminal T8, the FET 26 and the storage position detection switch 9 are formed. , A motor 7 and a FET 28 are used to form a forward rotation energization path to the terminal T9, so that a current flows in the direction of arrow A through the motors 6 and 7, and accordingly, the door mirrors 4 and 5 are stored at the storage positions. It will be rotated in the direction.

As described above, when the energization of the motors 6 and 7 is started, a high level signal is input to the terminals T3 and T3 ′, and the high level signal is supplied to the OR circuit 47 and the AND circuit 51. Since it is input to the set input terminal S of the timer circuit 55 via the timer circuit 55, the timer circuit 55 starts the timer operation for the time (15 seconds) set as described above, and during the timer operation period. A high level signal is output from the output terminal OUT and applied to one of the input terminals of the AND circuits 42 and 50. In this case, the monostable multivibrator 46 (time constant 1 msec) is triggered by receiving the high level signal from the terminals T3 and T3 'via the OR circuit 48. The high-level signal from is supplied to the reset terminal R of the timer circuit 55 through the OR circuit 49, and the timer circuit 55 is initialized once.

Since the high-level signals input to the terminals T3 and T3 ′ are given to the other input terminal of the AND circuit 50 through the OR circuit 48, during the timer operation period of the timer circuit 55, A high level signal is output from the AND circuit 50, and the high level signal is applied to the storage command signal input terminal Q1 of the driver 30 via the OR circuit 41 and the AND circuit 31.

Therefore, even after the operation command switch 13 is turned off, the state in which the FETs 22, 24, 26, 28 are turned on by the driver 30 is maintained, and the motor 6, as described above, The energization of 7 (and thus the rotation of the door mirrors 4 and 5 toward the storage position) is continued. At each timing when the door mirrors 4 and 5 are rotated to the storage position, the forward rotation energization paths as described above are cut off in response to the storage position detection switches 8 and 9 being turned off. Since the electricity is cut off, the door millers 4 and 5 come to be stopped at the storage position. If one or both of the door mirrors 4 and 5 are in the locked state and are not rotated to the storage position during rotation, the storage command signal input of the driver 30 is input when the timer circuit 55 times out. Since the input of the high level signal to the terminal Q1 is stopped, the FETs 22, 24, 26 and 28 are turned off at that point and the motors 6 and 7 are cut off.

On the other hand, when the operation command switch 13 is turned on while the door mirrors 4 and 5 are both in the storage position, the following control is performed. That is, also in this case, the monostable multivibrator 44 is triggered and a high level signal is given to the storage command signal input terminal Q1 of the driver 30, so that the driver 30 turns on the FETs 22, 24, 26 and 28. become. However, when both the rear mirrors 4 and 5 are in the retracted position, the retracted position detection switches 8 and 9 are off, so that the motors 6 and 7 are not energized.

On the other hand, when the operation command switch 13 is turned on and the input signal at the terminal T5 rises, the monostable multivibrator 45 is triggered, so that the monostable multivibrator 45 is kept high for a fixed time (100 msec). Since the level signal is output, the high level signal is input to the set terminal S of the timer circuit 55 via the OR circuit 47 and the AND circuit 51, and the timer circuit 55 starts the timer operation.

Then, the high-level signal output from the output terminal OUT of the timer circuit 55 is applied to one input terminal of the AND circuit 42 via the delay circuit 56. At this time, when the output of the high level signal from the monostable multivibrator 44 (time constant 25 msec) is stopped, the other input terminal of the AND circuit 42 receives the high level signal via the NOT circuit 52. Is given, the AND circuit 42 outputs a high level signal.

As a result, the high-level signal output as described above is applied to the return command signal input terminal Q2 of the driver 30 via the AND circuit 32, and also applied to the terminal C2 of the timer circuit 55. The timer time of the timer circuit 55 is set to 6 seconds.

The driver 30 turns on the FETs 21, 23, 25 and 27 when the high level signal is received at the return command signal input terminal Q2 as described above. In this case, since the rear mirrors 4 and 5 are both in the retracted position and the return position detection switches 10 and 11 are turned on, the FET 21, the return position detection switch 10, the motor 6 and the FET 23 are connected from the terminal T8. A reverse rotation energization path is formed from the terminal T8 to the terminal T9 through the FET 25, the return position detection switch 11, the motor 7 and the FET 27. Therefore, a current flows in the direction opposite to the arrow A through the motors 6 and 7, and accordingly the door mirrors 4 and 5 are rotated toward the return position.

As described above, when the energization of the motors 6 and 7 is started, the high level signals are input to the terminals T4 and T4 ′, and the high level signals are supplied to the OR circuit 47 and the AND circuit 51. Since it is input to the set input terminal S of the timer circuit 55 via the timer circuit 55, the timer circuit 55 starts the timer operation for the time (6 seconds) set as described above, and during the timer operation period. A high level signal is output from the output terminal OUT and applied to one input terminal of the AND circuits 42 and 50.

At this time, since the low level signal input to the terminals T3 and T3 ′ at this time is given to the other input terminal of the AND circuit 50 via the OR circuit 48, No high level signal is output from 50. On the other hand, in the AND circuit 42, since a high level signal is applied to both input terminals, a high level signal is output from the AND circuit 42 during the timer operation period of the timer circuit 55. The high level signal is applied to the return command signal input terminal Q2 of the driver 30 via the AND circuit 32.

Therefore, even after the operation command switch 13 is turned off, the state in which the FETs 21, 23, 25, 27 are turned on by the driver 30 is maintained, and the motor 6, as described above, The energization of 7 (therefore, the rotation of the door mirrors 4 and 5 toward the returning position) is continued. Then, at each timing when the door mirrors 4 and 5 are rotated to the return position, the reverse rotation energizing paths as described above are cut off in accordance with the turning-off of the return position detection switches 10 and 11, so that the motors 6 and 7 are driven. Since the power is cut off, the rear mirrors 4 and 5 are stopped at the return position. If one or both of the door mirrors 4 and 5 are locked during the rotation and cannot be rotated to the return position, the return command signal input terminal of the driver 30 will be output when the timer circuit 55 times out. Since the input of the high level signal to Q2 is stopped, the FETs 21, 23, 25 and 27 are turned off at that point and the motors 6 and 7 are cut off.

Therefore, according to the configuration of this embodiment described above, the drive circuit 29 including the FETs 21 to 28 for driving the motors 6 and 7 is configured as the control unit 12 integrated with other circuit elements. In addition, since it is configured to be housed in the case 57 for the operation command switch 13 in such an integrated state, downsizing of the entire device can be realized. The number of switch signal harnesses that are connected to the drive circuit will be reduced, and the operation command switch and drive circuit can be shared with the ground, reducing the ground harness. However, from the side of the door mirrors 4 and 5, it is only necessary to pull out four lead wires for connecting the internal motors 6 and 7 to the control unit 12, and the on / off command is issued to a plurality of switching elements. In addition to multiple lead wires for supplying power, a practical effect of reducing the number of lead wires required compared to the conventional configuration that requires lead wires for supplying power to the motor through the switching element Can be played.

Further, in the above embodiment, since the reverse voltage blocking diode 18 is connected to the control unit 12 in advance, even if the control unit 12 is connected to the on-vehicle battery 17 in an erroneous polar state, There is no fear that an abnormal voltage will be applied to the control unit 12, and the protection can be ensured.

Although the diode 18 for blocking the reverse voltage is connected to the terminal T8 in the above embodiment, the diode 18 may have the anode connected to the terminal T9. In this case, When the control unit 12 is connected to the power source, the cathode of the diode 18 is connected to the negative terminal of the vehicle-mounted battery 17 (body ground portion in the case of automobile).

Besides, the present invention is not limited to the embodiments described above and shown in the drawings. For example, a bipolar transistor may be used as a semiconductor switching element, and various modifications can be made without departing from the scope of the invention. It can be carried out.

[0047]

[Effect of device]

 As is apparent from the above description, in the control device for the electric door mirror for an automobile according to claim 1, a drive circuit including a plurality of semiconductor switching elements for driving a motor is integrated as a control unit, and Since the control unit is housed in the case for the operation command switch, the overall size of the device can be reduced and the required harness can be reduced.

Further, in the control device for the electric door mirror for an automobile according to claim 2, the power supply terminal of the control unit has a diode for blocking a reverse voltage which is in a forward direction with respect to a power supply voltage input direction of the control unit. Since the control unit is connected, even if the control unit is connected to the power supply in the wrong polarity, the control unit can be protected reliably.

[Brief description of drawings]

FIG. 1 is an electrical configuration diagram showing an embodiment of the present invention.

FIG. 2 is a vertical sectional view of a case for an operation command switch.

FIG. 3 is a plan view of the case.

FIG. 4 is a plan view of an automobile

[Explanation of symbols]

In the drawing, 1 is an automobile, 4 and 5 are door mirrors, 6 and 7 are motors, 8 and 9 are storage position detection switches, 10 and 11 are return position detection switches, 12 is a control unit, 13 is an operation command switch, and 17 is In-vehicle battery, 18 is a diode, 21-28 are FETs (semiconductor switching elements),
29 is a drive circuit, 33 is a protection circuit, 43 is a signal generation circuit, and 57 is a case.

Claims (2)

[Scope of utility model registration request] 1. A motor for reciprocally rotating a door mirror between a retracted position and a retracted position in response to energization in forward and reverse directions,
And a drive circuit having a plurality of semiconductor switching elements that are selectively turned on by operating an operation command switch and forming one of a forward conduction path and a reverse conduction path of the motor through the semiconductor switching elements. In a control device for an electric door mirror for an automobile, a control unit formed by integrating the drive circuit including the semiconductor switching elements into an integrated circuit is provided, and the control unit is housed in a case for the operation command switch. Control system for electric door mirrors for automobiles. 2. The electric vehicle motor vehicle according to claim 1, wherein a diode for blocking a reverse voltage, which is in a forward direction with respect to a power supply voltage input direction of the control unit, is connected to a power supply terminal of the control unit. Door mirror control device.