JP2008148454A - Motor drive circuit and vehicle washer motor drive circuit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor drive circuit wherein the occurrence of short circuit can be prevented even when multiple operations are simultaneously performed with a combination switch. <P>SOLUTION: The motor drive circuit includes a switch unit 50 constructed of a first change-over switch 60, a second change-over switch 70, and a first opening/closing switch 80, in which switch unit change-over is simultaneously carried out, and a second opening/closing switch 90. The circuit is so constructed that the following operation is performed: when the switch unit 50 and the second opening/closing switch 90 are inactive, a motor 40 is stopped; when the switch unit 50 is changed over, the motor 40 is rotated in one direction; and when the second opening/closing switch 90 is changed over, the motor 40 is rotated in the other direction. When multiple operations are simultaneously performed with a combination switch 20, a higher priority is given to circuitry for either rotation in one direction or rotation in the other direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a motor drive circuit, and more particularly, a vehicle washer motor drive circuit suitable for driving a motor of a pump device that rotates forward and reverse to discharge window washer fluid to a front window and a rear window of a vehicle such as an automobile. About.

  2. Description of the Related Art Conventionally, a vehicle such as an automobile includes a pump device that discharges window washer fluid to a window. As such a pump device, there is known a pump device that discharges window washer fluid to one selected window of a front window or a rear window of a vehicle (see, for example, Patent Document 1). A switch device for selecting a front window or a rear window is also disclosed (see, for example, Patent Document 2).

  The pump device and the vehicle washer pump device described in Patent Document 1 have two discharge ports, and are provided with a pump that discharges washer fluid from one selected discharge port, and switches the motor drive circuit. Rotate the motor forward and backward to discharge washer fluid from one of the outlets. In addition, the automotive washer motor switch device described in Patent Document 2 describes a specific switch structure for switching the motor between forward and reverse.

  As shown in FIG. 7, the motor drive circuit 1 described in Patent Literature 1 and Patent Literature 2 includes a pair of contact structures 2 and 3 that can be switched simultaneously, and includes a switch 5 connected to the motor 4. The pair of contact structures 2 and 3 have COM terminals 6 and 7 and a set of connection terminals 8, 9 and 10 and 11, respectively. Then, as shown in FIGS. 8 and 9, the COM switch 6 and the connection terminal 8 are operated by operating the combination switch 12 disposed in the vicinity of the steering wheel 13 from the neutral position, for example, forward (in the direction of arrow A). The COM terminal 7 and the connection terminal 10 are connected to rotate the motor 4 in the forward direction, or the combination switch 12 is operated backward (in the direction of arrow B) to move the COM terminal 6 and the connection terminal 9 and the COM terminal 7 and the connection terminal. 11 is connected to rotate the motor 4 in the reverse direction.

  Thus, in a simple circuit in which the combination switch 12 is operated forward or backward to control forward / reverse rotation of the motor, it is physically impossible that the forward operation and the backward operation of the combination switch 12 are simultaneously performed. There was no room for inconsistencies in circuit connections.

JP 2006-291767 A JP 2001-138874 A

  However, in recent years, combination switches have been diversified by incorporating various control switches such as wiper control, illumination control, and cruising control, and the operation method has become complicated. In order to improve these operability, for example, as shown in FIG. 6, the motor is rotated forward by operating the combination switch 20 forward (in the direction of arrow C) from the neutral position, and the knob 21 is rotated (arrow) from the neutral position. A combination switch has been developed in which the motor is rotated in the reverse direction by moving in the direction D).

  The combination switch 20 operated in this way is provided with a plurality of switches such as a switch (not shown) that can be switched by a forward operation and a switch (not shown) that can be switched by turning the knob 21. A drive circuit is configured. Since the combination switch 20 can perform two simultaneous operations of forward operation and knob rotation, there is a possibility that a plurality of operations are performed in duplicate, and the plurality of switches are switched simultaneously. Therefore, when the forward operation of the combination switch 20 and a plurality of operations of turning the knob are performed simultaneously, depending on the circuit configuration, the connection state of the plurality of switches may be inconsistent, and in an extreme case, a short circuit may occur. There was nothing at all.

  Therefore, as a means to prevent the occurrence of a short circuit, it may be possible to incorporate a mechanism in the combination switch that physically prohibits another operation when one operation is being performed. It was necessary to design a separate duplicate operation prohibition mechanism for each combination switch having different functions, affecting operability and design, which was not practical and would lead to cost increase.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a motor drive circuit and a vehicle that can prevent occurrence of a short circuit even when a plurality of operations are performed simultaneously in the combination switch and the circuit is switched. Another object is to provide a washer motor driving circuit.

The above object of the present invention can be achieved by the following constitution.
(1) a motor provided with a positive terminal and a negative terminal;
A first changeover switch provided with a first common terminal, a first normally open terminal, and a first normally closed terminal, and a second common terminal, a second normally open terminal, and a second normally closed terminal are provided. The second change-over switch, and the first switch having the first terminal and the second terminal, and the first opening / closing switch in which the first terminal and the second terminal are closed in a normal state, A switch unit capable of simultaneously switching the connection state of the three switches;
A second opening / closing switch having a third terminal and a fourth terminal, wherein the third terminal and the fourth terminal are opened in a normal state,
The first common terminal is connected to a power source, the positive terminal of the motor is connected to the first normally open terminal and the second normally closed terminal, and the negative terminal of the motor is the second normally open. A motor connected to the first terminal, the first normally closed terminal connected to the third terminal, the second terminal connected to the fourth terminal, and the second common terminal connected to ground. A drive circuit,
When the switch unit and the second open / close switch are inoperative, the motor is stopped,
When the switch unit is switched, the first common terminal and the first normally open terminal, the second common terminal and the second normally open terminal are closed, and the first terminal and the second normally open terminal are closed. Open the terminals and rotate the motor in one direction,
A motor driving circuit, wherein when the second opening / closing switch is switched, the third terminal and the fourth terminal are closed to rotate the motor in the other direction.

  According to the motor drive circuit having the above-described configuration, the first common terminal of the first changeover switch is connected to the power source, and the positive terminal of the motor is connected to the first normally open terminal of the first changeover switch and the second nose of the second changeover switch. The negative terminal of the motor is connected to the second normally open terminal of the second changeover switch and the first terminal of the first opening / closing switch, and the first normally closed terminal of the first changeover switch is connected to the second terminal. Connect to the third terminal of the changeover switch, connect the second terminal of the first open / close switch to the fourth terminal of the second changeover switch, and connect the second common terminal of the second changeover switch to the ground to configure the motor drive circuit When the switch unit including the first selector switch, the second selector switch, and the first opening / closing switch, and the second opening / closing switch are not operated, the motor is stopped and the switch unit is The motor is rotated in one direction by switching the motor, and the motor is rotated in the other direction by switching the second open / close switch, so that the switch unit and the second open / close switch can be used independently or simultaneously. Even if switched to, there is no connection inconsistency in the circuit, and this can prevent the occurrence of a short circuit.

  (2) The motor drive circuit according to (1), wherein the motor rotates in a forward and reverse direction to rotationally drive a pump device that discharges window washer fluid to a vehicle window.

  According to the motor drive circuit having the above configuration, the pump is rotated in the forward and reverse directions by the motor driven to rotate by the motor drive circuit described in (1), so that the window washer liquid is discharged. Even if operated, there is no circuit failure or short circuit, and a washer pump device that is safe and excellent in operability can be provided.

  According to the motor drive circuit of the present invention, the switch unit including the first changeover switch, the second changeover switch, and the first open / close switch, and the second open / close switch are provided, and when the switch unit and the second open / close switch are inactive. Since the circuit is configured to stop the motor, rotate the motor in one direction by switching the switch unit, and rotate the motor in the other direction by switching the second open / close switch, multiple operations are performed simultaneously on the combination switch. However, there is no connection contradiction in the circuit, which can prevent the occurrence of a short circuit.

  Hereinafter, an embodiment of a vehicle washer pump device suitable for applying a motor drive circuit according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an overall configuration diagram of a vehicle washer pump device to which a motor drive circuit of the present invention is applied. FIG. 2 is a circuit diagram when a combination switch is in a neutral position (non-operation) and a motor is stopped. 4 is a circuit diagram when the switch unit is switched and the motor is rotated forward, FIG. 4 is a circuit diagram when the second open / close switch is switched and the motor is rotated reversely, and FIG. 5 is a switch unit and the second open / close switch are switched simultaneously. FIG. 6 is a side view of a combination switch that can be operated simultaneously with a forward operation and a knob rotation operation.

Here, in the following description, when the combination switch is operated forward, the switch unit is switched, the motor rotates forward, the window washer liquid is discharged to the front window, and the knob of the combination switch is rotated. In this case, it is assumed that the second opening / closing switch is switched so that the motor rotates in reverse and discharges the window washer liquid to the rear window. When the combination switch is not operated and is in the neutral position, the motor stops.
The correspondence relationship between the operation of the combination switch, each switch, and the discharge position of the window washer liquid is not limited to this, and can be arbitrarily set.

  As shown in FIG. 1, a vehicular washer pump device 30 includes a pump 33 attached to a washer tank 32 attached to an engine room in a vehicle 31 and a front for injecting window washer fluid onto a front window 34 of the vehicle 31. A nozzle 35, a rear nozzle 37 for injecting window washer fluid to the rear window 36, a pump 33, a front nozzle 35, a pipe 38 connecting the rear nozzle 37, and a combination switch 20 disposed in the vehicle 31 are provided.

  The pump 33 includes a rotating body (not shown) such as an impeller and two discharge ports (not shown), and is connected to a motor that is driven to rotate forward and backward by a motor drive circuit 100 described in detail later. The vehicle washer pump device 30 operates the combination switch 20 to switch the motor drive circuit 100 to rotate the motor forward and backward, and to selectively inject window washer fluid from the front nozzle 35 or the rear nozzle 37.

  As shown in FIG. 6, the combination switch 20 incorporates a plurality of switches (not shown) and can perform various operations. However, the operation of discharging the window washer fluid is performed by operating the lever forward (in the direction of arrow C). ) And a rotation operation of the knob 21 (in the direction of arrow D). Accordingly, the combination switch 20 related to window washer liquid discharge can be in the following states: (1) neutral position, (2) forward operation from the neutral position, (3) knob rotation operation at the neutral position, and (4) forward There are only four states of simultaneous operation of the operation and knob rotation operation, and other operations (for example, overlapping operation of the neutral position and the forward operation) are physically impossible.

  As shown in FIG. 2, the motor drive circuit 100 includes a switch unit including a motor 40 provided with a positive terminal 41 and a negative terminal 42, a first selector switch 60, a second selector switch 70, and a first opening / closing switch 80. 50 and a second opening / closing switch 90.

  The three switches 60, 70, 80 of the switch unit 50 are switched simultaneously by operating the combination switch 20 forward, and the second opening / closing switch 90 is switched by rotating the knob 21 of the combination switch 20. It is done.

  The first changeover switch 60 is provided with a first common terminal 61, a first normally open terminal 62, and a first normally closed terminal 63. The second changeover switch 70 is provided with a second common terminal 71, a second normally open terminal 72, and a second normally closed terminal 73. The first opening / closing switch 80 has a first terminal 81 and a second terminal 82. When the combination switch 20 is in a neutral position without being operated, that is, in a normal state, the first terminal 81 and the second terminal 82 are provided. Is closed. The second opening / closing switch 90 has a third terminal 91 and a fourth terminal 92, and the third terminal 91 and the fourth terminal 92 are opened in a normal state.

  Each terminal is connected by an electric cable as described below. That is, the first common terminal 61 is connected to the ignition 95 as a power source, the positive terminal 41 of the motor 40 is connected to the first normally open terminal 62 and the second normally closed terminal 73, and the negative terminal 42 of the motor 40 is connected. The first normally closed terminal 63 is connected to the third terminal 91, the second terminal 82 is connected to the fourth terminal 92, and the second common terminal 71 is connected to the second normally open terminal 72 and the first terminal 81. Is connected to the ground 96 to constitute the motor drive circuit 100.

Next, the operation of this embodiment will be described.
When the combination switch 20 is not operated, that is, in the neutral position (see FIG. 6), as shown in FIG. 2, the first changeover switch 60 has a first common terminal 61 and a first normally closed terminal 63. The second switch 70 is closed, and the second common terminal 71 and the second normally closed terminal 73 are closed. The first opening / closing switch 80 is closed and the second opening / closing switch 90 is opened. In the circuit configuration described above, the motor 40 and the ignition 95 are not connected, and the motor 40 stops and no window washer fluid is ejected from either the front nozzle 35 or the rear nozzle 37.

  When the combination switch 20 is operated forward from the neutral position (see FIG. 6), the connection state of the three switches 60, 70, 80 of the switch unit 50 is switched simultaneously as shown in FIG. Specifically, in the first changeover switch 60, the first common terminal 61 and the first normally closed terminal 63 are opened, and the first common terminal 61 and the first normally open terminal 62 are closed. In the second changeover switch 70, the second common terminal 71 and the second normally closed terminal 73 are opened, and the second common terminal 71 and the second normally open terminal 72 are closed. Further, the first opening / closing switch 80 is opened. Thereby, the circuit of the ignition 95, the first common terminal 61, the first normally open terminal 62, the positive terminal 41, the negative terminal 42, the second normally open terminal 72, the second common terminal 71, and the ground 96 of the motor 40. Is formed, and the motor 40 rotates forward, whereby the window washer liquid is ejected from the front nozzle 35.

  When the combination switch 20 is in the neutral position and the knob 21 is rotated in the direction of arrow D (see FIG. 6), the second opening / closing switch 90 is closed as shown in FIG. Ignition 95, first common terminal 61, first normally closed terminal 63, third terminal 91, fourth terminal 92, second terminal 82, first terminal 81, negative terminal 42 of motor 40, positive terminal 41, second A normally closed terminal 73, a second common terminal 71, and a ground 96 circuit are formed, and the motor 40 rotates in the reverse direction, whereby the window washer liquid is ejected from the rear nozzle 37.

Furthermore, the case where duplication operation is carried out with the combination switch 20 is demonstrated here.
When the combination switch 20 is operated forward in the direction of the arrow C and at the same time the knob 21 is rotated in the direction of the arrow D and is overlapped (see FIG. 6), as shown in FIG. The first common terminal 61 and the first normally open terminal 62 are closed, the second changeover switch 70 is closed with the second common terminal 71 and the second normally open terminal 72, and the first opening / closing switch 80 is further closed. Is established. At the same time, the second opening / closing switch 90 is closed. Thereby, the circuit of the ignition 95, the first common terminal 61, the first normally open terminal 62, the positive terminal 41, the negative terminal 42, the second normally open terminal 72, the second common terminal 71, and the ground 96 of the motor 40. Is formed, the motor 40 rotates forward, and the window washer liquid is ejected from the front nozzle 35. At this time, since the connection of other circuits is open, no short circuit occurs. In other words, even if the forward operation of the combination switch 20 and the turning operation of the knob 21 are performed at the same time, the motor 40 is given priority to the forward rotation control, and only the window washer liquid is ejected from the front nozzle 35. Occurrence of failures such as short circuits and breakdowns is prevented.

  The type and structure of the pump are not limited as long as the pump includes two discharge ports and selectively discharges the window washer liquid from any of the discharge ports according to the rotation direction of the motor. A specific example of the structure of the pump is described in detail in, for example, Japanese Patent Application Laid-Open No. 2004-197581. The motor drive circuit may be configured using a relay circuit or a semiconductor element such as an FET.

  According to the motor drive circuit 100 of this embodiment, the switch unit 50 including the first changeover switch 60, the second changeover switch 70, and the first open / close switch 80, and the second open / close switch 90 are provided. When the 2 open / close switch 90 is inactive, the motor 40 is stopped, the motor 40 is rotated in one direction by switching the switch unit 50, and the motor 40 is rotated in the other direction by switching the second open / close switch 90. Since it is configured, there is no connection contradiction in the circuit even if a plurality of operations are performed at the combination switch 20 at the same time, thereby preventing the occurrence of a short circuit.

  Furthermore, the present invention is not limited to the embodiments described above, and modifications, improvements, etc. can be made as appropriate. For example, in the present invention, the forward operation of the combination switch corresponds to the forward rotation of the motor, the knob rotation corresponds to the reverse rotation of the motor, and the forward rotation of the motor is prioritized when the combination switch is operated simultaneously. However, it is not limited, and conversely, the forward operation of the combination switch can correspond to the reverse rotation of the motor, and the knob rotation can correspond to the forward rotation of the motor. In this case, if the knob rotation operation is performed at the neutral position of the combination switch The motor rotates forward. Further, when the forward operation of the combination switch and the knob rotation are operated simultaneously, the motor reverse rotation is prioritized.

1 is an overall configuration diagram of a vehicle washer pump device to which a motor drive circuit of the present invention is applied. FIG. 6 is a circuit diagram when the combination switch is in a neutral position and the motor is stopped. It is a circuit diagram when a switch unit is switched and a motor rotates forward. It is a circuit diagram when a 2nd on-off switch is switched and a motor reversely rotates. It is a circuit diagram when a switch unit and a 2nd opening-and-closing switch are switched simultaneously. It is a side view of the combination switch which can operate forward operation and knob rotation operation simultaneously. It is a conventional motor drive circuit diagram. It is a side view of the conventional combination switch. It is an arrangement view showing an arrangement state of the combination switch.

Explanation of symbols

30 Vehicle washer pump device (pump device)
31 Vehicle 34 Front window 36 Rear window 40 Motor 41 Positive terminal 42 Negative terminal 50 Switch unit 60 First changeover switch 61 First common terminal 62 First normally open terminal 63 First normally close terminal 70 Second changeover switch 71 2 common terminal 72 second normally open terminal 73 second normally closed terminal 80 first open / close switch 81 first terminal 82 second terminal 90 second open / close switch 91 third terminal 92 fourth terminal 95 ignition (power supply)
96 Earth (ground)
100 Motor drive circuit

Claims (2)

A motor provided with a positive terminal and a negative terminal;
A first changeover switch provided with a first common terminal, a first normally open terminal, and a first normally closed terminal, and a second common terminal, a second normally open terminal, and a second normally closed terminal are provided. The second change-over switch, and the first switch having the first terminal and the second terminal, and the first opening / closing switch in which the first terminal and the second terminal are closed in a normal state, A switch unit capable of simultaneously switching the connection state of the three switches;
A second opening / closing switch having a third terminal and a fourth terminal, wherein the third terminal and the fourth terminal are opened in a normal state,
The first common terminal is connected to a power source, the positive terminal of the motor is connected to the first normally open terminal and the second normally closed terminal, and the negative terminal of the motor is the second normally open. A motor connected to the first terminal, the first normally closed terminal connected to the third terminal, the second terminal connected to the fourth terminal, and the second common terminal connected to ground. A drive circuit,
When the switch unit and the second open / close switch are inoperative, the motor is stopped,
When the switch unit is switched, the first common terminal and the first normally open terminal, the second common terminal and the second normally open terminal are closed, and the first terminal and the second normally open terminal are closed. Open the terminals and rotate the motor in one direction,
A motor driving circuit, wherein when the second opening / closing switch is switched, the third terminal and the fourth terminal are closed to rotate the motor in the other direction.   2. The motor drive circuit according to claim 1, wherein the motor rotates in a forward and reverse direction to rotate a pump device that discharges window washer fluid to a vehicle window.

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