JP2002364244A - Drive unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drive unit for a power window, which can reliably prevent an erroneous operation of a motor of the power window, i.e., an erroneous operation of being activated in some direction all by itself, in case of an accident such as vehicle submersion. SOLUTION: The drive unit is comprised of a leakage detecting section 12, and a relay simultaneous driving section 30. The leakage detecting section 12 is conducted upon leakage, and then energized by a detecting current IB1. The relay simultaneous driving section 30 outputs a driving current IG1 for driving a relay for motor positive rotation and a driving current IG2 for driving a relay for motor reverse rotation, according to the detecting current IB fed to the leakage detecting section 12, and simultaneously activates the relay for the motor positive rotation and the relay for the motor reverse rotation. The relay simultaneous driving section 30 is formed of a plurality of transistors 31, 32, 33, and configured so as to output the driving current IG2 by stepwise amplifying the detecting current IB1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving device for driving a motor for opening / closing a power window of a vehicle, and operates when the vehicle is submerged due to a fall of the vehicle to the sea or the like. The present invention relates to a driving device capable of reliably preventing a malfunction from occurring.

[0002]

2. Description of the Related Art In general, in an opening and closing mechanism such as a power window of a vehicle, electronic control for realizing an automatic reversing function of a window is mainly used, and power is appropriately supplied to a motor which is a driving source to perform the operation. A driving system using a relay is generally used as a driving device to be controlled. A conventional basic configuration of this type of driving device is as shown in FIG. 4, for example. Hereinafter, this device will be described. The driving device includes relays 2 and 3 for supplying power to the motor 1 and driving the motor 1 in a forward direction (for example, a direction in which a vehicle window is opened) or a reverse direction (for example, in a direction in which a vehicle window is closed), and a motor. 1 includes switches 4 and 5 (operation switches) for instructing the operation in the forward rotation direction or the reverse rotation direction, a switch 6 for automatic operation, a control circuit 7, and driving transistors 8 and 9.

The relays 2 and 3 are respectively provided with coils 2a and 3a for excitation, a common terminal (hereinafter referred to as C terminal), a normally open terminal (hereinafter referred to as NO terminal), and a normally closed terminal (hereinafter referred to as "terminal"). (Referred to as NC terminals). The NO terminals of these relays 2 and 3 are connected to the positive side (+ B) of the power supply, and the NC terminals are connected to the ground. The C terminal of the relay 2 is connected to the terminal 1a on the side on which the motor rotates forward when connected to the power supply side, of both terminals of the coil of the motor 1. The C terminal of the relay 3 is connected to the terminal 1b on the side on which the motor reversely rotates when connected to the power supply side, of both terminals of the coil of the motor 1.

The switches 4 and 5 each have one contact which is operated by an operation of the driver of the vehicle. For example, a common swingable operation knob (operation unit) is operated in one direction (forward rotation command direction). ), The switch 4 is turned on, and when the swing scanning is performed in the other direction (reverse rotation command direction), the switch 5 is turned on. The switch 6 has a C terminal, a NO1 terminal, and a NO2 terminal. When the operation knob is swung in one direction beyond a specified amount, the NO1 terminal is turned on, and the operation knob is set to the specified amount. When the swing operation is performed in the other direction beyond the NO, the NO2 terminal is turned on. Note that switches 4 and 5 and switch 6
Are usually provided as an integrated switch device. In the case of FIG. 4, the contacts of the switches 4 and 5 are connected to the relays 2 and
3 is provided on a line connecting each of the coils 2a, 3a to the ground, and this line is directly operated to open and close (low-voltage side drive type). In addition, there is also a type (high-pressure side drive type) in which the contacts of the switches 4 and 5 are provided on a line connecting the coils 2a and 3a of the relays 2 and 3 to a power source, and this line is opened and closed.

In the above driving device, the manual operation of the motor 1 is controlled by directly opening and closing one side of the terminals of the coils 2a and 3a of the relays 2 and 3 with the contacts of the switches 4 and 5. That is, for example, when the switch 4 is actuated by the operation of the operation knob in the forward rotation command direction and the contact is closed, current flows through the exciting coil 2a of the relay 2 and only the contact 2b is actuated. C terminal of part 2b and NO
Only the terminal 1a of the motor 1 is connected to the power supply via the terminal, and the motor rotates forward (for example, the window opens).
On the other hand, when the switch 5 is operated and its contact is closed, for example, by the operation of the operation knob in the reverse rotation command direction, current flows through the exciting coil 3a of the relay 3 and the contact 3b.
Only the terminal 1b of the motor 1 is connected to the power supply via the C terminal and the NO terminal of the contact portion 3b, and the motor reversely rotates (for example, the window closes).

Further, for example, the above-mentioned operation knob is operated in the forward rotation command direction beyond the specified amount, and the switch 4 is operated,
Further, when the switch 6 is operated and its NO1 terminal is once turned on, the control circuit 7 determines that the automatic operation in the normal rotation direction has been commanded, and drives the transistor 9 until a stop condition (for example, the fully open window) is satisfied. Keep doing. Thereby, the motor continues to rotate forward until the stop condition is satisfied (for example,
It opens automatically until the window is fully opened.) Conversely, for example, when the operation knob described above is operated in the reverse rotation command direction beyond the specified amount, the switch 5 is operated, and the switch 6 is further operated to turn on its NO2 terminal once, the control circuit 7 is operated in the reverse rotation direction. It is determined that the automatic operation has been commanded, and the transistor 8 continues to be driven until the stop condition (for example, the window is fully closed) is satisfied. As a result, the motor continues to rotate reversely until the stop condition is satisfied (for example, the motor automatically closes until the window is fully closed). The control circuit 7 determines whether the stop condition is satisfied (for example, whether the window is fully opened or fully closed) based on, for example, the output of a motor (not shown) that detects the current of the motor and the rotational position of the motor. Judgment). In the case of a power window in a vehicle, the control circuit 7 detects, for example, a foreign object being caught in the window during an automatic operation in the window closing direction, forcibly stops the motor, reverses the motor, and forcibly turns the window. Often have a function of opening a predetermined amount (automatic reversal function).

The drive device illustrated in FIG. 4 realizes a manual operation by directly opening and closing the energizing line of a relay by switches 4 and 5 operated by operating an operation unit. Then, the signals (terminal voltages) of the switches 4 and 5 are read by the control circuit 7, and the control circuit 7
There is also a type that realizes a manual operation through the above control. In some cases, a plurality of sets of motors and relays for the motors may be provided. For example, a drive device for a power window in a general four-wheeled vehicle includes a driver for window driving, a relay for the above-described relay and a corresponding motor for each of a driver seat, a passenger seat, a rear right seat, and a rear left seat. A drive circuit including a switch and the like is provided in each seat as a separate unit. However, the control circuit 7 described above is often provided only in the driver's seat. In the case of a vehicle power window, the driver's seat unit is provided with an operation unit for operating windows of other seats (passenger seat, rear right seat, and rear left seat) and corresponding switches. In general, a configuration in which a window operation of another seat is also possible. Incidentally, the configuration example in FIG. 4 assumes a main circuit configuration in the driver's seat unit of the power window drive device.

[0008]

In the above-mentioned conventional driving apparatus, for example, when the vehicle falls into the sea or a lake and the apparatus is submerged, depending on the water quality, the operation knob may not be operated even if the operation knob is not operated. A phenomenon (so-called leak) occurs in which a current flows carelessly to any of the contacts of the switches (switches 4, 5 or 6), and the motor 1 is switched in either forward or reverse direction even though the operation knob is not operated. There was a possibility that a malfunction of operating in a certain direction might occur. That is, when the device is submerged, for example, a virtual resistor (resistance RL) is connected in parallel with the contacts of the switches 4 and 5.
Is connected, the leak current flows through the coils 2a and 3a and the voltage (coil voltage VCL) is generated at both ends of each coil even though the operation knob is not operated. I do. The values of the resistance RL and the coil voltage VCL due to the leak are very unstable and fluctuate depending on the state of submersion.

[0009] On the other hand, the operating voltage and the return voltage of the relay usually vary, and slightly differ from relay to relay. For this reason,
For example, when the operating voltage of the relay 3 on the closing side (up side) is lower than the operating voltage of the relay 2 on the opening side (down side), and the coil voltage VCL due to leakage becomes slightly higher than the operating voltage on the up side. In this case, only the relay 3 on the up side is operated, and the motor 1 rotates in the reverse direction and, for example, the window closes. It is conceivable to solve the above problem by using a waterproof structure for the contact of the operation switch, but this is not practically easy. This is because it is very difficult to mold the contact of a normal operation switch because it is necessary to operate the contact by mechanical operation of an operation knob that needs to be exposed in the vehicle.

In order to solve the above problems, the inventors have studied a power window driving device as shown in FIG. 3, for example. Hereinafter, the circuit configuration of this device will be described. However, description of the same elements as in FIG. 4 will be omitted. Also, in FIG. 3, the contacts of the motor and the relay or the switches connected to the control circuit 7 are not shown. The drive device of FIG. 3 is a device in which a hybrid IC (HIC) 11 including the control circuit 7 and the transistors 8 and 9 is mounted on a main board 10 in a driver seat unit in a molded state. The switches 4 and 5 and the relay coils 2a and 3a (for the driver's seat window) are mounted on the main board 10 (outside the HIC 11).
Reference numeral 20 denotes a board in the passenger seat unit. The board 20 for the passenger seat includes the switches 4 and 5 and the switches 2 corresponding to the relay coils 2a and 3a.
4 and 25 and relay coils 22a and 23a (for the front passenger seat window) are mounted. However, the switches 24 and 25 in this case are arranged on the high voltage side of the relay coils 22a and 23a, and are of the high voltage side drive type described above. The configuration of the other seats (the rear right seat and the rear left seat) other than the passenger seat may be the same as that of the passenger seat, and are not shown in FIG. 3 (that is, the rear right seat and the rear seat). As for the left seat, for example, a board similar to the passenger seat board 20 may be provided in the unit of each seat).

A characteristic of the driving device shown in FIG. 3 is that a water-wetting detecting unit 12 which conducts due to water-wetting and in which a detection current flows is provided.
And a relay simultaneous drive unit 13 for simultaneously outputting a drive current for driving each relay according to a detection current flowing through the water wetness detection unit 12 and simultaneously operating each relay. This is the point provided on the main substrate 10. Here, the relay simultaneous driving unit 13 includes a PNP transistor 13a, a circuit line (not shown) for connecting the emitter terminal of the transistor 13a to the positive terminal (+ B) of the power supply,
And a collective drive line L0 that connects the collector terminal of the transistor 13a to each drive line L1 to L4 of each relay. The drive lines of the relays are denoted by L1 to L1 in FIG.
Although only four L4s (only for the driver's seat and the passenger's seat) are shown, in the case of a general vehicle, there are actually eight including the rear seat. In addition, the water wetting detecting unit 12 includes a pair of conductors (water wetting detecting pads 12a, 12a, 12b, 12c) disposed on the main board 10 in the driver's seat (outside the HIC 11) at small intervals and exposed.
12b), one of the conductors (water wettability detection pad 12).
a) is connected to the base terminal of the transistor 13a, and the other conductor (water wetting detection pad 12b) is connected to ground (or the negative side of the power supply).

With the configuration including the water wetting detecting unit 12 and the relay simultaneous driving unit 13, the above-described problem (problem that the motor is actuated beforehand) at the time of submersion in principle is avoided. . This is because, when submersion occurs, the water wetting detection pads 12a, 1
The insulation resistance between 2b decreases, and base current IB (detection current), which is the primary current of transistor 13a, flows. As a result, the transistor 13a is turned on, and the collector current (drive current IG) as the secondary current is supplied to each drive line L.
1 to L4, etc., and the respective relays for normal rotation and reverse rotation operate simultaneously in each seat. For this reason, the window drive motors of the respective seats do not operate in any direction, and are eventually stopped without malfunction.

However, according to recent studies by the present inventors, even in the configuration including the water wetness detecting unit 12 and the relay simultaneous driving unit 13 as described above, the structure is actually submerged for the following reasons. It has been found that the problem of malfunction at the time cannot be prevented with high reliability. That is, depending on the submergence situation, the intrusion of water into the water wetness detection unit 12 is small,
Depending on the difference in impurities contained in water, the transistor 13
In some cases, the base current IB of a does not sufficiently flow, and as a result, a sufficient collector current (drive current IG) of the transistor 13a cannot be obtained. Also, the invading water causes a decrease in insulation resistance between the coil terminal and the like of each relay and the ground, and as a result, a large amount of the drive current IG to be supplied to the coil leaks directly to the ground. For example, in the connector terminals T1 and T2 between the boards shown in FIG. 3, leakage to the ground side is likely to occur. If such a situation (insufficient driving current IG or / and leakage of driving current) occurs, it is not possible to reliably operate all relays, and the window will eventually operate in either direction. It has been found that a malfunction may occur. In particular, when the same countermeasures against water immersion are collectively performed on all the seats including the passenger seat and the rear seat (as illustrated in FIG. 3), a large leak current is likely to occur as a whole, and It has been found that such malfunctions cannot be prevented with high reliability (there is a possibility that the window of any seat will be activated later).

[0014] The principle of preventing malfunctions during submersion in water as described above (method of forcibly driving relays in both forward and reverse directions simultaneously) is disclosed in Japanese Patent Application Laid-Open No. 11-36700. However, the apparatus disclosed in Japanese Patent Application Laid-Open No. 11-36700 has only one motor to be controlled (only the motor for the driver's seat), and the above-described problem that is likely to occur particularly when there are a plurality of motors. Regarding the problem of insufficient driving current and leakage, there is no description in the above publication. Therefore, an object of the present invention is to provide a drive device that can reliably prevent a malfunction in which a motor is operated in any direction in the event of a submergence accident or the like. More preferably, it is another object of the present invention to provide a drive device that can secure high reliability for preventing the above malfunction even if there are a plurality of motors.

[0015]

A drive device according to the present invention has a forward rotation relay and a reverse rotation relay for supplying power to a motor and rotating the motor forward or backward, respectively.
A driving device that operates the forward or reverse rotation relay to drive the motor in the forward or reverse direction according to the operation state of the operation unit or the control unit that commands the operation of the motor, and A water wetness detection unit that conducts and a detection current flows, and outputs a drive current for driving the forward rotation relay and the reverse rotation relay according to the detection current flowing to the water wetness detection unit, and outputs the forward rotation relay and A relay simultaneous driving unit for simultaneously operating the reverse rotation relay, wherein the relay simultaneous driving unit includes a plurality of current amplifying units, and amplifies the detection current in a plurality of stages to output the driving current. In addition, as the current amplifying means constituting the relay simultaneous driving unit, three of a first current amplifying means, a second current amplifying means, and a third current amplifying means are provided, and the detected current is supplied to the first current amplifying means. The secondary current of the first current amplifying means becomes the primary current of the second current amplifying means, the secondary current of the second current amplifying means becomes the primary current of the third current amplifying means, There may be a configuration in which the secondary current of the third current amplifying means is the driving current (that is, a configuration in which the detection current is amplified in three stages to be the driving current). Further, as the current amplifying means, specifically, for example, a transistor can be adopted.

In the drive device according to the present invention, when the device is submerged, a detection current flows to the water wetness detection unit due to the water that has entered due to the submersion. Thereby, a plurality of current amplifying means in the relay simultaneous drive unit operate, amplifying the detection current in a plurality of stages and outputting a drive current for simultaneously driving each relay, and simultaneously operating forward and reverse relays. I do. Therefore, when submerged, the motor does not operate in any direction,
The operation of maintaining the stopped state without malfunction (the effect of preventing the motor from being accidentally moved due to submergence) is realized. In the case of the present invention, even if the detection current is extremely small, the drive current becomes a sufficiently large current obtained by amplifying the detection current in a plurality of stages (for example, three stages).
Even if all the relays for multiple motors are driven collectively, all the relays can be reliably turned on irrespective of the leak condition, etc., and the above operation is much more reliable than before. Can be realized.

In a preferred aspect of the present invention, the sub-wiring board on which at least the first current amplifying means and the second current amplifying means are mounted is mounted on the main wiring board together with elements not mounted on the sub-wiring board. Is what it is. The “sub-wiring board” here may be, for example, a hybrid IC. In this case, by forming the sub-wiring board into a waterproof structure, for example, the relay simultaneous drive unit itself can be prevented from malfunctioning when immersed in water, and as a result, the reliability of realizing the above-described operation is further improved. The reason why only the third current amplifying means may be mounted outside the sub-wiring board is as follows. In other words, if only the third current amplifying means is used, the terminals of the third current amplifying means formed outside the sub-wiring board and the circuit conductors connected to the terminals can all be brought into a high potential state, for example, in the operating state. Therefore, leakage due to submersion hardly occurs in the peripheral portion of the third current amplifying means.

The motor according to the present invention is, for example, a motor for driving an opening / closing body of a vehicle. That is, the present invention
The present invention can be applied to a device for controlling driving of an opening / closing body of a vehicle (for example, a drive device for a power window). Here, the “opening / closing body of the vehicle” may be, for example, a window or a sunroof of the vehicle. As described above, if the drive device of the present invention is applied to a motor for driving a vehicle opening / closing body (power window, sunroof, or the like), even if a vehicle submerges in accident, the opening / closing body will be actuated. Malfunction can be prevented with high reliability, which can contribute to improving the safety of the vehicle.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram illustrating a main part of a circuit configuration of a drive device according to the present embodiment.
The contact points of the relay, the switches connected to the control circuit, and the like are not shown in the figure as in FIG. In the following, the same components as those of the conventional apparatus shown in FIGS. A characteristic of the drive device of the present embodiment is that the drive current IG2 for the other seat is constituted by a plurality of current amplifying means (transistors 31, 32, and 33), amplifying the detection current flowing through the water wetness detection unit 12 in a plurality of stages. The point is that a relay simultaneous driving unit 30 for outputting is provided. Further, in this case, a short-circuit switch (indicated by reference numerals 41 and 51 in FIG. 1) that opens and closes contacts in conjunction with an opening switch (for example, the switch 4 or the switch 24) is provided with a closing relay coil (for example, in each seat). , The relay coil 3a and the relay coil 23a).

The relay simultaneous drive unit 30 includes a plurality of transistors 3 that output a collector current (secondary current) amplified with respect to a base current (primary current) as current amplification means.
1, 32, 33 (first to third current amplifying means).
In this case, the transistors 31, 33 are of the PNP type,
The transistor 32 is an NPN type. The detection current flowing through the water wetting detection unit 12 is the base current (IB1) of the transistor 31 (first current amplification unit), and the collector current of the transistor 31 is the base current (IB2) of the transistor 32 (second current amplification unit). And the driving current IG1 for the driver's seat, and the collector current of the transistor 32 becomes the base current (I
B3), and the collector current of the transistor 33 becomes the driving current IG2 for the other seat. That is, the base terminal of the transistor 31 is connected to the water detection pad 12a.
The emitter terminal of the transistor 31 is connected to the positive terminal (+ B) of the power supply, and the collector terminal of the transistor 31 is connected to the base terminal of the transistor 32 and the driver's seat collective drive line L0X. The emitter terminal of the transistor 32 is connected to the ground,
Are connected to the base terminal of the transistor 33, respectively. The emitter terminal of the transistor 33 is connected to the positive electrode side (+ B) of the power supply,
Are connected to the collective drive line L0Y for the other seat. The collective drive line L0X
Is a line connecting the collector terminal of the transistor 31 to each drive line L1, L2 of each driver for the driver's seat, and the collective drive line L0Y is a line connecting the collector terminal of the transistor 33 to each drive line of each relay for the other seat. L3, L4
And the like. Here, the collective drive line L
0Y is formed outside the HIC 11.

In this case, the transistors 31, 32
The (first and second current amplifying units) are formed and molded in the HIC 11 (sub wiring board), and only the high-capacity transistor 33 is directly mounted on the main substrate 10. In this case, a resistor 34 (a resistor connected between the collector terminal of the transistor 32 and the base terminal of the transistor 33) for setting the magnitude of the base current (IB3) of the transistor 33 is also formed in the HIC 11. If possible, set the transistor 33 to the HIC11
It may be formed inside.

Next, the short-circuit switch 41 for the driver's seat is
It has a C terminal, an NC terminal, and a NO terminal, the C terminal is connected to the power supply side terminal of the coil 3a, the NC terminal is connected to the power supply, and the NO terminal is connected to the coil 3a by the short-circuit line.
a, which is connected to the ground side terminal. This short-circuit switch 41 is connected to the opening direction (DO) of the driver seat window.
When the operation knob is operated in the opening direction to command the operation in the (WN direction), the operation is performed in conjunction with the operation of closing the contact of one switch 4, and the NO terminal is closed. The short-circuit switch 51 for the passenger seat has a C terminal, an NC terminal, and a NO terminal.
The ground terminal 3a is connected to the ground terminal, the NC terminal is connected to the ground, and the NO terminal is connected to the power supply terminal of the coil 3a by the short-circuit line 52. This short-circuit switch 51 is connected to the opening direction (D
When the operation knob is operated in the opening direction to command the operation in the (OWN direction), the operation is performed in conjunction with the operation of closing the contact of one switch 24, and the NO terminal is closed. In this example, although not shown, other seats (rear right seat and rear left seat) other than the passenger seat are also included.
A short-circuit switch similar to that of the passenger seat is provided.

In the driving device of the present embodiment configured as described above, when the device is submerged, the insulation resistance between the water wetting detecting pads 12a and 12b is reduced by the water that has entered due to the submersion, and the base current IB1 ( Detection current)
Flows. As a result, the transistor 31 is turned on,
The collector current (base current IB of transistor 32)
2 and the driving current IG1) for the driver's seat flow, and the transistor 32 is turned on. When the transistor 32 is turned on, the collector current (base current IB3 of the transistor 33) flows. As a result, the transistor 33 is turned on and its collector current (drive current IG
2) flows to each drive line L3, L4, etc., and the relays for normal rotation and reverse rotation operate simultaneously in each seat. Therefore, at the time of submersion, the window drive motor of each seat does not operate in any direction unless the operation unit is operated, and the operation is maintained in a stopped state without malfunction (the operation of any of the windows due to submersion causes the window to move suddenly). (Operation to prevent malfunctioning). In the case of this example, the base current IB
Even if 1 (detection current) is extremely small, the driving current IG2 for the other seat is a sufficiently large current obtained by amplifying the detection current in three stages, and thus all the relays for each seat are driven collectively. In spite of this, each relay can be reliably turned on irrespective of the state of occurrence of the leak, and the above-described operation can be realized with much higher reliability than before.

Further, in the present embodiment, at least the transistors 31 and 32 (first and second current amplifying means) among the plurality of current amplifying means constituting the simultaneous relay driving section 30 are connected to the HIC 11 (sub wiring board). Implemented in
By molding the HIC 11 (sub-wiring board), it is possible to prevent the relay simultaneous drive unit 30 itself from malfunctioning when submerged in water, and as a result, the reliability of realizing the above operation is further improved. In this example, the transistor 33
Only the (third current amplifying means) is mounted outside the HIC 11 (sub wiring board). However, if only the transistor 33 is used, for example, as described above, the resistor 34 is connected to the HIC1
By making the relay simultaneous drive unit 1 erroneous operation due to submergence of the relay simultaneous drive unit 30 can be avoided. If the resistor 34 is inside the HIC 11, the terminals of the transistor 33 formed outside the HIC 11 and the circuit conductors connected to it are all conductors on the high potential side in the operating state (the on state of the transistor 32). This is because leakage due to submersion hardly occurs in the peripheral portion of the transistor 33. The resistance 3
4, the current other than the current IB3 (leakage current)
Is prevented from flowing into the transistor 32.

In the case of this embodiment, since a short circuit composed of the above-mentioned short-circuit switches 41, 51 and the like is provided for each seat, when a submergence accident occurs (the above-described relay simultaneous drive unit) 30 is active)
By operating the operation knob, the contacts such as the switch 4 and the switch 24 are closed, and only the relay for opening the window is operated to rotate the motor forward (open the window) reliably in each seat. That is, for example, the forward rotation direction of the motor 1 for driving the driver's seat window (the opening direction of the window).
When the operation knob of the driver's seat is operated in one direction to instruct the operation of the switch 41, the switch 41 operates in conjunction with the switch 4, and the C terminal and the NO terminal of the switch 41 and the short-circuit line 42 Then, the power supply side terminal and the ground side terminal of the coil 3a of the relay 3 for operating the motor 1 in the reverse direction (window closing direction) are short-circuited, and these terminals always have the same voltage level. Further, at this time, when the switch 4 is closed, a current always flows through the coil 2a of the relay 2 for rotating the motor 1 forward. Therefore, even if a leak occurs due to submersion, if the operation knob is operated in a predetermined direction, only the relay 2 is always activated, the motor rotates forward, and the driver's seat window can be reliably opened. The same applies to windows other than the driver's seat.

In other words, according to the driving apparatus of the present embodiment, even if a submergence accident occurs, the malfunction of the motor of any seat operating in any direction is prevented, and In this case, the motor can be accurately rotated forward in accordance with the operation of the operation knob (in this case, the operation in the forward rotation direction of the motor). Therefore, the driving device of the present embodiment, as in the present embodiment, a motor for opening and closing the power window of the vehicle,
If applied to a sunroof opening / closing motor, even if a vehicle submerges, a power window or sunroof (opening / closing body) can be prevented from malfunctioning when closed, and the opening / closing of these opening / closing bodies can be prevented. Operation can be reliably performed, and escape from the vehicle compartment can be easily and reliably performed, and safety is enhanced.

The present invention is not limited to the above embodiment. For example, in the above embodiment, the arrangement of switch contacts for the driver's seat and the like are illustrated as a low-voltage side drive type, and the arrangement of switch contacts and the like for other seats are illustrated as a high-voltage side drive type. However, the present invention is not limited to this. For example, as shown in FIG. 2, the arrangement of the switch contacts for the passenger seat and the like may be of a low voltage drive type. In this case, those indicated by reference numerals 28 and 29 in FIG. 2 are transistors that perform the same functions as the transistors 8 and 9 described above. Conversely, the arrangement of the switch contacts and the like for the driver's seat can be a high-voltage side drive type. Further, in the above embodiment, only the relay for the other seat is simultaneously driven by the drive current IG2 obtained by amplifying the detection current in a plurality of stages when submerged, but, for example, as shown in FIG. May be driven collectively by the drive current IG amplified in three stages. In this case, as shown in FIG.
The detected current flowing through the transistor 31 becomes the base current (IB1) of the transistor 31 (first current amplifying means),
Is the base current (IB2) of the transistor 32 (second current amplifying means), and the transistor 32
Is the base current (IB3) of the transistor 33 (third current amplifying means), and the transistor 33
Is a drive current IG. The collector terminal of the transistor 33 is connected to the collective drive line L0. The collective drive line L0 connects the collector terminal of the transistor 33 to each drive line L1 to L of each relay.
4 and so on. Further, the plurality of current amplifying units (for example, current amplifying units such as transistors) constituting the relay simultaneous driving unit is not necessarily limited to the configuration in which three are provided.
For example, four or more may be installed.

The control circuit 7 in the above embodiment is
It does not function particularly to prevent the above-mentioned problem at the time of submersion in water, and can be deleted when the above-described automatic operation and control of pinch detection are not performed. In the above embodiment, the operation switches 4, 5 for manual operation are provided.
This is a type in which the energizing line of each relay coil is directly opened / closed by switch contacts such as. However, switch contacts such as operation switches 4 and 5 are connected to the control circuit 7 and manual operation is also performed through control processing of the control circuit 7. Drive control of the motor may be performed. Further, in the above embodiment, for example, a short-circuit circuit is provided only for the coil 3a of the relay 3 for reversely rotating the motor in the driver's seat, and in particular, the operational reliability in the forward rotation direction of the motor (the direction in which the window is opened) is improved. For example, a similar short-circuiting circuit composed of an interlocking switch linked to the switch 5 is provided for the coil 2a of the relay 2 for rotating the motor in the driver's seat in the normal direction, and the motor rotates in the reverse direction (the direction for closing the window, etc.). ) May be improved in operation reliability. However, when a vehicle or the like is submerged, the operation reliability in the direction of opening the window or the like is usually particularly required, and in this sense, such an aspect has relatively little practical significance. In order to prevent a malfunction in which the motor simply starts operating, the short-circuit circuit (short-circuit switch 41 or short-circuit line 4) in the above embodiment can be used.
2) may be deleted.

[0029]

According to the driving device of the present invention, when the device is submerged, the detection current flows to the water wetting detecting portion due to the water that has entered by the submersion. Thereby, a plurality of current amplifying means in the relay simultaneous drive unit are operated, the detection current is amplified in a plurality of stages, and a drive current for simultaneously driving each relay is output, and each of the forward and reverse rotation relays is simultaneously operated. I do. For this reason, at the time of submersion, the motor does not operate in any direction, and an operation of holding the motor in a stopped state without malfunction (operation of preventing the motor from being accidentally moved by submersion) is realized. In the case of the present invention, even if the detected current is extremely small, the drive current becomes a sufficiently large current obtained by amplifying the detected current in a plurality of stages (for example, three stages). Even if all the components are driven collectively, all the relays can be reliably turned on irrespective of the state of occurrence of the leak, and the above-described operation can be realized with much higher reliability than in the past.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a main part of a circuit configuration of a driving device.

FIG. 2 is a diagram illustrating a main part (another embodiment) of a circuit configuration of a driving device.

FIG. 3 is a diagram illustrating a main part (comparative example) of a circuit configuration of a driving device.

FIG. 4 is a diagram showing a circuit configuration of a conventional driving device.

[Explanation of symbols]

Reference Signs List 1 motor 2 relay (forward rotation relay) 3 relay (reverse rotation relay) 2a, 3a, 22a, 23a relay coil 4, 5, 24, 25 switch 7 control circuit (control unit) 10 main board (main wiring board) 11 Hybrid IC (sub wiring board) 12 Water wetting detection unit 30 Relay simultaneous driving unit 31, 32, 33 Transistor (first to third current amplifying means)

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Akihiko Hirata 801 Minami-Fudo-cho, Higashi-iri, Horikawa, Shiokoji-dori, Shimogyo-ku, Kyoto F-term in OMRON Corporation (reference) 2E052 AA09 BA02 CA06 EA11 EB01 GA08 GB11 GD02 KA01 KA15 3D127 AA07 BB01 CB02 CC05 DF03 FF08 FF18 5H570 AA21 BB08 BB09 CC04 DD06 EE01 EE08 HA05 HA07 HB12 LL02 LL32

Claims (4)

[Claims] An operation unit or a control unit that has a forward rotation relay and a reverse rotation relay for supplying power to the motor and rotating the motor forward or backward, respectively, according to an operation state of an operation unit or a control unit that commands operation of the motor. A drive device for operating the forward rotation relay or the reverse rotation relay to drive the motor in a forward rotation direction or a reverse rotation direction, wherein the water wetting detection unit conducts by water wetting and a detection current flows, and the water wetting detection unit A relay simultaneous drive unit that outputs a drive current for driving the forward rotation relay and the reverse rotation relay in accordance with the detected current flowing through the relay, and simultaneously activates the forward rotation relay and the reverse rotation relay; The drive device, comprising: a plurality of current amplifying means, amplifying the detection current in a plurality of stages and outputting the drive current. 2. The current amplifying means includes: a first current amplifying means for outputting a secondary current amplified with respect to a primary current;
A second current amplifying unit; and a third current amplifying unit, wherein the detected current is a primary current of the first current amplifying unit, and a secondary current of the first current amplifying unit is a primary current of the second current amplifying unit. Current, a secondary current of the second current amplifying means becomes a primary current of the third current amplifying means, and a secondary current of the third current amplifying means becomes the driving current. Item 2. The driving device according to Item 1. 3. A sub-wiring board on which at least the first current amplifying means and the second current amplifying means are mounted is mounted on a main wiring board together with elements not mounted on the sub-wiring board. Item 3. The driving device according to Item 2. 4. The driving device according to claim 1, wherein the motor is a motor for driving an opening / closing body of a vehicle.