Power window device

Abstract

To realize a power window device with high safety and reliability, despite its simple circuit configuration.SOLUTION: An operation unit 1 of a power window device 100 has a switch circuit 1A including a series circuit of a manual close switch S3 and resistors R1 to R3, and a switch circuit 1B including a manual open switch S4. An control unit 2 monitors a potential V1 at one end of each of the switch circuits 1A and 1B and a potential V2 at one end of a submersion detection sensor Q independently. Then, when the potential V2 is within a preset submersion potential range, the control unit 2 determines that submersion has occurred. When the vehicle is submerged in water, even if the potential V1 is a potential when an auto close switch S2 or the manual close switch S3 is operated, the control unit 2 does not output a window close command signal for commanding the closing of a window W. On the other hand, when the vehicle is submerged in water, if the potential V1 is a potential when the manual open switch S4 is operated, the control unit 2 outputs a window open command signal to command the window W to be opened.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a power window device that opens and closes a window using a motor, and more particularly to a technique for preventing the window from closing due to erroneous switch operation when a vehicle is submerged in water. [Background technology]

[0002] A power window device installed in a vehicle rotates a motor forward or reverse depending on the operating state of a switch on the operating unit, and opens and closes the window via an opening and closing mechanism installed between the motor and the window. When the switch is operated to the UP side (window close), the motor rotates forward and the window closes, and when the switch is operated to the DOWN side (window open), the motor rotates reverse and the window opens. The forward and reverse rotation of the motor is controlled by switching the direction of the current flowing through the motor.

[0003] Some of these power window devices have a function of detecting submersion and forcibly opening the window by operating a switch to ensure the safety of occupants by enabling them to escape through the window even if the vehicle is submerged and the window cannot be normally opened or closed. Patent documents 1 to 5 describe such power window devices with a submersion detection function.

[0004] The power window devices described in Patent Documents 1 to 4 have a submersion detection sensor consisting of a pair of electrodes spaced apart from each other. The power window device described in Patent Document 5 does not have a submersion detection sensor, but detects submersion based on a comparison result between a voltage at an input terminal of a control unit when a constant current is passed through the input terminal and a threshold value.

[0005] The power window devices of Patent Documents 1 to 4 are provided with a switching element that turns on and off depending on whether or not the submersion detection sensor detects submersion. When the switching element is turned on, the voltage at the input terminal of the control unit changes, and submersion is detected. For this reason, in addition to the submersion detection sensor, a switching element such as a transistor or a relay is required as a means for detecting submersion, which complicates the circuit configuration and makes it impossible to detect submersion if the switching element breaks down. On the other hand, the power window device of Patent Document 5 also requires a constant current circuit to detect submersion, which makes it unavoidable to complicate the circuit configuration, and also makes it impossible to detect submersion if the switching element in the constant current circuit breaks down.

[0006] Furthermore, in a power window device, if the window is closed by mistake when the vehicle is submerged in water, the window closes, making it difficult for the occupants to escape, and thus threatening the safety of the occupants, so measures against this are also necessary. For example, in Patent Document 1, a first switching element that turns on when the detection pad is short-circuited when the vehicle is submerged in water and a second switching element that turns on when the first switching element turns on are provided. When the submersion is detected and each switching element turns on, one end of the window closing switch on the power supply side is grounded to ground by the second switching element. Therefore, even if the window closing switch is operated, no current flows through the switch, and the switch operation is not detected, so that it is possible to prevent the window from closing by mistake when the vehicle is submerged in water. However, in order to realize this function, the above-mentioned switching element is also required, which complicates the circuit configuration. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2018-100507 A [Patent Document 2] Patent No. 6634351 [Patent Document 3] JP 2018-135726 A [Patent Document 4] JP 2019-15115 A [Patent Document 5] JP 2020-87834 A Summary of the Invention [Problem to be solved by the invention]

[0008] An object of the present invention is to provide a power window device which has a simple circuit configuration and yet is highly safe and reliable. [Means for solving the problem]

[0009] The power window device according to the present invention includes an operation unit having a window closing switch operated to close the window and a window opening switch operated to open the window, a motor driving unit for driving a motor for opening and closing the window, a control unit for controlling the operation of the motor driving unit based on the operation of each switch of the operation unit, and a submersion detection circuit for detecting submersion. The operation unit includes a first switch circuit including a series circuit of a window closing switch and a resistor connected between a first power source and a ground, and a second switch circuit including a window opening switch connected in parallel with the first switch circuit between the first power source and a ground. The submersion detection circuit includes a submersion detection sensor connected between the second power source and a ground. The control unit independently monitors a first potential at one end of the first switch circuit and the second switch circuit on the first power source side, and a second potential at one end of the submersion detection sensor on the second power source side. When the second potential is within a preset submersion potential range, the control unit determines that submersion has occurred. In normal times when submersion has not occurred, the control unit outputs a window close command signal to the motor drive unit to command the window to close if the first potential is the potential when the window close switch is operated, and outputs a window open command signal to the motor drive unit to command the window to open if the first potential is the potential when the window open switch is operated. On the other hand, in times of submersion when submersion has occurred, the control unit does not output a window close command signal to the motor drive unit even if the first potential is the potential when the window close switch is operated, and outputs a window open command signal to the motor drive unit if the first potential is the potential when the window open switch is operated.

[0010] According to this, the first potential at one end of the first and second switch circuits and the second potential at one end of the submersion detection sensor are monitored separately by the control unit. Then, when the window open switch is operated during submersion in water, where the second potential is in a range indicating submersion, the window can be opened based on the window open command signal output from the control unit due to the change in the first potential. On the other hand, even if the window close switch is operated by mistake during submersion, the window close command signal is not output from the control unit, so that a situation in which the window is closed and safety is endangered can be avoided. Therefore, a power window device with high safety can be realized that can open the window during submersion and prevent the window from closing due to erroneous operation by a simple circuit configuration without providing a switching element that turns on and off depending on the presence or absence of detection by the submersion detection sensor as in Patent Documents 1 to 4, or a constant current circuit as in Patent Document 5. In addition, a situation in which submersion detection cannot be performed due to a failure of the switching element can be avoided, improving reliability.

[0011] In the present invention, a window close threshold for determining whether or not the window close switch is operated and a window open threshold for determining whether or not the window open switch is operated may be set in the control unit for the first potential, and a submersion threshold for determining whether or not the second potential is submerged may be set in the control unit. In this case, the submersion potential range is a range between the submersion threshold and zero volts, and the window close threshold and the window open threshold may be smaller than the submersion threshold.

[0012] In the present invention, when the control unit determines that submersion has occurred based on the submersion threshold, it may not determine whether the window close switch has been operated based on the window close threshold, but may only determine whether the window open switch has been operated based on the window open threshold.

[0013] In the present invention, the window open threshold may be less than the window close threshold.

[0014] In the present invention, the window closing switch may be composed of a manual closing switch for manually closing the window and an auto-closing switch for automatically closing the window, the window opening switch may be composed of a manual opening switch for manually opening the window and an auto-opening switch for automatically opening the window, and the resistor may be composed of a first voltage dividing resistor, a second voltage dividing resistor, and a third voltage dividing resistor. In this case, the first switch circuit includes the auto-opening switch, the auto-closing switch, the manual closing switch, the first voltage dividing resistor, the second voltage dividing resistor, and the third voltage dividing resistor, and the second switch circuit includes the manual opening switch. In the first switch circuit, a series circuit of the manual closing switch, the first voltage dividing resistor, the second voltage dividing resistor, and the third voltage dividing resistor, a series circuit of the auto-closing switch, the first voltage dividing resistor, and the second voltage dividing resistor, and a series circuit of the auto-opening switch and the first voltage dividing resistor are each connected between a first power source and a ground. In the second switch circuit, the manual opening switch is connected between a first power source and a ground.

[0015] In the present invention, the operation unit may have a first terminal to which one end of each of the first switch circuit and the second switch circuit is connected, and a second terminal to which one end of the submersion detection sensor is connected. The control unit may have a third terminal connected to the first terminal by a first wire, and a fourth terminal connected to the second terminal by a second wire. The third terminal is connected to a first power source via a first pull-up resistor, and the fourth terminal is The second wire, the second terminal, and The third terminal may be connected to a second power supply via a second pull-up resistor. The control unit monitors the potential of the third terminal as a first potential, and monitors the potential of the fourth terminal as a second potential. Effect of the Invention

[0016] According to the present invention, it is possible to realize a power window device that has a simple circuit configuration and yet is highly safe and reliable. [Brief description of the drawings]

[0017] [Figure 1] 1 is a circuit diagram showing a first embodiment of the present invention. [Diagram 2]FIG. 13 is a diagram illustrating a determination threshold value that is normally used. [Diagram 3] FIG. 13 is a diagram illustrating a determination threshold value used when the item is submerged in water. [Figure 4] 4 is a diagram showing a first potential and a second potential in a normal state. FIG. [Diagram 5] 4 is a diagram showing a first potential and a second potential when submerged in water. FIG. [Figure 6] FIG. 4 is a circuit diagram showing a second embodiment of the present invention. [Figure 7] FIG. 11 is a circuit diagram showing a third embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] An embodiment of the present invention will be described with reference to the drawings. Fig. 1 shows a power window device according to the first embodiment. The power window device 100 includes an operation unit 1, a control unit 2, and a motor drive unit 3. The operation unit 1 and the control unit 2 are each unitized, and are electrically connected to each other by wiring L1, L2 such as a cable.

[0019] The operation unit 1 includes a switch circuit 1A (first switch circuit), a switch circuit 1B (second switch circuit), a submersion detection circuit 10, a terminal T1 (first terminal), and a terminal T2 (second terminal). The control unit 2 includes a CPU 4, a pull-up resistor Ra (first pull-up resistor), a terminal T3 (third terminal), and a terminal T4 (fourth terminal).

[0020] In the control unit 2, one end of the pull-up resistor Ra is connected to a power source B1 (first power source), and the other end of the pull-up resistor Ra is connected to a terminal T3. The terminal T3 is connected to a terminal T1 of the operation unit 1 by a wiring L1 (first wiring). Moreover, the terminal T4 is connected to a terminal T2 of the operation unit 1 by a wiring L2 (second wiring).

[0021] In the operation unit 1, one end of each of the switch circuits 1A and 1B is connected to a terminal T1, and the other end of each of the switch circuits 1A and 1B is connected to ground G. That is, the switch circuits 1A and 1B are connected in parallel between a power source B1 and ground G. The submersion detection circuit 10 is made up of a series circuit of a pull-up resistor Rb (second pull-up resistor) and a submersion detection sensor Q, and is connected between a power source B2 (second power source) and ground G. One end of the submersion detection sensor Q on the power source B2 side is connected to the terminal T2. The submersion detection sensor Q is made up of, for example, a pair of electrodes (pads) arranged at an interval on a substrate.

[0022] In addition, although power supply B1 and power supply B2 are distinguished in Fig. 1, they may be the same power supply. Furthermore, the resistance values ​​of pull-up resistor Ra and pull-up resistor Rb may be the same or different. For convenience, the voltage of power supply B1 will be written as B1 and the voltage of power supply B2 will be written as B2 below.

[0023] In the operation unit 1, the switch circuit 1A has switches S1 to S3 and resistors R1 to R3. The switch S1 is an auto-open switch for automatically opening the window, and the switch S2 is an auto-close switch for automatically closing the window. The switch S3 is a manual close switch for manually closing the window. The resistors R1 to R3 are voltage-dividing resistors connected in series.

[0024] The switch circuit 1B has a switch S4. The switch S4 is a manual opening switch for manually opening a window. The auto-opening switch S1 and the manual-opening switch S4 are examples of the "window opening switch" in the present invention, and the auto-closing switch S2 and the manual-closing switch S3 are examples of the "window closing switch" in the present invention.

[0025] In the case of the auto-open switch S1, the window continues to open even if the operation is released after operation, whereas in the case of the manual-open switch S4, the window opens only while the operation state is maintained, and the window opening operation stops when the operation is released. Also, in the case of the auto-close switch S2, the window closes only while the operation state is maintained, and the window closing operation stops when the operation is released, whereas in the case of the manual-close switch S3, the window closes only while the operation state is maintained, and the window closing operation stops when the operation is released.

[0026] In the switch circuit 1A, a series circuit of a manual close switch S3, a resistor R1 (first voltage dividing resistor), a resistor R2 (second voltage dividing resistor), and a resistor R3 (third voltage dividing resistor) is connected between a terminal T1 and a ground G. Also, a series circuit of an auto close switch S2, a resistor R1, and a resistor R2 is connected between the terminal T1 and a ground G. Furthermore, a series circuit of an auto open switch S1 and a resistor R1 is connected between the terminal T1 and a ground G.

[0027] In the switch circuit 1B, the manual open switch S4 is connected between the terminal T1 and the ground G. The terminal T1 is connected to the power source B1 via the line L1, the terminal T3, and the pull-up resistor Ra. T4 teeth, Wire L2, terminal T2, and It is connected to a power supply B2 via a pull-up resistor Rb.

[0028] In the control unit 2, the input side of the CPU 4 is connected to the connection point between the pull-up resistor Ra and the terminal T3, and to the terminal T4. The CPU 4 independently monitors the potential V1 (first potential) of the terminal T3 and the potential V2 (second potential) of the terminal T4, and controls the motor drive unit 3 based on the results (details will be described later).

[0029] The motor drive unit 3 is configured from known circuits including a PWM circuit that generates a PWM (Pulse Width Modulation) signal, and a switching circuit that performs switching operation based on this PWM signal.

[0030] In this embodiment, the motor 5 is a DC motor, and rotates at a predetermined speed based on the drive voltage output from the motor drive unit 3. When the auto close switch S2 or manual close switch S3 is operated in the operation unit 1, a window close command signal commanding to close the window is output from the control unit 2 (CPU 4), ​​and based on this command signal, the motor 5 rotates forward to close the window W. When the auto open switch S1 or manual open switch S4 is operated in the operation unit 1, a window open command signal commanding to open the window is output from the control unit 2 (CPU 4), ​​and based on this command signal, the motor 5 rotates reversely to open the window W. An opening and closing mechanism (not shown) is provided between the motor 5 and the window W.

[0031] Although not shown in Figure 1, the control unit 2 performs feedback control on the motor drive unit 3 based on the output of a sensor (such as a rotary encoder) that detects the rotational speed of the motor 5 so that the rotational speed of the motor 5 becomes a target speed.

[0032] Next, the detection of submersion in water, which is a feature of the present invention, will be described in detail with reference to FIGS.

[0033] As described above, the CPU 4 of the control unit 2 independently monitors the potential V1 of the terminal T3 and the potential V2 of the terminal T4. Since the terminals T3 and T4 are connected to the terminals T1 and T2, respectively, the potential V1 is the potential of one end of the switch circuits 1A and 1B on the power supply B1 side, and the potential V2 is the potential of one end of the submersion detection sensor Q on the power supply B2 side. In the control unit 2, a threshold value for determining whether or not the switches S1 to S4 are operated is set for the potential V1, and a threshold value for determining whether or not the submersion is present is set for the potential V2. Each threshold value is stored in advance in an internal memory (not shown) built into the CPU 4 or an external memory (not shown) provided separately from the CPU 4.

[0034] 2 shows the determination thresholds used in normal operation (when not submerged). Here, four thresholds Xa to Xd are set for potential V1 between power supply voltage B1 and zero volts, and one threshold Ya is set for potential V2 between power supply voltage B2 and zero volts. Note that power supply voltages B1 and B2 are the same value.

[0035] Among the thresholds set for the potential V1, Xa is a window close threshold for determining whether the manual close switch S3 has been operated. Xb is a window close threshold for determining whether the auto close switch S2 has been operated. Xc is a window open threshold for determining whether the auto open switch S1 has been operated. Xd is a window open threshold for determining whether the manual open switch S4 has been operated.

[0036] The CPU 4 compares the potential V1 with each of the threshold values ​​Xa to Xd, and determines that the manual close switch S3 has been operated if Xa≧V1>Xb, determines that the auto close switch S2 has been operated if Xb≧V1>Xc, determines that the auto open switch S1 has been operated if Xc≧V1>Xd, and determines that the manual open switch S4 has been operated if Xd≧V1≧0.

[0037] On the other hand, Ya set for potential V2 is a submersion threshold for determining whether or not submersion has occurred. The area Z between Ya and zero volts (Ya≧Z≧0) indicates the submersion potential range. The CPU 4 compares potential V2 with submersion threshold Ya, and if Ya≧V2≧0 (i.e., V2 is within submersion potential range Z), it determines that submersion has occurred. Note that the above-mentioned four thresholds Xa to Xd for potential V1 are smaller than submersion threshold Ya (Ya>Xa>Xb>Xc>Xd).

[0038] Fig. 3 shows the determination thresholds used when the power window device 100 is submerged in water. When the power window device 100 is submerged in water, only the threshold value Xd for determining whether the manual opening switch S4 is operated or not is set for the potential V1 between the power supply voltage B1 and zero volts. This threshold value Xd is the same as the threshold value Xd in Fig. 2. Moreover, the same submersion threshold value Ya as in Fig. 2 is set for the potential V2.

[0039] Under normal circumstances, the CPU 4 of the control unit 2 determines whether or not each of the switches S1 to S4 has been operated, and also determines whether or not the device has been submerged in water, in the manner described above, based on the results of comparing the potentials V1, V2 with the respective thresholds in Fig. 2. If it is determined that the device has been submerged in water, the CPU 4 determines whether or not the switch has been operated and whether or not the device has been submerged in water, using the determination thresholds in Fig. 3 instead of the determination thresholds in Fig. 2.

[0040] 3, while the submerged state continues, the potential V2 is in the range Ya≧V2≧0. At this time, for the potential V1, the operation status of the automatic opening switch S1, the automatic closing switch S2, and the manual closing switch S3 is not judged, and only the operation status of the manual opening switch S4 is judged based on a comparison between the potential V1 and a threshold value Xd. When the CPU 4 judges that the manual opening switch S4 has been operated (Xd≧V1≧0), it outputs a window opening command signal to the motor drive unit 3 to command the window W to be manually opened.

[0041] Fig. 4 shows how the potentials V1 and V2 change under normal circumstances. Since the potential V1 is the potential of terminal T3, the potential V1 changes when the switches S1 to S4 connected to terminal T3 are turned on. On the other hand, since the potential V2 is the potential of terminal T4, the potential V2 does not change when the switches S1 to S4 are turned on, and the potential V2 is determined by the detection state of the submersion detection sensor Q connected to terminal T4. Under normal circumstances when submersion is not detected, there is no short circuit between the electrodes of the submersion detection sensor Q, so the potential V2 in Fig. 4 is in the range B2 ≧ V2 > Ya.

[0042] In FIG. 4, when none of the switches S1 to S4 are operated, the potential V1 is B1≧V1>Xa (OFF state). Now, when the automatic opening switch S1 is operated and turned on, the potential V1 drops to Vs1. At this time, Vs1 is as follows from FIG. Vs1 = B1 R1 / (Ra + R1) For convenience, the resistance of the switch S1, the wiring L1, etc. is ignored (the same applies to Vs2, Vs3, Vs1' to Vs3' described later). If Vs1 is within the range of Xc ≥ Vs1 > Xd, the CPU 4 determines that the automatic opening switch S1 has been operated, and outputs a window opening command signal to the motor drive unit 3 to command the window W to automatically open.

[0043] In addition, in FIG. 4, when the automatic closing switch S2 is operated and turned on, the potential V1 drops to Vs2. At this time, Vs2 is as follows from FIG. Vs2 = B1 (R1 + R2) / (Ra + R1 + R2) If Vs2 is within the range of Xb≧Vs2>Xc, the CPU 4 determines that the auto-close switch S2 has been operated, and outputs a window close command signal to the motor drive unit 3 to command the window W to automatically close.

[0044] In addition, in FIG. 4, when the manual close switch S3 is operated and turned on, the potential V1 drops to Vs3. At this time, Vs3 is as follows from FIG. Vs3=B1·(R1+R2+R3) / (Ra+R1+R2+R3) If Vs3 is within the range of Xa≧Vs3>Xb, the CPU 4 determines that the manual close switch S3 has been operated, and outputs a window close command signal to the motor drive unit 3 to command the window W to be manually closed.

[0045] 4, when the manual opening switch S4 is turned on, the potential V1 drops to Vs4. If the total resistance of the switch S4, the wiring L1, etc. is Rx, then Vs4 is Vs4 = B1 Rx / (Ra + Rx) Here, Rx is a value sufficiently smaller than Ra (Ra>>Rx). If Vs4 is within the range of Xd>>Vs4>>0, the CPU 4 determines that the manual open switch S4 has been operated, and outputs a window open command signal to the motor drive unit 3 to command the window W to be manually opened.

[0046] Fig. 5 shows how the potentials V1 and V2 change when the device is submerged in water. In the operation unit 1 (Fig. 1), the switches S1 to S4 have a waterproof structure that prevents water from entering, but the terminal T1 is exposed to the outside, and the terminal T3 of the control unit 2 is also exposed to the outside (similar to terminals T2 and T4). Therefore, when a leakage current occurs at the terminals T1 and T3 due to submersion in water, the current flowing through the switch circuits 1A and 1B decreases, and the potential V1 becomes lower than in the normal state in Fig. 4. Furthermore, when the device is submerged in water, the electrodes of the submersion detection sensor Q are short-circuited, and the potential V2 also becomes lower than in the normal state in Fig. 4.

[0047] In FIG. 5, when none of the switches S1 to S4 are operated, the potentials V1 and V2 are B1≧V1>Xd and Ya≧V2≧0, respectively. In this state, when the automatic opening switch S1 is operated and turned on, the potential V1 drops to Vs1', when the automatic closing switch S2 is operated and turned on, the potential V1 drops to Vs2', and when the manual closing switch S3 is operated and turned on, the potential V1 drops to Vs3'. However, since no threshold is set for these switches S1 to S3, the presence or absence of operation is not determined (OFF state). In other words, in the submerged state, the operation of the switches S1 to S3 is ignored. Therefore, even if the potential V1 is the potential Vs2' or Vs3' when the automatic closing switch S2 or the manual closing switch S3 is operated when submerged, the window close command signal is not output from the CPU 4 to the motor drive unit 3, and the window W does not close.

[0048] On the other hand, when the manual opening switch S4 is operated and turned on while the window W is submerged in water, the potential V1 drops to Vs4'. Since a threshold value Xd is set for this switch S4, if Xd ≥ Vs4' ≥ 0, the CPU 4 determines that the manual opening switch S4 has been operated and outputs a window opening command signal to the motor drive unit 3 to command the window W to be opened manually.

[0049] Therefore, if the vehicle is submerged, it is possible to open the window W and escape by operating the manual open switch S4. Also, if the auto close switch S2 or manual close switch S3 is operated when the vehicle is submerged, these operations are ignored, so it is possible to avoid a situation in which the window W closes and escape becomes impossible.

[0050] When the submerged state is resolved, the electrodes of the submerged detection sensor Q return to a non-short circuit state, so the potential V2 rises and B2≧V2>Ya holds in Fig. 5. At this time, the CPU 4 determines that the state has changed from submerged to non-submerged, and switches the determination threshold in Fig. 3 to the determination threshold in Fig. 2. This causes the process based on the normal determination threshold described above to be performed.

[0051] According to the embodiment described above, the potential V1 at one end of each of the switch circuits 1A and 1B and the potential V2 at one end of the submersion detection sensor Q are separately monitored by the CPU 4. When the potential V2 is within the submersion potential range Z and the potential V1 indicates the operation of the manual open switch S4, the CPU 4 outputs a window open command signal to the motor drive unit 3.

[0052] Therefore, when the manual open switch S4 is operated during submersion in water where the potential V2 is in the submersion potential range Z, the window W can be opened based on the window open command signal output from the CPU 4 due to the change in the potential V1. On the other hand, even if the auto close switch S2 or the manual close switch S3 is operated by mistake during submersion in water, the window close command signal is not output from the CPU 4, so that it is possible to avoid a situation in which the window W is closed and safety is endangered. Therefore, it is possible to realize a highly safe power window device that can open the window during submersion in water and prevent the window from closing due to an erroneous operation by a simple circuit configuration without providing a switching element (Patent Documents 1 to 4) that turns on and off depending on the presence or absence of detection by the submersion detection sensor Q, or a constant current circuit (Patent Document 5). In addition, it is possible to avoid a situation in which submersion detection cannot be performed due to a failure of the switching element, improving reliability.

[0053] In the power window device market, there are needs that do not require the above-mentioned submersion detection function. In this case, in the power window device 100 of Fig. 1, the submersion detection circuit 10 and the terminal T2 are omitted from the operation unit 1, and the terminal T4 is omitted from the control unit 2. Therefore, the wiring L2 connecting the terminal T2 and the terminal T4 is not necessary, and the harness can be reduced.

[0054] Fig. 6 shows a power window device 200 according to a second embodiment of the present invention. Fig. 6 differs from Fig. 1 in that a switch circuit 1A is composed of only a series circuit of a manual close switch S3 and a voltage dividing resistor R4. The configuration of a switch circuit 1B is the same as Fig. 1, and other configurations are also the same as Fig. 1.

[0055] That is, in the second embodiment, the automatic opening switch S1 and the automatic closing switch S2 are removed and the resistors R1 to R3 are replaced with a resistor R4 in the switch circuit 1A in Fig. 1. In the second embodiment, the thresholds Xb and Xc in Fig. 2 are omitted. With such a second embodiment, the same effects as those of the first embodiment can be obtained.

[0056] Fig. 7 shows a power window device 300 according to a third embodiment of the present invention. Fig. 7 differs from Fig. 1 in that a switch circuit 1A is composed of only a series circuit of an auto-close switch S2 and a voltage dividing resistor R5, and a switch circuit 1B is composed of an auto-open switch S1. The other configurations are the same as those in Fig. 1.

[0057] That is, in the third embodiment, the automatic opening switch S1, the manual closing switch S3, and the resistor R3 are removed from the switch circuit 1A in Fig. 1, the resistors R1 and R2 are replaced with a resistor R5, and the manual opening switch S4 is replaced with the automatic opening switch S1 in the switch circuit 1B in Fig. 1. In the third embodiment, the thresholds Xa and Xd in Fig. 2 are omitted, and the window W opens when the automatic opening switch S1 is operated in a submerged state (Xc ≥ V1 ≥ 0). With this third embodiment, the same effects as those of the first and second embodiments can be obtained.

[0058] In the present invention, various embodiments other than the above-described embodiment can be adopted.

[0059] For example, in the above-described embodiment, the water damage detection circuit 10 is provided in the operation unit 1, but the water damage detection circuit 10 may be provided in the control unit 2. Alternatively, the water damage detection circuit 10 may be provided separately from the operation unit 1 and the control unit 2.

[0060] In the above embodiment, the pull-up resistor Rb is provided in the operation unit 1, but the pull-up resistor Rb may be provided in the control unit 2.

[0061] In the above-described embodiment, the motor drive unit 3 is provided separately from the control unit 2. However, the motor drive unit 3 may be incorporated in the control unit 2.

[0062] Further, in the above-described embodiment, an example has been given in which the motor 5 is provided outside the power window devices 100, 200, 300, but the motor 5 may be provided in the power window devices 100, 200, 300.

[0063] Furthermore, in the above-described embodiments, the power window devices 100, 200, and 300 for vehicles are given as examples, but the present invention can also be applied to power window devices used in fields other than vehicles. [Explanation of symbols]

[0064] 1 Control section 1A Switch circuit (first switch circuit) 1B Switch circuit (second switch circuit) 2. Control section 3 Motor drive unit 4 CPU 5 Motor 10. Water Submersion Detection Circuit 100, 200, 300 Power window device T1 terminal (first terminal) T2 terminal (second terminal) T3 terminal (third terminal) T4 terminal (4th terminal) B1 power supply (1st power supply) B2 power supply (second power supply) L1 wiring (first wiring) L2 wiring (second wiring) R1 Voltage divider resistor (first voltage divider resistor) R2 Voltage divider resistor (second voltage divider resistor) R3 Voltage divider resistor (third voltage divider resistor) Ra Pull-up resistor (first pull-up resistor) Rb Pull-up resistor (second pull-up resistor) S1 Auto-open switch (window open switch) S2 Auto-close switch (window close switch) S3 Manual close switch (window close switch) S4 Manual opening switch (window opening switch) V1: Potential at one end of the switch circuit (first potential) V2: Electric potential at one end of the water immersion detection sensor (second electric potential) Q Submersion Detection Sensor W Window Ya Submersion Threshold Xa, Xb Window closure threshold Xc, Xd Window opening threshold Z Submerged potential range

Claims

1. an operating unit provided with a window closing switch operated when closing a window and a window opening switch operated when opening a window; a motor driving unit that drives a motor for opening and closing the window; A control unit that controls an operation of the motor drive unit based on an operation of each switch of the operation unit; A submersion detection circuit for detecting submersion in water, The operation unit includes: a first switch circuit including a series circuit of the window closing switch and a resistor, the first switch circuit being connected between a first power supply and a ground; a second switch circuit including the window switch, the second switch circuit being connected in parallel with the first switch circuit between the first power supply and ground; the submersion detection circuit includes a submersion detection sensor connected between a second power source and a ground; The control unit is a first potential at one end of the first switch circuit and the second switch circuit on the first power source side and a second potential at one end of the submersion detection sensor on the second power source side are independently monitored; determining that submersion has occurred when the second potential is within a preset submersion potential range; Under normal circumstances when there is no flooding, If the first potential is a potential when the window close switch is operated, a window close command signal is output to the motor drive unit to command the window to be closed; If the first potential is a potential when the window opening switch is operated, a window opening command signal is output to the motor driving unit to command the motor driving unit to open the window; When submersion occurs, Even if the first potential is a potential when the window close switch is operated, the window close command signal is not output to the motor drive unit, a window opening command signal outputted to the motor drive unit when the first potential is a potential when the window opening switch is operated.

2. 2. The power window device according to claim 1, A window closing threshold for determining whether or not the window closing switch is operated and a window opening threshold for determining whether or not the window opening switch is operated are set in the control unit with respect to the first potential, A submersion threshold for determining whether or not the second potential is submerged is set in the control unit, the submersion potential range being between the submersion threshold and zero volts; The power window device according to claim 1, wherein the window closing threshold and the window opening threshold are smaller than the submersion threshold.

3. 3. The power window device according to claim 2, The control unit, when determining that submersion has occurred based on the submersion threshold, does not determine whether the window close switch has been operated based on the window close threshold, but only determines whether the window open switch has been operated based on the window open threshold.

4. The power window device according to claim 2 or 3, A power window device, wherein the window opening threshold is smaller than the window closing threshold.

5. 5. The power window device according to claim 1, The window closing switch includes a manual closing switch for manually closing the window and an auto-closing switch for automatically closing the window, The window opening switch includes a manual opening switch for manually opening the window and an automatic opening switch for automatically opening the window, the resistors include a first voltage dividing resistor, a second voltage dividing resistor, and a third voltage dividing resistor; the first switch circuit includes the auto-open switch, the auto-close switch, the manual close switch, the first voltage dividing resistor, the second voltage dividing resistor, and the third voltage dividing resistor; the second switch circuit includes the manual opening switch; In the first switch circuit, a series circuit of the manual close switch, the first voltage dividing resistor, the second voltage dividing resistor, and the third voltage dividing resistor, a series circuit of the auto close switch, the first voltage dividing resistor, and the second voltage dividing resistor, and a series circuit of the auto open switch and the first voltage dividing resistor are each connected between the first power supply and ground, In the second switch circuit, the manual opening switch is connected between the first power supply and ground.

6. 6. The power window device according to claim 1, the operation unit has a first terminal to which one end of the first switch circuit and one end of the second switch circuit are connected, and a second terminal to which one end of the water submersion detection sensor is connected, the control unit has a third terminal connected to the first terminal by a first wiring and a fourth terminal connected to the second terminal by a second wiring; the third terminal is connected to the first power supply via a first pull-up resistor, and the fourth terminal is connected to the second power supply via the second wiring, the second terminal, and a second pull-up resistor; The power window device according to claim 1, wherein the control unit monitors the potential of the third terminal as the first potential and monitors the potential of the fourth terminal as the second potential.

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