JP2012171492A - Vehicular submersion detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular submersion detector capable of protecting an operation circuit for electrically or electronically operating each portion of a vehicle in order to prevent the circuit from an operation incapability state due to electrical or electrochemical breakage and protecting the vehicle itself by detecting submersion of the vehicle regardless of the presence or absence of an occupant.SOLUTION: A body ECU 2 is power supplied from a battery B mounted on a vehicle C through a feeder circuit 4, and controls the operations of various electrical apparatuses mounted on the vehicle C. A submersion sensor 3 is connected to a resistance 31 in series and arranged between the feeder circuit 4 (battery electric potential +B) and an earth line. When immersed by submersion of the vehicle C, the submersion sensor 3 generates a voltage according to the resistance 31 by leakage between two terminals 3a, 3b. The generated electric potential (submersion detection signal) of the submersion sensor 3 is input to the feeder control IC 5 and is also applied to a base of a transistor 65. The base current of the transistor 65 is set by the resistance 31.

Description

  The present invention relates to a vehicle inundation detection for detecting inundation into a vehicle in order to protect an operation circuit such as a control circuit that electrically or electronically operates each part of the vehicle from electrical or electrochemical damage. Relates to the device.

  By the way, for example, when an automobile falls into the sea or river, a leak occurs in a power window control circuit due to submergence, the power window motor does not operate, and the window glass cannot be lowered. Therefore, it is possible to detect that the vehicle is underwater with a submergence sensor and forcibly lower the window glass or to manually operate the lowering switch so that the passenger (driver or passenger) can escape from the vehicle. It has been proposed to do so (see Patent Documents 1 to 4).

Japanese Patent No. 3553580 Japanese Patent No. 3535351 Japanese Patent No. 3515380 Registered Utility Model No. 3043616

  According to these techniques, by forcibly or artificially lowering the window glass, the occupant can escape from the interior of the vehicle even if the vehicle sinks into the water, which can contribute to lifesaving. However, in a submerged automobile, the operation circuit is electrically decomposed or damaged due to electromigration, etc. due to leakage from the wiring, or the operation circuit is electrically connected with a short circuit between terminals. Or destroy it. Recent automobiles are equipped with a large number of control boards to improve performance and functions. However, especially in the control boards, the distance between terminals and the distance between wirings is small, so migration or short-circuiting occurs even if water drops are attached. It's easy to do.

  Therefore, the operation circuit of the vehicle and hence the entire vehicle cannot be protected from being submerged, and the vehicle cannot be used thereafter (so-called scrapped vehicle). An inoperable state due to electrical or electrochemical damage of the operating circuit occurs regardless of the presence or absence of a passenger, for example, during parking in a parking lot.

  An object of the present invention is to detect the inundation of a vehicle, thereby making it impossible to operate an operation circuit that electrically or electronically operates each part of the vehicle regardless of the presence or absence of an occupant due to electrical or electrochemical damage. An object of the present invention is to provide a vehicle inundation detection device capable of protecting a vehicle from the state and thus protecting the vehicle. Another object of the present invention is to provide an inundation detection device for a vehicle that can contribute to lifesaving by enabling an occupant to escape from the inside of a vehicle in addition to protecting an operation circuit.

Means for Solving the Problems and Effects of the Invention

In order to solve the above-mentioned problem, the inundation detection device for vehicles according to the present invention includes:
An operation circuit for electrically or electronically operating each part of the vehicle by supplying power from a battery mounted on the vehicle;
A submersion sensor for monitoring whether the operating circuit is in a state of being submerged by detecting inundation of the vehicle;
A power supply control unit that outputs a control signal for switching a power supply switch interposed in a power supply circuit from the battery to the operation circuit based on a signal input from the water immersion sensor;
The power supply control unit outputs a control signal for opening the power supply switch when an inundation detection signal is input from the inundation sensor, and cuts off power supply to the operation circuit.

  According to such an inundation detection device for a vehicle, when the inundation sensor detects inundation into the vehicle, the power supply to the operating circuit is cut off. This protects the operating circuit from inoperability due to electrical damage (eg, short circuit damage) or electrochemical damage (eg, electromigration damage), and thus the entire vehicle.

  In addition, the operation circuit and thus the vehicle can be protected regardless of the presence or absence of a passenger. For example, when the vehicle accidentally falls into the sea or river during operation, the power supply control unit can cut off the power supply to the operating circuit without being operated by the occupant. Moreover, even when there are no passengers in the vehicle as in the case of parking in a parking lot, the power supply control unit can cut off the power supply to the operating circuit.

  Note that as the “immersion sensor”, a kind of conduction switch that outputs an ON signal by connecting (conducting) between terminals when a leak generated between terminals due to flooding is detected can be used. Specifically, a “water immersion sensor” described in Patent Document 1 may be a two-terminal type or a three-terminal type “water immersion sensor”.

  In addition, the “operation circuit for electronically operating each part of the vehicle” includes a traveling ECU (Electronic Control Unit) that controls the traveling of the vehicle, a body ECU that controls electrical devices of the chassis / body system, and various control IC etc. are included. On the other hand, the “operation circuit for electrically operating each part of the vehicle” includes various switch circuits, relay circuits, and the like configured by discrete circuits.

  Furthermore, if the inundation sensor is arranged below the operation circuit (low position of the vehicle), the inundation sensor can detect the inundation into the vehicle before the operation circuit is submerged. In this case, the power feeding control unit and the inundation sensor are mounted on a common wiring board, and the power feeding control unit is covered with a waterproof structure for preventing flooding immediately when the vehicle is flooded, while the flooding sensor is applied to the vehicle. In order to immediately detect the water immersion, an exposed structure may be used. As a result, the water immersion sensor and the power supply control unit can be simply arranged to reduce costs, and it is easy to avoid malfunction (inoperable state) of the operating circuit.

  In such a vehicle inundation detection device, it is desirable that the power supply control unit outputs a control signal for opening the power supply switch when the vehicle is in a non-traveling state and an inundation detection signal is input. .

  As a result, even if the inundation sensor detects inundation of the vehicle while traveling on the road, the power supply to the operation circuit is not cut off. Therefore, malfunction of the operation circuit (runaway) is prevented, and the vehicle is made safe. It can be moved quickly to the place.

Alternatively, a display unit for notifying the occupant that the inundation sensor is in the inundation detection state, and a power supply stop switch operated by the occupant based on the notification by the display unit,
The power supply control unit may output a control signal for opening the power supply switch when the water immersion detection signal is input from the water immersion sensor and the operation signal of the power supply stop switch is input.

  For example, when the inundation sensor detects inundation of the vehicle while traveling on the road, the occupant makes a decision whether to open the power supply switch by notifying the occupant (driver) of that fact. . As a result, the occupant can accurately determine whether to move the vehicle to a safe place and then cut off the power supply to the operating circuit or immediately cut off the power supply to the operating circuit.

  At this time, if the display unit can notify that the operating circuit is in a power supply state from the battery, the occupant can confirm whether or not the above determination has already been made on the display unit, thereby preventing erroneous operation of the power supply stop switch. it can.

  In addition, when the power supply switch is in the open state, an emergency circuit for enabling passengers to get on and off the vehicle can be connected in parallel to the battery with the power supply circuit.

  As a result, even if an occupant is trapped in the vehicle, such as when accidentally falling into the sea or river during driving, the emergency circuit can easily escape the crisis.

  At this time, it is desirable that the emergency circuit includes at least one of a descent drive circuit for a power window motor driven based on a switch operation by an occupant and a lock release drive circuit for a door lock motor.

  As a result, even if the vehicle accidentally falls into the sea or river during driving, the occupant can escape from the exit made in the window glass or door. Therefore, protection of the operating circuit and life saving can be achieved at the same time. In addition, in an emergency circuit, existing switches such as a window lowering switch and a door unlocking switch can be used, and an increase in cost can be suppressed. In the case where a power window motor lowering drive circuit and a door lock motor unlocking drive circuit are provided as emergency circuits, these circuits are preferably connected in parallel to the power feeding circuit.

  Furthermore, the power supply control unit supplies power when there is a signal input due to a predetermined power supply return operation by the occupant after the signal input from the inundation sensor switches from the inundation detection state to the non-detection state. A control signal for closing the switch can be output.

  When the vehicle is submerged, the power supply switch is closed after the power supply return operation is performed, so that the power supply to the operating circuit can be safely restored.

  Specifically, the power supply return operation can be an operation of opening the driver's seat side door and an operation of inserting a start key.

  By making the power supply return condition a plurality of operations, the safety of power restoration to the operating circuit can be further enhanced. In addition, an existing switch such as a driver seat door courtesy switch or a key switch can be used, and an increase in cost can be suppressed.

And in order to solve the said subject, the inundation detection apparatus for vehicles of this invention is the following.
An operation circuit for electrically or electronically operating each part of the vehicle by supplying power from a battery mounted on the vehicle;
A submersion sensor for monitoring whether the operating circuit is in a state of being submerged by detecting inundation of the vehicle;
A power supply switch that is interposed in a power supply circuit extending from the battery to the operation circuit, and that is opened upon detection of water immersion by the water immersion sensor;
It is characterized by providing.

  Even if the inundation detection device for a vehicle is configured as described above, if the inundation sensor detects inundation of the vehicle, the power supply to the operation circuit can be cut off, and the operation circuit and the vehicle are Can be protected. Therefore, it is possible to significantly reduce the cost of the vehicle flood detection device.

BRIEF DESCRIPTION OF THE DRAWINGS Schematic explanatory drawing which illustrates the vehicle provided with the inundation detection ECU as an inundation detection apparatus for vehicles which concerns on this invention. The circuit diagram which shows an example of inundation detection ECU. The flowchart which shows the electric power feeding process in the electric power feeding control IC of FIG. Sectional drawing of inundation detection ECU. The circuit diagram which shows the other example of inundation detection ECU. 6 is a flowchart showing power supply processing in the power supply control IC of FIG. 5. The circuit diagram which shows the further another example of the inundation detection apparatus for vehicles.

Example 1
Hereinafter, embodiments of the present invention will be described with reference to examples shown in the drawings. FIG. 1 is a schematic explanatory view illustrating a vehicle equipped with a flood detection ECU as a vehicle flood detection device according to the present invention. A floor console box F is fixed on the floor surface of the front center portion of the vehicle C shown in FIG. 1, and an inundation detection ECU (Electronic) for detecting inundation into the vehicle C is provided inside the floor console box F. Control Unit) 1 is arranged. In addition, a dashboard D is provided in front and above the floor console box F. Inside the dashboard D, a body ECU 2 (operation circuit) for controlling the chassis / body electrical equipment of the vehicle C is disposed. Has been. That is, the inundation detection ECU 1 located in the floor console box F, for example, at the height of the driver's knee, is more than the body ECU 2 located in the dashboard D, for example, at the height of the driver's chest. It is arranged at a low position (downward) of the vehicle C.

  FIG. 2 is a circuit diagram showing an example of a flood detection ECU. As shown in FIG. 2, the inundation detection ECU 1 detects whether or not the vehicle C is inundated, thereby monitoring whether or not the body ECU 2 can be submerged, and a signal input from the inundation sensor 3. And a power supply control IC 5 (power supply control unit) that outputs a control signal based on the above. The body ECU 2 is supplied with electric power from the battery B mounted on the vehicle C via the power feeding circuit 4 and controls the operation of various electric devices mounted on the vehicle C.

  The water immersion sensor 3 is connected in series with the resistor 31 and is provided between the power supply circuit 4 (battery potential + B) and the ground line. When the inundation sensor 3 is submerged by inundation of the vehicle C, a voltage corresponding to the resistor 31 is generated due to leakage between the two terminals 3a and 3b. The voltage generated by the flooded sensor 3 (flooded detection signal) is input to the power supply control IC 5 and simultaneously applied to the base of a transistor 65 described later. Therefore, the base current of the transistor 65 is set by the resistor 31.

  The power supply control IC 5 is also supplied with a vehicle speed signal input from the vehicle speed sensor 21 to the body ECU 2 and output from the body ECU 2. When the vehicle speed signal from the body ECU 2 is 0 (the vehicle C is in a non-traveling state) and the inundation detection signal is input from the inundation sensor 3, the power supply control IC 5 is interposed in the power supply circuit 4. A control signal for switching the power supply relay switch 41 (power supply switch) to open is output.

  The power supply control IC 5 also receives an operation signal for the key switch 52 based on an operation for inserting a start key and an operation signal for a driver seat door courtesy switch 53 based on an operation for opening the driver seat side door. Then, after the signal input from the inundation sensor 3 is switched from the inundation detection state to the non-detection state, the operation of returning power to the key switch 52 and the driver seat side door courtesy switch 53 is performed by the occupant (driver or passenger). When this occurs, the power supply control IC 5 outputs a control signal for switching the power supply relay switch 41 to the closed state. The voltage adjustment unit 51 adjusts the battery potential + B (for example, +12 V) to a predetermined drive potential (for example, +5 V), and constantly supplies power to the power supply control IC 5.

  Further, in FIG. 2, a lowering drive circuit 6 for lowering the window by the power window mechanism is connected in parallel with the power supply circuit 4 to the battery B. Between the power feeding circuit 4 (battery potential + B) and the ground line, a window lowering switch 61, a window lowering relay coil 62, and a transistor 65 constituting the lowering driving circuit 6 are connected in series. The transistor 65 is an NPN-type emitter-grounded, and when a passenger operates the window lowering switch 61 in a base voltage application state (that is, an inundation detection signal generation state of the inundation sensor 3), the window lowering relay coil 62 is excited, The window lowering relay switch 63 is switched so that the power window motor 66 rotates to the window lowering side. That is, the descent drive circuit 6 is an emergency that enables the passenger to escape from the window (passenger getting on and off the vehicle C) when the power supply relay switch 41 is in the open state (the inundation sensor 3 is in the inundation detection signal generation state). The window lowering switch 61 is an emergency operation switch for that purpose. Therefore, the window lowering switch 61 may be used also as a normal operation switch (not shown) for rotating the power window motor 66 to the window lowering side or the window raising side in a normal state. It may be provided separately as an operation switch dedicated to the escape operation. Reference numeral 64 denotes a flyback diode connected in reverse parallel to the window drop relay coil 62 in order to protect the transistor 65 when OFF.

  As shown in FIGS. 2 and 4, the flooding sensor 3, the resistor 31, the power supply control IC 5, the voltage adjustment unit 51, the window drop relay coil 62, the window drop relay switch 63, the flyback diode 64, and the transistor 65 are formed as a single sheet. It is mounted on the wiring board 10 and constitutes a main part of the water immersion detection ECU 1. The resistor 31, power supply control IC 5, voltage adjustment unit 51, window lowering relay coil 62, window lowering relay switch 63, flyback diode 64, and transistor 65, which are drive system members for the power feeding relay switch 41 and the power window motor 66, While being covered with a waterproof structure for preventing immediate flooding when the vehicle C is flooded, the flood sensor 3 is formed with an exposed structure in order to immediately detect flooding of the vehicle C. Specifically, a waterproof structure such as the power supply control IC 5 is formed by covering (sealing) the entire front and back of the drive system member including the power supply control IC 5 with a covering portion 11 such as a gel substance (for example, silicone). .

  Next, power supply processing by the power supply control IC 5 will be described with reference to the flowchart shown in FIG.

  First, it is determined by the vehicle speed signal from the vehicle speed sensor 21 whether or not the vehicle C is parked or stopped (S1). If the vehicle is parked or stopped (S1: YES), it is determined whether or not the flood sensor 3 is in the flood detection state (S2). If the inundation sensor 3 is in the inundation detection state (S2: YES), the power supply control IC 5 switches the power supply relay switch 41 to open (S3). When the vehicle is not parked or stopped (S1: NO), and when the inundation sensor 3 is in a non-infiltration state (S2: NO), the power supply control IC 5 keeps the power supply relay switch 41 closed (S6). ) End the power supply process.

  Next, it is determined whether the submersion sensor 3 has switched from the submersion detection state to the submersion non-detection state (S4). When the submersion sensor 3 switches from the submersion detection state to the submersion non-detection state (S4: YES), it is then determined whether the driver seat side door courtesy switch 53 and the key switch 52 are inserted (S5). . When an operation to open the driver's side door and an operation to insert a start key is performed (S5: YES), the power supply control IC 5 returns the power supply relay switch 41 to the closed state to return the power supply (S6), and ends the power supply process. To do. On the other hand, when these operations are not performed (S5: NO) and when the inundation sensor 3 remains in the inundation detection state (S4: NO), the process returns to S4 without returning power supply.

  Thus, since the power supply to the body ECU 2 is cut off when the inundation sensor 3 detects inundation into the vehicle C, the body ECU 2 can be protected from damage due to short circuit or damage due to electromigration. Can protect. Moreover, the body ECU 2 and thus the vehicle C can be protected regardless of the presence or absence of a passenger. For example, when the vehicle accidentally falls into the sea or river during operation, the power supply control IC 5 can cut off the power supply to the body ECU 2 without the operation of the passenger. Further, as in the case where the vehicle is parked in the parking lot, the power supply control IC 5 can cut off the power supply to the body ECU 2 even if there is no passenger in the vehicle.

  In addition, since the descent drive circuit 6 is connected in parallel with the power supply circuit 4 for the battery B, even if an occupant is trapped in the vehicle, such as when accidentally falling into the sea or river during driving, the descent drive circuit 6 6 can easily escape from the window. Further, when the vehicle is submerged, the power supply relay switch 41 is closed after the operation for opening the driver's seat side door and the operation for inserting the start key are performed, so that the power supply to the body ECU 2 can be safely performed. It can be restored.

(Example 2)
Next, FIG. 5 is a circuit diagram showing another example of the flood detection ECU. In the inundation detection ECU 1 (vehicle inundation detection device) shown in this embodiment, the occupant is based on the display unit 7 for notifying the occupant that the inundation sensor 3 is in the inundation detection state and the notification by the display unit 7 A power supply stop switch 54 to be operated is provided.

  Therefore, in the flowchart shown in FIG. 6, when the inundation sensor 3 is in the inundation detection state (S2: YES), the power supply control IC 5 displays a warning on the display unit 7 (S21), and the occupant operates the power supply stop switch 54. (S22: YES), the power supply relay switch 41 is switched to open (S3). At this time, for example, a message such as “I was submerged. Please press the power supply stop switch 54 to turn off the power” is displayed repeatedly (or continuously) until the power supply stop switch 54 is operated. The Further, the display unit 7 may also notify whether the body ECU 2 is in a power supply state from the battery B or not.

  Thus, for example, when the inundation sensor 3 detects inundation into the vehicle C while traveling on the road, whether or not to open the power supply relay switch 41 by notifying the occupant (driver) of that fact. The decision is left to the crew. As a result, the occupant can accurately determine whether the power supply to the body ECU 2 is cut after moving the vehicle C to a safe place, or whether the power supply to the body ECU 2 is cut off immediately.

  In the second embodiment (FIGS. 5 and 6), parts having the same functions as those in the first embodiment (FIGS. 1 to 4) are denoted by the same reference numerals, and description thereof is omitted.

(Example 3)
Next, FIG. 7 is a circuit diagram showing still another example of the vehicle inundation detection apparatus. In order to directly explain the principle of the present invention, the inundation detection circuit 1 ′ (vehicle inundation detection device) shown in FIG. 7 is shown in Example 1 (see FIG. 2) and Example 2 (see FIG. 5). It is expressed in a simplified form than the inundation detection ECU 1 and is arranged inside the floor console box F of the vehicle C (see FIG. 1).

  Specifically, the flood detection circuit 1 ′ includes the flood sensor 3 and a relay circuit 60. The inundation sensor 3 is connected in series with the resistor 31 and is provided between the power supply circuit 4 (battery potential + B) for supplying power from the battery B to the body ECU 2 (operation circuit) and the ground line. When the inundation sensor 3 is submerged by inundation of the vehicle C, a voltage corresponding to the resistor 31 is generated due to leakage between the two terminals 3a and 3b. Further, a relay circuit 60 that opens and closes the power supply relay switch 41 (power supply switch) is provided between the power supply circuit 4 (battery potential + B) and the ground line, in addition to the water immersion sensor 3. In the relay circuit 60, a relay coil 62 'and a transistor 65' (NPN type, grounded emitter) are connected in series, and the voltage generated by the submerged sensor 3 is applied to the base of the transistor 65 '.

  Thus, in this embodiment (FIG. 7), since the power supply control IC shown in Embodiment 1 (FIG. 2) and 2 (FIG. 5) is omitted, when the inundation sensor 3 detects the inundation detection state, The power supply relay switch 41 is opened by excitation of the relay coil 62 ′, and the power supply to the body ECU 2 is cut off. Reference numeral 64 'denotes a flyback diode connected in reverse parallel to the relay coil 62' in order to protect the transistor 65 'when OFF.

  Even in this configuration, when the inundation sensor 3 detects inundation of the vehicle C, the power supply to the body ECU 2 can be cut off, and the body ECU 2 and thus the vehicle C can be protected regardless of the presence or absence of a passenger. it can. Therefore, by using the above-described inundation detection circuit 1 'as the inundation detection device, a significant cost reduction can be achieved.

  Further, as shown in FIG. 7, the water immersion sensor 3, the resistor 31, and the relay circuit 60 (relay coil 62 ′, flyback diode 64 ′, transistor 65 ′) are mounted on one wiring board 10 ′. It forms the main part of the inundation detection circuit 1 ′. The resistor 31 and the relay circuit 60 (relay coil 62 ′, flyback diode 64 ′, transistor 65 ′), which are drive system members for the power supply relay switch 41, prevent immediate flooding when the vehicle C is submerged. The water immersion sensor 3 is formed with an exposed structure in order to immediately detect water intrusion into the vehicle C. Specifically, the waterproof structure of the relay circuit 60 and the like is formed by covering (sealing) the entire surface of the resistor 31 and the relay circuit 60 with a covering portion 11 ′ such as a gel substance (for example, silicone).

  In the above embodiment, only the case where the body ECU 2 is an operation circuit has been described. However, another ECU, a single IC, or a discrete circuit may be the operation circuit. Further, the water immersion sensor 3 may be a three-terminal type instead of the two-terminal type shown in each embodiment. Further, as an emergency circuit, when a door unlocking motor unlocking drive circuit is used instead of the power window motor lowering driving circuit 6 shown in the first and second embodiments, or in addition to the power window motor lowering driving circuit 6 There are cases where an unlock driving circuit for the door lock motor is provided, and the occupant can drive (switch operation) these driving circuits simultaneously or one of them. The transistors 65 and 65 'may be of any type such as a bipolar transistor (NPN type or PNP type) or FET.

1 Inundation detection ECU (Inundation detection device for vehicles)
2 Body ECU (actuation circuit)
21 Vehicle speed sensor 3 Inundation sensor 3a, 3b Terminal 31 Resistance 4 Power supply circuit 41 Power supply relay switch (power supply switch)
5 Power supply control IC (Power supply control unit)
51 Voltage Adjustment Unit 52 Key Switch 53 Driver's Seat Side Door Courtesy Switch 54 Power Supply Stop Switch 6 Descent Drive Circuit (Emergency Circuit)
61 Window drop switch (Emergency operation switch)
62 Window drop relay coil 63 Window drop relay switch 64 Flyback diode 65 Transistor 66 Power window motor 7 Display section 10 Wiring board 11 Cover section B Battery C Vehicle D Dashboard F Floor console box

Claims (7)

An operation circuit for electrically or electronically operating each part of the vehicle by supplying power from a battery mounted on the vehicle;
A submersion sensor for monitoring whether the operating circuit is in a state of being submerged by detecting inundation of the vehicle;
A power supply control unit that outputs a control signal for switching a power supply switch interposed in a power supply circuit from the battery to the operation circuit based on a signal input from the water immersion sensor;
The power supply control unit outputs a control signal for opening the power supply switch when an inundation detection signal is input from the inundation sensor, and cuts off the power supply to the operation circuit. Detection device.   2. The vehicle flood detection according to claim 1, wherein the feed control unit outputs a control signal for opening the feed switch when the vehicle is in a non-running state and the flood detection signal is input. apparatus.   3. The vehicle flooding according to claim 1, wherein when the power supply switch is in an open state, an emergency circuit for enabling passengers to get on and off the vehicle is connected in parallel with the power supply circuit with respect to the battery. Detection device.   The emergency circuit includes at least one of a descent drive circuit for a power window motor driven based on a switch operation of an occupant and a lock release drive circuit for a door lock motor. Inundation detection device for vehicles.   When the signal input from the flooding sensor is switched from the flooding detection state to the non-detection state and then a signal input due to a predetermined power feeding return operation performed by the occupant, The inundation detection device for vehicles according to any one of claims 1 to 4 which outputs a control signal for closing a feed switch.   The vehicle inundation detection device according to claim 5, wherein the power supply return operation is an operation of opening a driver's seat side door and an operation of inserting a start key. An operation circuit for electrically or electronically operating each part of the vehicle by supplying power from a battery mounted on the vehicle;
A submersion sensor for monitoring whether the operating circuit is in a state of being submerged by detecting inundation of the vehicle;
A power supply switch that is interposed in a power supply circuit extending from the battery to the operation circuit, and that is opened upon detection of water immersion by the water immersion sensor;
An inundation detection device for a vehicle, comprising:

Images