Anti-theft device

Abstract

To suppress a thief from starting an engine of a vehicle.SOLUTION: An anti-theft device 1 is the anti-theft device 1 which is connected between a vehicle battery 2 and an on-vehicle instrument 3 that operates on power supplied from the battery 2, and comprises: a switching unit 11 that switches between a normal state where the battery 2 can supply the first power to the on-vehicle instrument 3, and a low-power protection state where the battery 2 supplies the second power smaller than the first power to the on-vehicle instrument 3; a communication unit 15 that receives operation data from an operation device; and a control unit 17 that sets the switching unit 11 to the normal state if the operation data indicates to set the normal state, and sets the switching unit 11 to the low-power protection state if the operation data received by the communication unit 15 does not indicate to set the normal state.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to an anti-theft device for preventing theft in a vehicle.

Background Art

[0002] A method of relaying the radio wave emitted by the smart key of a vehicle to unlock the electronic lock of this vehicle has been reported. In order to suppress vehicle theft by such a method, an invention has been proposed that enables switching to a protection state in which the supply of power to in-vehicle devices such as an electronic lock is stopped (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the method described in Patent Document 1, since the supply of power to in-vehicle devices is stopped in the protection state, even if the radio wave emitted by the smart key of the vehicle is relayed, the electronic lock of the vehicle is not unlocked. On the other hand, in the method described in Patent Document 1, there is a problem that in-vehicle devices are initialized because the supply of power to in-vehicle devices is stopped in the protection state.

[0005] Therefore, the present invention has been made in view of these points, and an object thereof is to provide an anti-theft device that can suppress the initialization of in-vehicle devices and suppress the movement of the vehicle by a thief.

Means for Solving the Problems

[0006] The anti-theft device of the present invention is an anti-theft device connected between a vehicle battery and in-vehicle devices that operate by the power supplied by the battery, the anti-theft device including a switching unit that switches between a normal state in which the battery can supply first power to the in-vehicle devices and a low-power protection state in which the battery supplies second power smaller than the first power to the in-vehicle devices, a communication unit that receives operation data from an operation device, and a control unit that sets the switching unit to the normal state when the operation data indicates setting to the normal state, and sets the switching unit to the low-power protection state when the operation data received by the communication unit does not indicate setting to the normal state.

[0007] The second power is, for example, power supplied at a voltage equal to or higher than a voltage capable of operating the in-vehicle devices not used for driving the vehicle and lower than a voltage capable of operating the in-vehicle devices used for driving the vehicle.

[0008] The anti-theft device further includes a measurement unit that measures the remaining amount of the battery, the switching unit switches between the normal state, the low-power protection state, and a supply stop state in which the battery does not supply power to the in-vehicle devices, and the control unit sets the switching unit to the low-power protection state when the operation data received by the communication unit does not indicate setting to the normal state and the remaining amount is equal to or greater than a threshold value, and the control unit may set the switching unit to the supply stop state when the operation data received by the communication unit does not indicate setting to the normal state and the remaining amount is less than the threshold value.

[0009] The control unit may switch between a normal state in which the first power input to the first terminal is output from the third terminal and a low-power protection state in which the second power input to the second terminal is output from the third terminal based on the operation data, where the switching unit has a first terminal connected to the battery, a second terminal connected to an auxiliary battery different from the battery, and a third terminal that outputs power to the in-vehicle devices.

[0010] The anti-theft device further includes a converter that converts the voltage supplied from the battery into a lower voltage. The switching unit has a first terminal connected to the battery, a second terminal connected to the converter, and a third terminal that outputs power to the in-vehicle device. The control unit may switch between the normal state in which the first power input to the first terminal is output from the third terminal and the low-power protection state in which the second power input to the second terminal is output from the third terminal based on the operation data.

[0011] The anti-theft device further includes a storage unit that stores the type of the vehicle in association with a set value corresponding to the second power. The control unit may acquire type data indicating the type of the vehicle and supply the second power corresponding to the set value stored in the storage unit in association with the acquired type data to the in-vehicle device in the low-power protection state.

[0012] The anti-theft device further includes a sensing unit that senses an impact applied to the vehicle. The switching unit switches between the normal state, the low-power protection state, and a supply stop state in which the battery does not supply power to the in-vehicle device. The control unit may set the switching unit to the supply stop state when the sensing unit senses the impact.

Advantages of the Invention

[0013] According to the present invention, there is an effect of suppressing the movement of the vehicle by a thief while suppressing the initialization of the in-vehicle device.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Mode for Carrying Out the Invention

[0015] [Outline of Theft Prevention System S] FIG. 1 is a diagram for explaining the outline of the theft prevention system S. The theft prevention system S includes a theft prevention device 1 and an operation device 100. The theft prevention device 1 is installed in a vehicle and used to suppress the intrusion of a thief into the vehicle or the theft of the vehicle. The vehicle may be, for example, any object that a person can ride on, and four-wheeled vehicles, two-wheeled vehicles, motorcycles, airplanes or ships are also included in the vehicle.

[0016] The operation device 100 is a device for the user U of the vehicle to operate the theft prevention device 1. The operation device 100 may be configured integrally with a key or an immobilizer for opening and closing the vehicle door, or may be a dedicated device for operating the theft prevention device 1. The operation device 100 may be a communication terminal such as a smartphone installed with an application program for operating the theft prevention device 1. The operation device 100 is provided with buttons for the user U to operate. The operation device 100 may be provided with a display for displaying information.

[0017] The anti-theft device 1 is used while being connected between the battery 2 of the vehicle and in-vehicle devices 3 that operate by the electric power supplied by the battery 2. The anti-theft device 1 restricts the electric power supplied from the battery 2 to the in-vehicle devices 3 to a state where the starter motor cannot start the engine, thereby suppressing theft of the vehicle by a thief. Although the anti-theft device 1 is assumed to be installed near the battery 2 of the vehicle, the location where the anti-theft device 1 is installed is arbitrary.

[0018] As shown in FIG. 1, the anti-theft device 1 is used while being inserted in the middle of the wiring for connecting the battery 2 and the in-vehicle devices 3. Specifically, the anti-theft device 1 is connected to the power supply terminal and the ground (GND) terminal of the battery 2, and is also connected to the power supply side wiring and the ground side wiring connected to the in-vehicle devices 3. The in-vehicle devices 3 are electronic devices that operate by the electric power supplied by the battery 2 in the vehicle, and for example, are an engine control unit (ECU), an electronic lock, a light, an air conditioner, or a car navigation device.

[0019] The anti-theft device 1 can receive data from the operation device 100 via a communication channel. The communication channel is, for example, Bluetooth (registered trademark), Wi-Fi (registered trademark), or a mobile phone communication line, but the communication method is arbitrary. The communication channel may be a wired communication channel. The anti-theft device 1 switches between a normal state in which the first electric power output from the battery 2 is supplied to the in-vehicle devices 3 based on the operation data transmitted by the operation device 100 when the user U of the vehicle operates the operation device 100, and a low-power protection state in which a second electric power smaller than the first electric power is supplied to the in-vehicle devices 3.

[0020] When the anti-theft device 1 is in the low-power protection state, the second electric power is supplied to the in-vehicle devices 3, but the electric power required to operate the in-vehicle devices 3 (for example, the starter motor) used to drive the vehicle is not supplied to the in-vehicle devices 3. For this reason, the anti-theft device 1 can suppress the in-vehicle devices 3 from being initialized and can suppress a thief from moving the vehicle.

[0021] [Configuration of Anti-theft Device 1] FIG. 2, FIG. 3, and FIG. 4 are diagrams schematically showing the internal configuration of the anti-theft device 1. The anti-theft device 1 includes a switching unit 11, a converter 12, a measurement unit 13, a sensing unit 14, a communication unit 15, a storage unit 16, and a control unit 17. FIG. 2 shows a state in which the battery 2 is electrically connected to the in-vehicle device 3 at the switching unit 11. FIG. 3 shows a state in which the converter 12 is electrically connected to the in-vehicle device 3 at the switching unit 11. FIG. 4 shows a state in which neither the battery 2 nor the converter 12 is electrically connected to the in-vehicle device 3 at the switching unit 11.

[0022] The anti-theft device 1 has a terminal T1, a terminal T2, a terminal T3, and a terminal T4. The terminals T1 and T2 are connected to the power terminals of the battery 2, and the terminal T4 is connected to the ground terminal of the battery 2. The terminal T3 is connected to the power-side wiring connected to the in-vehicle device 3, and the terminal T5 is connected to the ground-side wiring connected to the in-vehicle device 3.

[0023] Based on the control of the operation data received by the communication unit 15, the switching unit 11 switches between a normal state (the state in FIG. 2) in which the battery 2 can supply first power to the in-vehicle device 3, a low-power protection state (the state in FIG. 3) in which the battery 2 can supply second power to the in-vehicle device 3, and a supply stop state (the state in FIG. 4) in which power is not supplied from the battery 2 to the in-vehicle device 3. The second power is smaller than the first power. The second power is a voltage equal to or higher than the voltage capable of operating the in-vehicle device 3 (e.g., a car navigation system) that is not used to drive the vehicle and lower than the voltage capable of operating the in-vehicle device 3 (e.g., an electric motor) used to drive the vehicle. The voltage capable of operating the in-vehicle device 3 that is not used to drive the vehicle may be lower than the voltage for operating all functions of the in-vehicle device 3 as long as the in-vehicle device 3 is not initialized. The switching unit 11 may transition between two states, namely, the normal state and the low-power protection state.

[0024] The switching unit 11 is provided with a first terminal S1 connected to the battery 2 and a second terminal S2 connected to the converter. The switching unit 11 is provided with a third terminal S3 that outputs power to the in-vehicle device 3. The fourth terminal S4 of the switching unit 11 is open or grounded.

[0025] The converter 12 is, for example, a DC-DC converter. The converter 12 converts the voltage supplied from the battery 2 into a lower voltage. The converter 12 supplies the second power to the in-vehicle device 3 with the converted voltage.

[0026] The measurement unit 13 measures the remaining amount of the battery 2. For example, the measurement unit 13 is a voltage sensor that measures the voltage between the terminals of the battery 2 and converts the measured voltage between the terminals into the remaining amount of the battery 2. The measurement unit 13 inputs the measurement result of the remaining amount of the battery 2 to the control unit 17.

[0027] The sensing unit 14 senses the impact applied to the vehicle. For example, the sensing unit 14 is a sensor that senses the acceleration applied to the vehicle as the impact applied to the vehicle. The sensing unit 14 inputs the information indicating the sensed impact to the control unit 17.

[0028] The communication unit 15 receives operation data from the operation device 100. The communication unit 15 receives, for example, operation data instructing the switching unit 11 to shift to the normal state in which the first power output from the battery 2 is supplied to the in-vehicle device 3, or operation data not instructing the switching unit 11 to shift to this normal state. The communication unit 15 inputs the received operation data to the control unit 17.

[0029] The memory unit 16 is composed of, for example, a ROM (Read Only Memory) and a RAM (Random Access Memory), etc. The memory unit 16 stores various programs and various data for enabling the control unit 17 to function. For example, the memory unit 16 stores type data indicating the type of the vehicle. The memory unit 16 stores predetermined set value data. FIGS. 5(a) and 5(b) show examples of the set value data stored in the memory unit 16. FIG. 5(a) shows an example of the set value data when the set value is a voltage value. FIG. 5(b) shows an example of the set value data when the set value is a power value.

[0030] In the set value data shown in FIG. 5(a), the type of the vehicle and the set value corresponding to the second power are associated. The unit of the set value is volts. In the example of the first row from the top in FIG. 5(a), the vehicle type "Vehicle X" and the set value "V1" volts are associated. In the set value data shown in FIG. 5(b), the unit of the set value is watts. In the example of the second row from the top in FIG. 5(b), the type "Vehicle V" and the set value "W2" watts are associated. The set value data shown in FIGS. 5(a) and 5(b) is referred to when the control unit 17 determines the set value of the second power.

[0031] The control unit 17 is, for example, a CPU (Central Processing Unit). The control unit 17 executes various functions by executing the programs stored in the memory unit 16. The control unit 17 controls the switching unit 11 to switch between the normal state, the low power protection state, and the supply stop state based on the operation data received by the communication unit 15.

[0032] When the received operation data instructs to shift to the normal state, the control unit 17 causes the switching unit 11 to shift to the normal state. FIG. 2 shows the state of the switching unit 11 in the normal state. As shown in FIG. 2, the control unit 17 causes the first power input to the first terminal S1 of the switching unit 11 in the normal state to be output from the third terminal S3.

[0033] When the received operation data does not instruct a transition to the normal state, the control unit 17 causes the switching unit 11 to transition to the low-power protection state. FIG. 3 shows the state of the switching unit 11 in the low-power protection state. As shown in FIG. 3, the control unit 17 causes the second power input to the second terminal S2 of the switching unit 11 in the low-power protection state to be output from the third terminal S3. The control unit 17 supplies the second power to the in-vehicle device 3 in the low-power protection state. Therefore, in the low-power protection state, the in-vehicle device 3 is not initialized, and the in-vehicle device 3 used to drive the vehicle does not operate.

[0034] [Control of the switching unit 11 based on the remaining amount of the battery 2] The control unit 17 may switch between the normal state, the low-power protection state, and the supply stop state based on the measurement result of the remaining amount of the battery 2 by the measurement unit 13. More specifically, when the operation data received by the communication unit 15 does not indicate a transition to the normal state, the control unit 17 determines whether the remaining amount of the battery 2 is equal to or greater than a threshold value. When the remaining amount of the battery 2 is equal to or greater than the threshold value, the control unit 17 sets the switching unit 11 to the low-power protection state. The threshold value is, for example, a value obtained by adding a margin value to the power value required to start the engine by the starter motor. The margin value is, for example, a value determined based on the amount by which the remaining amount of the battery 2 decreases due to self-discharge.

[0035] On the other hand, when the remaining amount of the battery 2 is less than the threshold value, the control unit 17 causes the switching unit 11 to transition to a supply stop state in which the battery 2 does not supply power to the in-vehicle device 3. FIG. 4 shows the state of the switching unit 11 in the supply stop state. The control unit 17 connects the input-side fourth terminal S4 to the output-side third terminal S3 in the supply stop state. At this time, as shown by the broken line in FIG. 4, the control unit 17 does not supply any power from the battery 2 and the converter 12 to the in-vehicle device 3. By operating the control unit 17 in this way, the in-vehicle device 3 does not consume power when the remaining amount of the battery 2 is low, so that after the switching unit 11 returns to the normal state, it is possible to suppress the state in which the engine of the vehicle cannot be started due to insufficient remaining amount of the battery 2.

[0036] [Supply of Second Power Corresponding to Vehicle Type] The control unit 17 supplies the in-vehicle device 3 with second power corresponding to the vehicle type in the low-power protection state. First, the control unit 17 acquires type data indicating the vehicle type from the storage unit 16. The control unit 17 acquires set value data (Fig. 5(a)) that associates the vehicle type with a set value corresponding to the second power from the storage unit 16. The control unit 17 specifies the set value stored in the storage unit 16 in association with the type indicated by the acquired type data with reference to the acquired set value data. The control unit 17 supplies the in-vehicle device 3 with the second power corresponding to the specified set value.

[0037] In the example of the set value data shown in Fig. 5(a), when the control unit 17 acquires from the storage unit 16 type data indicating that the vehicle type is "Vehicle X" in the low-power protection state, the control unit 17 specifies the set value "V1" volts associated with the type "Vehicle X". The control unit 17 supplies the in-vehicle device 3 with the second power by applying a voltage of the set value "V1" volts to the in-vehicle device 3 through voltage conversion by the converter 12.

[0038] The control unit 17 may determine the vehicle type based on a signal input to a predetermined one or more input ports of the CPU. As an example, when the control unit 17 is wired such that a high-level signal is input to a predetermined input port of the CPU during the manufacture of the anti-theft device 1, the control unit 17 may determine that the vehicle type is Vehicle X. In this case, the control unit 17 specifies the set value "V1" volts associated with the specified type "Vehicle X" in the set value data (Fig. 5(a)). On the other hand, when the control unit 17 is wired such that a low-level signal is input to a predetermined input port during the manufacture of the anti-theft device 1, the control unit 17 may determine that the vehicle type is Vehicle Y. In this case, the control unit 17 specifies the set value "V2" volts associated with the specified type "Vehicle Y" in the set value data.

[0039] The set value is not limited to the example of being a voltage value and may be a power value. In the example of the set value data shown in FIG. 5(b), when the control unit 17 acquires the type data indicating that the type of the vehicle is "V vehicle" in the low power protection state from the storage unit 16, the control unit 17 specifies the set value "W2" watts associated with the type "V vehicle". At this time, the control unit 17 may determine the voltage after conversion by the converter 12 so that the second power of the specified "W2" watts is supplied to the in-vehicle device 3.

[0040] [Transition to the supply stop state when an impact is sensed] When the sensing unit 14 senses an impact, the control unit 17 may put the switching unit 11 in the supply stop state. As an example, when the sensing unit 14 senses an acceleration equal to or greater than a predetermined value in the normal state or the low power protection state, the control unit 17 puts the switching unit 11 in the supply stop state. On the other hand, when the sensing unit 14 senses an acceleration less than the predetermined value in the normal state or the low power protection state, the control unit 17 maintains the switching unit 11 in the normal state or the low power protection state and does not shift the switching unit 11 to the supply stop state.

[0041] In this way, when a thief tries to break the door or window glass of the vehicle and applies an impact to the vehicle, etc., the control unit 17 can suppress the electronic lock from being released by stopping the power supply to the in-vehicle device 3. In this way, since the control unit 17 suppresses the thief from entering the vehicle, the probability of the vehicle being stolen can be reduced.

[0042] [Modification example of supplying the second power from the auxiliary battery 21] The control unit 17 is not limited to the example of supplying the second power from the converter 12 to the in-vehicle device 3 in the low-power protection state. For example, the control unit 17 may supply the second power from the auxiliary battery 21 to the in-vehicle device 3 in the low-power protection state. FIG. 6 shows an example of the anti-theft device 200 of this modified example. The anti-theft device 200 does not include the converter 12. For circuit blocks similar to those of the anti-theft device 1 in FIG. 2, the same reference numerals as in FIG. 2 are used and the description is omitted. In the example of FIG. 6, the second terminal S2 of the switching unit 11 is connected to an auxiliary battery 21 different from the battery 2.

[0043] Based on the operation data, the control unit 17 switches between a normal state in which the first power input to the first terminal S1 is output from the third terminal S3 and a low-power protection state in which the second power input to the second terminal S2 is output from the third terminal S3. Since the operation of the control unit 17 is the same as in the example of FIG. 6, the description is omitted.

[0044] [Example of the processing flow in the anti-theft device 1] FIG. 7 is a flowchart showing an example of the processing procedure flow in the anti-theft device 1 shown in FIG. 2. The processing procedure in FIG. 7 starts, for example, during the operation of the anti-theft device 1. First, the control unit 17 determines whether or not it has received operation data via the communication unit 15 (S101). When the control unit 17 determines that the communication unit 15 has received the operation data (YES in S101), it determines whether or not the received operation data instructs a transition to the normal state (S102).

[0045] When the control unit 17 determines that the received operation data does not instruct a transition to the normal state (NO in S102), it determines whether or not the vehicle engine is off (S103). When the control unit 17 determines that the vehicle engine is off (YES in S103), it causes the switching unit 11 to transition to the low-power protection state and switches the switching unit 11 so as to output the second power input from the converter 12 to the in-vehicle device 3 (S104).

[0046] The control unit 17 determines whether the impact sensor 14 has detected an impact applied to the vehicle (S105). When the impact sensor 14 has not detected an impact applied to the vehicle (NO in S105), the control unit 17 determines whether the remaining battery level 2 measured by the measurement unit 13 is less than the threshold value (S106). When the control unit 17 determines that the remaining battery level is less than the threshold value (YES in S106), the control unit 17 shifts the switching unit 11 to a supply stop state in which neither the power supplied from the battery 2 nor the converter 12 is supplied to the in-vehicle device 3 (S107), and ends the process.

[0047] When the control unit 17 determines that no operation data has been received in the determination of S101 (NO in S101), the control unit 17 repeats the determination of S101. When the control unit 17 determines that the operation data received in the determination of S102 instructs a transition to the normal state (YES in S102), the control unit 17 shifts the switching unit 11 to the normal state and switches the switching unit 11 so as to output the first power input from the battery 2 to the in-vehicle device 3 (S108). When the control unit 17 determines that the vehicle engine is on in the determination of S103 (NO in S103), the control unit 17 proceeds to the process of S108. When the control unit 17 determines that the impact sensor 14 has detected an impact applied to the vehicle in the determination of S105 (YES in S105), the control unit 17 proceeds to the process of S107. When the control unit 17 determines that the remaining battery level is equal to or greater than the threshold value in the determination of S106 (NO in S106), the control unit 17 returns to the process of S101.

[0048] <Effect of the anti-theft system S of the present embodiment> According to the anti-theft system S of the present embodiment, when the switching unit 11 is in the low-power protection state, the control unit 17 supplies the second power to the in-vehicle device 3, but does not supply the power required to operate the in-vehicle device 3 used to drive the vehicle to the in-vehicle device 3. Therefore, the control unit 17 can suppress the in-vehicle device 3 from being initialized and can suppress the thief from moving the vehicle.

[0049] As described above, the present invention has been described using embodiments. However, the technical scope of the present invention is not limited to the scope described in the above embodiments, and various modifications and changes are possible within the scope of the gist. For example, all or part of the device can be configured by functionally or physically dispersing and integrating it in any unit. Also, new embodiments resulting from any combination of a plurality of embodiments are included in the embodiments of the present invention. The effects of the new embodiments resulting from the combination have the effects of the original embodiments combined.

Explanation of Signs

[0050] 1 Anti-theft device 2 Battery 3 Vehicle-mounted device 11 Switching unit 12 Converter 13 Measuring unit 14 Sensing unit 15 Communication unit 16 Storage unit 17 Control unit 21 Auxiliary battery 100 Operating device 200 Anti-theft device

Claims

1. An anti-theft device connected between a vehicle battery and in-vehicle devices operated by electric power supplied from the battery, comprising: a switching unit that switches between a normal state in which the battery can supply first power to the in-vehicle devices and a low-power protection state in which the battery supplies second power smaller than the first power to the in-vehicle devices; a communication unit that receives operation data from an operation device; a control unit that sets the switching unit to the normal state when the operation data indicates that the normal state is to be set, and sets the switching unit to the low-power protection state when the operation data received by the communication unit does not indicate that the normal state is to be set; An anti-theft device having the above components.

2. The second power is a power supplied at a voltage equal to or higher than a voltage capable of operating the in-vehicle devices not used for driving the vehicle and lower than a voltage capable of operating the in-vehicle devices used for driving the vehicle. The anti-theft device according to claim 1.

3. The anti-theft device further includes a measurement unit that measures the remaining amount of the battery. The switching unit switches between the normal state, the low-power protection state, and a supply stop state in which the battery does not supply power to the in-vehicle devices. When the operation data received by the communication unit does not indicate that the normal state is to be set and the remaining amount is equal to or greater than a threshold value, the control unit sets the switching unit to the low-power protection state. When the operation data received by the communication unit does not indicate that the normal state is to be set and the remaining amount is less than the threshold value, the control unit sets the switching unit to the supply stop state. The anti-theft device according to claim 1.

4. The control unit includes a first terminal connected to the battery, a second terminal connected to an auxiliary battery different from the battery, and a third terminal that outputs power to the in-vehicle devices. Based on the operation data, the control unit switches between the normal state in which the first power input to the first terminal is output from the third terminal and the low-power protection state in which the second power input to the second terminal is output from the third terminal. The anti-theft device according to any one of claims 1 to 3.

5. The anti-theft device further includes a converter that converts the voltage supplied from the battery into a lower voltage. The switching unit has a first terminal connected to the battery, a second terminal connected to the converter, and a third terminal that outputs power to the in-vehicle device. Based on the operation data, the control unit switches between the normal state in which the first power input to the first terminal is output from the third terminal, and the low-power protection state in which the second power input to the second terminal is output from the third terminal. The anti-theft device according to any one of claims 1 to 3.

6. The device further includes a storage unit that stores the type of the vehicle in association with a set value corresponding to the second power. The control unit acquires type data indicating the type of the vehicle, and supplies the second power corresponding to the set value stored in the storage unit in association with the acquired type data to the in-vehicle device in the low-power protection state. The anti-theft device according to claim 1.

7. The device further includes a sensing unit that senses an impact applied to the vehicle. The switching unit switches between the normal state, the low-power protection state, and a supply stop state in which the battery does not supply power to the in-vehicle device. When the sensing unit senses the impact, the control unit sets the switching unit to the supply stop state. The anti-theft device according to claim 1.

Images