On-board device and power supply type determination method

Abstract

To automatically determine a power supply type and appropriately set a determination result even when a power supply connection is changed while ACC is off.SOLUTION: An on-board device according to an embodiment comprises a supply terminal of a constant power supply from a vehicle battery, a non-volatile storage unit, and a controller. The controller is activated by a change in voltage to the supply terminal while in a sleep state due to ACC being off. The controller measures the voltage at the supply terminal. When the voltage is equal to or greater than a threshold, the controller determines that the power supply connection is a first connection in which the supply terminal is connected to the constant power supply. When the voltage is less than the threshold, the controller determines that the power supply connection is a second connection different from the first connection. After storing the determination result of the power supply connection in the storage unit, the controller transitions into the sleep state.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The disclosed embodiments relate to an in-vehicle device and a method for determining a power source type. [Background technology]

[0002] Conventionally, there are known in-vehicle devices that can selectively use two types of power connections: a harness connection from a vehicle battery (hereinafter referred to as a "vehicle battery connection") or a plug connection to a cigarette lighter socket (hereinafter referred to as a "cigarette lighter power connection"). An example of such an in-vehicle device is a drive recorder.

[0003] Such an in-vehicle device operates in a mode depending on the selected power source connection. For example, when connected to the vehicle battery, the in-vehicle device operates in the vehicle battery mode. When connected to the cigarette lighter power source, the in-vehicle device operates in the cigarette lighter power mode.

[0004] For example, in the case of a drive recorder, in vehicle battery mode, even when the accessory power supply is off (hereinafter referred to as "ACC off"), the drive recorder can perform recording operation by receiving power from the vehicle battery. On the other hand, in cigarette lighter power mode, when the ACC is off, the drive recorder cannot receive power from the cigarette lighter power supply (i.e., the vehicle battery), so the drive recorder performs recording operation using its own built-in battery.

[0005] Whether the vehicle battery connection or the cigarette lighter power connection is selected is set by a user operation via an HMI (Human Machine Interface), such as a user setting screen, and written to non-volatile memory.

[0006] Therefore, if there is a discrepancy between the physical wiring of the power connection and the setting made by the user, the in-vehicle device will experience inconsistencies in operation in each of the above modes. For example, if a drive recorder that is physically connected to the vehicle battery is set to a cigarette lighter power connection by user operation, the drive recorder will perform limited recording operations using the built-in battery, even though it can receive power from the vehicle battery.

[0007] In relation to these problems, a technique has been proposed in which the type of power source used by an electronic device in operation is automatically determined and power control is performed according to the determined type (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-025381 Summary of the Invention [Problem to be solved by the invention]

[0009] However, the above-mentioned conventional technology cannot automatically determine the power source type of an in-vehicle device that is in a sleep state while the ACC is off, such as a drive recorder. Also, the physical wiring of the power source connection of an in-vehicle device may be changed while the ACC is off, and the above-mentioned conventional technology cannot automatically determine the power source type in such cases and set the determined result appropriately.

[0010] One aspect of the embodiment has been made in consideration of the above, and aims to provide an in-vehicle device and a power source type determination method that can automatically determine the power source type and set the determination result appropriately even when the power source connection is changed while the ACC is off. [Means for solving the problem]

[0011] According to one aspect of the embodiment, an in-vehicle device includes a non-volatile storage unit, a supply terminal for a constant power source from a vehicle battery, and a controller. The controller is activated by a change in voltage at the supply terminal when the device is in a sleep state due to ACC being off. The controller measures the voltage at the supply terminal. If the voltage is equal to or greater than a threshold, the controller determines that the power connection is a first connection to the constant power source. If the voltage is less than the threshold, the controller determines that the power connection is a second connection different from the first connection. The controller stores the result of the power connection determination in the storage unit and then transitions to the sleep state. [Effects of the Invention]

[0012] According to one aspect of the embodiment, the controller, which is activated by a voltage change at the supply terminal, measures the voltage and determines whether the first connection, which corresponds to a constant power supply, or the second connection, which is different from the first connection, based on the measured voltage, thereby automatically determining the power source type. Furthermore, the controller stores the determination result in a nonvolatile memory unit and returns to its original sleep state, so that the determination result can be read the next time the controller is started. Therefore, according to one aspect of the embodiment, even if the power source connection is changed while the ACC is off, the power source type can be automatically determined and the determination result can be set appropriately. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a diagram illustrating an example of the configuration of an in-vehicle device according to an embodiment. [Figure 2] FIG. 2 is an explanatory diagram of the power supply connection portion. [Figure 3] FIG. 3 is a diagram illustrating an outline of a power source type determination method according to an embodiment. [Figure 4] FIG. 4 is an explanatory diagram showing an example of operation when a change is made from connection to the cigarette lighter power source to connection to the vehicle battery while the ACC is off. [Figure 5]FIG. 5 is an explanatory diagram showing an example of operation when a change is made from connection to the vehicle battery to connection to the cigarette lighter power source while the ACC is off. [Figure 6] FIG. 6 is a flowchart showing a procedure for presetting the in-vehicle device. [Figure 7] FIG. 7 is a flowchart (part 1) showing the processing procedure executed by the in-vehicle device. [Figure 8] FIG. 8 is a flowchart (part 2) illustrating the processing procedure executed by the in-vehicle device. [Figure 9] FIG. 9 is a diagram showing an example of the configuration of a power supply type determination system including an in-vehicle device. [Figure 10] FIG. 10 is a flowchart (part 3) illustrating the processing procedure executed by the in-vehicle device. DETAILED DESCRIPTION OF THE INVENTION

[0014] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] The following detailed description of the preferred embodiments of the in-vehicle device and the method for determining the type of power source disclosed herein will be given with reference to the accompanying drawings. Note that the present invention is not limited to the following embodiments.

[0015] In the following description, it is assumed that the power supply type determination method according to the embodiment is executed by the microcomputer 12 (see FIG. 1) of the in-vehicle device 10 according to the embodiment.

[0016] (Example of in-vehicle device configuration) FIG. 1 is a diagram showing an example of the configuration of an in-vehicle device 10 according to an embodiment. FIG. 2 is an explanatory diagram of a power supply connection unit 3. The in-vehicle device 10 is an electronic device mounted on a vehicle. The in-vehicle device 10 is, for example, a drive recorder or an ECU (Electronic Control Unit). In this embodiment, the in-vehicle device 10 is assumed to be a drive recorder.

[0017] As shown in FIG. 1, the in-vehicle device 10 includes a storage unit 11, a microcomputer 12, an HMI unit 13, and an internal battery 14. The storage unit 11 is a writable non-volatile memory. The storage unit 11 is realized by, for example, an EEPROM (Electrically Erasable Programmable Read-Only Memory) or a flash memory. The storage unit 11 stores a program according to the embodiment that is executed by the microcomputer 12. The storage unit 11 also stores the type of power source determined by the microcomputer 12.

[0018] The microcomputer 12 is a microcomputer having a CPU (Central Processing Unit), RAM (Random Access Memory), etc. The microcomputer 12 corresponds to an example of a "controller." The microcomputer 12 may be configured in part or in whole by hardware such as an ASIC (Application Specific Integrated Circuit) or FPGA (Field Programmable Gate Array).

[0019] The microcomputer 12 realizes a function corresponding to the power supply type determination method according to the embodiment by the CPU executing a program stored in the storage unit 11 using the RAM as a work area. The microcomputer 12 also transitions to a sleep state while the ACC is off.

[0020] The HMI unit 13 is a component that provides an interface for input and output to the user of the in-vehicle device 10. The HMI unit 13 includes an input interface that accepts input operations from the user. The HMI unit 13 also includes an output interface that presents visual information and audio information to the user. For example, the HMI unit 13 includes a touch panel display, a microphone, a speaker, and the like. The HMI unit 13 may also be realized by a terminal device such as a smartphone that is remotely connected to the in-vehicle device 10.

[0021] The internal battery 14 is a battery that is built into the in-vehicle device 10 and is used as a sub-power source in place of the vehicle battery. For example, if the in-vehicle device 10 is a drive recorder and is physically connected to a cigarette lighter power source, the in-vehicle device 10 operates in cigarette lighter power mode with power supplied from the internal battery 14 while the ACC is off.

[0022] The in-vehicle device 10 is connected to each power source via a power source connector 3. The power source connector 3 has a connector for connecting to a vehicle battery and a connector for connecting to a cigarette lighter power source. The connector for connecting to the vehicle battery has a connector for +B and a connector for ACC.

[0023] +B is a constant power source from the + terminal of the vehicle battery. A voltage of 12V is always supplied to +B. Here, the voltage of 12V may be interpreted as "normal voltage." The normal voltage may not be strictly 12V, but may be a voltage close to 12V. The in-vehicle device 10 is connected to +B via a harness. As shown in FIG. 1, the microcomputer 12 has point A, which is the supply terminal for +B from the vehicle battery.

[0024] The ACC is a power supply that supplies a voltage of 12V only when the key is in the ACC or IG position (that is, when the ACC is on). The in-vehicle device 10 is also connected to the ACC via a harness.

[0025] The cigarette lighter power supply is a socket-type power supply into which a plug extending from the in-vehicle device 10 or other electronic devices or electrical appliances is inserted. When the ACC is on, the cigarette lighter power supply basically supplies a direct current (DC) of 12V.

[0026] As shown in Fig. 2, the vehicle battery connection, which is a physical connection to the vehicle battery (corresponding to an example of a "first connection"), and the cigarette lighter power supply connection, which is a physical connection to a cigarette lighter power supply (corresponding to an example of a "non-first connection" or "second connection"), are alternatives. In other words, the two connections are made exclusively.

[0027] (Description of power source type determination method according to embodiment) In such an in-vehicle device 10, the method for determining the type of power source according to the embodiment is executed by the microcomputer 12. The microcomputer 12 is woken up by a change in the voltage at point A when the device is in a sleep state due to ACC being off. The microcomputer 12 also measures the voltage at point A. If the measured voltage is equal to or greater than a threshold, the microcomputer 12 determines that the power source is connected to a vehicle battery that is always connected to a power source. If the measured voltage is less than the threshold, the microcomputer 12 determines that the power source is connected to a cigarette lighter power source. The controller then stores the result of the power source connection determination in the memory unit 11, and then transitions to a sleep state.

[0028] 3 is a diagram illustrating an outline of a power supply type determination method according to an embodiment. In the power supply type determination method according to an embodiment, first, the wake-up function of the microcomputer 12 is set as a pre-setting.

[0029] 3, during the manufacturing stage of the in-vehicle device 10, the wake-up function of the microcomputer 12 is preset so as to wake up when the +B voltage at point A changes while the device is in sleep mode with the ACC turned off (step S1). That is, the wake-up function of the microcomputer 12 is set so as to wake up the microcomputer 12 from the sleep state when an external interrupt occurs, such as a change in the +B voltage.

[0030] As a result, if the power supply connection is changed at the power supply connection unit 3 while the ACC is off, the microcomputer 12 will be activated if the +B voltage changes when the harness is inserted or removed (step S2).

[0031] Next, after startup, the microcomputer 12 measures the voltage at point A (step S3). If the measured voltage at point A is equal to or greater than a threshold (for example, 12 V, which corresponds to the +B voltage), the microcomputer 12 determines that the vehicle battery is connected. If the voltage at point A is less than the threshold (for example, 0 V), the microcomputer 12 determines that the cigarette lighter power supply is connected (step S4). Note that 0 V does not have to be strictly 0 V, and may be close to 0 V.

[0032] The microcomputer 12 then stores the determination result in the storage unit 11 and transitions to a sleep state (step S5). After that, the microcomputer 12 reads the determination result from the storage unit 11 at each startup (step S6) and operates the in-vehicle device 10 in a mode corresponding to the read determination result. This allows the microcomputer 12 to automatically determine whether the vehicle battery is connected, set the determination result appropriately, and then operate the in-vehicle device 10 without inconsistency in the mode corresponding to the determination result at the next startup and thereafter.

[0033] (Example of behavior when changing from cigarette lighter power connection to vehicle battery connection while ACC is off) Next, a more specific example of operation when using the power source type determination method according to the embodiment will be described. First, an example of operation when a change is made from a cigarette lighter power connection to a vehicle battery connection while the ACC is off will be described. Figure 4 is an explanatory diagram showing an example of operation when a change is made from a cigarette lighter power connection to a vehicle battery connection while the ACC is off.

[0034] In this case, as shown in FIG. 4, the in-vehicle device 10 detects a change from 0 V to 12 V at point A that accompanies a change from connection to the cigarette lighter power source to connection to the vehicle battery while the ACC is off (step S11).

[0035] The microcomputer 12, which is activated by this detection, measures the voltage of 12V at point A (step S12). The microcomputer 12 then determines that the vehicle battery is connected based on this voltage of 12V (step S13), stores the determination result "vehicle battery connected" in the memory unit 11 (step S14), and transitions to a sleep state. This allows the microcomputer 12 to automatically determine that the vehicle battery is connected and set the determination result appropriately.

[0036] Thereafter, at each startup, the microcomputer 12 reads the determination result "vehicle battery connected" from the memory unit 11 (step S15), and operates the in-vehicle device 10 in the vehicle battery mode corresponding to the read "vehicle battery connected".

[0037] (Example of behavior when changing from vehicle battery connection to cigarette lighter power connection while ACC is off) Next, an example of operation when a change is made from the vehicle battery connection to the cigarette lighter power supply while the ACC is off will be described. Fig. 5 is an explanatory diagram showing an example of operation when a change is made from the vehicle battery connection to the cigarette lighter power supply while the ACC is off.

[0038] In this case, as shown in FIG. 5, the in-vehicle device 10 detects a change from 12 V to 0 V at point A that accompanies a change from connection to the cigarette lighter power source to connection to the vehicle battery while the ACC is off (step S21).

[0039] The microcomputer 12, which is activated by this detection, measures the voltage of 0V at point A (step S22). The microcomputer 12 then determines that the cigarette lighter power supply is connected based on this voltage of 0V (step S23), stores the determination result "cigarette lighter power supply connected" in the memory unit 11 (step S24), and transitions to a sleep state. This allows the microcomputer 12 to automatically determine that the cigarette lighter power supply is connected and set the determination result appropriately.

[0040] Thereafter, at each startup, the microcomputer 12 reads the determination result "cigarette lighter power connected" from the memory unit 11 (step S25), and operates the in-vehicle device 10 in the cigarette lighter power mode corresponding to the read determination result "cigarette lighter power connected."

[0041] (Processing procedure when ACC is off) Next, the processing procedure executed by the in-vehicle device 10 while the ACC is off will be described with reference to Figs. 6 to 8. Fig. 6 is a flowchart showing a pre-setting procedure for the in-vehicle device 10. Fig. 7 is a flowchart (part 1) showing the processing procedure executed by the in-vehicle device 10. Fig. 8 is a flowchart (part 2) showing the processing procedure executed by the in-vehicle device 10.

[0042] 6, in the in-vehicle device 10, during the manufacturing stage of the in-vehicle device 10, the wake-up function is set in advance for the microcomputer 12 so that the in-vehicle device 10 is activated when the +B voltage at point A changes while the in-vehicle device 10 is in sleep mode with the ACC off (step S101). This completes the pre-setting procedure performed on the in-vehicle device 10.

[0043] After the setting procedure, the microcomputer 12 is activated by a voltage change at point A while the ACC is off (step S201), as shown in Fig. 7. The activated microcomputer 12 measures the voltage at point A (step S202). Then, the microcomputer 12 determines whether the measured voltage at point A is equal to or greater than a threshold value (step S203).

[0044] If the voltage at point A is equal to or greater than the threshold (step S203, Yes), the microcomputer 12 determines that the power source for the device is connected to the vehicle battery (step S204). On the other hand, if the voltage at point A is less than the threshold (step S203, No), the microcomputer 12 determines that the power source for the device is connected to the cigarette lighter power source (step S205).

[0045] Then, the microcomputer 12 stores the determination result in the storage unit 11 (step S206). Then, the microcomputer 12 transitions to a sleep state (step S207) and ends the process.

[0046] The in-vehicle device 10 may be started and operated when it detects an operational event, such as a recording event or a theft tracking event, while the ACC is off. During this operation, the in-vehicle device 10 may measure the voltage at point A at predetermined intervals and determine whether the power connection indicated by the measured value is inconsistent with (i.e., whether it matches) the determination result stored in the storage unit 11. If there is a contradiction, the in-vehicle device 10 may store the determination result based on the most recent measured value of the voltage at point A. Alternatively, in this case, the in-vehicle device 10 may notify an error using the HMI unit 13 or record a log.

[0047] The processing procedure in this case is shown in Fig. 8. In this case, first, the microcomputer 12 is started up upon detecting an operation event while the ACC is off (step S301). Then, the microcomputer 12 reads out the determination result stored in the storage unit 11 (step S302).

[0048] Then, the microcomputer 12 executes the operation control in the mode according to the power supply connection indicated by the read determination result (step S303). During the execution, the microcomputer 12 determines whether the monitoring period for point A has arrived (step S304).

[0049] If the monitoring period has arrived (step S304, Yes), the microcomputer 12 measures the voltage at point A (step S305). If the monitoring period has not arrived (step S304, No), the microcomputer 12 repeats the process from step S303.

[0050] Meanwhile, microcomputer 12, having measured the voltage at point A, determines whether the measured value contradicts the determination result of memory unit 11 saved in step S206 (step S306). If the measured voltage is 0V even though the determination result of memory unit 11 indicates that the vehicle battery is connected, microcomputer 12 determines in step S306 that there is a contradiction. Alternatively, if the measured voltage is 12V even though the determination result of memory unit 11 indicates that the cigarette lighter power supply is connected, microcomputer 12 determines in step S306 that there is a contradiction.

[0051] If it is determined in step S306 that there is a contradiction (step S306, Yes), the microcomputer 12 stores the determination result based on the latest voltage (the voltage measured in step S305) in the storage unit 11 (step S307). At this time, the microcomputer 12 may notify an error using the HMI unit 13, record a log, or the like. If it is determined in step S306 that there is no contradiction (step S306, No), the microcomputer 12 proceeds to step S308.

[0052] Then, the microcomputer 12 determines whether the system has been shut down (step S308). The microcomputer 12 determines that the system has been shut down when, for example, the capacity of the built-in battery has been depleted. If the system has been shut down (step S308, Yes), the microcomputer 12 transitions to a sleep state (step S309) and ends the process. On the other hand, if the microcomputer 12 determines that the system has not been shut down (step S308, No), the microcomputer 12 repeats the process from step S303.

[0053] As a result, even when the in-vehicle device 10 starts up and operates upon detecting an operation event while the ACC is off, the power source type can be automatically determined and the determination result can be set appropriately. Furthermore, even if the determination result in the storage unit 11 is initially correct, if the information in the storage unit 11 is erroneously rewritten due to a system error, external disturbance, or the like while the in-vehicle device 10 is operating, the determination result can be reset appropriately.

[0054] (Example of power source type determination system configuration) Next, a configuration example of the power source type determination system 1 including the on-vehicle device 10 will be described with reference to Fig. 9. Fig. 9 is a diagram showing a configuration example of the power source type determination system 1 including the on-vehicle device 10.

[0055] As shown in FIG. 9, the power source type determination system 1 includes a plurality of in-vehicle devices 10-1, 10-2, . . . , 10-m (m is a natural number of 2 or more) and a server device 100.

[0056] The server device 100 is a device that aggregates and manages information of multiple in-vehicle devices 10 when the in-vehicle devices 10 are owned by a business such as a taxi company, an insurance company, or a transportation company. The server device 100 is realized by, for example, a cloud server.

[0057] The server device 100 and the multiple in-vehicle devices 10 are connected to each other so as to be able to communicate with each other via a network N such as the Internet, a mobile phone network, or a C-V2X (Cellular Vehicle to Everything) communication network.

[0058] In such a power supply type determination system 1, the in-vehicle device 10 transmits the determination result to the server device 100 via the network N when the determination result of the power supply connection in the storage unit 11 (see FIG. 1) is updated.

[0059] The server device 100, which receives update information on the determination results from each of the vehicle-mounted devices 10, can centrally manage at least information on the power supply connection of each of the vehicle-mounted devices 10 based on this update information.

[0060] Furthermore, when the power connection determination result in the storage unit 11 is updated, each in-vehicle device 10 notifies the user of the updated information using the HMI unit 13 (see FIG. 1 ), as well as the server device 100. This allows the user of each in-vehicle device 10 to know, for example, that the power connection change he or she made has been properly reflected in the device, or the user can know that a power connection has been made that he or she does not remember, and can take action to deal with the situation.

[0061] (Processing procedure when starting with ACC on) Next, the processing procedure executed by the in-vehicle device 10 activated by turning on the ACC will be described with reference to Fig. 10. Fig. 10 is a flowchart (part 3) showing the processing procedure executed by the in-vehicle device 10.

[0062] 10, the microcomputer 12, which is started by turning on the ACC, reads out the determination result stored in the storage unit 11 (step S401). Then, the microcomputer 12 determines whether the determination result has been updated (step S402). This determination can be made, for example, by the microcomputer 12 setting an update flag associated with the determination result in step S206.

[0063] If there is an update (step S402, Yes), the microcomputer 12 notifies the HMI unit 13 of the update information (step S403). The microcomputer 12 also transmits the update information to the server device 100 via the network N (step S404). After executing steps S403 and S404, the microcomputer 12, for example, clears the update flag described above. If there is no update (step S402, No), the microcomputer 12 proceeds to step S405.

[0064] Then, the microcomputer 12 executes operation control in a mode according to the power supply connection indicated by the determination result (step S405).

[0065] Then, the microcomputer 12 determines whether the system has been shut down (step S406). For example, if the ACC is turned off, the microcomputer 12 determines that the system has been shut down. If the system has been shut down (step S406, Yes), the microcomputer 12 transitions to a sleep state (step S407) and ends the process. On the other hand, if the microcomputer 12 determines that the system has not been shut down (step S406, No), the microcomputer 12 repeats the process from step S405.

[0066] (Conclusion) As described above, the in-vehicle device 10 according to the embodiment includes point A, which is a supply terminal for a +B power supply (corresponding to an example of a "constant power supply") from the vehicle battery, a non-volatile storage unit 11, and a microcomputer 12 (corresponding to an example of a "controller"). The microcomputer 12 is activated by a change in voltage at point A when the microcomputer 12 is in a sleep state due to ACC being off. The microcomputer 12 also measures the voltage at point A. If the measured voltage at point A is equal to or greater than a threshold, the microcomputer 12 determines that the power connection is a first connection to the +B power supply. If the measured voltage is less than the threshold, the microcomputer 12 determines that the power connection is a second connection different from the first connection. The microcomputer 12 stores the result of the power connection determination in the storage unit 11 and then transitions to the sleep state.

[0067] Therefore, in the in-vehicle device 10 according to the embodiment, even when the microcomputer 12 is in a sleep state with the ACC off, the microcomputer 12 detects a change in voltage at point A, which is the supply terminal of the +B power supply, and wakes up. This voltage change is input as a so-called external interrupt, for example, when the power supply connection is changed while the ACC is off. The microcomputer 12 also measures the voltage at point A, and if the measured voltage is a value equivalent to the voltage of the +B power supply (e.g., 12 V), it determines that the connection is to a vehicle battery connected to the +B power supply (equivalent to an example of a "first connection"). If the measured voltage is a value not equivalent to the voltage of the +B power supply (e.g., 0 V), it determines that the connection is not to a vehicle battery, but to a cigarette lighter power supply (equivalent to an example of a "second connection"). The microcomputer 12 then stores the determination result in the non-volatile storage unit 11 so that it can be read the next time the microcomputer 12 is started, and returns to the original sleep state. Therefore, in the in-vehicle device 10 according to the embodiment, even when the power supply connection is changed while the ACC is off, it is possible to automatically determine the power supply type and appropriately set the determination result.

[0068] In the above-described embodiment, a cigarette lighter power connection is used as an example of the second connection, but the cigarette lighter power connection may refer to a power connection in which a plug is inserted into any in-vehicle accessory socket, including a cigarette lighter socket. This makes the present embodiment applicable even when an accessory socket other than a cigarette lighter socket is used.

[0069] Further advantages and modifications will readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents. [Explanation of symbols]

[0070] 1. Power source type identification system 3 Power connection 10 Onboard equipment 11 Storage section 12 Microcomputer 13 HMI section 14 Built-in battery 100 Server device N Network

Claims

1. A terminal for supplying constant power from a vehicle battery; a non-volatile storage unit; When the device is in a sleep state due to ACC off, it is woken up by a change in voltage to the supply terminal. measuring the voltage at the supply terminals; If the voltage is equal to or greater than a threshold value, the power supply connection is determined to be a first connection connected to the constant power supply; If the voltage is less than the threshold value, the power supply connection is determined to be a second connection different from the first connection; a controller that stores the power supply connection determination result in the storage unit and then transitions to the sleep state; An in-vehicle device comprising:

2. The controller If the voltage is a normal voltage of the continuous power supply, the power supply connection is determined to be the first connection. The in-vehicle device according to claim 1 .

3. The controller If the voltage is 0 V, it is determined that the power supply connection is the second connection. The in-vehicle device according to claim 2 .

4. The controller When the device is next started, the determination result is read from the storage unit, and the device operates in a mode corresponding to the determination result. The in-vehicle device according to claim 1 .

5. The controller periodically measuring the voltage during operation based on detection of an operation event with the ACC off; determining whether the power supply connection indicated by the measured voltage matches the determination result stored in the storage unit; If they do not match, the determination result based on the latest measured voltage value is stored in the storage unit. The in-vehicle device according to claim 1 .

6. The controller If the determination result is updated, the updated information is notified to the user at the next startup. The in-vehicle device according to claim 1 .

7. The power supply connection status management server is provided to be able to communicate with the power supply connection status management server. The controller If the determination result is updated, the update information is transmitted to the server device at the next startup. The in-vehicle device according to claim 6.

8. The controller and activating by a wake-up function configured to activate upon detecting a change in the voltage to the supply terminal. The in-vehicle device according to claim 1 .

9. the second connection being the power connection connected to an accessory socket including a cigarette lighter socket; The in-vehicle device according to any one of claims 1 to 8.

10. A power source type determination method executed by an in-vehicle device including a terminal for supplying constant power from a vehicle battery and a non-volatile storage unit, comprising: waking up the device in a sleep state due to a change in voltage to the supply terminal when the device is in a sleep state due to ACC being off; measuring the voltage at the supply terminals; If the voltage is equal to or greater than a threshold, determining that the power connection is a first connection to the continuous power supply; If the voltage is less than the threshold, determining that the power connection is a second connection different from the first connection; storing the power supply connection determination result in the storage unit, and then transitioning to the sleep state; A method for determining the type of power source, including:

Images