Power source state detection device and method

Abstract

To detect a power source state through a power source waveform of an ACC power source using a detection pattern according to a vehicle.SOLUTION: A power source state management section 12 comprises: a power source waveform acquisition section 21 which acquires a power source waveform when an ACC power source of a vehicle is switched on or off; a dedicated detection pattern generation section 22 which generates a dedicated detection pattern when the ACC power source is switched on or off based on the power source waveform; and a power source state detection section 24 which detects a power source state when the ACC power source is switched on or off based on the dedicated detection pattern.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an apparatus and method for detecting a power supply state, and more particularly to a technology for detecting an accessory power supply state in a vehicle. [Background technology]

[0002] There is a technique for detecting the fluctuation waveform of the battery power supply voltage when the vehicle engine is started, and acquiring and displaying battery power supply information (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-240776 A Summary of the Invention [Problem to be solved by the invention]

[0004] The power waveform when the accessory power supply (hereinafter referred to as ACC power supply) of a vehicle is turned on and off fluctuates due to the influence of power supply noise when the vehicle engine is turned on and off, the starting motor, etc. This fluctuation in the power supply waveform may be specific to the vehicle model.

[0005] Therefore, in an in-vehicle device that starts up on an ACC power source, even if you try to detect the ACC power source being on or off in a uniform pattern, such as by sampling the power source output voltage at intervals of 400 ms, startup or shutdown using the ACC power source may not be performed properly.

[0006] Figure 8 is a schematic diagram showing the voltage waveform over time as a voltage fluctuation pattern when the ACC power supply is turned on / off. In the case of the pattern in Figure 8A, if the voltage becomes "1" (above the threshold) 400 ms after the switch-on voltage is "0" and this is determined as start-up, the ACC power supply "on" is correctly detected. Also, in the case of the voltage waveform in Figure 8B when the ACC power supply is turned off, off is correctly detected. However, in the voltage waveform pattern in Figure 8C, the voltage has not risen at the measurement point 400 ms later, so it is determined that the ACC power supply is not on.

[0007] As such, since the power supply waveform when the ACC power supply is on or off differs depending on the vehicle, if the voltage is detected multiple times in order to ensure that the power supply state is detected, the detection time may be longer, which may delay the start of operation of the in-vehicle device.

[0008] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide a power supply state detection device and method that can appropriately detect the power supply state from the power supply waveform of the ACC power supply using a detection pattern suited to the vehicle. [Means for solving the problem]

[0009] A power supply state detection device according to one aspect of the present invention is characterized by comprising a power supply waveform acquisition unit that acquires a power supply waveform when the vehicle's ACC power supply is on or off, a dedicated detection pattern generation unit that generates a dedicated detection pattern for the ACC power supply being on or off based on the power supply waveform, and a power supply state detection unit that detects the power supply state of being on or off based on the dedicated detection pattern.

[0010] Furthermore, a power supply state detection method according to one aspect of the present invention is characterized in that a power supply waveform acquisition unit acquires a power supply waveform when the vehicle's ACC power supply is on or off, a dedicated detection pattern generation unit generates a dedicated detection pattern for the ACC power supply being on or off based on the acquired power supply waveform, a dedicated detection pattern memory unit stores the dedicated detection pattern, and a power supply state detection unit determines whether the ACC power supply is on or off based on the dedicated detection pattern. Effect of the Invention

[0011] According to the present invention, the power supply state can be appropriately detected from the power supply waveform of the ACC power supply using a detection pattern suited to the vehicle. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a diagram showing an example of the configuration of a power supply state detection device according to the present embodiment. [Diagram 2] FIG. 2 is a diagram showing an example of a detection pattern. [Diagram 3] FIG. 3 is a flowchart illustrating the dedicated detection pattern generation and storage process. [Figure 4] FIG. 4 is a flowchart illustrating the power supply state detection process. [Diagram 5] FIG. 5 is a diagram showing an example of the configuration of a power supply state detection system according to another embodiment. [Figure 6] FIG. 6 is a flowchart illustrating a dedicated detection pattern generation and storage process of the power supply state detection system. [Figure 7] FIG. 7 is a flowchart illustrating the power supply state detection process of the power supply state detection system. [Figure 8] FIG. 8 is a diagram for explaining a conventional method for detecting the power supply state of an ACC power supply. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] [One embodiment] The power supply state detection device according to the present embodiment will be described below. FIG. 1 is a block diagram showing a configuration example of an in-vehicle device 1, such as a drive recorder, mounted on a vehicle. Note that the embodiments described below each show a preferred specific example of the present invention. The numerical values, components, arrangement positions and connection forms of the components, processing order in the flow chart, and the like shown in the following embodiments are merely examples and are not intended to limit the present invention. Also, each figure is not necessarily a precise illustration.

[0014] The in-vehicle device 1 starts up when the ACC power supply 2 in the vehicle power supply device 3, such as a battery, is turned on, and executes the main function of the in-vehicle device 1. The vehicle power supply device 3 may also include other power supply systems, such as a constant power supply (not shown). The in-vehicle device 1 ends execution of its main function when the ACC power supply 2 is turned off. The in-vehicle device 1 has a drive control unit 11, a power supply state management unit 12, and a power supply circuit unit 13.

[0015] The drive control unit 11 controls the drive of each unit that executes the main function of the in-vehicle device 1.

[0016] The power supply state management unit 12, which serves as a power supply state detection device, detects the power supply state of the ACC power supply 2. Specifically, the power supply state management unit 12 detects whether the ACC power supply 2 is turned on or off, and outputs the detection result to the drive control unit 11.

[0017] The power supply circuit unit 13 supplies power supplied from the ACC power supply 2 to each unit of the in-vehicle device 1. The power supply circuit unit 13 has a voltage detection unit 31. The voltage detection unit 31 detects the voltage of the ACC power supply 2 and supplies it to the power supply state management unit 12 after, for example, performing A / D (analog / digital) conversion. When the ACC power supply 2 is turned on or off, the voltage detection unit 31 samples the voltage of the ACC power supply 2 at predetermined intervals for a predetermined period of time. For example, the voltage detection unit 31 samples the voltage of the ACC power supply 2 at 10 ms intervals for one second.

[0018] The power supply state management unit 12 acquires the power supply waveform when the ACC power supply 2 is turned on or off according to the sampling result by the voltage detection unit 31. The power supply state management unit 12 generates and stores a detection pattern for detecting the power supply state of the ACC power supply 2 based on the power supply waveform.

[0019] When the vehicle is started with the ignition key, the voltage of the ACC power supply 2 at the time of start-up drops suddenly and then rises due to the effect of the power supply current of the battery being supplied to the starting motor. This voltage fluctuation pattern can take various forms depending on the type of vehicle, the combination of the engine, motor, battery, etc., and the operating conditions of the electrical equipment, and not all of them necessarily have the same voltage fluctuation pattern. In other words, the detection pattern generated and stored by the power supply state management unit 12 is generated based on the power supply waveform obtained by sampling the voltage of the ACC power supply 2 of the vehicle in which the in-vehicle device 1 is mounted, and is therefore a detection pattern dedicated to that vehicle and model. Therefore, the detection pattern generated by the power supply state management unit 12 is called a dedicated detection pattern.

[0020] The power supply state management unit 12 can be realized by, for example, a CPU (Central Processing Unit), a working memory, and a non-volatile storage device (not shown) that stores a control program. The power supply state management unit 12 may be realized by a user-programmable integrated circuit such as an FPGA (field-programmable gate array) or a microcomputer. The power supply state management unit 12 functions as a power supply waveform acquisition unit 21, a dedicated detection pattern generation unit 22, a dedicated detection pattern storage unit 23, and a power supply state detection unit 24 by executing a control application program stored in the memory.

[0021] The power supply waveform acquisition unit 21 (hereinafter referred to as the acquisition unit 21) acquires the power supply waveform of the ACC power supply 2 from the voltage data of the ACC power supply 2 sampled by the voltage detection unit 31. In this example, if the sampled voltage is equal to or greater than a predetermined threshold voltage L, the value of that section is "1", and if it is less than the threshold voltage L, data is acquired in which the value of that section is "0".

[0022] Figure 2 shows an example of the voltage waveform of the ACC power supply 2. In the case of Figure 2A, a digital value of "10000011..." is obtained as the power supply waveform from the sampling results at 10 ms intervals. In the case of Figure 2B, a digital value of "10011001..." is obtained as the power supply waveform from the sampling results at 10 ms intervals.

[0023] The dedicated detection pattern generation unit 22 (hereinafter referred to as the generation unit 22) generates a dedicated detection pattern for detecting the power state of the ACC power supply 2. Specifically, the power supply state management unit 12 generates a dedicated detection pattern for detecting that the ACC power supply 2 has been turned on, and a dedicated detection pattern for detecting that the ACC power supply 2 has been turned off.

[0024] In the case of the power waveform shown in Figure 2A, the detection pattern is a pattern in which a "1" appears 50 ms after a "0" appears. In the case of the power waveform shown in Figure 2B, the detection pattern is a pattern in which a "1" appears 20 ms after a "0" appears, and then becomes a "1" 60 ms later.

[0025] The generating unit 22 can generate a dedicated detection pattern for detecting that the power waveform of the ACC power supply 2 on is equal to or higher than a predetermined voltage value for a predetermined period of time from a certain time (predetermined as a predetermined time) after the ACC power supply 2 is turned on. In the case of FIG. 2A, "1" appears 50 ms after "0" appears, and if the "1" continues for a predetermined period of time, a pattern in which "1" appears according to the predetermined period of time can be used as the dedicated detection pattern. Similarly, a dedicated detection pattern can be generated for detecting that the power waveform of the ACC power supply 2 off (not shown) is equal to or lower than a predetermined voltage value for a predetermined period of time after the ACC power supply 2 is turned off. The above-mentioned dedicated detection pattern is an example, but it is desirable to use a pattern that can efficiently detect the power supply state without sampling the voltage more than necessary as a pattern for detecting the power supply state of the ACC power supply 2 on or off during normal operation. This can suppress the processing load on the CPU and contribute to reducing power consumption.

[0026] The dedicated detection pattern storage unit 23 (hereinafter referred to as the storage unit 23) stores the dedicated detection pattern generated by the generation unit 22.

[0027] When a dedicated detection pattern is stored in memory unit 23, power supply state detection unit 24 (hereinafter referred to as detection unit 24) detects the power supply state of ACC power supply 2, i.e., whether it is on or off, based on the dedicated detection pattern. Assume that the dedicated detection pattern is a pattern in which "'1' appears 50 ms after a '0' appears," as in the case of FIG. 2A. In that case, when detection unit 24 is able to detect this dedicated detection pattern from the voltage data of ACC power supply 2, it determines that ACC power supply 2 is on. Assume also that the dedicated detection pattern is a pattern in which "'1' appears 20 ms after a '0' appears, and then another '1' appears 50 ms later," as in the case of FIG. 2B. In that case, when detection unit 24 is able to detect this dedicated detection pattern from the voltage data of ACC power supply 2, it determines that ACC power supply 2 is on.

[0028] If no dedicated detection pattern is stored in the memory unit 23, the detection unit 24 detects the power supply state of the ACC power supply 2 based on a predetermined detection pattern (hereinafter referred to as a general-purpose detection pattern). The general-purpose detection pattern is, for example, a pattern in which "1" appears 400 ms after "0" appears. In this example, the general-purpose detection pattern is assumed to be stored in the memory unit 23.

[0029] (Special detection pattern generation and storage process) The detection pattern generation and storage process of the power supply state management unit 12 will be described with reference to FIG.

[0030] When the ACC power supply 2 is turned on and the power supply state detection operation of the ACC power supply 2 is started, in step S11 the voltage detection unit 31 samples the voltage of the ACC power supply 2 every 10 ms for one second, for example. Next, in step S12, the acquisition unit 21 acquires a power supply waveform from the sampling result by the voltage detection unit 31, as described with reference to FIG.

[0031] In step S13, the generation unit 22 generates a dedicated detection pattern based on the power supply waveform acquired by the acquisition unit 21, as described with reference to FIG. 2, and in step S14, stores the generated dedicated detection pattern in the memory unit 23.

[0032] Thereafter, the detection pattern generation and storage process ends.

[0033] (Power supply state detection process) The power supply state detection process of the power supply state management unit 12 will be described with reference to FIG.

[0034] In step S21, when the ACC power supply 2 is turned on or off, the detection unit 24 determines whether a dedicated detection pattern is stored in the memory unit 23, and if a dedicated detection pattern is stored (step S21: Yes), in step S22, it detects the power state of the ACC power supply 2 using the dedicated detection pattern stored in the memory unit 23, and outputs a control signal indicating the detection result to the drive control unit 11.

[0035] If the dedicated detection pattern is not stored (step S21: No), in step S23, the detection unit 24 detects the power supply state of the ACC power supply 2 based on the general-purpose detection pattern.

[0036] When the power supply state of the ACC power supply 2 is detected in step S22 or step S23, the power supply state detection process ends.

[0037] [Other embodiments] Fig. 5 is a block diagram showing a configuration example of a power supply state detection system. The system includes an in-vehicle device 101 and a server 102. In the in-vehicle device 1 of Fig. 1, the in-vehicle device 1 itself generates a dedicated detection pattern, but in this example, the server 102 generates a dedicated detection pattern. In the configuration of the in-vehicle device 101 and the server 102, the same reference numerals are used for components having the same functions as those shown in Fig. 1.

[0038] The in-vehicle device 101 is provided with a power supply state management unit 111 instead of the power supply state management unit 12 of the in-vehicle device 1 of FIG.

[0039] The in-vehicle device 101 can communicate with the server 102 via a network (not shown) by the communication unit 112. The power supply state management unit 111 supplies information on the voltage waveform of the ACC power supply 2 and the model of the vehicle in which the in-vehicle device 101 is mounted to the server 102. The server 102 generates a dedicated detection pattern from the information on the voltage waveform of the ACC power supply 2 transmitted from the power supply state management unit 111, and stores the pattern in association with the model information transmitted from the power supply state management unit 111.

[0040] When detecting the power state of the ACC power source 2, if the power source state management unit 111 has stored a dedicated detection pattern, it detects the power state of the ACC power source 2 based on the dedicated detection pattern. If the dedicated detection pattern is not stored, the power source state management unit 111 transmits the model of the vehicle in which the in-vehicle device 101 is mounted to the server 102 and requests the server 102 to provide a dedicated detection pattern. When the server 102 receives the request to provide the dedicated detection pattern from the power source state management unit 111, it supplies the power source state management unit 111 with the dedicated detection pattern linked to the model of the vehicle in which the in-vehicle device 101 is mounted. The power source state management unit 111 detects the power state of the ACC power source 2 based on the dedicated detection pattern supplied from the server 102.

[0041] The power supply state management unit 111 includes a power supply waveform acquisition unit 21, a dedicated detection pattern storage unit 23, and a power supply state detection unit 24. The power supply state management unit 111 further includes a communication control unit 121 and a vehicle information acquisition unit 122.

[0042] The communication control unit 121 controls data transmission and reception with the server 102 via the communication unit 112. The vehicle information acquisition unit 122 reads and acquires information about the type of vehicle in which the in-vehicle device 101 is installed, which is stored in a memory (not shown), for example, from the memory.

[0043] The server 102 has a communication unit 161, a communication control unit 162, a dedicated detection pattern generation unit 163, and a dedicated detection pattern storage unit 164. The communication control unit 162 controls data transmission and reception with the in-vehicle device 101 via the communication unit 161. The dedicated detection pattern generation unit 163 has a function similar to that of the dedicated detection pattern generation unit 22 in Fig. 1. The dedicated detection pattern storage unit 164 has a function similar to that of the dedicated detection pattern storage unit 23 in Fig. 1.

[0044] (Special detection pattern generation and storage process) A dedicated detection pattern generation and storage process of the power supply state detection system will be described with reference to FIG.

[0045] When the ACC power supply 2 is turned on and the power supply state detection operation of the ACC power supply 2 is started, in step S31, the vehicle information acquisition unit 122 of the power supply state management unit 111 reads and acquires information about the type of vehicle in which the in-vehicle device 101 is installed, which is stored in, for example, a memory not shown, from the memory.

[0046] In step S32, the voltage detection unit 31 samples the voltage of the ACC power supply 2 every 10 ms for one second, for example. Then, the acquisition unit 21 acquires a power supply waveform from the sampling result by the voltage detection unit 31.

[0047] In step S33, the communication control unit 121 transmits the vehicle type information acquired in step S31 and the power supply waveform acquired in step S32 to the server 102 via the communication unit 112.

[0048] In step S34, the dedicated detection pattern generation unit 163 of the server 102 generates a dedicated detection pattern based on the power supply waveform transmitted from the in-vehicle device 101 and received by the communication unit 161. Then, in step S35, the dedicated detection pattern generation unit 163 stores the generated dedicated detection pattern in the dedicated detection pattern storage unit 164 in association with the vehicle model information transmitted together with the power supply waveform.

[0049] The process then ends.

[0050] (Power supply state detection process) The power supply state detection process of the power supply state management unit 111 will be described with reference to FIG.

[0051] When the ACC power supply 2 is turned on or off, in step S41, the detection unit 24 of the power supply state management unit 111 determines whether a dedicated detection pattern is stored in the memory unit 23 or not, and if a dedicated detection pattern is stored (step S41: Yes), in step S42, it performs power detection using the dedicated detection pattern stored in the memory unit 23, detects the power supply state of the ACC power supply 2, and outputs a control signal indicating the detection result to the drive control unit 11.

[0052] If the dedicated detection pattern is not stored (step S41: No), in step S43, the power state management unit 111 transmits the model of the vehicle in which the in-vehicle device 101 is mounted to the server 102 and requests the server 102 to provide the dedicated detection pattern. The server 102 supplies the power state management unit 111 with the dedicated detection pattern linked to the model of the vehicle in which the in-vehicle device 101 is mounted.

[0053] In step S44, the power state management unit 111 stores the dedicated detection pattern provided by the server 102 in the storage unit 23.

[0054] In step S45, the power supply state management unit 111 detects the power supply state of the ACC power supply 2 based on the dedicated detection pattern supplied from the server 102.

[0055] When the power supply state of the ACC power supply 2 is detected in step S22 or step S45, the power supply state detection process ends.

[0056] Although FIG. 5 shows only one in-vehicle device 101, multiple in-vehicle devices 101 and server 102 mounted on vehicles of various vehicle types can execute the above-mentioned process to ensure dedicated detection patterns for many vehicle types.

[0057] [Variations] (For use other than turning ACC power supply 2 on and off) The above-described embodiment has been described as an example of detecting fluctuations in the power supply waveform when the ACC power supply 2 is turned on or off, but the present invention is not limited to detecting fluctuations in the power supply waveform due to turning the ACC power supply 2 on and off.

[0058] (Timing of generation and storage process of dedicated detection pattern) Although no reference has been made to the timing of the generation and storage process of the dedicated detection pattern, it may be executed when the in-vehicle device 1 and the in-vehicle device 101 are installed in the vehicle and started for the first time. The power waveform of the ACC power source 2 may change depending on the deterioration state of the battery. In addition, the state of the battery may change depending on the influence of the high and low outside air temperature. For this reason, the generation and storage of the dedicated detection pattern may be executed at a timing when a fraction of the battery replacement period has elapsed, based on the battery replacement period, in response to the aging of the battery. In addition, the generation and storage of the dedicated detection pattern may be executed for each season or time period. Since the battery performance is generally considered to be deteriorated in the early morning during the coldest period, it is effective for stable operation to set the execution timing of the generation and storage process taking these factors into consideration. Furthermore, it is also possible to provide a predetermined operation button on the in-vehicle device 1 and the in-vehicle device 101, and to execute the generation and storage process of the dedicated detection pattern by operating the operation button.

[0059] [Summary of effects]

[0060] (1) The above-mentioned power supply state management unit 12 includes a power supply waveform acquisition unit 21 that acquires a power supply waveform when the ACC power supply 2 of the vehicle is on or off, A dedicated detection pattern generating unit 22 that generates a dedicated detection pattern for turning on or off the ACC power supply 2 based on a power supply waveform; a power supply state detection unit 24 that detects the power supply state (on or off) based on a dedicated detection pattern; Equipped with.

[0061] According to this configuration, a dedicated detection pattern for detecting the power state of the ACC power supply 2 is generated from the power waveform of the ACC power supply 2 of the vehicle, so that the power state of the ACC power supply 2 can be detected appropriately.

[0062] (2) In addition, the power supply state management unit 12 Further comprising a dedicated detection pattern storage unit 23 for storing a dedicated detection pattern, If the dedicated detection pattern is not stored in the dedicated detection pattern storage unit 23, the power supply state detection unit 24 detects the power supply state of the ACC power supply 2 based on a predetermined general-purpose detection pattern (step S23 in FIG. 4), When the dedicated detection pattern is stored in the dedicated detection pattern storage unit 23, the power supply state detection unit 24 judges the power supply state of the ACC power supply 2 based on the dedicated detection pattern stored in the dedicated detection pattern storage unit 23 (step S22 in FIG. 4). It is possible.

[0063] According to this configuration, if a dedicated detection pattern is stored, the power supply is detected using the stored dedicated detection pattern, but if no dedicated detection pattern is stored, the power supply state of the ACC power supply 2 can be detected using the general-purpose detection pattern set as default.

[0064] (3) In addition, the power supply state management unit 12 When the dedicated detection pattern is not stored in the dedicated detection pattern storage unit 23, the power supply waveform acquisition unit 21 acquires a power supply waveform of the ACC when the power supply is on or off, and the dedicated detection pattern generation unit 22 generates a dedicated detection pattern of the power supply being on or off based on the power supply waveform acquired by the power supply waveform acquisition unit 21 and stores the generated dedicated detection pattern in the dedicated detection pattern storage unit 23; The power supply state detection unit 24 detects the power supply state based on the dedicated detection pattern stored in the dedicated detection pattern storage unit 23. It is possible.

[0065] According to this configuration, even if a detection pattern corresponding to the model is not stored, the power supply state of the ACC power supply 2 can be detected using the dedicated detection pattern.

[0066] (4) In addition, the power supply state management unit 12 generating a dedicated detection pattern for detecting that a voltage value has exceeded a predetermined value based on a predetermined time period when a power waveform when the power is on has a voltage value exceeding a predetermined value for a predetermined period of time from a predetermined time after the ACC power supply 2 is turned on; When the power waveform when the power is off is below a predetermined voltage value for a predetermined period of time from a predetermined time after the ACC power supply 2 is turned off, a dedicated detection pattern is generated to detect that the voltage has fallen below a predetermined voltage value based on the predetermined time. It is possible.

[0067] According to this configuration, a dedicated detection pattern according to the power supply state of the ACC power supply 2 can be generated. [Explanation of symbols]

[0068] 1 In-vehicle device 2 ACC power supply 3 Vehicle power supply unit 11 Drive control unit 12 Power Status Management Unit 13 Power supply circuit section 21 Power waveform acquisition section 22 Dedicated detection pattern generator 23 Dedicated detection pattern memory section 24 Power supply status detector 31 Voltage detection section 101 In-vehicle equipment 102 Server 111 Power Status Management Unit 112 Communications Department 121 Communication control section 122 Vehicle Information Acquisition Unit 161 Communications Department 162 Communication control section 163 Dedicated detection pattern generator 164 Dedicated detection pattern memory section

Claims

1. a power supply waveform acquisition unit that acquires a power supply waveform when an ACC power supply of a vehicle is on or off; a dedicated detection pattern generating unit that generates a dedicated detection pattern for detecting whether the ACC power supply is on or off based on the power supply waveform; a power supply state detection unit that detects a power supply state (on or off) of the ACC power supply based on the dedicated detection pattern; A power supply state detection device comprising:

2. 2. The power supply state detection device according to claim 1, A dedicated detection pattern storage unit that stores the dedicated detection pattern, When the dedicated detection pattern is not stored in the dedicated detection pattern storage unit, the power supply state detection unit detects the power supply state of the ACC power supply based on a predetermined general-purpose detection pattern, When the dedicated detection pattern is stored in the dedicated detection pattern storage unit, the power supply state detection unit determines the power supply state of the ACC power supply based on the dedicated detection pattern stored in the dedicated detection pattern storage unit. A power supply state detection device comprising:

3. 3. The power supply state detection device according to claim 2, When the dedicated detection pattern is not stored in the dedicated detection pattern storage unit, the power supply waveform acquisition unit acquires a power supply waveform of the ACC power supply being on or off, and the dedicated detection pattern generation unit generates a dedicated detection pattern of the power supply being on or off based on the power supply waveform acquired by the power supply waveform acquisition unit and stores the generated dedicated detection pattern in the dedicated detection pattern storage unit; The power supply state detection unit detects the power supply state of the power source based on the dedicated detection pattern stored in the dedicated detection pattern storage unit. A power supply state detection device comprising:

4. 2. The power supply state detection device according to claim 1, generating a dedicated detection pattern for detecting that a power supply waveform when the ACC power supply is on has a voltage value equal to or higher than a predetermined voltage value for a predetermined period of time from a predetermined time after the ACC power supply is turned on, based on the predetermined time; When the power supply waveform when the ACC power supply is off continues to be a predetermined voltage value or less for a predetermined period from a predetermined time after the ACC power supply is turned off, a dedicated detection pattern is generated to detect that the voltage value is a predetermined voltage value or less based on the predetermined time. A power supply state detection device comprising:

5. The power supply waveform acquisition unit acquires a power supply waveform when the ACC power supply of the vehicle is on or off, A dedicated detection pattern generating unit generates a dedicated detection pattern for turning on or off the ACC power supply based on the acquired power supply waveform; a dedicated detection pattern storage unit stores the dedicated detection pattern; a power supply state detection unit that determines whether the ACC power supply state is on or off based on the dedicated detection pattern; A method for detecting a power supply state.

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