JP2012166600A - On-board electronic equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide on-board electronic equipment that effectively records data while preventing a battery of a vehicle from running out.SOLUTION: When the vehicle is determined to be in a travel state where a charge amount to an on-board battery 11 is insufficient in a travel state detection unit 6, a power supply control unit 4 stops power supply to an on-board audio device 1 once a record of a section forming part of data during recording has been completed in a data record unit 2b.

Description

  The present invention relates to an in-vehicle electronic device having a function of recording data.

  As an in-vehicle electronic device mounted on a vehicle, for example, there is an in-vehicle audio device. Some in-vehicle audio apparatuses have a function of recording music data recorded on a CD-ROM onto a hard disk. In such an in-vehicle audio apparatus, there is known a method of continuing power supply so that when the accessory switch is turned off, the operation is not forcibly stopped even during recording. For example, see Patent Document 1).

Japanese Patent Laid-Open No. 10-336892

  By the way, among users who drive vehicles, there are people who frequently turn on and off the ignition switch in daily life and drive for a short time. When the vehicle is repeatedly operated for a short time as described above, the amount of power consumed by starting the engine, in-vehicle electrical components, and the like may be larger than the amount of power charged in the in-vehicle battery by a generator (alternator) or the like. is there. For this reason, there is a problem that sufficient charging time for the in-vehicle battery cannot be secured as compared with a case where the vehicle is frequently operated for a long time (that is, an operation in which the ignition switch is repeatedly turned on and off in daily life).

  In this way, when the charging time of the in-vehicle battery cannot be secured sufficiently, if the recording operation such as recording is continued by supplying power from the in-vehicle battery even after the accessory switch is turned off as in Patent Document 1, more power consumption is consumed. Will be invited. Therefore, in the case of a vehicle that frequently repeats short-time driving, there is a risk that the battery will run out early.

  Further, in order to avoid the above problem of battery exhaustion, for example, a method of interrupting recording immediately after the accessory switch is turned off may be employed. However, this method has a problem in that data being recorded is reset and re-executed from the beginning (re-recording), and data cannot be recorded efficiently.

  In view of the above-described problems, an object of the present invention is to provide an in-vehicle electronic device that can efficiently perform data recording while suppressing battery running out of a vehicle.

  In order to solve the above-mentioned object, the in-vehicle electronic device according to claim 1 includes a power control means for controlling power supply from a vehicle battery to the in-vehicle electronic device, and a running state of the vehicle in which a charge amount to the battery is Traveling state determination means for determining whether or not the traveling state is low, and the power supply control means records data when the traveling state determination means determines that the battery is in a traveling state with a small amount of charge. The power supply to the in-vehicle electronic device is stopped when the recording of the section forming a part of the data being recorded by the means is completed.

  According to this configuration, when it is determined that the driving state of the vehicle is a driving state with a small amount of charge to the battery, the recording of the section that forms part of the data being recorded by the data recording unit is completed. By stopping the power supply to the vehicle-mounted electronic device at that time, it is possible to efficiently record data while suppressing the battery from running out of the vehicle.

  According to a second aspect of the present invention, there is provided an in-vehicle electronic device comprising: a chargeable state determining unit that determines whether or not the battery is in a chargeable state; and the charge state of the battery is set to be higher than a predetermined voltage that guarantees starting of the vehicle. Battery state determining means for determining whether or not the threshold voltage is equal to or higher than the threshold voltage, the chargeable state determining means determines that the battery is in a chargeable state, and the battery state determining means is less than the threshold voltage. If determined, the power supply control means stops the power supply to the in-vehicle electronic device when the section recording is completed.

  According to this configuration, even when the battery is in a chargeable state, if the voltage is less than the threshold voltage, the process of stopping the power supply to the in-vehicle electronic device is executed when the section recording is completed. Thereby, it is possible to efficiently record data while more reliably preventing the battery from running out.

  The on-vehicle electronic device according to claim 3, when the chargeable state determination unit determines that the charging is impossible and the battery state determination unit determines that the voltage is equal to or higher than the threshold voltage, the power supply control unit The power supply to the in-vehicle electronic device is stopped when the recording of the section is completed.

  According to this configuration, even when the battery is equal to or greater than the threshold value, if charging is not possible, the process of stopping the power supply to the in-vehicle electronic device is executed when the recording of the section is completed. Thereby, it is possible to efficiently record data while preventing the battery from running out.

  Further, the traveling state determination means for the in-vehicle electronic device according to claim 4 determines whether or not the vehicle is traveling with a small amount of charge to the battery, based on a time until the ignition switch of the vehicle is turned on to off. It is characterized by.

  According to this configuration, it is possible to determine from the traveling state of the vehicle that the amount consumed is larger than the amount that the battery is charged (that is, the charging time of the in-vehicle battery cannot be sufficiently secured).

  According to a fifth aspect of the present invention, the traveling state determining means determines whether or not the battery is traveling with a small amount of charge based on whether or not a switch operated by the user is pressed. It is a feature.

  According to this configuration, it can be determined that the amount of consumption is larger than the amount of charge of the battery, reflecting the user's intention.

  In the in-vehicle electronic device according to claim 6, when the battery voltage becomes lower than a predetermined voltage for guaranteeing the start of the vehicle, the recording of the section forming a part of the data being recorded by the data recording means is incomplete. Even if it exists, the power supply to a vehicle-mounted electronic device is stopped by a power supply control means.

  According to this configuration, since the power supply to the in-vehicle electronic device can be stopped when the battery voltage becomes less than a predetermined voltage that ensures the start of the vehicle, it is possible to more reliably suppress the battery from running out of the vehicle.

1 is an overall view of an in-vehicle audio apparatus according to an embodiment of the present invention. It is a flowchart which shows the control processing of the whole vehicle-mounted audio apparatus in one Embodiment of this invention. FIG. 3 is a flowchart showing a detailed control process of a data recording process (step S3) when the vehicle-mounted audio device of FIG. 3 is a flowchart showing a detailed control process of a data recording process (step S4) when the vehicle-mounted audio apparatus of FIG. 2 is in a traveling state with a large amount of charge to a battery according to one embodiment.

  A schematic configuration of an in-vehicle audio apparatus 1 according to an embodiment of the present invention is shown in FIG.

  The in-vehicle audio apparatus 1 (corresponding to the in-vehicle electronic device of the present invention) in FIG. 1 is configured with a computer 9 as a center, and includes a switching unit 10, a multimedia unit 2, and an output unit 3, and includes an in-vehicle battery 11, an audio selection switch 12, The key switch 13 is connected to each via a communication line.

  The in-vehicle battery (+ B) 11 is connected to the in-vehicle audio device 1 through a power line, and power is supplied to each unit (multimedia unit 2, output unit 3, computer 9) in the in-vehicle audio device 1 via the switching unit 10. Supply. Moreover, the vehicle-mounted battery 11 transmits the signal which shows a battery voltage (remaining battery voltage) to the battery state determination part 5 of the vehicle-mounted audio apparatus 1 via a communication line.

  The audio selection switch 12 is a switch that is selected when it is determined by the user that the vehicle-mounted battery 11 is in a traveling state with a small amount of charge. By depressing the selection switch, a signal indicating that the driving state is low is transmitted to the driving state determination unit 6 of the in-vehicle audio apparatus 1 via the communication line.

  The key switch 13 is an ignition switch used as a switch for starting and stopping the engine. The key switch 13 transmits a signal indicating ON / OFF of the switch to the chargeable state determination unit 7 via the communication line.

  Further, when the key switch 13 (in this case, the ignition switch) is turned on and the engine (not shown) starts to rotate, the generator (not shown) starts generating electricity by the rotation of the engine. The electric power generated by this generator is stored in the in-vehicle battery 11. Further, when the ignition switch is turned off, the engine is stopped, and the generator is configured to stop power generation. The maximum voltage of the in-vehicle battery 11 used in this embodiment is 12V.

  As will be described in detail later, the computer 9 includes a power control unit 4 (corresponding to the power control means of the present invention) that controls power supply from the in-vehicle battery 11 to each unit of the in-vehicle audio device 1, and the state of charge of the battery A battery state determination unit 5 (corresponding to the battery state determination means of the present invention) that determines whether or not the threshold voltage is higher than a predetermined voltage that guarantees starting, and the amount of charge to the in-vehicle battery 11 is small A traveling state determination unit 6 (corresponding to the traveling state determination unit of the present invention) that determines whether or not the vehicle is in a traveling state, and a chargeable state determination unit 7 that determines whether or not the in-vehicle battery 11 is in a chargeable state (the present invention). And a recording control unit 8 (corresponding to the data recording control means of the present invention) for controlling the data recording process (ripping process). The above-mentioned “predetermined voltage for guaranteeing the start of the vehicle” specifically refers to a voltage for guaranteeing the start of the engine, and is defined as 10 V in the present embodiment. This voltage of 10V is a voltage having a margin more than a voltage (for example, 9V) at which the engine cannot be started. Furthermore, the threshold voltage of “threshold voltage set higher than a predetermined voltage for guaranteeing vehicle start-up” is to stably operate the recording control unit 8 that controls data recording processing (also referred to as ripping processing). It is a necessary voltage and may be a voltage higher than “predetermined voltage for guaranteeing vehicle start-up” = 10V. In this embodiment, the threshold voltage is set to 11 V in consideration of power consumption of other in-vehicle devices used in addition to the in-vehicle audio apparatus 1.

  The computer 9 is configured as a well-known microcomputer, and includes a ROM in which programs related to the above-described control processing and determination processing are recorded, a CPU that executes the programs, and a RAM that temporarily stores processing data. Has been. Furthermore, the computer 9 includes an interface unit and the like, and is configured to exchange various information.

  The switching unit 10 supplies / cuts off the power supply circuit (not shown) for supplying necessary power to each unit (multimedia unit 2, output unit 3, computer 9) and power from the in-vehicle battery 11 to each unit. A switch (not shown) is provided. This switch is controlled by the power supply control unit 4 of the computer 9 through the communication line, and based on the determination results of the battery state determination unit 5, the traveling state determination unit 6, and the chargeable state determination unit 7, Control power supply.

  Although not shown, power is supplied so that each part operates when the main power switch is turned on, and power supply to each part is stopped when the main power switch is turned off.

  In the multimedia unit 2, a data reading unit 2a for reading music data of a medium such as a CD-ROM or DVD-ROM, and a music medium read from a medium such as a CD-ROM or DVD-ROM are recorded on a recording medium (non-volatile memory or the like). ) Is recorded from a data recording section 2b (corresponding to the data recording means of the present invention). This data recording function is performed by the recording control unit 8, which extracts digital audio data recorded on a medium such as a CD-ROM or DVD-ROM in which music is stored, and is used for car navigation, personal computers, etc. A recording process (ripping process) is performed in which the file format is converted into a format that can be processed by the file.

  Although not shown, the multimedia unit 2 includes function switches (such as a playback switch, a recording start switch, a recording stop switch, a recording continuation switch, and a recording setting switch) for operating the functions of the multimedia unit 2. The read music data is output to the output unit 3 including the display unit 3a and the speaker unit 3b via a communication line. Since such a general function of the multimedia unit 2 uses a known configuration as described in a patent document (Japanese Patent Laid-Open No. 2005-349900), a detailed description thereof is omitted here.

  The output unit 3 includes a display unit 3a and a speaker unit 3b. The display unit 3a has a display function of a liquid crystal display (or may be an organic EL display or a plasma display), and is based on a signal received from the power supply control unit 4 or a signal transmitted from the multimedia unit 2. Display characters and images on the LCD screen. Further, the speaker device 3b includes a speaker that generates sound and sound, and a single sound such as a beep (BEEP) sound, music, sound, etc. according to a signal received from the power supply control unit 4 or a signal received from the multimedia unit 2. Various sounds are output.

  Specifically, based on the signal received from the recording control unit 8, the output unit 3 indicates that “recording of all data has been completed” when recording of all sections of data has been completed, or when interruption processing has been completed. A notification such as “Recording is interrupted and terminated for securing the battery charging pressure” is displayed on the screen of the display unit 3a in text display. Further, the output unit 3 notifies the display unit 3a of “forcibly ending the in-vehicle audio device 1 because the battery voltage has dropped significantly” for notifying the in-vehicle audio device 1 forcibly ending (notifying that recording is not permitted). In character display on the screen. Note that instead of the character display, the speaker unit 3b may notify the user by voice or beep sound.

  Next, control processing executed by the computer 9 of the in-vehicle audio apparatus 1 in the present embodiment will be described using the flowchart of FIG.

  First, when a recording system switch (recording start button, recording continuation button) among the function switches of the multimedia unit 2 is operated, this processing starts.

  In step S1, information for determining whether or not the vehicle-mounted battery 11 is in a traveling state with a small amount of charge is acquired. Here, when the traveling state determination unit 6 receives a signal selected by operating the audio selection switch 12, the process proceeds to step S2.

  The timing when the user presses the audio selection switch 12 is performed immediately after the recording system switch is operated. At this time, the output selection unit 3 may notify the user by pressing the audio selection switch 12 using video or audio. The timing of pressing the audio selection switch 12 is not limited to this. For example, the audio selection switch 12 may be pressed before this process is started.

  In step S2, based on the information received in step S1, the traveling state determination unit 6 determines whether or not the traveling state in which the charge amount to the in-vehicle battery 11 is small. If the traveling state determination unit 6 determines that the vehicle-mounted battery 11 is in a traveling state with a small amount of charge, the power supply control unit 4 causes the recording control unit 8 to perform a recording process in a traveling state with a small amount of battery charge. Instruct (proceed to step S3). When the driving state determination unit 6 determines that the in-vehicle battery 11 is not in a driving state with a small amount of charge, the power supply control unit 4 causes the recording control unit 8 to perform a recording process in a driving state in which the charging amount of the battery is not low. (Proceed to step S4).

  Then, when the process of step S3 or step S4 described later is completed, this process (recording process) is ended (END).

  As described above, by dividing the data recording process depending on whether the vehicle driving state is a driving state in which the in-vehicle battery 11 is charged to a small amount, the driving state of the user using the vehicle (battery charging state) ) Appropriate recording processing can be performed. The driving state with a small amount of charge of the battery means that the battery used for starting the engine is consumed more than the charge or is operated for a long time by frequently repeating the ignition on / off in a short period of time, for example. Even in this case, the battery consumption is greater than the charging by using many on-vehicle devices that require a large amount of power such as an air conditioner. Also, the driving state with a large amount of battery charge means that the ignition is turned on / off less frequently by continuously operating for a long time, and the battery consumption is less than the charge by not using an on-vehicle device such as an air conditioner. Refers to the case.

  Next, the detailed control process of the data recording process (step S3) when it determines with it being a driving | running | working state with little charge amount to the vehicle-mounted battery 11 of FIG. 2 using the flowchart of FIG.

  In step S401, the recording control unit 8 starts a data recording process (ripping process), and the process proceeds to step S402.

  In the present embodiment, one song is defined as one section among a plurality of songs recorded on a medium such as a CD-ROM or a DVD-ROM, and will be described below.

  In step S402, the chargeable state determination unit 7 determines whether or not the in-vehicle battery 11 is in a chargeable state in order to determine whether or not the data recording process can be continued. If it is in a chargeable state (here, the key switch 13 is on) (YES), the process proceeds to step S404, and if it is not in a state where charging is possible (the key switch 13 is changed to an off state) (NO), Proceed to step S403.

  In step S403, it is determined whether or not it is equal to or higher than a threshold voltage (11V) set higher than a voltage value that ensures vehicle start (engine start). That is, if the recording process is continued when the voltage is lower than the threshold voltage (11 V), it is determined that the start of the vehicle cannot be guaranteed, and the process proceeds to step S410 which is a process for stopping the recording process. In the subsequent step S410, the recording control unit 8 is incapable of continuing the recording process, so that the recording control unit 8 instructs the output unit 3 to notify the information that discontinues recording (forcibly terminating the process). In S <b> 412, the power control unit 4 outputs a signal for stopping power supply to each unit to the switching unit 10, and finishes data recording (stopping power supply to each unit by switch control of the switching unit 10). To end this process.

  On the other hand, if it is equal to or higher than the threshold voltage (11 V) in step S403, there is a margin with respect to the voltage value that guarantees the start of the vehicle, but since the battery is not in a chargeable state, the process proceeds to the data recording interruption process in step S406.

  On the other hand, in step S404, when it is determined in step S402 that the in-vehicle battery 11 is in a chargeable state, the recording control unit 8 confirms whether the data recording of the music to be recorded (all sections) is completed. Do. If the recording has not been completed (NO), the process proceeds to step S405. If the recording is completed (YES), the process proceeds to step S411, and the recording control unit 8 instructs the output unit 3 to notify that the data recording of all sections has been completed. After step S411, the process proceeds to step S412 to perform data recording termination processing (stopping power supply to each unit by switch control of the switching unit 10), and this processing is terminated.

  In step S405, in order to determine whether or not the data recording process is continued at the time of recording, the voltage of the in-vehicle battery 11 is set to a predetermined threshold voltage (here, a battery voltage margin remains for the same reason as in S403 above). The battery state determination unit 5 determines whether or not the above is set.

  If the voltage value of the in-vehicle battery 11 is 11V or more, it is determined that recording can be continued (YES), the process returns to step S402, and the processes of steps S402 to S405 are repeated. If the voltage value of the in-vehicle battery 11 is less than 11V, the process proceeds to the data recording interruption process in step S406.

  In step S406, the recording control unit 8 performs data recording interruption processing. Here, the section that is being recorded at the start of the process in S406 is controlled to end the recording process when the recording is completed. That is, if there is a section that is being recorded at the start of the process in S406, the recording process is continued with the goal of completing the recording process in that section, and the process proceeds to step S407. If the section recording is completed, the process proceeds to step S407 as it is.

  In step S407, the recording control unit 8 confirms whether the recording process (data recording interruption process) of the section being recorded is completed. If the data recording interruption process has been completed (YES), the process proceeds to step S411. In step S411, the recording control unit 8 instructs the output unit 3 to notify that the predetermined recording has been completed. Thereafter, the process proceeds to step S412, where the power supply control unit 4 performs a process of ending data recording, and the process ends. If the recording process for the section being recorded is not completed (NO), the process proceeds to step S408.

  Each time step S407 is executed, recorded information and unrecorded information for data used for the next re-recording are stored in a memory unit (not shown). By processing in this way, the data recording process can be resumed smoothly the next time the vehicle is used.

  In step S <b> 408, the battery state determination unit 5 determines whether or not the state of charge of the battery is equal to or higher than a voltage value (10 V in this case) that ensures starting of the vehicle.

  When the voltage value of the battery is 10 V or more (YES), it is determined that the recording of the section currently being recorded can be continued, the process returns to step S406, and the processes of steps S406 to S408 are repeated. The recording process is performed while checking the battery status.

  If the battery voltage value is less than 10V in step S408, if the recording process is continued as it is, the key switch 13 may not be turned on at the next on-operation (the engine start cannot be guaranteed) ( NO), the process proceeds to step S409. It should be noted that the voltage (10V) that guarantees the start of the engine used for the determination in step S408 is a voltage having a margin more than the voltage (for example, 9V) at which the engine cannot be started.

  In step S409, the recording control unit 8 instructs to notify the output unit 3 that recording continuation is not permitted. Thereafter, in step S412, the power supply control unit 4 performs a process of terminating data recording (stopping the power supply to each unit by switch control of the switching unit 10), and the process ends.

  As described above, in this embodiment, when the recording process of the section being executed is completed while the recording process of the section is completed, the power supply to the in-vehicle audio device 1 is interrupted, thereby increasing the battery. The data can be recorded efficiently while suppressing this.

  Further, by including the processing of step S402 and step S405, even if the battery is in a chargeable state, if the voltage is less than the threshold voltage, the power to the in-vehicle audio device 1 is recorded when the section recording is completed. Supply can be stopped. Thereby, it is possible to efficiently record data while more reliably preventing the battery from running out.

  Furthermore, by having the processing of step S402 and step S403, even if the battery is above the threshold value, if charging is not possible, the power supply to the in-vehicle audio device 1 is stopped when the recording of the section is completed. Can be made. Thereby, it is possible to efficiently record data while preventing the battery from running out.

  In addition, when the in-vehicle battery 11 becomes less than the voltage (10V) that guarantees the engine start (step S408), even if the data recording process is not completed, the on-board battery 11 is more securely installed by forcibly suspending. The battery 11 can be prevented from running out.

  Next, the detailed control process of the data recording process (step S5) when it determines with it being a driving | running | working state with much charge amount to the vehicle-mounted battery 11 of FIG. 2 using the flowchart of FIG.

  In step S501, similarly to step S401, the data recording process is started by the recording process of the recording control unit 8, and the process proceeds to step S502.

  In step S502, the recording control unit 8 confirms whether data recording of all sections is completed based on information from the multimedia unit 2. If the recording has not been completed (NO), the process proceeds to step S503. If the recording has been completed (YES), the process proceeds to step S505. In step S505, the recording control unit 8 instructs the output unit 3 to notify that the predetermined recording is completed. In step S506, the power supply control unit 4 performs a process of ending data recording, and ends the process.

  On the other hand, in step S503, as in step S408, the battery state determination unit 5 determines whether or not the state of charge of the battery is equal to or higher than a voltage value (10V in this case) that ensures starting of the vehicle.

  If the voltage value of the battery is 10 V or higher, recording can be continued (YES), the process returns to step S502, and the processes of steps S502 to S503 are repeated. If the battery voltage value is less than 10 V (NO), the process proceeds to step S504.

  In step S504, after instructing the recording control unit 8 to notify the output unit 3 that the recording continuation is not permitted, the power source control unit 4 terminates data recording in step S506 (switching unit 10). The power supply to each part is stopped by switch control), and this process is terminated.

  Thus, when the vehicle is in a traveling state with a large amount of charge to the in-vehicle battery 11 (for example, when ignition is turned on / off in a cycle of a long period (several hours)), the charge is sufficiently higher than the battery consumption. Therefore, a recording process similar to the conventional one can be adopted (that is, recording for each section can be performed without worrying about the remaining battery level).

  As described above, the embodiment of the in-vehicle electronic device according to the present invention has been described. However, the present invention is not limited to the above-described embodiment, and the gist of the invention according to each claim of the claims. Applicable as long as it does not deviate.

  For example, part or all of the functions of the in-vehicle audio 1 may be realized by other in-vehicle electronic devices (for example, a car navigation device).

  Further, in the present embodiment, data recording by recording has been described, but the present invention can be similarly applied to recording of video data such as map information.

  The present invention can also be suitably applied to recording data downloaded and acquired through communication with an external device in order to update data recorded in the vehicle diagnostic device in a database or the like corresponding to the data recording unit 2a. .

  Moreover, although the key switch 13 was demonstrated using the ignition switch, it may also contain an accessory switch (not shown). When the accessory switch is on, the vehicle engine is stopped and the in-vehicle battery 11 is not in a chargeable state, but each part of the in-vehicle audio device 1 is operable (that is, when each part is activated, The power will continue to be consumed without being charged). In the present embodiment, the accessory switch OFF state is the same as the ignition switch OFF state.

  Furthermore, the driving state determination unit 6 may be a method other than receiving selection switch information of the audio selection switch 12 (step S1 in FIG. 2).

  For example, as a modification of step S1 in FIG. 2, the traveling state determination unit 6 receives information based on the ignition switch operation of the key switch 13 (receives a switch on / off signal via the communication line 100 (broken line) in FIG. Then, it may be determined whether or not the traveling state of the vehicle is a traveling state in which the amount of charge to the battery is small. A modification of step S1 will be specifically described below. Counts the time from when the traveling state determination unit 6 receives the key switch 13 (in this case, the ignition switch) on signal until it receives the ignition switch off signal, and records the counted data in the memory unit. To do. This recorded time count data is cumulatively recorded in time series, and when the cumulative number of records reaches, for example, 10 records, the average time count data obtained by calculating the average value of the latest 10 records is displayed. Further recorded in the memory unit. If the value of the average time count data is equal to or less than a predetermined value (here, 10 minutes), it is determined that the traveling state of the vehicle is a traveling state in which the amount of charge to the battery is small. Moreover, if it exceeds the predetermined value, it is determined that the traveling state of the vehicle is a traveling state in which the amount of charge to the battery is large.

  In addition to such a time, for example, the average travel distance count data may be similarly obtained and determined using distance instead of the average time count data.

  As yet another example, the traveling state determination unit 6 receives a voltage per unit time (for example, every minute) of the in-vehicle battery 11 (receives a voltage signal via the communication line 101 (broken line) in FIG. 1), The received voltage is cumulatively recorded in the memory unit. If it is determined from the latest 10-minute data at the time of determination that the voltage is decreasing, it may be determined that the battery is in a traveling state with a small amount of charge.

  As described above, the determination of whether or not the traveling state determination unit 6 is in a traveling state in which the amount of charge to the battery is small is not an operation of the audio selection switch 12 by the user, but is automatically determined, thereby bothering the user's switch operation. In addition to eliminating this, it can be judged on an objective basis.

  Further, in step S412 of FIG. 3 or step S506 of FIG. 4, the power supply control unit 4 performs all the processes for stopping the power supply to each unit by the switch control of the switching unit 10, but this is not restrictive. . For example, when the remaining amount of the battery is sufficiently present (has 11 V or more), the present process may be terminated without performing the power supply stop process. In this way, the next media recording process can be performed promptly without restarting the apparatus.

  Further, in the process of stopping the power supply to each unit by the switch control of the switching unit 10, the multimedia unit 2, the output unit 3, and the computer 9 are all stopped. Alternatively, the power supply may be partially stopped according to the remaining amount of the battery, such as by stopping only the output unit 3.

  Furthermore, in the present embodiment, the description has been made assuming that one song = 1 section, but the present invention is not limited to this, and one song may be composed of a plurality of sections.

DESCRIPTION OF SYMBOLS 1 Car-mounted audio apparatus 2 Multimedia part 3 Output part 4 Power supply control part 5 Battery state determination part 6 Running state determination part 7 Chargeable state determination part 8 Recording control part 9 Computer 10 Switching part 11 Car-mounted battery 12 Operation switch group 13 Key switch

Claims (6)

An in-vehicle electronic device equipped with a data recording means for recording data, and a data recording control means for recording data of a recording medium in the data recording means.
Power control means for controlling power supply from the vehicle battery to the in-vehicle electronic device;
Traveling state determination means for determining whether or not the traveling state of the vehicle is a traveling state with a small amount of charge to the battery,
The power supply control unit records a section that forms part of the data being recorded by the data recording unit when the running state determination unit determines that the battery is in a traveling state with a small amount of charge. When the operation is completed, power supply to the in-vehicle electronic device is stopped. Chargeable state determination means for determining whether or not the battery is in a chargeable state;
Battery state determination means for determining whether or not the state of charge of the battery is equal to or higher than a threshold voltage set higher than a predetermined voltage that ensures the start of the vehicle;
When the recording of the section is completed by the power supply control unit when the chargeable state determination unit determines that the battery is in a chargeable state and the battery state determination unit determines that the voltage is less than a threshold voltage The power supply to the said vehicle-mounted electronic device is stopped by the vehicle-mounted electronic device of Claim 1 characterized by the above-mentioned. Chargeable state determination means for determining whether or not the battery is in a chargeable state;
Battery state determination means for determining whether or not the state of charge of the battery is equal to or higher than a threshold voltage set higher than a predetermined voltage that ensures the start of the vehicle;
The time when the recording of the section is completed by the power supply control means when it is determined by the chargeable state determination means that the charging is impossible and the battery state determination means is determined to be a threshold voltage or higher. The power supply to the said vehicle-mounted electronic device is stopped by the vehicle-mounted electronic device of Claim 1 characterized by the above-mentioned.   The said running state determination means determines whether it is driving | running | working with little charge amount to the said battery based on the time until the ignition switch of the said vehicle turns off from on. 4. The in-vehicle electronic device according to any one of 3 above.   4. The traveling state determination unit according to claim 1, wherein the traveling state determination unit determines whether the traveling is performed with a small amount of charge to a battery based on whether a switch operated by a user is pressed. The vehicle-mounted electronic device of any one of Claims.   When the battery voltage is less than a predetermined voltage for guaranteeing the start of the vehicle, the power control is performed even if the recording of the section forming a part of the data being recorded by the data recording means is not completed. 6. The on-vehicle electronic device according to claim 2, wherein power supply to the on-vehicle electronic device is stopped by means.

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