JP7270956B2 - drive recorder - Google Patents

Description

The present disclosure relates to a vehicle-mounted device and a drive recorder as the vehicle-mounted device.

In the aftercare of vehicle accidents, there is a large discrepancy between the claims of the parties to the cause of the accident, and the resolution of the accident does not progress smoothly. are doing. However, in the case of a drive recorder that also has a parking security function, if the drive recorder is operated for a long period of time while the vehicle is parked, there is a risk that the on-vehicle battery will run out.

Therefore, the drive recorder described in Patent Document 1 detects the voltage of the vehicle-mounted battery, and cuts off the power supplied from the vehicle-mounted battery to the drive recorder when the detected voltage is less than a predetermined value. In order to accurately detect the voltage of the vehicle battery, the drive recorder described in Patent Document 1 detects the voltage of the vehicle battery (that is, the open voltage) when the current flowing through the vehicle battery becomes zero.

JP 2017-102918 A

In order to accurately detect the voltage of the on-board battery, if the power supply from the on-board battery to the on-board device such as a drive recorder is cut off, the on-board device may malfunction. For example, if the vehicle-mounted device is a drive recorder, data recorded on a recording medium such as an SD card (registered trademark) in which images captured by the drive recorder are recorded may be garbled or damaged.

One aspect of the present disclosure aims to accurately detect the voltage of the vehicle battery and suppress the occurrence of problems caused by cutting off the power supply from the vehicle battery to the vehicle device.

One aspect of the present disclosure is a vehicle-mounted device that is mounted on a vehicle and includes a control unit, a power supply unit, a switching unit, and a detection unit. The control unit operates by being supplied with power. The power supply unit supplies power. The switching unit switches power supply to the control unit between a first supply route that supplies power from an onboard battery mounted on the vehicle to the control unit and a second supply route that supplies power from the power supply unit to the control unit. Switch the power supply route. The detection unit detects the voltage applied to the first supply path after the switching unit switches the power supply path to the control unit to the second supply path.

According to such a configuration, the voltage applied to the first supply path can be detected while the voltage drop in the first supply path is suppressed. Therefore, the voltage of the vehicle-mounted battery can be detected more accurately than the configuration that detects the voltage applied to the first supply path while power is being supplied through the first supply path. Further, when the detection unit detects the voltage, the power supply path is switched to the second supply path, so power supply to the control part is continued through the second supply path. Therefore, it is possible to suppress the occurrence of troubles caused by cutting off the power supply from the vehicle-mounted battery to the control unit. Therefore, it is possible to accurately detect the voltage of the vehicle-mounted battery, and suppress the occurrence of problems caused by cutting off the power supply from the vehicle-mounted battery to the vehicle-mounted device.

In one aspect of the disclosure, the power supply may be a capacitor. According to such a configuration, the power supply unit can be used repeatedly by charging the power supply unit. As a result, the vehicle-mounted device can be used for a long period of time as compared with a configuration in which the power supply unit cannot be charged.

In one aspect of the present disclosure, the control section and the detection section may be incorporated in one IC. According to such a configuration, it is possible to reduce the size of the vehicle-mounted device compared to a configuration in which the control section and the detection section are incorporated in separate ICs.

In one aspect of the present disclosure, the vehicle-mounted device is a drive recorder that records an image obtained by capturing at least a part of the surroundings of the vehicle, and the control unit receives power supply and performs imaging control and recording control of the image. may be configured to do so. According to such a configuration, when the drive recorder is installed in the vehicle, the voltage of the vehicle battery is accurately detected, and the occurrence of problems caused by cutting off the power supply from the vehicle battery to the drive recorder is suppressed. can.

In one aspect of the present disclosure, the control unit may stop imaging control and recording control when the voltage detected by the detection unit is less than a predetermined value. According to such a configuration, it is possible to prevent the in-vehicle battery from running down due to continuation of the imaging control and the recording control even though the voltage is less than the predetermined value.

1 is a block diagram showing the configuration of a recorder system; FIG. It is a block diagram which shows the functional structure of a control apparatus. 4 is a flowchart of voltage detection processing;

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this disclosure is demonstrated, referring drawings.
[1. composition]
A recorder system 1 shown in FIG. 1 is mounted on a vehicle. The recorder system 1 includes a drive recorder 2 , a vehicle battery 3 , a first supply channel 41 and a second supply channel 51 .

The drive recorder 2 includes a camera 21, a power supply unit 22, a memory drive 23, a changeover switch 24 and a control device 25, all of which are housed in a single compact housing 20.

The drive recorder 2 of the present embodiment can be attached to the rear surface of an indoor rearview mirror using a bracket or an adhesive, for example, in order to image mainly the front of the vehicle while the vehicle is running. Alternatively, the housing 20 may be attached to the inner surface of the windshield using a bracket or adhesive. Further, it can be attached to appropriate locations such as the upper surface of the instrument panel, the rear window glass, the upper surface of the rear parcel, etc., using fixing means such as tape.

The camera 21 is composed of a CCD camera or the like, and captures an image of at least part of the surroundings of the vehicle (front of the vehicle in this embodiment). The camera 21 outputs captured image data to the control device 25 .

The power supply unit 22 supplies power to each component in the drive recorder 2 . In this embodiment, power supply 22 is a capacitor. Note that the power supply unit 22 is charged while the ignition switch IGN is on.

The memory drive 23 records captured image data in a general-purpose portable recording medium such as an SD card 23a. When the latest image data is recorded after the recording capacity of the SD card 23a is full, the memory drive 23 is arranged such that the oldest image data is erased and the latest image data is endlessly recorded. controlled by Image data is constantly recorded on the SD card 23a while the drive recorder 2 is recording (hereinafter referred to as parking monitoring recording) while the vehicle is parked.

The changeover switch 24 is a switch that switches a power supply path to the control device 25 between a first supply path 41 and a second supply path 51 which will be described later.
The control device 25 is mainly composed of a well-known microcomputer having a CPU 25a and a semiconductor memory such as RAM, ROM, flash memory (hereinafter referred to as memory 25b). The control device 25 integrates and controls the operation of each component built in the drive recorder 2 . Various functions of the control device 25 are realized by the CPU 25a executing a program stored in a non-transitional substantive recording medium. In this example, the memory 25b corresponds to a non-transitional substantive recording medium storing programs. Also, by executing this program, a method corresponding to the program is executed.

From a functional point of view, the control device 25 comprises a control section 251 and a detection section 252 as shown in FIG. In this embodiment, the control unit 251 and the detection unit 252 are implemented using hardware that combines logic circuits, analog circuits, and the like. However, the method of realizing the control unit 251 and the detection unit 252 is not limited to hardware, and some or all of the elements may be realized using software. In this embodiment, the control unit 251 and the detection unit 252 are realized by one IC. In other words, the control section 251 and the detection section 252 are incorporated in one IC.

The control unit 251 is configured to perform imaging control and recording control of an image of the camera 21 upon receiving supply of power. The control unit 251 performs image pickup control, thereby controlling the start and end of image pickup by the camera 21 . Also, the control unit 251 performs recording control to control the start and end of storing the image of the camera 21 in the SD card 23a. Further, the control unit 251 controls the switch 24 to switch the power supply path to the control device 25 between the first supply path 41 and the second supply path 51 . The control device 25 and the changeover switch 24 are connected by a control line 26 , and the control unit 251 controls the changeover switch 24 by sending a control signal to the changeover switch 24 via the control line 26 .

The detector 252 is configured to detect the voltage applied to the first supply path 41 .
Further, the control device 25 executes a voltage detection process shown in FIG. 3, which will be described later, by executing a program stored in the memory 25b by the CPU 25a. Note that the number of microcomputers constituting the control device 25 may be one or more.

On the other hand, the in-vehicle battery 3 supplies electric power to various devices in the vehicle including the drive recorder 2 .
The first supply path 41 is a supply path for supplying power from the vehicle-mounted battery 3 to the control unit 251 in the drive recorder 2 .

The second supply path 51 is a supply path for supplying power from the power supply section 22 in the drive recorder 2 to the control section 251 . The second supply path 51 is built in the drive recorder 2 .
The first supply path 41 includes two first power lines 41a and 41b and two second power lines 41c and 41c.
1d. The two first power lines 41 a and 41 b are wired directly to the vehicle battery 3 . The two first power lines 41a and 41b are connected to the positive terminal 3a and the negative terminal 3b of the vehicle battery 3, respectively.

The two second power lines 41c and 41d are connected to the two first power lines 41a and 41b, respectively, behind a navigation device (not shown) installed in the vehicle. Also, the two second power lines 41 c and 41 d are connected to the control device 25 of the drive recorder 2 .

The second power lines 41c and 41d are thinner than the first power lines 41a and 41b, and voltage drop is likely to occur. When power is being supplied from the onboard battery 3 to the drive recorder 2 via the first supply path 41, a current of about 300 mA flows through the second power lines 41c and 41d. Therefore, a relatively large voltage drop occurs in the second power lines 41c and 41d. Therefore, even if the voltage applied to the first supply path 41 is detected while power is being supplied via the first supply path 41, the voltage of the vehicle-mounted battery 3 cannot be detected accurately.

Power is always supplied from the onboard battery 3 to the control device 25 through the first supply path 41 regardless of whether the ignition switch IGN is on or off. When the vehicle is parked, power supplied from the on-vehicle battery 3 through the first supply path 41 is used to perform parking monitoring recording.

On the other hand, the second supply path 51 includes two third power lines 51a and 51b. The two third power lines 51 a and 51 b are connected to the power supply section 22 . Also, the two third power lines 51 a and 51 b are connected to the control device 25 of the drive recorder 2 .

The first supply path 41 and the second supply path 51 share a part of the circuit. Specifically, the second power line 41c of the first supply path 41 and the third power line 51a of the second supply path 51 are connected to the control device 25 after joining each other. Further, the second power line 41d of the first supply path 41 and the third power line 51b of the second supply path 51 are connected to the control device 25 after joining each other.

The switch 24 described above is provided so as to switch the supply path of power supplied to the control device 25 between the first supply path 41 and the second supply path 51 . Specifically, the changeover switch 24 is provided on the second power line 41 c of the first supply path 41 and the third power line 51 a of the second supply path 51 . In a state where the changeover switch 24 is switched to the second power line 41c side of the first supply line 41 (the state of the changeover switch 24 indicated by the solid line L1 in FIG. 1), control is performed from the vehicle battery 3 via the first supply line 41 Power is supplied to device 25 . On the other hand, when the changeover switch 24 is switched to the third power line 51a side of the second supply line 51 (the state of the changeover switch 24 indicated by the dashed line L2 in FIG. 1), the power supply unit 22 supplies power to the controller 25 .

Here, when the engine stops, the alternator (generator) also stops, so if the parking surveillance recording is continued for a long time, the on-vehicle battery 3 may run out. When the onboard battery 3 is dead, the engine starter motor cannot be operated. Therefore, in this embodiment, the voltage V applied to the first supply path 41 is detected by the detection unit 252 of the control device 25, and parking monitoring recording is performed only when the voltage V is equal to or higher than a predetermined value. As will be described later, the detection unit 252 detects the voltage applied to the first supply path 41 after the switch 24 switches the power supply path to the control device 25 from the first supply path 41 to the second supply path 51. Detect V.

Specifically, the detection unit 252 of the control device 25 detects the voltage V applied to the first supply path 41 via the detection line 28 connecting the control device 25 and the first supply path 41 . The detection line 28 is connected to a location on the second power line 41 c of the first supply path 41 and closer to the onboard battery 3 than the changeover switch 24 .

The power terminal 27 of the drive recorder 2 of this embodiment is connected to the vehicle battery 3 by a connection circuit 61 via an ignition switch IGN. Control device 25 monitors whether ignition switch IGN is on or off via connection circuit 61 .

[2. process]
Next, voltage detection processing executed by the control device 25 will be described using the flowchart of FIG. The voltage detection process is performed at an appropriate timing while the power of the drive recorder 2 is on and the ignition switch IGN is off (that is, while parking surveillance recording is being performed). Note that the changeover switch 24 is switched to the second power line 41c side of the first supply path 41 at the start of the voltage detection process.

First, in S<b>101 , the control unit 251 controls the changeover switch 24 via the control line 26 to switch the power supply path to the control device 25 from the first supply path 41 to the second supply path 51 .
Subsequently, in S<b>102 , the detection unit 252 detects the voltage applied to the first supply path 41 via the detection line 28 .

Here, when S102 is executed, the power supply path to the control device 25 is switched to the second supply path 51, and the power supply to the control device 25 via the first supply path 41 is cut off. . Therefore, the voltage V applied to the first supply path 41 is detected while the voltage drop in the first supply path 41 is suppressed.

Subsequently, in S103, the control unit 251 determines whether or not the voltage V detected in S102 is equal to or greater than a predetermined value Th.
When the control unit 251 determines that the voltage V is equal to or higher than the predetermined value Th, the control unit 251 proceeds to S104 and continues the parking monitoring recording. When S104 is executed, the voltage detection process of FIG. 3 ends.

On the other hand, when the control unit 251 determines in S103 that the voltage V is not equal to or greater than the predetermined value Th (is less than the predetermined value Th), the control unit 251 proceeds to S105 and stops the parking monitoring recording. When S105 is executed, the voltage detection process of FIG. 3 ends.

[3. effect]
According to the embodiment detailed above, the following effects are obtained.
(1) In the present embodiment, the detection section 252 of the control device 25 applies power to the first supply path 41 after the switch 24 switches the power supply path to the control section 251 to the second supply path 51 . detected voltage.

When power is being supplied from the vehicle battery 3 to the drive recorder 2, it is difficult to accurately detect the voltage of the vehicle battery 3 even if the voltage applied to the first supply path 41 is detected. In particular, when the drive recorder 2 is installed at a position relatively distant from the vehicle battery 3 inside the vehicle, the drive recorder 2 is connected to the second power lines 41c and 41d wired from the back of the navigation device (not shown) inside the vehicle. As a result, power is supplied from the vehicle-mounted battery 3 to the drive recorder 2 . However, the second power lines 41c and 41d are thinner than the first power lines 41a and 41b that are directly connected to the vehicle battery 3, and voltage drop is likely to occur. Therefore, even if the voltage V applied to the first supply path 41 is detected while power is being supplied from the vehicle battery 3 to the drive recorder 2, the voltage of the vehicle battery 3 cannot be detected accurately.

In this respect, according to the configuration of the present embodiment, the power supply to the drive recorder 2 from the first supply path 41 is cut off, that is, the voltage drop in the first supply path 41 is suppressed. The voltage V applied to path 41 is detected. Therefore, the voltage of the vehicle-mounted battery 3 can be accurately detected.

Further, when the detection unit 252 detects the voltage V applied to the first supply path 41, the power supply path to the control unit 251 is switched from the first supply path 41 to the second supply path 51. Power supply to the control unit 251 is continued through the supply path 51 . Therefore, it is possible to suppress the occurrence of problems caused by cutting off the power supply from the in-vehicle battery 3, such as garbled or damaged data recorded in the SD card 23a. Therefore, it is possible to accurately detect the voltage V of the vehicle-mounted battery 3 and suppress the occurrence of problems caused by cutting off the power supply from the vehicle-mounted battery 3 .

(2) In this embodiment, the power supply unit 22 is a capacitor. Therefore, by charging the power supply unit 22, the power supply unit 22 can be used repeatedly. As a result, the drive recorder 2 can be used for a long period of time compared to a configuration in which the power supply unit 22 cannot be charged.

(3) In this embodiment, the control section 251 and the detection section 252 are incorporated in one IC. Therefore, the size of the drive recorder 2 can be reduced compared to a configuration in which the control section 251 and the detection section 252 are incorporated in separate ICs.

(4) In this embodiment, the vehicle-mounted device is the drive recorder 2, and the control unit 251 is configured to receive power supply and perform imaging control and recording control of the image captured by the camera 21. . Therefore, when the drive recorder 2 is mounted on the vehicle, it is possible to accurately detect the voltage of the vehicle battery 3 and prevent the occurrence of problems caused by cutting off the power supply from the vehicle battery 3 to the drive recorder 2 .

(5) In this embodiment, the control unit 251 stops the imaging control and the recording control when the voltage V detected by the detection unit 252 is less than the predetermined value Th (S105). Therefore, it is possible to prevent the in-vehicle battery 3 from running down due to continuation of the imaging control and recording control despite the voltage V being less than the predetermined value Th.

In this embodiment, the drive recorder 2 corresponds to an example of the vehicle-mounted device, and the changeover switch 24 corresponds to an example of the switching unit.
[4. Other embodiments]
Although the embodiments for implementing the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments and can be implemented with various modifications.

(1) In the above embodiment, the drive recorder 2 is illustrated as the vehicle-mounted device, but the vehicle-mounted device may be a device other than the drive recorder. Specifically, for example, the vehicle-mounted device may be a device other than the drive recorder that operates using the accessory power supply of the vehicle. In other words, the vehicle-mounted device may be a device other than the drive recorder that can be used while the engine of the vehicle is stopped. Such an on-vehicle device includes, for example, an anti-theft device that outputs an alarm or the like when an occurrence of theft is detected.

(2) In the above-described embodiment, the power supply unit 22 is exemplified by a capacitor, but the power supply unit is not limited to this, and the power supply unit may be, for example, a battery or the like.
(3) In the above embodiment, the control unit 251 and the detection unit 252 are incorporated in one IC, but the method of mounting the control unit and the detection unit is not limited to this. For example, each of the controller and detector may be incorporated in separate ICs.

(4) In the above embodiment, the control device 25 determines whether or not a predetermined time has passed since the ignition switch IGN was turned off. The voltage V applied to the first supply path 41 after the supply path of power to is switched to the second supply path 51 may be detected.

Various in-vehicle accessories are also connected to the in-vehicle battery 3 . When the ignition switch IGN is turned off, the current flowing from the vehicle-mounted battery 3 to various vehicle-mounted accessory devices gradually decreases over time. For this reason, by detecting the voltage V applied to the first supply path 41 after a predetermined time has elapsed since the ignition switch IGN was turned off, it is compared with a configuration in which the voltage V is detected immediately after the ignition switch IGN is turned off. As a result, the voltage of the on-vehicle battery 3 can be detected more accurately.

(5) In the above embodiments, part or all of the functions executed by the control device 25 may be configured as hardware using one or a plurality of ICs or the like.
(6) In addition to the control device 25 described above, a system having the control device 25 as a component, a program for causing a computer to function as the control device 25, and a non-transitional substantive record such as a semiconductor memory in which the program is recorded The present disclosure can also be implemented in various forms such as a medium, a method of detecting the voltage V applied to the first supply path 41 according to the above embodiment, and the like.

(7) A plurality of functions possessed by one component in the above embodiment may be realized by a plurality of components, or a function possessed by one component may be realized by a plurality of components. . Also, a plurality of functions possessed by a plurality of components may be realized by a single component, or a function realized by a plurality of components may be realized by a single component. Also, part of the configuration of the above embodiment may be omitted. Moreover, at least part of the configuration of the above embodiment may be added or replaced with respect to the configuration of the other above embodiment. It should be noted that all aspects included in the technical idea specified by the wording in the claims are embodiments of the present disclosure.

DESCRIPTION OF SYMBOLS 1... Recorder system, 2... Drive recorder, 3... Vehicle-mounted battery,
22... Power supply unit, 24... Changeover switch, 25... Control device, 41... First supply path,
51... Second supply path, 251... Control section, 252... Detection section.

Claims (4)

A drive recorder mounted on a vehicle for recording an image of at least part of the surroundings of the vehicle ,
a control unit configured to perform imaging control and recording control of the image by receiving supply of electric power;
a power supply unit that supplies power;
between a first supply path for supplying power from an onboard battery mounted on the vehicle to the control section and a second supply path for supplying power from the power supply section to the control section; a switching unit for switching the power supply path of
a detection unit that detects the voltage applied to the first supply path after the power supply path to the control unit is switched to the second supply path by the switching unit;
A drive recorder with The drive recorder according to claim 1,
The drive recorder, wherein the power supply unit is a capacitor. The drive recorder according to claim 1 or claim 2,
A drive recorder in which the control unit and the detection unit are incorporated in one IC. The drive recorder according to any one of claims 1 to 3 ,
The drive recorder, wherein the control unit stops the imaging control and the recording control when the voltage detected by the detection unit is less than a predetermined value.

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