KR101043936B1

KR101043936B1 - Vehicular black box system with automatic mode change function by sensing vehicle's long term non-movement using acceleration sensor

Info

Publication number: KR101043936B1
Application number: KR1020100012613A
Authority: KR
Inventors: 김병규
Original assignee: 예성 주식회사
Priority date: 2010-02-11
Filing date: 2010-02-11
Publication date: 2011-06-30

Abstract

PURPOSE: A vehicle black box system offering a park mode converting function using an acceleration sensor is provided to improve the accuracy of impact determination and the reliability of product. CONSTITUTION: A vehicle black box system offering a park mode converting function using an acceleration sensor comprises an acceleration sensor(10), a recording device(20), and a control circuit(30). The recording device comprises a camera and a storage media. The recording device takes and saves an external image in high definition. The control circuit determines the accidents based on the measured value of the acceleration sensor and operates the recording device. The control circuit comprises a parking mode determining unit(31), a standard value transform unit(32), a power control unit(33), and a driving mode determining unit(34).

Description

Vehicular black box system with automatic mode change function by sensing vehicle's long term non-movement using acceleration sensor}

The present invention relates to a vehicle black box system, using an acceleration sensor and a battery voltage change circuit, the vehicle black capable of automatically converting between the parking mode and the driving mode without the user's separate operation while minimizing the power consumption when operating in the parking mode. It is about a box system.

The vehicle black box system is an automatic image recording system for detecting the impact applied to the vehicle, and recording and storing the external image of the impact point for use in post-processing such as investigation of the cause of the accident.

Recently, as vehicles are advanced and expensive, vehicles that are equipped with such a black box system for vehicles are more effectively dealing with accidents or crimes against vehicles.

Above all, a black box system for a vehicle should be designed to prevent malfunctions by accurately setting an impact threshold value to start recording, and to accurately determine an accident. The black box system should be designed with a structure that minimizes power consumption because it uses power in the vehicle.

In addition, since it is an automatic recording device, the result should not be influenced by the user's mistake, so it must be able to fundamentally block the user's involvement in the operation.

However, in the conventional vehicle black box system, the driving mode and the parking mode are operated without distinction, or the user is manually set to switch to the parking mode, so the accuracy of the judgment of the accident according to the change of situation is reduced and the user's There is always a possibility of error in the result of a misoperation.

In addition, the power consumption problem due to the high power structure that requires long time recording is an obstacle to the activation of the automotive black box system market.

The present invention provides a vehicle black box system that can minimize the power consumption of the vehicle black box system and allow the optimum shock reference value to be set together with the automatic switching of the mode according to the situation to improve the accuracy of the impact judgment and the reliability of the product. For the purpose.

The present invention includes an acceleration sensor for measuring the strength of the impact applied to the vehicle, a recording device for capturing and storing an external image of the impact point, and a circuit for determining the impact by receiving the acceleration sensor measurement value and controlling the recording device. For example, in a vehicle black box system configured to automatically record a corresponding point when a vehicle is impacted, power is always used, regardless of whether the vehicle is started or not, and the control circuit uses the acceleration sensor measurement value. A parking mode determination unit which determines whether the amount of change lasts for a predetermined time below the threshold and automatically switches from the driving mode to the parking mode; And a reference value converting unit for automatically changing a reference value for determining whether an impact is determined when the mode is switched according to a preset value. In addition, if the amount of change of the acceleration sensor measurement value is maintained for a predetermined time below a threshold, by automatically switching from the driving mode to the parking mode and by changing the reference value (impact reference value) of the impact determination is lower than in the driving mode In addition, the automatic switching of the parking mode using the acceleration sensor and the sensitivity to the shock during the parking mode can be improved to improve the accuracy of the judgment, and the changed shock reference value is configured to be restored to the original state when switching to the driving mode. It provides a vehicle black box system.

In this case, the control circuit further includes a power control unit, so as to cut off power to components other than the acceleration sensor in the parking mode to reduce the power consumption, so that the recording can be automatically rebooted when the shock of the acceleration sensor is detected. Can be configured.

In addition, the control circuit may further include a driving mode determination unit, it may be configured to enable the automatic switching from the parking mode to the driving mode by detecting a change in battery voltage according to the start of the vehicle.

According to the present invention, by performing the automatic conversion to the parking mode by using the acceleration sensor used for shock detection, it is possible to accurately switch to the parking mode without the user's intervention, and the shock reference value suitable for the parking mode is set to determine the impact It can dramatically improve the accuracy of the.

In addition, the parking mode has the advantage of minimizing the power consumption because it is the structure to cut off the power of the remaining components except the acceleration sensor and its control circuit.

1 is a block diagram of a vehicle black box system according to the present invention.

The present invention is an acceleration sensor (G sensor) for measuring the strength of the impact applied to the vehicle, a recording device for recording and storing the external image of the impact point, and receives the acceleration sensor measurement value to determine the impact and control the recording device Including a circuit to the vehicle, the vehicle black box system configured to automatically record the point when the impact to the vehicle, it is meaningful to improve the automatic switching of the parking mode and to minimize the power consumption.

1 is a block diagram of a black box system for a vehicle according to the present invention, which includes an acceleration sensor 10, a recording device 20, and a control circuit 30, and power is supplied from a constant power source 40. The information of the battery 50 is used.

The present invention operates separately from the vehicle battery 50 by using a constant power source (e.g. emergency light power source, external battery) irrespective of whether the vehicle is started.

Such a separate power supply structure can prevent the inconvenience of rebooting upon starting of the vehicle, and enables independent and stable operation of the black box.

The acceleration sensor 10 is a sensor for measuring the impact amount of the three axes (x, y, z) applied to the vehicle, the control circuit 30 determines the impact amount of the sensor 10 to determine whether or not an accident situation. In case of an accident, the recording apparatus is driven.

As such, since the vehicle black box system using the acceleration sensor can perform recording only when it is determined to be an accident, accurate determination of the control circuit and quick restart operation of the recording device are very important.

Accurate determination of the control circuit is to determine whether the correct judgment for each situation according to the shock reference value that is the criterion for determining whether an accident, the present invention is to distinguish the driving mode and parking mode to automatically set the shock reference value for each mode To help.

The recording device 20 is a part including a camera and a storage medium, and should be capable of capturing and storing an external image in high resolution.

The control circuit 30 of the present invention is a part for driving the recording apparatus 20 by determining whether an accident is based on the measured value of the acceleration sensor 10, and in the present invention, the parking mode determination unit 31 and the reference value conversion. The unit 32 further includes a power supply control unit 33 and a driving mode determination unit 34.

The parking mode determination unit 31 is configured to automatically detect whether the vehicle is parked, and the variation amount of the acceleration sensor 10 measured value is sensed below a threshold value in all of x, y, z, and axes, and this state If a predetermined time (eg 30 seconds) lasts, determine the parking mode.

In other words, it determines the parking mode based on the change amount and its duration and automatically switches.

When the vehicle is switched to the parking mode, the reference value converting unit 32 automatically changes the reference value (impact reference value) for judging whether or not the shock is appropriately set to a preset value suitable for parking so that accurate determination of the control circuit is possible.

The changed shock reference value is a lower value than in the driving mode, which is intended to increase the shock sensitivity of the control circuit because a small shock can be seen as an accident in the parking mode with little impact.

The shock reference value can be set collectively when the system is installed, and can be changed and set during use according to the use environment.

The changed shock reference value is automatically restored to its original state when it is switched from the parking mode to the driving mode, and the setting value suitable for the driving mode is reset.

In addition, in parking mode, the situation is stable because the vehicle is standing still and the complexity of the situation is reduced, and the impact sensitivity is increased.

Therefore, when the power control unit 33 is switched to the parking mode, power is cut off for components other than the acceleration sensor (including its control circuit part) to reduce power consumption, and the shortest time when the acceleration sensor detects an impact (eg Automatically reboot within 2 seconds) to configure recording.

In the parking mode, since the shock reference value is lowered and the shock sensitivity is high, the switching to the driving mode further includes a driving mode determination unit 34 as a battery voltage change detection circuit in the control circuit 30, so as to start the vehicle. When the battery voltage change is detected, it is configured to automatically switch from parking mode to driving mode.

As described above, the present invention enables the automatic conversion between the parking mode and the driving mode without the user's separate operation while minimizing the power consumption when operating in the parking mode by using the acceleration sensor and the battery voltage change detection circuit.

10: acceleration sensor 20: recording device
30: control circuit 31: parking mode determination unit
32: reference value conversion unit 33: power control unit
34: driving mode determination unit 40: constant power
50: car battery

Claims

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The vehicle includes an acceleration sensor for measuring the intensity of the impact applied to the vehicle, a recording device for capturing and storing an external image of the impact point, and a circuit for determining whether the impact is received by receiving the acceleration sensor measurement value and controlling the recording device. In a vehicle black box system that is configured to automatically record a point when an impact occurs,
The power source is always powered by the vehicle regardless of whether the vehicle is started or not.
The control circuit may include: a parking mode determination unit determining whether the amount of change of the acceleration sensor measurement value lasts a predetermined time below a threshold value and automatically switches from the driving mode to the parking mode; And a reference value converting unit for automatically changing the reference value of the impact determination when switching modes according to a preset value. Including, when the state in which the variation amount of the acceleration sensor measurement value is detected below the threshold value in all of the x, y, z, axis continues for a predetermined time, the driving mode is automatically switched to the parking mode, driving the reference value of the impact determination In the case of the mode, by changing lower, the automatic switching of the parking mode using the acceleration sensor and the sensitivity to the shock in the parking mode can be improved to improve the accuracy of the judgment of the accident. Configure to recover to the original state when switching to the mode,
The control circuit further comprises a driving mode determination unit, the vehicle black box system, characterized in that configured to enable automatic switching from the parking mode to the driving mode by detecting a battery voltage change according to the start of the vehicle.