KR20160079520A - Black box for inquire into cause of sudden acceleration incidents using standard obd interface - Google Patents

Abstract

The present invention relates to an accident recording device to investigate a cause of sudden unintended acceleration by using a standard OBD communication method, capable of checking whether a driver steps on an acceleration pedal or brake pedal in a sudden unintended acceleration situation by collecting data for the investigation of a cause of sudden unintended acceleration and additionally detecting operational data of the brake pedal, while preventing damage to vehicle information by collecting vehicle data through connection with a DLC of the vehicle but being connected to every vehicle regardless of manufacturers or models through standard OBD2 communication. According to the present invention, the accident recording device includes: a cable (10) connected to the DLC (1) of the vehicle; a braking force sensing unit detecting information to check whether the braking pedal is operated or not; and an external storage collecting and storing driving information of the vehicle (velocity, engine rpm, operational quantity of the acceleration pedal, opening degrees of a throttle valve, a battery voltage, at least one among air pressure and intake flux in an intake manifold, and a pedal position) as well as storing an operational state of the braking pedal, measured through the braking force sensing unit.

Description

Technical Field [0001] The present invention relates to an accident recording apparatus for identifying a cause of a sudden acceleration using a standard OBD communication method.

The present invention relates to an accident recording apparatus for identifying a cause of a sudden acceleration, and more particularly, to an accident recorder for collecting data of a vehicle connected to a DLC of a vehicle and communicating with a standard OBD2 method, The OBD communication method can be used to collect the data for identifying the cause of the sudden departure without detecting the damage of the vehicle information and separately detecting the operation data of the brake pedal to check whether the driver has pressed the accelerator pedal or the brake pedal And an accident recording device for identifying the cause of the sudden occurrence.

So far, the cause of the sudden acceleration of the vehicle has not been clarified, and the techniques to prevent it are constantly being studied.

However, despite the fact that various suddenly-avoided technologies are being studied and applied to real cars, it is still a reality that sudden accidents are still occurring. Even though the cause of such a sudden occurrence is not only in the driver's driving immaturity, It is a reality to be transferred to the driver.

The fundamental cause of these problems is that the technology of the apparatuses related to the sudden development has been focused on merely preventing sudden emergencies and is not a technique for identifying the cause of the sudden emergence.

Techniques for identifying causes of sudden emergencies include the following.

Vehicle accident recorder EDR (Event Data Recorder) is a storage program in ACU (Airbag Control Unit) which is an electronic control unit connected to a car airbag device. When a collision occurs at a certain speed or more, the airbag is blown up Lt; / RTI >

However, since the EDR (Event Data Recorder) stores the driving situation when the airbag mounted on the vehicle is operated, data can not be secured if the airbag is not operated in a sudden accident, and the storage time is short There is a problem that it is difficult to analyze the precise accident situation due to the lack of storage items. For example, in the event data recorder (EDR), the data indicated as "break on" indicates that the braking force is not generated, This is why the EDR data alone can not be used to judge that the driver has stepped on the braking pedal properly. This is because it is not possible to prove whether the driver stepped on the braking pedal correctly because the EDR data is marked as brake on even if the pedal is slightly raised on the brake pedal.

EDR is mandatory in the US in September 2012, but it is not possible to pinpoint the cause of sudden emergence by excluding important items such as engine speed and accelerator pedal opening.

As another technology, it is difficult to accurately grasp the driving situation of the black box.

Patent Document 1 (Japanese Patent Application Laid-Open No. 10-1014-0035101) discloses a vehicle black box, an infrared ray sensor interlocked with the vehicle black box for detecting presence or absence of a driver, and an opening / closing sensor for detecting opening / A camera for taking a picture of a driver's brake and an accelerator operation state before and after the start of the vehicle under the control of the vehicle black box on the basis of a detection signal of the detection sensor, And a battery used as an operating power source for the black box for vehicle and the camera for sudden shooting. Most of sudden incidents occur at the beginning of vehicle operation, (Dead time), it is forced recording for a certain period of time before the start of the vehicle, However, since it is only the operation situation of the brake and the accelerator, there is a limit to grasp the driving situation, and the degree of operation of the brake and the accelerator can not be precisely checked. There is a problem that the reliability is low.

Patent Document 2 (Registration No. 10-0752627) discloses a diagnostic connector attached to a Diagnostic Link Connector (DLC) of an engine control unit (ECU) of a vehicle. A signal analyzer connected to the diagnostic connector for analyzing state information of the vehicle from the sensor output signals of the vehicle and outputting the analyzed state information; The analysis signal output from the signal analyzing unit is detected to determine a sudden acceleration state when a sudden increase in rotation speed is detected at a crank position sensor (CPS: Crank Position Sensor) of more than a predetermined value, A controller for storing sensor measurement information about a predetermined time in a storage unit when a collision is detected by the collision sensor; A key input unit connected to the control unit and receiving a user control command; A power supply unit receiving power from a diagnostic connector (DLC) of the vehicle from the diagnostic connector; An A / D converter for transmitting a voltage value of the power supply unit to the control unit; A storage unit connected to the control unit and storing user input information, driving software, and sensor measurement information; A display unit connected to the control unit and displaying a measurement value of each sensor, whether it is suddenly generated, A collision sensor connected to the control unit and measuring an occurrence of a collision when the vehicle is in a collision; An actuator connected to the control unit to shut off the vehicle power when the control unit determines that the vehicle is in a sudden acceleration state; (Braking S / W), which is connected to the DLC of the vehicle and collects data for identifying the cause of the sudden acceleration from the ECU of the vehicle (whether the brake is operated by the brake S / W) (OBD-II), it is troublesome to analyze many kinds of protocols according to manufacturers, vehicle models, and new car launches.

Published Japanese Patent Application No. 10-1014-0035101 Patent No. 10-0752627

Disclosure of Invention Technical Problem [8] The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a vehicle control system , It is possible to collect the data for identifying the cause of the sudden departure and detect the operation data of the brake pedal separately so as to confirm whether the driver depresses the accelerator pedal and the brake pedal when the vehicle suddenly rises. The purpose of the accident recorder is to provide.

An accident recording apparatus for identifying a cause of a sudden acceleration using a standard OBD communication method according to the present invention comprises: a cable connected to a DLC of a vehicle; A braking pedal sensor for detecting information for confirming whether the braking pedal is operated; (The vehicle speed, the engine speed, the accelerator pedal actuation amount, the throttle valve opening amount, the battery voltage, the air pressure in the intake manifold, and the intake air flow rate) by communicating with the cable and the DLC through the standard OBD2 system, And an external storage for storing an acceleration measured through the brake pedal sensor.

According to the accident recording apparatus for identifying the cause of the sudden acceleration using the standard OBD communication method according to the present invention, information that can identify the cause of the sudden driving in connection with the DLC of the vehicle can be acquired and collected through the OBD2 communication method It is possible to precisely identify whether the vehicle is suddenly driven due to inactivity of the driver by collecting the operation of the brake without using a separate sensor (acceleration sensor, etc.) and providing information to accurately determine the state of the vehicle and the operation state of the driver (Vehicle speed, engine speed, accelerator pedal actuation amount, throttle valve opening amount, battery voltage, air pressure in the intake manifold, and intake air flow rate) regardless of the vehicle manufacturer or the model of the vehicle. Or more, the pedal position) by acquiring the information that can identify the cause of the sudden acceleration The availability of the product in accordance with the shared use of a car is very good and even non-experts can use with a simple task to connect the DLC connector and so has the effect of inducing the active dissemination.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a configuration of an accident recording device for identifying a cause of a sudden onset by using a standard OBD communication method according to the present invention; FIG.
FIG. 2 is a graph showing a case in which acceleration is accelerated in a steep acceleration in a steady state. FIG.
FIG. 3 is a graph showing a case where the driving wheels slide when the vehicle is rapidly accelerated from a stop state. FIG.

As shown in FIG. 1, an accident recording apparatus 100 for identifying a cause of a sudden acceleration based on a standard OBD communication method according to the present invention includes a cable 10 connected to a DLC 1 of a vehicle, a cable 10 DLC (Direct Attached Storage (DAS) 20 connected to the Diagnostic Link Connector 1 and collecting and storing driving data of the vehicle through communication in the standard OBD2 system, for example, DAS (Direct Attached Storage) And an acceleration sensor 30 for enabling or disabling operation.

The cable 10 is provided at one end thereof with a connector to be connected to the DLC 1 which is a diagnostic connection connector of an engine control unit (ECU) of the vehicle and the other end to be connected to the DAS 20, DAS (20).

It is preferable that the cable 10 has a flexible length so as to be applicable irrespective of various mounting positions of the DAS 20 and has flexibility and elasticity so as not to break when the vehicle collides with the vehicle. .

The cable 10 is not fixed to the DAS 20 but can be detachably connected through a connector.

The DAS 20 communicates with the DLC 1 to collect and store vehicle data and communicate in the standard OBD2 manner.

There are three methods of communication for collecting DLC and data of the vehicle.

One is CAN communication that communicates with the electronic devices inside the vehicle, two are the extended OBD-II, which is used to communicate when using the diagnostic for maintenance, and the third is the standard OBD2 used as the international standard.

The standard OBD2 method has the advantage of collecting common vehicle data irrespective of the vehicle manufacturer and the vehicle model, and is related to emission regulation, so that data collection of the vehicle is free compared to other communication methods. For example, the CAN and extended OBD-II methods can compromise vehicle data and electronic equipment when unauthorized data collectors are connected, but the standard OBD2 method can be used without restriction as it does not compromise vehicle data. Do.

However, it is not possible to identify the cause of sudden acceleration only by the data of the vehicle collected through the standard OBD2 method, because it is very important whether or not the brake pedal is operated by the driver in order to identify the cause of the sudden acceleration. Can not be confirmed.

Through the standard OBD2 method, the following vehicle data is collected.

Load calculation value, malfunction code, engine coolant temperature, engine speed, vehicle speed, malfunction indicator light, absolute load value, fuel level (only if it affects the operation of the monitoring device), engine electronic control system Indication of the voltage (battery voltage), air-fuel ratio (equivalence ratio), catalyst temperature (only for direct measurement), monitoring execution, operating time after engine start, malfunction indicator, operating distance after malfunction code clearance, malfunction Fuel pressure correction value, fuel pressure, ignition advance amount, intake air temperature, intake air pressure in intake manifold, intake flow rate, throttle position sensor output value, secondary air supply state , Oxygen sensor output, air-fuel ratio sensor output, atmospheric temperature, evaporation gas system vapor pressure, purge valve operation instruction instru- ment, error between measured value and measured value of exhaust gas recirculation device, pedal position sensor value 33 items).

The present invention uses the following data to identify the causes of sudden emergencies among the data of 33 items collected through the standard OBD2 method. Among the above 33 items, the following 7 items are collected and used to identify the cause of sudden occurrence. Since the standard OBD2 system is designated as the same item irrespective of the manufacturer and the vehicle model, only the seven items necessary for the present invention are received and stored. Of course, although all 33 items may be authorized and stored, the present invention considers the non-economic aspect of using large storage for storage of items not required in the present invention.

1. Engine speed: Check engine condition through engine speed.

2. Vehicle speed: Check the condition of the engine and transmission through the speed of the vehicle (the number of revolutions of the driving wheel).

3. Malfunction indicator lights: Check the status of the engine.

4. BATTERY VOLTAGE: Check battery voltage for associativity related to engine operation (Surge, etc.).

5. Air pressure and intake air flow in the intake manifold: Check the relationship between the operation of the brake pedal and the occurrence of high engine power, based on the pressure and the air volume in the intake manifold. (If the throttle valve opens suddenly, )

This data collects the air pressure or inspiratory flow in the intake manifold via the standard OBD method and can be analyzed with the acceleration sensor value to determine whether the brake pedal is working and when it is operating correctly.

6. Throttle position sensor output value: Check the opening amount of the throttle valve.

7. Pedal position sensor value: To check the operation amount of the accelerator pedal, it is possible to check accurately whether the driver pressed the accelerator pedal. In addition, it can be easily checked whether there is a sudden acceleration by analyzing it in conjunction with the throttle valve value.

The DAS 20 collects data of the vehicle from the DLC 1 at regular intervals of time, collects vehicle data (four times per second) at intervals of 0.25 seconds, for example, through a timer, The period is not limited to the above-described numerical values and can be variously changed.

The DAS 20 may be configured to store the data of the stored vehicle only for a predetermined period of time, for example, for 2 to 3 days, without permanently storing the data.

The power supply method of the accident recording apparatus according to the present invention is supplied with power through a connection with the DLC, and is operated only from the time when the power is supplied until the power is interrupted. For example, DAS can be stored for 24 hours, so you can store data for 2 to 3 days depending on the driver's driving time. If a vehicle suddenly emerges, it can help to analyze the vehicle's symptoms (it is very likely that there are some signs of anomalies in advance) from two to three days in advance.

The DAS 20 is mounted inside a hard case and is protected. The DAS 20 is preferably attached to the floor under the driver's seat through an adhesive sheet or the like so as not to be damaged during a collision such as a sudden vehicle accident.

The DAS 20 is an example of an external storage for collecting and storing data of a vehicle by communicating with the DLC 1 in an OBD2 manner, and can use all products that perform the same function.

The DAS 20 includes a communication unit for communicating with the DLC 1 in a standard OBD2 mode, a storage unit for storing data collected through the communication unit, a timer, and data stored in the storage unit to an external storage device such as a USB A connection port for transmitting data, a reset unit for initializing the storage unit, and the like.

Preferably, the hard case has a built-in DAS 20 mounted therein, and a cushioning material is applied to the inside and outside of the hard case to protect the DAS 20 in case of a vehicle collision due to sudden driving or the like.

The acceleration sensor 30 detects the speed change of the vehicle and the intensity of the impact (movement of the vehicle body). It can not be collected through the standard OBD2 method, and it is necessary to determine whether the brake pedal is operated by the driver (Acceleration value integration) is measured when the vehicle is suddenly accelerated and the driving wheel slips, thereby helping to accurately analyze the accident and to ascertain how hard the driver has stepped on the brake pedal have.

The acceleration sensor 30 is installed on the internal PCB of the DAS 20.

2 and 3 are graphs of simulation results for confirming the necessity of an acceleration sensor. In the graph of FIG. 2, the graph is normally accelerated at a rapid acceleration in a steady state, and the graph of FIG. It is when the wheel slips.

The difference between FIG. 2 and FIG. 3 is as follows.

FIG. 3 shows that the vehicle speed measured in the OBD is the same as the vehicle speed measured in the OBD when the vehicle is rapidly accelerated and slid on the road surface. This indicates that the vehicle speed integrated with the measured value from the acceleration sensor is different. Since the existing accident analysis is based on the OBD vehicle speed, it is said that all parts of the measured value are erroneously measured as 4 ~ 50km / h increased within 1 second, claiming that the data is not reliable. However, the OBD vehicle speed is indicated by the rapid increase of the vehicle speed due to the slip of the tire, but if there is an acceleration sensor, the actual vehicle speed (the body speed) can be accurately confirmed by integrating the acceleration. Also, the reliability of the measured data is not compromised.

By collecting at least one of Manifold Air Pressure (MAP) and Manifold Air Fliw (MAF) through the standard OBD2 method and analyzing this information and the information by the acceleration sensor, It is possible to more clearly confirm whether or not the brake pedal is operated. For example, if the position of the accelerator pedal and the change in the movement and acceleration of the vehicle due to the measurement of the acceleration sensor are checked at the time when the air pressure in the intake manifold becomes high, the driver does not step on the brake pedal and presses the accelerator pedal, .

A camera for photographing the brake pedal is also possible because it can confirm whether the brake pedal is operated by the driver. It is also preferable that the camera is capable of a mode position capable of capturing an angle change of the braking pedal clearly, and that the braking pedal and the accelerator pedal can be photographed together with an angle change.

The operation of the accident recording device for identifying the cause of the sudden acceleration using the standard OBD communication method according to the present invention is as follows.

1. Installation of the accident recording device of the present invention.

The connector of the cable 10 is connected to the DLC 1 of the vehicle and the cable 10 is hidden under the floor sheet under the driver's seat and the main body made of the DAS 20 and the hard case is attached do.

2. Initialization.

After the installation of the accident recording apparatus 100 is completed, the DAS 20 is reset (initialized) by operating the reset switch. The reason for resetting the device is to set the acceleration value to '0' when the device is installed in the vehicle. This allows accurate analysis of the vehicle's motion with acceleration values. For example, the DAS 20 is set to collect data once every 0.25 seconds, and the acceleration sensor also detects acceleration once every 0.25 seconds.

3. Data collection.

The data output from the ECU of the vehicle is stored in the DAS 20 via the cable 10 connected to the DLC 1 and the DAS 20 communicates with the DLC 1 via the OBD2 communication system Only the 33 items described above are received and stored, and the detected value of the acceleration sensor 30 is stored.

4. Identify the cause of the sudden occurrence.

In the event of a vehicle accident such as a sudden occurrence, the accident recording apparatus 100 is disconnected from the vehicle, and the server is connected to the server through a connection cable. The administrator confirms the data stored in the DAS 20 through a program of the server, And analyzes the seven data stored from the DLC 1 and the data detected through the acceleration sensor 30 so that the state of the vehicle and the operation of the driver at the time of sudden acceleration (the braking pedal and the accelerator pedal) The user is able to confirm the state), so that the exact cause can be identified.

After the data of the DAS 20 is stored in the server, the DAS 20 can be initialized and reused through the reset switch.

1: DLC, 10: Cable
20: DAS, 30: Acceleration sensor

Claims (3)

A cable 10 connected to the DLC 1 of the vehicle;
Braking force detection means for detecting information capable of confirming whether or not the brake pedal is operated;
(The vehicle speed, the engine speed, the accelerator pedal actuation amount, the throttle valve opening amount, the battery voltage, the intake manifold air pressure, and the intake air flow rate) by communicating with the cable and the DLC through the standard OBD2 system, And an external storage for storing an operation state of the brake pedal measured through the braking force sensing means. 2. The accident recording apparatus as claimed in claim 1, The method according to claim 1,
Wherein the braking force sensing means is an acceleration sensor for measuring the acceleration of the vehicle. The accident recording apparatus according to claim 1, further comprising a camera for photographing at least one of a braking pedal and an accelerator pedal.

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