KR19980027279A - Small 3-axis acceleration auto recorder and control method - Google Patents

Abstract

The present invention relates to a compact three-axis acceleration automatic recording device and a method thereof, and detects three-way acceleration (X, Y, Z direction) every predetermined time when a driving car crashes, and outputs a corresponding electrical signal. A control unit and a control unit which reads the signal applied by the detection unit at a predetermined time, calculates the data read by the set arithmetic equation for calculating the acceleration, and outputs a control signal corresponding thereto; It consists of a data storage unit for storing the calculated data according to the control signal, using three single-axis acceleration sensor, it is possible to accurately determine the three-way acceleration according to the driving state of the vehicle, using a separate memory device Reusable, anyone can easily analyze data by serial communication with personal computer, In order to make it easy to install, it is miniaturized and, above all, it is inexpensive, so it can be easily installed on existing vehicles.

Description

Small 3-axis acceleration auto recorder and control method

1 is a block diagram of a small three-axis acceleration automatic recording device according to an embodiment of the present invention,

2 is a flowchart of a small three-axis acceleration automatic recording control method according to an embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

10: detection unit 11: acceleration (X direction) detection unit 12: acceleration (Y direction) detection unit

13: Acceleration (Z direction) sensing unit 20: Filter unit 30: Control unit

40: data storage 41: ROM 42: RAM

50: time output unit 60: lamp display unit

61: Circuit normal operation display lamp 62: Data recording display lamp

63; No storage area in RAM Indication lamp 70: Data communication unit

The present invention relates to a small three-axis acceleration automatic recording device and a control method thereof, and more specifically, to measure the acceleration of various moving objects such as cars and ships, or to study and experiment with airbag development of automobiles. A small three-axis acceleration automatic recording device for recording a driving distance, a speed, an acceleration, and the like indicating a state of a vehicle at the time of an accident and a control method thereof.

Conventionally, an apparatus for recording acceleration using a single-axis acceleration sensor has been developed and used.

However, the conventional acceleration recording apparatus described above has a problem that data is limited to one dimension by using a single axis sensor.

In addition, in order to analyze the data recorded in the apparatus, since the data must be analyzed using a specific equipment, a particular equipment must be purchased separately, which increases the additional cost.

In addition, the pre-developed products are weak to external shocks, and cannot be used in a large number, and can only be used once, and after retrieving the recorded contents, the apparatus cannot be recycled.

Accordingly, an object of the present invention is to solve the above-mentioned problems, and by using three acceleration sensors, by recording three-way acceleration according to the driving state of the vehicle, it is possible to accurately determine the driving state of the vehicle, and The present invention provides a compact three-axis acceleration automatic recording device and a method thereof, which can be reused using a memory device of the present invention, and anyone can easily analyze data according to serial communication with a personal computer.

The small three-axis acceleration automatic recording device according to the present invention is inexpensive and can be easily mounted and used in a running vehicle.

As a means for achieving the above object, the configuration of the present invention, the sensing unit for detecting the three-way acceleration according to the driving state of the vehicle at a predetermined time and outputs a corresponding electrical; When the signal applied by the sensing unit is read every predetermined time, and if the average value of the acceleration read for a predetermined time is equal to or greater than the set value, and the value is maintained for the set time, it is determined that a vehicle collision has occurred, and a control signal for storing data A control unit for outputting a; In accordance with the control signal output from the controller, it comprises a data storage for storing the data to be read.

As a means for achieving the above object, another configuration of the present invention comprises the steps of: reading the three-way acceleration according to the driving state of the vehicle at regular intervals; Accumulating the read acceleration data for a set time and calculating an average value; Checking whether the external power is supplied; Comparing the calculated acceleration average value with the set acceleration when the external power is supplied; If the average value of the acceleration is greater than the set acceleration value, and maintains the value for more than a set time, the step of storing the data read in the RAM at regular intervals in a certain set time range.

By the above configuration, the most preferred embodiment that can be easily carried out by those skilled in the art with reference to the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a small three-axis acceleration automatic recording apparatus according to an embodiment of the present invention, Figure 2 is a flow chart of a small three-axis acceleration automatic recording control method according to an embodiment of the present invention.

As shown in FIG. 1, the configuration of the compact three-axis acceleration automatic recording device according to the embodiment of the present invention is that if a car crashed while driving, acceleration (X direction), acceleration (Y direction), acceleration (Z direction) Sensing unit 10 for detecting a predetermined time and outputting an electrical signal corresponding thereto; A filter unit 20 connected to an output terminal of the sensing unit 10 to remove noise and unnecessary frequency ranges of an analog signal to be applied; A control unit 30 connected to an output terminal of the filter unit 20 to read an applied signal, calculate the read data according to a set arithmetic expression, and output a control signal corresponding thereto; A data storage unit 40 connected to an output terminal of the control unit 30 and storing the calculated data according to a control signal; A time output unit 50 for outputting a current date and time to the control unit 30; A lamp display unit 60 for displaying a normal operation state of the circuit, a data storage completion state, and a storage space state of the data storage unit; The data communication unit 70 performs data communication according to an external communication request signal.

The sensing unit 10 may include an acceleration (X direction) detector 11, an acceleration (Y direction) detector 12, and an acceleration (Z direction) for measuring acceleration of a vehicle and outputting a corresponding analog signal. It consists of a sensing unit (11).

The data storage section 40 includes: a ROM (ROM) 41 in which an execution program of the control section 30 is embedded; RAM 42 stores and outputs data in accordance with a control signal of the controller 30.

The lamp display unit 60 includes: a circuit normal operation display lamp 61 for displaying whether the circuit is in a normal operating state; A data storage completion indication lamp 62 indicating completion of data storage; In the RAM for confirming the storage space of the RAM 52, there is no storage area display lamp 63.

The automatic acceleration recording method according to an embodiment of the onset includes the steps of: initializing all the variables used when the power is applied, and checking the operation state of the circuit (S100, S110, S120); Reading the acceleration (X direction), the acceleration (Y direction), and the acceleration (Z direction) according to a vehicle driving state at regular intervals (S140); Accumulating the acceleration (X direction) value read in the step S140 for a predetermined time period (S160); Calculating an average value of the acceleration (X direction) accumulated in the step (S160) (S170); Checking whether an external power supply is performed (S180); Comparing the average value of the acceleration X calculated in the step S170 with the set acceleration when the external power is supplied (S190); Determining whether the average value of the calculated acceleration (X direction) is maintained for a predetermined time or more when the average value of the acceleration (X direction) calculated in the comparing step (S190) is greater than or equal to a set value (S200); When the average value of the accelerations (X directions) calculated in the step S200 is maintained for a set time, the RAM 42 of the data storage unit 40 reads in the step S140 at predetermined intervals in the set time range. Storing the data of the accelerated acceleration (X direction), the acceleration (Y direction), and the acceleration (Z direction), and blinking the data storage completion indication lamp 62 of the lamp display unit once (S210, S220); Confirming an external data communication request signal (S230); If there is an external data communication request in step S230, the data stored in the RAM 42 of the data storage unit 40 is transmitted to the outside, and the data storage unit 40 according to a signal applied from the external communication device. Resetting and returning the RAM 42 (S240, S250, S260); Flashing and returning a circuit abnormality occurrence lamp 61 of the lamp display unit 60 when the circuit fails to perform a normal operation in step S130; Supplying and returning the internal power until the external power is input to the RAM 42 of the data storage unit 40 when the external power is not supplied in the step S180 (S181, S182); When the average value of the acceleration (X direction) calculated in the step S190 is equal to or less than the set value, or when the average value cannot be maintained for the set time in the step S200, the value of the acceleration (X direction) is corrected according to the correction value. And returning (S191); If there is no external data communication request signal in step S230, determining whether the RAM 42 of the data storage unit 40 is in a data full state (S231); When the RAM 42 of the data storage unit 40 is in the data full state in step S231, the RAM 42 of the lamp display unit 60 turns on and returns the no storage area indication lamp 63. have.

The operation of the compact three-axis acceleration automatic recording device according to the embodiment of the present invention by the above configuration is as follows.

When the driver applies power for driving the vehicle, the controller 30 initializes all the variables used and checks the operation state of the circuit (S100, S110, S120).

If an abnormality occurs in the operation of the configuration circuit, the circuit abnormality occurrence lamp 61 of the lamp display unit 60 blinks (S131) to inform the driver whether an abnormality has occurred.

When the component circuit operates normally and the vehicle is driven, the detector 10 detects acceleration (X direction), acceleration (Y direction), and acceleration (Z direction) according to the driving state of the vehicle and controls each corresponding signal. Output to (30).

The acceleration detector 11 detects three-way acceleration generated when the vehicle is in a driving state and outputs analog signals corresponding thereto.

The filter unit 20 is a low pass filter, and removes noise and unnecessary frequency regions mixed in the analog signal output from the detector 10 and outputs it to the controller 30.

According to the signal output from the sensing unit 10, the control unit 30 operates as shown in FIG.

The controller 30 reads the acceleration (X direction), the acceleration (Y direction), and the acceleration (Z direction) output from the filter unit 20 in 1 msec periods (S140).

The value of the acceleration (X direction) among the read data is accumulated for 256 msec, which is an arbitrary setting time (S160), and the accumulated data acceleration (X direction) is calculated by a set arithmetic formula to calculate an average value (S170).

After calculating the average value of the acceleration in the above, it is confirmed whether the external power supplied from the vehicle power supply (S180), when the external power is supplied, the average value of the acceleration (X direction) calculated above and the set acceleration value 1.7G Is compared (S190).

If the average value of the acceleration (X direction) is greater than the set value of 1.7G, it is determined whether the average value of the acceleration (X direction) is maintained for 5 msec or more, which is the set time (S200). .

If the average value of the acceleration (X direction) is larger than the set value 1.7G and the value is maintained for the set time, it is determined that a vehicle collision will occur, and the data acceleration (X direction) and acceleration (Y direction) read above are determined. ), The acceleration (Z direction) data is stored in the RAM 42 of the data storage unit 40 at a predetermined period of 1 msec within the setting range of 150 msec before the collision to 150 msec after the collision (S210), and the lamp display unit 60 The data storage completion display lamp 62 blinks once to indicate that the data storage operation has been performed (S220).

In addition, the controller 30 determines whether the data communication unit 70 has a data communication request signal from an external communication device (S230).

When the data communication request signal is input from the outside, the data stored in the RAM 42 of the data storage unit 40 is transmitted to the external communication device according to the RS-232C communication protocol (S240), and the external communication device The signal corresponding to the communication completion is transmitted from the RAM 42 to reset and return to the initial state (S250).

However, if there is no data communication request from the outside, it is determined whether there is a data storage space in the RAM 42 of the data storage unit 40 (S231). If the data is full, the RAM of the lamp display unit 60 does not have a storage area. The display lamp 63 lights up and returns to the beginning of the program (S232).

However, when the external power is not supplied due to the collision of the vehicle in the step of determining whether the external power is supplied (S180), the controller 30 supplies the rechargeable battery power internally supplied to the RAM 42. After the loss of the stored data is prevented (S181), the external power is re-checked and returned when the external power is supplied (S182).

In addition, when the acceleration average value is smaller than the predetermined setting value or does not maintain the predetermined setting time in (S190, S200), it is determined that the temporary sudden stop or abnormal road driving phenomenon, not the collision of the vehicle, accumulated in the (S160) The average value of the acceleration (X direction) is corrected to 0G (S191).

As described above, in the embodiment of the present invention, by accurately recording the three-way acceleration using the sensor in three axes, it is possible to accurately determine the driving state of the vehicle, it is possible to reuse after use once using the memory device.

In addition, since the data stored in the memory can be analyzed by serial communication using a personal computer instead of a specific device, anyone can easily analyze the data. It is possible to provide a small three-axis acceleration automatic recording device having the effect that can be easily mounted on a vehicle running in the and the method.

This effect of the present invention can be used in all fields such as transportation machinery, shelves, aircraft.

In particular, it is an essential equipment when developing airbags for automobiles.

Claims (16)

Sensing means for detecting a three-way acceleration according to a driving state of a vehicle at a predetermined time and outputting a corresponding electrical signal; When the signal applied by the sensing means is read every predetermined time, and if the average value of the acceleration read for a predetermined time is equal to or greater than the set value, and the value is maintained for the set time, it is determined that a vehicle collision has occurred, and a control signal for storing data Control means for outputting; And a data storage means for storing the data to be read in accordance with the control signal output from the control means. The method of claim 1, wherein the sensing means, Small three-axis acceleration automatic recording device, characterized in that for measuring the acceleration of the vehicle in the three directions of the X-axis, Y-axis, Z-axis and outputs a corresponding analog signal. The method according to claim 1 and 2, And a filter means for removing noise of the signal output from the acceleration sensing means. The method of claim 1, And a lamp display means for displaying the operation state of the circuit, the completion state of data storage, and the state of data storage space. The method of claim 4, wherein the lamp display means, Circuit normal operation display means for displaying whether the circuit is in a normal operating state; Data storage completion display means for indicating completion of data storage; And a storage arealess display means in the RAM for checking the storage space of the RAM. The method of claim 1, A small three-axis acceleration automatic recording device further comprising data communication means for performing data communication in accordance with an external data communication request signal. The method of claim 1, wherein the control means, By reading the signal of the sensing means applied for a predetermined time period, the average value of the acceleration accumulated during the set time is calculated by a set arithmetic formula, and then the calculated average value is compared with the arbitrarily set acceleration, and the calculated average value of acceleration When the value is greater than the arbitrarily set acceleration, or the value is maintained for more than a predetermined set time, it is determined that the driving car has collided, and the above-mentioned data is stored every predetermined time for a predetermined time. Axial acceleration auto recorder. The method of claim 1, wherein the data storage means, A ROM containing an execution program of the control means; And a RAM for storing and outputting data in accordance with a control signal of the control means. The method of claim 1, And a time output means for outputting the current correct time to the control means. Reading the three-way acceleration according to the driving state of the vehicle every cycle for a predetermined time; Accumulating the read acceleration data for a set time and calculating an average value; Checking whether the external power is supplied; Comparing the acceleration average value calculated when the external power is supplied with the set acceleration; If the average value of the acceleration calculated above is greater than the set acceleration value, and maintains the value for more than the set time, the small three-axis acceleration comprising the step of storing the data read in the step in the RAM at regular intervals in a certain set time range Auto recording method. The method of claim 10, And flashing the data storage indication lamp to indicate the completion state of the data storage operation when the data storage is completed. The method of claim 10, Determining whether a data communication signal is applied from the outside; And transmitting a data stored in the RAM to an external device when the data communication signal is applied, and resetting the RAM. The method of claim 12, If the data communication signal is not applied from the outside, comparing the data storage state with the RAM storage space; And turning on the display of no storage area in the RAM when the RAM storage space is in the full state, thereby displaying a data storage state. The method of claim 10, Determining an operating state of a circuit when power is applied; And flashing and returning a circuit fault lamp if the circuit does not operate normally in the step. The method of claim 10, Comparing external power; Supplying internal power to the RAM if external power is not supplied in the step; And comparing the external power supply again to return if the external power is supplied. The method of claim 10, And correcting the acceleration average value to 0G when the acceleration average value is smaller than the set acceleration value or cannot be maintained for more than a predetermined set time.