JP2010025790A - Evaluation experiment-use recording apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an evaluation experiment-use recording apparatus improving an evaluation experiment in efficiency by eliminating a routing operation of wiring. <P>SOLUTION: A recorder body 1 which has a signal processing section 22, a RAM 23 and a radio communication section 24, a strain gauge 3, a strain generating section (Invar) 4, and a driving power supply are accommodated in one housing, thereby eliminating the routing operation of wiring. The signal processing section 22 stores respective sampling data sets in the RAM 23 and sends a sampling data set decimated at a prescribed decimation rate to a host computer 31 by using a radio communication, in advance of a timing of sensing an event occurrence, and stores only anteroposterior data sets of the event occurrence, until the RAM 23 is saturated, and then collectively sends all data sets stored in the RAM 23 to the host computer 31 by using the radio communication at the timing of sensing the event occurrence. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an evaluation experiment recording apparatus for recording a result of an evaluation experiment in which a physical quantity is given to an object to be measured (such as an automobile).

  Conventionally, data relating to the driving state of a vehicle is recorded in a volatile memory unit including a stationary state in a time series in a time-sequential interval, and it is possible to analyze a collision occurrence state of the vehicle using the recorded data. 2. Description of the Related Art A vehicle accident occurrence status recording device is known (for example, see Patent Document 1). Here, the degree of impact between the vehicle exterior and the vehicle is detected by a sensor disposed at a predetermined location on the outer periphery of the vehicle body, and this is recorded in a memory unit inserted in a housing equipped in the vehicle body.

When the recording area of the memory unit becomes saturated, the previously recorded data is erased and new data is sequentially recorded. When a collision occurs, a collision occurs immediately before the collision necessary for analyzing the collision. Data for a predetermined time until the time is transferred and stored in a nonvolatile memory unit. Further, when a collision occurs, the lock unit prevents the volatile memory part and the non-volatile memory part from being removed.
JP-A-7-182548

  However, in the automobile accident occurrence state recording apparatus described in Patent Document 1, since the memory unit and the sensor for detecting the degree of impact are configured separately, the wiring between the memory unit and the sensor is installed. Becomes complicated. Therefore, when this recording apparatus is used for an evaluation experiment in which the impact of each part of the automobile is measured by causing the automobile to collide with a wall or the like, for example, for the purpose of technical development related to the safety of the automobile, the recording apparatus is provided in each part of the automobile. The installation work becomes complicated and the efficiency of the evaluation experiment deteriorates.

  Therefore, an object of the present invention is to provide an evaluation experiment recording apparatus that can increase the efficiency of the evaluation experiment by eliminating the wiring.

  In order to solve the above-described problem, an evaluation experiment recording apparatus according to claim 1 is an evaluation experiment recording apparatus that records data obtained by an evaluation experiment that gives a physical quantity to an object to be measured, and depends on the physical quantity. State detection means for detecting the state of the object to be measured, recording means for recording data detected by the state detection means, communication means for performing wireless communication with an external device, and the data to the recording means A recording processing unit for recording, a transmission processing unit for transmitting the data to the external device by the communication unit, and a driving power source are provided, and these are housed in one housing.

  Thus, since the state detection means and the recording means are accommodated in the same housing, wiring between them can be performed inside the housing, and wiring routing can be eliminated. In addition, since it has a function of performing wireless communication with an external device, it is possible to eliminate communication wiring for connecting to the external device. Furthermore, since the drive power supply is built in, it is possible to eliminate the power supply wiring for supplying power from the outside.

  According to a second aspect of the present invention, there is provided an evaluation experiment recording apparatus according to the first aspect of the present invention, wherein an event in which a physical quantity is given to the object to be measured based on data detected by the state detecting means in the housing. Event detecting means for detecting occurrence, and when the recording area of the recording means is saturated, the recording processing means sets the state detecting means to the oldest data recorded in the recording means. Is configured to sequentially overwrite the data detected by the event detection unit, and when the event detection unit detects an event occurrence, the recording area of the recording unit is saturated, and the data before a predetermined time for detecting the event occurrence is the data When the oldest data among the data recorded in the recording means is reached, the recording process to the recording means is terminated.

As a result, when an event occurrence is detected, the data from a predetermined time before the event occurrence can be retained without being overwritten, and the data can be recorded until the recording area of the recording means is saturated. Can be recorded on the recording means.
Furthermore, the recording apparatus for evaluation experiment according to claim 3 is the invention according to claim 2, wherein when the transmission processing unit detects an event occurrence by the event detection unit, the recording process by the recording processing unit is completed. At this time, the data recorded in the recording unit is collectively transmitted to the external device by the communication unit.

Thereby, detailed data before and after the occurrence of the event can be acquired.
According to a fourth aspect of the present invention, there is provided the recording apparatus for evaluation experiment according to the second or third aspect, wherein the transmission processing means is detected by the state detection means when the event detection means does not detect the occurrence of an event. The data is thinned out at a predetermined thinning rate, and is sequentially transmitted to the external device by the communication means.

In this manner, since there is no data fluctuation before the event occurs, the simplified data is obtained by thinning. Thereby, it is possible to suppress an increase in the number of unnecessary data before the event occurs.
Furthermore, the evaluation experiment recording apparatus according to claim 5 is characterized in that, in the invention according to claim 4, the thinning-out rate is set in accordance with a communication speed of the communication means.

Thereby, data can be transmitted to an external device in real time.
The recording apparatus for evaluation experiment according to claim 6 is the invention according to any one of claims 1 to 5, wherein the evaluation experiment is a collision experiment that gives an impact to the automobile as the object to be measured. It is characterized by.
This eliminates communication wiring between the evaluation experiment recording device installed in the vehicle and an external device such as a host computer installed outside the vehicle in the collision test of the vehicle, thereby eliminating wiring. Further, when a collision event occurs, it is possible to acquire detailed data only before and after the collision occurrence recorded in the recording means.

According to the first aspect of the present invention, the state detecting means and the recording means are accommodated in the same housing and wiring between the two is performed inside the housing, and communication wiring and power supply wiring from the outside are eliminated. Since the complicated wiring work is unnecessary, the evaluation experiment can be performed efficiently even when a large number of evaluation experiment recording devices are installed on the object to be measured.
Further, according to the second aspect of the invention, when the event occurrence is detected, only the data before and after the event occurrence can be recorded in the recording means, so unnecessary data relatively before the event occurrence is retained. It can be avoided to remain. As a result, data can be simplified, and the time required for data aggregation after the evaluation experiment can be shortened.

Further, according to the invention of claim 3, detailed data before and after the occurrence of an event can be acquired, so that data analysis can be performed appropriately.
Furthermore, according to the invention according to claim 4, since the simplified data is sent to the external device before the event occurs, the increase in the number of unnecessary data before the event occurs is suppressed. Can do.

Moreover, according to the invention which concerns on Claim 5, the data before event occurrence can be acquired in real time.
Furthermore, according to the invention which concerns on Claim 6, the collision experiment of a motor vehicle can be performed efficiently.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1A and 1B are diagrams schematically showing a collision test recording apparatus 10 according to the present invention, in which FIG. 1A is a front view and FIG. 1B is a perspective view.
The collision test recording apparatus 10 detects and records the impact force applied to the measurement object when an impact is applied to the measurement object. In this embodiment, the collision test recording apparatus 10 is used as an automobile test vehicle. For the purpose of technological development related to ensuring safety, etc., it is used for crash tests in which the impact of each part of the car is measured by making the car collide with a wall or another car, and this is used in the car for the crash test. It shall be installed at the location.

As shown in FIG. 1, the impact test recording apparatus 10 includes a recorder main body 1, a buffer material 2, a strain gauge 3, and a strain generating portion (invar) 4, which are accommodated in a housing 5. It has become an integrated configuration.
The impact test recording apparatus 10 is installed with the strain generator 4 side (the lower side in FIG. 1) facing the location where the stress measurement is desired in order to transmit the stress from the measurement location in the event of a crash. Here, in order to suppress the occurrence of distortion in the strain generation section 4 due to the temperature change at the measurement location, it is preferable to use invar having a small coefficient of thermal expansion for the strain generation section 4.

  At the time of a car collision, stress is applied to the strain generating section 4 at the lower part of the apparatus, and the invar is distorted. It is done. Then, the measurement data read by the strain gauge 3 is recorded by the recorder main body 1. Here, the wiring between the strain gauge 3 and the recorder main body 1 is performed inside the housing 5. Further, the cushioning material 2 plays a role of protecting the recorder main body 1 from an impact at the time of an automobile collision.

Further, the collision test recording apparatus 10 has a built-in drive power supply (not shown) and does not require an external power supply. Furthermore, the collision test recording apparatus 10 can wirelessly communicate with an external host computer and does not require communication wiring for connecting the host computer.
When performing a collision test, it is necessary to synchronize the time axes of the respective devices. Therefore, before the collision test recording apparatus 10 is installed in the vehicle, the inside of the collision test recording apparatus 10 is performed by wireless communication from a host computer. Synchronize the clock.

FIG. 2 is a block diagram showing the configuration of the recorder main body 1 and its peripheral devices.
As shown in FIG. 2, the recorder main body 1 includes an AD conversion unit 21, a signal processing unit 22, a RAM 23, and a wireless communication unit 24.
The analog signal value read by the strain gauge 3 is input to the AD conversion unit 21, converted into a digital signal value by the AD conversion unit 21, and then input to the signal processing unit 22.

  The signal processing unit 22 performs signal processing shown in FIG. 3 to be described later, and performs data writing control to the RAM 23 and control of the wireless communication unit 24. Here, the RAM 23 is a volatile memory. The wireless communication unit 24 performs wireless communication with the wireless communication unit 32 as a wireless communication function of the host computer 31 and performs data transmission using a predetermined wireless communication method such as radio waves.

FIG. 3 is a flowchart showing a signal processing procedure executed by the signal processing unit 22.
This signal processing is executed every predetermined time. First, in step S1, the signal processing unit 22 performs initialization processing. Here, for example, initialization of the RAM 23, a ring buffer point j, which will be described later, a predetermined value x for performing data thinning processing, a collision confirmation threshold, and the like are performed.
Next, the process proceeds to step S2, and the signal processing unit 22 sets an initial value (for example, “0”) of the loop count i, and the process proceeds to step S3.

In step S3, the signal processing unit 22 reads the AD conversion value (digital signal value) output from the AD conversion unit 21, and proceeds to step S4.
In step S4, the signal processing unit 22 compares the AD conversion value read in step S3 with a preset threshold value, and performs a collision check. Here, when the AD conversion value is less than or equal to the threshold value, it is determined that no collision has occurred, and the process proceeds to step S5. When the AD conversion value exceeds the threshold value, it is determined that a collision has occurred and will be described later. The process proceeds to step S9.

In step S5, the signal processing unit 22 writes the AD conversion value read in step S3 in the RAM 23, and proceeds to step S6. At this time, if the storage area of the RAM 23 is saturated, the oldest data stored previously is erased and new data is stored, that is, the oldest data is overwritten with new data.
In step S6, the signal processing unit 22 increments the loop count i and proceeds to step S7.

  In step S7, the signal processing unit 22 determines whether or not the remainder obtained by dividing the loop count i by the predetermined value x is “0”. When i% x = 0, the process proceeds to step S8 to perform wireless communication. The unit 24 is controlled to transmit the AD conversion value read in step S3 to the wireless communication unit 32, and then the process proceeds to step S3. On the other hand, if it is determined in step S7 that i% x ≠ 0, the process proceeds to step S3.

  That is, before confirming the collision, the signal processing unit 22 sequentially records each sampling data in the RAM 23 and also performs wireless communication by thinning out the sampling data at a preset thinning rate of the digital signal value from the AD conversion unit 21. Do. Here, the data thinning rate to be set depends on the communication speed of the wireless communication unit 24 and is set to be the number of data that can be transmitted in real time to the host computer 31 installed outside the vehicle.

In step S9, the signal processing unit 22 sets the final value temp of the ring buffer point j.
In this embodiment, when a collision is confirmed in the step S4, the data recorded in the RAM 23 is retained without overwriting the number of collision confirmations recorded before sampling (predetermined time T) and the recording area of the RAM 23 is saturated. Record data until That is, by recording the data after the collision confirmation until the data before the sampling several times before the collision confirmation becomes the oldest data, only the data before and after the collision is recorded in the RAM 23. Therefore, the final value temp of the ring buffer point j is set to the sampling number for recording the data after the collision confirmation.

Next, the process proceeds to step S10, and the signal processing unit 22 records the AD conversion value in the RAM 23, and proceeds to step S11. At this time, if the storage area of the RAM 23 is saturated, new data is overwritten on the oldest data as in step S5.
In step S11, the signal processing unit 22 increments the ring buffer point j, proceeds to step S12, and determines whether or not the ring buffer point j has reached the final value temp. If j <temp, the process proceeds to step S13, the AD conversion value is read from the AD conversion unit 21, and the process proceeds to step S10.

On the other hand, when it is determined in step S12 that j = temp, the process proceeds to step S14, the wireless communication unit 24 is controlled, and all the data recorded in the RAM 23 is collectively transmitted to the wireless communication unit 32 before the signal is transmitted. The process ends.
Note that the strain gauge 3 and the strain generation unit 4 in FIG. 1 correspond to the state detection unit, the RAM 23 in FIG. 2 corresponds to the recording unit, the wireless communication unit 24 corresponds to the communication unit, and the host computer 31 and the wireless communication unit. Reference numeral 32 corresponds to an external device. 3 corresponds to the event detection means, steps S5 and S10 correspond to the recording processing means, and steps S7, S8, S12 and S14 correspond to the transmission processing means.

Next, operations and effects in the present embodiment will be described.
FIG. 4 is a diagram showing a configuration of an automobile collision test system.
Now, as shown in FIG. 4, it is assumed that a collision experiment is performed in which the automobile 110 is caused to travel at a predetermined vehicle speed and collide with a wall 120 disposed in front of the vehicle. In this case, the collision test recording apparatus 10 is installed at a location where stress measurement is desired, such as the outer periphery of the vehicle body or the driver's seat, and the host computer 31 is installed outside the vehicle.

A display device (display) 130 is connected to the host computer 31 so that experimental result data can be displayed.
The impact test recording apparatus 10 has a structure in which the recorder main body 1 and a strain gauge 3 and an invar 4 as strain sensors are accommodated in a housing 5, and wiring between the two is provided inside the housing 5. Has been done. Therefore, there is no need to route wiring that connects the recorder main body 1 and the strain sensor.

Further, since the collision test recording apparatus 10 has a built-in drive power supply, no external power supply wiring is required. Furthermore, since the collision test recording apparatus 10 can perform wireless communication with the host computer 31, no communication wiring for connecting the host computer 31 is required.
As described above, the collision test recording apparatus 10 according to the present embodiment has a configuration in which the wiring is not routed. Therefore, the collision test recording apparatus 10 can be used as an object to be measured (here, the installation of various wirings is not complicated). It can be installed in each part of an automobile, and an evaluation experiment can be performed efficiently.

  When the collision experiment is started, an analog signal value repeatedly measured at a constant interval in the strain gauge 3 is input to the AD conversion unit 21 of the recorder main body 1 and converted into a digital signal value. At this time, if it is immediately after the start of the experiment and no collision has occurred, the AD conversion value output from the AD conversion unit 21 is equal to or lower than the threshold for collision confirmation. It determines with No by step S4 of FIG. 3, and transfers to step S5.

  In step S5, data is written to the RAM 23. In step S6, the loop count i is incremented. In step S7, data thinning is determined. In this step S7, it is determined whether or not the remainder obtained by dividing the loop count i by the predetermined value x is “0”. When i% x = 0, the process proceeds to step S8, and the host computer 31 is wirelessly transmitted. Data transmission is performed by communication. That is, before the collision occurs, data transmission is performed once every x times. The processing from step S5 to step S8 is repeated until a collision occurs and the AD conversion value exceeds the threshold value.

At this time, if the recording area of the RAM 23 is saturated before the collision occurs, the oldest data recorded in the RAM 23 is overwritten with the newest AD conversion value, thereby erasing the previously recorded data. New data will be recorded sequentially.
Thus, before the occurrence of the collision, each sampling data is recorded in the RAM 23, and the sampling data thinned out at a predetermined thinning rate is transmitted to the host computer 31 by wireless communication.

Thereafter, when the automobile collides with the wall, a stress is applied to the invar 4 of the collision test recording apparatus 10 and the invar 4 is distorted, and this distortion is read by the strain gauge 3. At this time, since the AD conversion value of the analog signal value measured by the strain gauge 3 is a value exceeding the threshold value, the signal processing unit 22 determines Yes in step S4 of FIG. 3 and proceeds to step S9.
In step S9, the final value temp of the ring buffer point is set, and the process proceeds to step S10 to write data in the RAM 23. Next, the process proceeds to step S11, and the ring buffer point j is incremented. Then, in step S12, it is determined whether or not the ring buffer point j has reached the final value temp, and data writing to the RAM 23 is repeated until j = temp. .

  That is, when j <temp, it is determined that data older than the predetermined time T before the occurrence of the collision exists in the RAM 23, and the new AD conversion value is overwritten on the oldest data, and is older than the predetermined time T before the occurrence of the collision. Erase the data. When j = temp, the data before a predetermined time T before the occurrence of the collision is the oldest data in the RAM 23, in other words, only the data before and after the collision is held in the RAM 23. Judgment is made, and data writing to the RAM 23 is completed.

  When j = temp, the signal processing unit 22 determines Yes in step S12, proceeds to step S14, transmits all data in the RAM 23 to the host computer 31 by wireless communication, and ends the signal processing. The data transmitted at this time is not thinned data before the occurrence of a collision, but is detailed data sequentially recorded at each sampling. Therefore, after the experiment is completed, an appropriate analysis can be performed using the detailed data transmitted in a batch.

  Thus, in the above embodiment, since the recorder main body and the strain sensor are accommodated in the same housing, wiring between them can be performed inside the housing, and wiring routing can be eliminated. In addition, since it has a function of performing wireless communication with an external device, communication wiring for connecting to the external device can be eliminated, and since a drive power supply is built in, a power supply wiring for supplying power from outside is provided. It can be lost. As a result, the evaluation experiment is efficient because it does not involve complicated wiring work.

  In addition, when the recording area of the RAM is saturated before the collision occurs, the oldest data recorded in the RAM is sequentially overwritten with new AD conversion values, and when a collision is detected, a predetermined time before the collision occurs. Since the data is recorded without being overwritten and the data is recorded until the recording area of the RAM is saturated, only the data before and after the occurrence of the collision can be reliably recorded. Therefore, it is possible to avoid holding unnecessary data relatively before the occurrence of the collision, and it is possible to simplify the data and reduce the time required for data aggregation after the evaluation experiment.

Further, after the collision occurs, detailed data before and after the occurrence of the collision are collectively transmitted to the host computer, so that the data analysis after the experiment can be appropriately performed.
Further, before the occurrence of the collision, the simplified data is thinned out before the occurrence of the event and the simplified data is transmitted to the host computer, so that it is possible to suppress an increase in the number of unnecessary data before the occurrence of the event.

Furthermore, since the thinning rate when thinning data is set according to the communication speed in wireless communication, the data can be transmitted to the host computer in real time.
In the above embodiment, the case where the present invention is applied to a collision test of an automobile has been described. However, the present invention is applied to an evaluation experiment that gives an impact to an object to be measured other than an automobile, such as a drop test of a personal computer. You can also. Further, the present invention can be applied to an evaluation experiment in which a temperature change or the like is given to the object to be measured, in addition to an evaluation experiment in which the object to be measured is given an impact.

1 is an external view of a recording apparatus for a collision test according to the present invention. It is a block diagram which shows the structure of a recorder main body and its peripheral device. It is a flowchart which shows the signal processing procedure performed in a signal processing part. It is a figure which shows the structure of the collision test system of a motor vehicle.

Explanation of symbols

1 Recorder body 2 Buffer material 3 Strain gauge 4 Strain generation part (Invar)
5 Housing 10 Collision Test Recording Device 21 AD Converter 22 Signal Processor 23 RAM
24 wireless communication unit 31 host computer 32 wireless communication unit 110 automobile 120 wall 130 display device (display)

Claims (6)

A recording apparatus for evaluation experiment for recording data obtained by an evaluation experiment for giving a physical quantity to a measured object,
State detecting means for detecting the state of the object to be measured depending on the physical quantity, recording means for recording data detected by the state detecting means, communication means for performing wireless communication with an external device, and the data Recording processing means for recording data to the recording means, transmission processing means for transmitting the data to the external device by the communication means, and a drive power source, which are housed in one housing. Recording device for evaluation experiment. In the housing, there is further provided event detection means for detecting occurrence of an event in which a physical quantity is given to the object to be measured based on data detected by the state detection means,
The recording processing unit is configured to sequentially overwrite the data detected by the state detecting unit over the oldest data recorded in the recording unit when the recording area of the recording unit is saturated. When the event detection means detects an event occurrence, the recording area of the recording means is saturated, and the data before a predetermined time for detecting the event occurrence is the oldest data recorded in the recording means The recording apparatus for evaluation experiment according to claim 1, wherein the recording process to the recording unit is terminated when it becomes.   The transmission processing means collects the data recorded in the recording means to the external device by the communication means when the recording processing by the recording processing means is completed when the event detection means detects the occurrence of an event. The evaluation experiment recording apparatus according to claim 2, wherein the evaluation experiment recording apparatus is transmitted.   The transmission processing unit thins out the data detected by the state detection unit at a predetermined thinning rate when the event detection unit does not detect the occurrence of an event, and sequentially transmits the data to the external device by the communication unit. The recording apparatus for evaluation experiment according to claim 2 or 3.   5. The evaluation experiment recording apparatus according to claim 4, wherein the thinning rate is set according to a communication speed of the communication unit.   The evaluation experiment recording apparatus according to claim 1, wherein the evaluation experiment is a collision experiment in which an impact is applied to an automobile as the object to be measured.

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