JP2500714Y2 - Recording device for digital operation data - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a digital operation data recording apparatus for recording on a recording medium digital operation data indicating an operation state of a vehicle such as vehicle speed and mileage.

[Conventional technology]

2. Description of the Related Art Conventionally, this type of digital operation data recording device is used by being installed in a vehicle for compressing digital operation data indicating an operation state of the vehicle based on a predetermined set value and recording the compressed data on a recording medium. The recording medium is composed of an IC memory card or the like that is detachably attached to the recording device, and the digital operation data recorded on the recording medium is installed in an office that manages the operation of the vehicle, read by an analysis device, and expanded here. It is processed and then analyzed. More specifically, the recording device samples and inputs an electric signal having a cycle corresponding to the rotation of the axle generated by the rotation sensor connected to the transmission of the vehicle by the connecting means,
A micro that performs speed calculation by calculation and also performs data compression processing to shorten the data length when recording the speed calculated by this calculation as digital data on a recording medium such as an IC memory card that is removably mounted. It consists of a computer (CPU).

If a certain time or time is set in the digital operation data recording device described above, the driver is urged to stop the operation and take a break when the time elapses or when the time comes. There are some that are designed to give an alarm.

[Problems to be solved by the device]

In the above-mentioned conventional device, after traveling for 1 to 2 hours,
In order to prevent drowsy driving and overworked driving, you can only take precautions by stopping driving and taking a break, but in reality, the time is unique due to age, driving history, physical condition, etc. However, there was a problem that reliable management and guidance could not be practically provided.

Therefore, in view of the above-mentioned conventional problems, it is an object of the present invention to provide a recording device of digital operation data capable of surely issuing an alarm for drowsy driving.

[Means for solving the problem]

As shown in the basic configuration diagram of FIG. 1, the digital operation data recording device according to the present invention for solving the above problems is installed in a vehicle and compresses the digital operation data indicating the operation state of the vehicle 12c. _In a recording device for digital operation data, which is compressed by ₁ and records the compressed digital operation data in a recording medium 2 which is detachably mounted, a traveling pattern for a predetermined time that represents a change in traveling speed during a dozing drive. Pattern storage means 12d _{1 in} which the digital data of the above is stored in advance, and the latest digital operation data are sequentially stored, and operation data storage means for holding the digital operation data for a predetermined time before the latest digital operation data and 12d _2, each time the latest digital operational data are stored in該運row data storage unit 12d _2, stored in the operation data storage unit 12d ₂ In which the digital operational data and comparing means 12c ₂ for comparing the digital data stored in said pattern storage means 12d _1, alarm when the both data are identical or similar by the comparing means 12c ₂ is detected And an alarm means 12i for emitting the alarm.

In order to solve the above-mentioned problems, the recording device of the digital operation data made by the present invention also includes the alarm means 12i.
However, it is characterized by continuing to issue an alarm until the vehicle stops.

[Action]

In the configuration of FIG. 1 described above, the pattern storage means 12d ₁ stores in advance digital data of a traveling pattern for a predetermined time, which represents a change in traveling speed during drowsy driving, and the operation data storage means 12d ₂ includes The latest digital operation data for a predetermined time stored in sequence is held, and the comparison means 12c ₂ stores the latest digital data in the operation data storage means 12d ₂ every time the operation data storage means 12d is stored. Digital operation data and pattern storage means stored in ₂
Compare the digital data stored in 12d ₁ . Then, when it is detected by the comparison means 12c ₂ that the two data are the same or similar, the warning means 12i gives a warning, so that the driver knows by this warning that he was in a dozing driving state, You can determine that you must take a proper break.

Further, when the warning means 12i gives a warning, the warning does not stop until the vehicle stops, so that the driver can be surely allowed to take a break.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 shows an embodiment of a digital operation data recording apparatus according to the present invention. In the figure, the recording device is a rotation sensor 11 connected to a transmission of a vehicle by a connecting means (not shown), and an electric signal from the rotation sensor 11 is sampled and input, and a speed is calculated by the calculation. When the speed is recorded as digital data on the IC memory card 2 as a recording medium, the device main body 12 performs a process such as compression processing of the data, and by mounting the IC memory card 2 on the device main body 12, Various data of the card recorded in the IC memory card 2 are read from the IC memory card 2, and the compressed data is written in the IC memory card 2.

As shown in FIG. 3, the IC memory card 2 has a built-in memory 2a in which one word has 8 bits (1 byte),
Common data recording area 2a _{1 for} recording common data
And ID data recording area 2a _{2 for} recording ID data
And a digital operation data recording area 2a ₃ for recording digital operation data.

The common data recording area 2a ₁ is an area 2a _{11 to} 2a ₁₃ for recording the tolerance, resolution and sampling time.
Have. The above-mentioned tolerance indicates an error range allowed at the time of recording, the resolution and the sampling time are related to the accuracy of the collected speed data, and the accuracy of the data obtained by the compression processing is the tolerance of the speed compression, Depending on the resolution and sampling time, these data are indispensable for decompressing and analyzing on the analysis side.

The ID data area 2a _2, and the latest address of the digital operational data recording area 2a ₃ which records the digital operational data rate compressed by and separated for each operating predetermined compression method is recorded. Digital operation data recording area 2a ₃
In addition to the digital operation data of the speed which is divided by each operation and compressed by a predetermined compression method, the start time and the end time are sequentially recorded at the start and end of each operation. This time information is digitally analyzed. It is important for allocating operation data during this time and knowing the speed at each time. 1 operation is IC, for example
It is defined as the period from when the memory card is attached to the recording device 1 to when it is removed.

As shown in FIG. 2, the device main body 12 of the recording device is
It is composed of a pulse counter 12b, a CPU 12C, an internal memory 12d including a ROM and a RAM, a battery 12e, a display 12f, an input / output interface 12g, a clock 12h for generating real-time date / time minutes / seconds data, and an alarm sound generator 12i. ,
The IC memory card 2 is detachably connected to the input / output interface 12g composed of the IC memory card connector.

In the ROM in the internal memory 12d, in addition to the control program,
The digital data of the driving pattern for a predetermined time, which represents the change of the driving speed during drowsy driving, is stored in advance in the RAM.
Stores a tolerance, resolution, and sampling time, and is provided with a storage area for storing digital operation data before compression processing for a predetermined time.

When the vehicle equipped with the device main body 12 configured as described above travels, the rotation sensor 11 generates a pulse signal and supplies the signal to the pulse counter 12b in the device main body 12.
The pulse counter 12b is a device that counts the number of input pulses, and is configured to re-count from zero when the count value reaches the upper limit. The CPU 12c is a control device that controls all the functions of the main body 12 and is controlled by a control program stored in the ROM in the internal memory 12d.
The sampling time and the set value of the tolerance stored in the RAM are monitored, and the cycle of the sampling timing signal is determined based on the set value of the sampling time.

The CPU 12c reads the value of the pulse counter 12b in accordance with the sampling timing signal, finds the number of input pulses during the sampling period by the difference from the previous value stored in the RAM in the internal memory 12d, and finds the speed by calculation. If this data is the first data at the start operation, CPU 12c causes the recorded digital operational data recording area 2a ₃ of the recording medium 2 by outputting the time information via the input-output interface 12g.

Further, the CPU 12c compares the digital operation data for a predetermined time stored in the RAM of the internal memory 12d with the digital data of the traveling pattern stored in the ROM in advance, and when both are coincident or similar, an alarm sound is generated. It also controls the device 12i to start issuing an alarm and continue issuing this alarm until the vehicle stops.

By the way, the compression process of the digital operation data regarding the speed is performed based on the following concept. That is, when an allowable error range (tolerance) for each sampling speed value is set in advance and a straight line that crosses the allowable difference is considered, the straight line represents vehicle speed information within the allowable difference. If the length of the straight line is represented by the number of samples and recorded and the value of the end point of the straight line is also recorded, the vehicle speed during the period covered by the straight line can be regularly managed. Thus, if the vehicle speed is stored only by the length of the straight line and the final data, a large amount of information can be recorded with a small amount of data, and data compression can be realized.

FIG. 4 shows the vehicle speed V ₀ at the time of sampling from t ₀ to t ₁₁ .
~ V ₁₁ shows the relationship, the dotted line is the vehicle speed error range. At each sampling time, it is checked whether or not there is a straight line that crosses the error range of the data before that time. t ₀ ~ t ₉
The line exists up to, but it does not exist at t ₁₀ . At this time, of the straight lines that include the starting point V ₀ and cross the error range, a straight line L ₂ that passes the upper limit and a straight line L ₁ that passes the lower limit are drawn, and the straight lines L ₁ and L ₂ of the tolerance of the final sampling data V ₉ are drawn.
The midpoint V in the range sandwiched by is the end point data, and the length is "9". The end point becomes the start point of the next straight line, and so on, and so on. The compression speed data recorded in the IC memory card 2 by the above compression processing is recorded in the number of samples and the speed.

IC with digital operation data recorded by recording device
The memory card 2 is attached to an analysis device (not shown) in order to analyze the digital operation data therein.

The outline of the operation of the recording apparatus has been described above, and the details thereof will be described below with reference to the flowcharts of FIGS. 5 and 6, respectively.

FIG. 5 is a flow chart showing the work executed by the CPU 12c of the recording apparatus according to the control program. The CPU 12c starts its operation when its power is turned on, and its first step
Initialize in S1 and set the initial flag to "0"
That is, clear. Next, the process proceeds to step S2, where it is determined whether or not the ignition (IGN) switch is turned on by a signal from an IGN on detection circuit (not shown). And again in step S2
It is determined whether or not the IGN switch is turned on, and steps S2 and S3 are repeatedly executed until this determination becomes YES. When the determination in step S2 is YES, the process proceeds to step S5. In step S5, it is determined whether or not the IC memory card 2 is recordable, based on the information for determining whether or not the IC memory card 2 is attached and is in a recordable state.

If the determination in step S5 is YES, the process proceeds to step S6, where it is determined whether the initial flag is 1. Advance determination of the step S6 to step S7 when NO, the storage where tolerances from the common data area 2a ₁ of the IC memory card 2, resolution, reading sampling time, the read data in the RAM of the internal memory 12d To do. Then, the process proceeds to step S9, where the initial flag is set, and then the process proceeds to step S10.

In step S10, it is determined whether or not the time for the sampling time has elapsed. If the determination is NO, the process returns to step S2, and if the determination is YES, the step S10 is performed.
Proceed to 11. In step S11, the pulse counter 12b
Is read to perform speed calculation, and the digital operation data relating to the speed obtained by the calculation is compressed and recorded in the IC memory card 2. Then proceed to step S12,
Here, in detail, after performing a drowsiness warning process, which will be described later, the process returns to step S2 to repeat the above steps.

When the initial flag is set in step S9 as described above, the determination in step S6 is YES and step S6
After execution of step S9, steps S7 to S9 are skipped and the process proceeds to step S10.

Also, when the determination in step S5 is NO,
That is, when the IC memory card 2 is not mounted in a recordable state, the process proceeds to step S13, where it is determined whether the initial flag is set. When the determination in step S13 is NO, the process returns to step S2, and when the determination is YES, the process proceeds to step S15 to clear the initial flag and then the process returns to step S2.

In the doze warning process of step S12, the sixth
Its first step as shown in the figure flow chart
In S12d, the digital operation data regarding the speed calculated in step S11 is written in a predetermined area of the RAM of the internal memory 12a. Then proceed to step S12b, where RAM
It is determined whether or not the digital operation data written in is for a predetermined time. If the determination in step S12b is NO, the process returns to step S2 in the flowchart of FIG. 5, and if the determination is YES, the process proceeds to step S12c. .

In step S12c, the digital operation data for a predetermined time stored in the RAM and the digital data of the travel pattern recorded in the ROM in advance are compared to determine whether or not they match or are similar. When the determination in step S12c is NO, the process proceeds to step S12d, where the digital operation data in the RAM is moved by one, and then the process returns to step S2 in the flowchart of FIG. When the determination in step S12c is YES, that is, when the two are the same or similar, the process proceeds to step S12e, where the alarm sound generator 12i is generated.
To activate the alarm.

After that, the process proceeds to step S12f, where it is determined whether or not the vehicle has stopped depending on whether or not the speed becomes 0 km / h,
When the determination is NO, the process returns to step S2 in the flowchart of FIG. 5, and thereafter the alarm is continuously issued until the determination in step S12f is YES. The determination in step S12f is YE
If S, proceed to step S12g, where the alarm sound generator 12i
Stop the operation and terminate the alarm. After that, the process proceeds to step S12h, where the digital operation data relating to the speed for the predetermined time stored in the predetermined area of the RAM is cleared, and then the process returns to step S2 in the flowchart of FIG.

The determination in step S12c is made by using the digital operation data a ', b', c ', ... Regarding the speed for a predetermined time, for example, one minute, stored in the RAM as shown in FIG. The difference from the digital data a, b, c, ... Of one minute's running pattern prerecorded in the ROM as shown in (a), that is, a'-a = a "≤Δε _a , b'- b = b ″ ≦ Δε _b ,
c′−c = c ″ ≦ Δε _c , ..., And when all of the differences a ″, b ″, c ″, ... Are less than or equal to a predetermined value, both digital data match or are similar. If not, it is judged that they are not the same or similar.

Incidentally, the digital operation data a ′, b ′, c ′, ...
After the above determination, one digital data is moved to form a storage location for writing the next digital data.

〔effect〕

As described above, according to the present invention, a driving pattern stored in advance in the case of drowsy driving is compared with an actual driving pattern, and an alarm is issued when the actual driving pattern matches or is similar to the driving pattern during drowsy driving. Since the alarm is issued, a warning is given to the driver when he / she falls asleep so that the driver can be informed that he / she was in the drowsiness driving state and the necessity of taking an appropriate break can be determined. Moreover, since the alarm does not stop until the vehicle stops, the driver can be surely allowed to take a break, and safe driving can be secured.

[Brief description of drawings]

FIG. 1 is a block diagram showing a basic configuration of a digital operation data recording device according to the present invention, FIG. 2 is a diagram showing an embodiment of a digital operation data recording device according to the present invention, and FIG. 3 is an IC memory card FIG. 4 is a diagram showing a recording area provided in FIG. 4, FIG. 4 is a diagram for explaining an example of a method of compressing digital operation data regarding speed, and FIGS. 5 and 6 are jobs performed by the CPU in FIG. A flowchart shown in FIG. 7 is a diagram for explaining a method of the drowsiness warning process. 2 ... IC memory card (recording medium), 12c ₁ ... CPU (compressing means), 12c ₂ ... CPU (comparing means), 12d ₁ ... Internal memory (pattern storage means), 12d ₂ ... Internal memory (operation data storage means) , 12i ... Alarm sound generator (alarm means).

Claims (2)

(57) [Scope of utility model registration request] 1. A digital operation data which is mounted on a vehicle and which compresses digital operation data indicating an operation state of the vehicle by a compression means and records the compressed digital operation data on a detachably mounted recording medium. In the recording device, the pattern storage means in which digital data of a traveling pattern for a predetermined time, which represents a change in traveling speed during drowsy driving, is stored in advance, and the latest digital operation data are sequentially stored, and the latest digital operation is performed. Operation data storage means for holding digital operation data for a predetermined time before the data, and digital operation information stored in the operation data storage means each time the latest digital operation data is stored in the operation data storage means. Comparing means for comparing the data with the digital data stored in the pattern storing means; Therefore, a recording device for digital operation data, comprising: an alarm means for issuing an alarm when it is detected that both data match or are similar. 2. The digital operation data recording device according to claim 1, wherein the alarm means keeps issuing an alarm until the vehicle stops.