JPH038095A - Digital tachograph - Google Patents

Abstract

PURPOSE:To prevent car speed data in a recording medium from being falsified by executing time adjustment only before the initialized recording medium is inserted to the main body of a tachograph and driving is started and prohibiting the car speed data to be recorded to any medium excepting for the medium afterwards. CONSTITUTION:In a memory area 5a of a memory card 5, the recording area of a timer ID code is provided to store different data each time an initializing state is identified and time is adjusted. In a memory area 14a of a RAM in a main body 2 of the digital tachograph, the timer ID code is stored to store the various data each time the time adjustment is operated. Then, only when the card is initialized as a result to read the card area 5a by a CPU 12 and a car is stopped, it is permitted to adjust the time. The card 5 is compared with the timer ID code of the main body 2 and it is decided that the code is most newly updated or not. When the card and code are not coincident, it is prohibited to record the car speed data to the card 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a digital tachograph having a time adjustment function.

[Prior Art] Conventionally, some digital tachographs include a storage medium such as a memory card that can be inserted into the digital tachograph body, and a clock. Then, time data and vehicle speed data from a vehicle speed sensor are recorded on the storage medium. Furthermore, it was equipped with a time adjustment function that corrected the advance or delay of the time due to special training.

[Problems to be Solved by the Invention] However, in such a digital tachograph whose time can be adjusted by the user, the following operations are possible. That is, for example, the vehicle operates normally from 1:00 to 2:00, and vehicle speed data is recorded. ■It operates without inserting a storage medium from 2:00 to 3:00. ■After adjusting the time to 2:00, insert the storage medium and operate normally. When the vehicle is operated in accordance with the above procedure, vehicle speed data is recorded on the storage medium as shown in FIG. As can be seen from FIG. 5, although vehicle speed data from 2 o'clock to 3 o'clock can be handled, this data does not appear in the data recorded on the storage medium.

An object of the present invention is to provide a digital tachograph that can prevent such tampering of vehicle speed data on a recording medium.

[Means for Solving the Problems] As shown in FIG. 1, the present invention has a time adjustment function and stores vehicle speed data by vehicle speed detection means M3 in a storage medium M2 that can be inserted backward into the digital tachograph main body M1. In the digital tachograph configured to record, an initialization identification formed in a part of the storage area of the storage medium M2 for storing initialization identification data for identifying that the storage medium M2 has been initialized. Data storage area M
4, formed in a part of the storage area of the storage medium M2,
A time adjustment identification data storage area M5 for storing different time adjustment identification data for each time adjustment operation, and a time adjustment identification data storage area M5 provided in the digital tachograph main body M1 to store different second time adjustment identification data for each time adjustment operation. time adjustment identification data storage means M6 for and initialized storage medium M
a first data rewriting means M7 that rewrites the initialization identification data of the storage medium M2 as the vehicle speed data is recorded in the storage medium M2;
As a result of reading the initialization identification data of the storage medium M2, the time adjustment is permitted only when the storage medium M2 is an initialized storage medium and the vehicle speed detecting means M3 detects that the vehicle has stopped. When the time is adjusted when the time adjustment is permitted by the time adjustment permission means M8, the time adjustment identification data in the storage medium M2 and the time adjustment identification data storage means M6 in the digital tachograph main body M1 are stored. a second data rewriting means M9 for updating the second time adjustment identification data to new data;
It is determined whether the time adjustment identification data of the storage medium M2 and the second time adjustment identification data of the time adjustment identification data storage means M6 of the digital tachograph main body M1 are the latest updated data by the second data rewriting means M9. When both data are not the latest updated data, storage medium M2
The gist thereof is a digital tachograph equipped with a recording inhibiting means MIO for inhibiting the recording of vehicle speed data.

[Operation] The first data rewriting means M7 initializes the initialized storage medium M2.
As the vehicle speed data is recorded in the storage medium M2, the initialization identification data of the storage medium M2 is rewritten, and as a result of reading the initialization identification data of the storage medium M2, the storage medium M2 is initialized. only when the vehicle speed detecting means M3 detects that the vehicle has stopped.
Allows time adjustment, and further includes a second data rewriting means M
9 indicates that when the time is adjusted when the time adjustment is permitted by the time adjustment permission means M8, the time adjustment identification data in the storage medium M2 and the second time adjustment determination data in the time adjustment identification data storage means M6 of the digital tachograph main body M1. and updated with new data. Then, the recording prohibition means M10 updates the time adjustment identification data of the storage medium M2 and the second time adjustment identification data of the time adjustment identification data storage means M6 of the digital tachograph main body M1 to the latest by the second data rewriting means M9. If both data are not the latest updated data, recording of the vehicle speed data to the storage medium M2 is prohibited.

As a result, the time can be adjusted only before starting traveling with the initialized storage medium M2 inserted into the digital tachograph main body M1.

Further, when the time adjustment is performed, the time adjustment identification data storage area M5 of the storage medium M2 and the digital tachograph main body M
New data is updated in the time adjustment identification data storage means M6 of No. 1, and from now on, the storage medium M2 in which this data is recorded is updated.
Unless this is used, vehicle speed data cannot be recorded on the storage medium M2.

[Example 1] An example embodying the present invention will be described below with reference to the drawings.

FIG. 3 shows the digital tachograph 1 of this embodiment, in which a card insertion slot 3 is formed on the front surface of the digital tachograph main body 2 formed in a box shape.

A lock bin 4 is rotatably disposed in the card insertion slot 3, and by placing the lock bin 4 in a horizontal position as shown by the dashed line in FIG. 3, a memory card 5 as a storage medium can be inserted and removed. Also, lock bin 4
By placing the memory card 5 in the vertical position shown by the solid line in FIG. 3, the memory card 5 can be prevented from being handled. Further, a lock switch 6 is provided on the support shaft portion of the lock bin 4, and the lock switch 6 outputs an on signal when the lock bin 4 is in the vertical state (locked state).

Further, various operation switches 7a to 7f are arranged on the front surface of the digital tachograph main body 2, and operation switches 78 to 7e
By operating the button, data such as the start and end of the service can be entered, and the time can be adjusted using the time setting key 7f. A display device 8 is arranged on the front of the digital tachograph main body 2,
This display device 8 displays data such as time and vehicle speed. A green LED 9 and a red LEDIO are arranged at the center of the front surface of the digital tachograph main body 2.

FIG. 4 shows the electrical configuration of the digital tachograph of this embodiment. A microcomputer 11 is built into the digital tachograph body 2. This microcomputer 11 has a central processing unit (hereinafter referred to as C
PLI) 12 and read-only memory (ROM)
13, and a random access memory (RAM) 14 as time adjustment identification data storage means.

The CPtJ 12 receives a pulse signal from a vehicle speed detector 16 as a vehicle speed detecting means via an interface circuit 15 and measures the vehicle speed at every fixed sampling synchronization. or,
The ROM 13 stores a program for operating the CPtJ 12, and the RAM 14 temporarily stores the data. Roughly speaking, an oscillator 17 is connected to the CPU 12, and the CPtJ 12 performs a timekeeping operation using a pulse signal from the oscillator 17.

A display device 8, operation switches 7a to 7f, LEDs 9 and 10, an ignition switch 19, and a lock switch 6 are connected to the interface circuit 18. Data is exchanged between the CPLJ 12, the interface circuit 18, and the memory card 5.

The RAM 14 has an area 14 for recording the clock ID code.
a is prepared. The memory card 5 also has a storage area 5a as a time adjustment identification data storage area in which a clock ID code is written. No clock ID code is written in this area 5a when the memory card 5 is initialized in an office machine.

Next, the operation of the digital tachograph configured as described above will be explained based on FIG. 2.

When the memory card 5 is inserted into the digital tachograph body 2 and the lock bin 4 is placed in a vertical position, the lock switch 6 is turned on and the insertion of the memory card 5 is detected. Incidentally, the presence or absence of the memory card 5 may be determined based on a match between a data value written to a predetermined address of the memory card 5 and a data value known in advance.

Based on the ON operation of the lock switch 6, the CPU 12 reads data from the storage area 5a of the memory card 5 in which the watch ID code is written in step 100, and determines whether this data is the watch ID code. At this time, when the initialized memory card 5 is inserted, the CPU 12 determines in step 100 that the data is not a watch ID code, and in step 101 accepts the time change signal output from the operation switch 7f. The time is changed according to a pre-installed program. Then, the CPU 12 maintains the state of step 101 until the vehicle speed pulse output from the vehicle speed detector 16 is inputted in step 102.

When the CPU 12 inputs the vehicle speed pulse in step 102, it determines whether or not the time has been changed in step 103, and if it is determined that the time has been changed, the pulse is stored in the storage area 14a of the RAM 14 in step 104. The watch ID code is updated and written in the storage area 5a of the memory card 5. or,
If the CPU 12 determines in step 103 that the time has not been changed, the CPU 12 updates the RA in step 105.
This watch ID code is written into the storage area 5a of the memory card 5 without updating the watch ID code stored in the storage area 14a of M14.

When the processing in steps 104 and 105 is completed, the CPU 12 inputs and processes the vehicle speed pulse output from the vehicle speed detector 16 and the signal output from the camera 17 in step 106, generates vehicle speed data, and stores this data. memory card 5
write to.

In this way, in step 100 it is determined that the memory card 5 is an initialized memory card, and in step 1
Until the vehicle speed pulse is input in step 02, that is, while the vehicle is stopped, time adjustment is permitted in step 101. Therefore, for example, an initialized memory card 5
Even if an attempt is made to adjust the time after recording driving data, the clock ID code is occupied by step 104 or 105, so the determination result in step 100 is YES, and the correction is performed in step 101. I can't. Further, if there is no time adjustment, the clock ID code in the RAM 14 is not updated in step 105 and the code is stored in the storage area 5a of the memory card 5, and if there is a time adjustment, the code is stored in the RAM 14 in step 104.
The watch ID code of is updated and the code is stored in the storage area 5a of the memory card 5.

If the CPU 12 determines that the read data is an ID code in step 100, the CPU 12 executes step 10.
7 reads the clock ID code stored in the memory area 1tc14a of the RAM 14 and stores this code and the memory card 5.
and the clock ID code in the storage area 5a, and it is determined whether these two 10 codes match. CPU
12 performs processing in step 106 if it is determined in step 107 that they match. Also, CPU12
If it is determined in step 107 that they do not match, then in step 108 the display device 8 displays a message indicating that "vehicle speed data will not be recorded."

If Shun handles the memory card 5 through the processing in step 107 and inserts it again, the clock ID codes will match in step 107 and data will be recorded. If another memory card is inserted after that, the data will not be recorded in step 107 because the watch ID codes do not match.

Due to this operation, the memory card 5 records only the vehicle speed data that corresponds to the unique way the time advances.
Therefore, the vehicle speed corresponding to the time before handling and the vehicle speed corresponding to the time after the time change are not recorded on the same storage medium (memory card 5).

In this way, this embodiment provides a clock ID in the storage area 5a of the memory card 5 (storage medium) to identify that the memory card 5 has been initialized and to store different data for each time adjustment operation. Provide a storage area for the code,
Further, a time it ID code for storing different data for each time adjustment operation is stored in the storage area 14a of the RAM 14 of the digital tachograph main body 2, and the CPU
As a result of reading out the clock ID code of the memory card 5 by 12, the time adjustment is allowed only when the memory card 5 is an initialized memory card and the vehicle is stopped. Furthermore, if the time is adjusted when time adjustment is permitted, the watch ID code is updated, and if the time is not adjusted, the watch ID code is stored in the storage area of the memory card 5 without updating the watch ID code. 5a
and storage area 1 of RAM 14 of digital tachograph body 2
4a, and it is determined whether the clock ID code of the memory card 5 and the clock ID code of the digital tachograph body 2 match, that is, whether they are the latest updated codes.If the hour 111D code does not match, the memory card Recording of vehicle speed data to 5 is now prohibited.

As a result, the time can be adjusted only before starting driving with the initialized memory card 5 inserted into the digital tachograph body 2.

Furthermore, vehicle speed data cannot be recorded on the memory card 5 unless the memory card 5 on which the clock ID code matching the clock ID code of the digital tachograph main body 2 is recorded is used. Therefore, if the memory card 5 that was previously used is inserted, data can continue to be recorded on the memory card 5, but even if another memory card is inserted, data will not be recorded, so the data will not be recorded. will not be able to be tampered with.

Note that this invention is not limited to the above embodiments,
In addition to memory cards, recording media include memory cartridges,
It may be a memory cassette or an IC card.

Further, the initialization code for initialization identification of the memory card 5 and the time adjustment identification code for storing different data for each time adjustment do not necessarily need to be stored in the storage area at the same address. However, in this case, it is necessary to erase or update the initialization code every time the time adjustment identification code is written.

[Effects of the Invention] As described in detail above, the present invention provides an excellent effect of preventing vehicle speed data from being tampered with on a storage medium.

[Brief explanation of the drawing]

Fig. 1 is a complaint correspondence diagram, Fig. 2 is a flowchart of the digital tachograph of the embodiment, Fig. 3 is a perspective view of the digital tachograph, Fig. 4 is an electrical block diagram of the digital tachograph, and Fig. 5 is a diagram showing recorded data. It is. 2 is a digital tachograph body, 5 is a memory card as a storage medium, 5a is a storage area as an initialization identification data storage area and a time adjustment identification data storage area, 12 is a time adjustment permitting means, and first and second data rewriting. 14 is a CPU as a recording inhibiting means and a RAM as a time adjustment identification data storage means.

Claims (1)

[Scope of Claims] 1. A digital tachograph having a time adjustment function and recording vehicle speed data by vehicle speed detection means on a storage medium that can be inserted into and removed from the digital tachograph main body, comprising: one of the storage areas of the storage medium; an initialization identification data storage area formed in a part of the storage medium for storing initialization identification data for identifying that the storage medium has been initialized; and an initialization identification data storage area formed in a part of the storage area of the storage medium and used for time adjustment A time adjustment identification data storage area for storing time adjustment identification data that differs for each operation; and a time adjustment provided in the digital tachograph body for storing second time adjustment identification data that differs for each time adjustment operation. an identification data storage means; a first data rewriting means for rewriting the initialization identification data of the storage medium as the vehicle speed data is recorded on the initialized storage medium; and reading the initialization identification data of the storage medium. As a result, the storage medium is an initialized storage medium, and the time adjustment permission means allows the time to be adjusted only when the vehicle speed detection means detects that the vehicle has stopped; and the time adjustment permission means allows the time to be adjusted by the time adjustment permission means. When the time is adjusted when the adjustment is permitted, second data for updating the time adjustment identification data in the storage medium and the second time adjustment identification data in the time adjustment identification data storage means of the digital tachograph main body to new data; a rewriting means, and determining whether the time adjustment identification data of the storage medium and the second time adjustment identification data of the time adjustment identification data storage means of the digital tachograph body are the latest updated data by the second data rewriting means. A digital tachograph comprising: recording prohibition means for prohibiting recording of vehicle speed data on a storage medium when both data are not the latest updated data.