JP3265932B2 - Electronic odometer, mileage writing device, and mileage writing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic odometer, a mileage writing device, and a mileage writing method. The present invention relates to an electronic odometer provided with a nonvolatile storage device capable of writing data, or a mileage writing device and a mileage writing method capable of setting new integrated mileage data in an electronic odometer.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 10, an electronic odometer 1 detects the mileage of a vehicle with a distance sensor.
The output pulses of the distance sensor are counted, and when the vehicle travels a certain distance, the distance sensor 1 performs digital arithmetic processing in a CPU (central processing unit) 2 according to a predetermined distance calculation program. Are sequentially counted. Reference numeral 3 denotes an ignition switch (IGN / SW).

Reference numeral 4 denotes a nonvolatile storage device, which is a CPU 2
Thus, the traveling distance data can be written or the stored traveling distance data can be read out, and the traveling distance data written and integrated sequentially is stored as it is even if the power supply is cut off. Reference numeral 5 denotes a mileage display device (odometer), which includes a mileage indicator 6 including a 7-segment light-emitting diode (LED) constituted by a light-emitting diode and the like and a decoder driver 7 thereof.

Next, an example of writing / reading the traveling distance data to / from the nonvolatile storage device 4 will be described with reference to a flowchart of FIG. The CPU 2 determines whether or not the vehicle has traveled 100 m by generating and measuring a distance pulse of the distance sensor 1 in step S1.
If the vehicle is not traveling m, it waits. When the distance pulse is measured and the traveling distance reaches 100 m, the process proceeds to step S2. In step S2, the generation cycle of the distance pulse is calculated. In the next step S3, it is determined whether or not the generation cycle is longer than a cycle corresponding to a preset integrated invalid speed (for example, 200 km / h).

In step S3, it is determined whether or not the speed is equal to or lower than the integrated invalid speed (the maximum speed at which the vehicle can travel). If the speed is equal to or lower than the invalid operation speed, the process proceeds to step S4 where the nonvolatile storage device 4 The stored distance data is read out, the distance data read out in step S5 is set to +0.1, and the process proceeds to step S6. In step S6, the distance data is written to the nonvolatile storage device 4. Step S3
If the speed is equal to or higher than the calculation invalid speed, the process returns to step S1. The distance data stored in the non-volatile storage device 4 is read out, the distance data is code-converted into a binary-coded decimal (BCD) output signal, and the distance traveled by the travel distance indicator 6 via the decoder driver 7. Is displayed.

[0006]

In the conventional electronic odometer, when the failure or the rewriting life of the nonvolatile storage device is reached, it is necessary to write the integrated mileage data before replacement in the replaced nonvolatile storage device. There is. However, conventionally, when writing the accumulated traveling distance data, the distance pulse must be continuously applied to the CPU 2 to be written. For example, using a 4p / rev sensor as a distance sensor,
When a pulse equivalent to 300 km / h is input, it takes about 33.3 hours to write 10.000 km as the integrated traveling distance data. As described above, the conventional electronic odometer has a disadvantage that it takes a very long time to confirm the setting of the distance data.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has been made in consideration of the above-described problem. It is an object of the present invention to provide a meter, a mileage writing device, and a mileage writing method.

[0008]

Means for Solving the Problems To achieve the above object, the invention according to claim 1 calculates a running distance from a distance pulse, displays a running distance and an integrated running distance, and displays an integrated running distance. In an electronic odometer having a nonvolatile storage device for storing the mileage, a value corresponding to the mileage data stored in the nonvolatile storage device is subtracted from the newly set integrated mileage data by means of subtraction. An electronic odometer which subtracts the added mileage value obtained by the subtraction means into the non-volatile storage device and makes it an integrated mileage data; The integrated mileage data is written in a short time by writing the added mileage value to the mileage value previously written in the non-volatile storage device to obtain the integrated mileage data. It is that to be able to writing.

Further, the invention described in claim 2 is the same as that of FIG.
As shown in (a), in an electronic odometer including a nonvolatile storage device 8a that calculates a mileage from a distance pulse, displays a mileage and an accumulated mileage, and stores the accumulated mileage, The travel distance data stored in the non-volatile storage device 8a is read and transferred to the travel distance writing device 10, and a value corresponding to the travel distance data is calculated from the integrated travel distance data set by the travel distance writing device 10. Receiving the added traveling distance value obtained by the subtraction, and
An electronic odometer which is written in the nonvolatile storage device 8a to be integrated mileage data, and is set by the mileage data written in the nonvolatile storage device 8a and the mileage writing device 10. By calculating a difference mileage value with the accumulated mileage data and writing the difference mileage value to the nonvolatile storage device 8a, new accumulated mileage data can be written in a short time.

[0010] The invention described in claim 3 is the same as that of FIG.
As shown in (b), the mileage is calculated from the distance pulse, the mileage and the accumulated mileage are displayed, and the mileage is calculated in an electronic odometer having a nonvolatile storage device for storing the accumulated mileage. The integrated mileage data set by the distance writing device 10 is transferred to the electronic odometer 8, and a value corresponding to the mileage data stored in the nonvolatile storage device 8a is subtracted from the mileage data. An electronic odometer characterized in that it has a writing means 8c for subtracting by 8d and writing the added mileage value obtained from the subtraction means 8d to the non-volatile storage device 8a and making it an integrated mileage data. Then, the integrated mileage data set by the mileage writing device 10 is transferred to the electronic odometer 8 to calculate the difference mileage value by the electronic odometer 8, and the nonvolatile storage device is used. Short by writing to 8a in is obtained to include writing.

The invention described in claim 4 is the same as that of FIG.
As shown in (a), the mileage is calculated from the distance pulse, the mileage and the accumulated mileage are displayed, and the mileage is calculated in an electronic odometer including a nonvolatile storage device for storing the accumulated mileage. Nonvolatile storage device 8 storing distance data
a, reading means 8b for reading mileage data in the nonvolatile storage device 8a in response to an external write request by the mileage writing device 10, and the integrated mileage data set by the mileage writing device 10. The reading means 8b
Writing means 8c for writing an added mileage value obtained by subtracting a value corresponding to the mileage data stored in the nonvolatile storage device read by the nonvolatile storage device 8a into the nonvolatile storage device 8a, An electronic odometer which starts writing of a mileage calculated from a distance pulse based on the accumulated mileage data written in the nonvolatile storage device 8a, wherein the mileage writing device 10 The electronic odometer 8 responds to the writing request of the integrated mileage data, and transfers the mileage stored in the nonvolatile storage device 8a to the mileage writing device 10 to calculate the added mileage value. This is an electronic odometer that transfers the data to the electronic odometer 8 so that new accumulated mileage data can be written in a short time.

Further, the invention described in claim 5 is the same as that of FIG.
To explain with reference to (b), in an electronic odometer including a nonvolatile storage device that calculates a mileage from a distance pulse, displays a mileage and an accumulated mileage, and stores the accumulated mileage. A non-volatile storage device 8a in which the mileage data is stored, and a reading means for reading the mileage data in the non-volatile storage device 8a in response to a write request of the integrated mileage data set by the mileage writing device 10. 8
b, subtracting means 8d for subtracting a value corresponding to the traveling distance data read by the reading means 8b from the integrated traveling distance data from the traveling distance writing device 10,
Writing means 8c for writing the added mileage value obtained by the subtraction means 8d to the non-volatile storage device 8a, and a distance pulse based on the integrated mileage data written to the non-volatile storage device 8a. This is an electronic odometer that starts writing the calculated mileage, and the integrated mileage data from the mileage writing device 10 is added to the nonvolatile storage device 8a of the electronic odometer 8. An electronic odometer 8 for writing an added mileage value obtained by subtracting the stored mileage in the non-volatile storage device 8a and setting an integrated mileage value. Is made possible.

Further, the invention described in claim 6 is the same as that of FIG.
To explain with reference to (a), the mileage is calculated from the distance pulse, the mileage of the electronic odometer provided with a nonvolatile storage device for displaying the mileage and the accumulated mileage, and storing the accumulated mileage. In a writing device, storage means 10a for reading and storing the mileage data written in the nonvolatile storage device 8a, mileage setting means 19b for setting integrated mileage data, and mileage setting means 1
A subtraction means for subtracting the mileage data written by the storage means from the accumulated mileage data set by 9b, and transferring an added mileage value obtained from the subtraction means to the electronic odometer 8; The subtraction means 10c of the mileage writing device 10 subtracts the mileage written in the nonvolatile storage device 8a from the set integrated mileage data to obtain an electronic value. The new integrated odometer data can be written in a short time by transferring the data to the odometer.

According to a seventh aspect of the present invention, there is provided an electronic mileage including a nonvolatile storage device for calculating a mileage from a distance pulse, displaying the mileage and the accumulated mileage, and storing the accumulated mileage. In the mileage writing method in the meter, the mileage data stored in the nonvolatile storage device is read, and the set integrated mileage data and a value corresponding to the mileage data read from the nonvolatile storage device are read. Is calculated by the subtraction means, and the added mileage value calculated by the subtraction means is written in the non-volatile storage device to set the integrated mileage data. This is a writing method that can write new accumulated traveling distance data.

The invention described in claim 8 is the same as that of FIG.
To explain with reference to (a), the mileage is calculated from the distance pulse, the mileage and the integrated mileage are displayed, and the mileage in the electronic odometer provided with a nonvolatile storage device for storing the integrated mileage. In the writing method, while the integrated mileage data is set by the mileage writing device 10,
The mileage data stored in the non-volatile storage device 8a is read, and a value corresponding to the mileage data stored in the non-volatile storage device 8a is subtracted from the integrated mileage data by the subtraction means 10c and added. A mileage value is calculated, the added mileage value is transferred to the electronic odometer 8, written to the nonvolatile storage device 8a, and integrated mileage data is set. This is a writing method in which new integrated traveling distance data is written in a short time.

The ninth aspect of the present invention relates to FIG.
To explain with reference to (b), the mileage is calculated from the distance pulse, the mileage is displayed on the electronic odometer equipped with a nonvolatile storage device for displaying the mileage and the accumulated mileage, and storing the accumulated mileage. In the writing method, the added mileage data set by the mileage writing device 10 is transferred to the electronic odometer 8 and stored in the storage means 8e.
The added mileage data is calculated by inputting the accumulated mileage data from the storage means 8e and the mileage data from the read means 8b to the subtraction means 8d, and the added mileage data is written to the nonvolatile memory via the writing means 8c. This is a mileage writing method characterized by setting the written integrated mileage data in the storage device 8a, and is a writing method so that new integrated mileage data can be written in a short time.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. In the electronic odometer, the electronic odometer is replaced due to the life or failure of the nonvolatile storage device. At this time, it is necessary to write the accumulated mileage data stored in the non-volatile storage device to a new non-volatile storage device. Since the accumulated mileage data is written in a short time, workability is improved. Necessary, as described above. As an embodiment thereof, an electronic odometer capable of setting an integrated mileage by performing an arithmetic processing based on the integrated mileage data set by the mileage writing device, and an electronic odometer by calculating the integrated mileage data There are mileage writing devices for writing to the odometer and a mileage writing method of the integrated mileage data thereof.

First, an embodiment of an electronic odometer of the present invention and its mileage writing device will be described with reference to a block diagram based on FIG. In the figure, reference numeral 8 denotes an electronic odometer, and reference numeral 10 denotes a mileage writing device capable of setting and writing an integrated mileage value in the electronic odometer 8. A distance pulse is input from the distance sensor 1 to the CPU 2 via an I / F (interface) circuit 1a,
The distance pulse is arithmetically processed by the CPU 2 to generate travel distance data, and the travel distance data is stored in the nonvolatile storage device 4.
Is stored. Non-volatile storage device (non-volatile memory) 4
Is stored once in the RAM, the display value represented by the integrated travel distance data (BCD) is converted into a 7-segment display code, and the travel distance display 6 is transmitted through the decoder driver 7. Is displayed.

The travel distance writing device 10 sets an integrated travel distance value, and inputs the data value to the CPU 2 via the I / F circuit 10a. Further, as shown in FIG. 3, the traveling distance writing device 10 includes a CPU 11, an I / F circuit 11a, and a CRT 14, and the CPU 11
M12 and RAM 13 are provided. The output signal (integrated mileage data) of the electronic odometer 8 is transmitted to the I / F circuit 1
A ROM 12 which is input to the CPU 11 via the memory 1a and in which a control program is written, and a RAM 13 in which integrated mileage data of the electronic odometer 8 and the like are written. The integrated mileage data stored in the RAM 13 is converted from a BCD code into a 7-segment display code by the decoder driver 7 and input to the mileage display 6.
The mileage is displayed.

Next, the transmission control procedure of FIG. 4 and FIGS.
2 and 3, the electronic odometer, the mileage writing device, and the mileage writing method thereof will be described. 4 includes an electronic odometer (meter) 8 and a mileage writing device (tester) 1.
An outline of a data request and a data transfer in writing integrated travel distance data between 0 and 0 is shown. FIG. 1A shows a case where the added mileage value is set by the mileage writing device 10. The mileage writing device 10 makes an external writing request to the electronic odometer 8 and The mileage data stored in the non-volatile memory 4 of the odometer 8 is transferred to the mileage writer 10, and the mileage writer 1
The added mileage value set by 0 is transferred to the electronic odometer 8.

FIG. 2B shows the transmission and reception of data when the added mileage value is set by the electronic odometer 8. The mileage writing device 10 issues an integrated mileage write request. The electronic odometer 8 requests the set mileage data (new integrated mileage data) when the passwords are matched with each other. That is, the mileage writing method differs depending on whether the subtraction means for calculating the added mileage value is provided in either the electronic odometer 8 or the mileage writing device 10. Hereinafter, a detailed description will be given based on the flowcharts of FIGS.

First, based on FIGS. 5 and 6, FIG.
An operation flow in the case where the added mileage value is set by the mileage writing device 10 according to (a) will be described. FIG. 5 is an operation flow of the traveling distance writing device (tester).
In the figure, in step S1, the traveling distance writing device 1
From 0, an external write request is made to the electronic odometer 8. The external write request may include a password. In step S2, in response to the write request, the current integrated mileage data (odd value) stored in the replaced nonvolatile storage device 4 is read from the electronic odometer 8 and
11 is written to the RAM 13. It is determined in step S3 whether or not reading has been performed. If reading has not been performed, the process returns to step S2, and upon completion of reading, the process proceeds to step S4. In step S4, the read accumulated traveling distance data is written into the RAM 13, and R
The accumulated mileage data written in the AM 13 is read out, converted into a 7-segment display code by the decoder driver 7, and displayed on the CRT 14.

Then, the process proceeds to step S5, where the set integrated traveling distance data (setting data) is stored in the traveling distance writing device 1.
Enter 0. It is determined in step S6 whether or not the setting data has been input. When the input has been completed, the process proceeds to step S7. In step S7, the accumulated mileage data stored in the nonvolatile storage device 4 is subtracted from the accumulated mileage data to calculate an added mileage value (added data), and the process proceeds to step S8. In step S8, the added data is transferred from the mileage writing device 10 to the electronic odometer 8.
In step S9, it is determined whether or not the transfer of the addition data has been completed. If the transfer of the addition data is completed, the operation flow of the traveling distance writing device is completed. The addition data is written to the nonvolatile storage device 4 of the electronic odometer 8 and the addition data is added to the mileage data written in advance to obtain new integrated mileage data.

Next, an operation flow of the electronic odometer (meter) will be described with reference to FIG. In this figure, the mileage writing device writes the integrated mileage data with the electronic odometer set to the write mode. Less than,
The details will be described. In FIG.
In step 1, it is determined whether there is an external write request from the mileage writing device 10. If there is an external write request, the electronic odometer 8 is set to a distance pulse measurement prohibited state in step S2. Subsequently, the process proceeds to step S3, where the nonvolatile storage device 4
Is read and transmitted to the mileage writing device 10. In step S4, it is determined whether the transmission has been completed, and the process proceeds to step S5. In step S5, the traveling distance writing device 10
Receives the added mileage value (added data) transmitted to the electronic odometer 8 from. In step S6,
It is determined whether or not the addition data has been received. If the reception has not been completed, the process returns to step S5. If the reception of the addition data has been completed, the process proceeds to step S7. In step S7, the added data is written in the nonvolatile storage device 4, and the accumulated mileage data (odd data) is set to be new accumulated mileage data. The new integrated mileage data is converted into a 7-segment display code by the decoder driver 7 and supplied to the mileage display 6 to display the integrated mileage. In step S8, the distance pulse measurement prohibition state of the electronic odometer 8 is released, and the distance pulse from the distance sensor 1 is input to set the measurement permission state.

That is, in the electronic odometer of the present invention and the mileage writing device thereof, the mileage data stored in the nonvolatile storage device of the electronic odometer replaced due to a failure or the like is represented by D, Assuming that the accumulated traveling distance data newly set by the traveling distance writing device is DT, the difference traveling distance value (DT-D) is calculated and obtained by the traveling distance writing device. The difference odometer value (DT-D) is written to the nonvolatile storage device of the electronic odometer as addition data. This non-volatile storage device stores new accumulated traveling distance data. The electronic odometer starts counting distance pulses from the new accumulated mileage data DT and starts integrating the accumulated mileage data.

Next, an example of a mileage writing method using an electronic odometer will be described with reference to FIG. 6 is a flowchart for setting a new integrated mileage value by transferring integrated mileage data to an electronic odometer in response to a write request of the mileage writing device 10; FIG. 7 shows an example in which the electronic odometer is set to the write mode in response to a write request from the mileage writing device 10, and the integrated mileage value is written. Hereinafter, this will be described in detail with reference to FIG.

In FIG. 2, when the travel distance writing device 10 requests the electronic odometer 8 to write the integrated travel distance in step S1, the process proceeds to step S2. The electronic odometer 8 reads the password and proceeds to step S3. In step S3, it is determined whether the passwords match. Steps S2 and S3 are designed to be written by a specific worker in order to prevent tampering of the accumulated traveling distance data. If the passwords match, the process proceeds to step S4, in which the input of the distance pulse from the distance sensor 1 is prohibited. continue,
Proceeding to step S5, the current traveling distance data stored in the exchanged nonvolatile storage device 4 is read into the RAM of the CPU 2, and the procedure proceeds to step S6. The current nonvolatile memory device 4 writes several types of travel distance data in advance, selects data that is close to the integrated travel distance data to be set, and writes insufficient integrated travel distance data. It is. In step S6, the set mileage data is requested by the electronic odometer 8, and the process proceeds to step S7. In step S7, the travel distance writing device 10
When the set integrated mileage data is input from, the process proceeds to step S8. In step S8, the accumulated mileage data stored in the RAM is read, and the mileage data stored in the non-volatile storage device is read, and the mileage data is calculated from the accumulated mileage data by subtraction means. To calculate the added mileage value. continue,
Proceeding to step S9, the added mileage value is written so as to be added to the mileage data stored in the nonvolatile storage device 4, and displayed on the mileage writing device 6. In step S10, distance pulse measurement is permitted. Distance pulse is CP
Input to U2, the travel distance is measured by the distance pulse, and integration of the travel distance is started.

The non-volatile storage device 4 will now be described. As shown in FIG.
a, ROM 2b, includes a RAM 2c, the RAM 2c includes address pointer 2 _1, the travel distance storage area ₂ 2 21 to _24. The nonvolatile storage device 4 is connected to the CPU 2. The ROM2b control program is written, RAM 2c for storing various data generated in the operation process, the address pointer 2 ₁ that specifies the address of recording data, distance counter 2a for counting the distance pulses from the distance sensor 1 and the distance travel distance storage area 2 ₂ 21 to ₂₄ in which data is recorded is provided.

As an example, the nonvolatile storage device 4 is composed of 128 × 8 bits as shown in FIG.
Up to 24 are formed by the address area 4a and the counter area 4b. The writing of vehicle mileage data is shown in FIG.
As shown in (a), "FF" is first recorded in the address area 4a in hexadecimal. Address pointer 2 ₁ in this state is indicated to address 0. Thereafter, the vehicle starts running, the vehicle is a predetermined distance by the distance pulses from the distance sensor 1, for example, if 1Km travel, as shown in FIG. 9 (b), currently stored in the address 0 indicated address pointer 2 ₁ To the existing data "FF"
1 is added to “00”. When the vehicle travels 2 km, as shown in FIG.
₁ by adding +1 to the data "FF" of the address 1 indicated by the "00". If the mileage is 126 km,
As shown in FIG. 9C, data “00” is stored at address 0.
Is added to +1 to obtain “01”. The running distance is 32
When the number reaches 000 Km, “FF” in hexadecimal is recorded at the final address 124, “1111, 1111” in binary, and +1 is added to “FF” in hexadecimal for all of the counters 1 to 3 to “00”. Become. When the 1 km running distance is counted, the address pointer 0 becomes "01".

In the nonvolatile storage device 4, the traveling distance can be read by reading the recorded data of each address 4a and the data of the counters 1 to 34b. The reading of the traveling distance can be obtained by the following equation. This arithmetic expression is obtained as follows: mileage = 3200
0 × [(counter value) +1] + 125 × [(data value of nonvolatile storage device indicated by address pointer) +1] +
(Address pointer value) is represented by Km. Further, in the nonvolatile storage device 4, 125 km can be rewritten by one rewriting.

As is well known, the number of times of rewriting of the nonvolatile memory device of the electronic odometer 8 is limited, and it is necessary to replace the nonvolatile memory device before reaching the limit. In such a case, a nonvolatile storage device in which predetermined traveling distance data has been previously written in the nonvolatile storage device is selected and replaced. For example, if the traveling distance is 32124 km, 3
A non-volatile storage device in which a mileage of 2000 Km is written is selected and mounted, and a fractional mileage value of 124 K
By setting m with a mileage writing device or an electronic odometer, the integrated mileage can be set in a short time. In recent years, the writing resolution of the traveling distance is 1 km, and the writing time per 1 km is 10 msec. That is, the writing of the remaining running distance of 124 km is
Writing will be done in 1.24 seconds.

Also, when the electronic odometer fails,
If only the nonvolatile storage device is abnormal, if the accumulated mileage data is recorded in the RAM of the CPU provided in the electronic odometer, the accumulated mileage data is read by the mileage writing device, Based on the accumulated mileage data, the mileage may be written by the mileage writing device into the non-volatile storage device storing the predetermined mileage data.

Further, for the purpose of preventing tampering of the integrated odometer data of the electronic odometer, a protector is provided so that even if subtraction data is inputted, it is not accepted. Also, unless a password is provided and the password does not match, the writing mode of the new integrated mileage data is not opened, and
The calculation in the minus direction is not possible, and the running distance can be added only in the plus direction to prevent the accumulated running distance from being falsified.

Further, according to the present invention, an integrated odometer value of an electronic odometer can be written without necessarily providing a writing device. For example, an odometer trip switch (a switch for setting an integrated mileage value) is provided in an electronic odometer, and a new integrated mileage value is set by the od / trip switch. And a new integrated mileage can be set. That is, the writing device of the above embodiment is not limited to the one provided separately from the electronic odometer, but may include the one provided with an odd trip switch in the electronic odometer.

[0035]

As described above, the electronic odometer according to the present invention is provided with a writing mode using a mileage writing device in addition to a writing mode for a mileage using a distance pulse. The distance writing device has an advantage that the accumulated traveling distance data can be reset. Therefore, it is possible to automate the writing of the integrated mileage data in the electronic odometer, and there is an advantage that the burden on the worker who writes the integrated mileage data can be reduced.
There is an advantage that the integrated traveling distance can be set in a short time.

The electronic odometer of the present invention is provided with a writing mode separately from a mode in which a pulse is input from a distance sensor to measure a traveling distance. By opening the control program of this writing mode, the integrated odometer data is written, and the one in which the odometer value is written in advance in the nonvolatile storage device of the replaced electronic odometer is replaced. By writing the difference travel distance value, there is an advantage that a new integrated travel distance can be written in a short time.

Further, in the mileage writing device of the present invention, the mileage value stored in the nonvolatile storage device is read out from the electronic odometer and written in the mileage writing device, and the subtraction of the mileage writing device is performed. By calculating the difference mileage value by the means and writing the difference mileage value to the nonvolatile storage device of the electronic odometer, there is an advantage that writing can be performed in a short time.

[Brief description of the drawings]

1 (a) and 1 (b) are functional block diagrams of an electronic odometer and a mileage writing device of the present invention.

FIG. 2 is a block diagram showing an embodiment of an electronic odometer and a mileage writing device according to the present invention.

FIG. 3 is a block diagram showing one embodiment of a traveling distance writing device according to the present invention.

FIGS. 4A and 4B are explanatory diagrams showing a transmission control procedure between the electronic odometer and the mileage writing device.

FIG. 5 is a flowchart illustrating an operation of the traveling distance writing device.

FIG. 6 is a flowchart illustrating the operation of the electronic odometer.

FIG. 7 is a flowchart illustrating the operation of the electronic odometer.

FIG. 8 is a block diagram of an electronic odometer.

FIG. 9 is an explanatory diagram of each memory area of the nonvolatile storage device.

FIG. 10 is a block diagram of a conventional traveling distance display device.

11 is a diagram showing a flowchart showing the operation of the traveling distance display device of FIG.

[Description of Signs] 1 Distance sensor 2, 11 CPU 4 Non-volatile storage device 5 Odometer display device 6 Odometer display device 7 Decoder driver 8 Electronic odometer 10 Odometer device 1a, 10a, 11a Interface circuit 12 ROM 13 RAM 14 CRT

Claims (9)

(57) [Claims] 1. An electronic odometer having a nonvolatile storage device for calculating a mileage from a distance pulse, displaying the mileage and an accumulated mileage, and storing the accumulated mileage. A value corresponding to the mileage data stored in the nonvolatile storage device is subtracted from the accumulated mileage data by the subtraction means, and the added mileage value obtained by the subtraction means is written to the non-volatile storage device. An electronic odometer characterized by using distance data. 2. An electronic odometer including a nonvolatile storage device for calculating a mileage from a distance pulse, displaying a mileage and an accumulated mileage, and storing the accumulated mileage. The mileage data stored in the device is read and transferred to the mileage writing device, and the added mileage obtained by subtracting the value corresponding to the mileage data from the integrated mileage data set by the mileage writing device. An electronic odometer which receives a distance value and writes it into said non-volatile storage device by writing means to obtain integrated mileage data. 3. An electronic odometer provided with a nonvolatile storage device for calculating a mileage from a distance pulse, displaying the mileage and the accumulated mileage, and storing the accumulated mileage. The integrated mileage data set by the device is transferred to the electronic odometer, and a value corresponding to the mileage data stored in the nonvolatile storage device is subtracted from the mileage data by subtraction means. An electronic odometer comprising writing means for writing the added mileage value obtained from the means into the nonvolatile storage device and making it an integrated mileage data. 4. An electronic odometer provided with a nonvolatile storage device for calculating a mileage from a distance pulse, displaying the mileage and an integrated mileage, and storing the mileage. A stored non-volatile storage device, reading means for reading the travel distance data of the nonvolatile storage device in response to an external write request by the travel distance writing device, and the integrated travel distance data set by the travel distance writing device Writing means for writing the added mileage value obtained by subtracting the value corresponding to the mileage data stored in the non-volatile storage device read out by the reading means from the non-volatile storage device into the non-volatile storage device. And starting writing of a travel distance calculated from a distance pulse based on the integrated travel distance data written in the nonvolatile storage device. Odometer. 5. An electronic odometer having a nonvolatile storage device for calculating a mileage from a distance pulse, displaying the mileage and an integrated mileage, and storing the mileage. A non-volatile storage device that stores the data, a reading unit that reads the mileage data of the nonvolatile storage device in response to a write request of the integrated mileage data set by the mileage writing device, Subtraction means for subtracting a value corresponding to the mileage data read by the reading means from the integrated mileage data; and writing means for writing the added mileage value obtained by the subtraction means to the nonvolatile storage device And starting to write a mileage calculated from a distance pulse based on the accumulated mileage data written to the nonvolatile storage device. Electronic odometer according to claim. 6. A mileage writing device for an electronic odometer having a nonvolatile storage device for calculating a mileage from a distance pulse, displaying a mileage and an accumulated mileage, and storing the accumulated mileage. Storage means for reading and storing the mileage data written in the non-volatile storage device; mileage setting means for setting integrated mileage data; and calculating the mileage data from the mileage data set by the mileage setting means. Subtraction means for subtracting a value corresponding to the mileage data written in the storage means, wherein the added mileage value obtained from the subtraction means is transferred to the electronic odometer. Device. 7. A mileage writing method in an electronic odometer having a nonvolatile storage device for calculating a mileage from a distance pulse, displaying a mileage and an integrated mileage, and storing the accumulated mileage. Reading the mileage data stored in the non-volatile storage device, calculating a value corresponding to the set integrated mileage data and the mileage data read from the non-volatile storage device by subtraction means, A mileage writing method, wherein the integrated mileage data is set by writing the added mileage value calculated by the means into the nonvolatile storage device. 8. A mileage writing method in an electronic odometer having a nonvolatile storage device for calculating a mileage from a distance pulse, displaying a mileage and an accumulated mileage, and storing the accumulated mileage. The mileage writing device sets the accumulated mileage data, reads the mileage data stored in the nonvolatile memory device, and stores the mileage data in the nonvolatile memory device from the accumulated mileage data by subtraction means. Subtracting a value corresponding to the obtained mileage data to calculate an added mileage value, transferring the added mileage value to the electronic odometer, writing the same in the nonvolatile storage device, and setting the accumulated mileage data. A mileage writing method characterized by the above-mentioned. 9. A mileage writing method for an electronic odometer having a nonvolatile storage device for calculating a mileage from a distance pulse, displaying the mileage and the accumulated mileage, and storing the accumulated mileage. The additional mileage data set by the mileage writing device is transferred to the electronic odometer and stored in the storage means;
The accumulated mileage data from the storage means and the mileage data from the read means are input to the subtraction means to calculate the added mileage data, and the added mileage data is written to the nonvolatile storage device via the writing means. A travel distance writing method, wherein integrated travel distance data is set.