JPH0953953A - Electronic traveling distance meter, method and unit for writing traveling distance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an electronic traveling distance meter, method and unit for writing the traveling distance in which an accumulated traveling distance can be stored easily in the nonvolatile memory of a new electronic traveling distance meter. SOLUTION: A distance pulse is inputted from a distance sensor 1 to a CPU 2 where a distance data is processed and stored, as an accumulated traveling distance data, in a nonvolatile memory 4. The accumulated traveling distance data, stored in the nonvolatile memory 4, is then converted through a decoder driver 7 into a seven segment display code and displayed on a traveling distance display 6. On the other hand, a traveling distance writing unit 10 brings an electronic traveling distance meter 8 into write mode and sets an accumulated traveling distance data. Furthermore, the traveling distance writing unit 10 reads in a traveling distance data from the traveling distance meter 8 and calculates an additive data by subtracting the traveling distance data from the accumulated traveling distance data before setting a new accumulated traveling distance data in the electronic traveling distance meter 8.

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. More specifically, the vehicle mileage is electronically integrated and displayed, and the mileage integrated data is displayed. The present invention relates to a mileage writing device and a mileage writing method capable of setting new accumulated mileage data in an electronic odometer or an electronic odometer provided with a nonvolatile storage device capable of writing.

[0002]

2. Description of the Related Art Conventionally, in an electronic odometer, as shown in FIG. 10, 1 is a distance sensor for detecting the mileage of a vehicle,
When the vehicle travels a certain fixed distance by counting the output pulses of the distance sensor, the distance sensor 1 performs digital arithmetic processing by the CPU (central processing unit) 2 according to a predetermined distance calculation program, The distance pulses are sequentially counted. Reference numeral 3 is an ignition switch (IGN SW).

Reference numeral 4 denotes a non-volatile storage device, which is a CPU 2
The mileage data can be written or the stored mileage data can be read by the mileage data, and the mileage data sequentially written and integrated is stored as it is even if the power supply is cut off. Reference numeral 5 denotes a mileage display device (odometer), which is composed of a mileage indicator 6 including a 7-segment light emitting diode (LED) formed of 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 memory device 4 will be described with reference to the flowchart of FIG. In step S1, the CPU 2 determines whether or not the vehicle has traveled 100 m by generating and measuring the distance pulse of the distance sensor 1, and then 100
Stand by if you are not driving. 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 the cycle corresponding to the preset cumulative invalid speed (for example, 200 Km / h).

In step S3, it is determined whether or not this integrated invalid speed (maximum speed at which the vehicle can travel) or less. If the speed is less than the invalid operation speed, the process proceeds to step S4 and the nonvolatile memory device 4 stores it. The stored distance data is read, the distance data read in step S5 is set to +0.1, and the process proceeds to step S6. In step S6, the distance data is written in 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, the distance data is code-converted into a binary coded decimal (BCD) output signal, and the travel distance is displayed on the travel distance display 6 via the decoder driver 7. Is displayed.

[0006]

In the conventional electronic odometer, it is necessary to write the accumulated mileage data before replacement in the replaced nonvolatile memory device when a failure or the rewriting life of the nonvolatile memory device is reached. There is. However, conventionally, in writing the accumulated travel distance data, it has been necessary to continuously apply the distance pulse to the CPU 2 and write the data. 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 accumulated traveling distance data. As described above, the conventional electronic odometer has a drawback that it takes a very long time to confirm and set the distance data.

The present invention has been made in view of the above-mentioned problems, and it is easy to store the accumulated traveling distance data up to now in a non-volatile storage device in a new electronic odometer. An object of the present invention is to provide a meter, a mileage writing device, and a mileage writing method.

[0008]

The present invention has been accomplished in order to achieve the above object. According to the invention of claim 1, the traveling distance is calculated from the distance pulse, the traveling distance and the accumulated traveling distance are displayed, and the accumulated distance is calculated. In an electronic odometer equipped with a non-volatile memory device for storing the mileage, a value corresponding to the mileage data stored in the non-volatile memory device is subtracted from newly set integrated mileage data by means of subtraction means. The electronic odometer is characterized in that it has a writing means for subtracting and adding the added mileage value obtained by the subtracting means to the integrated storage mileage data written in the nonvolatile memory device. By writing the added mileage value to the mileage value previously written in the non-volatile storage device as the integrated mileage data, the integrated mileage data can be written in a short time. It is that to be able to writing.

The invention described in claim 2 is the same as that shown in FIG.
As shown in (a), in an electronic odometer provided with a nonvolatile storage device 8a for calculating a traveling distance from a distance pulse, displaying the traveling distance and the accumulated traveling distance, and storing the accumulated traveling distance, The mileage data stored in the non-volatile storage device 8a is read out and transferred to the mileage writing device 10, and a value corresponding to the mileage data is calculated from the accumulated mileage data set by the mileage writing device 10. Writing means 8c for receiving the added mileage value obtained by subtraction
The electronic odometer is characterized in that the integrated mileage data is written in the nonvolatile memory device 8a by the mileage data written in the nonvolatile memory device 8a and set by the mileage writing device 10. The new accumulated traveling distance data can be written in a short time by calculating the difference traveling distance value from the accumulated traveling distance data and writing it in the non-volatile storage device 8a.

The invention according to claim 3 is the same as that shown in FIG.
As shown in (b), an electronic odometer equipped with a non-volatile storage device that calculates a mileage from a distance pulse, displays the mileage and the accumulated mileage, and stores the accumulated mileage. The integrated mileage data set by the distance writer 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. 8d, the electronic odometer is characterized by having a writing means 8c for writing the added mileage value obtained from the subtracting means 8d to the nonvolatile memory device 8a as integrated mileage data. , The integrated mileage data set by the mileage writing device 10 is transferred to the electronic odometer 8, the differential mileage value is calculated by the electronic odometer 8, and the nonvolatile memory device is provided. Short by writing to 8a in is obtained to include writing.

The invention according to claim 4 is the same as in FIG.
As shown in (a), an electronic odometer equipped with a non-volatile storage device that calculates a mileage from a distance pulse, displays the mileage and the accumulated mileage, and stores the accumulated mileage. Non-volatile storage device 8 storing distance data
a, a reading means 8b for reading the travel distance data of the nonvolatile storage device 8a in response to an external write request from the travel distance writing device 10, and the integrated travel distance data set by the travel distance writing device 10. The reading means 8b
Writing means 8c for writing the added travel distance value obtained by subtracting the value corresponding to the travel distance data stored in the non-volatile storage device read by the writing means 8c, It is an electronic odometer characterized by starting writing of a mileage calculated from a distance pulse based on the accumulated mileage data written in the non-volatile storage device 8a. The electronic odometer 8 responds to the request for writing the accumulated mileage data, transfers the mileage stored in the nonvolatile storage device 8a to the mileage writing device 10, and calculates the added mileage value. The electronic odometer is adapted to be transferred to the electronic odometer 8 and is capable of writing new integrated mileage data in a short time.

The invention according to claim 5 is the same as that shown in FIG.
Explaining with reference to (b), an electronic odometer provided with a nonvolatile storage device that calculates a traveling distance from a distance pulse, displays the traveling distance and the accumulated traveling distance, and stores the accumulated traveling distance. A non-volatile memory device 8a storing mileage data and a reading means for reading the mileage data of the non-volatile memory device 8a in response to a request for writing the accumulated mileage data set by the mileage writer 10. 8
b, and subtraction means 8d for subtracting a value corresponding to the travel distance data read by the reading means 8b from the integrated travel distance data from the travel distance writing device 10,
Writing means 8c for writing the added traveling distance value obtained by the subtracting means 8d to the non-volatile storage device 8a, and from the distance pulse based on the accumulated traveling distance data written in the non-volatile storage device 8a. It is an electronic odometer characterized by starting to write the calculated mileage, and stores the accumulated mileage data from the mileage writing device 10 in a nonvolatile storage device 8a of the electronic odometer 8. It is the electronic odometer 8 that writes the added mileage value obtained by subtracting the stored mileage to the nonvolatile storage device 8a and sets the integrated mileage value, and writes new accumulated mileage data in a short time. It was made possible.

The invention according to claim 6 is the same as that shown in FIG.
Explaining with reference to (a), the mileage of an electronic odometer provided with a non-volatile storage device that calculates a mileage from a distance pulse, displays the mileage and the accumulated mileage, and stores the accumulated mileage. In the writing device, storage means 10a for reading and storing the travel distance data written in the nonvolatile storage device 8a, travel distance setting means 19b for setting integrated travel distance data, and travel distance setting means 1
And subtraction means 10c for subtracting the travel distance data written by the storage means from the integrated travel distance data set by 9b, and the added travel distance value obtained from the subtraction means 10c is transferred to the electronic odometer 8. The mileage writing device is characterized in that the subtraction means 10c of the mileage writing device 10 subtracts the mileage written in the non-volatile storage device 8a from the set accumulated mileage data, and the electronic data is obtained. The new integrated mileage data can be written in a short time by transferring the data to the odometer.

According to a seventh aspect of the present invention, the traveling distance is calculated from the distance pulse, the traveling distance and the accumulated traveling distance are displayed, and the electronic traveling distance is provided with a non-volatile storage device for storing the accumulated traveling distance. In the mileage writing method in the meter, the mileage data stored in the non-volatile storage device is read, and the set total mileage data and a value corresponding to the mileage data read from the non-volatile storage device are set. Is calculated by the subtracting means, and the added travel distance value calculated by the subtracting means is written in the non-volatile storage device to set the integrated travel distance data. This is a writing method capable of writing new accumulated travel distance data.

The invention according to claim 8 is the same as that of FIG.
Explaining with reference to (a), the traveling distance in an electronic odometer provided with a nonvolatile storage device that calculates the traveling distance from the distance pulse, displays the traveling distance and the accumulated traveling distance, and stores the accumulated traveling distance. In the writing method, the traveling distance writing device 10 sets the accumulated traveling distance data, and
The mileage data stored in the non-volatile storage device 8a is read out, and the subtraction means 10c subtracts and adds a value corresponding to the mileage data stored in the non-volatile storage device 8a from the integrated mileage data. A mileage writing method characterized in that a mileage value is calculated, the added mileage value is transferred to the electronic odometer 8, and the accumulated mileage data is set in the nonvolatile memory device 8a. This is a writing method in which new accumulated travel distance data is written in a short time.

The invention according to claim 9 is the same as that shown in FIG.
Explaining with reference to (b), the traveling distance in an electronic odometer provided with a non-volatile storage device for calculating the traveling distance from the distance pulse, displaying the traveling distance and the accumulated traveling distance, and storing the accumulated traveling distance. 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 cumulative traveling distance data from the storage means 8e and the traveling distance data from the reading means 8b are input to the subtracting means 8d to calculate the additional traveling distance data, and the additional traveling distance data is written into the nonvolatile means via the writing means 8c. This is a mileage writing method characterized by setting the written accumulated mileage data in the storage device 8a, and is a writing method such that new accumulated mileage data can be written in a short time.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Specific examples of 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 of the non-volatile storage device or failure. At that time, it is necessary to write the accumulated traveling distance data stored in the non-volatile storage device to a new non-volatile storage device. By writing the accumulated traveling distance data in a short time, workability can be improved. It is necessary and as explained above. As an embodiment thereof, an electronic odometer capable of calculating an integrated mileage by calculating processing based on integrated mileage data set by a mileage writing device, an electronic odometer calculating and processing integrated mileage data There is a mileage writing device for writing to a odometer and a mileage writing method of their accumulated mileage data.

First, an embodiment of an electronic odometer and its mileage writing device of the present invention will be described with reference to a block diagram based on FIG. In the figure, 8 is an electronic odometer, and 10 is 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 the I / F (interface) circuit 1a,
The distance pulse is calculated by the CPU 2 to generate traveling distance data, and the traveling distance data is stored in the nonvolatile storage device 4.
Will be remembered. Nonvolatile storage device (nonvolatile memory) 4
The accumulated traveling distance data stored in is temporarily stored in the RAM, the display value displayed in the accumulated traveling distance data (BCD) is converted into a 7-segment display code, and the traveling distance indicator 6 is displayed via the decoder driver 7. Is displayed.

Further, the traveling distance writing device 10 sets an integrated traveling distance value and inputs the data value to the CPU 2 via the I / F circuit 10a. As shown in FIG. 3, the mileage writing device 10 includes a CPU 11, an I / F circuit 11a, and a CRT 14, and the CPU 11 has a RO.
M12 and RAM13 are provided. The output signal of the electronic odometer 8 (accumulated mileage data) is the I / F circuit 1
It is provided with a ROM 12 which is input to the CPU 11 via 1a and in which a control program is written, and a RAM 13 in which the accumulated mileage data of the electronic odometer 8 is written. The accumulated mileage data stored in the RAM 13 is converted from the BCD code into the 7-segment display code by the decoder driver 7 and input to the mileage indicator 6.
The mileage is displayed.

Next, the transmission control procedure of FIG. 4 and FIGS.
The electronic odometer, the mileage writing device, and the mileage writing method thereof will be described with reference to the flowchart of FIG. The transmission control procedure of FIG. 4 is performed by an electronic odometer (meter) 8 and a mileage writing device (tester) 1.
The outline of the data request and the data transfer in the writing of the accumulated travel distance data between 0 and 0 is shown. FIG. 10A shows a case where the mileage writing device 10 sets an added mileage value. The mileage writing device 10 makes an external writing request to the electronic odometer 8 and the electronic odometer 8 is used. The mileage data stored in the nonvolatile memory 4 of the odometer 8 is transferred to the mileage writing device 10, and the mileage writing device 1
The added mileage value set by 0 is transferred to the electronic odometer 8.

FIG. 1B shows data transmission / reception when the additional mileage value is set by the electronic odometer 8, and the mileage writing device 10 requests the total mileage writing. The electronic odometer 8 requests the password and requests the set mileage data (new integrated mileage data) when the passwords match. That is, the mileage writing method differs depending on whether the electronic odometer 8 or the mileage writing device 10 is provided with the subtraction means for calculating the added mileage value. Hereinafter, a detailed description will be given based on the flowcharts of FIGS.

First, referring to FIGS. 5 and 6, FIG.
An operation flow for setting the additional travel distance value by the travel distance writing device 10 according to (a) will be described. FIG. 5 is an operation flow of the mileage writing device (tester).
In the figure, in step S1, the traveling distance writing device 1
An external write request is issued from 0 to the electronic odometer 8. The external write request may include the password. In step S2, in response to the write request, the current integrated travel distance data (odd value) stored in the replaced nonvolatile storage device 4 is read from the electronic odometer 8 and the CPU is read.
11 is written in the RAM 13. In step S3, it is determined whether or not the reading is performed. If the reading is not performed, the process returns to step S2, and when the reading is completed, the process proceeds to step S4. In step S4, the read accumulated traveling distance data is written in the RAM 13 and R
The integrated traveling distance 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.

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

Next, the operation flow of the electronic odometer will be described with reference to FIG. In the drawing, the integrated mileage data is written by the mileage writing device using the electronic odometer as a writing mode. Less than,
The details will be described. In the figure, step S
In step 1, it is determined whether or not there is an external writing request from the mileage writing device 10. If there is an external writing request, the electronic odometer 8 is set to the distance pulse measurement prohibited state in step S2. Then, the process proceeds to step S3, and the nonvolatile storage device 4
The current accumulated traveling distance data (odd data) stored in the memory is read and transmitted to the traveling distance writing device 10. In step S4, it is determined whether the transmission is completed, and the process proceeds to step S5. In step S5, the mileage writing device 10
The added mileage value (addition data) transmitted from the electronic odometer 8 is received. In step S6,
It is determined whether or not the addition data is received, and if the reception is not completed, the process returns to step S5. When the reception of the addition data is completed, the process proceeds to step S7. In step S7, the addition data is written in the non-volatile storage device 4, and the accumulated traveling distance data (odd data) is set as new accumulated traveling distance 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 prohibited state of the electronic odometer 8 is released, and the distance pulse from the distance sensor 1 is input to set the measurement permitted state.

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

Next, with reference to FIG. 7, an example of a mileage writing method using an electronic odometer will be described. 6 is a flow chart for transferring the accumulated traveling distance data to an electronic odometer and setting a new accumulated traveling distance value in response to a writing request from the traveling distance writing device 10. FIG. 7 shows that the electronic odometer is set to the writing mode in response to a writing request from the mileage writing device 10 and the accumulated mileage value is written. Hereinafter, a detailed description will be given with reference to FIG. 7.

In the figure, in step S1, when the traveling distance writing device 10 requests the electronic traveling distance meter 8 to write the accumulated traveling distance, the operation 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. These steps S2 and S3 are devised so that a specific operator can write in the data in order to prevent falsification of the accumulated travel distance data. If the passwords match, the process proceeds to step S4, and the input of the distance pulse from the distance sensor 1 is prohibited. continue,
In step S5, the traveling distance data stored in the exchanged current non-volatile storage device 4 is read into the RAM of the CPU 2, and the process proceeds to step S6. In the current writing in the non-volatile storage device 4, several kinds of mileage data are written in advance, the one close to the integrated mileage data to be set is selected, and the deficient integrated mileage data is written. 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 traveling distance writing device 10
When the set accumulated travel distance data is input from, the process proceeds to step S8. In step S8, the integrated traveling distance data stored in the RAM is read out, the traveling distance data stored in the non-volatile storage device is read out, and the traveling distance data is calculated from the accumulated traveling distance data by the subtracting means. To calculate the added mileage value. continue,
In step S9, the added traveling distance value is written so as to be added to the traveling distance data stored in the nonvolatile storage device 4, and is displayed on the traveling distance writing device 6. In step S10, distance pulse measurement is permitted. Distance pulse is CP
It is input to U2, the travel distance is measured by the distance pulse, and the integration of the travel distance is started.

The nonvolatile memory device 4 will be described below. The CPU 2 controls the distance counter 2 as shown in FIG.
a, a ROM 2b, and a RAM 2c, and the RAM 2c includes an address pointer 2 ₁ and traveling distance storage areas 2 ₂ to 2 ₄ . The nonvolatile storage device 4 is connected to the CPU 2. A control program is written in the ROM 2b, a RAM 2c for storing various data generated in the operation process, an address pointer 2 ₁ for designating an address for recording the data, a distance counter 2a for counting a distance pulse from the distance sensor 1 and its distance. There are provided mileage storage areas 2 ₂ to 2 _{4 for} recording data.

As shown in FIG. 9, the non-volatile memory device 4 is composed of 128 × 8 bits, and has a range of 0 to 1 as shown in FIG.
Up to 24, the address area 4a and the counter area 4b are formed. Writing of vehicle mileage data is shown in FIG.
As shown in (a), "FF" is first recorded in hexadecimal in the address area 4a. In this state, the address pointer 2 ₁ points to the address 0. After that, when the vehicle starts traveling and the vehicle travels a predetermined distance by the distance pulse from the distance sensor 1, for example, 1 km, it is currently stored in the address 0 indicated by the address pointer 2 ₁ as shown in FIG. 9B. To the existing data "FF"
Add 1 to make "00". Further, when the vehicle travels 2 km, as shown in FIG. 9B, the address pointer 2
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 in the address 0.
Is incremented by 1 to give “01”. The mileage is 32
At 000 km, "FF" in hexadecimal number and "1111, 1111" in binary number are recorded in the final address 124, and +1 is added to hexadecimal "FF" in all the counters 1 to 3 to obtain "00". Become. When the 1 km traveling distance is counted, the address pointer 0 becomes "01".

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

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

When the electronic odometer fails,
If only the non-volatile storage device is abnormal, if the accumulated traveling distance data is recorded in the RAM of the CPU provided in the electronic odometer, the accumulated traveling distance data is read by the traveling distance writing device, Based on the accumulated traveling distance data, the traveling distance added may be written by the traveling distance writing device into the nonvolatile storage device in which predetermined traveling distance data is stored.

Further, for the purpose of preventing falsification of the integrated mileage data of the electronic odometer, even if the subtraction data is input, a protector is provided so as not to accept it. In addition, unless a password is provided and the passwords do not match, the writing mode of the new accumulated mileage data is prevented from being opened, and
The calculation in the minus direction is impossible, and the traveling distance can be added only in the plus direction to prevent falsification of the accumulated traveling distance.

Further, according to the present invention, it is possible to write the integrated traveling distance value of the electronic odometer without necessarily providing a writing device. For example, an electronic odometer is provided with an odd trip switch (a switch for setting an accumulated mileage value), and the od trip switch is used to set a new accumulated mileage value, and the CPU in the electronic odometer is set. Can be input to set a new cumulative mileage. That is, the writing device of the above embodiment is not limited to the one provided separately from the electronic odometer, and may include the one provided with the odd trip switch to the electronic odometer.

[0035]

As described above, the electronic odometer of the present invention has a writing mode by the mileage writing device in addition to the writing mode of the mileage by the distance pulse. There is an advantage that the accumulated traveling distance data can be reset by the distance writing device. Therefore, it is possible to automate the writing of the integrated mileage data on the electronic odometer, and at the same time, it is possible to reduce the burden on the operator who writes the integrated mileage data.
There is an advantage that the integrated traveling distance can be set in a short time.

Further, the electronic odometer of the present invention is provided with a writing mode in addition to the mode in which the pulse is input from the distance sensor and the mileage is measured. The control program for this writing mode is opened to write the accumulated mileage data, and the non-volatile memory device of the exchanged electronic odometer in which the mileage value has been written in advance is replaced. By writing the difference traveled distance value, there is an advantage that a new integrated traveled distance can be written in a short time.

Further, in the mileage writing device of the present invention, the mileage value stored in the non-volatile memory device is read from the electronic odometer and written in the mileage writing device, and the mileage writing device subtracts. There is an advantage that the difference mileage value is calculated by the means and the difference mileage value is written in the non-volatile storage device of the electronic odometer so as to be written in a short time.

[Brief description of 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 an embodiment of a mileage writing device according to the present invention.

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

FIG. 5 is a diagram showing a flowchart for explaining the operation of the mileage writing device.

FIG. 6 is a diagram showing a flowchart for explaining the operation of the electronic odometer.

FIG. 7 is a diagram showing a flowchart for explaining 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 mileage display device.

11 is a diagram showing a flowchart showing an operation of the mileage display device of FIG.

[Explanation of symbols]

 1 Distance Sensor 2,11 CPU 4 Nonvolatile Storage Device 5 Odometer Display 6 Odometer 7 Decoder Driver 8 Electronic Odometer 10 Odometer Writing Device 1a, 10a, 11a Interface Circuit 12 ROM 13 RAM 14 CRT

Claims (9)

[Claims] 1. An electronic odometer equipped with a non-volatile memory device for calculating a mileage from a distance pulse, displaying the mileage and an accumulated mileage, and storing the accumulated mileage, which is newly set. A value corresponding to the traveling distance data stored in the nonvolatile storage device is subtracted from the accumulated traveling distance data by the subtracting means, and the added traveling distance value obtained by the subtracting means is written in the nonvolatile storage device. An electronic odometer characterized by distance data. 2. An electronic odometer provided with a non-volatile storage device for calculating a travel distance from a distance pulse, displaying the travel distance and the total travel distance, and storing the total travel distance, wherein the non-volatile memory is used. Addition travel obtained by reading the travel distance data stored in the device, transferring it to the travel distance writing device, and subtracting a value corresponding to the travel distance data from the integrated travel distance data set by the travel distance writing device. An electronic odometer, which receives a distance value and writes it in the nonvolatile storage device by a writing means to obtain integrated mileage data. 3. An electronic odometer equipped with a non-volatile storage device for calculating a mileage from a distance pulse, displaying the mileage and an integrated mileage, and storing the integrated mileage, in which the mileage is written. 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 non-volatile storage device is subtracted from the mileage data by subtraction means, and the subtraction is performed. An electronic odometer, comprising: writing means for writing the added mileage value obtained from the means to the nonvolatile memory device as integrated mileage data. 4. An electronic odometer equipped with a non-volatile storage device for calculating a mileage from a distance pulse, displaying the mileage and an accumulated mileage, and storing the accumulated mileage. The stored non-volatile storage device, a reading means for reading the travel distance data of the non-volatile storage device in response to an external write request by the travel distance writing device, and the accumulated travel distance data set by the travel distance writing device. And a writing unit that writes the added travel distance value obtained by subtracting a value corresponding to the travel distance data stored in the nonvolatile storage device read by the reading unit from the storage unit to the nonvolatile storage device. Then, the electronic device is characterized in that the writing of the traveling distance calculated from the distance pulse based on the accumulated traveling distance data written in the nonvolatile storage device is started. Odometer. 5. An electronic odometer equipped with a non-volatile storage device for calculating a mileage from a distance pulse, displaying the mileage and an accumulated mileage, and storing the accumulated mileage, in which mileage data is stored. A stored non-volatile storage device, a reading means for reading the travel distance data of the non-volatile storage device in response to a request for writing the accumulated travel distance data set by the travel distance writing device; Subtracting means for subtracting a value corresponding to the traveling distance data read by the reading means from the integrated traveling distance data, and writing means for writing the added traveling distance value obtained by the subtracting means in the non-volatile storage device. And starting writing of the travel distance calculated from the distance pulse based on the accumulated travel distance data written in the nonvolatile memory device. Electronic odometer according to claim. 6. A mileage writing device for an electronic odometer, comprising a non-volatile storage device for calculating a mileage from a distance pulse, displaying the mileage and an integrated mileage, and storing the integrated mileage. The storage means for reading and storing the traveled distance data written in the nonvolatile storage device, the traveled distance setting means for setting the accumulated traveled distance data, and the accumulated traveled distance data set by the traveled distance setting means for storing the traveled distance data. And a subtraction means for subtracting a value corresponding to the travel distance data written in the storage means, and the added travel distance value obtained from the subtraction means is transferred to the electronic odometer. Device. 7. A mileage writing method in an electronic odometer equipped with a non-volatile storage device for calculating a mileage from a distance pulse, displaying the mileage and an accumulated mileage, and storing the accumulated mileage. The mileage data stored in the non-volatile storage device is read, and a value corresponding to the set total mileage data and the mileage data read from the non-volatile storage device is calculated by the subtracting means, and the subtraction is performed. A mileage writing method, wherein the added mileage value calculated by the means is written in the nonvolatile storage device to set integrated mileage data. 8. A mileage writing method in an electronic odometer equipped with a non-volatile storage device for calculating a mileage from a distance pulse, displaying the mileage and an accumulated mileage, and storing the accumulated mileage. The traveling distance writing device sets the accumulated traveling distance data, reads the traveling distance data stored in the nonvolatile storage device, and stores the accumulated traveling distance data in the nonvolatile storage device by the subtracting means. The added mileage value is calculated by subtracting a value corresponding to the mileage data, the added mileage value is transferred to the electronic odometer, and the accumulated mileage data is set in the nonvolatile storage device. A mileage writing method characterized by the above. 9. A mileage writing method in an electronic odometer equipped with a non-volatile storage device for calculating a mileage from a distance pulse, displaying the mileage and an accumulated mileage, and storing the accumulated mileage. In addition, the added mileage data set by the mileage writing device is transferred to the electronic odometer and stored in the storage means,
The accumulated traveling distance data from the storage means and the traveling distance data from the reading means are input to the subtracting means to calculate added traveling distance data, and the added traveling distance data is written to the nonvolatile storage device via the writing means. A mileage writing method characterized by setting cumulative mileage data.