JP2000136935A - Device for displaying traveling location - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for displaying the travelling location capable of facilitating malfunction analysis by storing the various commands, data, status as log data and performing analysis through the use of the stored log data in the case of the occurrence of errors. SOLUTION: This display device is provided with a means 10 for enabling commands for reading map data corresponding to the location of one's own vehicle for the first storage means CD-ROM 7 and displaying it on a display 21, read data, and status indicating the results of reading to be stored in the second storage means D-RAM 12 each as log data, the log data from the second storage means 12 to be transferred to the third storage means S-RAM 13 to acquire it in the case of the occurrence of errors in reading data, and the causes of the errors to be analyzed on the basis of the log data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a travel position display device (navigation device) for displaying the current position of a vehicle together with a map. More specifically, the present invention relates to a technology for storing commands, data, and status contents with a CD-ROM drive mounted on the traveling position display device.

[0002]

2. Description of the Related Art FIG. 6 is a block diagram showing the outline of a vehicle-mounted traveling position display device. In FIG. 6, 1
Is a direction sensor. The direction sensor 1 uses a geomagnetic sensor for detecting the absolute running direction of the vehicle and an optical gyro for detecting the relative running direction of the vehicle. 2 is a distance sensor that generates a pulse according to the rotation speed of the wheel, 3 is an on / off signal of a brake switch, a parking switch, and the like,
This is a vehicle sensor signal such as a power supply voltage monitoring signal. Reference numeral 4 denotes a sensor signal processing unit for processing sensor signals of the azimuth sensor 1, the distance sensor 2, and the like, and 5 denotes a GPS (Global Positioning System).
This GPS receiver 5 can obtain the position (latitude, longitude) of a receiving point by receiving and calculating radio waves transmitted from a plurality of satellites. Reference numeral 6 denotes a CD-ROM driver. This CD-R
The OM driver 6 is a CD-RO on which map data is recorded.
It reads out map data from M7, and performs voice reproduction of voice guidance and the like. Then, at the time of voice reproduction of voice guidance and the like, it is output from the speaker 20 via the voice processor 19.

Next, the configuration of the apparatus main body 9 of the traveling position display device will be described. 10 is a CPU for performing various calculations
(Central processing unit), 11 is a program RO in which various arithmetic programs for processing by the CPU 10 are stored.
M (read only memory), 12 is a memory (D-RAM) for storing data from the azimuth sensor 1, the distance sensor 2, the GPS receiver 5, the CD-ROM drive 6, etc., the calculation result of the CPU 10, etc. A backup memory (S-RAM) for holding necessary data even when the power supply to the power supply 9 is stopped, and 14 is a memory (font ROM) in which patterns such as character symbols to be displayed on a display are stored. , 15 is an image processor for forming a display image based on map data, current position data of the own vehicle, etc., 16 is map data output from the CPU 10, current position data and kanji, a town name output from the font ROM 14, Memory (V-RAM) for storing images to be displayed on the display (CRT) 21 by combining kanji and fonts for roads and the like 17 is a RGB conversion circuit for converting the output data of the V-RAM 16 into color signals, RG color signals from the RGB conversion circuit 17 on the display 21
It is output as a B video signal 8. Reference numeral 18 denotes an ATAPI interface.

In this travel position display device, when reading map data from the CD-ROM 7, the ATAPI
Access is provided through interface 18. C
The data read from the D-ROM 7 is stored in the D-RAM 12 and is displayed by the image processor 15 on the display RGB.
Video signal. Here, the traveling position display device 9
Then, if the data from the CD-ROM 7 is normally read out, it can be displayed as a map.

However, if an error occurs during reading, error processing is performed. This is usually a retry process or the like. If the error is not recovered even after executing this error processing, information that the error has occurred is stored in the S-RAM 13 together with the time of occurrence, and the cause of the failure is analyzed based on the error information. is there.

[0006]

In the above-described conventional apparatus, when an error occurs between the traveling position display device and the CD-ROM 7, error information is stored in the S-RAM 13 and the stored error is stored. Failure analysis was performed by looking at the information. However, when performing a failure analysis, it is difficult to find the cause only by looking at the error information.

The present invention has been made in view of the above-described problem, and stores various commands, data, and statuses as log data, and uses the stored log data when an error occurs. It is an object of the present invention to provide a traveling position display device that can analyze a failure easily by analyzing the traveling position.

[0008]

In order to achieve the above object, the present invention provides a command for reading map data corresponding to the position of a vehicle and displaying the map data on a display means, a read data, and a status indicating the read result. Are respectively stored as log data, and when an error occurs in reading the data, the log data is acquired, and the cause of the error can be analyzed based on the log data.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention according to claim 1 of the present invention provides a command for reading map data corresponding to the position of a vehicle and displaying the map data on a display means, a read data, and a status indicating the read result. A travel position display device which is stored as log data and further includes means for acquiring the log data when an error occurs in reading the data. In this device, when a data reading error occurs, stored log data can be acquired, and the cause of the error can be analyzed based on the log data, thereby facilitating failure analysis. Has an action.

According to a second aspect of the present invention, log data is stored in a D-RAM, and when an error occurs, the log data stored in the D-RAM is stored in the S-RAM.
2. The travel position display device according to claim 1, wherein the log data is transferred to a RAM, and the log data has a backup memory function capable of retaining necessary data even after the power supply is stopped. -Since it is stored in RAM,
This has the effect that even if the power supply is stopped, the data can be retained without disappearing.

According to a third aspect of the present invention, there is provided the travel position display device according to the first or second aspect, wherein the map data is stored in a CD-ROM. CD-ROM because it is stored in ROM
Has the effect that a large amount of data can be retained for each purpose by exchanging the.

According to a fourth aspect of the present invention, there is provided a reading means for reading map data for a vehicle position detected by the vehicle position detecting means from a first storage means, and the read map data. Display means for displaying a map on the basis of the vehicle position detected by the vehicle position detection means on the map, a command for reading the map data from the first storage means, A second storage unit for storing the map data read from the first storage unit and a status indicating the read result as log data, respectively, when an error occurs while reading the map data by the reading unit, Means for acquiring the log data at the time of occurrence of an error from the second storage means. In this device, when a data reading error occurs, stored log data can be acquired, and the cause of the error can be analyzed based on the log data, thereby facilitating failure analysis. Has an action.

The invention according to claim 5 of the present invention further comprises third storage means having a backup function, wherein the control means reads log data at the time of occurrence of an error from the second storage means, The travel position display device according to claim 4, wherein the travel position display device is transferred to the third storage means and stored. In this device, even when the power supply to the log data is stopped, the necessary data is retained in the third storage unit having the backup function, and thus the data can be protected.

(Embodiment 1) Hereinafter, a traveling position display device according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a configuration block diagram showing an outline of a traveling position display device in the present embodiment,
The same reference numerals as those shown in FIG. 6 indicate the same members. In FIG. 1, reference numeral 1 denotes a direction sensor.
A geomagnetic sensor for detecting the absolute running direction of the vehicle and an optical gyro for detecting the relative running direction of the vehicle are used. Reference numeral 2 denotes a distance sensor that generates a pulse corresponding to the number of rotations of a wheel to detect a traveling distance, and 3 denotes an ON / OFF signal of a brake switch, a parking switch, and the like. Vehicle signal. Reference numeral 4 denotes a sensor signal processing unit for processing sensor signals of the azimuth sensor 1, the distance sensor 2, and the like.
The GPS receiver 5 receives radio waves transmitted from a plurality of satellites and performs calculations to obtain the position (latitude,
Longitude). 6 is CD-R
OM drive. This CD-ROM drive 6
CD-ROM as storage means in which map data is recorded
7 for reading map data from the computer 7 and playing music for voice guidance. Then, the music reproduction of the voice guidance is output from the speaker 20 via the voice processor 19.

Next, the configuration of the apparatus main body 9 of the traveling position display device will be described. Reference numeral 10 denotes a CPU (central processing unit) as a main control unit that performs various calculations and controls the entire apparatus.
Reference numeral 21 denotes a program ROM (read-only memory) as storage means in which programs for various calculations performed by the CPU 10 are stored, and 12 denotes an azimuth sensor 1, a distance sensor 2,
A memory (D-RAM) as a storage means for storing data from the PS receiver 5, the CD-ROM drive 6, etc., the calculation results in the CPU 10, and the like, 13 is necessary even when power supply to the apparatus main body 9 is stopped. Backup memory (S-RA) as storage means for holding
M) and 14 are displays (CRT) as display means
Reference numeral 21 denotes a memory (font ROM) in which patterns of characters and symbols to be displayed are stored, 15 denotes an image processor for forming a display image based on map data, current position data of the vehicle, and the like; 16 denotes an output from the CPU 10 A memory (V-RAM) as storage means for storing an image to be displayed on the display 21 by synthesizing the map data current position data and kanji, kanji such as a street name and a road outputted from the font ROM 14, and a font; This is an RGB conversion circuit for converting the output data of the V-RAM 16 into a color signal.
Are output as RGB video signals 8. 18 is ATA
It is a PI interface.

In this travel position display device, when the map data is read from the CD-ROM 7, the ATAPI
Access is provided through interface 18. C
The data read from the D-ROM 7 is stored in the D-RAM 12 and is displayed by the image processor 15 on the display RGB.
Of the audio processor 1
9 is converted into an audio signal. Here, in the travel position display device 9, if the data from the CD-ROM 7 is normally read out, the data is displayed as a map, and necessary voice is uttered through the speaker 20.

FIG. 2 is a flowchart showing an example of the operation process of the CPU 10 in the present embodiment. In the operation processing flow of FIG. 2, when a read request is issued from the traveling position display device to the CD-ROM drive 6 (step S1), the read command is recorded in the D-RAM 12 (step S2). Then, a read command is issued to the ATAPI interface 18 (step S).
3) Send a read command to the CD-ROM drive 6. Then, the process waits until the read is completed (step S4). When the reading is completed, the status as the transmission result is read (step S5), and the status is recorded in the D-RAM 12 after recording the read command and the read data (step S6).

If the status as the transmission result is normal, the transmission process ends (step S7). On the other hand, if the read command, read data, and status at the time of performing the transmission process are abnormal, it is determined that a transmission error has occurred, and the log data that has been recorded in the D-RAM 12 is stored in the D-RAM 12 by the -Transfer to RAM 13 (step S8). By transferring the log data to the S-RAM 13, the log data at the time of occurrence of the error is backed up, and this data can be read out later. As a result, it becomes possible to easily perform the work of failure analysis when a transmission error occurs.

FIG. 3 is an operation timing chart showing an example of a sequence when an error occurs between the traveling position display device and the CD-ROM drive 6. In the sequence, a read command (read request) is sent from the CPU 10 of the travel position display device to the CD-ROM drive 6, and the data is transmitted from the CD-ROM drive 6 to the CPU of the travel position display device.
10 and then the CD-ROM drive 6
Sends a status as a transmission result to the CPU 10 of the traveling position display device. This exchange of signals is repeated.

FIG. 4 is a data configuration diagram showing an example of log data recorded in the D-RAM 12 of the CPU 10 of the traveling position display device by exchanging signals in FIG. The recorded log data includes commands, read data,
The content determination result of the status is recorded as an example.

FIG. 5 is a diagram showing that log data was transferred from the D-RAM 12 to the S-RAM 13 when a transmission error occurred in the traveling position display device. Here, exactly the same contents as the D-RAM 12 are transferred to the S-RAM 13. As a result, the log data immediately before the occurrence of the transmission error is stored in the S-RAM 13, and the failure analysis work can be facilitated. S-RAM 13 here
Has a backup memory function that can hold necessary data even when the power supply to the apparatus main body 9 is stopped, so that the power supply to the apparatus main body 9 is cut off, for example. However, the transferred log data can be retained without being lost.

As described above, according to the present embodiment, the S-RA
By looking at the log data stored in M13 later, it is possible to facilitate the failure analysis.

Note that, unlike the above embodiment, the log data is not transferred to the S-RAM 13 and the CPU 10 quickly stores the log data at the time of occurrence of the error after the error occurs. The data may be obtained directly from the RAM 12 and subjected to error analysis.

[0024]

As is clear from the above embodiment, the traveling position display device of the present invention reads commands and read data for reading map data corresponding to the position of the vehicle and displaying it on the display means. The status indicating the result is stored as log data, and when a data reading error occurs, the log data is acquired,
Since the cause of the error can be analyzed based on the log data, the failure analysis can be facilitated.

Further, since the log data is stored in the S-RAM having a backup memory function capable of holding necessary data even when the power supply is stopped, the data is stored even if the power supply is stopped. It can be kept without disappearing.

Further, since the map data is stored in the CD-ROM, a large amount of data can be handled for each purpose by exchanging the CD-ROM.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram of a traveling display device according to an embodiment of the present invention.

FIG. 2 is an operation processing flowchart of a control unit according to the embodiment of the present invention.

FIG. 3 is a diagram showing an example of a sequence when an error occurs in the embodiment of the present invention.

FIG. 4 is a diagram showing an example of log data acquired by a D-RAM according to the embodiment of the present invention.

FIG. 5 is a diagram illustrating a D-RA when an error occurs according to the embodiment of the present invention;
Diagram showing an example of transferring log data from M to S-RAM

FIG. 6 is a configuration block diagram of a conventional device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Direction sensor 2 Distance sensor 3 Vehicle signal 4 Sensor signal processing part 5 GPS receiver 6 CD-ROM drive 7 CD-ROM (first storage means) 8 RGB video signal 9 Device main body 10 CPU (central processing unit) 11 Program ROM 12 D-RAM (second storage means) 13 S-RAM 14 Font ROM 15 Image processor 16 Memory (V-RAM) 17 RGB conversion circuit 18 ATAPI interface 19 Audio processor 20 Speaker 21 Display (CRT) 22 Program ROM

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2C032 HB02 HB11 HC08 2F029 AA02 AB01 AB07 AB09 AC02 AC04 AC14 AC18 AC20 5H180 AA01 BB13 BB17 FF04 FF05 FF22 FF27 FF32

Claims (5)

[Claims] 1. A command for reading map data corresponding to a position of a vehicle and displaying the data on a display unit, read data, and a status indicating a read result are stored as log data, and the data is read. A travel position display device comprising: means for acquiring the log data when an error occurs. 2. The log data is stored in a D-RAM,
The travel position display device according to claim 1, wherein the log data stored in the D-RAM is transferred to an S-RAM when an error occurs. 3. The travel position display device according to claim 1, wherein the map data is stored in a CD-ROM. 4. A vehicle position detecting means for detecting a vehicle position, reading means for reading map data for the vehicle position detected by the vehicle position detecting means from the first storage means, Display means for displaying a map based on the map data and displaying the vehicle position detected by the vehicle position detection means on the map; and a command for reading the map data from the first storage means. And a second storage unit for storing the map data read from the first storage unit and a status indicating the read result as log data, respectively, and outputting a map data read command while the reading unit outputs the map data. Control means for acquiring the log data at the time of occurrence of an error from the second storage means when an error occurs while reading the data. Running position display device characterized by. 5. A storage device further comprising a third storage unit having a backup function, wherein the control unit reads log data at the time of occurrence of an error from the second storage unit and transfers the log data to the third storage unit. The travel position display device according to claim 4, wherein the travel position is stored.