JP2008044442A - Vehicular diagnostic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular diagnostic device capable of protecting privacy of a driver in a constitution that a traveling position history of the vehicle is periodically recorded for the purpose of failure diagnosis of the vehicle. <P>SOLUTION: A navigation device speed-corrects a traveling distance obtained from a meter and corrects it so as to become on a road of a map by map-matching. At this time, when a speed correction value is unsuitable, since an error of the map-matched movement distance at two points and a movement distance determined by operating the corresponding absolute position coordinate becomes large (step 106: NO), it is determined that it is in the position deviation state at present and a relative position history is memorized in a hard disk device (step 112 or step 114). Accordingly, a repairing worker corrects a vehicle speed correction value such that it becomes suitable when it is determined that the vehicle correction value is unsuitable based on the relative position history memorized in the hard disk device. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle diagnostic apparatus that can diagnose an abnormality of a vehicle based on a traveling position history of the vehicle.

As an apparatus for recording vehicle travel history information for vehicle failure diagnosis, there is one disclosed in Patent Document 1. In this system, traveling data such as the vehicle speed of the vehicle and traveling history are recorded, and when a failure occurs, a repair operator performs failure analysis based on the traveling history information.
JP-A-11-125584

  However, in Patent Document 1, if it is a person with specialized knowledge, information relating to the driver's privacy, such as a travel position history, can be easily extracted from the recorded information, and personal privacy protection can be achieved. Has a problem from a point of view.

  The present invention has been made in view of the above circumstances, and its purpose is for a vehicle capable of protecting a driver's privacy in a configuration in which a vehicle travel position history is periodically recorded for the purpose of vehicle failure diagnosis. It is to provide a diagnostic device.

  According to the first aspect of the present invention, when the abnormality determination means detects an abnormality of the vehicle, the current position history storage means sequentially stores the change of the current position acquired by the current position acquisition means in relative position coordinates. As a result, even if the repair operator reads the travel position history to diagnose the abnormality of the vehicle, the travel position history is stored in the relative position coordinates. The history is never read in absolute coordinates. That is, the record that can be read out is a fragmentary relative position coordinate, and the third party does not know the absolute position coordinate of the traveling position history, and can protect the privacy of the individual.

  According to the invention of claim 2, when the vehicle speed correction value for correcting the vehicle speed is inappropriate, the travel distance based on the current position acquired by the current position acquisition means and the travel distance acquired by the travel distance acquisition means Therefore, if the error exceeds a predetermined allowable range, it can be determined that a current position shift has occurred.

  According to the invention of claim 3, even if the travel position history is stored in the normal state, the travel history is encrypted. Therefore, even if the repair operator reads the travel history, the travel position is not known. Can not. In addition, when using encrypted information with the driver's consent, the absolute position coordinates at the time of the failure can be clarified, so that a wider range of failure diagnosis can be performed.

(First embodiment)
Hereinafter, a first embodiment in which the present invention is applied to a navigation apparatus will be described with reference to FIGS.
FIG. 1 is a block diagram showing the configuration of the navigation device. In FIG. 1, various in-vehicle devices such as an engine control computer 2, an air conditioner device 3, and a meter 4 are connected to the navigation device 1 through a communication line 5 and the like. The navigation device 1 performs a failure diagnosis of each of these in-vehicle devices using the function of the navigation device 1 itself. The hard disk device (corresponding to the travel position history storage means) 6 of the navigation device 1 is provided as a storage means for storing the map data 7, but since it has a large capacity, in the present invention, an empty space is used in the present invention. It also functions as auxiliary storage means for recording travel data such as vehicle speed and travel position history as vehicle travel history data 8 for failure diagnosis.

  The display device 9 comprises a liquid crystal display and displays a navigation map and the like. The switch input device 10 is for operating a navigation device such as a button switch on an operation panel, a touch switch on a screen, or a remote controller. An arithmetic control device (corresponding to current position acquisition means, abnormality determination means, travel distance acquisition means) 11 controls the central control of the navigation device 1. The semiconductor storage device 12 is composed of RAM, Flash / ROM, or the like for temporarily storing various information of the navigation device 1, and is rewritable.

  FIG. 2 shows an example of a flowchart for recording travel data such as the vehicle speed of the vehicle and travel position history by this apparatus. In this case, the navigation device 1 uses a navigation function such as map matching of the navigation device 1 itself when storing the travel position history. In step 101, the navigation device 1 collects absolute position coordinates (latitude: X, longitude: Y) calculated from GPS information and the like, and a vehicle travel distance (odometer value) S from the meter 4, and is a temporary storage area. Store in S1, X1, and Y1, respectively. Also, internal variables Xd, Yd, and F are initialized. In this case, the travel distance (odometer value) S of the vehicle is data corrected by a preset vehicle speed correction value.

  In step 102, a loop is made until the next data recording timing, for example, 5 seconds elapses. When the next data recording timing is reached, the routine proceeds to step 103, where the engine control computer 2, the air conditioner device 3, the meter 4, etc. Collect driving data. For example, the engine control computer 2 collects information such as the engine speed, the fuel injection amount, the ignition angle, the air conditioner 3 such as the set temperature, the internal air temperature, and the external air temperature, and the meter 4 collects information such as the vehicle speed.

Next, the process proceeds to step 104, where absolute position coordinates (latitude: X, longitude: Y) calculated from GPS information and the like and a vehicle travel distance (odometer value) S are collected from the meter 4, and S2, which is a temporary storage area, After storing in X2 and Y2, respectively, the process proceeds to step 105, and the values of Xd and Yd are saved in Xd1 and Yd1, respectively. At this time, the travel distance Sd obtained from the travel distance (odometer value) acquired from the meter 4 is obtained by S2-S1. Further, relative position coordinates Xd and Yd are obtained from the difference (X2-X1) and (Y2-Y1) of the corrected position coordinates obtained by map matching the absolute position coordinates on the road of the map, and the movement distance XYd between them is expressed as ( Xd ² + Yd ² ) In this case, the movement distance Sd is data corrected for vehicle speed, and the movement distance XYd is data based on absolute value coordinates.

  Here, if the reception environment such as GPS reception status, GPS antenna connection status, vehicle speed correction, etc. is appropriate and there is no current position deviation, that is, if vehicle speed correction is appropriate, the absolute value calculated from the vehicle speed information etc. Since the movement distance obtained from the position coordinates and the movement distance obtained from the travel distance (odometer value) obtained from the meter 4 should almost coincide with each other, judging whether the reception environment is appropriate based on those errors Can do.

  That is, in step 106, if the error between the travel distance Sd obtained from the travel distance (odometer value) from the vehicle speed sensor and the travel distance XYd calculated from the corrected position coordinates is smaller than a predetermined value, If it is determined that no positional deviation has occurred, the process proceeds to step 107. If it is greater than a predetermined value, it is determined that a current positional deviation has occurred and the process proceeds to step 111. Specifically, a ratio between the movement distance XYd calculated from the corrected position coordinates and the movement distance Sd obtained from the travel distance (odometer value) from the vehicle speed sensor is obtained, and the value is 0.9 to 1.1. It is determined by whether or not it is between.

  In step 107, the value of the internal variable F is F = 1 when it is determined that the current position shift has occurred at the previous recording timing, and F = 0 when it is determined that the current position shift has not occurred. If F = 1, the process proceeds to step 108, and if F = 0, the process proceeds to step 110.

  Here, when the current position shift occurs as described above, the relative position coordinates at the recording timings before and after that are also recorded. Accordingly, in step 108, since it is determined that the current position deviation has occurred at the previous recording timing, the current traveling data and the relative position coordinates Xd and Yd are simultaneously recorded with the time stamp such as the time so that the data generation timing can be known. The data is recorded in the failure diagnosis vehicle travel history data 8 of the hard disk device 6 as it is, and 0 is written in F in Step 109 and then the process proceeds to Step 116.

  In step 110, since it is determined that the current position deviation has not occurred both in the previous time and this time, the travel position history is not recorded, and the relative position coordinates Xd and Yd are set as dummy fixed values, for example, 8000 (hexadecimal). At the same time as the time stamp of the time and the like together with the travel data, it is recorded in the vehicle travel history data 8 for failure diagnosis of the hard disk device 6, and the process proceeds to Step 116.

  On the other hand, in step 111, if it is determined that the current position shift has occurred at the previous recording timing, F = 1, and if it is determined that the current position shift has not occurred, F = 0. When F = 1, the process proceeds to step 112, and when F = 0, the process proceeds to step 113. In step 112, since it is determined that the current position deviation has occurred, the hard disk device 6 is used for failure diagnosis of the hard disk device 6 as it is at the same time as the time stamp so that the travel timing and relative position coordinates Xd, Yd can be determined. The vehicle travel history data 8 is recorded and the process proceeds to step 116. In step 113, it is determined that F = 0, that is, the current position deviation has not occurred at the previous recording timing. If the current position deviation has occurred, the relative position coordinates at the preceding and subsequent recording timings are also recorded. Therefore, the previously recorded Xd and Yd are rewritten in the failure diagnosis vehicle travel history data 8 of the hard disk device 6 by the previous relative position coordinates Xd1 and Yd1. In step 114, the running data and the relative position coordinates Xd, Yd are recorded as they are in the fault diagnosis vehicle running history data 8 of the hard disk device 6 at the same time as the time stamp so that the generation timing of the data can be understood. In 115, 1 is written in F, and then the process proceeds to step 116.

In step 116, the data in the temporary storage areas S1, X1, and Y1 are rewritten with the data in S2, X2, and Y2 as reference data at the next recording timing, and the process returns to step 102.
When the current position shift occurs by the operation as described above, the vehicle travel data is stored in the failure diagnosis vehicle travel history data 8 of the hard disk device 6 in addition to the vehicle relative position coordinates.

FIG. 3 shows an example of data recorded in the failure diagnosis vehicle travel history data 8 of the hard disk device 6. In the failure diagnosis vehicle travel history data 8 of the hard disk device 6, vehicle travel data such as relative position coordinates, vehicle speed, engine speed, fuel injection amount, and ignition angle are recorded along with the time. In the recording example shown in FIG. 3, the difference between the movement distance XYd calculated from the position coordinates and the movement distance Sd obtained from the travel distance (odometer value) from the vehicle speed sensor is small and normal (normal) from time 010009 to 01035. ), And relative position coordinates Xd and Yd record a fixed value 8000 (hexadecimal). Also, the difference between XYd and Sd is small and normal (normal) after time 01036 and time 01038. However, since the difference between XYd and Sd is large at time 01037 and the current position is shifted, time 01037 and time 01036 before and after At time 01038, the relative position coordinates Xd and Yd are recorded as they are. After time 01039, fixed values 8000 (hexadecimal) are recorded as relative position coordinates Xd and Yd.
That is, when the navigation device 1 determines that a current position shift has occurred as described above, the navigation device 1 stores the travel route of the vehicle in relative position coordinates so as to include the determination period of the current position shift.

Now, it is conceivable that vehicle speed correction is inappropriate as a factor causing the current position shift.
FIG. 4 shows an example in which an example of a travel position history (relative position coordinates) when vehicle speed correction is inappropriate is represented on two-dimensional coordinates. Pattern A shows a state in which a current position shift occurs on the straight line BC indicating the relative position coordinates, and the straight lines AB and CD before and after that are also recorded. Since it is determined that there is no current position deviation on the straight line AB and the straight line CD, it is considered that the road is traced by map matching. Therefore, a line obtained by extending the straight line AB and the straight line CD (a line indicated by a broken line in FIG. 4) is considered to be on the road of the map. In the case of this pattern A, it is considered that the vehicle actually turned right at the intersection before reaching the intersection on the map. When such a pattern A occurs, the correction value of the vehicle speed sensor based on the diameter of the mounted wheel or the like is small, so it is considered that the display is shorter than the actual travel distance.
The conditions for determining the pattern A in this way are when the angle between the straight line AB and the straight line CD is between 90 ° ± 45 ° and the angle between the straight line AB and the straight line BC is 90 ° or less.

In pattern B, the actual intersection is not reached, but it is displayed that it has passed on the map, and because the correction value of the vehicle speed sensor is large, it is considered that it is displayed longer than the actual travel distance. It is done.
As a condition for determining the pattern B as described above, the angle formed by the straight line AB and the straight line CD is between 90 ° ± 45 ° and the angle formed by the straight line AB and the straight line BC is larger than 90 °.

Pattern C is a case where one parallel road is mistaken, and this is generally difficult to determine due to the road shape or the like.
As a condition for determining the pattern C as described above, the angle formed by the straight line AB and the straight line CD is within ± 45 °, and the angle formed by the straight line AB and the straight line BC is 90 ° or less.
When the current position shift as described above occurs in the navigation device 1, the user determines that some abnormality has occurred and requests the repair worker to repair.

When the repair operator is requested to repair the navigation device 1, the repair operator analyzes the vehicle diagnostic history data 8 for failure diagnosis of the hard disk device 6.
FIG. 5 shows an example of an analysis procedure for failure diagnosis for the current position shift. In step 301, the repair worker has a record of valid travel position history (valid data other than 8000 (hexadecimal) written in dummy) recorded in the fault diagnosis vehicle travel history data 8 of the hard disk device 6. Search for. In step 302, if there is no valid travel position history record, the process proceeds to step 303 and it is determined that there is no abnormality. If there is a valid travel position history record, the process proceeds to step 304, and GPS information before and after the time at which the travel position history is recorded is read. Proceeding to step 305, it is determined whether or not the GPS reception level is normal before and after the time when the travel position history is recorded. If not normal, the process proceeds to step 306, where it is determined whether the abnormality continues continuously or occurs temporarily. In the case of a temporary abnormality, the process proceeds to step 307, where it is estimated that a reception failure occurs in the shade of the building or in a tunnel. When continuing continuously, it progresses to step 308, and it is estimated that the GPS antenna, the wire harness, and the connector are defective, and the inspection is performed.

  In step 305, if the GPS reception level is normal before and after the time when the travel position history is recorded, the process proceeds to step 309, and the shape of the travel position history (relative position coordinates) on the two-dimensional coordinates is shown in FIG. It is determined whether it corresponds to pattern A of No. 4. When it corresponds to the pattern A, the process proceeds to step 310, and it is determined that the vehicle speed correction value is small. If it does not correspond to the pattern A, the process proceeds to step 311 to determine whether the shape on the two-dimensional coordinates of the travel position history (relative position coordinates) corresponds to the pattern B in FIG. When it corresponds to the pattern B, it progresses to step 312, and it determines with a vehicle speed correction value being large. If it does not correspond to the pattern B, the process proceeds to step 313, and it is determined whether or not the shape on the two-dimensional coordinates of the traveling position history (relative position coordinates) corresponds to the pattern C in FIG. When it corresponds to the pattern C, it progresses to step 314 and it determines with there being no abnormality (ability level).

  On the other hand, if none of the above determinations are true, the process proceeds to step 315, where it can be estimated that the vehicle travels on a new road that is not registered in the map data. Therefore, although it is necessary to clarify the place where the vehicle traveled with the cooperation of the driver, the cause of the current position deviation can be estimated except for special cases by recording only the relative position coordinates as described above.

According to such an embodiment, the current position deviation is determined based on the comparison between the movement distance obtained from the absolute position coordinates calculated from the GPS information and the like and the movement distance obtained from the travel distance of the vehicle obtained from the meter 4. In this case, since the relative position coordinates are stored as the travel position history of the vehicle, unlike the conventional example in which the travel position history is stored as the absolute position coordinates, the record that can be read out is the fragmented relative position coordinates. Yes, a third party does not know the absolute position coordinates of the running position history, and can protect the privacy of the individual.
In addition, since the configuration that exhibits such excellent effects can be implemented only by changing the program, the navigation device 1 can be implemented at a low cost without significant modification.

(Second embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS.
In the first embodiment, the running data is not recorded in the normal state where no current position deviation occurs. However, only the absolute position coordinates can be encrypted and recorded so as not to be understood by a third party. . In this case, since a vehicle repair worker can freely view information other than the encrypted information, a failure diagnosis can be performed using them.
In addition, if the information that is encrypted with the driver's consent is used, the absolute position coordinates at the time of the failure can be clarified, so a wider range of failures such as when driving on a new road that is not registered in the map data. Diagnosis can be made.

  FIG. 6 is a block diagram showing a system configuration. The system configuration diagram of FIG. 6 is the same as FIG. 1 except that an encryption area 8a is added to the failure diagnosis vehicle travel history data 8 of the hard disk device 6.

  FIG. 7 is an example of a flowchart for recording travel data such as the vehicle speed of the vehicle and travel position history, and is basically the same as FIG. 2 of the first embodiment. In step 201, the navigation device 1 collects absolute position coordinates (latitude: X, longitude: Y) calculated from GPS information and the like, and a vehicle travel distance (odometer value) S from the meter 4, and is a temporary storage area. Store in S1, X1, and Y1, respectively. In step 202, the absolute position coordinates X1 and Y1 are recorded in the encryption area 8a of the failure diagnosis vehicle travel history data 8 of the hard disk device 6 at the same time as the time stamp. This data cannot be viewed by a third party who does not have an encryption key. Step 203 and the subsequent steps differ from FIG. 2 only in the writing step to the hard disk device 6.

  That is, in step 211, since it is determined that no current position deviation has occurred, the relative position coordinates Xd, Yd are added to the encryption area 8a of the failure diagnosis vehicle travel history data 8 of the hard disk device 6 at the same time as the time stamp. Record. This data cannot be viewed by a third party who does not have an encryption key. In addition to the encrypted area, the relative position coordinates Xd and Yd are recorded as fixed values, for example, 8000 (hexadecimal), together with the vehicle travel data, at the same time as the time stamp such as the time. In step 209, step 213, step 214, and step 215, since it is determined that a current position shift has occurred, or because it is a recording step of relative position coordinates before and after that, vehicle travel history data 8 for failure diagnosis of the hard disk device 6. Are recorded in areas other than the encrypted area 8a.

The analysis procedure for failure diagnosis is the same as that in the first embodiment when information other than encrypted information is used (see FIG. 5).
However, when using encrypted information with the driver's consent, the absolute position coordinates at the time of the failure can be clarified, so that a wider range of failure diagnosis can be performed. For example, it can be clarified that the current position shift is a new road that is not registered in the map data. Also, in fault diagnosis other than current position shift, for example, if communication abnormality with engine control computer or air conditioner occurs in a specific place, if that place is near a radio wave transmission facility or power facility, those facilities It can be estimated that the effect of electrical noise from

The present invention is not limited to the above embodiments, and can be modified or expanded as follows.
In this embodiment, the determination of the current position deviation is made when the difference between the movement distance obtained from the travel distance (odometer value) from the meter 4 and the movement distance calculated from the absolute position coordinates is larger than a predetermined value. However, more accurate determination can be made if the distance traveled on the map screen is not the travel distance (straight line distance) calculated from the position coordinates.
By notifying the user of the diagnosis result of the vehicle speed correction, the user may be able to correct the vehicle speed correction value.

The functional block diagram which shows the electrical constitution of the navigation apparatus in 1st Example of this invention. Flow chart showing operation of navigation device The figure which shows an example of the recording data of a hard-disk apparatus The figure which shows an example of the driving position history when vehicle speed correction is inappropriate Flow chart showing an example of analysis procedure for fault diagnosis for current position shift FIG. 1 equivalent view showing a second embodiment of the present invention. 2 equivalent diagram

Explanation of symbols

  In the drawings, 1 is a navigation device, 6 is a hard disk device (traveling position history storage means), and 11 is a calculation control means (current position acquisition means, abnormality determination means, travel distance acquisition means).

Claims (3)

Current position acquisition means for acquiring the current position of the vehicle every predetermined period;
Traveling position history storage means for storing a traveling position history of the vehicle;
An abnormality determining means for determining an abnormality of the vehicle,
The travel position history storage means does not normally store the travel position history, and when the abnormality determination means determines that the vehicle is abnormal, the current position acquisition means acquires it during the determination period. The vehicle diagnostic apparatus is characterized in that the changes in the current position are sequentially stored in relative position coordinates. A travel distance acquisition means for acquiring a travel distance from the vehicle side;
The abnormality determination unit determines the current position when an error between a movement distance based on the current position acquired by the current position acquisition unit and a movement distance based on the travel distance acquired by the travel distance acquisition unit exceeds a predetermined allowable range. The vehicle diagnostic apparatus according to claim 1, wherein it is determined that a deviation has occurred.   3. The vehicle diagnostic apparatus according to claim 1, wherein the traveling position history storage means encrypts and stores the traveling position history in place of not storing the traveling position history.

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