JP5093473B2 - Vehicle failure detection device - Google Patents

Description

  The present invention relates to a vehicle failure detection device, and more specifically, even if the failure determination time is long, the level of the state detection signal immediately before and after the occurrence of the abnormality can be reliably stored, thereby enabling accurate The present invention relates to a vehicle failure detection device that enables vehicle failure diagnosis.

Hereinafter, a conventional vehicle failure detection apparatus will be described with reference to the drawings.
FIG. 8 is a block diagram showing a configuration of a conventional vehicle failure detection apparatus. FIG. 9 is a diagram showing how the conventional vehicle failure detection device stores the level of the signal input from the sensor, and is a diagram showing a case where the failure determination time is short. FIG. 10 is a flowchart showing the operation of the conventional vehicle failure detection apparatus. FIG. 11 is a diagram showing how the conventional vehicle failure detection apparatus stores the level of the signal input from the sensor, and is a diagram showing a case where the failure determination time is long.

  Conventionally, as a device for detecting a vehicle failure, as shown in FIG. 8, a sensor 32, a temporary storage unit 33, a level determination unit 34, a failure determination unit 36, a main storage unit 35, and a storage management unit 38. A vehicle failure detection device 31 is proposed.

  The sensor 32 detects the state of the vehicle component and outputs a state detection signal 39 (see FIGS. 8 and 9). Examples of the state detection signal 39 include a signal indicating the coolant temperature, the engine speed, and the battery voltage. In the example shown in FIG. 8, the sensor 32 is provided for each vehicle component.

  The temporary storage unit 33 temporarily stores the level of the state detection signal 39 periodically. The temporary storage unit 3 is a RAM such as a circular buffer. In the example shown in FIG. 9, the temporary storage unit 33 has storage areas a, b, c, d, e, and f, and stores data using a first-in first-out method. In the example shown in FIG. 9, the temporary storage unit 33 stores the level of the detection signal 39 input from each sensor 32 at the same time as a set. A set of detection signal levels at each time is stored in storage areas a, b, c, d, e, and f, respectively.

  The level determination unit 34 determines whether the level of the state detection signal 39 is in a normal region or an abnormal region.

  The failure determination unit 36 continues the abnormal region level of the state detection signal 39 from the time t1 (see FIG. 9) when the state detection signal 39 enters the abnormal region from the normal region to the time t2 when the failure determination time T elapses. If it is, it is determined that a failure has occurred.

  The main storage unit 35 is a ROM capable of erasing, appending, and rewriting data, such as PROM, EPROM, and EEPROM. The storage unit 35 has storage areas A, B, C, and D in the example shown in FIG. When it is determined that a failure has occurred, the storage unit 35 determines the level of the state detection signal 39 immediately before the time point t2 when the failure determination time T has elapsed and the level of the state detection signal 39 immediately after the time point t2. The temporary storage unit 33 is copied and stored. In the example illustrated in FIG. 9, the main storage unit 35 stores the level of the detection signal 39 input by the temporary storage unit 33 from each sensor 32 at the same time as a set.

  In addition, in the example shown in FIG. 9, the main storage unit 35 stores the level of the state detection signal 39 immediately before the time point t 2, the level of the state detection signal 39 immediately before the time point t 2, and the time point The level of the state detection signal 39 immediately after t2 is copied from the temporary storage unit 33 and stored in the main storage. In the example shown in FIG. 9, the data stored in the storage areas c, d, e, and f of the temporary storage unit 33 are stored in the storage areas A, B, C, and D of the main storage unit 35, respectively. .

  The operation of the vehicle failure detection device 31 will be described with reference to FIGS.

  First, the state detection signal 39 is input from the sensor 32 to the level determination unit 34 (step S1 in FIG. 10).

  Next, the temporary storage unit 33 periodically temporarily stores the level of the state detection signal 39 (step S2).

  The level determination unit 34 determines whether the level of the state detection signal 39 output from the sensor 32 is in a normal region or an abnormal region (step S3).

  Next, the level determination unit 34 determines whether the level of the state detection signal 39 output from the sensor 32 is in a normal region or an abnormal region (step S3).

  When it is determined that the level of the state detection signal 39 is in the normal range, the process returns to step 1. On the other hand, when it is determined that the level of the state detection signal 39 is in the abnormal region, the failure determination unit 36 determines whether the predetermined failure determination time T has elapsed while the level of the state detection signal 39 is in the abnormal region. Then, it is determined whether or not a failure has occurred (step S4).

  When it is determined that the failure determination time T has elapsed, the failure determination unit 36 determines that a failure has occurred (step S5). On the other hand, when the level of the state detection signal 39 returns to the normal range before the failure determination time T elapses, the failure determination unit 36 determines that no failure has occurred (step S6). After step 6, return to step 1.

  If it is determined that a failure has occurred (step S5), the storage management unit 38 determines whether or not there is sufficient storage capacity to store the level of the state detection signal 39 in the main storage unit 35 (step 7).

  When it is determined that the storage capacity sufficient to store the level of the state detection signal 39 remains in the main storage unit 5, the main storage unit 35 immediately before the time t2 when the failure determination unit 36 determines that a failure has occurred. The level of the state detection signal 39 and the level of the state detection signal 39 immediately after the time t2 are copied from the temporary storage unit 33 and stored in the main storage (step S8). On the other hand, when it is determined that there is not enough storage capacity to store the level of the state detection signal 39 in the storage unit 35, the vehicle failure detection device 31 ends the process.

  According to this conventional vehicle failure detection device 31, when the failure determination time T is short as shown in FIG. 9, the state detection signal stored in the temporary storage unit 33 immediately before and after the abnormality occurrence time t1. The main storage unit 35 can copy and store the 39 levels.

  However, when the failure determination time T is long as shown in FIG. 11, the main storage unit 35 stores the level of the state detection signal 39 stored in the temporary storage unit 33 immediately before and after the abnormality occurrence time t1. I can't remember. This is because the main storage unit 35 has a smaller storage capacity than the temporary storage unit 33, that is, the number of storage areas is small. This is because the state detection signal level immediately before and after t1 cannot be memorized. The level of the state detection signal 39 immediately before and after the abnormality occurrence time t1 clearly indicates the starting point of the abnormality occurrence. Therefore, if the level of the state detection signal 39 immediately before and after the abnormality occurrence time point t1 is not stored, the user cannot accurately grasp the failure occurrence location and the cause of the failure occurrence at the time of vehicle failure diagnosis.

Moreover, the technique currently disclosed by patent document 1 is proposed as a prior art similar to this vehicle failure detection apparatus. The technique disclosed in Patent Document 1 also performs the main storage operation of the state detection signal level immediately before and after the failure determination time elapses, as in the above-described conventional technique. For this reason, when the failure determination time is long, the main storage unit cannot store the state detection signal level immediately before and after the abnormality occurrence time.
JP-A-63-88423

  The present invention has been made in view of the above circumstances, and even when the failure determination time is long, the state detection signal level immediately before and after the occurrence of the abnormality can be surely stored, thereby accurately An object of the present invention is to provide a vehicle failure detection device that enables simple vehicle failure diagnosis.

The vehicle failure detection device according to the present invention is
A device for detecting vehicle failure,
A sensor that detects the state of the vehicle component and outputs a state detection signal;
A temporary storage unit that periodically temporarily stores the level of the state detection signal;
A level determination unit that determines whether the level of the state detection signal is in a normal range or an abnormal range;
The level of the state detection signal immediately before the time point when the level of the state detection signal enters the abnormal region from the normal range and the level of the state detection signal immediately after the time point are copied from the temporary storage unit And a main storage unit for storing.

  According to the present invention, the storage unit stores the level of the state detection signal immediately before the time point when the level of the state detection signal enters the abnormal region from the normal region and the level of the state detection signal immediately after the time point. Copy from and store it in the book. Therefore, even if the failure determination time is long, the state detection signal level immediately before and after the abnormality occurrence can be reliably stored. Thereby, an accurate vehicle fault diagnosis is possible.

In the present invention,
If the level of the abnormal state of the state detection signal continues from the time when the level of the state detection signal enters the abnormal region from the normal range until the failure determination time elapses, the occurrence of the failure is determined, and the failure determination is performed. A failure determination unit that determines that no failure has occurred when the level of the state detection signal returns to a normal range before time elapses;
When it is determined that no failure has occurred, it is preferable to include a storage erasure unit that erases the level of the state detection signal that is stored in the main storage unit.

  In this case, the memory erasure unit erases the level of the state detection signal that is permanently stored in the main storage unit when it is determined that no failure has occurred. Therefore, even when it is determined that no failure has occurred, a sufficient storage area of the storage unit can be secured.

In the present invention,
The main storage unit stores the level of the state detection signal immediately before the time point when the level of the state detection signal enters the abnormal region from the normal range and the level of the state detection signal immediately after the time point. It is preferable to copy the temporary storage unit and store it as a main memory.

  In this case, in addition to the level of the state detection signal immediately before the time point when the level of the state detection signal enters the abnormal range from the normal range, the main storage unit also stores the level of the state detection signal immediately before the time point. . In addition to the level of the state detection signal immediately after the time point, the main storage unit stores the level of the state detection signal immediately after the time point. Therefore, the number of data of the state detection signal level increases in the time series direction as compared with the case where the state detection signal level is stored only at one time point immediately before and after the occurrence of the abnormality. As a result, more accurate vehicle fault diagnosis can be performed.

In the present invention,
The sensor is provided for each vehicle component,
The main storage unit is configured to detect the level of each state detection signal immediately before the time point when the level of at least one state detection signal of each of the sensors enters the abnormal range from the normal range, and to detect each state immediately after the time point. It is preferable to copy the signal level from the temporary storage unit and store the signal level.

  In this case, this memory | storage part memorize | stores the level of the state detection signal from the sensor provided for every vehicle component. In addition, when the level of at least one state detection signal of each sensor enters the abnormal range from the normal range, the main storage unit also stores the level of the state detection signal in the normal range together. Therefore, processing such as storage is simplified as compared with the case where only the level of the state detection signal transitioned from the normal region to the abnormal region is stored.

The vehicle failure detection device according to the present invention is
A device for detecting vehicle failure,
A sensor that detects the state of the vehicle component and outputs a state detection signal;
A temporary storage unit that periodically temporarily stores the level of the state detection signal;
A level determination unit that determines whether the level of the state detection signal is in a normal range or an abnormal range;
A failure determination unit that determines that a failure has occurred when the level of the abnormal state of the state detection signal continues from the time when the level of the state detection signal enters the abnormal region from the normal region until the failure determination time elapses; ,
When it is determined that a failure has occurred, the level of the state detection signal immediately before the time when the level of the state detection signal enters the abnormal range from the normal range and the level of the state detection signal immediately after the point A main storage unit that is copied from the storage unit and stores the main data.

  According to the present invention, the storage unit stores the level of the state detection signal immediately before the time point when the level of the state detection signal enters the abnormal region from the normal region and the level of the state detection signal immediately after the time point. Copy from and store it in the book. Therefore, even if the failure determination time is long, the state detection signal level immediately before and after the occurrence of the abnormality can be reliably stored. Thereby, an accurate vehicle fault diagnosis becomes possible. In addition, since the storage unit stores the level of the state detection signal when it is determined that a failure has occurred, the stored level of the state detection signal should be stored as evidence of the occurrence of the failure. There is no need to do. Therefore, it is not necessary to erase the stored state detection signal level, and the processing speed can be increased.

In the present invention, the temporary storage unit temporarily stores the data indicating that the state detection signal is in an abnormal region as a set with the level of the corresponding state detection signal when the level of the state detection signal is in an abnormal region,
It further includes a storage management unit that searches for data indicating the abnormal region and detects a time point when the level of the state detection signal enters the abnormal region from the normal region based on the search result,
When the failure determination unit determines that a failure has occurred, the main storage unit stores the level of the state detection signal immediately before the time when the level of the state detection signal enters the abnormal range from the normal range from the temporary storage unit. It is preferable to copy and store the book.

  In this case, the time point when the level of the state detection signal enters the abnormal region from the normal region is detected based on the search result of the data indicating the abnormal region. Therefore, it is possible to detect the time of occurrence of the abnormality retroactively from the time when it is determined that a failure has occurred (at the time of failure determination), and to reliably store the state detection signal level immediately before and after the occurrence of the abnormality.

  Even when the failure determination time is long, the state detection signal level immediately before and after the occurrence of an abnormality can be reliably stored, thereby providing a vehicle failure detection device that enables accurate vehicle failure diagnosis. be able to.

(First embodiment)
A vehicle failure detection apparatus according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the vehicle failure detection apparatus according to the first embodiment. FIG. 2 is a diagram showing how the vehicle failure detection device stores the level of the signal input from the sensor, and when the level of the state detection signal continues in the abnormal range until the failure determination time elapses. It is a figure which shows a memory | storage process.

  The vehicle failure detection apparatus 1 according to the first embodiment includes a sensor 2, a temporary storage unit 3, a level determination unit 4, a main storage unit 5, a failure determination unit 6, and a storage management unit 8.

  The sensor 2 detects the state of a vehicle component (not shown) and outputs a state detection signal 9. The sensor 2 is usually provided for each vehicle component (not shown). When the state detection target is one vehicle component, the number of sensors 2 can be one. Examples of the state detection signal 9 include a signal indicating the coolant temperature, the engine speed, and the battery voltage.

  The temporary storage unit 3 periodically temporarily stores the level of the state detection signal 9. The temporary storage unit 3 is a RAM such as a circular buffer. The temporary storage unit 3 has storage areas a, b, c, d, e, and f in the example shown in FIG. 2, but the number of storage areas is not limited to this. The temporary storage unit 3 stores data by a first-in first-out method.

  The temporary storage unit 3 copies and stores the level of the state detection signal 9 output from each sensor 2 from the temporary storage unit 3. The storage unit 5 stores the level of the state detection signal 9 input from each sensor 2 at the same time as one set. The main storage unit 5 can store the levels of a plurality of sets of signals 9. A set of detection signal levels at each time is stored in storage areas a, b, c, d, e, and f, respectively.

  The level determination unit 4 determines whether the level of the state detection signal 9 is in a normal range or an abnormal range.

  The main storage unit 5 is a ROM capable of erasing, appending, and rewriting data, such as PROM, EPROM, and EEPROM. In the example shown in FIG. 2, the main storage unit 5 has storage areas A, B, C, and D, but the number of storage areas is not limited to this.

  The storage unit 5 stores the level of the state detection signal 9 immediately before the time point t1 when the level of the state detection signal 9 enters the abnormal region from the normal range and the level of the state detection signal 9 immediately after the time point t1. Copy from 3 and store it.

  In the example illustrated in FIG. 2, the storage unit 5 includes the level of the state detection signal 9 immediately before the time point t1, the level of the state detection signal 9 immediately before the time point t1, and the level of the state detection signal 9 immediately before the time point t1. The level of the subsequent state detection signal 9 is copied from the temporary storage unit 3 and is stored in the main storage. In the example shown in FIG. 2, the levels of the state detection signals 9 stored in the storage areas c, d, e, and f of the temporary storage unit 3 are the storage areas A, B, C, and D is copied and stored. Note that the main storage unit 5 may store the level of the state detection signal 9 only at one time point immediately before and after the abnormality occurrence time point t1.

  If the level of at least one of the state detection signals 9 output from each sensor 2 enters the abnormal region from the normal region, the storage unit 5 detects each state immediately before the point in time t1 when it enters. The level of the signal 9 and the level of each state detection signal 9 immediately after the time t1 are copied from the temporary storage unit 3 and are stored in the main storage. The same applies to the level of the state detection signal 9 immediately before the time point t1 and the level of the state detection signal immediately after the time point t1. The main storage unit 5 stores the state detection signal 9 stored in the storage areas c, d, e, and f of the temporary storage unit 3 as a set in the storage areas A, B, C, and D as it is. .

  The failure determination unit 6 generates a failure when the level of the abnormal state of the state detection signal 9 continues from the time t1 when the level of the state detection signal 9 enters the abnormal region from the normal region until the failure determination time T elapses. Is determined. The failure determination unit 6 determines that no failure has occurred when the level of the state detection signal 9 returns to the normal range before the failure determination time T elapses.

  The storage management unit 8 controls the storage operations of the temporary storage unit 3 and the main storage unit 5. The storage management unit 8 includes a storage erasure unit 7. When the failure determination unit 6 determines that no failure has occurred, the storage erasure unit 7 deletes the level of the state detection signal 9 that is stored in the main storage unit 5.

  Hereinafter, the operation of the vehicle failure detection apparatus 1 according to the first embodiment will be described with reference to FIGS. FIG. 3 is a flowchart showing the operation of the vehicle failure detection apparatus 1. FIG. 4 is a diagram showing how the vehicle failure detection device 1 stores the level of the signal input from the sensor 2, and the level of the state detection signal 9 returns to the normal range before the failure determination time elapses. It is a figure which shows the memory | storage process in the case of having performed.

  First, the state detection signal 9 is input from the sensor 2 to the level determination unit 4 (step S1 in FIG. 3).

  Then, the temporary storage unit 3 periodically temporarily stores the level of the state detection signal 9 (step S2).

  Next, the level determination unit 4 determines whether the level of the state detection signal 9 output from the sensor 2 is in a normal region or an abnormal region (step S3).

  When it is determined that the level of the state detection signal 9 is in the normal range, the process returns to step 1. On the other hand, if it is determined that the level of the state detection signal 9 is in the abnormal range, it is determined whether or not there is sufficient storage capacity in the main storage unit 5 to store the level of the state detection signal 9 (step S4). .

  When it is determined that the storage capacity sufficient to store the level of the state detection signal 9 remains in the main storage unit 5, the main storage unit 5 determines when the level of the state detection signal 9 enters the abnormal range from the normal range. The level of the state detection signal 9 immediately before and before t1 and the level of the state detection signal 9 immediately after and after the time t1 are copied from the temporary storage unit 3 and stored in the main storage (step S5). On the other hand, when it is determined that there is not enough storage capacity to store the level of the state detection signal 9 in the main storage unit 5, the vehicle failure detection device 1 ends the process.

  Next, the failure determination unit 6 determines whether or not a failure has occurred based on whether or not the predetermined failure determination time T has passed while the level of the state detection signal 9 is in the abnormal range (step S6).

  When it is determined that the failure determination time T has elapsed, the failure determination unit 6 determines that a failure has occurred (step S7). After step 7, return to step 1. On the other hand, when it is determined that the level of the state detection signal 9 has returned to the normal range (see FIG. 4) before the failure determination time T has elapsed, the failure determination unit 6 determines that no failure has occurred (step S8). . Next, the memory erasure unit 7 erases the level of the state detection signal 9 stored in the main storage unit 5 (step S9). After step S9, the process returns to step 1.

  As described above, according to the vehicle failure detection device 1 according to the first embodiment, the main storage is performed with reference to the time point t1 when the level of the state detection signal 9 enters the abnormal region from the normal region. The storage unit 5 stores the level of the state detection signal 9 immediately before the time point t1 when the level of the state detection signal 9 enters the abnormal region from the normal range and the level of the state detection signal 9 immediately after the time point t1. Copy from 3 and store it. Therefore, even when the failure determination time T is long, the level of the state detection signal 9 can be reliably stored right before and after the abnormality occurrence time t1. Thereby, an accurate vehicle fault diagnosis becomes possible.

(Second Embodiment)
A vehicle failure detection apparatus according to a second embodiment of the present invention will be described with reference to the drawings. FIG. 5 is a block diagram illustrating a configuration of the vehicle failure detection device according to the second embodiment. FIG. 6 is a diagram illustrating how the vehicle failure detection apparatus according to the second embodiment stores the level of the signal input from the sensor. FIG. 7 is a flowchart showing the operation of the vehicle failure detection apparatus according to the second embodiment.
About the structure similar to 1st Embodiment, the same referential mark is attached | subjected and the description is abbreviate | omitted.

  The vehicle failure detection device 21 according to the second embodiment includes a sensor 2, a temporary storage unit 23, a level determination unit 4, a failure determination unit 6, a main storage unit 25, and a storage management unit 28.

  The second embodiment differs from the first embodiment in that a temporary storage unit 23 is provided instead of the temporary storage unit 3, a main storage unit 25 is provided instead of the main storage unit 5, and a storage management unit 8 is stored. The management unit 28 is provided.

  The temporary storage unit 23 has the following functions in addition to the functions of the temporary storage unit 3 in the first embodiment. That is, when the level determination unit 4 determines that the level of the state detection signal 9 is in the normal range, the temporary storage unit 23 sets the data indicating “normal range” together with the level of the corresponding state detection signal 9. Temporarily remember. Further, when the level determination unit 4 determines that the level of the state detection signal 9 is in the abnormal region, the temporary storage unit 23 sets the data indicating the “abnormal region” together with the level of the corresponding state detection signal 9. Temporarily remember.

  When the failure determination unit 6 determines that a failure has occurred, the storage unit 25 stores the level of the state detection signal 9 immediately before the time t1 when the level of the state detection signal 9 enters the abnormal region from the normal region, and the time t1. The level of the state detection signal 9 immediately after is copied from the temporary storage unit 23 and is stored in the main storage.

  When the failure determination unit 6 determines that a failure has occurred, the storage unit 25 has, in addition to the level of the state detection signal 9 immediately before the time point t1, the level of the state detection signal 9 immediately before the time point t1, The level of the state detection signal 9 immediately after the time t1 is copied from the temporary storage unit 23 and is stored in the main storage. In the example shown in FIG. 6, the levels of the state detection signals 9 stored in the storage areas c, d, e, and f of the temporary storage unit 23 are the storage areas A, B, C, and D is copied and stored. Note that the main storage unit 25 may store the level of the state detection signal 9 only at one time point immediately before and immediately after the abnormality occurrence time point t1.

  If it is determined that a failure has occurred in at least one state detection signal 9 among the state detection signals 9 output by each sensor 2, the storage unit 25 determines the level of each state detection signal 9 immediately before time t1. And the level of each state detection signal 9 immediately after the time t1 is copied from the temporary storage unit 23 and is stored in the main storage. The same applies to the level of the state detection signal 9 immediately before the time point t1 and the level of the state detection signal immediately after the time point t1. The main storage unit 25 copies the level of the state detection signal 9 stored in each storage area c, d, e, f of the temporary storage unit 23 as a set to the storage areas A, B, C, D as it is. Remember.

  The storage management unit 28 controls the storage operations of the temporary storage unit 23 and the main storage unit 25. When the failure determination unit 6 determines that a failure has occurred, the storage management unit 28 searches for data indicating the “abnormal area” in the temporary storage unit 3. Based on the search result, the storage management unit 28 detects a time point t1 at which the transition from the “normal region” to the “abnormal region” is detected, and the level of the state detection signal 9 immediately before and before the time point t1 and the time point t1. The main storage unit 25 stores the level of the state detection signal 9 immediately after and after that.

  Hereinafter, the operation of the vehicle failure detection apparatus 21 according to the second embodiment will be described with reference to FIGS.

  First, the state detection signal 9 is input from the sensor 2 to the level determination unit 4 (step S1 in FIG. 7).

  Then, the temporary storage unit 23 periodically temporarily stores the level of the state detection signal 9 (step S2).

  Next, the level determination unit 4 determines whether the level of the state detection signal 9 output from the sensor 2 is in a normal region or an abnormal region (step S3).

  When it is determined that the level of the state detection signal 9 is in the normal range, the temporary storage unit 23 temporarily stores data indicating “normal range” as a set with the level of the corresponding state detection signal 9 (step S4). . After step 4, return to step 1. On the other hand, if it is determined that the level of the state detection signal 9 is in the abnormal range, the temporary storage unit 23 temporarily stores data indicating the “abnormal range” as a set with the level of the corresponding state detection signal 9 (step). S5).

  Next, the failure determination unit 6 determines whether or not a failure has occurred based on whether or not the predetermined failure determination time T has passed while the level of the state detection signal 9 is in the abnormal range (step S6).

  When it is determined that the failure determination time T has elapsed, the failure determination unit 6 determines that a failure has occurred (step S7). When it is determined that a failure has occurred, data indicating the “abnormal area” in the temporary storage unit 23 is searched (step S8). On the other hand, when it is determined that the level of the state detection signal 9 has returned to the normal range before the failure determination time T has elapsed, the failure determination unit 6 determines that no failure has occurred (step S9). After step S9, the process returns to step S1.

  After step S8, it is determined whether or not there is sufficient storage capacity to store the level of the state detection signal 9 in the main storage unit 25 (step S10).

  When it is determined that there is sufficient storage capacity to store the level of the state detection signal 9 in the main storage unit 25, the main storage unit 25 determines when the level of the state detection signal 9 enters the abnormal range from the normal range. The level of the state detection signal 9 immediately before and before t1, and the level of the state detection signal immediately after and after the time t1, are copied from the temporary storage unit 23 and are stored in the main storage (step S11). After step S11, the process returns to step S1. On the other hand, when it is determined that there is not enough storage capacity to store the level of the state detection signal 9 in the main storage unit 25, the vehicle failure detection device 21 ends the process.

  In the first embodiment, the main storage is performed based on the time point t1 when the level of the state detection signal 9 enters the abnormal range from the normal range, whereas in the second embodiment, as described above, the state detection signal 9 The main storage is performed based on the time when the failure determination time T has passed while the level is in the abnormal range, that is, when the failure is confirmed.

  Since the main storage unit 25 stores the level of the state detection signal 9 based on the time point when the failure determination time T has elapsed (when the failure is determined), the stored level of the state detection signal 9 is used as evidence of the occurrence of the failure. It should be memorized and does not need to be erased. Therefore, in the second embodiment, the processing is simplified as compared with the first embodiment, because the operation of erasing the stored data is unnecessary.

  The vehicle failure detection device according to the present invention is useful as a device for performing accurate vehicle failure diagnosis.

The block diagram which shows the structure of the vehicle failure detection apparatus which concerns on 1st Embodiment of this invention. It is a figure which shows how the vehicle failure detection apparatus memorize | stores the level of the signal input from the sensor in 1st Embodiment, and when the level of a state detection signal continues with an abnormal region until failure determination time passes Of storage processing The flowchart which shows operation | movement of the vehicle failure detection apparatus which concerns on 1st Embodiment. It is a figure which shows how the vehicle failure detection apparatus which concerns on 1st Embodiment memorize | stores the level of the signal input from the sensor, and before the failure determination time passed, the level of the state detection signal returned to the normal region Of storage processing in case The block diagram which shows the structure of the vehicle failure detection apparatus which concerns on 2nd Embodiment. The figure which shows how the vehicle failure detection apparatus which concerns on 2nd Embodiment memorize | stores the level of the signal input from the sensor. The flowchart which shows operation | movement of the vehicle failure detection apparatus which concerns on 2nd Embodiment. Block diagram showing the configuration of a conventional vehicle failure detection device It is a figure which shows how the conventional vehicle failure detection apparatus memorize | stores the level of the signal input from the sensor, and is a figure which shows the case where failure determination time is short Flowchart showing the operation of a conventional vehicle failure detection device It is a figure which shows how the conventional vehicle failure detection apparatus memorize | stores the level of the signal input from the sensor, and is a figure which shows the case where failure determination time is long

Explanation of symbols

1, 21 Vehicle failure detection device 2 Sensor 3, 23 Temporary storage unit 4 Level determination unit 5, 25 Main storage unit 6 Failure determination unit 7 Storage erasure unit 8, 28 Storage management unit 9 Status detection signal

Claims (4)

A device for detecting vehicle failure,
A sensor that detects the state of the vehicle component and outputs a state detection signal;
A temporary storage unit that periodically temporarily stores the level of the state detection signal;
A level determination unit that determines whether the level of the state detection signal is in a normal region or an abnormal region;
The level of the state detection signal immediately before the time point when the level of the state detection signal enters the abnormal region from the normal range and the level of the state detection signal immediately after the time point are copied and temporarily stored from the temporary storage unit. A main storage unit ;
If the level of the abnormal state of the state detection signal continues from the time when the level of the state detection signal enters the abnormal region from the normal region until the failure determination time has elapsed, it is determined that a failure has occurred, and the failure determination time A failure determination unit that determines that no failure has occurred when the level of the state detection signal returns to a normal range before elapses;
A vehicle failure detection apparatus comprising: a memory erasure unit that erases the level of the state detection signal that is permanently stored in the main storage unit when the failure determination unit determines that no failure has occurred . The main storage unit stores the level of the state detection signal immediately before the time point when the level of the state detection signal enters the abnormal region from the normal range, and the level of the state detection signal immediately after the time point. The vehicle failure detection device according to claim 1, wherein the vehicle failure detection device is copied from the temporary storage unit and stored in the main storage. The sensor is provided for each vehicle component,
The main storage unit includes the level of each state detection signal immediately before the time when the level of at least one state detection signal of each of the sensors enters the abnormal range from the normal range, and each state detection immediately after the time point. the level of the signal, characterized in that the stored copy from the temporary storage unit, the vehicle failure detection device according to claim 1 or 2. A device for detecting vehicle failure,
A sensor that detects the state of the vehicle component and outputs a state detection signal ;
And determining the level determining section for determining the level of pre-Symbol state detection signal is in one of the normal range and abnormal range,
When the level of the state detection signal is temporarily temporarily stored, the data indicating that the state detection signal is in the normal range when the level of the state detection signal is in the normal range, and the level of the state detection signal is in the abnormal range Is a temporary storage unit that temporarily stores data indicating an abnormal area as a set with the level of the corresponding state detection signal;
A failure determination unit that determines that a failure has occurred when the level of the abnormal state of the state detection signal continues from the time when the level of the state detection signal has entered the abnormal region from the normal region until the failure determination time has elapsed; ,
When it is determined that a failure has occurred in the failure determination unit, data indicating the abnormal region is searched, and the level at which the level of the state detection signal enters the abnormal region from the normal region based on the search result A storage management unit to detect;
When the failure determination unit determines that a failure has occurred, the level of the state detection signal immediately before the time when the level of the state detection signal enters the abnormal range from the normal range, and the level of the state detection signal immediately after the time point A vehicle failure detection device comprising: a main storage unit that stores a copy of the data from the temporary storage unit.

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