JPH0893544A - Diagnostic data storing system - Google Patents

Abstract

PURPOSE: To prevent erroneous diagnosis even when power supply is cut off while the abnormality diagnostic data having low priority is being forcibly renewed to the abnormality diagnostic data having high priority. CONSTITUTION: Various kinds of diagnostic data are periodically renewed and stored into a frame of a memory, and renewing of the diagnostic data is prohibited after an abnormality is generated. After that, when an abnormality having priority higher than that of an abnormality stored in the frame is generated, the renewing prohibiting state of the frame date is temporarily released, and the frame data is forcibly renewed to the abnormality diagnostic date having high priority. In this case, the frame data is initialized by a value (for example, 0) capable of being discriminated from the diagnostic data prior to renewing of the data, and then the frame data is renewed. Accordingly, even if the power supply is cut off in the course of the renewing processing, whether the frame data is a real diagnostic data (an initial value) or the data not renewed and remaining caused by cutting off of power supply can be easily discriminated from the value of the data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diagnostic data storage system used for diagnostics (self-diagnosis device) for monitoring the presence or absence of abnormalities in equipment.

[0002]

2. Description of the Related Art For example, in automobiles which have been advanced in electronic control in recent years, it is constantly monitored by diagnostics whether or not there is an abnormality in the operating conditions of in-vehicle devices such as engines and exhaust gas-related devices. When an error occurs, the driver is notified of the error by a warning light, etc., and the diagnostic data (various sensor data, control data) when the error occurs is stored in the memory, and the diagnostic data is read from the memory at the service factory. So that you can know exactly.

In such diagnosis, a method of storing diagnostic data when an abnormality occurs in a memory is disclosed in JP-A-62-142849 and JP-A-63-90738.
As shown in Japanese Patent Publication, diagnostic data necessary for diagnosing a device abnormality is constantly updated and stored in a memory at a constant cycle, and when an error occurs, the subsequent update of diagnostic data is prohibited (freeze). As a result, the diagnostic data at the time of occurrence of an abnormality is held in the memory.

However, in such a diagnostic data storage method, if some abnormality occurs once and updating of the diagnostic data is prohibited, even if a more serious abnormality occurs thereafter, that The disadvantage is that diagnostic data cannot be stored in memory.

Therefore, in order to solve this drawback, the present applicant assigns a priority of updating the diagnostic data according to the severity of the abnormality as shown in Japanese Patent Laid-Open No. 6-66197, and the priority is high. The abnormality diagnosis data and the low abnormality diagnosis data are updated and stored in separate storage areas of the memory, and even after the update of the low-priority abnormality diagnosis data is prohibited, the high priority is set in another storage area. It is proposed that the diagnostic data of abnormality can be updated and stored.

[0006]

However, in the above configuration, a plurality of diagnostic data storage areas are required according to the priority of abnormality, so that the memory capacity must be greatly increased, which is an important issue in recent years. It goes against the demand for cost reduction, which is a technical issue.

In order to solve this, the present inventor, when an abnormality with a high priority occurs after an abnormality with a low priority occurs, the present inventor sets the diagnostic data of the abnormality with a low priority as an abnormality with a high priority. I think that it is better to forcefully update the diagnostic data.

However, in this case, if the ignition switch is turned off and the power supply is cut off during the updating of the diagnostic data, the portion of the diagnostic data storage area of the memory where the data update is not yet completed. Will remain, which will give a wrong diagnostic data. In order to avoid this, it may be possible to provide a relay circuit that continues to supply power for a while even after the ignition switch is turned off. However, this complicates the hardware configuration and goes against the demand for cost reduction.

The present invention has been made in view of the above circumstances, and therefore an object thereof is to make it possible to store diagnostic data of abnormalities of different priorities in the same storage area while giving priority to abnormalities of high priority. It is an object of the present invention to provide a diagnostic data storage system capable of determining the data value even when the power supply is cut off during updating of the diagnostic data and preventing erroneous diagnosis.

[0010]

In order to achieve the above object, the diagnostic data storage system according to claim 1 of the present invention comprises a storage means for repeatedly updating and storing diagnostic data necessary for diagnosing an abnormality of a device. In order to retain the diagnostic data at the time of occurrence of an abnormality by prohibiting the subsequent update of the diagnostic data when the abnormality of the equipment occurs, the diagnostic data is updated according to the severity of the abnormality of the equipment. Priority determining means for determining the priority of the diagnostic data, and when an abnormality having a higher priority than the abnormality stored in the storage means occurs, the update prohibition state of the diagnostic data is temporarily released to Priority data updating means forcibly updating to diagnostic data of high abnormality, and the diagnostic data storage area of the storage means can be distinguished from the diagnostic data prior to updating the diagnostic data. Such is obtained by a structure in which a initializing means for initializing the value.

In this case, as in claim 2, when the diagnostic data is updated, the data may be updated in order of importance. Further, when the initialization means initializes the diagnostic data storage area of the storage means, the initialization may be performed in the order of data having a low degree of importance. Further, as in claim 4, a data update normal end determination means for determining whether or not the update of the diagnostic data in the storage means has been normally completed up to the last address may be provided.

In this structure, when the data update normal end determination means determines that the data update is not normally completed up to the last address, the data is stored in the storage means. It is also possible to temporarily cancel the update prohibition state of the diagnostic data and forcibly update the diagnostic data when an abnormality with a priority equal to or higher than the priority of the present abnormality occurs.

According to a sixth aspect of the present invention, the data update normal termination determining means determines whether or not the data stored in the diagnostic data storage area of the storage means is stored at an address where the data update is performed last. It may be possible to determine whether the update has been normally completed up to the last address.

[0014]

According to the above-mentioned structure of the first aspect, the diagnostic data is repeatedly stored in the storage means, and when the abnormality of the device occurs, the diagnostic data at the time of the abnormality is prohibited by prohibiting the update of the diagnostic data thereafter. The data is held in the storage means.
After that, when another abnormality occurs, the priority of the diagnostic data update is determined by the priority determination means according to the severity of the abnormality, and the priority is higher than that of the abnormality stored in the storage means. When a high abnormality occurs, the priority data updating means temporarily cancels the update prohibition state of the diagnostic data, and the diagnostic data stored in the storage means is forced to be the diagnostic data of the high priority abnormality. Update. At this time, prior to updating the data, the initializing means initializes the diagnostic data storage area of the storage means with a value that can be distinguished from the diagnostic data, and then updates the diagnostic data. Therefore, even if the power supply is cut off in the middle of this updating process, whether the data stored in the diagnostic data storage area is true diagnostic data or remains unupdated due to the power supply cutoff. It is possible to easily discriminate whether or not the data is the initial data, and it is possible to prevent erroneous diagnosis.
Even in this case, the diagnostic data updated before the power supply is cut off is reliable, and the cause of the abnormality can be estimated to some extent using this data.

In this case, if the diagnostic data is updated in the order of the most important data when the diagnostic data is updated, the power supply may be cut off during the update process. However, the data of high importance has already been updated, and the damage can be minimized.

Further, when the diagnostic data storage area of the storage means is initialized by the initialization means in the order of the data having lower importance, the initialization processing may be performed in the middle of the initialization process. In the unlikely event that the power supply is cut off,
Highly important data is not initialized and remains until the end, so damage is minimized.

Further, in claim 4, the data update normal end determining means determines whether or not the update of the diagnostic data in the storage means has been normally completed up to the last address. This allows
If the data update is not normally completed up to the last address, this can be automatically determined. However, a person may determine whether or not the data update is normally completed up to the last address.

In this case, if the data update normal end determining means determines that the data update has not normally ended up to the last address, the abnormality priority stored in the storage means is given priority. When an abnormality having a priority equal to or higher than the priority occurs, the update prohibition state of the diagnostic data is temporarily released and the diagnostic data is forcibly updated. As a result, when the data update ends midway, the diagnostic data can be updated again according to the priority.

According to a sixth aspect of the present invention, the data update normal end determining means looks at the data stored at the address where the data update is performed last in the diagnostic data storage area of the storage means. It is determined whether or not the process ends normally. In other words, if the data at the address where the data is updated last remains the initial value, it is determined that the data has not been updated up to the last address, and if not, it is determined that all data updates have been completed normally. It

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a diagnosis (self-diagnosis device) of an automobile equipped with a V-type engine will be described below with reference to the drawings. First, a schematic configuration of the entire engine control system system will be described with reference to FIGS. 1 and 2. An air flow meter 14 is provided on the upstream side of an intake pipe 13 connected to an intake port 12 of the engine 11, and an intake air flow rate measured by the air flow meter 14 is converted into a voltage signal by a potentiometer 15 and output.
An intake air temperature sensor 16 for detecting the intake air temperature and a throttle valve 17 are provided on the downstream side of the air flow meter 14, and the opening degree of the throttle valve 17 is detected by a throttle sensor 18. Further, a fuel injection valve 19 is provided near the intake port 12.

On the other hand, an exhaust pipe 21 connected to the exhaust port 20 of the engine 11 is provided with an O ₂ sensor 22 for detecting the oxygen concentration in the exhaust gas and an exhaust gas purifying catalyst 23. A water temperature sensor 25 that detects the cooling water temperature is attached to the water jacket 24 that cools the engine 11. The distributor 27, which distributes a high voltage current to the spark plug 26 of each cylinder of the engine 11, includes a cylinder discrimination sensor 28 for discriminating a crank angle reference position of a specific cylinder, and a pulse signal having a frequency corresponding to the engine speed. A rotation angle sensor 29 that outputs is output. The high voltage secondary current of the igniter 30 is supplied to the distributor 27.

Although not shown in FIG. 1, since the engine 11 of this embodiment is a V-type engine, there are two systems of intake and exhaust systems, A bank and B bank. As shown in FIG. Air flow meter 14 potentiometer 15 and O
_{Two 2} sensors 22 are provided.

On the other hand, the control unit 31 for controlling the engine 11, as shown in FIG. 2, receives various sensor data from the multiplexer 32, the A / D conversion circuit 33, and the waveform shaping circuit 3.
4, the input / output ports 35 and 36, and the data bus 45 are read into the CPU 37 for calculation, and the control signal obtained by the calculation is output from the output ports 38, 39 and 40 to the drive circuit 4
1, 42, 33 to output an abnormality warning means 4 such as a warning light.
4, controlling operations of the igniter 30 and the fuel injection valve 19.

The control unit 31 is provided with an oscillation circuit 46 for giving a clock to the CPU 37, a RAM 47, a standby RAM 48 (storage means), and a ROM 49. The RAM 47 is a volatile memory that temporarily stores data, and the standby RAM 48 is a RAM with backup power supply (which may be EEPROM). Power is supplied to the control unit 31 by turning off the ignition switch (IG). It is a rewritable non-volatile memory that retains stored data even when it is cut off. Also,
In the ROM 49, in addition to various engine control programs,
A program for the self-diagnosis function (diagnosis) shown in FIGS. 3 to 7 is stored. When an abnormality is detected by executing this self-diagnosis program, the abnormality warning means 44 such as a warning light notifies the driver of the abnormality, and the diagnostic data at the time of the abnormality is diagnosed in the standby RAM 48 as described later. It is stored and held in the data storage area (frame). When the diagnostic data at the time of occurrence of an abnormality is read from the standby RAM 48, the failure diagnostic device 51 is externally provided to the mutual communication circuit 50 of the control unit 31.
Is connected by a connector or the like, the failure diagnosis device 51 can read the diagnostic data at the time of occurrence of an abnormality and analyze the occurrence state of the abnormality.

Next, the self-diagnosis program of FIGS. 3 to 7 executed by the control unit 31 will be described.
FIG. 3 is a routine for detecting an abnormality in the fuel system, which is periodically executed, for example, every 128 milliseconds. In this routine, first, in steps 301 and 302, it is determined whether the air-fuel ratio correction coefficient FAF is the upper limit value or the lower limit value. Here, the air-fuel ratio correction coefficient FAF is calculated by the O ₂ sensor 22.
Is the value obtained by integrating and skipping the output of.
In the above steps 301 and 302, the air-fuel ratio correction coefficient FAF
Is determined to be either the upper limit value or the lower limit value,
It is determined whether or not the state has continued for 10 seconds (step 30
4) After continuing for 10 seconds, it is considered that the fuel system abnormality has occurred, and the fuel system abnormality flag is set to a predetermined address of the normal RAM 47 (step 304). However, if the state of the air-fuel ratio correction coefficient FAF = upper / lower limit value ends within 10 seconds, the determination in step 303 becomes “No”, and this routine is ended without setting the fuel system abnormality flag. Further, in steps 301 and 302, the air-fuel ratio correction coefficient FAF
If it is determined that is neither the upper limit nor the lower limit, the fuel system abnormality flag is cleared (step 305) and this routine is ended.

On the other hand, FIG. 4 shows a routine for detecting an abnormality in the throttle sensor 18, which is periodically executed, for example, every 64 msec. In this routine, first, step 4
At 01 and 402, it is determined whether or not the throttle opening signal output from the throttle sensor 18 is within a normal range (0.1 V <throttle opening signal ≦ 4.9 V). Since the sensor 18 is normal,
In step 405, the throttle sensor fail counter in the normal RAM 47 is cleared and the throttle sensor fail flag is also cleared (step 4).
06). On the other hand, if the throttle opening signal is out of the normal range, the routine proceeds to step 403, where it is judged whether or not the state has continued for 500 msec. If it continues for 500 msec, it is considered that the abnormality of the throttle sensor 18 has occurred. The throttle sensor abnormality flag is set in the normal RAM 47 (step 404). However, if the state where the throttle opening signal is out of the normal range ends within 500 ms, step 40
The determination of No. 3 is "No", and this routine is terminated without setting the throttle sensor abnormality flag.

Next, the diagnostic data updated and stored in the diagnostic data storage area (hereinafter referred to as "frame") in the standby RAM 48 will be described. As the diagnostic data in this embodiment, as shown in FIG. 8, for example, engine speed, engine water temperature, vehicle speed, engine load (A bank), engine load (B bank), intake air temperature, fuel system learning value ( A bank), fuel system learning value (B bank), air-fuel ratio correction coefficient FAF (A bank), air-fuel ratio correction coefficient FA
F (B bank) is updated and stored at each address of the frame (hereinafter, these diagnostic data are collectively referred to as "frame data"). An abnormal code indicating the type of abnormality is stored in the address at the head of the frame. As shown in FIG. 9, the value of this abnormality code is, for example, "0121" when the throttle sensor is abnormal and "0" when the fuel system is abnormal.
This abnormal code is also used as data for determining the severity of abnormality, that is, the priority of update storage. In this embodiment, frame data is stored at higher addresses as data of higher importance. Therefore, when updating the data, the data is updated in the order of importance.

This frame data is updated to the latest diagnostic data every 64 msec, for example, by periodically executing the routine shown in FIG. 5 (step 502), and thereafter, at the time when the abnormal code is stored, that is, When any abnormality occurs, the subsequent frame data update is prohibited and is frozen (step 501).

By the way, in the conventional system, once some abnormality occurs and the frame data is frozen, the frame data can be updated even if a more serious abnormality occurs thereafter. There was a drawback that I could not.

Therefore, in this embodiment, in order to solve the above-mentioned drawback, the priority data update processing routine shown in FIG. 6 is periodically executed, for example, every 64 msec, so that an abnormality of high priority occurs. The update prohibition state (freezing of frame data) of the diagnostic data is temporarily released, and the frame data is updated to the diagnostic data of the abnormality of high priority. Further, when it is determined that the data update is not normally completed up to the last address (that is, the freeze frame data error), an error having a priority equal to or higher than the priority of the error stored in the frame. When is generated, the freeze of the frame data is temporarily released and the frame data is forcibly updated. The processing flow of this priority data update processing routine will be described below with reference to the flowchart of FIG.

First, in step 601, it is determined whether or not the frame data at the time of occurrence of the abnormality of high priority has already been frozen depending on whether or not the abnormality code of high priority is stored at the head address of the frame. In this embodiment, the priority of abnormality is determined by the type of abnormality code,
It is determined that the priority of the fuel system abnormality (abnormality code = 0300) is higher than that of the throttle sensor abnormality (abnormality code = 0121). If the abnormal code of high priority is not yet stored, the determination in step 601 is "N".
However, if the abnormal code with high priority has already been stored, the determination in step 601 becomes “Yes” and the process proceeds to step 612.

(1) When the frame data of the high-priority abnormality has not been frozen yet, the routine proceeds to step 602, where it is determined whether the high-priority abnormality has occurred in the fuel system abnormality detection routine of FIG. It is determined by the fuel system abnormality flag described in the explanation, and if it has not occurred, step 603.
Then, it is determined whether or not the frame data at the time of occurrence of the low-priority abnormality has already been frozen depending on whether or not the low-priority abnormality code is stored. If the abnormal code with the low priority is not stored, the process proceeds to step 604 to check whether or not the abnormal code with the low priority has occurred.
This determination is made by the throttle sensor fail flag described in the explanation of the throttle sensor abnormality detection routine of No., and if it has not occurred, this routine is terminated without freezing the frame data. If it is determined in step 604 described above that a low-priority abnormality has occurred, the flow proceeds to step 605, where the abnormality code is stored at the beginning address of the frame, and a low-priority abnormality has occurred. Freeze the frame data when.

On the other hand, if it is determined in step 603 described above that the abnormal code with low priority has been stored, the process proceeds to step 606 to determine whether the freeze frame data is normal. That is, while the frame data is being updated, the power is turned off by turning off the ignition switch (IG), and as shown in FIG. 9C, a part of the frame data has not yet been updated. It is determined whether or not there is. If the data update is normally completed to the end, the determination in step 606 is “Yes”, and this routine is ended. That is, if the abnormal frame data with the low priority is already stored in the normal state, the freeze frame data is not updated and held until the abnormal with the high priority occurs thereafter.

On the other hand, if it is determined in step 606 that the freeze frame data is abnormal, step 6
If the abnormality of low priority has occurred in 07, the routine proceeds to step 608 to initialize (clear) the abnormality code to temporarily cancel the freeze state and initialize the frame data. Here, "initialization" means that
This means that the value written in each address of the frame as shown in FIG. 9A is rewritten to a value that can be distinguished from the diagnostic data as shown in FIG. 9B. In this embodiment, the data of all addresses is rewritten. Is cleared to "0".
However, “initialization” is not limited to “0” clear, and any value may be used as long as it can be distinguished from the diagnostic data. After clearing the frame data in step 608, the process proceeds to step 609 to store the abnormal code corresponding to the generated low priority abnormality and update the frame data to freeze the frame data. Even if the freeze frame data is determined to be abnormal, if an abnormality with low priority has not occurred, step 607.
The determination is “No”, and this routine ends without updating the frame data.

On the other hand, when a high-priority abnormality occurs for the first time, steps 601, 602 and step 61 are executed.
The process proceeds to 0 to determine whether or not the abnormal code with low priority has been stored. If not stored, the process proceeds to step 605.
Store the abnormal code and freeze the frame data.
On the other hand, if it is determined in step 610 that the abnormal code with low priority has been stored, the process proceeds to step 611, the abnormal code is cleared, the freeze state is temporarily released, and the frame data is saved. clear. At this time, the frame data as shown in FIG.
As shown in (b), it is cleared from the data of the address of low importance (the lowest address in this embodiment). After that, the process proceeds to step 615, the abnormal code corresponding to the generated high-priority abnormality is stored, the frame data is updated, the frame data is frozen, and this routine is ended.

(2) When abnormal high-priority frame data has already been frozen In this case, step 60
The judgment of 1 is “Yes” and the process proceeds to step 612.
It is determined whether or not the freeze frame data is normal. If the freeze frame data is normal, this routine is ended, and the abnormal freeze frame data with high priority is held without being updated. If the freeze frame data is abnormal, step 613.
Then, it is determined whether or not a high-priority abnormality has occurred, and if not, this routine is terminated. On the other hand, if a high-priority abnormality has occurred, the process proceeds to step 614, the abnormality code is cleared, the freeze state is temporarily released, and the frame data is cleared. Next, in step 615, the abnormal code is stored, the frame data is updated, and the frame data is frozen.

The processing of each step of the priority data update processing routine described above is "priority determining means", "priority data updating means", "initializing means".
Play a role as.

The judgment of normality / abnormality of the freeze frame data in the above-mentioned steps 606 and 612 is carried out by referring to FIG.
It is performed by the routine shown in. This routine plays a role as "data update normal end determination means" in the claims, and if it is determined in step 701 that no abnormal code is stored (CODE = $ 0000), the frame data is still frozen. Since this has not been done, this routine is terminated without performing the following processing. On the other hand, if the abnormal code is stored, the process proceeds to step 702, and the data FAF stored at the final address of the frame is stored.
It is determined whether or not B is "0", and if it is "0", the power is turned off during the data update and the data update ends midway as shown in FIG. 9C. Therefore, it is determined that the freeze frame data is abnormal (step 70).
3). If FAFB is not "0", it means that the freeze frame data is normal because the data update is completed up to the final address of the frame (step 70).
3).

According to the embodiment described above, when a high priority abnormality occurs after a low priority abnormality, the low priority abnormality diagnosis data is diagnosed as the high priority abnormality. I forced to update the data, so
It is possible to update and store abnormality diagnosis data having different priorities in one frame, and to reduce the memory capacity. In addition, when updating diagnostic data for abnormalities with low priority to diagnostic data for abnormalities with high priority, the diagnostic data is updated after initializing the frame with a value that can be distinguished from the diagnostic data, prior to updating the data. Therefore, as shown in FIG. 9C, even if the power supply (IG) is turned off in the middle of the data update process, whether the frame data is the real diagnostic data, It is possible to easily determine from the value of the data whether it is the data (initial value) left unupdated by turning off, and it is possible to prevent erroneous diagnosis. Even in this case, the data that has been updated before the power is turned off [CODE, N in the example of (c) of FIG.
[E, THW] is reliable, and the cause of abnormality can be estimated to some extent using this data.

Moreover, in this embodiment, the diagnostic data of higher importance is stored in the higher address of the frame, and when the data is updated, the data of higher importance is updated in order. Even if the power is turned off, data of high importance has already been updated,
The advantage is that the damage is minimized. However, the present invention is not limited to updating the diagnostic data in the descending order of importance, and the intended purpose of the invention can be sufficiently achieved even if the diagnostic data is not updated in the descending order of importance.

Further, in this embodiment, when the frame data is initialized (cleared), the data having the lowest importance is initialized in the order of importance.
Even if the power is turned off, the data of high importance remains uninitialized until the end, which has the advantage of minimizing damage. However, the present invention is not limited to initialization of frame data in ascending order of importance, and the intended purpose of the present invention can be sufficiently achieved even if the frame data is not initialized in an order of importance.

Further, in this embodiment, whether the data update is normally completed up to the last address by checking the data stored in the address (the lowest address) of the frame data where the data update is finally performed. Since it is determined whether or not the frame data is normal, it is possible to easily, quickly and accurately determine whether the frame data is normal or abnormal.

Moreover, when it is determined that the data update has not been normally completed up to the last address, when an abnormality with a priority equal to or higher than the priority of the abnormality stored in the frame occurs. In addition, since the update prohibition state (freezing of frame data) of the diagnostic data is temporarily canceled and the diagnostic data is forcibly updated, if the data update ends in the middle, priority is given again. The diagnostic data can be updated again at any time.

In this embodiment, the abnormality in the throttle sensor and the abnormality in the fuel system have been described as examples, but other engine abnormalities such as misfires and vehicle-mounted devices other than the engine such as the exhaust gas purifying device and the airbag system. It is needless to say that the present invention can be applied to a self-diagnosis device (diagnosis) of various devices other than automobiles and can be stored as diagnostic data.

Further, in the above-mentioned embodiment, there are only two steps of high priority and low priority, but the priority may be classified into three or more steps.

[0046]

As is apparent from the above description, according to the configuration of claim 1 of the present invention, it is possible to update and store the diagnostic data of abnormalities having different priorities in one diagnostic data storage area. The capacity can be reduced. Moreover, prior to the data update, the diagnostic data storage area is initialized with a value that can be distinguished from the diagnostic data, and then the diagnostic data is updated, so that the power supply should be cut off during the data update process. Even if the data is stored in the diagnostic data storage area, it is easy to determine from the data value whether it is the real diagnostic data or the data (initial value) left unupdated due to the power supply cutoff. It is possible to prevent misdiagnosis.

Further, according to the second aspect, since the data of higher importance is updated in the order of updating the data, even if the power supply is cut off in the middle of the updating process, the data of high importance is It has already been updated and the damage can be minimized.

Further, in the third aspect, when the diagnostic data storage area is initialized, the data having the lowest importance is initialized in order, so that the power supply should be cut off during the initialization process. Even if you do so, the data of high importance is not initialized and remains until the end, and the damage can be minimized.

Further, in claim 4, since it is determined whether or not the update of the diagnostic data is normally completed up to the last address, it is manually determined whether or not the stored data is normal. It can be automatically determined regardless of.

Further, in claim 5, when it is determined that the data update is not normally completed up to the last address, the priority of the abnormality stored in the diagnostic data storage area is equal to or higher than the priority of the abnormality. When an abnormality of priority occurs, the diagnostic data update prohibition state can be temporarily canceled to forcibly update the diagnostic data, and the frame data abnormality can be corrected to a normal state.

In the sixth aspect, it is determined whether or not the data update is normally completed up to the last address by looking at the data stored in the address where the data update is finally performed in the diagnostic data storage area. Therefore, the normality / abnormality of the stored diagnostic data can be determined easily, quickly and accurately.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of an entire engine control system system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing an electrical configuration of a control system.

FIG. 3 is a flowchart showing a flow of processing of a fuel system abnormality detection routine.

FIG. 4 is a flowchart showing a processing flow of a throttle sensor abnormality detection routine.

FIG. 5 is a flowchart showing a processing flow of a frame data update processing routine.

FIG. 6 is a flowchart showing a processing flow of a priority data update processing routine.

FIG. 7 is a flowchart showing the flow of processing of a freeze frame data normality / abnormality determination routine.

FIG. 8 is a memory map showing types of diagnostic data updated and stored at each address in a frame.

[Figure 9] Clear / update of frame data and power supply (IG)
Diagram explaining the relationship with OFF

[Explanation of symbols]

11 ... Engine, 31 ... Control unit, 47 ... RAM,
48 ... Standby RAM (storage means), 51 ... Failure diagnosis device.

Claims (6)

[Claims] 1. When an abnormality occurs by providing a storage unit for repeatedly updating and storing diagnostic data necessary for diagnosing an abnormality of the equipment, and prohibiting the update of the diagnostic data thereafter when the abnormality of the equipment occurs. In the diagnostic data storage system configured to hold the diagnostic data of, the priority determination means for determining the priority of the diagnostic data update according to the severity of the abnormality of the device, and the abnormality stored in the storage means. Also, when an abnormality with a high priority occurs, the update prohibition state of the diagnostic data is temporarily released to forcibly update the diagnostic data of the abnormality with a high priority, and the diagnostic data is updated. Prior to that, the diagnostic data storage system comprises an initialization means for initializing the diagnostic data storage area of the storage means with a value distinguishable from the diagnostic data. 2. The diagnostic data storage system according to claim 1, wherein when the diagnostic data is updated, the data having higher importance is updated in order. 3. The initialization data is initialized in the order of data of lower importance when the diagnostic data storage area of the storage device is initialized by the initialization device.
Or the diagnostic data storage system according to 2. 4. The data update normal termination determining means for determining whether or not the update of the diagnostic data in the storage means has been normally completed up to the last address. The diagnostic data storage system described in 1. 5. If the data update normal end determination means determines that the data update is not normally completed up to the last address, it is equal to or higher than the priority of the abnormality stored in the storage means. 5. The diagnosis according to claim 4, wherein when an abnormality with a higher priority than that occurs, the update prohibition state of the diagnostic data is temporarily released and the diagnostic data is forcibly updated. Data storage system. 6. The data update normal end determination means is normally up to the last address by looking at the data stored at the address where the data update is performed last in the diagnostic data storage area of the storage means. The diagnostic data storage system according to claim 4, wherein it is determined whether or not the process has ended.