JP6930432B2 - Electronic control device - Google Patents

Description

The present disclosure relates to a technique for recording information about a vehicle.

Conventionally, vehicle information representing arbitrary information about a vehicle such as an output value of a sensor mounted on a vehicle or a control value to an actuator is repeatedly acquired, and the acquired vehicle information is sequentially acquired with the passage of time, that is, time. A technique is known in which a series is recorded in a memory.

Patent Document 1 proposes a technique for recording such time-series vehicle information in a memory when a predetermined event occurs in the vehicle.

Japanese Unexamined Patent Publication No. 2013-056589

By the way, when it is assumed that an event occurs a plurality of times in a vehicle, in order to record the time-series vehicle information in detail each time the event occurs, many records for recording the time-series vehicle information are required. It is desirable to allocate the area to the memory in advance. However, the size of the recordable area that can be allocated is limited. Therefore, an area (hereinafter, equally divided area) in which the entire recording area of a predetermined size is equally divided by a predetermined number is set, and time-series vehicle information is recorded in the equally divided area each time an event occurs. It is common practice to let them do it.

However, if the actual number of occurrences of the event is smaller than a predetermined number, an area in which the time-series vehicle information is not recorded occurs in the memory, so that the recording area of the memory cannot be effectively used. Can occur.

One aspect of the present disclosure provides a technique for effectively utilizing a recording area of a predetermined size for recording information about a vehicle.

One aspect of the present disclosure is an electronic control device (10) mounted on a vehicle, which includes an event unit (S10), a cumulative number of times unit (S15), a time series unit (S25), and a recording execution unit (S65). And. The event unit acquires event information indicating that a predetermined event has occurred in the vehicle. The cumulative number part acquires the cumulative number of times that an event has occurred each time event information is acquired. The time-series part acquires the time-series information each time the event information is acquired.

Each time the time-series information is acquired, the recording execution unit collects the time-series information acquired up to the present time in a manner corresponding to the cumulative number of times, and covers the entire area of the information recording unit, which is a recording area of a predetermined size. To record using. The time-series information is information in which a plurality of vehicle information representing the state of the vehicle is arranged in order with the passage of time.

According to such a configuration, the time-series information acquired for each event occurrence is recorded using the entire area of the information recording unit in a manner corresponding to the cumulative number of events that have occurred. It can be effectively used without leaving the recording area of the recording unit.

In addition, the reference numerals in parentheses described in this column and the scope of claims indicate the correspondence with the specific means described in the embodiment described later as one embodiment, and the technical scope of the present disclosure is defined. It is not limited.

The block diagram which shows the structure of the ECU in embodiment. The functional block diagram explaining the function of the ECU. Flowchart of information recording process. Flowchart of selection process. The figure explaining the setting contents of event priority, minimum information amount, occurrence order priority, free space setting information, and time series setting information. The figure which shows the time series setting information. The figure explaining the operation when the first event occurs for the first time. The figure explaining the operation when the second event occurs for the second time. The figure explaining the operation when the 3rd event occurs for the 3rd time. The figure explaining the operation when the 4th event occurs for the 4th time. The figure explaining the operation of the ECU as a comparative example.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.
[1. composition]
The electronic control unit (hereinafter referred to as ECU) 10 shown in FIG. 1 is an engine ECU mounted on a vehicle and for example, performing injection control of an injector, ignition control of a spark plug, and the like. ECU is an abbreviation for Electronic Control Unit.

The ECU 10 includes an input circuit 20, an output circuit 30, a communication circuit 40, and a microcomputer 50. The microcomputer 50 has a CPU 51 and semiconductor memories such as ROM 52, RAM 53, and EEPROM 54.

Various functions of the ECU 10 are realized by the CPU 51 executing a program stored in a non-transitional substantive recording medium. In this example, the ROM 52 corresponds to a non-transitional substantive recording medium in which the program is stored. Moreover, when this program is executed, the method corresponding to the program is executed. The number of microcomputers constituting the ECU 10 is one in the present embodiment, but may be a plurality.

The RAM 53 is a memory used by the program of the ECU 10 for work. The EEPROM 54 is a rewritable non-volatile memory. That is, even if the power supply is cut off from a battery (not shown), the data stored in the EEPROM 54 is saved.

As shown in FIG. 2, the ECU 10 has a recording control unit 61, a vehicle information acquisition unit 62, a vehicle information recording unit 63, and an input / output control unit as a configuration of functions realized by the CPU 51 executing a program. 64, an engine control unit 65, and a service processing unit 66 are provided.

The method for realizing these elements constituting the ECU 10 is not limited to software, and some or all of the elements may be realized by using one or more hardware. For example, when the above function is realized by an electronic circuit which is hardware, the electronic circuit may be realized by a digital circuit including a large number of logic circuits, an analog circuit, or a combination thereof.

(I / O control unit)
The ECU 10 acquires vehicle information to be input via the input circuit 20. The vehicle information is a signal indicating the state of the vehicle, and is input from various sensors, various switches, and the like via the input circuit 20. In the present embodiment, the accelerator opening degree, the throttle opening degree, the crank angle, the engine water temperature, the ignition switch signal and the like are input as vehicle information. The vehicle information is not limited to these. The vehicle information may include any control amount used to control the vehicle, such as a command injection amount for the injector, ignition timing for the spark plug, and the like.

The ECU 10 outputs from the output circuit 30 an injector drive output for driving the injector, an igniter drive output for ignition control of the spark plug, and the like, which are generated by the engine control unit based on the vehicle information.

(Engine control unit)
The ECU 10 generates an injector drive output, an igniter drive output, and the like based on the vehicle information input via the input circuit 20.

(Service processing department)
The ECU 10 outputs the time series information stored in the EEPROM 54 to the external device via the communication circuit 40. The time series information will be described later.

(Recording control unit)
When the ECU 10 detects that a predetermined event has occurred in the vehicle, it outputs event information. The event information is information indicating that a predetermined event has occurred in the vehicle.

The event referred to here refers to a predetermined vehicle operation such as an engine stall, an engine start failure, an abnormal engine water temperature, an accelerator opening of a threshold value or more, and the like. Stall refers to stopping the engine while the vehicle is running. An engine start failure means that the engine does not rotate when the engine is started.

An abnormal engine water temperature, in other words, an engine water temperature equal to or higher than or lower than a predetermined threshold value indicates that the engine may be abnormal. When the accelerator opening is equal to or higher than the threshold value, it means that the electric throttle may not be opened even though the accelerator is depressed.

As such, the event may include the operation of a vehicle that meets preset conditions. Events may include, but are not limited to, vehicle anomalies, and may include the operation of any vehicle. A vehicle abnormality is an abnormal operation of a vehicle that does not occur in normal driving operations.

In addition to the above-mentioned operation of the vehicle, the ECU 10 can detect an arbitrary detection value of the sensor, an arbitrary state of the actuator, or the like as an event. A plurality of types of detected events can be preset. In addition, the priority can be set in advance for the detected event.

In this embodiment, four types of events are detected, such as engine stall, engine start failure, engine water temperature being abnormal, and accelerator opening being equal to or greater than a threshold value. In the following, the engine stall is referred to as a first event, an engine start failure is referred to as a second event, an abnormal engine water temperature is referred to as a third event, and an accelerator opening degree of equal to or greater than a threshold value is referred to as a fourth event. The type of event to be detected is recorded in advance in the ROM 52.

Further, as for the priority of the event, for example, as shown in FIG. 5, the priority of the first event is the highest, such as 1st event> 2nd event = 3rd event> 4th event. It is set. The priority of such an event (hereinafter, event priority) is recorded in advance in the ROM 52.

(Vehicle information acquisition department)
The ECU 10 acquires vehicle information at regular time intervals such as 50 msec and records it in the RAM 53. The data length of the data for representing the vehicle information can be set to an arbitrary predetermined size, for example, 2 bytes.

For example, the ECU 10 records time-series vehicle information in the RAM 53 in a ring buffer format of 8 entries, with each of the vehicle information acquired at regular time intervals as one entry. Time-series information refers to time-series vehicle information. That is, the time-series information refers to vehicle information arranged in order with the passage of time.

When an event occurs, the ECU 10 generates 8-entry time-series information in a predetermined manner according to the event type based on the time-series setting information, and uses the generated 8-entry time-series information as the event type. It is recorded in the RAM 53 together with the information. The event type information is information indicating the type of event that has occurred. The cumulative number of times referred to below is a value indicating the cumulative number of events that have occurred regardless of the type of event. The ECU 10 counts the cumulative number of events each time an event occurs, and stores the cumulative number in the EEPROM 54.

The time-series setting information is information that sets how to generate the time-series information, and is recorded in advance in the ROM 52.
In the present embodiment, the ECU 10 generates 8-entry time-series information and records it in the RAM 53 in an manner corresponding to the type of event based on the time-series setting information as shown in FIG. 6, for example. When generating the time series information of 8 entries, the setting when the cumulative number of events is the first is used. The time-series information of the eight entries is information that is the source of generating the stored information described later.

For example, when the event that occurred is the first event, the ECU 10 has four entries of vehicle information before the event occurs and four entries of vehicle information after the event occurs, based on the time series setting information shown in FIG. The vehicle information of 8 entries including the above is stored in the RAM 53 as time series information.

The ECU 10 generates time-series information so that the event type information is included in each of the vehicle information of one entry included in the vehicle information of these eight entries.

(Vehicle information recording department)
The ECU 10 records the time-series information acquired for each event occurrence by the CPU 51 executing the information recording process, using the entire area of the information storage unit 541 in a manner corresponding to the cumulative number of events that have occurred. do. The information storage unit 541 is a storage area of a predetermined size provided in the EEPROM 54.

In the present embodiment, the size of the information storage unit 541 is equal to the size of the time series information acquired by the vehicle information acquisition unit 62. That is, the size of the information storage unit 541 corresponds to an area of a size capable of recording vehicle information of 8 entries.

[2. process]
[2-1. Information recording processing]
Next, the information recording process executed by the vehicle information recording unit 63 in the ECU 10 will be described with reference to the flowchart of FIG. The information recording process is repeatedly activated at predetermined intervals while the ignition switch signal indicates that the ignition switch is turned on.

In S10, the ECU 10 determines whether or not an event has occurred. Specifically, the ECU 10 determines that an event has occurred when the event information is acquired based on the event information output from the recording control unit 61. The ECU 10 shifts the process to S15 when an event occurs, and ends the information recording process when the event does not occur.

In S15, the ECU 10 acquires the cumulative number of events counted by the vehicle information acquisition unit 62.
In S20, the ECU 10 determines whether or not the cumulative number of times is larger than the preset cumulative upper limit value. The cumulative upper limit is a value that sets the upper limit of the cumulative number of times that an event is expected to occur. In the present embodiment, the cumulative upper limit value is set to 4, and is stored in the ROM 52 in advance. The ECU 10 shifts the process to S25 when the cumulative number of times is equal to or less than the cumulative upper limit value, and ends the information recording process when the cumulative number of times is greater than the cumulative upper limit value.

That is, when the cumulative number of events is larger than the cumulative upper limit value, the ECU 10 does not execute the process of recording the time series information after S25.
In S25, which shifts when the cumulative number of times is equal to or less than the cumulative upper limit value, the ECU 10 acquires eight entries of time series information recorded in the RAM 53 by the vehicle information acquisition unit 62. As described above, each of the vehicle information constituting the eight-entry time-series information includes event type information.

In S30, the ECU 10 acquires the time series setting information recorded in the ROM 52.
In S35, the ECU 10 generates stored information using the eight-entry time-series information newly acquired by S25 based on the time-series setting information. The stored information is information generated based on the time-series information of eight entries newly acquired by S25 when an event occurs, and is information of a size corresponding to a free area described later.

That is, the ECU 10 has one or more of the eight entries of the time-series information newly acquired by S25, in a manner corresponding to the type of event and the cumulative number of events that triggered the acquisition of the time-series information. The stored information is generated by thinning out the vehicle information of. Thinning out as used herein means deleting. The ECU 10 records the generated stored information in the RAM 53.

In the time-series setting information shown in FIG. 6, among the vehicle information constituting the time-series information, the solid line represents the vehicle information to be recorded, and the dotted line represents the vehicle information to be thinned out. Represents.

For example, in the ECU 10, when the generated event is the second event and the cumulative number of times is one, the ECU 10 has eight entries newly acquired by S25 based on the time series setting information shown in FIG. The vehicle information is recorded in the RAM 53 as it is as stored information.

Further, for example, when the generated event is the second event and the cumulative number of times is 2, the ECU 10 has 8 entries newly acquired by S25 based on the time series setting information shown in FIG. Of the vehicle information of the above, the vehicle information of 2 entries before the event occurs and the vehicle information of 2 entries after the event occurs, and the vehicle information of 4 entries in total are recorded in the RAM 53 as stored information.

In S40, the ECU 10 determines whether or not the cumulative number of times is one. The ECU 10 shifts the process to S45 when the cumulative number of times is one, and shifts the process to S50 when the cumulative number of times is two or more.

The ECU 10 sets the entire area of the information storage unit 541 as an empty area in S45, which shifts to the case where the cumulative number of times is one. In the subsequent S65, the ECU 10 records the stored information generated by S35 in the free area set in S45. Then, the ECU 10 ends the information recording process.

According to this, when the cumulative number of times is one, the vehicle information of eight entries is generated as it is as the stored information. Since the information storage unit 541 has a storage area having a size equal to the vehicle information for eight entries, the storage information which is the time-series vehicle information is recorded using the entire area of the information storage unit 541.

In S50 to S65, which shifts when the cumulative number of times is two or more, the ECU 10 uses the entire area of the information storage unit 541 in a manner corresponding to the cumulative number of times for a plurality of time series information acquired up to the present time. Record.

Specifically, the ECU 10 executes the selection process described later in S50. The selection process is a process of selecting one of the time-series information already recorded in the information storage unit 541.
The ECU 10 acquires selection information in S55. The selection information refers to one of the time-series information already recorded in the information storage unit 541 selected by S50.

In S60, the ECU 10 creates an empty area in the area in which the selection information is recorded in the information storage unit 541. The size of the free space to be generated is preset by the free space setting information. As shown in FIG. 5, for example, the free area setting information sets the size of the free area to be generated according to the cumulative number of times, and is recorded in advance in the ROM 52.

The ECU 10 first generates thinning information. The thinning information is information obtained by thinning out at least one entry of vehicle information from the selection information. Based on the time-series setting information, the ECU 10 generates information obtained by thinning out vehicle information for the free area set by the free area setting information from the selection information as thinning information. That is, the thinning information is generated in a manner corresponding to the type of event and the cumulative number of times.

Subsequently, the ECU 10 re-records the thinning information as a new time series in the written area. The written area is an area in which selection information is recorded in the information storage unit 541. Since the written area is larger than the recording area required for the thinning information recorded as new time series information, a free area is generated in the written area. The free area is an area in the written area in which thinning information is not recorded.

In this way, the ECU 10 creates an empty area in the written area.
In S65, the ECU 10 records the stored information generated in S35 in the empty area generated in S60. Then, the ECU 10 ends the information recording process.

[2-2. Selection process]
Next, the selection process executed in S50 of the information recording process will be described with reference to the flowchart of FIG.

In S100, the ECU 10 acquires the event priority from the ROM 52. Then, the ECU 10 selects one of the time-series information already recorded in the information storage unit 541 according to the event priority of the event that triggered the acquisition of the time-series information. Here, the ECU 10 preferentially selects an event having a lower priority.

In S110, the ECU 10 determines in S100 whether or not a plurality of time-series information having the lowest event priority among the time-series information already recorded in the information storage unit 541 is selected. The ECU 10 shifts the process to S120 when a plurality of time series information having the lowest priority is selected, and shifts the process to S130 when one time series information having the lowest priority is selected.

In S120, the ECU 10 sets one of a plurality of time-series information, which is the lowest priority of the time-series information already recorded, into the event occurrence order that triggered the acquisition of the time-series information. Select according to. The occurrence order setting information is represented here so as to give priority to the oldest event occurrence order, and is recorded in advance in the ROM 52. The ECU 10 preferentially selects the event with the oldest occurrence order based on the occurrence order setting information.

As a result, even if a plurality of time-series information having the lowest priority among the time-series information already recorded in the information storage unit 541 is selected in S100, the time-series information to be selected in this step. Is uniquely determined based on the order in which the events occur.

In S130, the ECU 10 determines whether or not the amount of time-series information uniquely selected by S100 to S120 is the minimum amount of information. The minimum amount of information referred to here means the minimum amount of information that should be recorded as time-series information in the information storage unit 541.

The minimum amount of information can be preset to a different value depending on the type of event that triggered the recording of the time series information. Further, the minimum amount of information can be set to the same value in advance regardless of the type of event that triggered the recording of the time series information. In this embodiment, as shown in FIG. 5, the minimum amount of information is set to two entries, which are the same values for all events.

The minimum amount of information corresponds to the size obtained by dividing the entire recording area of the information storage unit 541 by the cumulative upper limit value. The minimum amount of information is stored in the ROM 52 in advance.
Here, when the amount of information of the selected time-series information is larger than the minimum amount of information, the ECU 10 shifts the processing to S140. In S140, the ECU 10 specifies the selected time series information as selection information and stores it in the RAM 53. Then, the final selection process is terminated.

On the other hand, when the information amount of the selected time series information is the minimum information amount, the ECU 10 shifts the processing to S100 and executes the processing of S100 to S130. That is, the ECU 10 reselects the time series information.

The time-series information specified as the selection information in this selection process is the information that is the source of generating the thinning information. That is, according to S130, when the time-series information selected in S110 or S120 is the minimum amount of information, by reselecting the time-series information, the information storage unit 541 is provided with information equal to or greater than the minimum amount of information. Amount of time series information will be recorded.

[3. Operation]
The operation of the ECU 10 configured in this way will be described with reference to FIGS. 7 to 10.
First, a case where the first event occurs as the first event will be described. As shown in FIG. 7, it is assumed that the first event occurs in S201. In S202, the vehicle information acquisition unit 62 acquires the vehicle information “9” based on the time series setting information, and then generates eight entries of vehicle information as time series information and records it in the RAM 53. The eight-entry vehicle information referred to here refers to vehicle information "2" to "9" which are four-entry vehicle information before and after the occurrence of the first event.

In S203, since the cumulative number of times is the first, the vehicle information recording unit 63 sets eight entries of vehicle information as storage information based on the time series setting information. Further, the vehicle information recording unit 63 sets the entire area of the information storage unit 541 for eight entries as a free area, and uses the time series information of the eight entries acquired as a trigger of the occurrence of the first event as the storage information as it is in the free area. It is recorded in the entire area of the information storage unit 541.

As a result, in S204, the stored information, which is time-series information, is recorded in the information storage unit 541 without leaving a storage area.
Next, a case where the second event occurs as the second event will be described. As shown in FIG. 8, it is assumed that the second event occurs in S205. In S206, the vehicle information acquisition unit 62 acquires the vehicle information "18" based on the time series setting information, and then generates eight entries of vehicle information as time series information and records it in the RAM 53. The 8-entry vehicle information referred to here refers to vehicle information "11" to "18", which is vehicle information of 4 entries before and after the occurrence of the second event.

In S207, vehicle information "2" to "9", which are time-series information already stored in the vehicle information recording unit 63 and the information storage unit 541, are specified as selection information.
In S208, the vehicle information recording unit 63 generates thinning information based on the selection information based on the free area setting information and the time series setting information. That is, the vehicle information recording unit 63 creates free space for four entries as shown in the free space setting information when the cumulative number of times is two. Specifically, the vehicle information recording unit 63 includes the "first event" in the time-series setting information shown in FIG. 6 among the vehicle information "2" to "9" acquired in the wake of the first event. As shown in the second cumulative number of times, the vehicle information is thinned out every other time, and the vehicle information "3", "5", "7", and "9" are generated as the thinned out information. Then, the vehicle information recording unit 63 records the thinning information as new time-series information in the written area, and creates a free area for four entries.

In S209, the vehicle information recording unit 63 generates stored information based on the vehicle information "11" to "18" of eight entries based on the time series information. Specifically, the ECU 10 is the second cumulative number of times of the "second event" in the time series setting information shown in FIG. 6 among the vehicle information "11" to "18" acquired in the wake of the second event. As shown in, vehicle information other than 4 entries, which is a total of 2 entries before and after the event occurs, is thinned out, and vehicle information "13", "14", "15", and "16" are generated as stored information. Then, the stored information is recorded in the free area.

As a result, in S210, the time-series information acquired up to the present time is recorded in the information storage unit 541 without leaving a storage area. The time-series information acquired up to this point here is the vehicle information "3", "5", "7", "9" acquired in the wake of the first event, and the time-series information acquired in the wake of the second event. The vehicle information is "13", "14", "15", and "16".

Next, a case where the third event occurs as the third event will be described. As shown in FIG. 9, it is assumed that the third event occurs in S211. In S212, the vehicle information acquisition unit 62 records eight entries of vehicle information as time-series information in the RAM 53 after acquiring the vehicle information “28” based on the time-series setting information. The eight-entry vehicle information referred to here refers to vehicle information "21" to "28", which is four-entry vehicle information before and after the occurrence of the third event.

In S213, the vehicle information recording unit 63 includes vehicle information "3", "5", "7", "9" already stored in the information storage unit 541, and vehicle information "13", "14", "15", "16". Among them, the vehicle information "13", "14", "15", and "16" triggered by the second event having the lower event priority is specified as the selection information.

In S214, the vehicle information recording unit 63 generates thinning information based on the selection information based on the free area setting information and the time series setting information. That is, the vehicle information recording unit 63 creates free space for two entries as shown in the free space setting information when the cumulative number of times is three. Specifically, the vehicle information recording unit 63 has the "third" in the time series setting information shown in FIG. 6 among the vehicle information "13", "14", "15", and "16" acquired in the wake of the second event. As shown in the third cumulative number of "2 events", vehicle information other than 2 entries, which is a total of 1 entry before and after the event occurs, is thinned out, and vehicle information "14" and "15" are generated as thinned out information. .. Then, in S215, the vehicle information recording unit 63 records the thinning information as new time-series information in the written area, and creates a free area for two entries.

In S216, the vehicle information recording unit 63 generates stored information based on the vehicle information "21" to "28" of eight entries based on the time series information. Specifically, the vehicle information recording unit 63 has the vehicle information "21" to "28" acquired in the wake of the third event, and the vehicle information recording unit 63 has the "third event" in the time series setting information shown in FIG. As shown in the third cumulative number of times, vehicle information other than the two entries before the event occurs is thinned out, and vehicle information "23" and "24" are generated as stored information. Then, the vehicle information recording unit 63 records the stored information in the free area.

As a result, in S217, the time-series information acquired up to the present time is recorded in the information storage unit 541 without leaving a storage area. The time-series information acquired up to this point here is the vehicle information "3", "5", "7", "9" acquired in the wake of the first event, and the time-series information acquired in the wake of the second event. The vehicle information "14" and "15" and the vehicle information "23" and "24" acquired in the wake of the third event.

Next, a case where the fourth event occurs as the fourth event will be described. As shown in FIG. 10, it is assumed that the fourth event occurs in S218. In S219, the vehicle information acquisition unit 62 acquires the vehicle information “35” based on the time series setting information, and then the vehicle information acquisition unit 62 records eight entries of vehicle information as time series information in the RAM 53. The eight-entry vehicle information referred to here refers to vehicle information "28" to "35", which is eight-entry vehicle information before the occurrence of the fourth event.

In S220, the vehicle information recording unit 63 includes vehicle information "3", "5", "7", "9", vehicle information "14", "15", and vehicle information "23", "23", which are already stored in the information storage unit 541. Of "24", vehicle information "3", "5", "7", and "9" are specified as selection information.

Specifically, the vehicle information recording unit 63 first obtains vehicle information "14" and "15" triggered by the second event and a third event, which have the same priority, based on the event priority. Select the vehicle information "23" and "24" to be the trigger. Next, the vehicle information recording unit 63 selects vehicle information "14" and "15" triggered by the second event, which has an old occurrence order, based on the occurrence order setting.

Here, since the vehicle information "14" and "15" are information for two entries, which is the minimum amount of information, the vehicle information recording unit 63 uses the vehicle information "23" and "24" triggered by the third event. select. However, since the vehicle information "23" and "24" are also information for two entries, which is the minimum amount of information, the vehicle information recording unit 63 uses the vehicle information "3", "5", "7", and "9" as selection information. Identify.

In S221, the vehicle information recording unit 63 generates thinning information based on the selection information based on the free area setting information and the time series setting information. That is, the vehicle information recording unit 63 creates free space for two entries as shown in the free space setting information when the cumulative number of times is four. Specifically, the vehicle information recording unit 63 has the "third" in the time series setting information shown in FIG. 6 among the vehicle information "3", "5", "7", and "9" acquired in the wake of the first event. Vehicle information is thinned out as shown in the fourth cumulative number of times of "1 event", and vehicle information "5" and "9" are generated as thinning out information. Then, in S222, the vehicle information recording unit 63 records the thinning information as new time-series information in the written area, and creates a free area for two entries.

In S223, the ECU 10 generates stored information based on the vehicle information "28" to "35" of 8 entries based on the time series information. Specifically, the ECU 10 is the fourth cumulative number of times of the "fourth event" in the time series setting information shown in FIG. 6 among the vehicle information "28" to "35" acquired in the wake of the fourth event. The vehicle information is thinned out as shown in the above, and the vehicle information "28" and "29" are generated as the stored information. Then, the stored information is recorded in the free area.

As a result, in S224, the time-series information acquired up to the present time is recorded in the information storage unit 541 without leaving a storage area. The time-series information acquired up to this point here is the vehicle information "5" and "9" acquired in the wake of the first event and the vehicle information "14" acquired in the wake of the second event. These are "15", vehicle information "23" and "24" acquired in the wake of the third event, and vehicle information "28" and "29" acquired in the wake of the fourth event.

In this way, the ECU 10 records the time-series information acquired up to the present time in the information storage unit 541 of the EEPROM 54 without leaving a storage area. As a result, when the cumulative number of times is less than the upper limit threshold value, the time series information can be recorded with an amount of information larger than the minimum amount of information.

Here, the operation of the ECU as a comparative example is shown in FIG. It is assumed that the first event occurs in S301. The ECU as a comparative example is configured in S302 to record time-series information having a size predetermined to a minimum amount of information in advance, such as for two entries, in the RAM. Then, in S303, time-series information having a size determined by the minimum amount of information is recorded in the information storage unit 541. As a result, in S304, there is an unused storage area for 6 entries in the information storage unit 541.

When the cumulative number of times is less than the upper limit threshold value, the ECU 10 of the present embodiment can record time series information in more detail than the ECU as a comparative example as shown in FIG.
[4. effect]
According to the embodiment described in detail above, the following effects are obtained.

(4a) In S10, the ECU 10 acquires event information indicating that a predetermined event has occurred in the vehicle. In S15, the ECU 10 acquires the cumulative number of times the event has occurred each time the event information is acquired. In S25, the ECU 10 acquires time-series information each time event information is acquired.

In S65, the ECU 10 stores at least one time-series information acquired by S25 up to the present time in a recording area having a predetermined size in a mode according to the cumulative number of times, each time the time-series information is acquired. Recording is performed using the entire area of a certain information storage unit 541. The time-series information is information in which a plurality of predetermined vehicle information representing the state of the vehicle is arranged in order with the passage of time.

According to this, since the time series information acquired up to the present time is recorded by using the entire area of the information storage unit 541 in an manner according to the cumulative number of times, the recording area in the information storage unit 541 is provided. It can be used effectively without leaving any residue.

(4b) In S45, the ECU 10 causes the time series information acquired by S25 to be recorded using the entire area of the information storage unit 541 when the cumulative number of times is one.
According to this, even when the cumulative number of times is one, the recording area in the information storage unit 541 can be effectively used without being left over.

(4c) In S50, the ECU 10 selects one of the time-series information already recorded in the information storage unit 541 when the cumulative number of times is two or more. In S55, the ECU 10 acquires selection information which is time-series information selected by S50. In S60, the ECU 10 generates thinning information obtained by thinning out at least one vehicle information from the selection information, and newly thins out the thinning information in the written area which is the area in which the selection information is recorded in the information storage unit 541. It is re-recorded as time-series information, and a free area, which is an area in which thinning information is not recorded, is generated in the written area. In S35, the ECU 10 uses the time-series information newly acquired by S25 to generate storage information having a size corresponding to the free area. In S65, the ECU 10 causes the stored information to be recorded in an empty area.

According to this, when the cumulative number of times is two or more, the ECU 10 re-records the thinning information based on the time-series information in the area where the time-series information is already recorded to generate a free area, and is free. Have the area record the newly acquired time series information. Therefore, even when the cumulative number of times is two or more, a plurality of time series information is recorded using the entire area in the information storage unit 541. As a result, the recording area in the information storage unit 541 can be effectively used.

(4d) In S50, the ECU 10 selects one of the time-series information already recorded in the information storage unit 541 according to the priority of the event that triggered the acquisition of the time-series information.

According to this, for example, if the ECU 10 is configured to select the time-series information acquired according to the event with the lowest priority among the time-series information already recorded in the information storage unit 541, the priority is given. Thinning information is generated for the time series information with the lowest degree. That is, the time-series information having a high priority can be recorded with a larger amount of information than the time-series information having a low priority.

(4e) In S50, the ECU 10 selects one of the time-series information already recorded in the information storage unit 541 according to the order of occurrence of the event that triggered the acquisition of the time-series information. In the present embodiment, the one with the oldest event occurrence order is preferentially selected.

According to this, for example, when there are a plurality of events having the lowest priority among the time-series information already recorded in the information storage unit 541, the ECU 10 selects the event having the latest event occurrence order among them. The selection information can be uniquely determined, such as selecting as the selection information.

[5. Other embodiments]
Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and can be implemented in various modifications.

(5a) In the above embodiment, there are four types of events that trigger the acquisition of time-series information, but the event is not limited to this. For example, the number of event types may be arbitrary, such as two types, three types, five or more types, and the like.

(5b) In the above embodiment, the cumulative upper limit is set to 4, but the cumulative upper limit is not limited to this. The cumulative upper limit may be any number of 2 or more. If the cumulative upper limit is set to 2, it is not necessary to set the event priority and the occurrence order priority as shown in FIG. 5 in the above embodiment.

(5c) In the above embodiment, the time-series information acquired in S25 is vehicle information for eight entries. Then, a storage area having the same size as the amount of information of the time-series information was assigned as the information storage unit 541 in the EEPROM 54. However, the present invention is not limited to this. The time-series information acquired in S25 may have an arbitrary size equal to or larger than the entire area of the information storage unit 541.

(5d) In the above embodiment, the ECU 10 triggers the acquisition of one of the time-series information already recorded in the information storage unit 541 in the selection process executed in S50. The selection was made according to the priority of the event and the order in which the events occurred, but the selection is not limited to this. For example, the ECU 10 may select one of the time-series information already recorded in the information storage unit 541 in the selection process executed in S50 according to only the event occurrence order.

The ECU 10 may preferentially specify the event with the oldest event occurrence order as selection information. Further, the ECU 10 may preferentially specify a new event occurrence order as selection information. Thereby, the selection information can be uniquely specified.

(5e) In the above embodiment, the ECU 10 has a configuration in which a free area is generated in the written area and the stored information is recorded in the free area when the cumulative number of times is two or more. It is not limited to. The ECU 10 does not have to have this configuration. That is, the ECU 10 may have only a configuration in which the time series information acquired by S25 is recorded using the entire area of the information storage unit 541 when the cumulative number of times is one.

(5f) A plurality of functions possessed by one component in the above embodiment may be realized by a plurality of components, or one function possessed by one component may be realized by a plurality of components. .. Further, a plurality of functions possessed by the plurality of components may be realized by one component, or one function realized by the plurality of components may be realized by one component. Further, a part of the configuration of the above embodiment may be omitted. In addition, at least a part of the configuration of the above embodiment may be added or replaced with the configuration of the other above embodiment. It should be noted that all aspects included in the technical idea specified from the wording described in the claims are embodiments of the present disclosure.

(5g) In addition to the above-mentioned ECU 10, microcomputer 50, and CPU 51, the present disclosure is made in various forms such as a program for operating the CPU 51, a non-transitional actual recording medium such as a semiconductor memory in which this program is recorded, and an information recording method. Can also be realized.

[6. Correspondence between claims and embodiments]
The ECU 10 corresponds to an event unit, a cumulative number of times unit, a time series unit, a storage information unit, an initial recording unit, a selection unit, a selection information unit, a free area generation unit, a recording execution unit, and a plurality of recording units. The information storage unit 541 corresponds to the information recording unit.

Further, S10 corresponds to the processing as the event part, S15 corresponds to the processing as the cumulative number of times part, S25 corresponds to the processing as the time series part, S35 corresponds to the processing as the storage information part, and S45. Corresponds to the processing as the initial recording unit. S50 corresponds to the processing as the selection unit, S55 corresponds to the processing as the selection information unit, S60 corresponds to the processing as the free area generation unit, and S65 corresponds to the processing as the recording execution unit and the plurality of recording units. do.

10 ECU, 541 Information storage unit.

Claims (6)

An electronic control device (10) mounted on a vehicle.
An event unit (S10) for acquiring event information indicating that a predetermined event has occurred in the vehicle, and
Every time the event information is obtained, the cumulative number of times unit that acquires the cumulative number of times the event occurred and (S15),
Each time the event information is acquired, the time-series portion (S25) for acquiring the time-series information and
Each time the time-series information is acquired, at least one of the time-series information acquired up to the present time is stored in an information recording unit (a recording area having a predetermined size) in a manner corresponding to the cumulative number of times. A recording execution unit (S65) for recording using the entire area of 541), and
With
The time-series information, vehicle information indicating a state of the vehicle is Ri turn more ordered information der over time,
The recording execution unit is the size of the free area to be generated according to the cumulative number of times in the area of the information recording unit in which the selection information selected from the time series information that has already been recorded is recorded. Based on the free area setting information in which the setting is made, information obtained by thinning out the vehicle information for the free area from the selection information is generated as thinning information and re-recorded in the area to generate a new free area. An electronic control device that generates storage information having a size corresponding to the cumulative number of times from the time-series information acquired in the above and stores it in the free area. The electronic control device according to claim 1.
When the recording execution unit stores at least one time-series information acquired up to the present time in the information recording unit, the recording execution unit accumulates the size of each of the one or more time-series information acquired up to the present time. An electronic control device that adjusts according to the number of times and makes the overall size of the time-series information stored in the information recording unit match the size of the entire area of the information recording unit. The electronic control device according to claim 1 or 2.
The recording execution unit
Initial recording unit (S45) for recording the time-series information acquired by the time-series unit using the entire area of the information recording unit when the cumulative number of times is one according to the cumulative number of times.
Electronic control device with. The electronic control device according to any one of claims 1 to 3.
The recording execution unit
A selection unit (S50) that selects one of the time-series information already recorded in the information recording unit when the cumulative number of times is two or more according to the cumulative number of times.
Selection information unit that obtains the selection information which is the time-series information selected by the selection section and (S55),
Generates the thinning information is thinned out at least one of the vehicle information from the selection information, the information when the write completion area the selection information in the recording unit is a region which is recorded a new said thinning information sequence re-recorded as the information, the document Komisumi said vacant area generation unit to generate a free area is an area in which the thinning information is not recorded in the area and (S60),
The time based on the time-series information newly acquired by the sequence unit, storage information unit configured to generate the storage information is the size information of in accordance with the free space and (S35),
A plurality of recording units (S65) for recording the stored information in the free area, and
An electronic control device comprising. The electronic control device according to claim 4.
The event is composed of a plurality of predetermined types, and the priority is predetermined according to the type of the event.
The selection unit is an electronic control device that selects one of the already recorded time-series information according to the priority of the event that triggered the acquisition of the time-series information. The electronic control device according to claim 4 or 5.
The selection unit is an electronic control device that selects one of the already recorded time-series information according to the order of occurrence of the event that triggered the acquisition of the time-series information.

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