JP7183205B2 - electronic controller - Google Patents

Description

The present invention relates to an electronic control device mounted on a vehicle, for example.

2. Description of the Related Art Conventionally, an electronic control unit such as an ECU (Electric Control Unit) mounted on a vehicle has a clock IC mounted thereon. This clock IC manages time in units of time elements such as year, month, day, hour, minute, and second, and has a different data area for each time element. Also, such a clock IC is used, for example, to measure the soak time from when the engine is stopped to when it is started.

Patent document 1 has a microcomputer mounted on an ECU that operates or stops depending on the power supply state associated with switching of an IG switch, and a clock IC that continuously measures time regardless of whether the microcomputer operates or stops. As for an electronic control unit, a configuration is disclosed in which a microcomputer determines failure of a water temperature sensor based on a soak time calculated from time data of a clock IC and a detection value of the water temperature sensor when an engine is started.

As such a conventional electronic control device, there is one that detects failure of the clock IC. A conventional clock IC failure detection method measures a reference time in a microcomputer communicating with the clock IC, compares the time measured by the clock IC with the reference time measured by the microcomputer, and determines whether there is an error in the comparison result. If it is out of the predetermined range, a malfunction of the clock IC is detected.

JP-A-2002-14726

However, according to the study of the present inventor, when an abnormality such as a failure occurs in a part of the time element in the clock IC or the like, the abnormality can be detected because each time element has a data area. An abnormality cannot be detected depending on the timing. For example, when an abnormality occurs in some time elements, the abnormality cannot be detected if the time element causing the abnormality is not updated before the abnormality is detected.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electronic control device capable of accurately detecting an abnormality occurring in a timekeeping section.

In order to achieve the above objects, the present invention provides a timekeeping unit for executing a first timekeeping process for keeping time, and a second timekeeping process for keeping time independently of the timekeeping unit, and a control unit that detects an abnormality of the time measuring unit based on a comparison between the time measuring result of the second time measuring process and the time measuring result of the first time measuring process, wherein the control unit performs a wait process of rewriting the time data of the timekeeping unit into test time data that can update all time elements of the time data within a predetermined time, and causing the timekeeping unit to execute the first timekeeping process; Based on the result of comparison between the time measured by the second timekeeping process when the predetermined time has elapsed from the start of the wait process and the time measured by the first timekeeping process in the timekeeping unit, the timekeeping is performed. A first aspect is to execute an abnormality detection process for detecting an abnormality in a part.

In addition to the first aspect of the present invention, the control unit reads and stores the time data of the clock unit before being rewritten to the test time data in the wait process, and in the abnormality detection process When the timekeeping unit is normal, when the predetermined time has passed since the start of the wait process, the current time data of the current time obtained by adding the predetermined time to the time of the stored time data is stored in the timekeeping unit. A second phase is to write back to .

According to the electronic control device according to the first aspect of the present invention, the timekeeping section that performs the first timekeeping process for keeping time and the second timekeeping process that keeps time independently of the timekeeping section are executed. and a control unit that detects an abnormality of the time measuring unit based on a comparison between the result of time measurement by the second time measurement process and the result of time measurement by the first time measurement process, the control unit comprising: , rewrites the time data of the timekeeping unit to test time data that can update all time elements of the time data within a predetermined time, executes wait processing for causing the timekeeping unit to execute the first timekeeping processing, and when the wait processing is started Execute an abnormality detection process for detecting an abnormality in the clock unit based on the comparison result between the time clocked by the second clock processing and the time clocked by the clock unit by the first clock processing when a predetermined time has elapsed since Therefore, it is possible to accurately detect an abnormality occurring in the clock section.

Further, according to the electronic control device according to the second aspect of the present invention, the control unit reads out and stores the time data of the timekeeping unit before being rewritten to the test time data in the wait process, and stores the time data in the timekeeping unit in the abnormality detection process. is normal, when the predetermined time has passed since the start of the wait process, the current time data obtained by adding the predetermined time to the time of the stored time data is written back to the clock unit. When executing the abnormality detection process, it is possible to cause the timekeeping unit to continuously keep accurate current time.

FIG. 1 is a block diagram showing the configuration of an electronic control unit according to an embodiment of the invention. FIG. 2 is a flow diagram showing the operation of the electronic control unit according to the embodiment of the invention. FIG. 3 is a diagram showing an example of the flow of rewriting processing to test time data executed by the electronic control unit according to the embodiment of the present invention. FIG. 4 is a flowchart showing a timepiece IC control process executed by the electronic control device according to the embodiment of the invention. FIG. 5 is a timing chart showing an example of the flow of timepiece IC control processing executed by the electronic control device according to the embodiment of the present invention.

Hereinafter, an electronic control device according to an embodiment of the present invention will be described in detail with reference to the drawings as appropriate.

<Configuration of electronic control unit>
The configuration of the electronic control unit according to the present embodiment will be described in detail with reference to FIG.

FIG. 1 is a block diagram showing the configuration of an electronic control unit according to this embodiment.

As shown in FIG. 1, an electronic control unit 1 in this embodiment is mounted on a vehicle (not shown), typically a motorcycle, and is composed of an ECU (Electric Control Unit) and the like. The electronic control unit 1 is supplied with power from the battery 2 through the sub-power supply 3 and is also supplied with power from the battery 2 through the main power supply 4 when the ignition switch 5 is on.

Specifically, the electronic control unit 1 includes a sub power supply IC 11 , a main power supply IC 12 , a clock IC 13 and a microcomputer 14 .

The sub-power supply IC 11 converts the power supplied from the sub-power supply 3 into power having a predetermined voltage value and current value, and supplies the power to the clock IC 13 .

The main power supply IC 12 converts the power supplied from the main power supply 4 into power having a predetermined voltage value and current value, and supplies the power to the microcomputer 14 .

The clock IC 13 as a clocking unit is constantly supplied with power from the battery 2 via the sub power supply IC 11, and is driven by receiving the power supply from the sub power supply IC 11 to perform a clocking process (second clocking process). 1) is executed. The clock IC 13 executes timing processing under the control of the microcomputer 14, for example, clocks the soak time from when the engine as an internal combustion engine (not shown) is stopped to when it is next started.

A microcomputer 14 as a control unit is driven by power supply from the main power supply IC 12 when the ignition switch 5 is on, and controls the overall operation of the electronic control unit 1 . The microcomputer 14 controls the timing process executed by the clock IC 13 by communicating with the clock IC 13 . The microcomputer 14 executes timekeeping processing (second timekeeping processing) for keeping a reference time independently of the clock IC 13 .

When a rewrite request for detecting an abnormality in the clock IC 13 is generated, the microcomputer 14 rewrites the time data of the clock IC 13 to test time data, causes the clock IC 13 to perform the timekeeping process, and causes the clock IC 13 to perform the timekeeping process. An abnormality detection process for detecting an abnormality in the clock IC 13 is performed based on a comparison between the result of the process executed and the result of the clocking process of the reference time clocked by the microcomputer 14 . Here, the test time data is time data that can update all the time elements of the time data within a predetermined time.

The microcomputer 14 always generates an initialization request while the engine is running, and when a rewrite request is generated, rewrites the time data of the clock IC 13 to the initialization time data, and causes the clock IC 13 to count the soak time. . Here, the initialization time data is, for example, data indicating 00:00:00 on January 01, 00, but is not limited to data indicating any year, month, day, hour, minute, and second. can do.

The electronic control unit 1 having such a configuration performs the operation described below to detect an abnormality of the clock IC 13 with high precision. The operation of the electronic control unit 1 will be described below with reference to FIGS. 2 and 3 as well.

<Operation of electronic control unit>
FIG. 2 is a flow chart showing the operation of the electronic control unit according to the embodiment of the invention. FIG. 3 is a diagram showing an example of the flow of rewriting processing to test time data executed by the electronic control unit according to the embodiment of the present invention.

In the operation shown in FIG. 2, the ignition switch 5 of the vehicle is turned on, power is supplied from the battery 2 to the electronic control unit 1, the microcomputer 14 of the electronic control unit 1 is activated, and the microcomputer 14 operates the clock IC 13. It starts at the timing of receiving a request to rewrite the time data for detecting an abnormality, and proceeds to the operation of step S1. The operation shown in FIG. 2 is executed once each time the vehicle is started and the microcomputer 14 is started.

In the operation of step S1, the microcomputer 14 starts communicating with the clock IC 13, reads the time measured by the clock IC 13, saves the read time in a memory (not shown), and stores the read time. Execute the process. For example, as shown in FIG. 3, the microcomputer 14 reads the time being measured for each time element and saves it in memory. Here, the time element refers to each of year, month, day, hour, minute and second. Thereby, the operation of step S1 is completed, and the electronic control unit 1 proceeds to the operation of step S2.

In the operation of step S2, the microcomputer 14 executes time rewrite processing for rewriting test time data. The microcomputer 14, for example, as shown in FIG. Rewrite the test time data as follows. Thereby, the operation of step S2 is completed, and the electronic control unit 1 proceeds to the operation of step S3. Note that the clock IC control processing, which is processing when the ignition switch 5 is turned off during execution of this time rewriting processing, will be described later. Moreover, the test time data is not limited to the above data, and can be any data that can update all the time elements of the time data within a predetermined period of time.

In the operation of step S3, the microcomputer 14 executes WAIT processing (wait processing) to wait until a predetermined time elapses from the end of the operation of step S2, and the microcomputer 14 also executes clocking processing of clocking the reference time. Here, the predetermined time is the time at which all the time elements of the time data are updated. For example, as shown in FIG. 3, the microcomputer 14 executes a WAIT process to wait until 100 seconds have elapsed from Dec. 31, 1979, 23:59:00. The test time data becomes 00:00:40 on Jan. 1, 1980 when 100 seconds have passed, and all the time elements are changed. Thereby, the operation of step S3 is completed, and the electronic control unit 1 proceeds to the operation of step S4.

In the operation of step S4, the microcomputer 14 executes a time reading process for reading time data of the time kept by the clock IC 13. FIG. Thereby, the operation of step S4 is completed, and the electronic control unit 1 proceeds to the operation of step S5.

In the operation of step S5, the microcomputer 14 performs comparison processing for comparing the time of the time data read out from the clock IC 13 by the operation of step S4 and the reference time kept by the microcomputer 14. FIG. As a result, the operation of step S5 is completed, and the electronic control unit 1 proceeds to the operation of step S6.

In the operation of step S6, the microcomputer 14 determines whether the data of all time elements are normal. As a result of determination, if the data of all the time elements are normal, the microcomputer 14 proceeds to the operation of step S7. On the other hand, if there is an abnormality in some or all of the time element data, the microcomputer 14 proceeds to step S8. For example, if the time of the time data read out from the clock IC and the reference time kept by the microcomputer 14 match Jan. 1, 1980, 00:00:40, the microcomputer 14 executes step S7. If they do not match, the process proceeds to step S8.

In the operation of step S7, the microcomputer 14 determines that the clock IC 13 is normal. Thereby, the operation of step S7 is completed, and the electronic control unit 1 proceeds to the operation of step S9.

In the operation of step S8, the microcomputer 14 determines that the clock IC 13 is abnormal. As a result, the operation of step S8 is completed, and the electronic control unit 1 ends its operation.

The microcomputer 14 executes an abnormality detection process for detecting an abnormality of the clock IC 13 by performing the operations from step S1 to step S8.

In the operation of step S9, the microcomputer 14 calculates the current time by adding the predetermined time (measured time) elapsed in the WAIT process of step S3 to the save time at which the time data was stored in the memory in step S1. A time write-back process is executed to write back the current time data of the current time to the clock IC 13 . For example, as shown in FIG. 3, the microcomputer 14 calculates the current time by adding 100 seconds to the time data stored in the memory in step S1. As a result, the operation of step S9 is completed, and the electronic control unit 1 ends its operation.

In this way, the electronic control unit 1 can detect an abnormality for each time element in the same amount of time as it takes to detect an abnormality in the conventional clock IC 13 . In addition, since the electronic control unit 1 can prevent data loss of the time data in the clock IC 13, it is also possible to use the clock IC 13 to accurately integrate the operation time of the engine or notify the maintenance cycle.

The electronic control unit 1 that operates as described above executes the following timepiece IC control processing. The clock IC control process will be described below with reference to FIGS. 4 and 5 as well.

<Clock IC control processing>
FIG. 4 is a flow chart showing the timepiece IC control processing executed by the electronic control device according to the embodiment of the present invention. FIG. 5 is a timing chart showing an example of the flow of timepiece IC control processing executed by the electronic control device according to the embodiment of the present invention. Note that FIG. 5 illustrates a case where the connection between the clock IC 13 and the microcomputer 14 is cut off during rewriting of seconds in the time rewriting process.

The timepiece IC control process shown in FIG. 4 is executed in the self-shutdown process that starts when the ignition switch 5 is turned off, and the timepiece IC control process proceeds to step S21. The clock IC control process shown in FIG. 4 is repeatedly executed at predetermined control cycles while the electronic control unit 1 is in operation.

In the process of step S21, the microcomputer 14 determines whether or not control of the clock IC 13 is permitted. As a result of the determination, when the control of the clock IC 13 is permitted, the microcomputer 14 advances the clock IC control processing to the processing of step S22. On the other hand, if the control of the clock IC 13 is not permitted, the microcomputer 14 terminates the clock IC control processing.

In the processing of step S22, the microcomputer 14 determines whether or not there is a request for initialization of the clock IC 13, which always occurs while the engine (not shown) is running. As a result of the determination, if there is a request for initialization of the clock IC 13, the microcomputer 14 advances the clock IC control process to the process of step S23. On the other hand, if there is no request for initialization of the clock IC 13, the microcomputer 14 advances the clock IC control process to step S23.

In the process of step S23, the microcomputer 14 determines whether there is a request to rewrite the initialization time data based on the request flag F_CMDTXRTD for requesting rewriting to the initialization time data. As a result of determination, if there is a request to rewrite the initialization time data (if the request flag F_CMDTXRTD is set), the microcomputer 14 advances the clock IC control process to step S24. On the other hand, if there is no request to rewrite the initialized time data (if the request flag F_CMDTXRTD is not set), the microcomputer 14 terminates the clock IC control process.

In the process of step S24, the microcomputer 14 communicates with the clock IC 13 to execute the time rewrite process, and rewrites the time data of the clock IC 13 to the initialized time data. Thus, the process of step S24 is completed, and the clock IC control process ends.

Even if the ignition switch 5 is turned off and the communication with the clock IC 13 is cut off during the time rewriting process in the process of step S24, the microcomputer 14 restores the initialized time data in the process of step S23. (because the request flag F_CMDTXRTD is set), in the self-shutdown process after the ignition switch 5 is turned off, the execution of the rewriting process to the initialization time data is started again from the beginning.

Specifically, at time t=t1 shown in FIG. 5, the ignition switch 5 is turned off during the time rewriting process, whereby the microcomputer 14 ends the time rewriting process and starts the self-shutdown process.

Between times t=t1 and t=t2, the microcomputer 14 determines in the process of step S23 that there is a request to rewrite the initialization time data.

At time t=t3, the microcomputer 14 starts executing the time rewriting process from the beginning again.

At time t=t4, the microcomputer 14 starts rewriting each time element of the time data to initialized time data.

At time t=t5, the microcomputer 14 finishes rewriting to the initialization time data.

At time t=t6, the microcomputer 14 terminates the self-shutdown process, terminates the clock IC control process, and turns off the power.

Here, in step S23 of the timepiece IC control process described above, it is determined whether or not there is a request to rewrite the initialization time data. good too. In this case, the microcomputer 14 communicates with the clock IC 13 to execute time rewrite processing in the process of step S24, and rewrites the time data of the clock IC 13 to the test time data. Even if the ignition switch 5 is turned off and the communication with the clock IC 13 is cut off during the process of rewriting the test time data in the process of step S24, the microcomputer 14 performs the process of step S23. Since there is a request to rewrite the test time data at , execution of the rewriting process to the initialization time data is started in the self-shutdown process after the ignition switch 5 is turned off.

In the electronic control unit 1 according to the present embodiment described above, the clock IC 13 for executing the clocking process for clocking the time and the clocking process for clocking the time independently from the clock IC 13 are executed. and a microcomputer 14 for detecting an abnormality of the clock IC 13 based on comparison with the result of time measurement by the IC 13. The microcomputer 14 converts the time data of the clock IC 13 into all the time data. WAIT processing is performed to rewrite the elements to test time data that can be updated within a predetermined time period, and to cause the clock IC 13 to perform timekeeping processing. Since the abnormality detection process for detecting an abnormality in the clock 13 is executed based on the result of comparison with the time measured by the clocking process in the IC 13, an abnormality occurring in the clock IC 13 can be detected with high accuracy.

In addition, in the electronic control unit 1 of the present embodiment, the microcomputer 14 reads and stores the time data of the clock IC 13 before being rewritten to the test time data in the WAIT process, and when the clock IC 13 is normal in the abnormality detection process, , when the predetermined time has passed since the start of the WAIT process, the current time data obtained by adding the predetermined time to the time of the stored time data is written back to the clock IC 13. Therefore, the abnormality detection process is executed. In this case, the clock IC 13 can keep accurate current time continuously.

The present invention is not limited to the above-described embodiments in terms of the types, shapes, arrangements, numbers, etc. of the members, and the gist of the invention is not deviated from, such as by appropriately replacing the constituent elements with those having equivalent effects. Of course, it can be appropriately changed within the range.

Specifically, in the above embodiment, the electronic control device 1 is mounted on the vehicle and used, but the electronic control device may be mounted on a computer or the like other than the vehicle and used.

In the above-described embodiment, 100 seconds was exemplified as the predetermined time that elapses in the WAIT process, but the predetermined time is not limited to this, and can be any time that can update all the time elements of the time data. In this case, the shorter the predetermined time, the shorter the time required for the WAIT process, and the earlier the abnormality of the clock IC 13 can be detected.

In the above-described embodiment, the clock IC 13 measures the soak time and the like. However, the present invention is not limited to this. can be timed.

In the above embodiment, the time elements of the time data are year, month, day, hour, minute, and second. It may be a part of the second, or any of the year, month, day, hour, minute and second may be replaced with the day of the week, etc., or the year, month, day, hour, minute and The day of the week, etc. may be added to the seconds.

In the above embodiment, the soak time is calculated by rewriting the time data of the clock IC 13 to the initialization time data and performing the timekeeping process by the clock IC 13. However, the invention is not limited to this, and a time other than the soak time may be calculated. good.

As described above, according to the present invention, it is possible to provide an electronic control device that can accurately detect an abnormality that has occurred in the timing section. It is expected that it can be widely applied to

DESCRIPTION OF SYMBOLS 1... Electronic control unit 2... Battery 3... Sub power supply 4... Main power supply 5... Ignition switch 11... Sub power supply IC
12... Main power supply IC
13... Clock IC
14 Microcomputer

Claims (2)

A clocking unit for executing a first clocking process for clocking time, and a second clocking process for clocking time independently of the clocking part, and a clocking result of the second clocking process and the clocking result of the clocking process. a control unit that detects an abnormality of the time measuring unit based on a comparison with the result of the time measuring process of No. 1, the electronic control device comprising:
The control unit
rewriting the time data of the timekeeping unit into test time data in which all time elements of the time data can be updated within a predetermined period of time, executing a wait process for causing the timekeeping unit to execute the first timekeeping process; Based on the comparison result between the time measured by the second timekeeping process when the predetermined time has passed from the start of the process and the time measured by the first timekeeping process in the timekeeping unit, Execute anomaly detection processing to detect anomalies,
An electronic control device characterized by: The control unit
In the wait process, the time data of the timer section before being rewritten to the test time data is read and stored, and when the timer section is normal in the abnormality detection process, the predetermined time period is reached from the start of the wait process. when the time elapses, writes back the current time data of the current time obtained by adding the predetermined time to the time of the stored time data to the clock unit;
2. The electronic control device according to claim 1, wherein:

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