JP2010173494A - Control device and control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control device preferentially storing effective data specifying the cause of a failure and having high importance in a memory. <P>SOLUTION: The control device includes: an SRAM 114 for storing control data stored in a ring buffer 113a; and a microcomputer 103 executing ring buffer processing storing control data successively generated in the ring buffer 113a by ring buffer control, processing determining the abnormality of a predetermined part according to an input signal from an input/output portion 115, a processing storing the control data stored in the ring buffer 113a to the SRAM 114 when the abnormality of the predetermined part is determined, and processing preferentially memory-controlling the control data stored when an abnormality having high importance is determined rather than the control data stored when an abnormality having low importance is determined to the SRAM 114 in the case that the determination of the abnormality is executed several times. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a control device and a control method. In particular, the present invention relates to a control device and a control method used for a vehicle.

  2. Description of the Related Art Conventionally, a vehicle control device writes and holds various types of vehicle information indicating the state of a vehicle in a storage device so that the cause of a failure or the like that has occurred in the vehicle can be analyzed. In general, the control device normally writes vehicle information sequentially into a volatile memory such as a RAM (Random Access Memory), and stores the vehicle information written in the volatile memory when an abnormality such as a failure occurs. It is configured to record in a non-volatile memory such as Electronically Erasable and Programmable Read Only Memory (see, for example, Patent Document 1).

JP 2003-260993 A

However, when a vehicle information write request exceeding the storage amount of the nonvolatile memory is issued, the vehicle information stored in the nonvolatile memory until then may be erased by newly written vehicle information. For this reason, there is a case where data with high importance for specifying the cause of vehicle failure, such as legally relevant data, is deleted, and it becomes difficult to specify the cause of failure with data with high importance.
Further, the capacity of the non-volatile memory itself may be increased, but the cost is increased accordingly.

  The present invention has been made in view of the above circumstances, and is a control device and a control method capable of preferentially storing high-priority data in a storage unit, which is valid data that can identify the cause of failure. The purpose is to provide.

The above-described object is a control device that stores and controls data related to control when controlling a controlled part, and relates to a control unit that stores data related to control and a control stored in the one storage unit. Another storage unit for storing data, ring buffer control processing for storing data related to sequentially generated control in one storage unit by ring buffer control, and abnormality of a predetermined part based on an input signal from the input unit An abnormality determination process for determining, a storage control process for storing data related to the control stored in one storage unit when another part is abnormally determined by the abnormality determination process, and the abnormality determination process In the storage control process when multiple are executed, data related to the control stored when determining an abnormality with high importance is recorded when determining an abnormality with low importance. A control unit for executing a priority storage control process for controlling preferentially stored in the other storage unit than the data related to the control of achievable by a control device provided with.
According to the present invention, data related to control stored when determining an abnormality with high importance is stored in another storage unit preferentially over data related to control stored when determining an abnormality with low importance. be able to.

Further, in the control device, the importance is a law that stipulates that data related to control when determining a predetermined abnormality is stored, or a legal abnormality in a law-based instruction or rule. Is the highest, and it is good that something other than legal abnormalities is lower than legal abnormalities.
When determining the importance of control-related data according to the law and determining abnormality of data related to control with high importance, the data related to control can be preferentially stored in another storage unit.

In the above control device, the importance is most often a law-related abnormality in a law that stipulates that data relating to a control when determining a predetermined abnormality is stored, or a law-based instruction or rule. High, non-law related abnormalities, and emissions related abnormalities are the next highest, non-law related abnormalities, and non-emission related abnormalities are the next highest.
Determine whether the data is related to the control stipulated by law or data related to emissions, set the importance of the data related to control, and store the data related to control in another storage unit according to the set importance can do.

In the above control device, the priority storage control process includes data relating to control stored when determining an abnormality of high importance in another storage unit in the storage control process when a plurality of the abnormality determination processes are executed. , To prevent overwriting by data related to control stored when determining an abnormality with low importance, or to control stored when determining an abnormality with high importance when determining an abnormality with low importance The data should not be deleted.
Therefore, it is possible to prevent the data related to the control stored when determining the abnormality having the high importance from being overwritten or deleted by the data related to the control stored when determining the abnormality having the low importance.

In the control device, the priority storage control process includes data related to control stored when determining an abnormality of low importance in another storage unit in the storage control process when a plurality of the abnormality determination processes are executed. Overwrite with control-related data stored when determining an abnormality with high importance, or delete control-related data stored when determining an abnormality with low importance when determining an abnormality with high importance It is good to do.
Therefore, the data related to the control stored when the abnormality having the low importance is determined is stored in the other storage unit, so that the data related to the control stored when determining the abnormality having the high importance is stored in the other storage unit. It is possible to prevent the problem of being not stored in the memory.

In the control device, the priority storage control process is performed when the abnormality is first determined in the storage control process when a plurality of the abnormality determination processes are executed, when the degrees of importance for all the abnormality are the same. The data relating to the control to be stored may be controlled to be stored in another storage unit with higher priority than the data relating to the control stored when another abnormality is determined.
The data related to the control stored when other abnormalities are judged may indicate an abnormal value due to the influence of the first abnormality. The possibility that the cause of the abnormality can be specified can be increased by storing in the storage unit.

In the control device, the other storage unit has one storage area and another storage area, and the abnormality determination process determines an abnormality of a predetermined part based on an input signal from the input unit. Is determined to be a temporary abnormality, and when a predetermined time has elapsed since the provisional abnormality has been determined, the abnormality is determined to be a normal abnormality, or the provisional abnormality is not determined based on an input signal from the input unit. When the abnormality of the predetermined part can be determined, it is determined as the main abnormality. The storage control process determines the temporary abnormality when the predetermined time has elapsed after the determination of the temporary abnormality by the abnormality determination process. Data related to control stored in one storage unit at the time of abnormality determination is stored in one storage area in another storage unit, and stored in one storage area in another storage unit at the time of this abnormality determination Other data regarding control When storing this abnormality in the storage area, or when determining this abnormality without making a provisional abnormality determination, control-related data stored in one storage unit at the time of this abnormality determination is stored in another storage unit. In the storage control process when a plurality of the abnormality determination processes are executed, the priority storage control process stores data related to the control stored when determining a temporary abnormality with a high degree of importance. In storage control processing in which storage control is performed prior to data relating to control stored when determining a temporary abnormality with low importance to other storage units or when a plurality of abnormality determination processes are executed, the importance is Data related to control stored when determining a high abnormality is preferentially stored in another storage unit over data related to control stored when determining a low importance abnormality. Good.
Therefore, according to the determination of the temporary abnormality determination and the main abnormality determination, or the determination result of the main abnormality determination, the data related to the control stored when determining the abnormality having high importance is stored in one storage area of the other storage unit and another It can be stored effectively in the storage area.

In the control apparatus, the priority storage control process is stored when determining a temporary abnormality having a high degree of importance in one area of another storage unit in a storage control process when a plurality of the abnormality determination processes are executed. Data related to control is not overwritten by data related to control stored when determining a temporary abnormality with low importance, or a temporary abnormality with high importance is determined when determining a temporary abnormality with low importance. It is desirable not to delete the data related to the control stored at the time.
Therefore, it is possible to prevent the data related to the control stored when determining the temporary abnormality having the high importance from being overwritten or deleted by the data related to the control stored when determining the temporary abnormality having the low importance.

In the control device, the priority storage control process is stored when determining a temporary abnormality with low importance in one area of another storage unit in the storage control process when a plurality of the abnormality determination processes are executed. When data related to the control to be overwritten is overwritten with data related to the control stored when determining a temporary abnormality with high importance, or when determining a temporary abnormality with low importance when determining a temporary abnormality with high importance It is preferable to delete the data relating to the control stored in.
Therefore, since the data related to the control stored when determining the temporary abnormality with low importance is stored in another storage unit, the data related to the control stored when determining the temporary abnormality with high importance is stored in the other storage unit. It is possible to prevent the occurrence of the problem of being not stored in the storage unit.

In the control device, the priority storage control process is stored when determining the abnormality having high importance in another area of the other storage unit in the storage control process when a plurality of the abnormality determination processes are executed. Data related to the control to be performed is not overwritten by the data related to the control stored when determining this abnormality with low importance, or when determining this abnormality with low importance, this abnormality with high importance is determined. It is preferable that data related to the control stored at the time of determination is not deleted.
Therefore, it is possible to prevent the data relating to the control stored when determining this abnormality having a high importance level from being overwritten or deleted by the data relating to the control stored when determining this abnormality having a low importance level.

In the control device, the priority storage control process is stored when determining the abnormality having a low importance in another area of another storage unit in the storage control process when a plurality of the abnormality determination processes are executed. Overwrite the data related to the control with the data related to the control that is stored when determining this abnormality with high importance, or when determining this abnormality with low importance when determining this abnormality with high importance It is preferable to delete the data relating to the control stored in.
Therefore, since the data related to the control stored when determining the main abnormality with low importance is stored in another storage unit, the data regarding the control stored when determining the main abnormality with high importance is stored in the other storage unit. It is possible to prevent the occurrence of the problem of being not stored in the storage unit.

The control method of the present invention is a control method for storing and controlling data related to control when controlling a controlled part, and a ring buffer control step for storing data related to sequentially generated control in one storage part by ring buffer control And an abnormality determination step for determining an abnormality of the predetermined part based on an input signal from the input unit, and data relating to control stored in one storage unit when the abnormality is determined for the predetermined part by the abnormality determination step. In the storage control step for storing in another storage unit and the storage control step when a plurality of the abnormality determination steps are executed, the data related to the control stored when determining the abnormality with high importance is low in importance. Priority storage control step for performing storage control to other storage units with higher priority than data related to control stored when determining abnormality That.
According to the present invention, data related to control stored when determining an abnormality with high importance is stored in another storage unit preferentially over data related to control stored when determining an abnormality with low importance. be able to.

  According to the present invention, it is possible to provide a control device and a control method capable of preferentially storing high-priority data, which is valid data capable of specifying the cause of failure, in the storage unit.

It is a block diagram which shows the structure of engine ECU. It is a figure which shows the network structure to which engine ECU was connected. It is a block diagram which shows the structure of a microcomputer. It is a figure for demonstrating temporary abnormality determination and this abnormality determination. It is a figure which shows the storage area of SRAM. It is a figure which shows the recording procedure to the state data of the vehicle to SRAM when the state data of the vehicle with low priority is set from temporary abnormality to this abnormality. It is a figure which shows the recording procedure to the status data of the vehicle to SRAM when the status data with high priority is set to this abnormal state after the status data with low priority is set to this abnormal status. It is a figure which shows the recording procedure to the state data of the vehicle to SRAM when the state data with a high priority is set to this abnormal state after the state data with a low priority is set to the temporary abnormality state. It is a figure which shows the recording procedure to the state data of the vehicle to SRAM when the state data with high priority is set to the state of provisional abnormality after the state data with low priority is set to this abnormal state. . It is a figure which shows the recording procedure to the state data of the vehicle to SRAM when the state data with high priority is set to the state of temporary abnormality after the state data with low priority is set to the state of temporary abnormality. . It is a figure which shows the recording procedure to the state data of the vehicle to SRAM when the state data with high priority is set to the state of temporary abnormality after the state data with low priority is set to the state of temporary abnormality. . It is a figure which shows the process sequence when abnormality is detected in a different abnormality detection part. It is a figure which shows the recording procedure to the status data of the vehicle to SRAM when the status data of another site | part b is set to this abnormality after the status data of site | part a is set to temporary abnormality. It is a figure which shows the recording procedure to the status data of the vehicle to SRAM when the status data of site | part a is set to this abnormality before all the status data of site | part a are recorded on SRAM.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

  1 shows a configuration of an embodiment in which the present invention is applied to an engine ECU ((Electronic Control Unit). An engine ECU (Electronic Control Unit) 100 includes an A / D (Analog / Digital) converter 101, an input circuit. 102, a microcomputer 103, and an output circuit 104.

The A / D converter 101 includes a water temperature sensor 11, a vacuum sensor 12, an intake air temperature sensor 13, an O2 sensor 14, a throttle position sensor 15, an exhaust temperature sensor 16, a vehicle speed sensor 17, a knock sensor 18, an ion sensor 19, and other sensors. Sensor signals from sensors such as 20 are input.
A switch signal from the starter switch 21 or the idle switch 22 is input to the input circuit 102.

The water temperature sensor 11 detects the temperature of the cooling water in the water jacket of the engine, and transmits a sensor signal representing the detection result to the microcomputer 103.
The vacuum sensor 12 detects the amount of intake air in the intake passage that guides intake air to the engine, and transmits a sensor signal representing the detection result to the microcomputer 103.
The intake air temperature sensor 13 detects the temperature of the intake air in the intake passage and transmits a sensor signal representing the detection result to the microcomputer 103.
The O2 sensor 14 is disposed on the downstream side of the exhaust purification catalyst, detects the oxygen concentration in the exhaust gas, and transmits a sensor signal representing the detection result to the microcomputer 103.
The throttle position sensor 15 detects the opening degree of the throttle valve that rotates by driving the motor, and transmits a signal representing the detection result to the microcomputer 103.
The exhaust temperature sensor 16 detects the exhaust temperature on the downstream side of the exhaust purification catalyst, and transmits a sensor signal representing the detection result to the microcomputer 103.
For example, the vehicle speed sensor 17 detects the speed of the vehicle from the rotational speed of the drive shaft, and transmits a sensor signal representing the detection result to the microcomputer 103.
The knock sensor 18 detects engine vibration (knocking) and transmits a sensor signal representing the detection result to the microcomputer 103.
The ion sensor 19 detects an ionic current generated when preignition occurs, and transmits a sensor signal representing the detection result to the microcomputer 103.
In addition to these sensors, a plurality of sensors (hereinafter referred to as other sensors 20) for measuring the state of the vehicle are mounted.

  The starter switch 21 is a switch for starting the engine, and outputs a signal (switch signal) that becomes a high level when the switch state is on to the microcomputer 103. The idle switch 22 outputs a signal (switch signal) that becomes a high level when the accelerator pedal is fully closed to the microcomputer 103.

  The engine ECU 100 calculates an optimal ignition timing, fuel injection timing, injection amount, and the like of the engine based on information acquired from various sensor signals and various switch signals. Based on the calculation result, the injector 152 and the spark plug 154 provided for each cylinder are driven via the output circuit 104.

An alarm lamp 151, an injector 152, an igniter 153, and the like are connected to the output circuit 104 of the engine ECU 100.
The alarm lamp 151 is a lamp that is turned on when occurrence of an abnormality is detected by abnormality monitoring of the engine ECU 100. Details of the abnormality monitoring will be described later.
The injector 152 is configured by an electromagnetic valve that is driven to open and close under the control of the engine ECU 100 and injects fuel.
The igniter 153 supplies battery voltage to an ignition coil (not shown) under the control of the engine ECU 100, generates a spark with the ignition plug 154 by the high voltage stored in the ignition coil, and burns the air-fuel mixture in the combustion chamber.

FIG. 2 shows a system configuration of engine ECU 100.
A plurality of ECUs are mounted on the vehicle, and these ECUs are connected by an in-vehicle LAN. In addition, communication between these ECUs is performed according to a protocol such as CAN (Controller Area Network). 2 shows an engine ECU 100, a CVT (Continuously Variable Transmission) -ECU 201, a brake ECU 202, a navigation ECU 203, a telematics ECU 204, a light ECU 205, an airbag ECU 206, and a door ECU 207 as ECUs for controlling the vehicle. ECU which communicates with engine ECU100 is not restricted to these.

FIG. 3 shows a hardware configuration of the microcomputer 103.
The microcomputer 103 includes a CPU (Central Processing Unit) 111, a ROM 112, a normal RAM (Normal Random Access Memory (hereinafter abbreviated as NRAM) 113, a standby RAM (Standby Random Access Memory (hereinafter abbreviated as SRAM 114)) 114, an input / output Part 115.
The NRAM 113 is a volatile memory, and when the ignition switch is turned off, the power supply to the NRAM 113 is stopped and information recorded in the NRAM 113 is also erased. In addition, the SRAM 114 retains information to be recorded by receiving power from the battery even when the ignition switch is turned off.

The CPU 111 performs a ring buffer control process, an abnormality determination process, a storage control process, and a priority storage control process by performing an operation according to a program recorded in the ROM 112.
The ring buffer control process uses the NRAM 113 as a ring buffer (hereinafter, the NRAM 113 is referred to as a ring buffer 113a), and vehicle state data measured by the sensors 11 to 20 shown in FIG. Are sequentially stored in the ring buffer 113a. When the storage amount of the ring buffer 113a exceeds the capacity of the ring buffer 113a, the CPU 111 overwrites new state data instead of the oldest state data. The details of the vehicle state data will be described later.
In general, the ring buffer 113a is for temporarily storing data, and data or a block of data (hereinafter referred to as a block) is a first-in first-out (FIFO) method or last-in first-out ( This is a memory device managed in the form of a LIFO (Last In First Out) system or the like.
The abnormality determination process is a process for determining an abnormality of a predetermined part of the vehicle based on a sensor signal input from the input / output unit 115.
The storage control process is a process for recording state data related to a predetermined part determined to be abnormal by the abnormality determination process from the ring buffer 113a to the SRAM 114.
The priority storage control process is a storage control process performed when a plurality of abnormality determination processes are executed. When determining an abnormality with a low degree of importance, vehicle state data stored when determining an abnormality with a high degree of importance is used. This is a process of recording in the SRAM 114 with priority over the stored vehicle state data.
Details of the storage control process and the priority storage control process will be described in detail with reference to FIGS.

Next, the abnormality determination process will be described with reference to FIG. The CPU 111 determines a vehicle abnormality based on the vehicle state data stored in the ring buffer 113a. The abnormality determination process will be described with reference to FIG.
For example, when the sensor value stored as the vehicle state data in the ring buffer 113a indicates an abnormal value, or when the sensor value does not change with a constant value, a flag indicating that the abnormal value has been detected is set. (1 is recorded in the abnormal value detection flag shown in FIG. 4A). Moreover, 1 is recorded in the flag which shows the determination result of temporary abnormality determination by detection of an abnormal value (refer FIG.4 (b)). The provisional abnormality determination is a determination as to whether or not the sensor value indicates an abnormal value, and indicates the start of the subsequent abnormality determination. In this abnormality determination, the abnormality counter shown in FIG. 4E starts counting up, and it is determined whether or not the abnormality of the sensor value continues for a predetermined time or more. In the temporary abnormality determination, the sensor value that once indicated an abnormal value is determined to be abnormal. Therefore, in this abnormality determination, a sensor value that indicates an abnormal value continues to be determined to be abnormal regardless of noise or the like. When the count value of the abnormality counter exceeds the abnormality detection threshold value shown in FIG. 4D, 1 is recorded in the flag indicating the determination result of the abnormality determination (see FIG. 4C), and the sensor value abnormality is detected. Determine.
When the sensor value returns from the abnormal value to the normal value, 0 is recorded in the abnormal value detection flag shown in FIG. 4A, and the normal counter shown in FIG. 4F starts counting. When the count value of the normal counter exceeds the normal detection threshold value, it is determined that the sensor value is normal.

  In the example shown in FIG. 4, the temporary abnormality determination and the main abnormality determination are performed to determine the sensor value abnormality. However, the vehicle state data in which the abnormality is determined without performing the temporary abnormality determination and the main abnormality determination. There is also. For example, there is also vehicle state data that is not affected by noise or the like and that determines an abnormality (determines this abnormality) at a stage where an abnormal value is shown without performing the abnormality determination.

In the above-described example, the abnormality of the sensor value has been described as an example, but the engine ECU 100 detects an abnormality other than the sensor value.
For example, it is determined as a temporary abnormality when it is determined that the sensor is disconnected or short-circuited, and this abnormality is determined when this state continues for a predetermined time or more.
Further, when it is determined that the signal level is in an indefinite state, it is determined as a temporary abnormality, and when this indefinite state continues for a predetermined time or more, it is determined as a main abnormality.
Further, when it is determined that communication is interrupted, it is determined as a temporary abnormality, and when this communication interruption state continues for a predetermined time or more, it is determined as this abnormality.
Further, when it is determined that the advance angle or delay angle abnormality has occurred in the rotation angle sensor, it is determined as a temporary abnormality, and when this abnormal state continues for a predetermined time or more, it is determined as a main abnormality.
In addition, when it is determined that a malfunction has occurred in a variable valve timing mechanism (hereinafter referred to as VVT (Variable Valve Timing-control)), etc., it is determined as a temporary malfunction. This is determined to be abnormal.
Further, when it is determined that an operation failure has occurred in the operation of the IC, it is determined as a temporary abnormality, and when this operation failure continues for a predetermined time or more, it is determined as a main abnormality.
Further, it is determined as a temporary abnormality when the performance deterioration of the catalyst or the like is detected, and when this performance deterioration continues for a predetermined time or more, it is determined as the main abnormality.
Further, for example, a temporary abnormality is determined when an abnormality due to an overcurrent occurring in an ECU, an input sensor, an output actuator, or the like is detected, and a case where this abnormality continues for a predetermined time or more is determined as a main abnormality.

FIG. 5 shows recorded information in the SRAM 114. When the CPU 111 detects state data indicating an abnormal value from the vehicle state data stored in the ring buffer 113a, the detected state data and the vehicle state data stored in the ring buffer 113a at the same timing as the detected state data are detected. The vehicle state data stored in the ring buffer 113a immediately before the occurrence of the trouble and the vehicle state data stored in the ring buffer 113a after a predetermined time has elapsed since the occurrence of the abnormality are recorded in the SRAM 114. As shown in FIG. 5, the SRAM 114 stores an area for recording information for specifying an abnormality occurrence location specified by the CPU 111 (hereinafter, referred to as an abnormality detection location storage area 120), and status data determined as a temporary abnormality. It has an area for storing (hereinafter referred to as temporary abnormality data storage area 130) and an area for storing state data determined to be the main abnormality (hereinafter referred to as main abnormality data storage area 140).
The temporary abnormality data storage area 130 stores an area for storing state data immediately before an abnormality occurs (hereinafter referred to as a state data storage area 131 before the occurrence of an abnormality) and state data when an abnormality occurs. An area (hereinafter referred to as a state data storage area 132 when an abnormality occurs) and an area for storing state data after a predetermined time has elapsed since the occurrence of the abnormality (hereinafter referred to as a state data storage area 133 after the occurrence of an abnormality). is doing.
Similarly, the abnormal data storage area 140 also stores an area for storing state data immediately before the occurrence of the abnormality (hereinafter referred to as a state data storage area 141 before the occurrence of the abnormality) and a state data when the abnormality has occurred. An area (hereinafter referred to as a state data storage area 142 when an abnormality occurs) and an area for storing state data after a predetermined time has elapsed since the occurrence of the abnormality (hereinafter referred to as a state data storage area 143 after the occurrence of an abnormality). Have.

Next, a description will be given of a vehicle part (controlled part) for which the engine ECU 100 monitors the occurrence of an abnormality. The parts that the engine ECU 100 monitors for the occurrence of an abnormality include the parts related to the regulations stipulated by the law, the parts related to the emission (the harmful substances contained in the exhaust gas), and the other parts. And non-emission related parts. The regulations include a law that stipulates that state data is stored when an abnormality of a vehicle part is determined, an instruction based on the law, or a law in a rule.
For example, as shown in Table 1, A / F (air / fuel ratio) sensor heater, O2 sensor heater, air flow meter, sub O2 sensor voltage, fuel system, misfire detection, crank angle sensor, cam position sensor, etc. Anomaly detection is included.
In addition, as shown in Table 1, VVT, exhaust VVT, VVT oil control valve disconnection, short circuit, exhaust VVT oil control valve disconnection, short circuit, abnormal pressure difference between atmospheric pressure and intake air , Pump valve abnormality, fuel pressure system abnormality, regulator abnormality, fuel leakage abnormality, intake pressure sensor abnormality, water temperature sensor, throttle sensor, thermostat abnormality, injector abnormality, fuel pump abnormality, knock sensor abnormality, ionic current value abnormality, exhaust gas reactivation Circulation (hereinafter referred to as EGR (Exhaust Gas Recirculation)) system abnormality, catalyst deterioration detection, tank internal pressure sensor abnormality, vehicle speed sensor abnormality, battery temperature sensor abnormality, exhaust temperature sensor abnormality, oil temperature sensor abnormality, turbine speed sensor abnormality , CO clutch speed sensor error, NC2 speed sensor Items such as abnormality, solenoid abnormality, and CAN communication abnormality are included.
Further, as shown in Table 1, abnormalities in the ECU and the NRAM are included in the non-emission portion.

Further, the vehicle state data (data related to control when controlling the controlled portion) to be recorded in the SRAM 114 in order for the engine ECU 100 to identify the cause of the abnormality in the above-described part includes the following. Note that it is not necessary to record all items listed below, and it is possible to select them.
First, as shown in Table 2, the vehicle state data used to identify the cause of abnormality of the above-mentioned legally relevant items includes engine water temperature, intake pipe pressure, engine speed, vehicle speed, ignition timing (for example, Advance timing), intake air temperature, air flow rate, throttle opening, front O2 sensor output, rear O2 sensor output, engine start time, total fuel correction amount, A / F sensor output voltage, EGR output, EGR error, evaporation purge Output, atmospheric pressure, catalyst temperature, power supply voltage, absolute load value, target air-fuel ratio, relative throttle opening, atmosphere temperature, throttle absolute position sensor, accelerator pedal absolute position sensor, throttle actuator output, variable valve timing / lift mechanism , VVTL (Variable Valve Timing and Lift) target position, hydraulic switch, VVTL OC Drive duty, VVT holding duty learned value, VVT displacement angle, OCV drive request duty, the duty learned value EXvvt, EXvvt displacement angle, EXOCV driving target duty cycle, and the like TVVT angle conversion value.
In addition, as shown in Table 2, the vehicle state data used for detecting abnormalities in the emission-related and non-emission-related parts described above includes engine water temperature, intake pipe pressure, engine speed, vehicle speed, ignition timing. Advance angle, intake air temperature, air flow rate, throttle opening, front O2 sensor output, rear O2 sensor output, engine start time, total fuel correction amount, A / F sensor output voltage, EGR output, EGR error, evaporation purge output, Atmospheric pressure, catalyst temperature, power supply voltage, target air-fuel ratio, throttle absolute position sensor, accelerator pedal absolute position sensor, throttle actuator output, charge control battery current, charge control battery fluid temperature, alter field duty, target supercharging pressure, supercharging Pressure VSV (Vacuum Switching Valve) control duty ratio, idling signal, A / C signal Signal, electrical signal, STP signal, power steering signal, intake side target displacement angle, intake side actual displacement angle, intake side control duty ratio, exhaust side target displacement angle, exhaust side actual displacement angle, exhaust side control duty ratio, gas pressure sensor Value, EGR step number, hydraulic switch, VVTL OCV drive duty, VVT hold duty learning value, VVT displacement angle, OCV drive request duty, EXVVT duty learning value, EXVVT displacement angle, EXOCV drive request duty value, TVVT angle Examples include a converted value, an idle speed control control (hereinafter abbreviated as ISC) step position, an ISC duty value, a fuel injection amount, a water temperature at engine start, an intake air temperature at engine start, and a fuel injection time.

The vehicle state data recorded in the SRAM 114 is used for vehicle failure diagnosis and the like. A worker who performs repairs, maintenance, and the like reads out the vehicle state data recorded in the SRAM 114 using a tool or the like, identifies a failure location based on the read information, and replaces a sensor or a part.
At this time, the state data of the vehicle recorded in the SRAM 114 is more effective for identifying the failure location and the cause of the failure as the state data that can identify the failure of the highly important portion is recorded. Therefore, in the present embodiment, the vehicle state data for detecting the abnormality of the most important regulation-related part described above is recorded in the SRAM 114 as high priority data. Next, the priority of the vehicle state data for detecting an abnormality in the emission-related part having the highest importance is set lower than that in the law-related part. Further, the priority of the vehicle state data for detecting an abnormality in the emission non-related part is set lower than that in the emission related part.
In addition, when recording the vehicle state data in the SRAM 114, control is performed so that the vehicle state data for determining the abnormality with high priority is not overwritten with the vehicle state data for determining the abnormality with low priority. . This control procedure will be described with reference to FIGS.

FIG. 6 shows the state data stored in the ring buffer 113a and the recording timing of the state data in the SRAM 114.
The microcomputer 103 stores vehicle state data such as sensor signals measured by the various sensors 11 to 20 and state signals indicating the states of the switches 21 and 22 in the ring buffer 113a every 512 msec. That is, the vehicle state data is stored in the ring buffer 113a at the timing of step 1, step 2, step 3,... Shown in FIG.
In the example illustrated in FIG. 6, at the timing of step 2, priority 2 (hereinafter, state data for determining a low priority abnormality is denoted as priority 2, and state data for determining a high priority abnormality is priority. 1) is stored in the ring buffer 113a, and this state data is set to be temporarily abnormal at the timing A shown in FIG. Furthermore, it is assumed that the state data of priority 2 is set from the temporary abnormal state to the present abnormal state at the timing B shown in FIG.
At timing A, it is assumed that the state data of priority 2 stores the state data before the occurrence of the abnormality and the state data when the abnormality occurs in the ring buffer 113a.
The microcomputer 103 records the priority level 2 status data in the temporary error data storage area 130 of the SRAM 114 when the priority level 2 status data is set to a temporary error. At the stage where the status data of priority 2 is set to a temporary abnormality, the state data before the occurrence of the abnormality and the state data at the time of the occurrence of the abnormality are stored in the ring buffer 113a. It is recorded in the temporary abnormality data storage area 130 of the SRAM 114. In FIG. 6 to FIG. 14, the state data before the abnormality of the state data with priority 2 is expressed as “before 2”. In addition, the state data when abnormality of the state data of priority 2 occurs is expressed as “excellent 2 difference”. Similarly, the state data before the occurrence of the abnormality of the priority level 1 state data is represented as “excluded by the superior 1”. In addition, the state data when abnormality in the state data of priority 1 occurs is denoted as “excellent 1”.

  In the next step 3 (512 msec has elapsed since step 2), among the state data of priority 2, the state data after a predetermined time has elapsed since the occurrence of the abnormality is stored in the ring buffer 113a. The microcomputer 103 records the status data stored in the ring buffer 113 a after the elapse of a predetermined time in the temporary abnormality data storage area 130 of the SRAM 114. In the following, the state data after a predetermined time has elapsed since the occurrence of abnormality in the state data of priority 2 is referred to as “after 2”. Similarly, state data after a predetermined time has elapsed since the occurrence of abnormality in the state data of priority 1 is expressed as “after superior 1”.

Next, the status data of the priority level 2 set to be temporarily abnormal at the timing B between step 4 (elapsed (512 × 2) msec from step 2) and step 5 (elapsed (512 × 3) msec from step 2) Suppose that the abnormality is confirmed and set to the data of this abnormality.
At this time, the microcomputer 103 records the status data of the priority 2 recorded in the temporary abnormality data storage area 130 of the SRAM 114 in the main abnormality data storage area 140 of the SRAM 114. At this time, the status data of priority 2 recorded in the temporary abnormality data storage area 130 is deleted. Even if the same status data is recorded, the storage area of the SRAM 114 is wasted, so the information in the temporary abnormality data storage area 130 is deleted. Although not shown in FIG. 6, when status data is recorded in the abnormal data storage area 140 of the SRAM 114, the status data of priority 2 is overwritten in the abnormal data storage area 140 of the SRAM 114.

  As described above, according to the present embodiment, even temporary abnormality state data with a low degree of abnormality can be recorded in the temporary abnormality data storage area 130. Further, abnormality of the state data has a high degree of abnormality caused by a failure or the like. When it is determined that the data is state data, the temporary abnormal data storage area 130 can be recorded in the abnormal data storage area 140.

The example shown in FIG. 7 shows a case in which the state data for determining an abnormality with a high priority is set to the state of this abnormality after the state data for determining an abnormality with a low priority is set to this abnormality state. Yes.
Assume that the status data of the priority level 2 stored in the ring buffer 113a at the timing shown in step 1 of FIG. 7 is set to the abnormal state at the timing C shown in FIG.
The microcomputer 103 records the state data before the occurrence of the abnormality among the state data of priority 2 and the state data when the abnormality occurs in the abnormal data storage area 140 of the SRAM 114 from the ring buffer 113a.

  At the timing of the next step 2 (512 msec has elapsed since step 1), among the state data of priority 2, the state data after a predetermined time has elapsed since the occurrence of the abnormality is stored in the ring buffer 113a. The microcomputer 103 records the priority level 2 state data stored in the ring buffer 113 a after the elapse of a predetermined time in the abnormal data storage area 140 of the SRAM 114.

Next, it is assumed that the state data of priority 1 stored in the ring buffer 113a at the timing of step 4 (512 × 3 msec has elapsed from step 1) is set to the abnormality at the timing D shown in FIG.
The microcomputer 103 records, from the ring buffer 113a, the abnormal data storage area 140 of the SRAM 114, from the ring buffer 113a, the state data before the occurrence of the abnormality among the state data of the priority level 1 and the state data when the abnormality occurs. At this time, the status data of the priority 2 recorded in the abnormal data storage area 140 of the SRAM 114 is deleted. Thereafter, the status data of priority 1 is recorded in the abnormal data storage area 140 of the SRAM 114 from which the status data of priority 2 has been deleted. Alternatively, the priority level 1 status data is overwritten on the priority level 2 status data. Accordingly, high priority status data can be recorded or overwritten in the abnormal data storage area 140 of the SRAM 114 for storage.

  At the next step 5 (512 msec has elapsed since step 4), among the priority level 1 state data, the state data after a predetermined time has elapsed since the occurrence of the abnormality is stored in the ring buffer 113a. The microcomputer 103 stores the state data stored in the ring buffer 113 a after the elapse of a predetermined time in the abnormal data storage area 140 of the SRAM 114.

  As described above, according to the present exemplary embodiment, it is possible to preferentially record the highly important data in the SRAM 114, which is valid data that can identify the cause of the failure.

The example shown in FIG. 8 shows a case where the state data for determining an abnormality with a high priority is set to the state of this abnormality after the state data for determining an abnormality with a low priority is set to the temporary abnormality state. Yes.
It is assumed that the status data of priority 2 stored in the ring buffer 113a at the timing shown in step 1 of FIG. 8 is set to this abnormality at the timing E shown in FIG.
The microcomputer 103 records the state data before the occurrence of the abnormality and the state data at the time of occurrence of the abnormality among the state data of the priority 2 from the ring buffer 113a to the temporary abnormality data storage area 130 of the SRAM 114.

  At the timing of the next step 2 (512 msec has elapsed since step 1), among the state data of priority 2, the state data after a predetermined time has elapsed since the occurrence of the abnormality is stored in the ring buffer 113a. The microcomputer 103 records the priority level 2 state data stored in the ring buffer 113 a after the lapse of a predetermined time in the temporary abnormality data storage area 130 of the SRAM 114.

Next, it is assumed that the status data of priority level 1 stored in the ring buffer 113a at the timing of step 4 (512 × 3 msec has elapsed from step 1) is set to this abnormality at timing F shown in FIG.
The microcomputer 103 erases the status data of priority 2 recorded in the temporary abnormality data storage area 130 of the SRAM 114 from the temporary abnormality data storage area 130. Further, the status data of priority 1 is recorded in the abnormal data storage area 140 of the SRAM 114. Although not shown in FIG. 8, when status data is recorded in the abnormal data storage area 140 of the SRAM 114, the status data of priority 1 is overwritten in the abnormal data storage area 140 of the SRAM 114. The microcomputer 103 records, from the ring buffer 113a, the abnormal data storage area 140 of the SRAM 114, from the ring buffer 113a, the state data before the occurrence of the abnormality among the state data of the priority level 1 and the state data when the abnormality occurs. Accordingly, high priority status data can be recorded or overwritten in the abnormal data storage area 140 of the SRAM 114 for storage.

  At the next step 5 (512 msec has elapsed since step 4), among the priority level 1 state data, the state data after a predetermined time has elapsed since the occurrence of the abnormality is stored in the ring buffer 113a. The microcomputer 103 records the status data of priority 1 stored in the ring buffer 113 a after the elapse of a predetermined time in the abnormal data storage area 140 of the SRAM 114.

  In this way, this embodiment can record only high priority status data in the SRAM 114.

The example shown in FIG. 9 shows a case where the state data for determining an abnormality with a high priority is set to a temporary abnormality state after the state data for determining an abnormality with a low priority is set to the state of this abnormality. ing.
Assume that the status data of the priority level 2 stored in the ring buffer 113a at the timing shown in step 1 of FIG. 9 is set to the abnormal state at the timing G shown in FIG.
The microcomputer 103 records the state data before the occurrence of the abnormality among the state data of priority 2 and the state data when the abnormality occurs in the abnormal data storage area 140 of the SRAM 114 from the ring buffer 113a.

  At the timing of the next step 2 (512 msec has elapsed since step 1), among the state data of priority 2, the state data after a predetermined time has elapsed since the occurrence of the abnormality is stored in the ring buffer 113a. The microcomputer 103 records the status data of priority 2 recorded in the ring buffer 113 a after the elapse of a predetermined time in the abnormal data storage area 140 of the SRAM 114.

Next, it is assumed that the status data of priority 1 stored in the ring buffer 113a at the timing of step 4 (elapsed 512 × 3 msec from step 1) is set to a temporary abnormality at the timing H shown in FIG.
The microcomputer 103 records status data of priority 1 in the temporary abnormality data storage area 130 of the SRAM 114. The microcomputer 103 records the state data before the occurrence of the abnormality and the state data when the abnormality occurs in the priority level 1 state data from the ring buffer 113 a to the abnormal data storage area 140 of the SRAM 114. At this time, the status data of priority 2 is recorded in the abnormal data storage area 140 of the SRAM 114 as it is.
Although not shown in FIG. 9, when status data is recorded in the temporary abnormality data storage area 130 of the SRAM 114, the status data of priority 1 is overwritten in the temporary abnormality data storage area 130 of the SRAM 114.

At the next step 5 (512 msec has elapsed since step 4), among the priority level 1 state data, the state data after a predetermined time has elapsed since the occurrence of the abnormality is stored in the ring buffer 113a. The microcomputer 103 records the status data of priority 1 stored in the ring buffer 113 a after the elapse of a predetermined time in the temporary abnormality data storage area 130 of the SRAM 114.
After that, when the priority level 1 state data is set from the temporary abnormality state to the main abnormality state, the microcomputer 103 erases the priority level 2 state data from the main abnormality data storage area 140 of the SRAM 114 and gives priority. The state data of degree 1 is overwritten and recorded in the abnormal data storage area 140 of the SRAM 114.

  As described above, in this embodiment, the state data for determining the low priority abnormality is not deleted from the abnormality data storage area 140 until the abnormality degree of the state data for determining the high priority abnormality is determined. can do.

The example shown in FIG. 10 shows a case where the state data for determining the high priority abnormality is set to the temporary abnormality state after the state data for determining the low priority abnormality is set to the temporary abnormality state. ing.
Assume that the status data of priority 2 stored in the ring buffer 113a at the timing shown in step 1 of FIG. 10 is set to a temporary abnormality at the timing I shown in FIG.
The microcomputer 103 records the state data before the occurrence of the abnormality and the state data at the time of occurrence of the abnormality among the state data of the priority 2 from the ring buffer 113a to the temporary abnormality data storage area 130 of the SRAM 114.

  At the timing of the next step 2 (512 msec has elapsed since step 1), among the state data of priority 2, the state data after a predetermined time has elapsed since the occurrence of the abnormality is stored in the ring buffer 113a. The microcomputer 103 records the priority level 2 state data stored in the ring buffer 113 a after the lapse of a predetermined time in the temporary abnormality data storage area 130 of the SRAM 114.

Next, it is assumed that the status data of priority 1 stored in the ring buffer 113a at the timing of step 4 (elapsed 512 × 3 msec from step 1) is set as a temporary abnormality at timing J shown in FIG.
The microcomputer 103 records the state data before the occurrence of the abnormality and the state data when the abnormality occurs in the state data of the priority 1 from the ring buffer 113a to the temporary abnormality data storage area 130 of the SRAM 114. At this time, the status data of the priority level 2 recorded in the temporary abnormality data storage area 130 of the SRAM 114 is deleted. Thereafter, the status data of priority 1 is recorded in the temporary abnormality data storage area 130 of the SRAM 114 from which the status data of priority 2 has been deleted. Alternatively, the priority level 1 status data is overwritten on the priority level 2 status data. Accordingly, high priority state data can be recorded or overwritten in the temporary abnormality data storage area 130 of the SRAM 114 and saved.

  At the next step 5 (512 msec has elapsed since step 4), among the priority level 1 state data, the state data after a predetermined time has elapsed since the occurrence of the abnormality is stored in the ring buffer 113a. The microcomputer 103 records the status data of priority 1 recorded in the ring buffer 113 a after the elapse of a predetermined time in the temporary abnormality data storage area 130 of the SRAM 114.

  In this way, this embodiment can record only high priority status data in the SRAM 114.

In the example shown in FIG. 11, after the state data for determining a low priority abnormality is set to a temporary abnormality state, the state data for determining a high priority abnormality is set to a temporary abnormality state. After the status data that determines the low priority abnormality that was in the state was set to this abnormal state, the state data that determined the high priority abnormality that was in the temporary abnormal state was set to this abnormal state Shows the case.
Assume that the status data of priority 2 stored in the ring buffer 113a at the timing shown in step 1 of FIG. 11 is set to a temporary abnormality at the timing K shown in FIG.
The microcomputer 103 records the state data before the occurrence of the abnormality and the state data at the time of occurrence of the abnormality among the state data of the priority 2 from the ring buffer 113a to the temporary abnormality data storage area 130 of the SRAM 114.

Further, it is assumed that the status data of priority 1 stored in the ring buffer 113a at the timing indicated by step 2 (elapsed 512 msec from step 1) in FIG. 11 is set to a temporary abnormality at timing L shown in FIG.
The microcomputer 103 records the state data before the occurrence of the abnormality and the state data when the abnormality occurs in the state data of the priority 1 from the ring buffer 113a to the temporary abnormality data storage area 130 of the SRAM 114. At this time, the status data of the priority level 2 recorded in the temporary abnormality data storage area 130 of the SRAM 114 is deleted. Alternatively, the priority level 1 status data is overwritten on the priority level 2 status data recorded in the temporary abnormality data storage area 130.

  At the timing of the next step 3 (elapsed (512 × 3) msec from step 1), among the priority level 1 state data, the state data after a predetermined time has elapsed from the occurrence of the abnormality is stored in the ring buffer 113a. The microcomputer 103 records the status data of priority 1 recorded in the ring buffer 113 a after the elapse of a predetermined time in the temporary abnormality data storage area 130 of the SRAM 114.

Next, it is assumed that the state data with the priority 2 is set to the abnormality at the timing M shown in FIG.
The microcomputer 103 records the status data of priority 2 in the abnormal data storage area 140 of the SRAM 114. Since the status data of priority 2 is not stored in the ring buffer 113a, the data acquired from various sensors is recorded again in the abnormal data storage area 140 of the SRAM 114. Although not shown in FIG. 11, when status data is recorded in the abnormal data storage area 140 of the SRAM 114, the status data of priority 2 is overwritten in the abnormal data storage area 140 of the SRAM 114.

Next, it is assumed that the status data with the priority level 1 is set to the abnormality at the timing N shown in FIG.
The microcomputer 103 deletes the priority level 2 status data recorded in the abnormal data storage area 140 of the SRAM 114. Then, the priority level 1 status data recorded in the temporary abnormal data storage area 130 of the SRAM 114 is recorded in the abnormal data storage area 140 of the SRAM 114. Alternatively, the priority level 1 status data recorded in the temporary abnormal data storage area 130 is overwritten on the priority level 2 status data recorded in the abnormal data storage area 140 of the SRAM 114. At this time, the microcomputer 103 erases the status data of priority 1 recorded in the temporary abnormality data storage area 130 of the SRAM 114 from the temporary abnormality data storage area 130. Accordingly, high priority status data can be recorded or overwritten in the abnormal data storage area 140 of the SRAM 114 for storage.

  In this manner, this embodiment can record high priority status data in the SRAM 114. Further, even if the status data has a low priority, it can be recorded in the abnormal data storage area 140 if the abnormality level is changed to a high level.

The example illustrated in FIG. 12 illustrates a processing procedure when an abnormality is detected by a different abnormality detection unit. In addition, the site | part which detected abnormality first is called the site | part a, and the site | part which detected abnormality after the site | part a is called the site | part b. Moreover, the priority of the part a and the part b shall be set to the same level.
Assume that the state data of the part a stored in the ring buffer 113a at the timing shown in step 1 of FIG. 12 is set to a temporary abnormality at the timing O shown in FIG.
The microcomputer 103 records the state data before the occurrence of the abnormality and the state data when the abnormality occurs in the state data of the part a from the ring buffer 113a to the temporary abnormality data storage area 130 of the SRAM 114.

Assume that the state data of the part b stored in the ring buffer 113a at the timing shown in the next step 2 (512 msec has elapsed from step 1) is set to a temporary abnormality at the timing P shown in FIG.
Since the state data of the part a is already recorded in the temporary abnormality data storage area 130 of the SRAM 114, the state data of the part b is not recorded in the temporary abnormality data storage area 130 (priority of the part a and the part b). Because the degree is the same level). Further, at the timing of step 2, among the state data of the part a, the state data after a predetermined time has elapsed since the occurrence of the abnormality is stored in the ring buffer 113a. The microcomputer 103 records the state data of the part a after a predetermined time stored in the ring buffer 113 a in the temporary abnormality data storage area 130 of the SRAM 114.

Next, it is assumed that the state data of the part b is set to this abnormality at the timing Q shown in FIG.
The microcomputer 103 records the state data of the part b in the abnormal data storage area 140 of the SRAM 114. At this time, the microcomputer 103 erases the state data of the part a recorded in the temporary abnormality data storage area 130 of the SRAM 114. Since the status data of the part a and the status data of the part b have the same level of priority, the provisional abnormal state is detected when the state data of the part b determined to be the main abnormality is recorded in the main abnormality data storage area 140. The state data of the part a is deleted.

Next, it is assumed that the state data of the part a is set to this abnormality at the timing R shown in FIG.
The status data of the part a and the status data of the part b are set at the same level of priority, and the status data of the part b is already recorded in the abnormal data storage area 140 of the SRAM 114. 103 does not perform processing.
In the example shown in FIG. 12, the state data that has been determined to be abnormal and has been determined to be preferentially recorded in the SRAM 114. For example, when a communication abnormality occurs between engine ECU 100 and another ECU, a communication abnormality also occurs in communication between other ECUs due to this communication abnormality. Such a phenomenon is called a friend abnormality. Therefore, since it is assumed that the state data of the part a indicates an abnormal value due to the abnormality of the part b in which the abnormality has been previously determined, the state data that has been determined to be abnormal and has been determined to be preferentially stored in the SRAM 114. Record. When it is determined that the abnormality in the part a and the abnormality in the part b are not related, either state data may be recorded as long as the priority is the same. In the example shown in FIG. 12, the state data of the part that has been determined to be abnormal and has been determined to be preferentially recorded in the SRAM 114. It may be recorded in the SRAM 114 after waiting for the determination to be abnormal.

The example shown in FIG. 13 shows a case where the state data of another part b is set to the main abnormality after the state data of the part a is set to the temporary abnormality.
Assume that the state data of the part a stored in the ring buffer 113a at the timing shown in step 1 of FIG. 13 is set to a temporary abnormality at the timing S shown in FIG.
The microcomputer 103 records the state data before the occurrence of the abnormality and the state data when the abnormality occurs in the state data of the part a from the ring buffer 113a to the temporary abnormality data storage area 130 of the SRAM 114.

  At the next step 2 (512 msec has elapsed since step 1), among the state data of the part a, the state data after a predetermined time has elapsed since the occurrence of abnormality is stored in the ring buffer 113a. The microcomputer 103 records the state data of the part a after a predetermined time recorded in the ring buffer 113a in the temporary abnormality data storage area 130 of the SRAM 114.

Next, it is assumed that the state data of the part b stored in the ring buffer 113a at the timing of step 4 (elapsed 512 × 3 msec from step 1) is set to this abnormality at the timing T shown in FIG.
The microcomputer 103 records the state data before the occurrence of the abnormality and the state data when the abnormality occurs in the state data of the part b from the ring buffer 113a to the abnormal data storage area 140 of the SRAM 114. At this time, since the state data of the part a and the state data of the part b are set to the same level of priority, the microcomputer 103 stores the state data of the part a recorded in the temporary abnormality data storage area 130 of the SRAM 114. to erase. Or, it is overwritten by data to be written next.

  At the next step 5 (512 msec has elapsed since step 4), among the state data of the part b, the state data after a predetermined time has elapsed since the occurrence of abnormality is stored in the ring buffer 113a. The microcomputer 103 records the state data of the part a after a predetermined time stored in the ring buffer 113a in the abnormal data storage area 140 of the SRAM 114.

The example shown in FIG. 14 shows a case where the state data of the part a is set to this abnormality before all the state data of the part a is recorded in the SRAM 114.
Assume that the state data of the part a stored in the ring buffer 113a at the timing indicated by step 1 in FIG. 14 is set to a temporary abnormality at the timing U illustrated in FIG.
The microcomputer 103 records the state data before the occurrence of the abnormality and the state data when the abnormality occurs in the state data of the part a from the ring buffer 113a to the temporary abnormality data storage area 130 of the SRAM 114.

  Next, it is assumed that the state data of the part a is set to the abnormal state before 512 msec has elapsed from step 1. For example, in a rotating system such as an engine or transmission, the timing for acquiring a sensor signal is set according to the number of revolutions, so that a temporary abnormality is determined very quickly according to a change in the number of revolutions. Some are also known. The microcomputer 103 records the state data before the occurrence of the abnormality of the part a recorded in the temporary abnormality data storage area 130 of the SRAM 114 and the state data when the abnormality occurs in the abnormality data storage area 140 of the SRAM 114.

  In the next step 2 (512 msec from step 1), the state data of the part a and the state data after a predetermined time has elapsed since the occurrence of the abnormality is stored in the ring buffer 113a. The microcomputer 103 records the status data stored in the ring buffer 113 a after the elapse of a predetermined time in the abnormal data storage area 140 of the SRAM 114.

  In the above-described embodiment, the vehicle state data set to be temporarily abnormal may return to a normal value. In such a case, the count of the normal counter shown in FIG. 4F is started, and when the count value of the normal counter exceeds the normal detection threshold value, it is determined that the vehicle state data is normal. In this case, the vehicle state data stored in the temporary abnormality data storage area 130 may be deleted from the temporary abnormality data storage area 130. Or, it can be overwritten. Specifically, the overwrite permission flag is turned on.

  The embodiment described above is a preferred embodiment of the present invention. However, the present invention is not limited to this, and various modifications can be made without departing from the scope of the present invention.

100 engine ECU
103 Microcomputer (control device)
111 CPU (execution unit)
112 ROM
113 NRAM
113a Ring buffer (one storage unit)
114 SRAM (other storage unit)
115 Input / output unit 120 Abnormality detection location storage area 130 Temporary abnormality data storage area (one storage area)
140 abnormal data storage area (other storage areas)
151 Alarm lamp 152 Injector 153 Igniter 154 Spark plug

Claims (12)

A control device for storing and controlling data related to control when controlling a controlled part,
One storage unit for storing data related to control;
Another storage unit for storing control-related data stored in one storage unit;
Ring buffer control processing for storing data related to control that occurs sequentially in one storage unit by ring buffer control;
An abnormality determination process for determining an abnormality of a predetermined part based on an input signal from the input unit;
A storage control process for storing data related to the control stored in one storage unit in the other storage unit when the abnormality determination is performed by the abnormality determination process;
In the storage control process when a plurality of the abnormality determination processes are executed, the data related to the control stored when determining the abnormality having a high importance is compared with the data related to the control stored when determining the abnormality having a low importance. Preferential storage control processing for preferentially storing control to other storage unit;
And a control unit for executing the control.   The degree of importance is the highest in the law-related anomalies in the law that stipulates that the data related to the control when determining a predetermined abnormality is stored, or the order based on the law, or the rule. The control device according to claim 1, wherein things other than abnormality are lower than legal abnormality.   The degree of importance is the highest in the law-related anomalies in the law that stipulates that the data related to the control when determining a predetermined abnormality is stored, or the order based on the law, or the rule. The control device according to claim 1, wherein the abnormality is other than an abnormality and the emission-related abnormality is the second highest, the abnormality is not a legal abnormality, and the one other than the emission-related abnormality is the second highest.   In the priority storage control process, in the storage control process when a plurality of the abnormality determination processes are executed, the data related to the control stored when determining the abnormality having the high importance in the other storage unit is low in importance. Do not overwrite with control-related data stored when determining an abnormality, or do not delete control-related data stored when determining an abnormality with high importance when determining an abnormality with low importance The control device according to any one of claims 1 to 3, wherein   In the priority storage control process, in the storage control process when a plurality of the abnormality determination processes are executed, the data related to the control stored when determining the abnormality of low importance in the other storage unit is high in importance. When overwriting with data related to control stored when determining an abnormality, or when determining an abnormality with high importance, data related to control stored when determining an abnormality with low importance is deleted. The control device according to any one of claims 1 to 4.   The priority storage control process is a storage control process in which a plurality of the abnormality determination processes are executed. When the importance levels of all the abnormality are the same, the data related to the control stored when the abnormality is first determined. The control device according to any one of claims 1 to 5, wherein the storage device is controlled to be stored in another storage unit preferentially over data related to control stored when other abnormality is determined. The other storage unit has one storage area and another storage area,
The abnormality determination process is determined as a temporary abnormality when an abnormality of a predetermined part is determined based on an input signal from the input unit, and is determined when a predetermined time has elapsed since the provisional abnormality is determined. If it is determined that there is an abnormality, or if it is possible to determine the abnormality of the predetermined part without determining a temporary abnormality based on the input signal from the input unit, it is determined as a main abnormality,
In the storage control process, when the abnormality is determined by the abnormality determination process and the abnormality is determined after a predetermined time has elapsed, the data related to the control stored in one storage unit at the time of the temporary abnormality determination is stored. Store in one storage area in another storage unit, and store data related to control stored in one storage area in another storage unit in the other storage unit at the time of this abnormality determination, or provisional abnormality determination In the case of determining this abnormality without performing, the data related to the control stored in one storage unit at the time of this abnormality determination is stored in another storage area in the other storage unit,
In the storage control process when a plurality of the abnormality determination processes are executed, the priority storage control process determines data related to control stored when determining a temporary abnormality having a high importance, and determines a temporary abnormality having a low importance. When determining this abnormality having a high degree of importance in storage control processing when a plurality of abnormality determination processes are executed or prioritized over data related to the control stored at the time of storage. The data related to the control to be stored is controlled to be stored in another storage unit preferentially over the data related to the control stored when determining this abnormality having low importance. The control device described.   In the priority storage control process, in the storage control process when a plurality of the abnormality determination processes are executed, data related to the control stored when determining a temporary abnormality with high importance in one area of another storage unit, Stored when determining a temporary abnormality with a high degree of importance so as not to be overwritten by data relating to control stored when determining a temporary abnormality with a low degree of importance, or when determining a temporary abnormality with a low degree of importance. The control device according to claim 7, wherein the control-related data is not deleted.   The priority storage control process is a storage control process when a plurality of abnormality determination processes are executed, and data related to control stored when determining a temporary abnormality with low importance in one area of another storage unit. Overwriting with control-related data stored when determining a temporary abnormality with a high degree of importance, or regarding the control stored when determining a temporary abnormality with a low degree of importance when determining a temporary abnormality with a high degree of importance The control device according to claim 7 or 8, which deletes data.   In the priority storage control process, in the storage control process when a plurality of the abnormality determination processes are executed, the data related to the control stored when determining this abnormality having a high importance in another area of another storage unit is stored. Do not overwrite with control-related data stored when determining a low-importance main abnormality, or store a high-priority main abnormality when determining a low-importance main abnormality 10. The control device according to claim 7, wherein the control-related data is not deleted.   In the priority storage control process, in the storage control process in the case where a plurality of the abnormality determination processes are executed, data relating to the control stored when determining the low-priority main abnormality in another area of the other storage unit is stored. Overwriting with the data related to the control stored when determining this abnormality with high importance, or the control stored when determining this abnormality with low importance when determining this abnormality with high importance The control device according to claim 7, which deletes data. A control method for storing and controlling data related to control when controlling a controlled part,
A ring buffer control step of storing data related to sequentially generated control in one storage unit by ring buffer control;
An abnormality determination step of determining an abnormality of a predetermined part based on an input signal from the input unit;
A storage control step of storing data relating to control stored in one storage unit in another storage unit when the abnormality is determined in the abnormality determination step.
In the storage control step when a plurality of the abnormality determination steps are executed, the data related to the control stored when determining the abnormality having a high importance is compared with the data related to the control stored when determining the abnormality having a low importance. A priority storage control step for preferentially storing control to another storage unit;
Control method to execute.

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