JP2006330827A - Electronic controller and data storage method for electronic control equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic controller for performing self-diagnosis according to data stored in an SRAM when the abnormal status of electronic control equipment is detected by a sensor in a moving object and the data storage method of the electronic control equipment, and to suppress the increase of the processing load of the CUP of a computer or the like even when the items of data stored in an SRAM or the like are increased when the abnormal status is detected. <P>SOLUTION: This electronic controller is provided with a first data storage means 3 for temporarily storing data to be acquired by a sensor in a moving object and a second data storing means 2 with a backup function for storing predetermined data in the first data storage means with a predetermined sampling interval when the abnormal status of the electronic control equipment 9 is detected, and configured by increasing the number of data to be stored in the second data storage means to shorten the time for sampling data, or decreasing the number of data to be stored in the second storage means to lengthen the time for sampling the data. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  In the present invention, when an abnormal state of an electronic control device in a moving body is detected by a plurality of sensors in the moving body such as a vehicle, predetermined data is stored in an SRAM (Stand-by Random Access Memory). Of an electronic control device having a function of performing a self-diagnosis of the electronic control device based on data stored in the main storage device with a backup function such as a memory) The present invention relates to a data storage method.

  In general, a moving body such as a vehicle is provided with an electronic control device in which a computer, usually called an ECU (Electronic Control Unit), is built. In such an electronic control device, in order to enable a driver or the like to perform a comfortable driving, an electronic control device (for example, an electronically controlled engine) in the moving body is correctly controlled so that the appropriate electronic control device can be appropriately controlled. A self-diagnosis function, that is, a diagnosis function is incorporated.

  In relation to the diagnosis function, an A / F sensor (air-fuel ratio sensor) or a water temperature sensor is provided in a moving body such as a vehicle so that the current state of the electronic control device can be accurately grasped. Various sensors such as an exhaust temperature sensor and the like are attached. The detection signals detected by these various sensors are converted into digital signals by an A / D converter (analog / digital converter) or the like, and then NRAM (Normal Random Access Memory: Normal in the computer) as sensor detection data. Random access memory, usually abbreviated simply as RAM)) etc. Such a main storage device such as an NRAM is generally called a volatile memory, and corresponds to the timing at which each sensor detection data is updated only during the period when the ignition switch of a moving body such as a vehicle is on. The sensor detection data is held at a predetermined cycle. Therefore, when the ignition switch is turned off, all sensor detection data held in the NRAM or the like are lost.

  On the other hand, in the electronic control device in the moving body, some abnormality has occurred in the electronic control device of the moving body based on the sensor detection data held in the NRAM or the like (that is, the electronic control device is in an abnormal state). Is detected from the sensor detection data held in the NRAM or the like (for example, data before and after the timing at which the abnormal state of the electronic control device is detected), The data is stored in a main storage device with a backup function such as SRAM in a computer at a constant sampling interval (for example, 500 msec (milliseconds)).

  Such a main storage device with a backup function such as SRAM is connected to a battery in the mobile body, and a power supply voltage for backup is always supplied from the battery. Therefore, even if the ignition switch is turned off, data stored in the SRAM or the like is not lost. Accordingly, in a maintenance shop or the like, the self-diagnosis of the electronic control device can be performed by reading the data stored in the SRAM or the like and using it for analysis of the cause of the abnormality of the electronic control device.

  As described above, when an abnormal state of an electronic control device in a moving body is detected, the process of saving predetermined data in a main storage device with a backup function such as SRAM is usually called “freeze”. ing.

  In recent years, as software processing by a CPU (Central Processing Unit) of a computer in an electronic control device becomes more sophisticated and complicated, it should be stored in a main storage device such as SRAM during freeze processing. The data items (number of data) tend to increase remarkably.

  However, nevertheless, in the conventional electronic control device, when data is stored in the main storage device such as SRAM when an abnormal state of the electronic control device is detected, a constant sampling interval and a constant sampling time are used. The data of all items is saved. Here, the “sampling interval” refers to a time interval between a time when data is stored in the SRAM or the like at a certain sampling timing and a time when data is stored in the SRAM or the like at the next sampling timing. The “sampling time” refers to a period for continuously storing data in a main storage device such as SRAM before and after the timing at which an abnormal state of the electronic control device is detected.

  For this reason, in the conventional electronic control device, the amount of data actually saved in the main storage device such as SRAM is increased every time the number of data items to be saved in the main storage device such as SRAM increases during the freeze processing. Will increase. Therefore, there has been a problem that the processing load of the CPU when processing the data by the CPU of the computer or the like increases rapidly, making it difficult to process the data at a normal processing speed.

  On the other hand, in the conventional electronic control device, the sensor detection data whose data update timing is relatively late (for example, the data update cycle is long) also at a constant sampling interval and a constant sampling time. Since it is held, there has been a problem that the capacity of the main storage device such as SRAM is wasted. As a result, when an abnormal state of the electronic control device is detected, data cannot be efficiently stored in the main storage device such as SRAM.

  Here, for reference, Patent Document 1 (Japanese Patent Application Laid-Open No. 2004-232498) and Patent Document 2 (Japanese Patent Application Laid-Open No. 7-46676) in which technical contents related to a conventional electronic control device are described are presented.

  In Patent Document 1, a plurality of types of required storage data including sensor detection data from various sensors are grouped based on the magnitude of time change that changes, and the required storage data is stored in a backup RAM for each group. A configuration of a vehicular electronic control device having a diagnosis function in which a backup cycle (sampling interval) for saving is set is disclosed.

  In Patent Document 2, diagnosis duration information specifying the diagnosis duration is incorporated into a request message transmitted to the electronic control device selected from the diagnosis device in accordance with the content of the requested diagnosis process. Thus, in the selected electronic control device, after receiving the request message, a configuration of a communication system for vehicle diagnosis is disclosed in which the diagnosis process is executed until the time specified by the diagnosis duration information is reached. Yes.

  However, in both Patent Document 1 and Patent Document 2, every time the data items to be stored in the main storage device such as SRAM increase during the freeze processing, the data is actually stored in the main storage device such as SRAM. No mention is made of any measures for coping with such problems as the amount of data increases and the processing load on the CPU of the computer increases rapidly.

JP 2004-232498 A Japanese Unexamined Patent Publication No. 7-46676

  The present invention has been made in view of the above problems, and when an abnormal state of an electronic control device in a moving body such as a vehicle is detected, items of data to be stored in a main storage device such as an SRAM are conspicuous. An electronic control device and an electronic control device capable of suppressing an increase in processing load of a CPU of a computer or a waste of a capacity of a main storage device such as an SRAM even when increased It is an object to provide a data storage method.

  In order to solve the above problems, the electronic control device according to the first aspect of the present invention has a function of controlling the electronic control device in the moving body and performing a self-diagnosis of the electronic control device. When an abnormal state of the first data storage means (for example, a main storage device such as an NRAM) for temporarily holding data acquired by a plurality of attached sensors and the electronic control device is detected A second data storage means with a backup function (for example, a main storage device such as SRAM) for storing predetermined data in the first data storage means at a predetermined sampling interval, The number of data items (data items) stored in the second data storage unit is increased, and the sampling time indicating the period for storing the data is shortened.

  Furthermore, the electronic control device according to the second aspect of the present invention has a function of controlling the electronic control device in the moving body to perform self-diagnosis of the electronic control device, and includes a plurality of sensors attached to the moving body. First data storage means for temporarily storing acquired data and predetermined data stored in the first data storage means when the abnormal state of the electronic control device is detected And a second data storage means with a backup function for storing at a sampling interval, and reducing the number of data stored in the second data storage means and providing a period for storing the data It is configured to increase the sampling time shown.

  Furthermore, the electronic control device according to the third aspect of the present invention has a function of controlling the electronic control device in the moving body to perform self-diagnosis of the electronic control device, and includes a plurality of sensors attached to the moving body. First data storage means for temporarily storing acquired data and predetermined data stored in the first data storage means when the abnormal state of the electronic control device is detected Second data storage means with a backup function for storing data at the sampling interval, and the data stored in the second data storage means is saved at an earlier timing. The sampling time indicating the period for performing the above is shortened, and the sampling time is increased for data whose timing of updating the data is late. Sea urchin made.

  Furthermore, the electronic control device according to the fourth aspect of the present invention has a function of controlling the electronic control device in the moving body to perform self-diagnosis of the electronic control device, and includes a plurality of sensors attached to the moving body. First data storage means for temporarily storing acquired data and predetermined data stored in the first data storage means when the abnormal state of the electronic control device is detected And a second data storage means with a backup function for storing at a sampling interval, and the second data storage means according to an abnormality cycle detected when an abnormal state of the electronic control device is detected. It is configured to change the sampling interval when storing the data.

  Furthermore, the electronic control device according to the fifth aspect of the present invention has a function of controlling the electronic control device in the moving body to perform self-diagnosis of the electronic control device, and includes a plurality of sensors attached to the moving body. First data storage means for temporarily storing acquired data and predetermined data stored in the first data storage means when the abnormal state of the electronic control device is detected Second data storage means with a backup function for storing at the sampling interval, the number of data stored in the second data storage means is fixed, and the second data storage means Thus, the sampling interval for storing the data is variably set.

  Preferably, in the electronic control device of the present invention, a sampling number indicating the number of times the data is sampled before and after the timing when the abnormal state is detected is designated by an external inspection tool.

  Furthermore, an electronic control device according to a sixth aspect of the present invention has a function of controlling the electronic control device in the moving body to perform self-diagnosis of the electronic control device, and includes a plurality of sensors attached to the moving body. First data storage means for temporarily storing acquired data and predetermined data stored in the first data storage means when the abnormal state of the electronic control device is detected Second data storage means with a backup function for storing at the sampling interval, and when the data is stored in the second data storage means, the minimum quantization bit (usually, LSB (abbreviated as Least Significant Bit)) is changed to reduce the value of the data.

  Preferably, in the electronic control device of the present invention, the minimum quantization bit of the data value is designated by an external inspection tool.

  Furthermore, an electronic control device according to a seventh aspect of the present invention has a function of controlling the electronic control device in the moving body to perform self-diagnosis of the electronic control device, and includes a plurality of sensors attached to the moving body. First data storage means for temporarily storing acquired data and predetermined data stored in the first data storage means when the abnormal state of the electronic control device is detected And a second data storage means with a backup function for storing at a sampling interval, and when the data is stored in time series in the second data storage means, an abnormal state of the electronic control device is detected. The timing at which the data is stored is changed before and after the timing at which the data is sampled, so that the sampling interval of the data is relatively reduced before and after the timing at which the abnormal state is detected. Constructed.

  Here, “save the data in the second data storage unit in time series” means that the data is stored in the second data storage unit such as SRAM by performing freeze processing at regular intervals. is doing.

  Preferably, in the electronic control device of the present invention, the timing for storing the data before and after the timing when the abnormal state is detected is designated by an external inspection tool.

  Furthermore, an electronic control device according to an eighth aspect of the present invention has a function of controlling the electronic control device in the moving body to perform self-diagnosis of the electronic control device, and includes a plurality of sensors attached to the moving body. First data storage means for temporarily storing acquired data and predetermined data stored in the first data storage means when the abnormal state of the electronic control device is detected And a second data storage means with a backup function for storing at a sampling interval, and when the data is stored in time series in the second data storage means, an abnormal state of the electronic control device is detected. The sampling interval of the data is reduced at a location close to the timing to be detected, and the sampling interval of the data is increased at a location far from the timing at which the abnormal state is detected Constructed.

  Preferably, in the electronic control device of the present invention, the data sampling interval at a location near the timing at which the abnormal state is detected, and the data sampling interval at a location far from the timing at which the abnormal state is detected Is specified by an external inspection tool.

  Further preferably, in the electronic control device of the present invention, a sampling number indicating the number of times the data is sampled before and after the timing at which the abnormal state is detected is designated by an external inspection tool.

  On the other hand, the data storage method of the electronic control device according to the present invention includes a step of temporarily storing data acquired by a plurality of sensors attached to the moving body by the first data storage unit, and an electronic device in the moving body. A step of storing predetermined data in the first data storage unit at a predetermined sampling interval by a second data storage unit having a backup function when an abnormal state of the control device is detected; And performing a self-diagnosis of the electronic control device based on data stored in the second data storage means, and increasing the number of data stored in the second data storage means, The sampling time indicating the period for storing the data is shortened.

  Furthermore, the data storage method of the electronic control device according to the present invention includes a step of temporarily holding data acquired by a plurality of sensors attached to the moving body by the first data storage means, and an electronic control device in the moving body. When the abnormal state is detected, the second data storage means with a backup function stores the predetermined data in the first data storage means at a predetermined sampling interval; and the second data storage means And a step of performing a self-diagnosis of the electronic control device based on data stored in the data storage means, reducing the number of data stored in the second data storage means, and storing the data The sampling time indicating the period for doing so is lengthened.

  Furthermore, the data storage method of the electronic control device according to the present invention includes a step of temporarily holding data acquired by a plurality of sensors attached to the moving body by the first data storage means, and an electronic control device in the moving body. When the abnormal state is detected, the second data storage means with a backup function stores the predetermined data in the first data storage means at a predetermined sampling interval; and the second data storage means A step of performing a self-diagnosis of the electronic control device based on the data stored in the data storage means, and the data stored in the second data storage means is updated at an earlier timing. The sampling time indicating the period for storing the data is shortened, and the data is updated at a later timing. With respect to the data, so as to increase the above-mentioned sampling time.

  Furthermore, the data storage method of the electronic control device according to the present invention includes a step of temporarily holding data acquired by a plurality of sensors attached to the moving body by the first data storage means, and an electronic control device in the moving body. When the abnormal state is detected, the second data storage means with a backup function stores the predetermined data in the first data storage means at a predetermined sampling interval; and the second data storage means Performing a self-diagnosis of the electronic control device based on the data stored in the data storage means, and according to the abnormality cycle detected when the abnormal state of the electronic control device is detected, The sampling interval when the data is stored in the data storage means is changed.

  Furthermore, the data storage method of the electronic control device according to the present invention includes a step of temporarily holding data acquired by a plurality of sensors attached to the moving body by the first data storage means, and an electronic control device in the moving body. When the abnormal state is detected, the second data storage means with a backup function stores the predetermined data in the first data storage means at a predetermined sampling interval; and the second data storage means A step of performing a self-diagnosis of the electronic control device based on data stored in the data storage means, wherein the number of data stored in the second data storage means is fixed, and The sampling interval when the data is stored by the second data storage means is variably set.

  In summary, according to the present invention, first, when an abnormal state of an electronic control device in a moving body such as a vehicle is detected, a predetermined data is stored in a second data storage unit such as an SRAM. The sampling time is shortened by increasing the number of data (data items) of the data, or the sampling time is lengthened by decreasing the number of data of the data.

  As a result, even when the number of data items to be stored in the second data storage unit such as SRAM is significantly increased during the freeze processing, the amount of data actually stored in the second data storage unit such as SRAM Therefore, an increase in processing load on the CPU of the computer is suppressed, and a main storage device such as SRAM can be used efficiently.

  Furthermore, in the present invention, secondly, when an abnormal state of an electronic control device in a moving body such as a vehicle is detected, the predetermined data is stored in the second data storage means such as SRAM. Depending on whether the timing at which each data is updated is early or late, the sampling time indicating the period for storing the data is shortened or lengthened.

  As a result, even when the number of data items to be stored in the second data storage unit such as the SRAM is significantly increased during the freeze processing, the capacity of the second data storage unit such as the SRAM is wasted. Therefore, an increase in processing load of the CPU of the computer is suppressed, and a main storage device such as SRAM can be used efficiently.

  Furthermore, in the present invention, thirdly, when an abnormal state of an electronic control device in a moving body such as a vehicle is detected, the electronic data is stored when the predetermined data is stored in the second data storage means such as SRAM. The sampling interval for storing the data in the second data storage means such as SRAM is changed in accordance with the abnormality cycle related to the abnormal state of the control device.

  As a result, even when the number of data items to be stored in the second data storage unit such as SRAM is significantly increased during the freeze processing, the second data storage such as SRAM is performed according to the abnormality cycle of the electronic control device. Since the sampling interval of data actually stored in the means can be adjusted, a main storage device such as SRAM can be used efficiently.

  Further, in the present invention, fourthly, when an abnormal state of an electronic control device in a moving body such as a vehicle is detected, the predetermined data is stored in the second data storage means such as SRAM. The sampling interval when saving the data is set to be variable while the data item is fixed.

  As a result, the data item to be stored in the second data storage unit such as the SRAM is fixed at the time of the freeze processing, and the data of the second data storage unit such as the SRAM is fully utilized. Can be stored in the second data storage means such as SRAM, so that it is possible to greatly contribute to the analysis of the cause of the occurrence of abnormality in the electronic control device.

  Further, in the present invention, fifthly, when an abnormal state of an electronic control device in a moving body such as a vehicle is detected, the predetermined data is stored in the second data storage means such as SRAM. The minimum quantization bit (LSB) when performing A / D conversion (analog / digital conversion) of the data value is changed so that the value of the data becomes small.

  This makes it possible to efficiently use the main storage device such as SRAM even when the capacity of the second data storage means such as SRAM is relatively small.

  Furthermore, in the present invention, sixthly, when an abnormal state of an electronic control device in a moving body such as a vehicle is detected, predetermined data is stored in a second data storage unit such as SRAM in time series. In addition, the sampling interval of the data is relatively reduced only before and after the timing when the abnormal state of the electronic control device is detected.

  This makes it possible to efficiently use the main storage device such as SRAM even when the capacity of the second data storage means such as SRAM is relatively small.

  Furthermore, in the present invention, seventhly, when an abnormal state of an electronic control device in a moving body such as a vehicle is detected, predetermined data is stored in a second data storage unit such as SRAM in time series. In addition, the sampling interval of the data is reduced near the timing at which the abnormal state of the electronic control device is detected, and the sampling interval of the data is increased as the distance from the timing at which the abnormal state is detected. .

  This makes it possible to efficiently use the main storage device such as SRAM even when the capacity of the second data storage means such as SRAM is relatively small. In addition, since data at a location slightly away from the timing at which the abnormal state of the electronic control device is detected can be stored in the second data storage means such as SRAM, it is possible to analyze the cause of the occurrence of the abnormality in the electronic control device. It will be possible to greatly help.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings (FIGS. 1 to 9).

  FIG. 1 is a block diagram illustrating a configuration of an electronic control device according to an embodiment of the present invention. However, here, the configuration of the electronic control device 1 for controlling the electronic control device 9 such as an electronically controlled engine is simplified. Hereinafter, the same components as those described above are denoted by the same reference numerals.

  As shown in FIG. 1, in a moving body such as a vehicle, an abnormality has occurred in the electronic control device 9 by accurately grasping the current state of the electronic control device 9 such as an electronically controlled engine (that is, electronic control). In order to be able to detect that the device is in an abnormal state), a sensor unit 5 including various sensors is provided.

  As the above-mentioned various sensors, the A / F sensor 50 for sensing the air-to-fuel ratio of an electronically controlled engine, the water temperature sensor 51 for sensing the water temperature used for the electronically controlled engine, etc., the electronically controlled engine, etc. Such as an oxygen concentration sensor 52 for sensing the concentration of oxygen, a knocking sensor 53 for sensing knocking of a vehicle, an oil temperature sensor 54 for sensing the temperature of oil used in an electronically controlled engine, and the like An exhaust temperature sensor 55 for sensing the exhaust temperature, an intake air temperature sensor 56 for sensing the intake air temperature of an electronically controlled engine, the like, a torque sensor 57 for sensing the torque of the vehicle, etc., a crank angle sensor 58 for sensing the crank angle of the vehicle, etc. A vehicle speed sensor 59 for sensing the running speed of the vehicle, a throttle position sensor 60 for sensing the throttle position of the vehicle, etc. It is below.

  The electronic control device 1 shown in FIG. 1 controls the electronic control device 9 such as an electronically controlled engine to perform a self-diagnosis of the electronic control device 9 (that is, a diagnosis function). ROM (Read-only Memory) 10 that stores various programs including a program for executing self-diagnosis, data related to various programs, and sensor detection data acquired by various sensors RAM3, which is a main storage device for temporarily storing data, and when an abnormal state of electronic control device 9 is detected based on sensor detection data or the like, predetermined data in RAM3 is stored at a predetermined sampling interval. And an SRAM 2 which is a main storage device with a backup function for saving the data. Here, the RAM 3 corresponds to the first storage unit of the present invention, and the SRAM 2 corresponds to the second storage unit of the present invention.

  1 includes an input interface circuit 11 that interfaces with various sensors on the input side and the battery 7, and some sensors (for example, the A / F sensor 50, the water temperature sensor 51, and the oil temperature). A / D converter 12 that converts an analog detection signal from a sensor 54 and the like into a digital detection signal, and an output interface circuit 13 that interfaces with an electronic control device 9 on the output side.

  For example, in the electronic control unit 1 of FIG. 1, various sensors such as an A / F sensor 50, a water temperature sensor 51, an oxygen concentration sensor 52, a knocking sensor 53, an oil temperature sensor 54, an exhaust temperature sensor 55, and an intake air temperature sensor 56 are used. The detected analog detection signal is input to the A / D converter 12 via the input interface circuit 11, converted to a digital detection signal by the A / D converter 12, and then input to the CPU 4. On the other hand, digital detection signals detected by the torque sensor 57, the crank angle sensor 58, the vehicle speed sensor 59, the throttle position sensor 60, and the like are input to the CPU 4 via the input interface circuit 11.

  1 uses a battery 7 to supply a constant voltage power supply 70 for supplying a constant voltage to the CPU 4 and RAM 3, etc., and uses the battery 7 to supply a backup power supply voltage to the SRAM 2. A backup power supply 71 is provided. The constant voltage power supply 70 supplies a constant voltage to the CPU 4 and the RAM 3 and the like only during a period when the ignition switch of a moving body such as a vehicle is on. On the other hand, the backup power supply 71 constantly supplies a power supply voltage for backup to the SRAM 2 regardless of whether the ignition switch is on or off.

  Further, in the electronic control unit 1 of FIG. 1, the digital detection signal input to the CPU 4 is temporarily held in the RAM 3 as sensor detection data. As described above, the RAM 3 holds sensor detection data at a period corresponding to the timing at which each sensor detection data is updated only during a period when the ignition switch of a moving body such as a vehicle is on. Yes. Therefore, when the ignition switch is turned off, all sensor detection data held in the RAM 3 are lost. This RAM 3 is usually called a volatile memory.

  On the other hand, when it is detected that an abnormality has occurred in the electronic control device 9 based on the sensor detection data or the like held in the RAM 3, the sensor detection data held in the RAM 3 is determined in advance. The obtained data (for example, data before and after the timing when the abnormal state of the electronic control device is detected) is taken out and stored in the SRAM 2 at a predetermined sampling interval.

  As described above, in the SRAM 2, the backup power supply voltage is always supplied from the backup power supply 71. Therefore, even if the ignition switch is turned off, the data stored in the SRAM 2 is not lost. Therefore, it is possible to perform self-diagnosis of the electronic control device by reading the data stored in the SRAM or the like and using it for analysis of the cause of the occurrence of abnormality in the electronic control device.

  Preferably, in order to save the capacity of the main storage device in the electronic control unit 1, the RAM 3 (volatile memory) is entirely included in the SRAM 2 region as shown in FIG. On the other hand, the RAM 3 is all reset when the power is turned on (when the power is turned on) for the area of the SRAM 2 and used as an NRAM. However, the electronic control device according to the embodiment of the present invention is not necessarily limited to the above configuration.

  Further, an external inspection tool 8 such as a scan tool is connected to the electronic control device 1 of FIG. By this external inspection tool 8, a sampling number indicating the number of times of sampling predetermined data before and after the timing at which the abnormal state of the electronic control device 9 is detected, or predetermined before and after the timing at which the abnormal state is detected. The timing to save the specified data is specified.

  As a preferred embodiment, in the electronic control unit 1 of FIG. 1, when data predetermined at the time of freezing is stored in the SRAM 2, when there are a large number of data (data items) stored in the SRAM 2, the data of the data Conditions are set in advance such that the number is prioritized and the sampling time indicating the period for storing the data is shortened. Such a condition can be set by the CPU 4 reading and executing a program stored in the ROM 10.

  Further, as a preferred embodiment, in the electronic control device 1 of FIG. 1, when storing predetermined data at the time of freezing in the SRAM 2, when the number of data stored in the SRAM 2 is small, the data is stored. A condition is set in advance so that a sampling time indicating a period is prioritized and data having a small number of data is stored. Such a condition can be set by the CPU 4 reading and executing a program stored in the ROM 10.

  Furthermore, as a preferred embodiment, in the electronic control unit 1 of FIG. 1, when data predetermined in freezing is stored in the SRAM 2, the data stored in the SRAM 2 is updated at an earlier timing (that is, the data itself). With regard to data whose update speed is fast), the sampling time indicating the period for storing the data is shortened, and data whose update timing is slow (that is, data whose update speed of the data itself is slow) Is preset in advance so as to increase the sampling time indicating the period for storing the data. Such a condition can be set by the CPU 4 reading and executing a program stored in the ROM 10.

  Furthermore, as a preferred embodiment, in the electronic control device 1 of FIG. 1, when storing predetermined data at the time of freezing in the SRAM 2, according to the period of abnormality detected when the abnormal state of the electronic control device 9 is detected, Conditions for changing the sampling interval when storing the data in the SRAM 2 are set in advance. Such a condition can be set by the CPU 4 reading and executing a program stored in the ROM 10.

  Furthermore, as a preferred embodiment, in the electronic control device 1 of FIG. 1, when storing predetermined data in the SRAM 2 at the time of freezing, the data is stored while the number of data stored in the SRAM 2 is fixed. Conditions are set in advance so that the sampling interval is variable. Such a condition can be set by the CPU 4 reading and executing a program stored in the ROM 10.

  Furthermore, as a preferred embodiment, in the electronic control device 1 of FIG. 1, when storing predetermined data at the time of freezing in the SRAM 2, the minimum value when the A / D converter 12 performs A / D conversion of the value of the data Conditions are set in advance such that the value of the data becomes smaller by changing the quantization bit (LSB). Such a condition can be set by the CPU 4 reading and executing a program stored in the ROM 10.

  Furthermore, as a preferred embodiment, the minimum quantization bit of the value of the data can be specified by an external inspection tool 8 connected to the electronic control unit 1.

  Furthermore, as a preferred embodiment, in the electronic control device 1 of FIG. 1, when pre-set data at the time of freezing is stored in the SRAM 2 in time series, the data before and after the timing when the abnormal state of the electronic control device 9 is detected. Is set in advance so that the sampling interval of the data becomes relatively small only before and after the timing when the abnormal state is detected. Such a condition can be set by the CPU 4 reading and executing a program stored in the ROM 10.

  Further, as a preferred embodiment, in the electronic control device 1 of FIG. 1, when data predetermined at the time of freezing is stored in the SRAM 2 in time series, the electronic control device 9 is close to the timing when the abnormal state of the electronic control device 9 is detected. Conditions are set in advance such that the data sampling interval is minimized, and the data sampling interval is increased as the distance from the timing at which the abnormal state is detected. Such a condition can be set by the CPU 4 reading and executing a program stored in the ROM 10.

  Furthermore, as a preferred embodiment, the ratio of the sampling interval of the data at a location close to the timing at which the abnormal state is detected and the sampling interval of the data at a location far from the timing at which the abnormal state is detected, It can also be specified by an external inspection tool 8 connected to the electronic control unit 1.

  More specifically, the program stored in the ROM 10 in the electronic control unit 1 in FIG. 1 temporarily holds data acquired by a plurality of sensors attached to the moving body by the RAM 3; When an abnormal state of the electronic control device 9 in the moving body is detected, the SRAM 2 stores the predetermined data in the RAM 3 at a predetermined sampling interval, and the electronic data is stored on the basis of the data stored in the SRAM 2. Including a step of performing a self-diagnosis of the control device 9, and when the number of data items (data items) stored in the SRAM 2 is large, the program gives priority to the number of data items and stores the data items The conditions are set so as to shorten the sampling time indicating the period.

  On the other hand, the program stored in the ROM 10 in the electronic control unit 1 in FIG. 1 includes a step of temporarily holding data acquired by a plurality of sensors attached to the moving body by the RAM 3, When an abnormal state of the electronic control device 9 is detected, the SRAM 2 stores the predetermined data in the RAM 3 at a predetermined sampling interval and the electronic control device 9 based on the data stored in the SRAM 2. When the number of data stored in the SRAM 2 is small, the program prioritizes the sampling time indicating the period for storing the data and stores the data with a small number of data. The condition to be set is set.

  On the other hand, the program stored in the ROM 10 in the electronic control unit 1 in FIG. 1 includes a step of temporarily holding data acquired by a plurality of sensors attached to the moving body by the RAM 3, When an abnormal state of the electronic control device 9 is detected, the SRAM 2 stores the predetermined data in the RAM 3 at a predetermined sampling interval and the electronic control device 9 based on the data stored in the SRAM 2. For the data whose data stored in the SRAM 2 is updated early by the above program, the sampling time indicating the period for storing the data is shortened, and the data For data that is updated later, the above sampling time Conditions to be long is set.

  On the other hand, the program stored in the ROM 10 in the electronic control unit 1 in FIG. 1 includes a step of temporarily holding data acquired by a plurality of sensors attached to the moving body by the RAM 3, When an abnormal state of the electronic control device 9 is detected, the SRAM 2 stores the predetermined data in the RAM 3 at a predetermined sampling interval and the electronic control device 9 based on the data stored in the SRAM 2. A sampling interval for storing the data in the SRAM 2 is changed by the program according to the period of abnormality detected when the abnormal state of the electronic control device 9 is detected. The selected conditions are set.

  On the other hand, the program stored in the ROM 10 in the electronic control unit 1 in FIG. 1 includes a step of temporarily holding data acquired by a plurality of sensors attached to the moving body by the RAM 3, When an abnormal state of the electronic control device 9 is detected, the SRAM 2 stores the predetermined data in the RAM 3 at a predetermined sampling interval and the electronic control device 9 based on the data stored in the SRAM 2. The above-described program sets a condition that the sampling interval for storing the data becomes variable while the number of data stored in the SRAM 2 is fixed. .

  Further, in the embodiment of FIG. 1, when the electronic control device 1 is operated using a computer-readable storage medium (or recording medium), a storage such as a hard disk holding the contents of the program as described above. It is preferable to prepare a medium (not shown).

  The storage medium used in the embodiment of FIG. 1 is not limited to the above, but a floppy disk, MO (Magneto-Optical Disk), CD-R (Compact Disk-Recordable), or CD-ROM. It can be provided in the form of various storage media such as portable media such as (Compact Disk Read-only Memory) and other fixed media.

  According to the embodiment of FIG. 1, even when the number of items of data to be stored in the SRAM or the like at the time of freezing is significantly increased, the amount of data actually stored in the SRAM or the like can be reduced. Therefore, the increase in processing load on the CPU of the computer is suppressed, and a main storage device with a backup function such as SRAM can be used efficiently.

  FIG. 2 is a flowchart for explaining the processing flow of the data storage method at the time of freezing according to the present invention. FIG. 3 is a data format diagram showing a data storage pattern when the number of data at the time of freezing is large. 4 is a data format diagram showing a data storage pattern when the number of data at the time of freezing is small, and FIG. 5 is a data format diagram showing a data storage pattern when the sampling time is changed according to the data at the time of freezing. It is.

  In FIG. 2, the CPU (see FIG. 1) of the electronic control device (see FIG. 1) or the like is operated according to the data storage method of the electronic control device of the present invention to save data in the SRAM (see FIG. 1) at the time of freezing. A processing flow for this will be described. On the other hand, in FIGS. 3 to 5, several data storage patterns at the time of freezing are shown by the relationship between time t and data to be stored in the SRAM. 3 to 5, A to I represent the number of data items (data items) to be stored in the SRAM. The greater the number of alphabets, the more the number of data items to be stored in the SRAM. It shows that there are many.

  In the start portion of the flowchart of FIG. 2, analog detection signals detected by some sensors attached to the moving body during the period in which the ignition switch of the moving body such as a vehicle is on are A / After being converted into a detection signal in the digital format by the D converter, it is input to the CPU, and the detection signal in the digital format detected by another sensor is input to the CPU as it is. Further, the digital detection signal input to the CPU is temporarily stored in the RAM (see FIG. 1) as sensor detection data.

  Further, in step S1 of FIG. 2, it is detected whether or not an abnormality has occurred in an electronic control device (see FIG. 1) such as an electronically controlled engine, based on sensor detection data held in the RAM. When it is detected that an abnormality has occurred in the electronic control device and the electronic control device is in an abnormal state, the abnormal state of the electronic control device is detected from the sensor detection data stored in the RAM. Data before and after the timing (that is, data at the time of freezing) are taken out and stored in the SRAM at a constant sampling interval (for example, 500 msec) Sp.

  Further, in step S2, when the data at the time of freezing is stored in the SRAM, depending on the number of data of the data at the time of freezing or the update speed (data update timing) of the data itself, FIG. Data processing during freezing as shown is performed. Such processing is executed until there is no more data to be stored in the SRAM at the time of freezing (the end of the flowchart of FIG. 2).

  Here, it should be noted that the maximum number of bytes (maximum capacity) that can be stored in the SRAM is the same regardless of whether the data to be stored in the SRAM is large or small at the time of freezing. Therefore, the CPU determines whether the priority is given to the number of data at the time of freezing or the sampling time of the data according to the balance between the number of bytes of data to be stored in the SRAM at the time of freezing and the number of bytes of the remaining SRAM. It is judged by.

  More specifically, as shown in the data format diagram of FIG. 3, the number of data at the time of freeze (for example, data A, data B, data C, data D, data E, data F, data G, data H and When the data I) is relatively large, the CPU reads a program stored in the ROM and executes it, giving priority to the number of data to be stored in the SRAM, and sampling time St for storing the data. The condition is set so as to shorten. By storing the data at the time of freezing according to this condition, even if the number of data at the time of freezing is relatively large, all the data can be stored without substantially increasing the amount of data actually stored in the SRAM. It becomes possible to save in SRAM.

  On the other hand, as shown in the data format diagram of FIG. 4, when the number of data at the time of freezing (for example, data A, data B, and data C) is relatively small, the program stored in the ROM is executed by the CPU. By reading and executing, a condition is set in which the sampling time St for storing the data at the time of freezing is preferentially lengthened and all the data with a small number of data are stored in the SRAM. By storing the data at the time of freezing according to these conditions, when the number of data at the time of freezing is relatively small, it is possible to use the main storage device such as SRAM efficiently by increasing the sampling time St. become.

  On the other hand, as shown in the data format diagram of FIG. 5, when the sampling time St is changed according to the update rate of each data at the time of freezing, the program stored in the ROM is read by the CPU and executed. With respect to data having a fast update speed of data stored in the SRAM (that is, data having a fast data update timing), the sampling time St of the data is shortened, and the update speed of the data stored in the SRAM is slow. For data (that is, data whose data is updated later), a condition is set so that the sampling time St of the data is increased. By storing the data at the time of freezing according to this condition, the sampling time St becomes variable depending on the update speed of each data at the time of freezing, and the number of bytes of the SRAM is not wasted. The storage device can be used efficiently.

  For example, in FIG. 5, with respect to the data A having the slowest update speed of the data itself, the sampling time St of the data A is made as long as possible to ensure the amount of data A actually stored in the SRAM. . It is known in advance that the update speed of the data itself increases in the order of data A, data B, data D, and data C. By shortening the data sampling time St in this order, the data is actually stored in the SRAM. Thus, there is no difference in the amount of each data to be processed.

  More specifically, the data sampling time St is set to be short for data whose data is updated relatively early, such as the current value of the inverter current in the electronic control unit. Yes. On the other hand, the data sampling time St is set to be long with respect to data whose data update timing is relatively late, such as information on the position of the transmission gear.

  Furthermore, when changing the sampling time St of the corresponding data according to the period of the abnormality detected when the abnormal state of the electronic control device is detected, the program stored in the ROM is read and executed by the CPU, For data with a short cycle (that is, data with an early timing when an abnormal state is detected), the sampling time St of data actually stored in the SRAM is shortened, and data with a long abnormal cycle (that is, an abnormal state is detected). With respect to data whose timing is late, it is possible to set a condition in which the sampling time St of data actually stored in the SRAM is lengthened.

  FIG. 6 is a data flow diagram for explaining a measure at the time of freezing when an abnormal state is detected. Here, there are exemplified several measures in the case of storing data before and after the timing Td when an abnormal state of the electronic control device is detected at the time of freezing. Note that the upward arrow in FIG. 6 indicates the timing at which the freeze process is performed and the data is stored in the SRAM at time t.

  As shown in FIG. 6, in the measure (1) at the time of freezing, the program stored in the ROM is read out and executed by the CPU, so that the abnormal cycle detected when the abnormal state of the electronic control device is detected is set. Accordingly, a condition is set such that the sampling interval Sp for saving data in the SRAM is changed.

  More specifically, when changing the sampling interval Sp of the corresponding data according to the abnormality cycle detected when the abnormal state of the electronic control device is detected, data with a short abnormality cycle (that is, the abnormal state is detected). Data whose timing is early), the sampling interval Sp of the data actually stored in the SRAM is shortened in accordance with the cycle, and the data having a long abnormal cycle (that is, data whose timing of detecting an abnormal state is late) With respect to the above, the sampling interval Sp of data actually stored in the SRAM is increased in accordance with the period.

  According to such a freeze measure (1), the sampling interval Sp of data actually stored in the SRAM can be adjusted in accordance with the abnormality cycle of the electronic control device. Can be used efficiently.

  On the other hand, in the measure (2) at the time of freezing, the program stored in the ROM is read and executed by the CPU, so that the number of data to be saved in the SRAM at the time of freezing is fixed. Conditions are set such that the sampling interval Sp when storing data is variable as a whole. Here, the data can be stored in the SRAM at the sampling interval Sp specified by the software processing program regardless of the abnormality cycle of the electronic control device.

  Preferably, a plurality of constants are held in a RAM or the like as sampling interval values when data is stored at the time of freezing, and the above constants for each data to be stored in the SRAM at the time of freezing by a program by software processing Are set individually.

  According to the measure (2) at the time of freezing, the data is stored in the SRAM in consideration of the maximum capacity of the SRAM in a state where the number of data to be stored in the SRAM at the time of freezing is fixed. As a result, it is possible to greatly contribute to the analysis of the cause of the abnormality of the electronic control device.

  On the other hand, in the measure (3) at the time of freezing, the sampling number indicating the number of times of sampling the data to be stored in the SRAM before and after the timing Td when the abnormal state of the electronic control device is detected is stored in the electronic control device. It is specified by the connected external inspection tool. Here, the user or the like can specify the sampling number of data to be stored in the SRAM by operating the external inspection tool.

  According to the measure (3) at the time of freezing, the number of samplings can be changed according to the type of abnormal state of the electronic control device by an external inspection tool, which can be very useful for analysis of the cause of the abnormality of the electronic control device. become.

  FIG. 7 is a data conversion diagram for explaining a method of storing data in the SRAM at the time of freezing. Here, a method of storing data in SRAM when analog data is converted to digital data by an A / D converter and the data is stored at the time of freezing is illustrated.

  The upper half of FIG. 7 shows an example of freeze-time data displayed in hexadecimal when the maximum value of data that can be processed by the CPU is 4 bytes. Here, five types of data (for example, 0x0910, 0x0225, 0x1163E, 0x14473, and 0xFFFF7F26) are illustrated, but the present invention is not limited to these data. If these data are stored in the SRAM as they are, the capacity required for the SRAM is greatly increased.

  In order to cope with such an inconvenient situation, in the data storage method (1) in the SRAM of the present invention, as shown in the lower half of FIG. 7, the A / D converter converts the data value A / D. Conditions are set such that the minimum quantization bit (LSB), which is the minimum unit for conversion, is changed so that the value of the data becomes smaller after conversion using the minimum quantization bit. This condition can be set by reading and executing a program stored in the ROM by the CPU.

  More specifically, when the above five types of data are stored in the SRAM, the lower 5 bits of data are truncated by shifting right by 5 bits. The five types of data stored in the SRAM in this way are displayed as hexadecimal data of up to 2 bytes, such as 0x48, 0x11, 0x08B1, 0x0A23, and 0xFBFA (see the lower half of FIG. 7). The value of data after conversion by such a minimum quantization bit is smaller than the value of data at freeze before conversion.

  Preferably, a plurality of constants are held in the RAM or the like as the value of the minimum quantization bit, and the constants are individually set for each data to be stored in the SRAM at the time of freezing by a program by software processing. It is like that.

  According to the data storage method (1) in the SRAM of the present invention, the value of the data is reduced by changing the minimum quantization bit at the time of A / D conversion of the data value at the time of freezing. As a result, the amount of data stored in the SRAM can be reduced, and even when the maximum capacity of the SRAM is relatively small, the main storage device such as SRAM can be used efficiently.

  On the other hand, in the data storage method (2) in the SRAM of the present invention, the minimum quantization bit at the time of A / D conversion of the data value at the time of freeze is an external inspection connected to the electronic control unit. It is specified by the tool. Here, the minimum quantization bit for A / D conversion of the value of the data can be specified by the user or the like operating the external inspection tool. In this case, the SRAM has a value of the minimum quantization bit, and the value of the minimum quantization bit in the SRAM is appropriately changed according to designation from the external inspection tool.

  According to the data storage method (2) in the SRAM of the present invention, even when the maximum capacity of the SRAM is relatively small, the data at the time of freezing can be efficiently stored in the main storage device such as SRAM. It will be very useful for analysis of the cause of equipment malfunctions.

  Here, for reference, a specific example in the case of performing an operation related to the conversion by the minimum quantization bit according to the normal data storage method in the SRAM and the data storage method in the SRAM of the present invention will be described.

  For example, in a normal data storage method in SRAM, the minimum quantization bit (LSB) when performing A / D conversion of sensor detection data detected by a water temperature sensor in a moving body is 5/1024 (V (volt)) ) Is assumed. Here, when the CPU value (value of data stored in the SRAM) is 512, the physical value after A / D conversion of the sensor detection data by the water temperature sensor is obtained by the following formula.

Physical value = CPU value × LSB
In the above example, physical value = 512 × (5/1024)
Therefore, the physical value = 2.5 (V).

  Therefore, since the maximum value of the CPU value is 1024 in the normal data storage method in the SRAM, a maximum capacity of 2 bytes of SRAM is required (the maximum value of 1 byte is 255).

  On the other hand, in the data storage method in the SRAM of the present invention, in order to reduce the amount of data stored in the SRAM as much as possible, the minimum quantization bit when performing A / D conversion of the sensor detection data is set. By changing the value, the CPU value is stored in 1 byte.

  In order to store the CPU value of the maximum value 1024 in 1 byte, the CPU value may be divided by 4. In this case, when 1024 is divided by 4, it becomes 256 and does not fit in 1 byte. However, the difference between 256 and 255 is only 0.02 (V) in terms of physical values, and since this difference is negligibly small, there is no problem even if 256 is regarded as 255.

  From the above viewpoint, in the method of storing data in the SRAM of the present invention, when conversion is performed with the minimum quantization bit at the time of freezing, the CPU value is divided by 4 and then the converted data is stored in the SRAM. ing.

  Note that when data converted by the minimum quantization bit is output to an external inspection tool, the data may be output after being multiplied by four. Alternatively, the data after conversion by the minimum quantization bit may be output to the external inspection tool as it is, and the data may be multiplied by 4 in the external inspection tool.

  FIG. 8 is a data flow diagram (No. 1) for explaining a timing setting method for time series freeze when an abnormal condition is detected, and FIG. 9 is a timing for time series freeze when an abnormal condition is detected. It is a data flowchart (the 2) for demonstrating a setting method.

  Here, several timing setting methods (that is, time-series freeze timing setting method) when data before and after the timing at which an abnormal state of the electronic control device is detected at the time of freezing are stored in the SRAM in time series are illustrated. ing. Here, “time series freeze” means that data is stored in the SRAM by performing freeze processing at regular intervals. Note that the upward arrows in FIGS. 8 and 9 are abbreviated as time-series freeze timing in FIG. 8 and FIG. 9 when time series freeze processing is performed for time t and data is stored in the SRAM. ).

  As shown in FIG. 8, in the time series freeze timing setting method (1), an abnormal state of the electronic control device is detected at the time series freeze by reading and executing the program stored in the ROM by the CPU. The data storage timing is changed before and after the data acquisition timing, and a condition is set such that the sampling interval of the data is relatively reduced only before and after the timing when the abnormal state is detected.

  More specifically, data is always held in the RAM at a small sampling interval (Sp) before and after the timing Td at which an abnormal state of the electronic control device is detected by a program by software processing. When an abnormal state is detected, the data at the time of freezing at a portion that is not before or after the timing Td at which the abnormal state is detected is stored in the SRAM by thinning it out. In this way, the data sampling interval (Sp) at a location that is not before or after the timing Td at which the abnormal state is detected becomes larger than the data sampling interval (Sp) before and after the timing at which the abnormal state is detected. .

  According to such a time series freeze timing setting method (1), since the sampling interval of data at the time of freeze can be relatively reduced only before and after the timing at which an abnormal state is detected, the maximum capacity of the SRAM Even when is relatively small, a main storage device such as SRAM can be used efficiently.

  On the other hand, in the time series freeze timing setting method (2), the data sampling interval before or after the timing at which the abnormal state of the electronic control device is detected during the time series freeze, or the abnormal state is detected. The thinning-out number of the data that is not before and after the timing is specified by an external inspection tool connected to the electronic control device. Here, the data sampling interval before and after the timing at which the abnormal state is detected by the user operating the external inspection tool, or the number of data thinned out before and after the timing at which the abnormal state is detected is determined. Can be specified.

  According to such a time series freeze timing setting method (2), even when the maximum capacity of the SRAM is relatively small, a main storage device such as an SRAM can be used efficiently.

  As shown in FIG. 9, in the time series freeze timing setting method (3), an abnormal state of the electronic control device is detected at the time series freeze by reading and executing the program stored in the ROM by the CPU. The condition is set such that the data sampling interval (Sp) is minimized at a location close to the timing at which the data is sampled and the data sampling interval (Sp) is increased as the distance from the timing at which the abnormal state is detected.

  More specifically, data is always held in the RAM at the smallest sampling interval before and after the timing Td at which the abnormal state of the electronic control device is detected by a program by software processing, and the abnormal state of the electronic control device Is detected, the data at the time of freezing at portions not before and after the timing Td at which the abnormal state is detected is thinned out and stored. However, the number of thinned out data at the time of freezing is reduced as the timing at which an abnormal state is detected is approached.

  Preferably, a plurality of constants are held in the RAM or the like as the maximum sampling interval when data is stored in the SRAM during time series freeze, and each of the data to be stored in the SRAM during time series freeze by a program by software processing The above constants are individually set for the data.

  Alternatively, a plurality of constants may be used as a ratio of the data sampling interval at a location close to the timing at which an abnormal state of the electronic control device is detected and the data sampling interval at a location far from the timing at which the abnormal state is detected. Is stored in a RAM or the like, and the constants are individually set for each data to be stored in the SRAM at the time of the time series freeze by a program by software processing.

  According to such a time-series freeze timing setting method (3), the data sampling interval is minimized at a location close to the timing at which the abnormal state is detected, and the data becomes more distant from the timing at which the abnormal state is detected. Therefore, even when the maximum capacity of the SRAM is relatively small, a main storage device such as an SRAM can be used efficiently. In addition, since data at a location slightly apart from the timing at which the abnormal state is detected can be stored, it is possible to greatly contribute to the analysis of the cause of the abnormality in the electronic control device.

  On the other hand, in the time series freeze timing setting method (4), the maximum sampling interval for storing data in the SRAM during time series freeze is specified by an external inspection tool connected to the electronic control unit. It is like that. Here, by operating the external inspection tool by the user or the like, the maximum sampling interval for storing data in the SRAM at the time series freeze can be designated. In this case, the SRAM has a maximum sampling interval value for storing data during time series freezing, and the maximum sampling interval value in the SRAM is appropriately changed by designation from an external inspection tool. ing.

  Alternatively, in the time series freeze timing setting method (4), the data sampling interval at a location close to the timing at which the abnormal state of the electronic control device is detected and the location far from the timing at which the abnormal state is detected The ratio of the data sampling interval is specified by an external inspection tool connected to the electronic control unit. Here, when a user or the like operates an external inspection tool, the data sampling interval at a location near the timing at which an abnormal state is detected and the sampling interval at the location far from the timing at which the abnormal state is detected You can specify the ratio. In this case, the value of the ratio between the data sampling interval near the timing at which the abnormal state of the electronic control device is detected and the sampling interval of the data at a location far from the timing at which the abnormal state is detected is the SRAM. The ratio value in the SRAM is appropriately changed according to designation from an external inspection tool.

  Alternatively, in the time series freeze timing setting method (4), a sampling number indicating the number of times data is sampled before and after the timing at which an abnormal state of the electronic control device is detected during the time series freeze is connected to the electronic control unit. Specified by the external inspection tool. Here, the user or the like can operate the external inspection tool to specify the sampling number of data to be stored in the SRAM at the time series freeze. In this case, the SRAM has a sampling number value indicating the number of times data is sampled before and after the timing at which the abnormal state of the electronic control device is detected, and the sampling number value in the SRAM is specified by an external inspection tool. Is appropriately changed.

  According to such a time series freeze timing setting method (4), it is possible to efficiently use a main storage device such as an SRAM even when the maximum capacity of the SRAM is relatively small, and the electronic control device. It will be very useful for analysis of the cause of abnormalities.

  The present invention is a computer for controlling an electronic control device such as an electronically controlled engine in a moving body such as a vehicle, and an SRAM is detected when an abnormal state of the electronic control device is detected by a plurality of sensors in the moving body. The present invention is applied to an engine control computer system including an electronic control unit (ECU) having a built-in computer having a function of performing a self-diagnosis of the electronic control device based on sensor detection data stored in a main storage device such as Is possible.

It is a block diagram which shows the structure of the electronic controller which concerns on one Example of this invention. It is a flowchart for demonstrating the processing flow of the data storage method at the time of the freeze which concerns on this invention. It is a data format figure which shows the pattern of data preservation | save when there are many data numbers of the data at the time of freezing. It is a data format figure which shows the pattern of data preservation | save when the data number of data at the time of freezing is small. It is a data format figure which shows the pattern of data preservation | save when changing sampling time with the data at the time of freezing. It is a data flow chart for explaining a measure at the time of freezing when an abnormal state is detected. It is a data conversion figure for demonstrating the data storage method to SRAM at the time of freezing. It is a data flow chart (the 1) for explaining the timing setting method of time series freeze when an abnormal state is detected. It is a data flowchart (the 2) for demonstrating the timing setting method of the time series freeze when an abnormal condition is detected.

Explanation of symbols

1 Electronic Control Unit 2 SRAM (Standby Random Access Memory)
3 RAM (Random Access Memory)
4 CPU (Central Processing Unit)
5 Sensor unit 7 Battery 8 External inspection tool 9 Electronic control device 10 ROM (read-only memory)
11 Input interface circuit 12 A / D converter 13 Output interface circuit 50 A / F sensor (air-fuel ratio sensor)
51 Water Temperature Sensor 52 Oxygen Concentration Sensor 53 Knocking Sensor 54 Oil Temperature Sensor 55 Exhaust Temperature Sensor 56 Intake Air Temperature Sensor 57 Torque Sensor 58 Crank Angle Sensor 59 Vehicle Speed Sensor 60 Throttle Position Sensor 70 Constant Voltage Power Supply 71 Backup Power Supply

Claims (18)

In an electronic control device having a function of controlling the electronic control device in the moving body and performing a self-diagnosis of the electronic control device,
First data storage means for temporarily holding data acquired by a plurality of sensors attached to the moving body;
Second data storage means with a backup function for storing predetermined data in the first data storage means at a predetermined sampling interval when an abnormal state of the electronic control device is detected; Prepared,
The electronic control device is configured to increase the number of data stored in the second data storage unit and shorten a sampling time indicating a period for storing the data. In an electronic control device having a function of controlling the electronic control device in the moving body and performing a self-diagnosis of the electronic control device,
First data storage means for temporarily holding data acquired by a plurality of sensors attached to the moving body;
Second data storage means with a backup function for storing predetermined data in the first data storage means at a predetermined sampling interval when an abnormal state of the electronic control device is detected; Prepared,
The electronic control device is configured to reduce the number of data stored in the second data storage unit and to increase a sampling time indicating a period for storing the data. In an electronic control device having a function of controlling the electronic control device in the moving body and performing a self-diagnosis of the electronic control device,
First data storage means for temporarily holding data acquired by a plurality of sensors attached to the moving body;
Second data storage means with a backup function for storing predetermined data in the first data storage means at a predetermined sampling interval when an abnormal state of the electronic control device is detected; Prepared,
For data whose data stored in the second data storage means is updated early, the sampling time indicating the period for storing the data is shortened, and the timing when the data is updated is delayed. With respect to data, an electronic control device configured to increase the sampling time. In an electronic control device having a function of controlling the electronic control device in the moving body and performing a self-diagnosis of the electronic control device,
First data storage means for temporarily holding data acquired by a plurality of sensors attached to the moving body;
Second data storage means with a backup function for storing predetermined data in the first data storage means at a predetermined sampling interval when an abnormal state of the electronic control device is detected; Prepared,
The sampling interval for storing the data in the second data storage unit is changed in accordance with an abnormality cycle detected when an abnormal state of the electronic control device is detected. Electronic control device. In an electronic control device having a function of controlling the electronic control device in the moving body and performing a self-diagnosis of the electronic control device,
First data storage means for temporarily holding data acquired by a plurality of sensors attached to the moving body;
Second data storage means with a backup function for storing predetermined data in the first data storage means at a predetermined sampling interval when an abnormal state of the electronic control device is detected; Prepared,
The number of data items stored in the second data storage unit is fixed, and the sampling interval when the data is stored by the second data storage unit is variably set. Electronic control device.   6. The electronic control device according to claim 4, wherein a sampling number indicating the number of times the data is sampled before and after the timing at which the abnormal state is detected is designated by an external inspection tool. . In an electronic control device having a function of controlling the electronic control device in the moving body and performing a self-diagnosis of the electronic control device,
First data storage means for temporarily holding data acquired by a plurality of sensors attached to the moving body;
Second data storage means with a backup function for storing predetermined data in the first data storage means at a predetermined sampling interval when an abnormal state of the electronic control device is detected; Prepared,
An electronic control device, wherein the data value is decreased by changing a minimum quantization bit of the data value when the data is stored in the second data storage means.   8. The electronic control unit according to claim 7, wherein the minimum quantization bit of the data value is designated by an external inspection tool. In an electronic control device having a function of controlling the electronic control device in the moving body and performing a self-diagnosis of the electronic control device,
First data storage means for temporarily holding data acquired by a plurality of sensors attached to the moving body;
Second data storage means with a backup function for storing predetermined data in the first data storage means at a predetermined sampling interval when an abnormal state of the electronic control device is detected; Prepared,
When storing the data in time series in the second data storage unit, the timing for storing the data is changed before and after the timing when the abnormal state of the electronic control device is detected, and the abnormal state is detected. An electronic control device, characterized in that the data sampling interval is relatively small before and after the timing.   10. The electronic control device according to claim 9, wherein the timing for storing the data before and after the timing at which the abnormal state is detected is designated by an external inspection tool. In an electronic control device having a function of controlling the electronic control device in the moving body and performing a self-diagnosis of the electronic control device,
First data storage means for temporarily holding data acquired by a plurality of sensors attached to the moving body;
Second data storage means with a backup function for storing predetermined data in the first data storage means at a predetermined sampling interval when an abnormal state of the electronic control device is detected; Prepared,
When storing the data in time series in the second data storage unit, the sampling interval of the data is reduced near a timing at which the abnormal state of the electronic control device is detected, and the abnormal state is detected. An electronic control device configured to increase the sampling interval of the data at a location far from the timing.   A ratio between the sampling interval of the data near the timing at which the abnormal state is detected and the sampling interval of the data at a location far from the timing at which the abnormal state is detected is designated by an external inspection tool. The electronic control unit according to claim 11, wherein the electronic control unit is configured as described above.   12. The electronic control device according to claim 9, wherein a sampling number indicating the number of times the data is sampled before and after the timing at which the abnormal state is detected is designated by an external inspection tool. . Temporarily storing data acquired by a plurality of sensors attached to the moving body by a first data storage unit;
When an abnormal state of the electronic control device in the moving body is detected, predetermined data in the first data storage unit is stored at a predetermined sampling interval by the second data storage unit having a backup function. Steps,
Performing a self-diagnosis of the electronic control device based on data stored in the second data storage means,
A data storage method for an electronic control device, wherein the number of data stored in the second data storage means is increased, and a sampling time indicating a period for storing the data is shortened. Temporarily storing data acquired by a plurality of sensors attached to the moving body by a first data storage unit;
When an abnormal state of the electronic control device in the moving body is detected, predetermined data in the first data storage unit is stored at a predetermined sampling interval by the second data storage unit having a backup function. Steps,
Performing a self-diagnosis of the electronic control device based on data stored in the second data storage means,
A data storage method for an electronic control device, characterized in that the number of data stored in the second data storage means is reduced and a sampling time indicating a period for storing the data is lengthened. Temporarily storing data acquired by a plurality of sensors attached to the moving body by a first data storage unit;
When an abnormal state of the electronic control device in the moving body is detected, predetermined data in the first data storage unit is stored at a predetermined sampling interval by the second data storage unit having a backup function. Steps,
Performing a self-diagnosis of the electronic control device based on data stored in the second data storage means,
For data whose data stored in the second data storage means is updated early, the sampling time indicating the period for storing the data is shortened, and the timing when the data is updated is delayed. With regard to data, a method for storing data in an electronic control device, wherein the sampling time is lengthened. Temporarily storing data acquired by a plurality of sensors attached to the moving body by a first data storage unit;
When an abnormal state of the electronic control device in the moving body is detected, predetermined data in the first data storage unit is stored at a predetermined sampling interval by the second data storage unit having a backup function. Steps,
Performing a self-diagnosis of the electronic control device based on data stored in the second data storage means,
An electronic control device characterized in that the sampling interval for storing the data in the second data storage means is changed in accordance with an abnormality cycle detected when an abnormal state of the electronic control device is detected. Data storage method. Temporarily storing data acquired by a plurality of sensors attached to the moving body by a first data storage unit;
When an abnormal state of the electronic control device in the moving body is detected, predetermined data in the first data storage unit is stored at a predetermined sampling interval by the second data storage unit having a backup function. Steps,
Performing a self-diagnosis of the electronic control device based on data stored in the second data storage means,
The number of data items stored in the second data storage unit is fixed, and the sampling interval when the data is stored by the second data storage unit is variably set. Data storage method for electronic control equipment.

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