JP2006118386A - Electronic control unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic control unit more suitably using operation data serving as data used for predetermined operation even without using a memory having a data holding function regardless of presence or absence of power supply. <P>SOLUTION: In the electronic control unit 100, atmospheric pressure date acquired before engine starting are written in a RAM 114. At this time, reverse data of the atmospheric data which are the data reversed logical values of the atmospheric data are also written in the RAM 114. When voltage of a battery B is lowered by the engine starting, a micro computer 110 is reset. In return from the reset, in the microcomputer 110, the atmospheric data and the reverse data of the atmospheric data are read out from the RAM 114. The reverse data of the atmospheric data thus read out are judged whether or not they are equal to what logically reversed the atmospheric data read out. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electronic control device that includes a memory that realizes a data holding function by power feeding and controls driving of a vehicle.

  An example of this type of electronic control device is an electronic control device that controls the operation of an internal combustion engine. This electronic control device takes in detected values by various sensors for the coolant temperature of the internal combustion engine, the pressure in the intake pipe, the temperature of the intake air, etc., and temporarily stores these detected values in a built-in memory (RAM). The operation of the internal combustion engine is controlled based on the detected value. Specifically, for example, the detected value of the intake pressure sensor is taken in before the internal combustion engine is started and stored in the RAM as the atmospheric pressure, and various controls of the internal combustion engine are performed based on the stored atmospheric pressure.

  On the other hand, in the electronic control device that controls the operation of the vehicle, generally, the operation of the microcomputer that executes various calculations related to the control or the like is not guaranteed due to the voltage drop of the battery as the power supply source. Concerns may arise.

  Therefore, conventionally, there has been proposed one that resets the microcomputer when a battery voltage drop is detected (Patent Document 1). Thereby, even when the voltage of the battery is lowered, it is possible to avoid a situation in which the operation of the microcomputer is not guaranteed. Further, after such a reset, data stored in the built-in RAM is usually cleared. The desired data is newly taken into the RAM, so that the reliability of the data stored in the RAM is improved.

  By the way, although the reliability of the RAM can be improved by performing the reset or the clear process of the RAM in the above-described manner, the following inconveniences associated with these processes cannot be ignored.

  In other words, since an appropriate period is limited as the detection, it may not be possible to newly acquire the detection value after the clear process even though the detection value is desired. Specifically, for example, when the starter motor is started when the internal combustion engine is started and the voltage of the battery is reduced, and the reset is performed accordingly, the atmospheric pressure held in the RAM is detected when the reset is restored. The value is cleared. For this reason, it becomes necessary to newly take in atmospheric pressure with this clearing. However, since the pressure in the intake pipe is greatly different from the atmospheric pressure due to the start of the internal combustion engine, the atmospheric pressure cannot be detected by detecting the pressure in the intake pipe.

  Furthermore, since the data stored in the RAM needs to be acquired again with the clear process, it may be difficult to quickly and appropriately perform various calculations required in the electronic control device.

Conventionally, an electronic control device including a memory having a data holding function regardless of whether or not power is supplied, such as an electrically rewritable nonvolatile memory (EEPROM), has also been realized. In such an electronic control device, the above-described inconvenience can be avoided by storing the data in an EEPROM or the like. However, this is not preferable because it leads to expansion of a storage area such as an EEPROM.
JP-A-7-114401

  The present invention provides an electronic control device that can more appropriately use calculation data, which is data used for a predetermined calculation, even when a memory having a data holding function is not used regardless of whether power is supplied or not. The purpose is to provide.

    In order to achieve such an object, in the first means, electronic control having a function of controlling the operation of the vehicle using a microcomputer provided with a memory that realizes a data holding function by power feeding and resetting the microcomputer. In the apparatus, keyword data that is data for diagnosing the state of data in the memory and operation data that is data for a predetermined operation are written into the memory, and the memory is restored upon return from the reset. The keyword data is read out from the above, and based on the validity of the keyword data, it is determined whether or not the operation data stored in the memory is valid.

  If the memory is placed in a state where the reset is performed, the calculation data stored in the memory may not be valid for use in various calculations. In this regard, in the above configuration, the validity of the data stored in the memory can be determined by using the keyword data. In other words, the keyword data stored in the memory can be read, and the validity of other data stored in the memory can be determined based on the validity of the read keyword data. This makes it possible to determine whether the calculation data is valid. Even when the reset is performed, when it is determined that the calculation data is appropriate, the calculation data can be used as it is for various calculations. Therefore, according to the above configuration, even when a memory having a data holding function is not used regardless of whether power is supplied or not, calculation data that is data used for a predetermined calculation can be used more appropriately. It becomes like this.

  In the means 2, the means 1 has a clear processing function for clearing data stored in the memory when returning from the reset, and the memory includes a storage area that is not cleared in the reset. The keyword data and the calculation data are stored in the storage area that is not cleared.

  Thus, by storing the calculation data in a storage area that is not cleared, it is possible to avoid the calculation data from being cleared even if the calculation data is reset.

  In these means 1 and 2, the condition for performing the reset includes that the power supply voltage to the electronic control device is equal to or lower than a predetermined value, and the memory stores the data as the predetermined value. It is desirable to adopt the configuration of the means 3 for setting higher than the lowest voltage that can be held.

  In this way, by setting the conditions for resetting, it becomes possible to easily determine the reliability of the memory with these conditions. However, in such a case, there is a possibility that the data stored in the memory is correctly held even when the reset is performed. In this respect, the means 3 can suitably exhibit the effects of the means 1 and 2 by using the configuration of the means 1 or the means 2 described above.

  In addition, the means 4 includes a memory that realizes a data holding function by power supply, controls the operation of the vehicle, and establishes a predetermined condition for determining that the reliability of the data stored in the memory has decreased. In the electronic control device having a clear processing function for clearing the data stored in the memory when the memory, the memory includes a storage area that is not cleared by the clear processing function, and in the storage area that is not cleared, Keyword data, which is data for diagnosing the state of data in the memory, and operation data, which is data for a predetermined operation, are written, and when the predetermined condition is satisfied, from the memory Operations that read the keyword data and are stored in the memory based on the validity of the keyword data Chromatography data was made to determine whether valid ones.

  In this way, by using a storage area that is not cleared, it is possible to avoid clearing these calculation data and key code data even when the predetermined condition is satisfied. Furthermore, the validity of the data stored in the memory can be determined by using the keyword data. In other words, the keyword data stored in the memory can be read, and the validity of other data stored in the memory can be determined based on the validity of the read keyword data. This makes it possible to determine whether the calculation data is valid. When it is determined that the calculation data is appropriate using the keyword data, the calculation data can be used for various calculations as it is. Therefore, according to the above configuration, even when a memory having a data holding function is not used regardless of whether power is supplied or not, calculation data that is data used for a predetermined calculation can be used more appropriately. It becomes like this.

  In this means 4, the predetermined condition includes that the power supply voltage to the electronic control device is not more than a predetermined value, and the memory can hold the predetermined value. It is desirable to employ the configuration of the means 5 for setting the voltage higher than the minimum value.

  Further, in the electronic control device that controls the operation of the vehicle by providing a memory that realizes a data holding function by power feeding, the means 6 includes keyword data that is data for diagnosing the state of the data in the memory, and a predetermined data When the operation data, which is data for the operation, is written to the memory, and the power supply voltage to the electronic control device is a predetermined value or less, the keyword data is read from the memory, and the validity of the keyword data Based on the above, it is determined whether or not the operation data stored in the memory is valid.

  In a memory that realizes a data holding function by feeding, generally, the reliability of data stored therein may be lowered due to a drop in the feeding voltage. Further, when the power supply voltage is lowered, there is a concern that the reliability of the electronic control device may be deteriorated, for example, the operation becomes unstable. For this reason, in such an electronic control device, it is effective to use a power supply voltage as an index indicating the decrease in reliability. However, the threshold value of the voltage that determines whether or not the operation of the electronic control device may become unstable is usually higher than the highest voltage value at which the memory cannot hold data. In addition, when evaluating the reliability of data stored in the memory with the power supply voltage, the threshold for this evaluation is usually set higher than the maximum value of the voltage at which the memory cannot hold the data (margin). It is thought that For this reason, even if the power supply voltage is monitored and it is confirmed that the power supply voltage is equal to or lower than the threshold value (predetermined value), data may actually be correctly stored in the memory.

  In this regard, in the above configuration, the validity of the data stored in the memory can be determined by using the keyword data. In other words, the keyword data stored in the memory can be read, and the validity of other data stored in the memory can be determined based on the validity of the read keyword data. This makes it possible to determine whether the calculation data is valid. When it is determined that the calculation data is appropriate, the calculation data can be used as it is for various calculations. Therefore, according to the above configuration, even when a memory having a data holding function is not used regardless of whether power is supplied or not, calculation data that is data used for a predetermined calculation can be used more appropriately. It becomes like this.

  In the means 7, in the means 1 to 6, the keyword data includes data obtained by converting the operation data according to a predetermined rule, and whether the operation data stored in the memory is valid. This determination includes determining whether or not the keyword data stored in the memory is equal to the operation data stored in the memory converted according to the predetermined rule.

  In the means 8, in each of the means 1 to 7, the keyword data is the first data having the predetermined value and the second data obtained by converting the first data according to a predetermined rule. Whether the operation data stored in the memory is valid or not is determined based on whether the second data stored in the memory is the first data stored in the memory Is determined to be equal to the one converted according to the predetermined rule.

  When the data in the memory changes (becomes) from the written value, the same data tends to change in the same way. In this respect, in the means 7, the keyword data has a value different from that of the operation data. Therefore, the operation data is more appropriate than the case where the operation data is stored in two storage areas and compared. It becomes possible to determine whether or not the object is more accurate. In the means 8, since the first data is different in value from the second data, the first data is stored in two storage areas and compared with the case where these are collated. The validity of the keyword data can be judged with higher accuracy. As a result, it is possible to more accurately determine whether or not the calculation data is valid.

  The means 9 further includes a read-only memory in each of the means 1 to 8, and the keyword data is data having a preset value, and the data stored in the read-only memory is I included it.

  By storing the keyword data in the read-only memory in this way, the data itself stored in the memory can be used as information held by the electronic control unit, and the validity of the keyword data based on this information This determination can be performed easily and with high accuracy.

  Further, in the means 10, in each of the means 1 to 9, the pressure detected in the intake pipe of the internal combustion engine that drives the vehicle and detected under a predetermined condition is taken in as the calculation data, and the calculation data Was used as data relating to atmospheric pressure.

  In the above configuration, the pressure in the intake pipe is measured only when the pressure in the intake pipe is substantially equal to the atmospheric pressure, and this can be used as the atmospheric pressure. However, if the reliability of the data stored in the memory is reduced under a situation where the pressure in the intake pipe is different from the atmospheric pressure, the calculation using the atmospheric pressure data cannot be performed appropriately.

  In this regard, in the above configuration, the above inconvenience can be reduced by more appropriately using the data relating to the atmospheric pressure stored in the memory through the configuration of the means 1-9.

  Hereinafter, an embodiment in which an electronic control device according to the present invention is applied to an electronic control device for an internal combustion engine mounted on a motorcycle will be described with reference to the drawings.

  FIG. 1 shows a configuration of the electronic control device and its peripheral portion when the electronic control device of the present embodiment is mounted on the vehicle.

  The electronic control unit (ECU) 100 is driven by power supplied from the battery B. A main switch MSW is provided between the electronic control unit 100 and the battery B, and an electrical connection state between the electronic control unit 100 and the battery B is controlled by turning on / off the main switch MSW. The battery B can also supply power to a starter motor ST that is a prime mover for applying initial rotation to the crankshaft 221 that is an engine output shaft.

  The electronic control unit 100 includes a microcomputer (MCU) 110, a power supply circuit 120, an electrically rewritable nonvolatile memory (hereinafter referred to as EEPROM) 130, and a driver 140 that drives various actuators used to control the internal combustion engine. Yes. Here, the power supply circuit 120 has a function of supplying power from the battery B to each part in the electronic control device 100 and a function of resetting the microcomputer 110 under a predetermined condition. The EEPROM 130 is a predetermined data that is desired to be held regardless of whether or not power is supplied to the electronic control device 100, such as a result of failure diagnosis performed by the electronic control device 100 among data used in the microcomputer 110. Is stored.

  The microcomputer 110 is output from a central processing unit (CPU) 111 that executes various calculations, a read-only memory (hereinafter referred to as ROM) 112 that stores programs executed in the central processing unit 111, and various sensors. An analog / digital converter (A / D converter) 113 that converts an analog signal into a digital signal and a random access memory (hereinafter referred to as RAM) 114 that stores data processed by the central processing unit 111 and the like are provided. Here, the ROM 112 is a memory (nonvolatile memory) having a data holding function regardless of whether power is supplied or not, and the RAM 114 is a memory that realizes a data holding function by power supply.

  Examples of the various sensors include an intake pressure sensor 210 that detects a pressure in an intake pipe of an internal combustion engine, a crank angle sensor 220 that detects a rotation speed of the crankshaft 221, and the like. Here, the crank angle sensor 220 detects the rotation state of the crankshaft 221 by sensing the unevenness of the signal rotor 222 provided on the crankshaft 221 when the crankshaft 221 rotates.

  The value detected by the intake pressure sensor 210 is used to calculate the load of the internal combustion engine. Furthermore, in the present embodiment, the intake pressure detected by the intake pressure sensor 210 is increased under a predetermined condition that the pressure in the intake pipe is assumed to be atmospheric pressure, such as before the internal combustion engine is started. It is used as atmospheric pressure.

  On the other hand, in the present embodiment, when a predetermined condition for determining that the reliability of the data stored in the RAM 114 is lowered is satisfied, the value of each data stored in the RAM 114 is set to “0” (cleared). Process). For data that is desired to be stored in the RAM 114, the reliability of the data stored in the RAM 114 is ensured by performing processing for acquiring the data again.

  However, if the process of clearing the data in the RAM 114 is performed, the data relating to the atmospheric pressure (hereinafter referred to as atmospheric pressure data) may need to be acquired again through the intake pressure sensor 210. However, appropriate atmospheric pressure data cannot be acquired again unless the above-described predetermined condition that the pressure in the intake pipe is assumed to reflect the atmospheric pressure is satisfied.

  Therefore, in the present embodiment, the following configuration is adopted in order to enable appropriate use of atmospheric pressure data even under such circumstances.

  That is, the RAM 114 includes a storage area (hereinafter, cleared area) 114c that is subjected to the clearing process, and a storage area (hereinafter referred to as an uncleared area) 114k that is not subjected to the clearing process. In the uncleared region 114k, atmospheric pressure data (PAIGON), keyword data that is data for diagnosing the state of data in the RAM 114, and the like are stored.

  Here, the keyword data includes “inverted data of atmospheric pressure data (PAIGONB)” which is data obtained by inverting the logic of the atmospheric pressure data, and key code 1 and key code 2 which are data stored in the ROM 112. Consists of. The inversion data of the atmospheric pressure data is generated by the central processing unit 111 according to the procedure of a predetermined program held in the ROM 112 every time the atmospheric pressure data is acquired through the intake pressure sensor 210. The key code 1 and the key code 2 are data having logically inverted values such as “$ AA55” and “$ 55AA”, for example.

  Here, the process of the present embodiment using the inverted data of the atmospheric pressure data and the key code 1 and the key code 2 will be described with reference to FIGS.

  FIG. 2 is a flowchart showing a procedure of processing executed through the central processing unit 111 in accordance with a program stored in the ROM 112. Note that the processing shown here is actually interrupted and activated, for example, at predetermined intervals based on appropriate flag processing, counting processing, and the like.

  The processing shown in FIG. 2 is triggered by the start of power supply to the electronic control device 100 through the main switch MSW (in the figure, power ON) and the reset of the microcomputer 110. Here, the reset is performed when the power supply voltage (for example, 5V) to the electronic control device 100 becomes a voltage value (reset voltage: for example, 4V) at which the operation of the microcomputer 110 is not guaranteed. In the present embodiment, the reset voltage is set higher than the lowest voltage (RAM data holding voltage: for example, 2 V) at which the RAM 114 can hold data.

  When power supply to the electronic control device 100 is started or the microcomputer 110 is reset, initialization processing of the microcomputer 110 is performed in step S10 (initial value setting). This initialization processing includes the above-described processing for clearing data in the area 114c to be cleared shown in FIG. That is, in the present embodiment, it is determined that the reliability of the data stored in the RAM 114 has decreased due to the reset.

  In the subsequent step S20, it is determined whether or not the crankshaft 221 is rotating based on the output signal of the crank angle sensor 220, that is, whether or not the engine is being started by the starter motor ST. When it is determined that the crankshaft 221 is not rotating, the process proceeds to step S40.

  In step S40, the output signal of the intake pressure sensor 210 is captured and written as atmospheric pressure data in the uncleared area 114k, and the keyword data is also written in the uncleared area 114k. In the series of processes composed of step S20 and step S40, it is determined whether or not the data acquired from the intake pressure sensor 210 is data generated by measuring the intake pressure before the crankshaft 221 starts rotating. It cannot be judged. Therefore, in practice, the data acquired from the intake pressure sensor 210 is acquired based on the determination as to whether or not this data is data generated by measuring the intake pressure before the crankshaft 221 starts rotating. It is desirable to perform processing for storing data in the uncleared area 114k.

  On the other hand, if it is determined in step S20 that the crankshaft 221 is rotating, the process proceeds to step S30. In this step S30, it is determined whether or not the atmospheric pressure data stored in the uncleared area 114k is data having usable reliability, in other words, whether it is valid. In the transition to step S30, there is a possibility that the reliability of the data stored in the RAM 114 is lowered (reset state) through a series of processes up to that time, and the crankshaft 221 is Since it is rotating, it is based on the determination that the atmospheric pressure data cannot be obtained again by measurement.

In step S30, the atmospheric pressure data and its inverted data, and the key code 1 and key code 2 are read from the area 114k that is not cleared. Then, the following determinations (a) and (b) are made.
(A) Judgment whether the inverted data of the read atmospheric pressure data is equal to the logically inverted data of the read atmospheric pressure data.
(A) Judgment whether or not the read key code 2 is equal to the logical inversion of the read key code 1.

  Here, when the inverted data of the read atmospheric pressure data is equal to the logically inverted version of the read atmospheric pressure data, it means that the validity of the inverted data of the atmospheric pressure data is high. When the read key code 2 is equal to the logical inversion of the read key code 1, it means that the validity of the key code 1 and the key code 2 is high. The high validity of the key code data means that there is a high possibility that any data stored in the area 114k that is not cleared is valid.

  Incidentally, the above (a) is performed by storing the atmospheric pressure data in the storage areas of two different addresses in the RAM 114 and comparing the atmospheric pressure data stored in these two storage areas. In addition, the validity of these data can be determined with higher accuracy. This is because when the data stored in the RAM 114 changes (is garbled), the same data tends to change in the same way.

  Similarly, by making the key code 1 and the key code 2 logically inverted from each other, the validity of these data can be judged with higher accuracy than when the same data is used. Can be done.

  In the present embodiment, when it is determined in the determinations (a) and (b) that both are equal to the logically inverted one, it is determined that the atmospheric pressure data is valid.

  If it is determined in step S30 that the atmospheric pressure data stored in the area 114k that is not cleared is valid, it is determined in step S50 that the atmospheric pressure data is used in the subsequent processing (the holding value is Reflected).

  On the other hand, if it is determined in step S30 that the atmospheric pressure data stored in the area 114k that is not cleared is not valid, in step S60, default data prepared in advance for atmospheric pressure data is adopted, The default data is written in the storage area for storing the atmospheric pressure data in the area 114k that is not cleared. The value of this default data is a value used when atmospheric pressure cannot be measured through the intake pressure sensor 210, and is set to a value of atmospheric pressure assumed in a normal vehicle traveling environment, for example. The default data is preferably stored in a memory having a data holding function, such as the ROM 112 and the EEPROM 130, regardless of whether power is supplied.

  When one of the processes from step S40 to step 60 is completed in this way, in step S70, various processes for controlling the operation of the internal combustion engine are executed (base process). The processing in step 70 includes processing using the atmospheric pressure data. Actually, the atmospheric pressure data is acquired not only in the series of processes from step S20 to step S40, but also in step S70 under a predetermined condition in which the pressure in the intake pipe is assumed to be atmospheric pressure. It is desirable to perform processing. This condition may be, for example, a condition in which the opening of a throttle valve (not shown) that controls the cross-sectional area related to the flow of intake air in the intake pipe is fully opened.

  Next, the operation caused by the series of processes shown in FIG. 2 will be described with reference to FIG. FIG. 3 is a time chart for the series of processes shown in FIG. Specifically, FIG. 3A shows a state transition of the main switch MSW shown in FIG. 1, FIG. 3B shows a transition of the driving state of the starter motor ST, and FIG. 3C shows an electronic control unit. FIG. 3D shows the transition of the operating state of the microcomputer 110, FIG. 3E shows the transition of the processing performed in the microcomputer 110, and FIG. The change of the pressure in the intake pipe is shown respectively.

  In FIG. 3, when the main switch MSW is turned on at time t <b> 1, power supply to the electronic control device 100 is started, and various processes are executed by the microcomputer 110 accordingly. Specifically, in addition to the process related to the initialization shown in step S10 of FIG. 2, the process related to the acquisition of the intake pressure in step S40 of FIG. 2 and various sensors regarding the operating state and operating environment of the internal combustion engine. Processing for taking in the measurement results (sensor value measurement in FIG. 3A) and the like are executed.

  At time t2, when the starter motor ST is started, the voltage of the battery B that supplies power to the starter motor ST starts to decrease. Further, as the starter motor ST is started, the crankshaft 221 is rotationally driven, so that the pressure in the intake pipe also starts to decrease. When the power supply voltage to the electronic control device 100 becomes equal to or lower than the reset voltage (denoted as Vr in FIG. 3C) at time t3, the power supply circuit 120 shown in FIG. Reset. As shown in FIGS. 3B and 3E, the start timing of the starter motor ST is set so that the processing in steps S20 and S40 of FIG. 2 can be performed once.

  At time t4, the microcomputer 110 returns from the reset and starts the processing shown in FIG. That is, including the process relating to the initialization shown in step S10 of FIG. 2 above, the process of taking in the measurement results of the operating state and operating environment of the internal combustion engine through various sensors (sensor value measurement in FIG. 3A), etc. Is executed. However, as shown in FIG. 3 (c), although the power supply voltage to the electronic control device is lower than the reset voltage, it does not decrease to the RAM data holding voltage (denoted as Vth in FIG. 3 (c)). Therefore, it is considered that the data stored in the uncleared area 114k is valid. In this case, the atmospheric pressure data stored in the area 114k that is not cleared is used as it is without being updated through the series of processes shown in FIG. Therefore, as shown in FIG. 3 (f), the atmospheric pressure data accurately representing the actual atmospheric pressure even when the pressure in the intake pipe after the time t2 is different from the atmospheric pressure indicated by the alternate long and short dash line in the figure. Can be used to control the operation of the internal combustion engine.

  As described above, in the embodiment, by performing the processing shown in FIG. 2, even when the microcomputer 110 is reset due to a decrease in the voltage of the battery B, such as when the internal combustion engine is started, an accurate value of the atmospheric pressure is obtained. By using this, the internal combustion engine can be suitably controlled. In particular, the battery B mounted on a motorcycle as in this embodiment has a small storage capacity, and therefore its voltage is likely to drop when the engine is started. For this reason, the probability of resetting is high. For this reason, this embodiment becomes a structure which can show | play especially suitably the effect produced by the process shown in FIG.

  Further, by determining whether the data stored in the RAM 114 is valid using the keyword data, the atmospheric pressure data can be appropriately stored without securing the storage area of the atmospheric pressure data in the EEPROM 130 or the like. Will be able to use. As exemplified above, the reset voltage is usually set to a value considerably higher than the RAM data holding voltage. For this reason, even if reset is performed, the data stored in the RAM 114 is relatively likely to be used as it is. In other words, it is rare that a reset is made and the data in the RAM 114 is unusable. Under these circumstances, storing the data in the EEPROM 130 to allow the atmospheric pressure data to be used appropriately expands the storage area of the EEPROM 130 for a rare case. End up. On the other hand, in the present embodiment, it is possible to more appropriately use the acquired atmospheric pressure data while avoiding such expansion of the storage area of the EEPROM 130.

  As described above in detail, according to the present embodiment, the following effects can be obtained.

  (1) By determining whether the atmospheric pressure data stored in the RAM 114 is valid based on the validity of the keyword data, the atmospheric pressure data can be used more appropriately.

  (2) The reset voltage was set higher than the RAM data holding voltage. As a result, the reliability of the data stored in the RAM 114 can be maintained high, and as a result, the reliability of the electronic control device 100 can be maintained high.

  (3) The inverted data of the atmospheric pressure data is included in the keyword data. Thereby, the validity of keyword data can be suitably determined.

  (4) The key code 1 and the key code 2 are included in the keyword data. Thereby, the validity of keyword data can be suitably determined.

  (5) Only when it is judged that the validity is high in both (a) and (b), it is possible to make a judgment with higher accuracy by judging that the atmospheric pressure data is valid. it can.

  Each of the above embodiments may be modified as follows.

  Instead of storing both the key code 1 and the key code 2 in the ROM 112 in advance, either one is stored and the other is generated by the same process as the generation of the inverted data of the atmospheric pressure data. It may be.

  In addition, instead of determining whether or not the read key code 2 is equal to the logical inversion of the read key code 1, these key code 1 and key code 2 are stored in the ROM 112, respectively. The key code 1 and the key code 2 may be collated.

  The values of the key code 1 and the key code 2 are not limited to those described above, and may be arbitrary. However, it is desirable that the first data which is arbitrary data and the second data which is data obtained by converting the first data in accordance with a predetermined rule.

  Instead of using the inverted data of the atmospheric pressure data, the atmospheric pressure data may be stored in a plurality of areas of the area 114k that is not cleared, and their validity may be determined by collating with each other. This also makes it possible to determine whether the atmospheric pressure data is valid. However, the keyword data is preferably data obtained by converting atmospheric pressure data according to a predetermined rule. Such converted data includes, for example, the least significant bit of data generated by the sum of each bit of atmospheric pressure data.

  Further, keyword data that is data for diagnosing the state of data in the memory is not limited to the data exemplified in the above embodiment and its modifications, and is predetermined as, for example, information of the electronic control device. It is good also as the data which have the relationship. Here, “information” includes data such as the atmospheric pressure data. That is, by setting the keyword data stored in the memory in such a manner, it is possible to read out the keyword data and determine its validity based on information held by the electronic control device.

  In the above embodiment, the process of determining the validity of all the prepared keyword data and exemplifying that the atmospheric pressure data is valid only when all of these are determined to be valid is exemplified. Not limited to this. For example, the atmospheric pressure data may be determined to be valid when the validity of a predetermined number or more of a plurality of keywords is high. Such determination criteria may be set as appropriate based on the degree of reliability required for atmospheric pressure data.

  In the above embodiment, the atmospheric pressure data is exemplified as the data for determining whether or not the data is valid based on the validity of the keyword data. However, the present invention is not limited to this, but for a predetermined calculation in the microcomputer 110. As long as the calculation data is the data of the above. As such calculation data, for example, there is a learning value that is a value for compensating for a steady deviation that occurs when the control target is controlled to a target due to individual differences or secular changes in the control target. Specifically, the learning value includes an air-fuel ratio learning value that is a value for compensating for a steady deviation between the target air-fuel ratio and the actual air-fuel ratio in air-fuel ratio feedback control, or the electronic throttle valve is fully closed. Some are used for control. Further, the calculation data may be, for example, sequential calculated values when the temperature of the catalytic converter is estimated and calculated based on at least one of the operating state and operating environment of the internal combustion engine. This calculated data includes (a) data generated based on the history of at least one of the driving state and driving environment of the vehicle, and (b) an amount that changes with the passage of time, and its past value is Desirably, the data is about the amount that may be required in an electronic controller.

  The vehicle whose operation is controlled by the electronic control device is not limited to a motorcycle.

  Furthermore, the present invention can be applied not only to the control of the operation of the internal combustion engine but also to an electronic control device used for controlling an automatic transmission (AT), for example.

  In the present embodiment, as a memory for storing calculation data that is data for the predetermined calculation, in a memory that realizes a data holding function by power supply, in a form linked with a power supply state to the electronic control device Although the present invention is applied to a memory to which power is supplied, the present invention is not limited to this. For example, the present invention may be applied to a backup memory that is a memory that realizes a data holding function by power feeding and that is constantly powered regardless of whether power is supplied to the electronic control device. Even in this case, when resetting is performed, there is a concern that the reliability of data stored in the backup memory is lowered because the power supply state from the battery is not normal. The invention is effective.

  The configuration of the electronic control device that includes the memory and controls the driving of the vehicle is not limited to that illustrated in FIG. For example, when the electronic control device has a function of resetting, the conditions for resetting are not limited to those exemplified in the above embodiment. For example, not only at the time of start-up, but generally when there is a concern that the microcomputer malfunctions due to noise, the essential point may be a predetermined condition that reduces the reliability of the electronic control unit. Further, in the case of having a clear processing function for clearing a predetermined area of a memory that realizes a data holding function by power supply, the conditions for performing the clear processing are not limited to those exemplified in the above embodiment, Any predetermined condition may be used as long as it is determined that the reliability of the data stored in the memory that realizes the holding function is reduced. That is, for example, a predetermined condition for determining that the reliability of data has decreased may be provided separately from the condition for resetting. In this case, a normal margin is provided for the threshold value for determining the decrease in the reliability of the memory that realizes the data holding function by the power supply by the value of the power supply voltage. For this reason, even if it is determined that the reliability of the data stored in the memory has decreased because the power supply voltage has fallen below the threshold, the data may actually be stored normally. . In this regard, according to the present invention, even in such a case, it is possible to use this data more appropriately by determining whether or not the data stored in the memory is valid using the keyword data. Will be able to.

It is a block diagram which shows the structure of one Embodiment of the electronic control apparatus concerning this invention. It is a flowchart which shows the procedure of the process performed in the same embodiment. It is a time chart which shows the time transition of the state of each location accompanying the said process.

Explanation of symbols

  ST ... starter motor, B ... battery, 100 ... electronic control unit, 110 ... microcomputer, 114 ... RAM, 114c ... area to be cleared, 114k ... area not to be cleared, 120 ... power supply circuit, 210 ... intake pressure sensor.

Claims (10)

In an electronic control device having a function of resetting the microcomputer while controlling the operation of the vehicle using a microcomputer provided with a memory that realizes a data holding function by power feeding,
The keyword data that is data for diagnosing the state of data in the memory and the operation data that is data for a predetermined operation are written into the memory, and the keyword is read from the memory upon return from the reset. An electronic control device characterized by reading data and determining whether or not the operation data stored in the memory is valid based on the validity of the keyword data. The electronic control device according to claim 1,
When returning from the reset, the memory has a clear processing function for clearing data stored in the memory, and the memory includes a storage area that is not cleared at the time of the reset, and the keyword that is stored in the storage area that is not cleared An electronic control device for storing data and the calculation data.   The conditions under which the reset is performed include that the power supply voltage to the electronic control device is equal to or lower than a predetermined value, and the predetermined value is a minimum value of the voltage at which the memory can hold data. The electronic control device according to claim 1, wherein the electronic control device is set higher than the electronic control device. A memory for realizing a data holding function by power supply is provided to control the driving of the vehicle, and when a predetermined condition is determined that the reliability of the data stored in the memory is lowered, the memory is stored in the memory. In an electronic control device having a clear processing function for clearing stored data,
The memory includes a storage area that is not cleared by the clear processing function, and keyword data that is data for diagnosing the state of data in the memory and a predetermined calculation in the storage area that is not cleared. The calculation data that is the data of
When the predetermined condition is satisfied, the keyword data is read from the memory, and it is determined whether or not the operation data stored in the memory is valid based on the validity of the keyword data. Electronic control device.   The predetermined condition includes that a power supply voltage to the electronic control device is equal to or lower than a predetermined value, and the predetermined value is lower than a minimum voltage at which the memory can hold data. The electronic control device according to claim 4, wherein the electronic control device is set high. In an electronic control device that controls driving of a vehicle with a memory that realizes a data holding function by power feeding,
The keyword data, which is data for diagnosing the state of data in the memory, and the operation data, which is data for a predetermined operation, are written to the memory, and the power supply voltage to the electronic control device is a predetermined value The electronic control device, wherein the keyword data is read from the memory and whether or not the operation data stored in the memory is valid based on the validity of the keyword data when: .   The keyword data includes data obtained by converting the operation data in accordance with a predetermined rule, and whether or not the operation data stored in the memory is valid is determined by keyword data stored in the memory. The electronic control device according to claim 1, further comprising: determining whether or not the operation data stored in the memory is equal to a result obtained by converting the operation data according to the predetermined rule.   The keyword data includes first data that is arbitrary data and second data that is data obtained by converting the first data according to a predetermined rule, and is stored in the memory. Whether the second data stored in the memory is equal to the first data stored in the memory converted according to the predetermined rule. The electronic control device according to claim 1, including a determination.   9. The apparatus according to claim 1, further comprising a non-volatile memory that is a memory having a data holding function regardless of power supply, and the keyword data includes data stored in the non-volatile memory. Electronic control device.   The pressure of the intake pipe of the internal combustion engine that drives the vehicle, which is detected under a predetermined condition, is fetched as the calculation data, and the calculation data is used as data relating to atmospheric pressure. The electronic control apparatus in any one.

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