JP5958329B2 - Electronic control unit - Google Patents

Electronic control unit Download PDF

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JP5958329B2
JP5958329B2 JP2012284580A JP2012284580A JP5958329B2 JP 5958329 B2 JP5958329 B2 JP 5958329B2 JP 2012284580 A JP2012284580 A JP 2012284580A JP 2012284580 A JP2012284580 A JP 2012284580A JP 5958329 B2 JP5958329 B2 JP 5958329B2
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sensor
information
fuel temperature
pressure
abnormal
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JP2014126007A (en
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恭雅 石川
恭雅 石川
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株式会社デンソー
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/40Engine management systems

Description

  The present invention relates to an electronic control device that detects an abnormality of a pressure sensor installed in an injector in order to detect fuel pressure in an injector installed in each of a plurality of cylinders.

  In a compression ignition type internal combustion engine such as a diesel engine, for example, in order to reduce NOx and unburned gas in exhaust gas, it is required to control fuel injection from an injector based on a combustion state in a combustion chamber. ing. The combustion state in the combustion chamber can be detected from the fuel injection start timing, the injection end timing, the injection rate, and the like.

  The injection start timing, the injection end timing, and the injection rate can be detected based on a change in the pressure of fuel injected from the injector. In order to detect the fuel pressure with high accuracy, it is desirable to detect the fuel pressure as close to the injector as possible. Therefore, a technique is known in which a pressure sensor is installed in the injector and a change in fuel pressure in the injector is directly detected.

  In this technique, in order to prevent the fuel injection from being controlled based on the fuel pressure detected by the abnormal pressure sensor in which the output characteristic indicating the relationship between the output voltage and the fuel pressure due to secular change or the like greatly deviates from the initial characteristic. It is important to determine whether the pressure sensor is normal or abnormal by the electronic control unit.

  For example, the pressure sensor determined to be normal becomes abnormal by comparing the fuel pressure detected by each pressure sensor determined to be normal with the fuel pressure detected by another pressure sensor determined to be normal. It can be considered to determine whether or not. And about the pressure sensor determined to be abnormal, it excludes from the object of abnormality detection, and memorize | stores the abnormality information which shows abnormality.

  When an abnormal pressure sensor is detected during one trip from turning on to off of the ignition switch, the EEPROM (registered trademark) provided in the electronic control unit is used to exclude the abnormal pressure sensor from the abnormality detection target in the next trip. It is desirable to store abnormality information in a rewritable nonvolatile memory such as.

  By storing the information in a rewritable nonvolatile memory, the abnormality information can be stored and retained even if the battery is replaced and the power supply is shut off before the next trip. And the injector in which the abnormal pressure sensor was installed can be specified by reading the abnormal information memorize | stored at the time of the trip start which turned on the ignition switch.

  However, when the electronic control device is replaced, abnormal information indicating that the pressure sensor is abnormal is not stored in the EEPROM of the electronic control device after replacement, and thus the abnormal information is lost. For example, when the pressure sensor of two cylinders, which is half of the four cylinders, is determined to be abnormal, and the pressure sensor determined to be abnormal because the abnormality information has been lost due to the replacement of the electronic control device is used for abnormality detection, There is a risk that a normal pressure sensor may be erroneously determined to be abnormal.

  Therefore, as disclosed in Patent Document 1, it is conceivable to store the abnormality information of the actuator in a rewritable nonvolatile control memory installed outside the electronic control device instead of the electronic control device. Patent Document 1 exemplifies a configuration in which a control memory is installed in the actuator itself.

  As a result, even if the electronic control unit is replaced, for example, when the ignition switch is turned on, the actuator abnormality information is read from the external control memory, and if the abnormality information indicates that the actuator is abnormal, an appropriate process is performed. It can be carried out.

JP 2008-57413 A

  However, in the configuration in which processing for the actuator is determined based on the abnormality information read from the external control memory, there is a problem that when the external control memory fails, there is no means for determining whether the actuator is normal or abnormal. is there.

  The present invention has been made to solve the above-described problem, and can be rewritten even if the power supply from the battery is cut off, the electronic control unit or the injector is replaced, or the abnormality information is stored. An object of the present invention is to provide an electronic control device that appropriately detects an abnormality of a pressure sensor installed in an injector even if a part of a non-volatile memory fails.

The electronic control device of the present invention detects an abnormality of a pressure sensor installed in an injector in order to detect fuel pressure in an injector installed in each of a plurality of cylinders. Then, the first sensor information stored in the first non-volatile memory and the injector are provided for the pressure detection value representing either the output value of the pressure sensor or the fuel pressure acquired based on the output value. Pressure detection values respectively detected by pressure sensors to be determined that are set to normal in the second sensor information stored in the second non-volatile memory and indicating whether the pressure sensor is normal or abnormal , The first sensor information and the second sensor information are compared with pressure detection values detected by other pressure sensors set to normal to determine whether the determination target pressure sensor is normal or abnormal . 1 Sensor abnormality determination is performed.

  As sensor information indicating whether the pressure sensor is normal or abnormal, the first sensor information is stored in a rewritable first nonvolatile memory included in the electronic control device, and the second sensor information is rewritable included in the injector. Stored in the second non-volatile memory.

Information setting means, the pressure sensor to be determined by the first sensor abnormality determination is determined the abnormality determining means is abnormal, the first sensor information corresponding to the abnormal pressure sensor is set abnormally, abnormal pressure sensor The second sensor information stored in the second nonvolatile memory of the injector in which is installed is abnormally set.

The abnormality determining means determines that the pressure sensor determined by the information determining means that the first sensor information and the second sensor information are normal and coincides when the ignition switch is turned on is normal, The second sensor abnormality determination is performed to determine that the pressure sensor determined by the information determination unit as abnormal if the one sensor information and the second sensor information coincide with each other .

  According to this configuration, the first sensor information and the second sensor information indicating whether the pressure sensor installed in the injector is normal or abnormal are stored in the rewritable nonvolatile memory respectively included in the electronic control device and the injector. Since it is stored, the first sensor information and the second sensor information can be retained even when the battery is replaced.

  Thereby, for example, a pressure sensor in which the first sensor information and the second sensor information are abnormally matched is excluded from the abnormality detection target, and the first sensor information and the second sensor information are normally matched. By using the pressure sensor as a target of abnormality detection, abnormality detection of the pressure sensor installed in the injector can be appropriately executed.

  In addition, when the abnormality of the pressure sensor is detected and the first sensor information and the second sensor information are set abnormally, the electronic control unit or the injector is exchanged between trips. The abnormality information of the rewritable nonvolatile memory remains the initial value and is not set abnormally. Also in this case, at the start of the trip when the ignition switch is turned on, the first sensor information and the second sensor information are read, and the sensor abnormality determination is performed based on the matching first sensor information and second sensor information. Therefore, abnormality detection can be performed appropriately.

  Furthermore, even if one of the rewritable nonvolatile memories of the electronic control unit or the injector fails, the pressure sensor is normal based on the sensor information stored in the other rewritable nonvolatile memory that has not failed. It can be determined whether it is present or abnormal.

The block diagram which shows the electronic control apparatus and injector by 1st Embodiment. The flowchart which shows the process at the time of abnormality of a pressure sensor. The characteristic view which shows the relationship of the output characteristic of an abnormal sensor and a normal sensor. The list which shows the setting state of the sensor information for every cylinder. The characteristic view explaining correction of the output characteristic of an abnormal pressure sensor. The time chart which shows the access timing of sensor information. The flowchart which shows the sensor information processing at the time of ON of an ignition switch. The flowchart which shows the process at the time of abnormality of the fuel temperature by 2nd Embodiment. The flowchart which shows the fuel temperature information processing at the time of ON of an ignition switch.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
FIG. 1 shows a fuel injection control system 2 of the first embodiment. The fuel injection control system 2 performs, for example, injection control for each cylinder of a four-cylinder diesel engine for automobiles (hereinafter also simply referred to as “engine”). The fuel injection control system 2 includes an injector 10 and an electronic control unit (ECU) 20.

  The injector 10 is, for example, a known electromagnetically driven injection valve that controls the lift of the nozzle needle that opens and closes the nozzle hole with the pressure in the control chamber, and is installed in each cylinder. The injector 10 includes a pressure sensor 12 and an EEPROM 14.

  The pressure sensor 12 installed in the injector 10 has a known bridge circuit and the like, and the fuel injected from the injector 10 by detecting the fuel pressure in the injector 10 based on the output voltage of the bridge circuit. Detect the pressure. The EEPROM 14 stores initial characteristics indicating the relationship between the output voltage of the pressure sensor 12 installed in each injector 10 and the fuel pressure.

  The pressure sensor 12 of the injector 10 and the ECU 20 are connected by a dedicated line. Further, the EEPROM 14 of the injector 10 and the ECU 20 are connected by a network 100 such as LIN.

The ECU 20 is mainly composed of a microcomputer centered on a CPU 22, a RAM 24, a ROM 26, an EEPROM 28, and the like.
ECU20 performs injection control with respect to the injector 10 when CPU22 runs the control program memorize | stored in ROM26 or EEPROM28.

  The ECU 20 acquires the fuel pressure based on the output voltage from the initial characteristics indicating the relationship between the output voltage of the pressure sensor 12 of each injector 10 and the fuel pressure, and is injected from each injector 10 based on the change in the fuel pressure. The fuel injection start timing, injection end timing, and injection rate are detected. ECU 20 estimates the combustion state in the combustion chamber from the detected injection start timing, injection end timing, and injection rate, and controls fuel injection from injector 10 based on this combustion state.

  Next, sensor abnormality processing and sensor information processing in the first embodiment will be described with reference to FIGS. In the flowcharts of FIGS. 2 and 7, “S” represents a step.

(Processing when the sensor is abnormal)
The sensor abnormality process in FIG. 2 is a predetermined timing that is as close as possible to the injection start timing, in the injection control process that is repeatedly executed by the ECU 20, before the injector 10 in which the pressure sensor 12 that is subject to abnormality determination is installed. Is executed.

  In the pressure sensor 12 installed in the injector 10, the output characteristic indicating the relationship between the output voltage and the fuel pressure may deviate from the initial characteristic due to a change with time. If this deviation becomes large, the injection control of the injector 10 cannot be properly executed based on the fuel pressure detected by the pressure sensor 12.

  Therefore, it is necessary to detect an abnormality in the pressure sensor 12. For the injector 10 in which the pressure sensor 12 in which an abnormality has been detected is installed, the fuel injection is stopped, or the fuel pressure is detected by correcting the output characteristic deviating from the initial characteristic, and is detected by correcting. Processing such as continuing injection control based on the fuel pressure is performed.

  In the sensor abnormality determination of S400, the ECU 20 determines whether the pressure sensor 12 including the determination target pressure sensor 12 is determined to be normal at a predetermined timing before the injector 10 in which the determination target pressure sensor 12 is installed injects fuel. Get the output voltage that is the output value.

  ECU20 is installed in the injector 10 which injects fuel next about the acquired output voltage, The voltage of the output voltage of the pressure sensor 12 which is the determination object this time, and the average value of the output voltage of the other pressure sensor 12 By calculating the deviation as the detected value deviation, the output voltage of the normal pressure sensor 12 is compared.

As shown in FIG. 3, when the voltage deviation of the output voltage exceeds a predetermined allowable range indicated by a dotted line, the ECU 20 determines that the pressure sensor 12 to be determined is abnormal.
First sensor information and second sensor information are stored in the EEPROM 28 of the ECU 20 and the EEPROM 14 of the injector 10 as sensor information indicating whether each pressure sensor 12 is normal or abnormal. As shown in FIG. 4, in the initial state, the sensor information of the EEPROMs 14 and 28 is set to “0” indicating normality.

  The pressure sensor 12 to be detected by the ECU 20 in S400 is the pressure sensor 12 in which the sensor information stored in the EEPROM 14 and the EEPROM 28 matches “normal”. Pressure sensors 12 whose sensor information matches with “abnormal” are excluded from the targets of abnormality detection.

  When the pressure sensor 12 to be determined is abnormal (S400: Yes), the ECU 20 sets the sensor information corresponding to the injector 10 in which the abnormal pressure sensor 12 is installed in the EEPROMs 14 and 28 to “1” indicating abnormality. (S402). FIG. 4 shows that the pressure sensor 12 of the injector # 1 is determined to be abnormal.

  Further, the ECU 20 determines the abnormal fuel pressure detected based on the output voltage of the abnormal pressure sensor 12 and the normal fuel pressure detected based on the output voltage of the other pressure sensor 12 determined to be normal. The pressure deviation from the average value is stored in at least the EEPROM 28 of the EEPROMs 14 and 28 (S404).

  The ECU 20 detects the fuel pressure by correcting the output characteristic deviating from the initial characteristic based on the pressure deviation stored in the EEPROM 28 for the abnormal pressure sensor 12, as shown in FIG. The injection control may be continued based on the fuel pressure.

  Note that the sensor information in the EEPROMs 14 and 28 may be set to abnormal at the write timing 1 shown in FIG. 6 when the pressure sensor 12 is determined to be abnormal, as in the sensor abnormality process of FIG. Like the writing timing 2 shown, the ignition switch is turned off, and the sensor information may be written into the EEPROMs 14 and 28 at the same timing as when other information other than the sensor information is written into the EEPROMs 14 and 28.

  In the case of the write timing 2, the sensor information is stored in the RAM 24 until the ignition switch is turned off, and the sensor information in the RAM 24 is written into the EEPROMs 14 and 28 when the ignition switch is turned off.

(Sensor information processing)
The sensor information processing in FIG. 7 is executed when the ignition switch is turned on.
As shown in the read timing of FIG. 6, when the ignition switch is turned on, the ECU 20 reads sensor information from the EEPROM 14 of the injector 10 and the EEPROM 28 of the ECU 20 for each cylinder (S410), and the sensor of each cylinder for all cylinders. It is determined whether the information matches “normal” or “abnormal” (S412).

  When the sensor information is the same for all cylinders (S412: Yes), the ECU 20 shifts the process to S422. In S422, the ECU 20 excludes the pressure sensors 12 of the cylinders in which the sensor information in the EEPROM 14 and the EEPROM 28 is the same as “abnormal” from the abnormality detection target, and performs subsequent abnormality detection.

  When there is a cylinder in which sensor information does not match between the EEPROM 14 and the EEPROM 28 (S412: No), the ECU 20 stores the pressure sensor 12 in which the sensor information does not match and the normality or abnormality is not determined in the EEPROM 28 of the ECU20. It is determined whether or not the first sensor information is “abnormal” (S414).

  When the first sensor information is “abnormal” (S414: Yes), the ECU 20 is stored in the EEPROM 14 of the injector 10 while the first sensor information stored in the EEPROM 28 of the ECU 20 is “abnormal”. Since the second sensor information is “normal”, it is determined that the injector 10 may be replaced, and the process proceeds to S416.

  When the first sensor information is “normal” (S414: No), the ECU 20 is stored in the EEPROM 14 of the injector 10 while the first sensor information stored in the EEPROM 28 of the ECU 20 is “normal”. Since the second sensor information is “abnormal”, it is determined that the first sensor information stored in the EEPROM 28 is changed to the initial value “normal” after the ECU 20 is replaced, and the process proceeds to S426. In this case, the corresponding pressure sensor 12 is abnormal.

  In S416, the ECU 20 calculates a voltage deviation between the average value of the output voltages of the other pressure sensors 12 whose sensor information is “normal” and the same, and the output voltage of the pressure sensor 12 whose normality or abnormality is undetermined. . Each output voltage for calculating the voltage deviation at this time is acquired at the above-described predetermined timing before the injector 10 in which the pressure sensor 12 whose normality or abnormality is undetermined is installed injects fuel.

  When the voltage deviation calculated in S416 exceeds the predetermined allowable range indicated by the dotted line shown in FIG. 3 (S418: Yes), the ECU 20 determines that the pressure sensor 12 whose normality or abnormality is undetermined is abnormal. Then, the second sensor information stored in the EEPROM 14 of the injector 10 is set to “abnormal” (S420). Then, the ECU 20 executes the process of S422 described above.

  If the voltage deviation calculated in S416 is within the predetermined allowable range (S418: No), the ECU 20 determines that the pressure sensor 12 whose normality or abnormality is undetermined is normal and is stored in the EEPROM 28 of the ECU20. The first sensor information is set to “normal” (S424), and the process of S422 described above is executed.

  In S426, the ECU 20 sets the first sensor information stored in the EEPROM 28 of the ECU 20 to "abnormal" in accordance with the second sensor information stored in the EEPROM 14 of the injector 10, and executes the above-described processing of S422. To do.

  In the first embodiment described above, the output voltage of the pressure sensor 12 determined to be normal is compared, and sensor information indicating whether the pressure sensor 12 is normal or abnormal is obtained from the EEPROM 14 of the injector 10 and the ECU 20. It was stored in both the EEPROM 28. Thereby, even when the battery is replaced, the sensor information of each pressure sensor 12 can be held in each injector 10 and ECU 20. Therefore, the abnormality of the pressure sensor 12 can be appropriately detected based on the sensor information stored in each injector 10 and the ECU 20.

  In addition, even if the ECU 20 or the injector 10 is replaced between trips after the abnormality of the pressure sensor 12 is detected and the sensor information of the EEPROMs 14 and 28 is set abnormally, the trip in which the ignition switch is turned on. Sensor information is read from the EEPROMs 14 and 28 at the start of the operation, and abnormality detection is performed for the pressure sensor 12 whose sensor information is “normal” and coincides, so that the pressure sensor 12 determined to be abnormal is excluded from the abnormality detection target Therefore, appropriate abnormality detection can be performed.

  Furthermore, even if one of the EEPROM 28 of the ECU 20 or the EEPROM 14 of the injector 10 fails, it is determined whether the pressure sensor 12 is normal or abnormal based on the sensor information stored in the other EEPROM that has not failed. it can.

[Second Embodiment]
In the second embodiment, in addition to detecting an abnormality in the pressure sensor 12, an abnormality in the fuel temperature in each injector 10 is detected. The configuration of the fuel injection control system of the second embodiment is substantially the same as that of the first embodiment.

  A fuel temperature abnormality process and fuel temperature information processing in the second embodiment will be described with reference to FIGS. 8 and 9. In the flowcharts of FIGS. 8 and 9, “S” represents a step.

(Processing at abnormal fuel temperature)
The fuel temperature abnormality process in FIG. 8 is executed at the same timing as the sensor abnormality process in FIG. 2 in the injection control process repeatedly executed by the ECU 20.

  ECU20 acquires fuel temperature from the fuel temperature characteristic which shows the relationship between the output voltage of the pressure sensor 12 installed in the injector 10, and fuel temperature. If the fuel temperature characteristic of the pressure sensor 12 deviates greatly from the initial characteristic due to changes over time, the fuel temperature acquired from the output voltage may become abnormal.

  In the fuel temperature abnormality determination in S430, the ECU 20 is a pressure sensor installed in the injector 10 that includes the determination target injector 10 and that is determined to have a normal fuel temperature at a predetermined timing before the determination target injector 10 injects fuel. The fuel temperature is acquired based on the 12 output voltages.

  Then, with respect to the acquired fuel temperature, a fuel temperature deviation between the fuel temperature in the injector 10 that is the next determination target and the average fuel temperature in the other injectors 10 (hereinafter referred to as “fuel temperature deviation”). Comparing the fuel temperature by calculating. When the fuel temperature deviation exceeds a predetermined allowable range, the ECU 20 determines that the fuel temperature in the determination target injector 10 is abnormal.

  The EEPROM 28 of the ECU 20 and the EEPROM 14 of the injector 10 store first fuel temperature information and second fuel temperature information as fuel temperature information indicating whether the fuel temperature in each injector 10 is normal or abnormal. Yes. In the initial state, the fuel temperature information of the EEPROMs 14 and 28 is set to “0” indicating normality.

  In S430, the injector 10 to be detected by the ECU 20 is the injector 10 in which the fuel temperature information stored in the EEPROM 14 and the EEPROM 28 matches "normal". The injector 10 whose fuel temperature information matches with “abnormal” is excluded from the target of abnormality detection.

  When the fuel temperature in the determination target injector 10 is abnormal (S430: Yes), the ECU 20 sets the fuel temperature information corresponding to the injector 10 having an abnormal fuel temperature to “1” indicating abnormality in the EEPROMs 14 and 28. (S432). The timing at which the ECU 20 sets the fuel temperature information to “abnormal” in the EEPROMs 14 and 28 is the same as the timing at which the sensor information is abnormally set in the EEPROMs 14 and 28 in the sensor abnormality processing of FIG.

  Note that the ECU 20 may store the fuel temperature deviation at that time in at least the EEPROM 28 of the EEPROMs 14 and 28 for the injector 10 in which the fuel temperature is determined to be abnormal in S430. The ECU 20 may detect the fuel temperature by correcting the fuel temperature characteristic deviated from the initial characteristic based on the fuel temperature deviation stored in the EEPROM 28.

(Fuel temperature information processing)
The fuel temperature information processing of FIG. 9 is executed when the ignition switch is turned on.
When the ignition switch is turned on, the ECU 20 reads the fuel temperature information for each cylinder from the EEPROM 14 of the injector 10 and the EEPROM 28 of the ECU 20 (S440), and determines whether the fuel temperature information of each cylinder is the same for all the cylinders. Determination is made (S442).

  When the fuel temperature information is the same for all cylinders (S442: Yes), the ECU 20 shifts the process to S452. In S452, the ECU 20 excludes the injectors 10 of the cylinders in which the fuel temperature information in the EEPROM 14 and the EEPROM 28 coincides with “abnormal” from the target of abnormality detection of the fuel temperature, and performs subsequent abnormality detection.

  When there is a cylinder in which the fuel temperature information does not match between the EEPROM 14 and the EEPROM 28 (S442: No), the ECU 20 stores the injector 10 in which the fuel temperature information does not match and the normality or abnormality is not determined in the EEPROM 28 of the ECU20. It is determined whether the first fuel temperature information is “abnormal” (S444).

  When the first fuel temperature information is “abnormal” (S444: Yes), the ECU 20 is stored in the EEPROM 14 of the injector 10 while the first fuel temperature information stored in the EEPROM 28 of the ECU 20 is “abnormal”. Since the second fuel temperature information is “normal”, it is determined that the injector 10 may be replaced, and the process proceeds to S446.

  When the first fuel temperature information is “normal” (S444: No), the ECU 20 is stored in the EEPROM 14 of the injector 10 while the first fuel temperature information stored in the EEPROM 28 of the ECU 20 is “normal”. Since the second fuel temperature information is “abnormal”, it is determined that the ECU 20 is replaced and the first fuel temperature information stored in the EEPROM 28 has become the initial value “normal”, and the process proceeds to S456. . In this case, the fuel temperature of the corresponding injector 10 is abnormal.

  In S <b> 446, the ECU 20 calculates a fuel temperature deviation between the fuel temperature in another injector 10 whose fuel temperature information is “normal” and coincides with the fuel temperature in the injector 10 whose normality or abnormality is undetermined. The fuel temperature for calculating the fuel temperature deviation at this time is acquired at a timing immediately before the injector 10 whose normality or abnormality is undetermined injects fuel.

  When the fuel temperature deviation calculated in S446 exceeds a predetermined allowable range (S448: Yes), the ECU 20 determines that the fuel temperature in the injector 10 in which normality or abnormality is undetermined is abnormal. The second fuel temperature information stored in the EEPROM 14 is set to “abnormal” (S450). Then, the ECU 20 executes the process of S452 described above.

  If the fuel temperature deviation calculated in S446 is within a predetermined allowable range (S448: No), the ECU 20 determines that the fuel temperature in the injector 10 in which normality or abnormality has not been determined is normal, and stores it in the EEPROM 28 of the ECU20. The stored first fuel temperature information is set to “normal” (S454), and the process of S452 described above is executed.

  In S456, the ECU 20 sets the first fuel temperature information stored in the EEPROM 28 of the ECU 20 to “abnormal” in accordance with the second fuel temperature information stored in the EEPROM 14 of the injector 10, and the process of S452 described above is performed. Execute.

  In the second embodiment described above, fuel temperature information can be held in each injector 10 and ECU 20 even when the battery is replaced. Therefore, the abnormality detection of the fuel temperature in the injector 10 can be appropriately performed based on the fuel temperature information stored in each injector 10 and the ECU 20.

  Further, even if the ECU 20 or the injector 10 is replaced between trips after the abnormality of the fuel temperature is detected and the fuel temperature information in the EEPROMs 14 and 28 is set abnormally, the trip in which the ignition switch is turned on. At the start of the operation, the fuel temperature information is read from the EEPROMs 14 and 28, and the abnormality detection is performed for the fuel temperature in the injector 10 in which the fuel temperature information is "normal" and coincides. Appropriate abnormality detection can be performed by excluding the target.

  Furthermore, even if one of the EEPROM 28 of the ECU 20 or the EEPROM 14 of the injector 10 fails, the fuel temperature in the injector 10 is normal or abnormal based on the fuel temperature information stored in the other EEPROM that has not failed. Can be determined.

[Other Embodiments]
In the above-described embodiment, the output voltage of the pressure sensor 12 is used as the pressure detection value used when determining the abnormality of the pressure sensor 12. On the other hand, the fuel pressure acquired from the initial characteristic of the pressure characteristic based on the output voltage may be used as the pressure detection value.

  Moreover, in the said embodiment, the fuel temperature acquired from a fuel temperature characteristic based on the output voltage of the pressure sensor 12 was used as a fuel temperature detection value used when performing abnormality determination of fuel temperature. On the other hand, a physical quantity related to the fuel temperature may be acquired based on the output voltage, and this physical quantity may be used as the detected fuel temperature value.

  As described above, the present invention is not limited to the above-described embodiment, and can be applied to various embodiments without departing from the gist thereof.

10: injector, 12: pressure sensor, 14: EEPROM (second non-volatile memory), 20: ECU (electronic control device, abnormality determination means, information setting means, information determination means, deviation determination means), 28: EEPROM (first 1 non-volatile memory)

Claims (6)

  1. An electronic control device (20) for detecting an abnormality of a pressure sensor (12) installed in the injector to detect fuel pressure in an injector (10) installed in each of a plurality of cylinders,
    A rewritable first nonvolatile memory (28) in which first sensor information indicating whether each of the pressure sensors is normal or abnormal is stored;
    The first sensor information stored in the first non-volatile memory and the injector are provided for a pressure detection value representing either an output value of the pressure sensor or a fuel pressure acquired based on the output value. The pressure sensor to be determined is set to normal in the second sensor information stored in the rewritable second nonvolatile memory (14) and indicating whether the pressure sensor is normal or abnormal. By comparing the pressure detection values detected respectively with the pressure detection values detected by the other pressure sensors for which normality is set in the first sensor information and the second sensor information , An abnormality determination means (S400) for performing a first sensor abnormality determination as to whether the pressure sensor is normal or abnormal;
    When the pressure sensor of the determination target by the first sensor abnormality determination is determined the abnormality determining means is abnormal, abnormal wherein the first sensor information corresponding to the pressure sensor set abnormally, anomalous said pressure Information setting means (S402) for abnormally setting the second sensor information stored in the second nonvolatile memory of the injector in which the sensor is installed;
    When the ignition switch is turned on, for each cylinder , the first sensor information stored in the first nonvolatile memory and the second sensor information stored in the second nonvolatile memory, respectively. Based on whether normal or abnormal is set, the first sensor information and the second sensor information are normal or abnormal, or they do not match, and the pressure sensor is normal or Information determination means (S410, S412) for determining whether the abnormality is indeterminate or not ,
    With
    When the ignition switch is turned on, the abnormality determination means determines that the pressure sensor is normal when the information determination means determines that the first sensor information and the second sensor information are normal and coincident with each other. Determining, and performing a second sensor abnormality determination that determines that the information sensor determines that the first sensor information and the second sensor information coincide with each other abnormally.
    An electronic control device characterized by that.
  2. When the ignition switch is turned on, the first sensor information indicates an abnormality with respect to the pressure sensor in which the first sensor information and the second sensor information do not match and the normality or abnormality is undetermined. If the information determination means (S414) determines that the first sensor information and the second sensor information are normal and coincident with each other, the detected pressure value of the other pressure sensor is normal or abnormal. Deviation determining means (S416, S418) for determining whether or not a detected value deviation of the pressure sensor from the pressure sensor that has not been determined is within a predetermined range;
    When the deviation determination unit determines that the detected value deviation is within the predetermined range, the information setting unit (S424) determines whether the abnormality determination unit is normal or abnormal before the abnormality determination unit performs the second sensor abnormality determination. Normally setting the first sensor information of the first non-volatile memory for the indeterminate pressure sensor;
    The electronic control device according to claim 1.
  3. When the ignition switch is turned on, the first sensor information indicates an abnormality with respect to the pressure sensor in which the first sensor information and the second sensor information do not match and the normality or abnormality is undetermined. If the information determination means (S414) determines that the first sensor information and the second sensor information are normal and coincident with each other, the detected pressure value of the other pressure sensor is normal or abnormal. Deviation determining means (S416, S418) for determining whether or not a detected value deviation of the pressure sensor from the pressure sensor that has not been determined is within a predetermined range;
    When the deviation determination unit determines that the detected value deviation exceeds the predetermined range, the information setting unit (S420) determines whether the abnormality determination unit is normal or abnormal before the abnormality determination unit performs the second sensor abnormality determination. Set the second sensor information of the second non-volatile memory to be abnormal for the pressure sensor that has not been determined,
    The electronic control device according to claim 1, wherein the electronic control device is an electronic control device.
  4. When the ignition switch is turned on, the second sensor information indicates an abnormality with respect to the pressure sensor in which the first sensor information and the second sensor information do not match and normality or abnormality is undetermined. If the information determination means (S414) determines that the pressure sensor is in the normal state, the information setting means (S426) determines whether the normality or abnormality is undecided before the abnormality determination means performs the second sensor abnormality determination. The first sensor information of the first non-volatile memory is set abnormally
    The electronic control device according to any one of claims 1 to 3, wherein
  5. The information setting means further includes that the fuel pressure detected by the pressure sensor determined as abnormal by the abnormality determination means at the time of abnormality determination, and the first sensor information and the second sensor information match normally. In order to correct the fuel pressure detected by the abnormal pressure sensor, the first non-volatile memory and the second non-volatile memory may correct a pressure deviation from the fuel pressure detected by the other pressure sensor when the abnormality is determined. 5. The electronic control device according to claim 1, wherein the electronic control device is stored in at least the first nonvolatile memory of the nonvolatile memories.
  6. The first nonvolatile memory further stores first fuel temperature information indicating whether the fuel temperature detected based on the output value of each of the pressure sensors is normal or abnormal, and the second nonvolatile memory The memory further stores second fuel temperature information indicating whether the fuel temperature detected based on each output value of the pressure sensor is normal or abnormal,
    For the fuel temperature detection value representing either the fuel temperature or a physical quantity related to the fuel temperature and acquired based on the output value, the abnormality determination means (S430) further includes the first nonvolatile memory. The fuel temperature detected by each of the pressure sensors to be determined for which the normality is set in the first fuel temperature information stored in the second non-volatile memory and the second fuel temperature information stored in the second nonvolatile memory By comparing the detection value with the fuel temperature detection value detected by the other pressure sensor for which normality is set in the first fuel temperature information and the second fuel temperature information, the pressure to be determined A fuel temperature abnormality determination is performed as to whether the fuel temperature detected based on the output value of the sensor is normal or abnormal,
    The information setting means (S432), when the abnormality determination means determines that the fuel temperature detected based on the output value is abnormal, the first fuel temperature corresponding to the injector having the abnormal fuel temperature. Information and the second fuel temperature information are set abnormally,
    The information determination means (S440, S442) is configured to store the first fuel temperature information and the second nonvolatile memory stored in the first nonvolatile memory for each cylinder when the ignition switch is turned on. The first fuel temperature information and the second fuel temperature information are normal or abnormal based on whether the second fuel temperature information stored in the memory is set to normal or abnormal. Determine whether or not
    When the ignition switch is turned on, the abnormality determination means further determines that the information determination means determines that the first fuel temperature information and the second fuel temperature information are normal and coincident with each other. The information determination means determines that the fuel temperature detected based on the output value of the sensor is normal and that the first fuel temperature information and the second fuel temperature information are abnormal and coincide with each other. Determining the fuel temperature detected based on the output value of the pressure sensor as abnormal ,
    The electronic control device according to claim 1 , wherein the electronic control device is an electronic control device.
JP2012284580A 2012-12-27 2012-12-27 Electronic control unit Active JP5958329B2 (en)

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JP4380071B2 (en) * 2001-03-01 2009-12-09 株式会社デンソー Fuel injection system
JP3966130B2 (en) * 2001-11-22 2007-08-29 株式会社デンソー Accumulated fuel injection system
JP2008057413A (en) * 2006-08-31 2008-03-13 Hitachi Ltd Method and device for storing characteristics of vehicle
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