JP5840532B2 - Fuel injection control system - Google Patents

Description

  The present invention relates to an engine fuel injection control system, and more particularly to an engine fuel injection control system including a fuel injection valve having a built-in pressure sensor and a communication function.

  2. Description of the Related Art Conventionally, a fuel injection valve for an engine mounted on a vehicle has been known that incorporates a pressure sensor and a communication driver. In such a fuel injection valve, a sensor output signal from a pressure sensor can be transmitted to an electronic control unit (ECU) that performs engine fuel injection control, and communication data can be exchanged with the ECU through a communication driver. It is. Specifically, it is possible to detect the pressure of the fuel with a pressure sensor built in the fuel injection valve and calculate the injection start timing and the injection amount based on the change in the pressure of the fuel caused by the fuel injection. In addition, by installing a memory in the fuel injection valve and storing the characteristic value for each fuel injection valve in the memory at the time of product shipment, the ECU sets the characteristic value of each fuel injection valve after product shipment. This makes it possible to realize control in consideration of individual differences of the fuel injection valves.

  In a system in which communication between the fuel injection valve and the ECU is possible, when a plurality of fuel injection valves are provided, as a method of connecting each fuel injection valve to the ECU in a communicable manner, for example, (1) Fuel A method in which each sensor provided in the injection valve is connected to the ECU through an individual sensor output line, and each communication driver is connected to the ECU through an individual communication line, (2) provided in the fuel injection valve Examples include a method in which each sensor is connected to the ECU via an individual sensor output line, and each communication driver is connected to the ECU via a common communication line. Of these, the latter can reduce the number of communication lines and ports as much as possible, and is excellent in terms of simplification of the system.

  On the other hand, when the latter connection method (the connection method (2) above) is adopted, the communication data transmitted from the ECU is received by the communication devices of all the fuel injection valves. Therefore, for communication data destined for a specific fuel injection valve, by including the node ID in the communication data, when the fuel injection valve receives the communication data, is the communication data addressed to its own device? It becomes possible to identify whether it is not.

  As for the node ID, for example, at the time of product shipment, a node ID is assigned to each fuel injection valve in advance, and the correspondence between the node ID and the fuel injection valve is stored in the ECU in advance, so that the node ID can be used as a base. Communication between the ECU and the fuel injection valve can be performed. However, if the installation position of the fuel injection valve is wrong, for example, a fuel injection valve that should be attached to the first cylinder is attached to the second cylinder, or the fuel injection valve is replaced after shipment of the product. The correspondence relationship between the fuel injection valve and the node ID is different from that previously stored in the ECU.

  Therefore, a plurality of fuel injection valves each including a pressure sensor and a communication device are provided, and each pressure sensor is connected to the ECU via an individual sensor output line, and each communication driver is connected to the ECU via a common communication line. In an existing system, it is proposed to perform the ID setting process in a state where the connection between the ECU and the fuel injection valve is completed (see, for example, Patent Document 1). The system described in Patent Document 1 is provided with a switching circuit that switches the sensor output line to a specific state (voltage 0 V) based on a signal from the ECU. In addition, the ECU controls the drive of the switching circuit so that the sensor output line connected to the fuel injector that is not the destination of the ID setting command is in a normal state and is connected to the fuel injector that is the destination of the ID setting command. In a state where the sensor output line is in a specific state, an ID setting command is transmitted from the ECU to the fuel injection valve. Thereby, even if the information regarding the destination is not included in the ID setting command from the ECU, by referring to the voltage of the sensor output line connected to itself, the received ID setting command is It is possible to determine whether or not it is the destination.

JP 2012-2212 A

  By the way, in the above system, when an abnormality occurs in the circuit connecting the pressure sensor and the ECU, the sensor output line may not be switched between the normal state and the specific state even if the switching circuit is driven. In such a case, at the time of transmission of the ID setting command, the sensor output line connected to the fuel injector that is the destination of the ID setting command is not in a specific state, or the sensor output line that is connected to the fuel injector that is not the destination is It may become a specific state. In addition, when a unique node ID cannot be assigned to each fuel injection valve due to such an event, or when an abnormality occurs in the circuit connecting the pressure sensor and the ECU, the switching circuit is driven. There is a risk of further failure of the circuit.

  The present invention has been made to solve the above-described problem, and a main object of the present invention is to provide an engine fuel injection control system capable of performing appropriate control even when an abnormality occurs in a circuit. .

  The present invention employs the following means in order to solve the above problems.

  The present invention relates to a fuel injection control system including a plurality of fuel injection valves and an electronic control unit that controls fuel injection of an engine by controlling driving of the plurality of fuel injection valves. Further, in the first aspect of the present invention, each of the plurality of fuel injection valves receives a communication data from the electronic control unit and a sensor unit that detects a fuel injection parameter of the engine and outputs a signal thereof. And a processing unit that executes processing based on communication data received by the communication unit, and the electronic control unit outputs individual sensor outputs to each of the sensor units with respect to the plurality of fuel injection valves. A voltage switching unit that is connected through a line and is connected to each of the communication units through a common communication line, controlled by the electronic control unit, and configured to switch the voltage of the sensor output line to a predetermined voltage; and the voltage switching unit By switching the voltage according to the above, destination information regarding the destination of the communication data is given to each of the plurality of fuel injection valves through the sensor output line. A transmission control unit that transmits the communication data from the electronic control unit to the communication unit through the communication line in a state in which the destination information is added by the information granting unit or in a state in which the granting is completed. When the communication data transmitted by the transmission control means is received by the communication unit, in each processing unit of the plurality of fuel injection valves, whether to perform processing based on the communication data based on the destination information A reception control means for determining whether or not there is an abnormality by means of an abnormality diagnosis means for diagnosing a circuit abnormality based on the voltage of the sensor output line before the destination information is given by the information giving means; When diagnosed, the information adding unit prohibits the addition of destination information, and when the abnormality diagnosing unit diagnoses that there is no abnormality, the information adding unit A permission determination means for permitting the application of previous information, that includes the features.

  In short, a plurality of fuel injection valves each having a sensor unit and a communication unit are provided, and the sensor unit of the fuel injection valve and the electronic control unit are connected to each fuel injection valve by a separate sensor output line. And the electronic control unit are connected by a common communication line in all the fuel injection valves, the destination information is included in the communication data transmitted to the fuel injection valve, so that the fuel injection valve Is the destination of the communication data. Further, in this configuration, at the time of transmission of communication data or before transmission, the voltage of the sensor output line is switched to a predetermined voltage by the voltage switching means, and destination information is given to each fuel injection valve through the sensor output line, thereby Even if the destination information is not included in the communication data transmitted to the injection valve, by referring to the destination information given through the sensor output line in the fuel injection valve, the destination is the destination of the communication data. It can be determined whether or not there is.

  Here, when the destination information is given to the fuel injection valve through the sensor output line, if a circuit abnormality occurs in the path connecting the sensor unit and the electronic control unit, the sensor output line can be controlled even if the voltage switching means is controlled. The voltage may not change. In such a case, it is not possible to properly specify the destination of the communication data through the sensor output line, and processing based on the communication data is executed by the fuel injection valve that is not originally the destination of the communication data, or the destination of the communication data There is a possibility that the process based on the communication data may not be executed by the fuel injection valve. In particular, when a short-circuit abnormality occurs in the sensor output line (for example, when a power supply short-circuit occurs), the operation of switching the voltage of the sensor output line is performed by controlling the voltage switching means, so that the circuit including the sensor output line is greatly increased. It is thought that current may flow and cause further failure of the circuit.

  In this regard, according to the present invention, an abnormality is diagnosed based on the voltage of the sensor output line, and when it is diagnosed that there is an abnormality, the operation of switching the voltage of the sensor output line by the voltage switching means is not performed. Therefore, in the case where an abnormality has occurred in the path connecting the sensor unit and the electronic control device, inconvenience due to the voltage switching operation of the sensor output line by the voltage switching means, specifically, the further failure of the circuit Inconveniences such as inconvenience, and wasteful processing by the voltage switching means even when the destination of the communication data cannot be specified can be avoided.

The block diagram showing the whole fuel injection control system outline of an engine. The figure showing the detailed structure of an injector and ECU. The time chart which shows the specific aspect of ID setting processing of 1st Embodiment. The flowchart which shows the process sequence of ID provision process. The flowchart which shows the process sequence of an abnormality diagnosis process. The flowchart which shows the process sequence of ID reception process. The time chart which shows the mode at the time of the time of the normal of the voltage of a sensor output line, and abnormality. The time chart which shows the specific aspect of ID setting processing of 2nd Embodiment.

(First embodiment)
The first embodiment will be described below with reference to the drawings. In the present embodiment, a fuel injection control system that controls an injector of an engine is constructed. The system controls the drive of the injector with an electronic control unit (hereinafter referred to as ECU) as the center, thereby implementing fuel injection control of the engine. An overall schematic diagram of the circuit configuration of this system is shown in FIG.

  The control system shown in FIG. 1 is mounted on a vehicle equipped with a multi-cylinder engine (four-cylinder engine in this embodiment), and controls the injector 10 provided for each cylinder of the engine and the drive of the injector 10. A drive control unit (EDU) 30 for controlling the engine, and an ECU 50 for performing fuel injection control of the engine.

  The injector 10 is an in-cylinder fuel injection valve that directly supplies fuel into each cylinder of the engine. The injector 10 of this embodiment includes a pressure sensor 11 as a sensor unit that detects the fuel injection pressure of the injector 10, a memory 13 as a storage unit that stores and holds data, and a communication unit that can transmit and receive communication data. A communication driver 15 and a communication processing unit 17 that executes various processes based on communication data are provided.

  The pressure sensor 11 is provided, for example, near the nozzle hole at the tip of the injector 10 and detects the fuel pressure in the nozzle hole as a fuel injection parameter of the engine. The pressure sensor 11 includes a sensor element 11 a and an output circuit 12. The output circuit 12 is electrically connected to the sensor element 11a and the sensor output line LS. The output circuit 12 receives an output signal of the sensor element 11a, which is a sensor output signal representing a pressure measurement result, and the input sensor output signal. Is output to the sensor output line LS. In the present embodiment, each pressure sensor 11 of the plurality of injectors 10 and the ECU 50 are connected via individual sensor output lines LS.

  As shown in FIG. 2, the output circuit 12 includes an operational amplifier 12a and resistors R1, R2, and R3. The output terminal of the operational amplifier 12a is connected to its negative terminal, and the output terminal of the sensor element 11a is used as a positive terminal. A buffer circuit is configured by connection. In this output circuit 12, the output voltage Vout of the output circuit is reduced to 0V <0 by a resistor R1 to which the power supply voltage Vc = 5V is supplied, a grounded resistor R3, and a resistor R2 connecting the resistor R1 and the resistor R3. The range is Vout <5V (for example, a range of 0.8V ≦ Vout ≦ 4.8V).

  The memory 13 is a nonvolatile memory in which data can be electrically rewritten. In the present embodiment, the memory 13 is composed of, for example, EEPROM (registered trademark). The memory 13 may be composed of a volatile memory such as an SRAM. The memory 13 stores sensor characteristic values, injector characteristic values, individual numbers, and the like as unique information of each injector 10.

  The communication driver 15 is electrically connected to the communication processing unit 17 and can exchange data with the communication processing unit 17. The communication driver 15 is electrically connected to the ECU 50 through the communication line LC, receives the communication data transmitted from the ECU 50 and outputs the communication data to the communication processing unit 17, and the communication data input from the communication processing unit 17 It transmits to ECU50 through the communication line LC. Thereby, communication between the injector 10 and the ECU 50 is realized. The communication line LC is shared by each injector 10, and the communication driver 15 and ECU 50 of each injector 10 are connected (bus connected) by a common communication line LC.

  As is well known, the communication processing unit 17 is configured mainly with a microcomputer including a CPU, ROM, RAM, and the like, and executes various processes based on communication data received from the ECU 50 through the communication driver 15. For example, when the communication processing unit 17 receives a command signal for transmitting the injector characteristic value from the ECU 50 as the communication data, the communication processing unit 17 reads the injector characteristic value stored in the memory 13 based on the command signal and reads the read characteristic value. The injector characteristic value is transmitted to the ECU 50 through the communication line LC as response data for the received communication data. Alternatively, when the communication processing unit 17 receives a command signal for updating the injector characteristic value from the ECU 50 as communication data, the communication processing unit 17 writes a learning value for the injector characteristic value included in the command signal in the memory 13. The processing for updating the injector characteristic value stored in the is executed.

  In this system, exchange of communication data between the injector 10 and the ECU 50 is performed through a communication line LC common to each injector 10, whereas it is output from a pressure sensor 11 attached to each injector 10. Transmission of the sensor output signal is performed in a separate system from the communication line LC through the sensor output line LS provided individually for each injector 10.

  The ECU 50 executes a communication driver 51 connected to the communication driver 15 on each injector 10 side through the communication line LC, an input circuit 55 connected to each sensor output line LS, and various processes for fuel injection control. And a microcomputer 53 (hereinafter referred to as a microcomputer). The microcomputer 53 is electrically connected to the communication driver 51 and the input circuit 55, respectively, and inputs communication data such as unique information of the injector 10 through the communication driver 51, and from the pressure sensor 11 through the input circuit 55. Input sensor output signal. Further, the microcomputer 53 calculates the fuel injection timing, the injection amount, and the like based on the inputted various data, and outputs an injection signal (injector drive signal) based on the calculation result to the EDU 30. The EDU 30 controls the drive of each injector 10 based on the injection signal input from the microcomputer 53 of the ECU 50.

  As shown in FIG. 2, the microcomputer 53 stores a plurality of (four in this embodiment) A / D converters 53a connected to each input circuit 55 and data at the output end of the input circuit 55. And a memory 53b as a storage unit. The A / D converter 53a converts the analog sensor output signal output from the input circuit 55 into a digital signal. This digital signal is used for various fuel injection controls executed by the microcomputer 53. For example, the measured value (sensor output value) indicated by the sensor output signal of each pressure sensor 11 is corrected based on the sensor characteristic value for each injector 10 read from the injector 10 through the communication line LC, and the corrected value is the fuel value. Used for injection control. In FIG. 2, only one A / D converter 53a is shown, and the other A / D converters 53a are omitted.

  The memory 53b only needs to be able to store and hold data, and may be a volatile memory or a nonvolatile memory. In the present embodiment, an SRAM is used as the memory 53b, and data is stored and held while the connection state with the power source is maintained, and data is lost by being disconnected from the power source. The memory 53b stores sensor characteristic values, injector characteristic values, individual numbers of the injectors 10 and the like as unique information of the injectors 10 read from the injectors 10 through the communication line LC.

  In this system, the communication driver 15 provided on each injector 10 side and the communication driver 51 provided on the ECU 50 side are connected by a common communication line LC. Therefore, when communication data is transmitted from the ECU 50 to the injector 10, the communication data is received by all the injectors 10. However, in the communication data, there is data that should have a part of the plurality of injectors 10 as a destination. Therefore, in the present system, the communication data exchanged between the injector 10 and the ECU 50 includes the node ID as the identification information in the communication data 17 between the injector 10 and the ECU 50. It is possible to identify whether or not the communication data received from is addressed to its own device. Further, when the ECU 50 receives communication data from the injector 10, the ECU 50 can identify which injector 10 has transmitted the communication data.

  In this system, an ID setting process for setting the node ID of each injector 10 is executed. In particular, in this embodiment, the ID setting process is executed in a state where the electrical connection between the plurality of injectors 10 and the ECU 50 is completed. It is said.

  Hereinafter, the ID setting process of this embodiment will be described in detail. The ID setting process of the present embodiment is an ID assigning process that is a process for assigning a node ID to the injector 10 and an ID that is a process for recognizing the assigned node ID and setting it as its own node ID on the injector 10 side. And reception processing. Among these, the ID assigning process is executed by the microcomputer 53 of the ECU 50, and the ID setting process is executed by the microcomputer of the communication processing unit 17 of the injector 10.

  In the ID setting process, an ID setting process is first executed to transmit an ID setting command as communication data from the ECU 50 to the injector 10 through the communication line LC. The ID setting command includes one node ID among node IDs (four node IDs in the present embodiment) assigned to each injector 10, and requests the injector 10 to set the node ID as its own node ID. Communication data. However, at the time when the ID setting command is transmitted, the injector 10 cannot determine whether the received ID setting command is addressed to the own apparatus or not.

  Thus, in this system, when the ID setting command is transmitted, the voltage of each sensor output line LS is switched to a predetermined voltage, so that each of the plurality of injectors 10 can receive destination information regarding the destination of communication data through the sensor output line LS. (Information providing means). Further, the microcomputer 53 transmits an ID setting command as communication data to the injector 10 in a state where the destination information is given (transmission control means). On the injector 10 side, by referring to the destination information given through the sensor output line LS, it is determined whether or not to execute processing based on the received ID setting command (reception control means). Therefore, even if the node ID is not included in the communication data transmitted to the injector 10, the injector 10 refers to the destination information given through its own sensor output line LS so that the communication data ( It can be determined whether or not it is a destination of (ID setting instruction).

  More specifically, in the present embodiment, in this system, the ECU 50 is provided with a transistor Tr11 as voltage switching means for switching the voltage of the sensor output line LS connected to each injector 10 to a predetermined voltage. The injector 10 is provided with a voltage detection circuit 19 as voltage detection means for detecting the voltage of the sensor output line LS connected to the injector 10. When transmitting the ID setting command, the microcomputer 53 of the ECU 50 first sets the sensor output line LS (non-target output line) connected to the injector 10 that is not the destination of the ID setting command to the first voltage by the on / off control of the transistor Tr11. On the other hand, the sensor output line LS (target output line) connected to the injector 10 that is the destination of the ID setting command is set to a second voltage state different from the first voltage state. Thereby, destination information is provided to the injector 10 side through the sensor output line LS (information providing means). The ECU 50 transmits an ID setting command from the ECU 50 to the injector 10 with the non-target output line in the first voltage state and the target output line in the second voltage state (transmission control means). In each injector 10, the voltage detection circuit 19 detects the voltage of the sensor output line LS, thereby determining whether the sensor output line LS connected to itself is in the first voltage state or the second voltage state. When the sensor output line LS connected to itself is in the first voltage state, the received ID setting command is discarded. On the other hand, when the sensor output line LS connected to itself is in the second voltage state, processing based on the received ID setting command is executed (reception control means).

  The transistor Tr11 as voltage switching means is provided in the input circuit 55 as shown in FIG. 2, and is configured as an NPN transistor Tr11 in this embodiment. For each terminal of the transistor Tr11, the base terminal is connected to a trigger terminal provided for each input circuit 55 in the microcomputer 53, the emitter terminal is grounded, the collector terminal is connected to the sensor output line LS, and the resistor R12. Is connected to a power supply voltage Vc (for example, Vc = 5 V).

  The transistor Tr11 is turned on and off by a command signal from the microcomputer 53 through the trigger terminal, and thereby the voltage state of the sensor output line LS is changed. Specifically, when the base potential of the transistor Tr11 is set to Lo by the microcomputer 53, the transistor Tr11 is turned off. In this case, the sensor output line LS is in a normal state (> 0V, the second state in which the sensor output signal can be transmitted). 1 voltage state). On the other hand, when the base potential of the transistor Tr11 is set to Hi, the transistor Tr11 is turned on and the sensor output line LS is grounded. Therefore, the voltage of the sensor output line LS becomes 0 V, and a specific state (second voltage state) in which the sensor output signal cannot be transmitted is entered.

  The input circuit 55 includes a filter circuit including a capacitor C11 and a resistor R11 in addition to the transistor Tr11 and the resistor R12. Thereby, the sensor output signal transmitted through the sensor output line LS is input to the A / D converter 53a through the filter circuit.

  The voltage detection circuit 19 detects the voltage of the sensor output line LS based on the output voltage Vout of the pressure sensor 11. Specifically, the voltage detection circuit 19 includes a comparator, and the output voltage Vout and the threshold voltage of the pressure sensor 11 are input to the comparator, and the comparison result is output to the communication processing unit 17 as output data of the comparator. At this time, when the output voltage Vout of the pressure sensor 11 is higher than the threshold voltage, a Hi signal is input from the comparator to the communication processing unit 17, and when the output voltage Vout of the pressure sensor 11 is lower than the threshold voltage, The Lo signal is input from the comparator to the communication processing unit 17. If the signal input from the voltage detection circuit 19 is Hi, the communication processing unit 17 determines that the sensor output line LS is in a normal state (> 0 V) in which the sensor output signal can be transmitted. It is determined that the sensor output line LS is in a specific state (= 0 V) where the sensor output signal cannot be transmitted.

  In this embodiment, the voltage at the output terminal of the output circuit 12 is input to the voltage detection circuit 19 as the output voltage Vout. However, the voltage between the input terminal and the output terminal of the output circuit 12 is the output voltage. A configuration may be adopted in which the voltage detection circuit 19 is input as Vout.

  Next, the ID setting process of the present embodiment will be specifically described with reference to the time chart of FIG. In the present embodiment, the first cylinder injector (injector # 1), the second cylinder injector (injector # 2), the third cylinder injector (injector # 3), and the fourth cylinder injector (injector # 4). Node IDs are set in this order. However, in FIG. 3, for convenience, ID setting of the injector # 1 and the injector # 2 is shown. In the present embodiment, this ID setting process is executed every time the ECU 50 is activated in accordance with switching of the ignition switch of the vehicle. However, it is good also as a structure performed according to the input of the execution command from the outside.

  In FIG. 3, when the ECU 50 is activated, the sensor output voltage Vout shows a value corresponding to the pressure detection result of the sensor element 11a. The microcomputer 53 of the ECU 50 selects the injector # 1 as the current ID setting target injector 10 at the timing t10, and the transistor Tr11 of the voltage switching circuit 55a connected to the sensor output line LS (LS # 1) of the injector # 1. (Tr # 1) is switched from OFF to ON. As the transistor Tr # 1 is turned on, the voltage of the sensor output line LS # 1 is switched to 0V.

  At subsequent timing t11, the microcomputer 53 transmits an ID setting command as communication data from the communication driver 51 of the ECU 50 to the communication driver 15 of the injector 10 through the communication line LC. The ID setting command transmitted here includes information indicating that “1” is set as the node ID.

  When an ID setting command from the microcomputer 53 is input to the communication processing unit 17 of each injector 10, each communication processing unit 17 outputs a sensor output connected to its own device based on an input signal from the voltage detection circuit 19. It is determined whether the line LS is in a normal state in which the sensor output signal can be transmitted (larger than the threshold voltage) or in a specific state in which the sensor output signal cannot be transmitted (smaller than the threshold voltage). . And about the injector 10 in which the sensor output line LS is in a normal state, it judges that itself is not an ID setting object, and discards the ID setting command received this time. That is, the process for the current ID setting command is not executed. Here, the received ID setting command is discarded in injector # 2, injector # 3, and injector # 4.

  On the other hand, in the injector 10 in which the sensor output line LS is in a specific state, the injector 10 determines that it is the current ID setting target, and executes processing based on the ID setting command received this time (ID reception processing). Here, the ID reception process is executed in the injector # 1, which is the current ID setting target. As the ID reception process, the communication processing unit 17 of the injector # 1 reads its own individual number (individual number # 1) from the memory 13 at timing t12, and transmits the read individual number to the ECU 50 through the communication line LC. At the timing t13, the node ID “1” included in the ID setting command is set as its own node ID and stored in the memory 13.

  When the microcomputer 53 of the ECU 50 receives the individual number of the injector 10, the microcomputer 53 stores and updates the received individual number in the memory 53b as information on the current ID setting target injector 10 (here, the injector of the first cylinder) (timing). t13). Further, the microcomputer 53 switches the transistor Tr # 1 from on to off at timing t14.

  When the ID setting for the injector # 1 is completed, the ID setting for the injector # 2 is next executed. Also in this case, basically, the same processing as in the case of the injector # 1 is executed. That is, the microcomputer 53 of the ECU 50 switches the transistor Tr11 (Tr # 2) connected to the sensor output line (LS # 2) of the injector # 2 from OFF to ON at timing t15, and passes through the communication line LC at timing t16. An ID setting command is transmitted. This ID setting command includes information indicating that “2” is set as the node ID.

  The communication processing unit 17 of each injector 10 determines whether the sensor output line LS connected to its own device is in a normal state or a specific state based on a signal input from the voltage detection circuit 19. Here, since the sensor output line # 2 is in a specific state, the communication processing unit 17 of the injector # 2 executes ID setting processing based on the ID setting command received this time (timing t17 to t18). On the other hand, each communication processing unit 17 of injector # 1, injector # 3, and injector # 4 discards the received ID setting command.

  Incidentally, when a circuit abnormality such as a short circuit or a ground fault occurs in a path (for example, the output circuit 12 or the input circuit 55) connecting the sensor element 11a and the A / D converter 53a, the microcomputer 53 causes the base potential of the transistor Tr11 to be Even if is set to Lo, the sensor output line LS may not be in a normal state (a state where the voltage is higher than 0V). Similarly, when the circuit 53 is abnormal, even if the microcomputer 53 sets the base potential of the transistor Tr11 to Hi, the sensor output line LS may not be in a specific state (voltage is 0V).

  For example, when the sensor output line LS connected to the injector # 1 has a ground fault, the sensor output line # 1 always indicates 0 V. Therefore, on the injector # 1 side, the sensor output line LS # 1 is turned on by turning on the transistor Tr # 1. Is indistinguishable from being grounded. In such a case, the injector # 1 always recognizes itself as an ID setting target based on the voltage of the sensor output line LS # 1, and ID setting is performed every time an ID setting command is transmitted from the ECU 50. The As a result, a unique node ID different from that of the other injectors cannot be assigned to the injector # 1, and there are a plurality of injectors 10 having the same node ID. For example, the node ID “4” of the injector # 4 that finally performed the ID setting is attached to the injector # 1 even though “1” is supposed to be attached as the node ID. In such a case, the injector # 1 is driven and controlled according to the command transmitted to the injector # 4, and the controllability of the fuel injection control may be reduced. Further, when the sensor output line LS is grounded, even if the base potential of the transistor Tr # 1 is set to Hi on the ECU 50 side, it eventually corresponds to the cylinder number in which each injector 10 is installed. The appropriate node ID cannot be set, and the operation of switching the base potential to Hi becomes a useless process.

  Even when the sensor output line LS # 1 connected to the injector # 1 is short-circuited, the sensor output line LS # 1 may not be in a voltage state corresponding to the base potential of the transistor Tr # 1. For this reason, the injector # 1 cannot recognize whether or not it is an ID setting target and cannot assign a node ID to the injector # 1. In particular, when the sensor output line LS is short-circuited with the power supply, with the switching of the transistor Tr # 1 from OFF to ON, current flows from the power supply to the transistor Tr11 using the power supply voltage Vc connected to the resistor R1 as a supply source. There is a risk that a large current exceeding the design value flows in the circuit. In this case, there is a risk of causing an irreversible failure in the circuit.

  Therefore, in the present embodiment, the abnormality of the circuit is diagnosed based on the voltage of the sensor output line, and when the abnormality is diagnosed, the execution of the ID assignment process executed by the microcomputer 53 of the ECU 50 is prohibited. Yes.

  Next, processing procedures of ID setting processing (ID assignment processing, ID reception processing) and abnormality diagnosis processing according to the present embodiment will be described with reference to the flowcharts of FIGS. First, the ID assigning process (FIG. 4) will be described. This process is executed at predetermined intervals by the microcomputer 53 of the ECU 50.

  In FIG. 4, in step S100, it is determined whether or not the process of diagnosing abnormality of the voltage of the sensor output line LS (abnormality diagnosis process) has been executed for all the injectors 10 before executing the ID assigning process. judge. Here, the execution completion flag F1 indicating that the execution of the abnormality diagnosis process is completed is referred to, and an affirmative determination is made when the execution completion flag F1 is on. When the executed flag F1 is off and the abnormality diagnosis by the abnormality diagnosis process is not completed, the process proceeds to step S105, and the abnormality diagnosis process shown in FIG. 5 is executed. The abnormality diagnosis process in FIG. 5 corresponds to “abnormality diagnosis means” in the present invention.

  Here, the abnormality diagnosis process will be described. In FIG. 5, in step S <b> 200, it is determined whether or not abnormality diagnosis processing is being performed in any of the injectors 10 (whether or not sampling is being performed). When step S200 is No, the process proceeds to step S205, and one injector 10 to be diagnosed this time is selected from the injectors 10 for which abnormality diagnosis has not been performed, and the process proceeds to step S210. In step S210, the sampling number Ns and the abnormality detection number Nd are initialized to zero, and when this process is completed, an operation for judging a change in the sensor output voltage with reference to the digital signal converted by the A / D converter 53a is performed. Repeat Nn times the specified number of times (steps S220 to S250).

  Specifically, in step S220, the sampling count Ns is incremented by 1, and in step S230, the digital signal converted by the A / D converter 53a is referred to, and the change amount of the current value of the sensor output voltage from the previous value. Whether or not is smaller than a predetermined value is determined. If the change amount is smaller than the predetermined value and there is almost no change in the sensor output voltage (Yes in step S230), the abnormality detection count Nd is incremented by 1 in step S240, and the process proceeds to step S250. On the other hand, if the change in the sensor output voltage is equal to or greater than the predetermined value (No in step S230), the process proceeds to step S250 without updating the abnormality detection count Nd.

  In step S250, it is determined whether or not the sampling count Ns is equal to or greater than the specified count Nn. If the sampling count Ns is less than the specified count Nn (No in step S250), the routine is temporarily terminated. In this case, this routine is executed again, and the operation of determining the amount of change in the sensor output voltage is repeated until the sampling count Ns reaches the specified count Nn. If it is determined in step S250 that the sampling number Ns is equal to or greater than the specified number Nn, the process proceeds to step S260, and it is determined whether the abnormality detection number Nd exceeds the threshold value.

  If the abnormality detection count Nd exceeds the threshold value (Yes in step S260), the process proceeds to step S270, where it is determined that there is an abnormality in the voltage of the sensor output line LS in the injector 10 currently being diagnosed. Specifically, based on a sensor output signal input to the ECU 50, the sensor output voltage Vout is constant at 0V, constant at a power supply voltage (for example, 5V), or between 0V and the power supply voltage. When the intermediate value is fixed, it is determined that the circuit is abnormal. On the other hand, if the abnormality detection count Nd is less than or equal to the threshold value (No in step S260), the process proceeds to step S280, where it is determined that the abnormality of the voltage of the sensor output line LS does not occur in the injector 10 currently diagnosed. To do.

  In a succeeding step S285, it is determined whether or not the abnormality diagnosis has been completed for all the injectors 10. If not yet completed, this routine is repeated again. When all the abnormality diagnoses are completed, an affirmative determination is made in step S285, the process proceeds to step S290, the executed flag F1 is turned on, and the present process is terminated.

  Returning to the description of FIG. 4, when the abnormality diagnosis is completed for all the injectors 10 by the abnormality diagnosis process of FIG. 5, an affirmative determination is made in step S <b> 100 and the process proceeds to step S <b> 110. In step S110, it is determined whether or not all the injectors 10 have been determined to be normal. And when it determines with all the injectors 10 being normal, execution of the following ID provision processes (process of step S115-S150) is permitted. On the other hand, when it is determined that there is an abnormality in any of the injectors 10, the execution of the following ID assignment process is prohibited, and this process is terminated as it is.

  For details of the ID assigning process, the microcomputer 53 determines whether or not the assignment of the node ID to all the injectors 10 is completed in step S115. When step S115 is No, it progresses to step S120, and the injector 10 of this ID setting object is selected from the injector 10 which ID setting has not finished yet. In subsequent step S125, the base potential of the transistor Tr11 of the input circuit 55 connected to the selected ID setting target injector 10 is switched from Lo to Hi, and the transistor Tr11 is turned on (information providing means). Accordingly, the voltage of the sensor output line LS connected to the ID setting target injector 10 is switched from Hi (> 0 V) to Lo (0 V). Note that, in the transistor Tr11 of each input circuit 55, the base potential in the initial state is all maintained at Lo. Therefore, for the injector 10 that is not the ID setting target this time, the voltage of the sensor output line LS connected to the injector 10 is Hi (> 0 V).

  In subsequent step S130, the microcomputer 53 generates an ID setting command as communication data. The generated ID setting command is transmitted through the communication driver 51 while the transistor Tr11 connected to the ID setting target injector 10 is turned on and the transistors Tr11 connected to the other injectors 10 are turned off. Output to the communication line LC (transmission control means). The ID setting command generated here includes a node ID assigned to the ID setting target injector 10, for example, a node ID corresponding to the cylinder number of the ID setting target injector 10. .

  Thereafter, the microcomputer 53 waits until a predetermined time elapses after transmitting the ID setting command, and receives response data for the ID setting command from the communication processing unit 17 of the injector 10 within the waiting time in step S135. It is determined whether or not. In the present embodiment, when the injector 10 is normal, data indicating its own individual number is transmitted as response data from the injector 10 in response to the ID setting command. When the microcomputer 53 receives the individual number of the injector 10 (Yes in step S135), the microcomputer 53 proceeds to step S140, and updates the management data for the ID setting target injector 10. In the present embodiment, the memory 53b built in the microcomputer 53 holds, as management data for each cylinder, data that associates the node ID assigned to the injector 10 of each cylinder and the individual number of the injector 10. Yes. Here, the individual number of the node ID assigned to the injector 10 this time is updated to the received individual number. Thereafter, the process proceeds to step S150.

  On the other hand, if the predetermined time has passed without receiving the response data (No in step S135), the individual number indicated by the management data of the cylinder corresponding to the ID setting target injector 10 is rewritten to the error code, and the memory After the management data stored in 53b is updated (step S145), the process proceeds to step S150.

  In step S150, the sensor output line LS connected to the ID setting target injector 10 is returned to the normal state. That is, the base potential of the transistor Tr11 of the input circuit 55 connected to the ID output target sensor output line LS is switched from Hi to Lo. In this way, the node ID is assigned to the injector 10 of each cylinder. Then, when node IDs are assigned to all the injectors 10 (Yes in step S115), this process is terminated.

  Next, ID reception processing will be described with reference to FIG. This process is executed at predetermined intervals by the microcomputer of the communication processing unit 17 of each injector 10. 6 corresponds to the “reception control means” in the present invention.

  In FIG. 6, the microcomputer of the communication processing unit 17 determines whether or not communication data is received by the communication driver 15 and the communication data is an ID setting command in step S310. When the ID setting command is received (Yes in Step S310), the process proceeds to Step S320, and the voltage of the sensor output line LS connected to the own device is detected. Here, it is determined whether the input signal from the voltage detection circuit 19 is Hi / Lo. When the input signal from the voltage detection circuit 19 is Hi (when the sensor output line LS is in a normal state), the received ID setting command is discarded, and the process ends without executing the processes of steps S330 and S340. To do. On the other hand, when the input signal from the voltage detection circuit 19 is Lo (when the sensor output line LS is in a specific state), the process proceeds to step S330, and the individual number of the own device is read from the memory 13, and the individual number is set. It transmits to ECU50 through the communication driver 15. In step S340, the node ID included in the ID setting command is stored in the memory 13 as the node ID of the own device. Then, this process ends.

  FIG. 7 is a time chart showing an embodiment of the ID setting process at a normal time when no circuit abnormality occurs and at an abnormal time when a circuit abnormality occurs. In FIG. 7, a case where the sensor output line LS # 1 of the injector # 1 is short-circuited with the power source will be described as an example. In FIG. 7, the normal time is indicated by a one-dot chain line, and the abnormal time is indicated by a solid line. Further, in FIG. 7, for convenience, the injector # 1 and the injector # 2 are shown among the four injectors 10 arranged in each cylinder.

  In FIG. 7, when the ECU 50 is activated, the sensor output voltage Vout indicates a value corresponding to the pressure detection result of the sensor element 11a when it is normal, whereas it indicates the power supply voltage Vc (5V) when a power supply short circuit occurs. In the present embodiment, when it is determined that the sensor output line LS is short-circuited with the power supply based on the sensor output voltage Vout, the base potential of the transistor Tr11 is prohibited from being set to Hi for all the cylinders (transistor Tr11 is not turned on).

  Note that if any of the injectors 10 diagnoses that there is an abnormality in the voltage of the sensor output line LS, in this embodiment, node IDs are not set for all the injectors 10, and the injector characteristic values, sensor characteristic values, and the like are set. Implement engine fuel injection control without consideration. However, when the ID setting process is not performed due to the occurrence of a circuit abnormality, the fuel injection control of the engine may be performed using the previously set node ID.

  According to the embodiment described in detail above, the following excellent effects can be obtained.

  An abnormality is diagnosed based on the voltage of the sensor output line LS. When it is diagnosed that there is no abnormality, the execution of the ID setting process (ID assignment process) is permitted, and when it is diagnosed that there is an abnormality, the ID setting process (ID assignment) Execution of processing) was prohibited. Thus, inconvenience when the transistor Tr11 is turned on when an abnormality in the voltage of the sensor output line LS occurs, specifically, the circuit is greatly increased by turning on the transistor Tr11 when the sensor output line LS is short-circuited. An inconvenience that current flows and a failure that cannot be restored occurs in the circuit, an inconvenience that the controllability of the fuel injection control of the engine is deteriorated due to an inability to properly set the node ID, or an appropriate node ID However, it is possible to avoid the inconvenience of performing a wasteful process of turning on the transistor Tr11 even though it cannot be set.

  Since a certain amount of time is required until the injector 10 receives the ID setting command from the ECU 50, the ID setting command is transmitted with the sensor output line LS in either the normal state or the specific state. In the configuration, the transistor Tr11 must be turned on for at least a period from when the ID setting command is transmitted to when it is received by the injector 10. At this time, if the destination information cannot be transmitted through the sensor output line LS due to an abnormality in the voltage of the sensor output line LS, if the above control is performed, a period for performing useless processing becomes long. In addition, when a short circuit occurs in the sensor output line LS, it can be considered that the time during which current flows in a path that does not flow originally becomes long. Therefore, in the configuration of the present system, the above inconvenience can be suitably suppressed by not performing the ID setting process when the voltage of the sensor output line LS is abnormal.

  When the ID setting command is transmitted, the current value of the node ID is not set. Even if the ID setting command is transmitted to the injector 10, the injector 10 side determines whether the received ID setting command is addressed to its own device. It cannot be determined whether this is not the case. In this regard, in this configuration, when an ID setting command is transmitted as communication data, destination information is given to each injector 10 through the sensor output line LS, and the ID setting command is transmitted in that state. Therefore, it is possible to appropriately assign the node ID to each injector 10, and thus it is possible to appropriately perform the fuel injection control of the engine.

  When any one of the injectors 10 is diagnosed as having a voltage abnormality in the sensor output line LS by the abnormality diagnosis process of FIG. 5, the transistor Tr11 connected to the sensor output line LS of the injector 10 that is the destination of the ID setting command is turned on. By switching to, the plurality of sensor output lines LS may be in a specific state, and a unique node ID cannot be assigned to each of the plurality of injectors 10. In this regard, according to the above configuration, when at least one of the plurality of injectors 10 is diagnosed as having a voltage abnormality in the sensor output line LS, the node IDs are not assigned to all the injectors 10. Therefore, it can be avoided that the fuel injection control of the engine is performed by setting an inappropriate node ID.

(Second Embodiment)
Next, a second embodiment of the present invention will be described focusing on differences from the first embodiment. In the first embodiment described above, by setting the voltage of the sensor output line LS to be different between the injector 10 that is the destination of communication data and the injector 10 that is not the destination by the on / off control of the transistor Tr <b> 11, the destination is set to each injector 10. The configuration has been described in which node ID is set by sending an ID setting command as communication data from the ECU 50 to the injector 10 in a state where information is given. On the other hand, in the present embodiment, by assigning information regarding the node ID as destination information to each injector 10 by the on / off control of the transistor Tr11, the node ID is set in each injector 10 (the destination information is added). In the completed state, the communication data is transmitted from the ECU 50 to the injector 10.

  Specifically, first, the microcomputer 53 of the ECU 50 switches the voltage of the sensor output line LS to a predetermined voltage by on / off control of the transistor Tr11, whereby the sensor output line LS is specified according to the node ID given to the injector 10. The continuation time continued in the state is set to a different time, and thereby, information relating to the destination of the communication data is given through the sensor output line LS (information giving means). The communication processing unit 17 of the injector 10 sets its own node ID based on the duration time. Thereafter, the ECU 50 transmits, as communication data, a number transmission command that requests the injector 10 to transmit its own individual number (transmission control means). This number transmission command includes the node ID of the cylinder on which the command is to be executed. When the communication processing unit 17 of the injector 10 receives the number transmission command, the communication processing unit 17 refers to the node ID included in the command, and executes processing based on the number transmission command when the node ID matches its own node ID ( Reception control means).

  This will be further described with reference to the time chart of FIG. In FIG. 8, the microcomputer 53 of the ECU 50 first transmits an ID assignment start command at the timing t30, and turns on all the transistors Tr11 at the timing t31. As a result, the voltages of all the sensor output lines LS are forcibly set to the ground voltage (= 0 V), and a low edge occurs in all the sensor output lines LS. Further, when a time T (# 1) corresponding to the node ID (“1” in the present embodiment) given to the injector # 1 elapses from the timing when the low edge occurs, the sensor output line LS # 1 at the timing t32. The transistor Tr # 1 connected to is turned off. As a result, a high edge is generated in the sensor output line LS # 1 at the timing t32. On the injector # 1 side, the time from the low edge to the high edge (t31 to t32) is measured, and the node ID corresponding to the measured value is stored in the memory 13 as the node ID assigned to itself.

  Similarly, for the other injectors, when the elapsed time from the timing when the low edge occurs becomes the time T (#x) (x = 2, 3, 4) corresponding to the node ID assigned to each injector 10. Then, the transistor Tr11 connected to the sensor output line LS of each injector 10 is turned off. In the present embodiment, the transistor Tr11 connected to the injector # 2 is turned off at timing t33, the transistor Tr11 connected to the injector # 3 is turned off at timing t34, and the transistor Tr11 connected to the injector # 4 is turned off at timing t35. Thus, node IDs are assigned to all the injectors 10. Thereafter, the microcomputer 53 of the ECU 50 transmits a number transmission command for transmitting its own individual number as communication data to the injector 10 through the communication line LC. This number transmission command includes a node ID, and the communication processing unit 17 of the injector 10 refers to the node ID included in the number transmission command, so that the number transmission command received this time is addressed to itself. Determine what you want to do or not. When the node ID included in the number transmission command is “1”, the communication processing unit 17 of the injector # 1 transmits its own individual number to the ECU 50 (timing t36).

  In the present embodiment, the microcomputer 53 of the ECU 50 executes the abnormality diagnosis process shown in FIG. 5 before transmitting the ID assignment start command (before t30). When it is diagnosed that there is no abnormality, the voltage of the sensor output line LS is switched by the transistor Tr11 to set the node ID. On the other hand, when it is diagnosed that there is an abnormality, the sensor output by the transistor Tr11 is set. Do not switch the voltage of the line LS. That is, when it is diagnosed that there is an abnormality by the abnormality diagnosis process of FIG. 5, all the processes related to the ID setting after timing t30 of FIG. By doing so, it is possible to omit a useless operation of performing the voltage switching process until the ID cannot be set, and it is possible to avoid further circuit failure.

(Other embodiments)
The present invention is not limited to the description of the above embodiment, and may be implemented as follows, for example.

  In the above embodiment, the ECU 50 includes means (abnormality diagnosis means) for diagnosing abnormality in the voltage of the sensor output line LS, and the microcomputer 53 outputs the sensor output based on the sensor output signal input to the A / D converter 53a. A configuration for diagnosing an abnormality in the voltage of the line LS is adopted. On the other hand, in this configuration, the communication processing unit 17 of the injector 10 includes abnormality diagnosis means, and the communication processing unit 17 diagnoses the abnormality of the sensor output signal based on the input signal from the voltage detection circuit 19. By transmitting the diagnosis result to the ECU 50 through the communication line LC, the ECU 50 recognizes an abnormality in the voltage of the sensor output line LS. Specifically, for example, the microcomputer of the communication processing unit 17 determines that the voltage of the sensor output line LS when the input signal from the voltage detection circuit 19 is in the Lo state for a predetermined time or longer in the off state of the transistor Tr11. Diagnose that there is an abnormality (ground short in this case). The communication processing unit 17 transmits this diagnosis result to the ECU 50 through the communication line LC. Further, the ECU 50 grasps whether or not the voltage of the sensor output line LS is abnormal based on the received diagnosis result, and does not perform the ID assignment process when there is an abnormality.

  In the second embodiment, a node ID is assigned to each injector 10 by setting the time during which the sensor output line LS is maintained in a specific state to a different time according to the node ID assigned to the injector 10. However, the present invention is not limited to this configuration as long as the node ID is assigned through the sensor output line LS by switching the voltage of the sensor output line LS. For example, the configuration of the output circuit in the pressure sensor 11 is configured such that the voltage of the sensor output signal can be variably set from 0 V to a power supply voltage (for example, 5 V) based on a command signal from the communication processing unit 17. First, the ECU 50 sends sweep command communication data for instructing the communication processing unit 17 of each injector 10 to sweep the voltage of the sensor output line LS from a specific start voltage (for example, 0 V). Send through LC. In addition, after transmitting the sweep command communication data, the ECU 50 turns on the transistor Tr11 and sets the voltage of the sensor output line LS to 0 V at a timing according to the node ID given to each injector 10. On the other hand, each communication processing unit 17 sweeps the voltage of the sensor output line LS from the start voltage based on the received sweep command communication data, and monitors the voltage of the sensor output line LS. Then, the node ID is set according to the voltage of the sensor output line LS at the timing when the voltage of the sensor output line LS becomes 0V (low edge timing) or the elapsed time from the start.

  In the first embodiment, the case where the ID setting command is transmitted as communication data has been described. However, the present invention can also be applied to the case where communication data different from the ID setting command is transmitted. For example, as communication data, a Read command for instructing reading of an injector characteristic value, a sensor characteristic value, and the like from the memory 13 of the injector 10 and a Write command for instructing to write a learning value about the injector characteristic value into the memory 13 are also included. The configuration of the invention can be applied.

  In the above embodiment, the case where the sensor unit of the injector 10 is the pressure sensor 11 that detects the fuel pressure as the engine fuel injection parameter has been described. However, the present invention is not limited to this, and for example, the temperature is used as the engine fuel injection parameter. You may apply this invention to the injector 10 provided with the temperature sensor to detect.

  DESCRIPTION OF SYMBOLS 10 ... Injector (fuel injection valve), 11 ... Pressure sensor (sensor part), 12 ... Output circuit, 13 ... Memory (memory | storage part), 15 ... Communication device (communication part), 17 ... Communication processing part (processing part), DESCRIPTION OF SYMBOLS 19 ... Voltage detection circuit, 30 ... EDU, 50 ... ECU (electronic control unit), 51 ... Communication device, 53 ... Microcomputer, 53a ... A / D converter, 53b ... Memory, 55 ... Input circuit, LC ... Communication line, LS ... sensor output line, Tr11 ... transistor (voltage switching means).

Claims (4)

A fuel injection control system comprising a plurality of fuel injection valves (10) and an electronic control unit (50) for performing fuel injection control of an engine by controlling driving of the plurality of fuel injection valves,
Each of the plurality of fuel injection valves includes a sensor unit (11) that detects a fuel injection parameter of the engine and outputs a signal thereof; a communication unit (15) that receives communication data from the electronic control unit; A processing unit (17) that executes processing based on communication data received by the communication unit;
The electronic control unit is connected to each of the plurality of fuel injection valves through an individual sensor output line (LS) and to each of the communication units through a common communication line (LC). And
Voltage switching means (Tr11) controlled by the electronic control unit and switching the voltage of the sensor output line to a predetermined voltage;
Information providing means for assigning destination information regarding the destination of the communication data to each of the plurality of fuel injection valves through the sensor output line by performing voltage switching by the voltage switching means;
Transmission control means for transmitting the communication data from the electronic control unit to the communication unit through the communication line in a state where the destination information is being assigned by the information granting means or in a state where the granting is completed,
Whether or not to execute processing based on the communication data based on the destination information in each processing unit of the plurality of fuel injection valves when the communication unit receives communication data transmitted by the transmission control unit A reception control means for determining whether or not
An abnormality diagnosing means for diagnosing an abnormality of the circuit based on the voltage of the sensor output line before the destination information is given by the information giving means;
When the abnormality diagnosing unit diagnoses that there is an abnormality, the information providing unit prohibits the addition of destination information, and when the abnormality diagnosing unit diagnoses that there is no abnormality, the information adding unit provides the destination information. Permission determination means for permitting,
A fuel injection control system comprising: The fuel injection control system according to claim 1, wherein the electronic control unit includes the abnormality diagnosis unit. The information providing means sets the non-target output line, which is a sensor output line connected to the sensor unit of the fuel injector that is not a destination of the communication data, to the first voltage state by the voltage switching means, and sets the communication data By setting a target output line, which is a sensor output line connected to the sensor unit of the fuel injection valve as a destination, to a second voltage state different from the first voltage state, each of the plurality of fuel injection valves , Giving the destination information through the sensor output line,
The transmission control means sets the communication data from the electronic control unit to the communication unit through the communication line in a state where the non-target output line is in the first voltage state and the target output line is in the second voltage state. To
The reception control means receives the communication data transmitted by the transmission control means when the communication output is received by the communication section when the sensor output line connected to the sensor section of the device is in the first voltage state. 3. The fuel injection control system according to claim 1, wherein the process based on the communication data is executed when the second voltage state is not executed. 4. The fuel injection control according to claim 3 , wherein the transmission control unit transmits an ID setting command that includes a node ID as the communication data and requests to set the node ID as a node ID of the own device to the communication unit. system.

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