JP5333358B2 - Vehicle control system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To impart a node ID to each vehicular component by an electronic control unit (ECU). <P>SOLUTION: This system 1 is constituted to connect the ECU 20 to an injector (INJ) 10 of each cylinder via a common communication line LC, and to input a signal from a pressure sensor 11 of each INJ 10 into the ECU 20 via a sensor line LS of every INJ 10. In the system 1, operations (1), (2) as follows are repeated to impart a communication ID to each INJ 10. (1) The INJ 10 not imparted yet with the ID selects one voltage out of plurality of ones at random, to be output to the sensor line LS, when a specified command is output from the ECU to the communication line LC. (2) The ECU outputs a determined command including the ID imparted to the INJ, and information indicating the voltage output from the INJ, to the communication line LC, when one having a unique voltage of the sensor line LS exists out of the INJ 10 not imparted yet with the ID, and each INJ stores the ID in the determined command as own ID, when the information in the determined command is same to own output voltage. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a vehicle control system that includes a plurality of vehicle components incorporating a sensor and a communication device and an electronic control unit.

  In the field of vehicle control, for example, it is known that a sensor and a memory are built in a part as an actuator such as an injector (fuel injection valve), and these are used as one vehicle part. In the manufacturing plant, solid characteristic values (in this case, initial characteristic values) of the vehicle parts are written. The characteristic values in the memory are read into an electronic control unit (ECU) that controls the vehicle parts and used for the control of the vehicle parts, and sensor signals that are output signals of the sensors are also sent to the electronic control unit. It is input and used to control the vehicle parts (see, for example, Patent Documents 1 and 2).

  In addition, a technique for preventing the learning value from being lost due to replacement of the electronic control device by writing the learning value obtained by the control by the electronic control device in the memory on the vehicle component side is also known. (For example, refer to Patent Document 1).

JP 2008-057413 A JP 2009-228681 A

  By the way, it is preferable that a signal from the vehicle component sensor as described above is input to the electronic control unit via an individual signal line for each vehicle component. This is because the sensor signal can be input to the electronic control device in real time.

  Moreover, in the above vehicle parts, the communication device for communicating with an electronic control apparatus will also be incorporated. This is because the electronic control unit accesses the memory of the vehicle component (read access or write access).

  And as a method of connecting a plurality of vehicle parts to the electronic control unit in a communicable manner, for example, there is also a method of connecting the communication device of each vehicle part to the electronic control unit with individual communication lines. When employed, it is necessary to provide a communication device for each vehicle component in the electronic control unit. For this reason, unlike the sensor of each vehicle component, it is preferable that the communication device of each vehicle component is bus-connected with the electronic control unit via a common communication line.

  However, in the bus connection method, a node ID is assigned to each vehicle component that becomes a communication node, and communication between the electronic control unit and each vehicle component is performed based on the node ID. Therefore, inconvenience occurs when the node ID is not correctly assigned to the vehicle part.

  For example, consider a case where an injector for each cylinder is connected to an electronic control unit via a common communication line as a plurality of vehicle parts. As is well known, in fuel injection control using an injector, an injection command signal for each cylinder is output from an electronic control unit to an electronic drive unit (EDU), and the electronic drive unit is activated according to the injection command signal. The injector for each cylinder is driven. That is, the injector is driven by a system different from the memory access via the communication line from the electronic control unit to the injector.

  Here, assuming that the node ID “1” is assigned to the injector of the first cylinder and the node ID “2” is assigned to the injector of the second cylinder, the electronic control unit transmits the characteristic value from each injector via the communication line. Incorrectly, the injector assigned the node ID “2” is attached to the first cylinder, and the injector assigned the node ID “1” is attached to the second cylinder. Consider the case where you have been.

  In this case, the electronic controller is physically connected to the injector assigned the node ID “2” as the injector of the first cylinder, and the injector assigned the node ID “1” as the injector of the second cylinder. Are physically connected.

  For this reason, the electronic control unit reads the characteristic value of the injector of the second cylinder from the injector of the second cylinder to which the node ID “1” is assigned as the characteristic value of the injector of the first cylinder. The injector of the first cylinder is controlled based on the injector of the first cylinder assigned the node ID “2” as the characteristic value of the injector of the second cylinder. And the injector of the second cylinder is controlled based on this characteristic value. Therefore, the control is hindered.

  The same inconvenience arises when, for example, the electronic control device corrects the sensor signal from the vehicle component using the characteristic value read from the memory of the vehicle component (specifically, corrects the input value of the sensor signal). It occurs in the same way. That is, in the above-described injector example, the electronic control unit corrects the sensor signal from the injector of the first cylinder based on the characteristic value acquired from the injector of the second cylinder assigned the node ID “1” via the communication line. In addition, the sensor signal from the injector of the second cylinder is corrected by the characteristic value acquired via the communication line from the injector of the first cylinder assigned the node ID “2”. The physical quantity measured by the sensor cannot be corrected accurately.

  That is, conventionally, when manufacturing a vehicle part, an invariable node ID is set in advance for the vehicle part. In this method, the above-described inconvenience (due to incorrect connection of the vehicle part to the electronic control unit) This causes a problem that actuator control and sensor signal correction cannot be performed correctly.

  Therefore, if the electronic control device can give a node ID to each vehicle component after the physical connection of the vehicle component to the electronic control device is completed, the present inventor will make a mistake in the connection of the vehicle component in the first place. It came to the idea that the above-mentioned problems could be prevented without happening.

  Therefore, according to the present invention, transmission of sensor signals from a plurality of vehicle components to the electronic control device is performed via individual signal lines for each vehicle component, while data communication between the electronic control device and each vehicle component is performed. In a vehicle control system that is performed via a common communication line, the electronic control device can give a node ID to each vehicle component after the physical connection of the vehicle component to the electronic control device is completed. The purpose is to do so.

First, as a premise, the vehicle control system of the present invention includes a plurality of vehicle components incorporating sensors and communication devices, and an electronic control unit.
And in this vehicle control system, the electronic control unit is communicable with each vehicle component via the communication line by being bus-connected via a communication line common to the communication device of each vehicle component, Furthermore, it is a signal line for transmitting a sensor signal which is an output signal of the sensor, and is connected to each vehicle component via a signal line provided for each vehicle component. In other words, transmission of sensor signals from each vehicle component to the electronic control device is performed via individual signal lines for each vehicle component, but data communication between the electronic control device and each vehicle component is performed using a common communication line. Done through.

  In addition, each vehicle part is communication data that the electronic control device outputs to the communication line with any one of a plurality of vehicle parts as a destination, and communication data including a node ID indicating the destination vehicle part, When the communication device receives, a determination process is performed to determine whether or not the node ID included in the received communication data matches the node ID of the vehicle part. Communication control means is provided for performing processing based on the received communication data and discarding the received communication data if the node IDs do not match.

  Here, in particular, in the vehicle control system according to the first aspect, the electronic control device includes selection voltage output command means and ID provision means as means for assigning the node ID to each vehicle component.

  The selection voltage output command means randomly selects one voltage value from among a plurality of voltage values equal to or greater than the number of vehicle parts for all vehicle parts, and signals the voltage of the selected voltage value. It is means for outputting communication data for selection voltage output command for causing the line to output instead of the sensor signal to the communication line.

  The ID assigning means operates every time the selection voltage output command means outputs the communication data for the selection voltage output instruction to the communication line, and corresponds to at least a vehicle part that has not yet been given a node ID among the signal lines. If there is a vehicle part for which the voltage output to the signal line is unique among the vehicle parts that have not yet been given the node ID, the unique voltage is output. As a process of assigning a node ID to a vehicle part, communication for ID assignment including a node ID assigned to the vehicle part and voltage value information indicating a voltage value output from the vehicle part to the signal line Processing to output data to the communication line is performed.

Each vehicle component includes a voltage value storage unit for storing one of a plurality of voltage values, a voltage output unit, and an ID setting unit.
The voltage output means determines whether or not the node ID has already been set in the vehicle part every time the communication device for the vehicle part receives the selection voltage output command communication data, and the node ID has already been set. If the node ID has not been set, the received selection voltage output command communication data is discarded, and one voltage value is randomly selected from the plurality of voltage values. The voltage value is output to a signal line connecting the vehicle part and the electronic control unit, and the selected voltage value is updated and stored in the voltage value storage means.

  When the communication device for the vehicle part receives the ID assignment communication data, the ID setting means, the voltage value indicated by the voltage value information included in the received ID assignment communication data, and the voltage of the vehicle part The voltage value stored in the value storage means is compared. If the two voltage values do not match, the received ID assignment communication data is discarded. If the two voltage values match, the reception is performed. The node ID included in the communication data for ID assignment is set as the node ID of the vehicle part used in the determination process.

  Note that “the process of setting as a node ID” performed by the ID setting means is specifically a process of storing the node ID in a node ID storage unit provided in the vehicle part, and this process is performed. Thus, the node ID is already set. The node ID storage unit is a storage unit for storing a node ID of the vehicle part and used in a determination process in the communication control unit.

  Further, in the vehicle control system according to claim 1, the selection voltage output command means of the electronic control device is configured such that the vehicle part to which the ID assigning means has already given the node ID is included in the signal line in the selection voltage output command communication data. Selection exclusion value information that can specify the value of the voltage being output is included, and the voltage output means of each vehicle component selects one voltage value from among the plurality of voltage values. In the above-described plurality of voltage values, one voltage value is randomly selected from the voltage values excluding the voltage value specified by the selection exclusion value information included in the received communication data for selection voltage output command. To choose.

  Then, when the specific timing for giving the node ID to the vehicle part has arrived, the electronic control unit repeatedly operates the selection voltage output command means until the ID giving means gives the node ID to all of the vehicle parts, and the ID giving If the means assigns node IDs to all of the vehicle parts, voltage output stop command communication data for stopping outputting a voltage different from the sensor signal to the signal line for all of the vehicle parts, Output to the communication line.

  Note that the specific timing at which the node ID should be given to the vehicle part may be, for example, when the electronic control device is activated, but may be any other timing. For example, an initial setup command is input to the electronic control device from the outside. It may be time.

  The voltage output means of each vehicle component stops output of the voltage to the signal line when the communication device for the vehicle component receives the voltage output stop command communication data, and a sensor signal is output to the signal line. So that

In such a vehicle control system according to the first aspect, when the specific timing arrives, a node ID is assigned to each vehicle part from the electronic control device by the following operation, and the node ID is set to the vehicle part.
(A) First, in the electronic control unit, the selection voltage output command means outputs selection voltage output command communication data to the communication line.
(B) Then, the communication data for the selection voltage output command is received by the communication device of each vehicle component.

Then, in each vehicle part, the voltage output means operates. At this time, since the node ID is not set in all the vehicle parts, there are a plurality of voltage output means (here, N ways) for each vehicle part. One voltage value is randomly selected from the voltage values, and the voltage of the selected voltage value is output to the signal line, and the selected voltage value is updated and stored in the voltage value storage means. .
(C) On the other hand, in the electronic control unit, the ID assigning means monitors the voltage of each signal line, and among the vehicle parts (all vehicle parts at this time) to which no node ID has been assigned yet, the signal line If there is a vehicle part with a unique output voltage, a node ID assigned to the vehicle part and the vehicle are assigned to the vehicle part outputting the unique voltage. Communication data for giving ID including voltage value information indicating the value of the voltage output by the component to the signal line is output to the communication line.
(D) The communication data for ID assignment is received by the communication device of each vehicle component.

  And in the vehicle parts in which the output voltage to the signal line is not unique (that is, a plurality of vehicle parts that output the same voltage), the voltage indicated by the voltage value information in the received ID assignment communication data Since the value and the voltage value stored in the voltage value storage means do not match, the ID setting means discards the received ID assignment communication data.

  Further, in the vehicle part in which the output voltage to the signal line is unique, the voltage value indicated by the voltage value information in the received ID assignment communication data and the voltage value stored in the voltage value storage means are Since they match, the ID setting means sets the node ID in the received ID assignment communication data as the node ID of the vehicle part. Therefore, the node ID is assigned from the electronic control unit only for the vehicle part in which the output voltage to the signal line is unique, and the node ID is set.

If the voltages of all the signal lines are all different in the stage (C) (that is, if all the vehicle parts output unique voltages), the above (C) and (D ) Completes the assignment and setting of node IDs to all vehicle parts.
(E) Moreover, if the voltage of all signal lines is not all different and there is a signal line of the same voltage (that is, if there is a vehicle part whose output voltage to the signal line is not unique) In the electronic control unit, the selection voltage output command means outputs the selection voltage output command communication data to the communication line again.

However, in this case, the selection voltage output command means can specify the value of the voltage output to the signal line by the vehicle part that has already been given the node ID by the ID giving means in the communication data for the selection voltage output command. Include selection exclusion value information.
(F) The selection voltage output command communication data is received by the communication device of each vehicle component.

  Among the vehicle parts, in the vehicle parts for which the node ID has been set, the voltage output means discards the received selection voltage output command communication data, and the output voltage to the signal line does not change.

In addition, in the vehicle part in which the node ID has not been set, the voltage output means again selects one voltage value. At that time, the voltage value is received this time among a plurality (N) of voltage values. One voltage value is randomly selected from the voltage values excluding the voltage value specified by the selection exclusion value information included in the selection voltage output command communication data (that is, the voltage value that has already become unique). Then, the voltage of the selected voltage value is output to the signal line, and the selected voltage value is updated and stored in the voltage value storage means.
(G) On the other hand, in the electronic control unit, the ID assigning means monitors at least the voltage of the signal line corresponding to the vehicle part to which no node ID has been assigned among the respective signal lines, and still provides the node ID. If there is a vehicle part that has a unique voltage output to the signal line among the vehicle parts that are not, the node ID is assigned to the vehicle part that outputs the unique voltage. ID assignment communication data including a node ID assigned to the vehicle part and voltage value information indicating a voltage value output from the vehicle part to the signal line is output to the communication line.
(H) Then, the communication data for providing ID is received by the communication device of each vehicle component.

  Then, as in the case of (D) above, in the vehicle part in which the output voltage to the signal line is not unique, the ID setting means discards the received ID assignment communication data. In the vehicle part in which the node ID is not set and the output voltage to is unique, the ID setting means sets the node ID in the received ID assignment communication data as the node ID of the vehicle part. .

And the operation | movement of said (E)-(H) is repeated until assignment | providing and setting of node ID with respect to all the vehicle components are completed.
When the assignment and setting of the node IDs for all the vehicle parts are completed by the above-described operation of each unit, the electronic control unit outputs the voltage output stop command communication data to the communication line.

  The voltage output stop command communication data is received by the communication device of each vehicle component. Then, the voltage output means of each vehicle component stops outputting the voltage to the signal line so that the sensor signal is output to the signal line.

  According to the vehicle control system of claim 1 as described above, after the physical connection of the vehicle component to the electronic control device is completed, the electronic control device can give the node ID to each vehicle component. become able to. Therefore, it is not necessary to set an invariant node ID for the vehicle part at the time of manufacturing the vehicle part, and it is possible to prevent the above-described malfunction due to the erroneous connection of the vehicle part.

  Next, in the vehicle control system according to claim 2, in the vehicle control system according to claim 1, the voltage value storage means of each vehicle component is a nonvolatile memory capable of rewriting data, and the voltage value storage means. If any one of the plurality of voltage values is stored as an initial value at the time of manufacturing the vehicle part, and the ID setting means of the vehicle part sets the node ID of the vehicle part, The voltage value stored at that time (that is, when the node ID is set) is stored as it is.

The electronic control device further includes initial voltage output command means as means for assigning a node ID to each vehicle component.
The initial voltage output command means outputs initial voltage output command communication data for outputting the voltage of the voltage value stored in the voltage value storage means to the signal line instead of the sensor signal for all vehicle parts. , Means for outputting to the communication line.

  The ID assigning means of the electronic control device operates after the initial voltage output command means outputs the initial voltage output command communication data to the communication line, monitors the voltage of each signal line, and outputs it to the signal line. If there is a vehicle part with a unique voltage, the node ID assigned to the vehicle part and the vehicle part are signals as a process of assigning the node ID to the vehicle part outputting the unique voltage. A process of outputting the ID giving communication data including the voltage value information indicating the value of the voltage output to the line to the communication line is performed.

  In addition, when the communication device receives the initial voltage output command communication data, the voltage output means of each vehicle part uses the voltage of the voltage value stored in the voltage value storage means as the vehicle part and the electronic control unit. To the signal line connecting

  Then, the electronic control unit activates the initial voltage output command means when a specific timing at which the node ID should be given to the vehicle parts, and if the ID giving means gives the node ID to all the vehicle parts, the selection is made. The voltage output stop command communication data is output to the communication line without operating the voltage output command means. Moreover, even if the electronic control device operates the initial voltage output command means, and there is a vehicle part for which the ID assignment means did not assign the node ID, the ID assignment means assigns the node ID to all the vehicle parts. Until the selection voltage output command means is operated repeatedly until the ID giving means gives the node ID to all the vehicle parts, the voltage output stop command communication data is outputted to the communication line.

In such a vehicle control system according to the second aspect, when a specific timing arrives, a node ID is assigned to each vehicle part from the electronic control device by the following operation, and the node ID is set to the vehicle part.
(A) First, in the electronic control unit, the initial voltage output command means outputs the initial voltage output command communication data to the communication line.
(B) Then, the communication data for the initial voltage output command is received by the communication device of each vehicle component.

Then, in each vehicle component, the voltage output means outputs the voltage of the voltage value stored in the voltage value storage means to the signal line connecting the vehicle component and the electronic control device.
(C) On the other hand, in the electronic control unit, the ID assigning means monitors the voltage of each signal line, and if there is a vehicle part in which the voltage output to the signal line is unique, the unique voltage is obtained. In order to assign a node ID to the vehicle part being output, an ID assignment including a node ID assigned to the vehicle part and voltage value information indicating a voltage value output from the vehicle part to the signal line Communication data is output to the communication line.
(D) Then, the same operation as the above (D) is performed, and the node ID given from the electronic control unit is set in the vehicle part in which the output voltage to the signal line is unique.

  If the voltages of all the signal lines are all different in the step (c), the node IDs are assigned and set for all the vehicle parts by the operations (c) and (d). Thus, the electronic control unit outputs the communication data for the voltage output stop command to the communication line without operating the selection voltage output command means.

  If there is a signal line with the same voltage in the stage (c) (that is, if there is a vehicle part whose output voltage to the signal line is not unique), the same as (E) above. Operation is performed. That is, the electronic control unit operates the selection voltage output command means, and the selection voltage output command means outputs the communication data for selection voltage output command to the communication line. In this case, if there is already a vehicle part to which a node ID is assigned, the selection voltage output command means includes selection exclusion value information in the selection voltage output command communication data.

  And after that, the operation of (E) to (H) is repeated until the assignment and setting of node IDs for all vehicle parts is completed, and when the assignment and setting of node IDs for all vehicle parts are completed, The electronic control unit outputs the voltage output stop command communication data to the communication line.

  Here, when the specific timing comes first after the physical connection of the vehicle parts to the electronic control unit is completed, the voltage value storage means of each vehicle part is stored in the voltage value storage means in the stage (b) above. Therefore, the voltage output means of each vehicle component outputs the voltage of the initial value to the signal line. Therefore, in that case, there is a possibility that there is a vehicle part that outputs the same voltage in the stage (c), and there is a possibility that the operations (E) to (H) are performed.

  On the other hand, when the second and subsequent specific timings have arrived after the physical connection of the vehicle parts to the electronic control device is completed, the voltage value storage means of each vehicle part has different voltage values. Since the value is stored, in the stage (b), the voltage output means of each vehicle component outputs a different voltage to the signal line. Therefore, in this case, in the stage (c), the voltages of all the signal lines are all different. Eventually, the above operations (E) to (H) are performed without performing the operations (E) to (H). Only the operation of d) completes the assignment and setting of node IDs to all vehicle parts.

  Thus, according to the vehicle control system of the second aspect, when the node ID is assigned for the second and subsequent times for the same vehicle part that has not been replaced, the time required for assigning and setting the node ID to each vehicle part is set. It can be shortened.

It is a block diagram showing the whole structure of the fuel-injection control system of a reference example and an Example. It is a block diagram showing the structure of the injector and ECU of a reference example. It is a flowchart showing the ID provision process by the side of ECU of the reference example, and the ID setting process by the side of an injector. It is a flowchart showing the collation process by the side of ECU, and the request response process by the side of an injector. It is a time chart for demonstrating the effect | action of a reference example. It is a block diagram showing the structure of the injector and ECU of an Example. It is a flowchart showing the ID provision process by the side of ECU, and the ID setting process by the side of an injector of an Example. It is a flowchart showing a random number generation process. It is a time chart for demonstrating the effect | action of an Example. It is a flowchart showing a modification.

Embodiments of the present invention will be described below with reference to the drawings. Reference examples will be described first, and then embodiments of the present invention will be described.
[Reference example]
FIG. 1 is a configuration diagram showing an overall configuration of a fuel injection control system 1 (corresponding to a vehicle control system) of a reference example (the same applies to the embodiments described later).

  The fuel injection control system 1 controls fuel injection to a multi-cylinder (4 cylinders in this example) engine mounted on a vehicle (automobile), and includes an injector (INJ) 10 for each cylinder, An electronic control unit (hereinafter referred to as ECU) 20 that performs control, and an electronic drive unit (hereinafter referred to as EDU) 30 that drives each injector 10 in accordance with an injection command signal for each cylinder from ECU 20 are provided.

  In the drawings and in the following description, # 1 to # 4 mean each of the first to fourth cylinders of the engine. For example, the words and symbols given (# 1) are the words and symbols. Indicates that it corresponds to # 1. Further, n in #n is any one of 1 to 4, and #n means that the cylinders are not particularly distinguished.

  Each injector 10 includes a pressure sensor 11 that detects fuel pressure, an EEPROM 13 that is an electrically rewritable nonvolatile memory, and a communication driver 15 that is a communication device for communicating with the ECU 20. , Built-in.

  The pressure sensor 11 is provided, for example, at a fuel supply port for taking high-pressure fuel into the injector 10 and detects the fuel pressure (so-called inlet pressure) at the fuel supply port. For this reason, the fuel pressure detected by the pressure sensor 11 is changed by the fuel injection operation of the injector 10, and the ECU 20 monitors the output signal (sensor signal) of the pressure sensor 11, thereby the actual fuel of the injector 10. The injection state can be grasped.

  An analog sensor signal output from the pressure sensor 11 of each injector 10 is input to the ECU 20 via a sensor line (signal line for sensor signal) LS that is an individual signal line for each injector 10. .

On the other hand, the communication driver 15 of each injector 10 is connected (bus connected) to the ECU 20 via a common communication line LC.
The EEPROM 13 of each injector 10 has a characteristic value (injector characteristic value) representing the injection characteristic of the injector 10, a characteristic value (sensor characteristic value) representing the output characteristic of the pressure sensor 11 built in the injector 10, The serial number of the injector 10 is stored.

  For example, as the injector characteristic value, the injection start delay time from the start of driving of the injector 10 until the actual start of fuel injection, the maximum injection rate, and the actual end of fuel injection from the end of driving of the injector 10 are performed. Until the end of the injection end. Further, for example, the sensor characteristic value indicates a deviation from the standard relationship between the voltage value of the sensor signal and the fuel pressure. In the ECU 20, correction information of the sensor signal (specifically, the fuel value is calculated from the voltage value of the sensor signal. It is used as correction information when determining the pressure.

In the manufacturing factory of the injector 10, the EEPROM 13 of each injector 10 stores an initial characteristic value that is an initial value of each characteristic value and a manufacturing number.
On the other hand, the ECU 20 performs processing for communication between the communication driver 21 connected to the communication line LC connected to the communication driver 15 of the injector 10 of each cylinder and the injector 10 through the communication driver 21, and for fuel injection control. And a microcomputer (microcomputer) 23 that executes various processes.

  Further, the ECU 20 forcibly sets the voltage of the sensor line LS of each injector 10 to the ground voltage (the voltage of the ground line = 0V) in accordance with a command from the microcomputer 23. A switching circuit 25 is provided.

  In the ECU 20, the microcomputer 23 changes the voltage of each sensor line LS from the voltage of the normal sensor signal (for example, 1 V to 4 V in this example) to the ground voltage by the state switching circuit 25, thereby each sensor line LS. A node ID assigned to the injector 10 is transmitted to the injector 10 connected to the LS (details will be described later).

  Further, the microcomputer 23 has a built-in A / D converter 23a (see also FIG. 2), and sensor signals input from the sensor lines LS to the ECU 20 are A / D converted by the A / D converter 23a. It is converted and used for fuel injection control executed by the microcomputer 23.

The microcomputer 23 performs, for example, the following processes (S1) to (S6) on the injector 10 of each cylinder as the fuel injection control process.
(S1) An injection command for realizing an injection state from a target injection state (for example, an injection start timing, an injection end timing, and an injection amount) calculated based on control parameters such as engine speed and accelerator opening. A control map for obtaining signal output timing (timing to make an active level) and pulse width (active level time) is created using the injector characteristic values read from the injector 10 via the communication line LC, and the control is performed. A process of storing the map for use in a backup RAM (not shown) in the microcomputer 23 or a data rewritable nonvolatile memory (not shown) such as an EEPROM provided in the ECU 20. That is, based on the injector characteristic value in the injector 10, a control map that defines the correspondence between the injection state and the injection command signal is created.

(S2) A process of calculating a target injection state based on control parameters such as engine speed and accelerator opening.
(S3) A process of calculating the output timing and pulse width of an injection command signal for realizing the injection state by applying the target injection state calculated in (S2) to the control map.

  (S4) By setting the output timing and pulse width of the injection command signal calculated in the above (S3) in the timer in the microcomputer 23, the injection command signal that becomes the active level by the set pulse width is set. Processing to output to the EDU 30 at the output timing.

  (S5) In the pressure fluctuation monitoring period including the drive period of the injector 10 (period in which the injection command signal is at the active level), the sensor signal from the sensor line LS connected to the drive target injector 10 is sent at regular intervals (for example, several A / D conversion is performed every 10 μs), each A / D conversion value is sequentially stored in the RAM in the microcomputer 23, and further, the fuel at each time is determined from the stored time-series A / D conversion value. The fluctuation value of the pressure and the fuel pressure is detected, the injection state such as the actual injection start timing and the maximum injection rate is estimated from the detection result, and the learning value for correcting the control map from the estimation result Processing to calculate.

  As described above, when obtaining the fuel pressure from the A / D conversion value of the sensor signal, the sensor characteristic value read from the injector 10 via the communication line LC is used. Further, the characteristic values (sensor characteristic value and injector characteristic value) read from each injector 10 are stored in a data rewritable nonvolatile memory such as an EEPROM provided in the ECU 20.

  (S6) A process of correcting the control map used in (S3) with the learned value. That is, since it is considered that the characteristics of the injector 10 change with the passage of time, the accuracy of fuel injection control can be improved by performing the processing of (S5) and (S6).

  Then, the microcomputer 23 outputs an injection command signal corresponding to each injector 10 (in other words, an injection command signal for each cylinder) to the EDU 30 through a control line different from the communication line LC and the sensor line LS. Thus, fuel injection control is realized. The EDU 30 opens the #n injector 10 while the #n injection command signal is at the active level.

Next, FIG. 2 is a configuration diagram showing the configuration of the injector 10 and the ECU 20.
As shown in FIG. 2, the injector 10 includes a communication processing unit 16 that performs processing for communication and an edge determination circuit 17 in addition to the pressure sensor 11, the EEPROM 13, and the communication driver 15.

  In the injector 10, the communication driver 15 outputs the communication data received via the communication line LC to the communication processing unit 16, and transmits the communication data to be transmitted input from the communication processing unit 16 to the communication line LC. Output between the injector 10 and the ECU 20 to achieve communication.

  In particular, when the communication driver 15 receives the communication data including the node ID from the ECU 20, the communication processing unit 16 matches the node ID included in the received communication data with the node ID of the injector 10. If the node IDs match, a process based on the received communication data (that is, a process instructed by the received communication data) is performed, and the node IDs do not match In the case, the received communication data is discarded.

The communication data including the node ID is destination designation communication data output from the ECU 20 to the communication line LC with any one of the plurality of injectors 10 as a destination.
For example, as the destination designation communication data, any one of the injectors 10 is requested to read and transmit the manufacturing number in the EEPROM 13 or the characteristic value in the EEPROM 13 is requested to be transmitted. There is something. In addition, the destination designation communication data includes a learning value calculated by the ECU 20 and also instructs to write the learning value in the EEPROM 13.

  For this reason, each of the injectors 10 must have its own node ID uniquely set. In this example, as will be described later, the ECU 20 gives each injector 10 a unique node ID (respectively). Different node IDs) are assigned.

  The edge discriminating circuit 17 provided in the injector 10 is a circuit that functions when the ECU 20 assigns a node ID to each injector 10, and the voltage of the sensor line LS of the injector 10 is higher than the ground voltage. Detects a change from a high normal sensor signal voltage to a ground voltage (hereinafter referred to as “low edge”) and a change from a ground voltage to a normal sensor signal voltage (hereinafter referred to as “high edge”). To do. When the edge determination circuit 17 detects that a low edge and a high edge have occurred, the edge determination circuit 17 notifies the communication processing unit 16 of that fact (a low edge and a high edge have occurred).

  As shown in FIG. 2, in the ECU 20, each of the state switching circuits 25 provided for each sensor line LS is an NPN type in which a collector is connected to the sensor line LS and an emitter is connected to the ground line. It consists of a transistor 25a. Then, when the transistor 25a is turned on by a command from the microcomputer 23, the voltage of the sensor line LS is forcibly changed to the ground voltage. Therefore, a low edge occurs in the voltage of the sensor line LS. When the transistor 25a returns from on to off, the voltage of the sensor line LS changes from the ground voltage to the voltage of the normal sensor signal (> 1V), and a high edge is generated.

  On the other hand, when the vehicle is in an ignition-on state (that is, a state in which the battery voltage is supplied to the ignition power supply line in the vehicle), the ECU 20 and the EDU 30 are activated by being supplied with the operation power. Then, when the vehicle is in an ignition-off state and a predetermined power-off condition is satisfied, the supply of operating power to the ECU 20 and the EDU 30 is stopped. 2 is supplied with a constant power supply voltage (for example, 5V) from the ECU 20 while the power supply for operation is supplied to the ECU 20.

  Next, the ECU 20 recognizes the node ID assigned from the ECU 20 in each injector 10 and sets the node ID as its own node ID, which is executed to assign a node ID to each injector 10. The ID setting process performed in FIG. 3 will be described with reference to FIG.

  First, FIG. 3A is a flowchart showing an ID assignment process performed in the ECU 20. This ID assigning process is executed by the microcomputer 23 when the ECU 20 is activated after the vehicle is in an ignition-on state, for example. In addition, instead of executing the ID assigning process every time the ECU 20 is activated, the ID assigning process may be executed when an initial setup execution command is input from the outside.

  As shown in FIG. 3 (A), when the microcomputer 23 of the ECU 20 starts executing the ID assigning process, first, in S110, communication data for notifying that all of the injectors 10 are to be given node IDs. Is output from the communication driver 21 to the communication line LC. This ID assignment start command is not destination designation communication data but broadcast communication data destined for all the injectors 10.

  Then, in next S120, the injector 10 receives the ID assignment start command and waits until a predetermined time that is considered to be ready for node ID recognition start elapses. When the predetermined time elapses, the process proceeds to next S130. All sensor lines LS are fixed to low. Specifically, the transistors 25a of all the state switching circuits 25 are turned on, and the voltages of all the sensor lines LS are forcibly set to the ground voltage (= 0V). Then, a low edge is generated in all the sensor lines LS all at once.

  Next, in S140, after fixing all the sensor lines LS to low in S130, a time T (corresponding to the node ID (“1” in this example) given to the injector (# 1) 10 of # 1). It is determined whether or not # 1) has elapsed.

  If it is determined that the time T (# 1) has not elapsed, the process proceeds to S160 as it is, but if it is determined that the time T (# 1) has elapsed, the process proceeds to S150. By turning off the transistor 25a of the state switching circuit 25 corresponding to the sensor line (# 1) LS connected to the injector 10 of # 1, the low fixation of the sensor line (# 1) LS is released. Then, a high edge is generated in the sensor line (# 1) LS. Then, the process proceeds to S160.

  In S160, after fixing all the sensor lines LS to low in S130, time T (# 2) corresponding to the node ID (in this example, “2”) to be given to the injector (# 2) 10 of # 2. It is determined whether or not elapses.

  If it is determined that the time T (# 2) has not elapsed, the process proceeds directly to S180. If it is determined that the time T (# 2) has elapsed, the process proceeds to S170. By turning off the transistor 25a of the state switching circuit 25 corresponding to the sensor line (# 2) LS connected to the injector 10 of # 2, the low fixation of the sensor line (# 2) LS is released. Then, a high edge is generated in the sensor line (# 2) LS. Then, the process proceeds to S180.

  In S180, after fixing all the sensor lines LS to low in S130, time T (# 3) corresponding to the node ID (“3” in this example) to be given to the injector (# 3) 10 of # 3. It is determined whether or not elapses.

  If it is determined that the time T (# 3) has not elapsed, the process proceeds to S200 as it is, but if it is determined that the time T (# 3) has elapsed, the process proceeds to S190. , By turning off the transistor 25a of the state switching circuit 25 corresponding to the sensor line (# 3) LS connected to the injector 10 of # 3, the low fixation of the sensor line (# 3) LS is released. Then, a high edge is generated in the sensor line (# 3) LS. Then, the process proceeds to S200.

  In S200, after fixing all the sensor lines LS to low in S130, a time T (# 4) corresponding to the node ID (“4” in this example) given to the injector (# 4) 10 of # 4. It is determined whether or not elapses.

  If it is determined that the time T (# 4) has not elapsed, the process proceeds to S220. If it is determined that the time T (# 4) has elapsed, the process proceeds to S210. By turning off the transistor 25a of the state switching circuit 25 corresponding to the sensor line (# 4) LS connected to the injector 10 of # 4, the low fixation of the sensor line (# 4) LS is released. Then, a high edge is generated in the sensor line (# 4) LS. Then, the process proceeds to S220.

  The times T (# 1) to T (# 4) are different times. In this example, as an example, “T (# 1) = 1 ms, T (# 2) = 2 ms, T (# 3) = 3 ms, T (# 4) = 4 ms ”.

  In S220, it is determined whether or not the assignment of node IDs to all the injectors 10 has been completed. Specifically, it is determined whether or not the row fixing of all the sensor lines LS has been released after the four processes of S150, S170, S190, and S210 have been completed.

  If node ID assignment to all the injectors 10 has not been completed, the process returns to S140, but if node ID assignment to all the injectors 10 has been completed, the process proceeds to S230.

  In S230, an ID assignment end command, which is communication data for notifying the end of node ID assignment to all the injectors 10, is output from the communication driver 21 to the communication line LC, and then the ID assignment process is terminated. . Note that the ID assignment end command is not destination designation communication data but broadcast communication data destined for all injectors 10.

Next, FIG. 3B is a flowchart showing an ID setting process performed in each injector 10. This ID setting process is performed by the communication processing unit 16.
As shown in FIG. 3B, in the ID setting process, first, in S310, it is determined whether or not the communication driver 21 has received an ID assignment start command from the ECU 20. When the ID assignment start command is received, the process proceeds to S320.

  In S320, the node ID in the injector (#n) 10 is permitted to be rewritten and the node ID is initialized. Specifically, the communication processing unit 16 includes a node ID storage unit (not shown) that is a memory for storing the node ID, permits data rewriting to the node ID storage unit, and uses the node ID. The storage unit is initialized.

  The node ID storage unit may be either a volatile memory or a nonvolatile memory. In the latter case, a predetermined area of the EEPROM 13 may be used as the node ID storage unit. However, if the ECU 20 (specifically, the microcomputer 23) performs the ID assigning process of FIG. 3A every time it is activated, the node ID storage unit does not have to be a non-volatile memory.

  Next, in S330, it is determined whether or not the edge determination circuit 17 has detected that a low edge has occurred in the sensor line (#n) LS of the injector (#n) 10. If the low edge of the sensor line (#n) LS is not detected, the process proceeds to S350 as it is, but if the low edge of the sensor line (#n) LS is detected, the process proceeds to S340 and the sensor line (#n ) The measurement of the low time, which is the continuation time during which LS is at the ground voltage, is started, and then the process proceeds to S350.

  In S330, an affirmative determination is made only once after the ID assignment start command is received. That is, in S330, it is determined whether or not the edge determination circuit 17 has changed from a state in which the low edge is not detected to a state in which the low edge is detected. For this reason, when a low edge occurs in the sensor line (#n) LS and measurement of the low time is started in S340, a negative determination is made in subsequent S330, and the process directly proceeds to S350.

  In S350, it is determined whether or not the edge determination circuit 17 has detected that a high edge has occurred in the sensor line (#n) LS of the injector (#n) 10. If the high edge of the sensor line (#n) LS is not detected, the process proceeds to S380 as it is. If the high edge of the sensor line (#n) LS is detected, the process proceeds to S360 to measure the low time. finish. Then, in subsequent S370, the node ID assigned to the injector (#n) 10 by the ECU 20 is identified from the measured value of the low time, and the identified node ID is set as the node ID of the injector (#n) 10. After writing in the node ID storage unit, the process proceeds to S380.

  In S370, specifically, if the low time is a value within a specified range considered to be “T (# 1) = 1 ms” (for example, a value of “1 ± 0.4” ms), the node ID “1” is set. ”Is assigned, and if the low time is a value within a specified range that is considered to be“ T (# 2) = 2 ms ”(for example, a value of“ 2 ± 0.4 ”ms), the node ID“ 2 ”is If it is determined that the low time is within a specified range that is considered to be “T (# 3) = 3 ms” (for example, a value of “3 ± 0.4” ms), the node ID “3” is assigned. If the low time is a value within a specified range considered to be “T (# 4) = 4 ms” (for example, a value of “4 ± 0.4” ms), it is determined that the node ID “4” is given. To do. That is, the communication processing unit 16 of the injector 10 stores the same content as that stored on the ECU 20 side as time-to-ID relationship information indicating the correspondence relationship between the low time and the node ID. On the 10 side, the node ID assigned by the ECU 20 is specified from the time-to-ID relationship information and the measured value of the low time.

  In S350, as in S330, an affirmative determination is made only once after the ID assignment start command is received. That is, in S350, it is determined whether or not the edge determination circuit 17 has changed from a state in which no high edge is detected to a state in which a high edge is detected. For this reason, when a high edge occurs in the sensor line (#n) LS and the processes of S360 and S370 are performed, a negative determination is made in subsequent S350, and the process directly proceeds to S380.

  In S380, the communication driver 21 determines whether or not an ID assignment end command is received from the ECU 20, and if an ID assignment end command is not received, the process returns to S330, but if an ID assignment end command is received. If yes, go to S390. In S390, rewriting of the node ID in the injector (#n) 10 (that is, rewriting of data in the node ID storage unit) is prohibited, and the process returns to S310.

Next, the effect | action by the process of FIG. 3 is demonstrated using FIG.
First, as shown in (1) in FIG. 5, an ID assignment start command is transmitted from the ECU 20 to all the injectors 10 (S110).

Then, as shown in (2) in FIG. 5, each injector 10 permits rewriting and initialization of its own node ID (S320).
Then, as shown in (3) in FIG. 5, the ECU 20 fixes all the sensor lines LS to low at the same time (S130). In the following, this time point is referred to as a simultaneous row fixing time.

  Thereafter, as shown in (4-1) in FIG. 5, when the time T (# 1) has elapsed since the simultaneous low fixing, the ECU 20 releases the low fixing of the sensor line (# 1) LS, A high edge is generated in the sensor line (# 1) LS (S140: YES → S150).

  Similarly, as shown in each of (4-2) to (4-4) in FIG. 5, the ECU 20 detects the sensor line (# 2) when time T (# 2) has elapsed since the simultaneous low fixing. The LS low fixation is released (S160: YES → S170), and when the time T (# 3) has elapsed since the simultaneous low fixation, the sensor line (# 3) LS low fixation is released (S180: YES → S190) When the time T (# 4) has elapsed since the simultaneous low fixation, the low fixation of the sensor line (# 4) LS is released (S200: YES → S210).

  On the other hand, each injector (#n) 10 measures the low time of the sensor line (#n) LS connected to itself (S330 to S360). Then, from the measured value of the low time, the node ID assigned to the injector (#n) 10 by the ECU 20 is specified, and the specified node ID is written in the node ID storage unit as its own node ID (S370).

  That is, at the time of (4-1) in FIG. 5, since the measured value of the low time is T (# 1) in the injector (# 1) 10, the node ID “1” corresponding to T (# 1) Is stored in the node ID storage unit as its own node ID, and at the time of (4-2) in FIG. 5, the measured value of the low time is T (# 2) in the injector (# 2) 10. Therefore, the node ID “2” corresponding to the T (# 2) is stored in the node ID storage unit as its own node ID. Further, at the time point (4-3) in FIG. 5, since the measured value of the low time is T (# 3) in the injector (# 3) 10, the node ID “3” corresponding to T (# 3) ”Is stored in the node ID storage unit as its own node ID, and at the time of (4-4) in FIG. 5, the measured value of the low time is T (# 4) in the injector (# 4) 10. Therefore, the node ID “4” corresponding to T (# 4) is stored in the node ID storage unit as its own node ID.

  When the assignment of node IDs to all the injectors 10 by the ECU 20 is completed, an ID assignment end command is transmitted from the ECU 20 to all the injectors 10 as shown in (5) in FIG. 5 (S230).

Then, as shown in (6) in FIG. 5, each injector 10 is prohibited from rewriting its own node ID (S390).
With the above operation, the node ID is assigned from the ECU 20 to each injector 10, and the assigned node ID is stored in each injector 10.

Next, a process performed subsequent to the process of FIG. 3 in the ECU 20 and each injector 10 will be described with reference to FIG.
First, FIG. 4A is a flowchart showing a collation process executed immediately after the microcomputer 23 of the ECU 20 finishes the ID assigning process of FIG.

  As shown in FIG. 4A, when the microcomputer 23 of the ECU 20 starts executing the collation process, first, in S410, “X” that is the value of the counter X is initialized to 0, and in the next S420. “X” is incremented (+1).

In the next S430, the communication driver 21 outputs a collation request that is destination designation communication data including “X” as the node ID to the communication line LC.
The collation request is communication data for transmitting the serial number stored in the EEPROM 13 to the destination injector 10 indicated by the node ID included therein. Then, the injector 10 which is the destination (transmission destination) of the collation request, the communication data including the serial number stored in its own EEPROM 13 (hereinafter referred to as serial number communication data) by the process of FIG. Will be output to the communication line LC.

  Therefore, the ECU 20 waits until the serial number communication data transmitted from the injector 10 that is the destination of the verification request is received by the communication driver 21 in the next S440, and if the serial number communication data is received, the process proceeds to S450. Proceed to Note that since the serial number communication data is transmitted only to one injector 10 that is the destination of the verification request, there is no problem even if the serial number communication data does not include an identifier indicating the transmission source. Absent.

  In S450, the received manufacturing number (specifically, the manufacturing number included in the received manufacturing number communication data) and the injector 10 of the node ID “X” (that is, the node ID “X” in the process of FIG. 3A). It is determined whether or not the stored manufacturing number of the injector 10 with respect to the injector 10) to which “” is given matches, and if both manufacturing numbers match, the process proceeds to S480 as it is.

  On the other hand, if it is determined in S450 that the two manufacturing numbers do not match, the process proceeds to S460, and the received manufacturing number is updated and stored as the manufacturing number of the injector 10 having the node ID “X”. . In the ECU 20, the serial number of each injector 10 is stored in a data rewritable nonvolatile memory such as an EEPROM provided in the ECU 20.

  In the next S470, the characteristic value in the EEPROM 13 is read from the injector 10 having the node ID “X”, and the read characteristic value is updated and stored as the characteristic value of the injector 10 having the node ID “X”. .

  More specifically, the microcomputer 23 of the ECU 20 causes the communication driver 21 to output a characteristic value request, which is destination designation communication data including “X” as a node ID, to the communication line LC. Then, in the injector 10 with the node ID “X”, the communication processing unit 16 reads the characteristic value of the injector 10 from the EEPROM 13, and transmits communication data including the characteristic value (hereinafter referred to as characteristic value communication data) to the communication driver 15. To the communication line LC. Then, when the characteristic value communication data is received by the communication driver 21, the microcomputer 23 of the ECU 20 converts the characteristic value included in the received characteristic value communication data into the characteristic relating to the injector 10 having the node ID “X”. Update and store as a value. Further, when the microcomputer 23 updates and stores the characteristic value of the injector 10 having the node ID “X”, the microcomputer 23 re-creates the control map described above using the new characteristic value.

  That is, if it is determined in S450 that the two manufacturing numbers do not match, it is considered that the injector 10 with the node ID “X” has been replaced. The characteristic value is used for controlling the injector 10 having the node ID “X”.

Then, when the process of S470 is completed, the process proceeds to S480.
In S480, it is determined whether or not “X” is 4. If not, the process returns to S420.
If it is determined in S480 that “X” is 4, it means that the processing of S430 to S470 has been performed for all the injectors 10 having node IDs 1 to 4. In that case, the matching process is terminated.

  Next, FIG. 4B is a flowchart showing a request response process that is performed in each injector 10 to respond to the verification request from the ECU 20. The request response process is performed by the communication processing unit 16.

  As shown in FIG. 4B, in the request response process, first, in S510, it is determined whether or not a verification request from the ECU 20 has been received by the communication driver 21. When a collation request is received, the process proceeds to S520.

  In S520, it is determined whether or not the node ID included in the received verification request matches the node ID of the injector 10, and if both node IDs do not match, the received verification request is discarded, The process returns to S510. This is because the verification request is not addressed to you.

  If it is determined in S520 that the two node IDs match, the received collation request is destined for the injector 10, so the process proceeds to S530 and the serial number is read from the EEPROM 13. At the same time as reading, production number communication data which is communication data including the production number is created, and the production number communication data is output from the communication driver 15 to the communication line LC in S540. Then, the process returns to S510.

Next, the effect | action by the process of FIG. 4 is demonstrated using FIG. 5 again.
First, as shown to (7-1) in FIG. 5, the collation request | requirement with respect to the injector (# 1) 10 of node ID "1" is transmitted from ECU20 (S430 when X = 1).

  Then, as indicated by (8-1) in FIG. 5, only the injector (# 1) 10 having the node ID “1” returns the manufacturing number in the EEPROM 13 to the ECU 20 (S530, S540).

  Then, as shown in (9-1) in FIG. 5, the ECU 20 receives the manufacturing number from the injector (# 1) 10 (S440), the received manufacturing number, and the injector ( # 1) Compare with the serial number of 10 and if both serial numbers match (S450: YES), the verification of the serial numbers related to the injector (# 1) is completed.

  And also about each injector 10 of # 2- # 4, (7-2)-(9-2), (7-3)-(9-3), (7-4)-(9-) in FIG. As shown in each of 4), operations similar to the above (7-1) to (9-1) are performed.

  In addition, (7-1)-(9-4) in FIG. 5 shows a case where the injector 10 is not replaced between the time when the ECU 20 assigns the node ID to each injector 10 last time and the time when it is given this time. ing. In contrast, for example, if the injector (# 1) 10 has been replaced, the characteristic value request is transmitted from the ECU 20 to the injector (# 1) 10 in (9-1) in FIG. The injector (# 1) returns the characteristic value in the EEPROM 13 to the ECU 20, and the characteristic value is updated and stored in the ECU 20 as the characteristic value related to the injector (# 1) (S470).

  As described above, in the fuel injection control system 1 of the reference example, the ECU 20 sets the voltage of the sensor line LS of each injector 10 to the ground voltage only for the time corresponding to the node ID applied to the injector 10. Each injector 10 measures the duration (low time) during which the voltage of the sensor line LS connected to itself is the ground voltage, and identifies the node ID assigned to the injector 10 by the ECU 20 from the measured value. Then, the identified node ID is stored as its own node ID.

  For this reason, after the physical connection of the injector 10 to the ECU 20 is completed, the ECU 20 can assign a node ID to each injector 10. Therefore, when the injector 10 is manufactured, there is no need to set an invariable node ID for the injector 10, and the above-described problems caused by incorrect connection of the vehicle parts (in this example, the injector 10) can be prevented.

  Moreover, in order to notify node ID from ECU20 to each injector 10, since sensor line LS for every injector 10 is used, node ID can be reliably provided to each injector 10, and node ID is provided. It does not take time. In particular, since the ECU 20 simultaneously sets the sensor lines LS to the ground voltage, the ECU 20 can notify the injectors 10 of node IDs in parallel, and the time required to assign node IDs to all the injectors 10. Can be shortened.

In the above reference example, the injector 10 corresponds to a vehicle part, and the communication processing unit 16 corresponds to a communication control unit.
On the other hand, in the process of FIG. 3A, the voltage value for fixing the voltage of the sensor line LS to give the node ID to each injector 10 is other than the ground voltage if it is outside the normal voltage range of the sensor signal. Voltage may be used.

For example, in the process of FIG. 3A, the digital signal indicating the node ID may be sent to each injector 10 by alternately changing the voltage of each sensor line LS between 0V and 5V. In this case, the digital signal corresponds to the ID instruction signal, and each injector 10 may specify the node ID given to itself based on the digital value obtained from the signal of the sensor line LS.
[Example]
Next, examples of the present invention will be described, but the description of the same matters as in the reference example will be omitted.

Compared with the reference example, the fuel injection control system 1 of the embodiment first differs in the configuration of the ECU 20 and the injector 10 as shown in FIG.
As shown in FIG. 6, since the state switching circuit 25 is unnecessary in the ECU 20 of this embodiment, the state switching circuit 25 is not provided.

  Further, the injector 10 is not provided with the edge determination circuit 17, and instead, the communication processing unit 16 of each injector 10 is provided with a voltage output circuit 16 a and an output switching circuit 16 b.

  The voltage output circuit 16a is a circuit that alternatively outputs a plurality of voltages equal to or greater than the number of injectors 10 connected to the ECU 20. In this embodiment, any one of 1V, 2V, 3V, and 4V is output. Switch to output. For example, such a voltage output circuit 16a includes a plurality of series voltage dividing resistors that divide a power supply voltage (5V) to generate each of 1V, 2V, 3V, and 4V, and any one of the voltages. A switching circuit (selector) that switches and outputs one can be used.

The output switching circuit 16b outputs either the sensor signal output from the sensor 11 or the voltage output from the voltage output circuit 16a to the sensor line LS.
Further, in this embodiment, the EEPROM 13 of each injector 10 stores a temporary ID in addition to the above-described characteristic value and manufacturing number.

  The temporary ID is a temporary node ID until the setting of the node ID is completed in the injector 10, and any one of 1V, 2V, 3V, and 4V is detected by the voltage output circuit 16a and the output switching circuit 16b as a sensor line. It is also information indicating whether to output to the LS. In this embodiment, the temporary ID “1” indicates 1V, the temporary ID “2” indicates 2V, the temporary ID “3” indicates 3V, and the temporary ID “4” indicates 4V. In addition, in the manufacturing factory of the injector 10, the initial value (any one of 1 to 4) of the temporary ID is also stored in the EEPROM 13 of each injector 10.

  In the injector 10, the completion of the node ID setting means that the node ID given from the ECU 20 is completely written in the node ID storage unit. In the following, the node ID given to the injector 10 from the ECU 20 and written in the node ID storage unit of the injector 10 is also referred to as the main ID with respect to the temporary ID.

  Next, the microcomputer 23 of the ECU 20 executes the ID assigning process of FIG. 7A instead of the ID assigning process of FIG. Each injector 10 performs the ID setting process of FIG. 7B instead of the ID setting process of FIG.

  First, as shown in FIG. 7A, when the microcomputer 23 of the ECU 20 starts executing the ID assigning process, the voltage corresponding to the temporary ID (that is, the temporary ID) is applied to all the injectors 10 in the first S910. A voltage output command (corresponding to communication data for the initial voltage output command) for causing the sensor line LS to output the voltage indicated by ID is output from the communication driver 21 to the communication line LC. The voltage output command is not destination designation communication data but broadcast communication data destined for all injectors 10.

  Then, in the next S920, the injector 10 receives a command output from the ECU 20 to the communication line LC and waits until a predetermined time which is considered to output a voltage different from the sensor signal to the sensor line LS elapses. When the predetermined time has elapsed, in next S930, the voltage values of all the sensor lines LS are acquired and stored by the A / D converter 23a.

  Next, in S940, the sensor line LS is unique among the injectors 10 that have not yet been given a node ID (main ID) since the start of the ID assignment process (hereinafter referred to as an injector 10 to which no real ID has been assigned). It is determined from the voltage value stored in S930 whether there is any output voltage (in other words, the voltage output to the sensor line LS is unique).

  In S930, a voltage value may be acquired and stored only for the sensor line LS connected to the injector 10 to which this ID is not assigned. Further, when the determination of S940 is performed for the first time after starting the ID assigning process, all four injectors 10 are the injectors 10 to which no real ID is assigned.

  If any of the injectors 10 to which the real ID is not assigned has a unique voltage output to the sensor line LS, the process proceeds to S950, where the unique voltage is output to the sensor line LS. An ID confirmation command (corresponding to ID assignment communication data) for assigning a node ID to the injector 10 to which no ID is assigned is output from the communication driver 21 to the communication line LC.

  This ID confirmation command includes a node ID (main ID) to be given to the injector 10 that is the transmission destination of the ID confirmation command, and a temporary value indicating the voltage value that the transmission destination injector 10 outputs to the sensor line LS. Communication data including an ID (corresponding to voltage value information) and not destination designation communication data including a node ID, but communication data indicating a destination (transmission destination) by the included temporary ID. In addition, the injector 10 to which this ID confirmation command is transmitted has been given a node ID by the ECU 20, and is no longer an injector 10 to which this ID has not been assigned.

  Also in this embodiment, the node ID “1” is assigned to the injector 10 of # 1, the node ID “2” is assigned to the injector 10 of # 2, and the node ID “2” is assigned to the injector 10 of # 3. 3 ”, and the node ID“ 4 ”is assigned to the injector 10 of # 4.

  Then, in next S960, it is determined whether or not there is an injector 10 to which no real ID is assigned. If there is no injector 10 to which no real ID is assigned (that is, if node IDs are assigned to all injectors 10). , The process proceeds to S980, and a voltage output stop command (corresponding to communication data for voltage output stop command) for stopping outputting a voltage different from the sensor signal to the sensor line LS to all of the injectors 10 The communication driver 21 outputs the data to the communication line LC, and then ends the ID assignment process. The voltage output stop command is also broadcast communication data destined for all the injectors 10 in the same manner as the voltage output command.

  If it is determined in S960 that there is an injector 10 with no real ID assigned, the process proceeds to S970, where a random number generation command is output from the communication driver 21 to the communication line LC, and then the process returns to S920. The random number generation command causes the injector 10 to randomly select one voltage value from the above-described 1V, 2V, 3V, and 4V, and use the selected voltage value as a sensor signal on the sensor line LS. Instead, it is communication data to be output (corresponding to communication data for selection voltage output command), and is broadcast communication data destined for all the injectors 10.

  Further, the random number generation instruction includes a confirmed provisional ID. The confirmed provisional ID is information (corresponding to selection exclusion value information) that can specify the value of the voltage output to the sensor line LS by the injector 10 that has already been given the node ID since the start of the ID assignment process. Yes, it is a temporary ID that has been included in the ID confirmation command output to the communication line LC in S950 after starting the ID assigning process.

Next, FIG. 7B is a flowchart showing an ID setting process performed in each injector 10. The ID setting process is performed by the communication processing unit 16.
As shown in FIG. 7B, in the ID setting process, first, in S1010, it is determined whether or not the communication driver 21 has received a voltage output command from the ECU 20. If the voltage output command is received, the process proceeds to the next S1020.

  In S1020, the output switching circuit 16b is switched to output the voltage from the voltage output circuit 16a to the sensor line (#n) LS, and the voltage output circuit 16a corresponds to the temporary ID of the injector (#n) 10 By outputting the voltage, the voltage corresponding to the temporary ID is output to the sensor line (#n) LS instead of the sensor signal. Specifically, if the temporary ID is “1”, 1V, if the temporary ID is “2”, 2V, if the temporary ID is “3”, 3V, if the temporary ID is “4”, 4V, Output to line (#n) LS. As described above, the temporary ID is stored in the EEPROM 13 of the injector (#n) 10.

  Next, in S1030, it is determined whether or not the communication driver 21 has received the ID confirmation command from the ECU 20. If the ID confirmation command has not been received, the process proceeds to S1060, but if the ID confirmation command has been received. The process proceeds to S1040.

  In S1040, the temporary ID included in the received ID confirmation command is compared with the temporary ID of the injector (#n) 10 to determine whether or not the temporary IDs match. If the temporary IDs do not match, the received ID confirmation command is discarded and the process proceeds to S1060.

  If it is determined in S1040 that the two temporary IDs match, it is determined that the received ID confirmation command is for the injector (#n) 10 and the process proceeds to S1050. The node ID included in the received ID confirmation command is written (stored) in the node ID storage unit as the node ID of the injector (#n) 10. Thereby, the setting of the node ID in the injector (#n) 10 is completed. Then, the process proceeds to S1060.

  In S1060, it is determined whether or not the communication driver 21 has received a random number generation command from the ECU 20. If a random number generation command has not been received, the process proceeds to S1100 as it is, but if a random number generation command has been received, the process proceeds to S1070.

  In S1070, it is determined whether or not the node ID has been set in the injector (#n) (the node ID has already been set). If the node ID has been set, the received random number is determined. The generated instruction is discarded and the process proceeds to S1100.

If it is determined in S1070 that the node ID setting has not been completed (the node ID has not been set), the process proceeds to S1080 to perform a random number generation process.
Random number generation processing includes 1 V, 2 V, 3 V, and 4 V voltage values obtained by removing the voltage value corresponding to the confirmed provisional ID included in the received random number generation command. This is a process for selecting one voltage value at random, and in this embodiment, the value of the temporary ID is equal to the voltage value, so that it is included in the received random number generation command among the temporary IDs of 1-4. One temporary ID is randomly selected from the temporary IDs excluding the confirmed temporary ID.

  Specifically, as shown in FIG. 8, in the random number generation process, first, in S1210, for example, a communication time that is an elapsed time from the reception of a voltage output command from the ECU 20 is acquired from a timer. The timer is provided in the communication processing unit 16. The communication time acquired from the timer is an integer.

  In the next step S1220, the communication time acquired from the timer is divided by the number of cylinders (= 4: the total number of temporary IDs and the number of types of voltages output to the sensor line LS instead of the sensor signal). The remainder (any one of 0 to 3) is set as a random number, and a value obtained by adding 1 to the random number (any one of 1 to 4) is changed to a random number in the next S1230.

  Next, in S1240, it is determined whether or not the same value as the random number obtained in S1230 is in the confirmed temporary ID included in the random number generation command received from the ECU 20, and the random number obtained in S1230. If the same value is found in the confirmed provisional ID, the process returns to S1210 to generate the random number again.

  If it is determined in S1240 that the same value as the random number obtained in S1230 is not in the confirmed temporary ID, the random number obtained in S1230 is set as the finally generated random number, and the random number generation is performed. The process ends.

  Returning to FIG. 7B, if a random number is generated by the random number generation process, the process proceeds to S1090. In S1090, the random number generated by the random number generation process is updated and stored in the EEPROM 13 as a temporary ID, and then the process proceeds to S1100.

  In S1100, it is determined whether or not the communication driver 21 has received a voltage output stop command from the ECU 20. If the voltage output stop command has not been received, the process returns to S1020. Then, in S1020, a voltage corresponding to the temporary ID having the same value as the random number generated in S1080 random number generation processing (FIG. 8) is output to the sensor line (#n) LS instead of the sensor signal. .

  On the other hand, if it is determined in S1100 that a voltage output stop command from the ECU 20 has been received, the process proceeds to S1110. In step S1110, the output switching circuit 16b is switched so that the sensor signal from the pressure sensor 11 is output to the sensor line (#n) LS. As a result, the sensor signal (#n) LS enters a normal state in which the sensor signal appears. Then, the process returns to S1010 and waits for a voltage output command from the ECU 20.

  If the ID assigning process in FIG. 7A is performed every time the ECU 20 is activated, the ECU 20 is activated again when the process of S1110 in FIG. 7B is performed on the injector 10 side. Up to this point, since it is not necessary to perform the determination process of S1010, the determination process of S1010 can be paused (the process itself in FIG. 7B can be paused after all).

Next, the effect | action by the process of FIG. 7 is demonstrated using FIG. In FIG. 9, setting the node ID in the injector 10 is described as “main ID determination”, and the completion of the node ID setting is described as “ID confirmed”.
<Operation a> First, as shown in (1) in FIG. 9, a voltage output command is transmitted from the ECU 20 to all the injectors 10 (S910).
<Operation b> Then, the voltage output command is received by the communication driver 15 of each injector 10 (S1010: YES). Then, as shown in (2) in FIG. 9, each injector (#n) 10 outputs a voltage corresponding to the temporary ID stored in its own EEPROM 13 to the sensor line (#n) LS (S1020). ).

In the example of FIG. 9, when the voltage output command is transmitted from the ECU 20, the temporary ID of the injector (# 1) 10 is “1” and the temporary ID of the injector (# 3) 10 is “2”. In this example, the temporary IDs of the injector (# 2) 10 and the injector (# 4) 10 are both “3”. For this reason, at the time (2) in FIG. 9, the voltage VS (# 1) of the sensor line (# 1) and the voltage VS (# 3) of the sensor line (# 3) are respectively unique voltages (1 V and However, the voltage VS (# 2) of the sensor line (# 2) and the voltage VS (# 4) of the sensor line (# 4) are the same 3V.
<Operation c> On the other hand, the ECU 20 monitors the voltage of each sensor line LS as shown in (3) in FIG. 9 (S930). If there is an injector 10 with a unique voltage output to the sensor line LS (S940: YES), each injector 10 outputting a unique voltage as shown in (4) in FIG. (In the example of FIG. 9, an ID confirmation command for assigning a node ID is transmitted to the injectors # 1 and # 3) (S950).

As described above, in the ID confirmation command, the temporary ID indicating the value of the voltage output from the injector 10 to the sensor line LS is provided together with the node ID given to the injector 10 as the transmission destination. Therefore, each injector 10 determines whether or not the received ID confirmation command is addressed to itself depending on whether or not the temporary ID included in the received ID confirmation command is the same as its own temporary ID. Can be determined. In the example of FIG. 9, in (4) of FIG. 9, the ECU 20 issues an ID confirmation command including the temporary ID “1” and the node ID “1” as the ID confirmation command for the injector (# 1) 10. The ID confirmation command including the temporary ID “2” and the node ID “3” is transmitted as the ID confirmation command for the injector (# 3) 10.
<Operation d> The ID confirmation command from the ECU 20 is received by the communication driver 15 of each injector 10 (S1030: YES). Then, as shown in (5) in FIG. 9, each injector (#n) 10 compares the temporary ID included in the received ID confirmation command with its own temporary ID (S1040). .

  In the injector 10 in which the output voltage to the sensor line LS is not unique (in the example of FIG. 9, the injectors # 2 and # 4), the temporary ID in the ID confirmation command received from the ECU 20 and the self Therefore, the received ID confirmation command is discarded (S1040: NO).

  On the other hand, in the injector 10 in which the output voltage to the sensor line LS is unique (injector 10 of # 1 or # 3 in the example of FIG. 9), the temporary ID in the ID confirmation command received from the ECU 20 Therefore, the node ID in the ID confirmation command in which both the temporary IDs match is set as the node ID (S1050). Therefore, the node ID is assigned from the ECU 20 only for the injector 10 in which the output voltage to the sensor line LS is unique, and the node ID is set. In the example of FIG. 9, the node ID “1” is set for the injector (# 1) 10 and the node ID “3” is set for the injector (# 3) 10 in (5) of FIG. .

  For this reason, if the voltages of all the sensor lines LS are all different in the <operation c> stage, the operations described in the <operation c> and <operation d> are performed on all the injectors 10. The assignment and setting of the node ID is completed, and the ECU 20 transmits a voltage output stop command without transmitting a random number generation command (S960: NO → S980). Each injector 10 receives the voltage output stop command (S1100: YES), stops outputting the voltage corresponding to the temporary ID to the sensor line LS, and outputs the sensor signal to the sensor line LS. (S1110).

Further, when there is an injector 10 whose output voltage to the sensor line LS is not unique at the stage of <operation c>, that is, there is one injector 10 whose output voltage to the sensor line LS is unique. If not (specifically, the ECU 20 determines “NO” in the first S940 after the start of the ID assignment process in FIG. 7A), or the output voltage to the sensor line LS Is the only one of the injectors 10 (specifically, "YES" is determined in the ECU 20 in the first S940 after the ID assigning process in FIG. 7A is started). If it is determined, but if “YES” is determined in S960), the following <operation e> to <operation are performed until node ID assignment and setting for all the injectors 10 are completed. Operation of h> is repeated.
<Operation e> First, as shown in (6) in FIG. 9, a random number generation command is transmitted from the ECU 20 to all the injectors 10 (S970). Note that the random number generation command includes the above-described confirmed provisional ID.
<Operation f> The random number generation command from the ECU 20 is received by the communication driver 15 of each injector 10 (S1060: YES).

Then, as shown in (7) in FIG. 9, each injector (#n) 10 determines whether or not the node ID has been set (ID confirmed) (S1070).
Then, in the injector 10 with the node ID already set (injector 10 of # 1 and # 3 in the example of FIG. 9), the received random number generation command is discarded (S1070: YES) and output to the sensor line LS. The voltage does not change.

  In addition, random number generation processing (S1080) is performed in the injector 10 in which the node ID has not been set (injector 10 of # 2 and # 4 in the example of FIG. 9), and is included in the random number generation command received from the ECU 20. Other than the confirmed temporary ID, a random number that becomes a new temporary ID is generated. Specifically, among the temporary IDs 1 to 4, one temporary ID is randomly selected from the temporary IDs excluding the confirmed temporary ID included in the received random number generation command. The temporary ID is updated and stored in the EEPROM 13 as its own temporary ID (S1090). Then, the voltage corresponding to the updated temporary ID (new temporary ID) is output to the sensor line LS (S1020).

In addition, in (7) in FIG. 9, since the new temporary ID of the injector (# 2) 10 is 4, the voltage VS (# 2) of the sensor line (# 2) LS is changed from 3V to 4V, Since the new temporary ID of the injector (# 4) 10 is 3 as before, the voltage VS (# 4) of the sensor line (# 4) LS continues to be 3V.
<Operation g> On the other hand, after transmitting the random number generation command, the ECU 20 again monitors the voltage of each sensor line LS as shown in (8) in FIG. 9 (S930). Among the injectors 10 to which this ID is not assigned (injectors 10 that have not yet been assigned a node ID and have not yet been set with a node ID), the output voltage to the sensor line LS is unique. If there is 10 (S940: YES), as shown in (9) in FIG. 9, ID confirmation for assigning a node ID to each unassigned injector 10 outputting a unique voltage is confirmed. An instruction is transmitted (S950).

In the example of FIG. 9, each of the injectors # 2 and # 4 is an injector 10 to which this ID has not been assigned, and each injector 10 outputs a unique voltage. Thus, an ID confirmation command is transmitted for each. Specifically, in (9) of FIG. 9, the ECU 20 transmits an ID confirmation command including the temporary ID “4” and the node ID “2” as an ID confirmation command to the injector (# 2) 10, and the injector (# 4) As the ID confirmation command for 10, an ID confirmation command including the temporary ID “3” and the node ID “4” is transmitted.
<Operation h> The ID confirmation command from the ECU 20 is received by the communication driver 15 of each injector 10 (S1030: YES). Then, as in the case of <Operation d> above, each injector (#n) 10 compares the temporary ID included in the received ID confirmation command with its own temporary ID (S1040). .

  Then, as shown in (10) in FIG. 9, in the injector 10 to which the output voltage to the sensor line LS is unique and this ID is not assigned (in the example of FIG. 9, # 2 or # 4 injector 10), The temporary ID in the ID confirmation command received from the ECU 20 matches the temporary ID of itself (S1040: YES), and the node ID in the ID confirmation command in which both the temporary IDs match is set as its own node ID. It will be set (S1050). In the example of FIG. 9, the node ID “2” is set for the injector (# 2) 10 and the node ID “4” is set for the injector (# 4) 10 in (10) of FIG. .

Further, in the injector 10 whose output voltage to the sensor line LS is not unique, the received ID confirmation command is discarded (S1040: NO).
Then, the above operations <operation e> to <operation h> are repeated until node ID assignment and setting for all the injectors 10 are completed. In the example of FIG. 9, the assignment and setting of node IDs to all the injectors 10 are completed at the time (10) in FIG.

  Further, when the assignment and setting of the node IDs for all the injectors 10 are completed by the above operation, as shown in (11) in FIG. 9, the ECU 20 transmits a voltage output stop command (S960: NO → S980). .

  Then, as shown in (12) in FIG. 9, each injector 10 receives the voltage output stop command (S1100: YES), stops outputting the voltage corresponding to the temporary ID to the sensor line LS, A normal state in which a sensor signal is output to the sensor line LS is set (S1110).

  Also in the present embodiment, the ECU 20 and each injector 10 perform the above-described processing of FIG. 4 (processing for checking the serial number of the injector 10) following the processing of FIG.

  Even with the fuel injection control system 1 of the embodiment as described above, the ECU 20 can assign a node ID to each injector 10 after the physical connection of the injector 10 to the ECU 20 is completed. Therefore, when the injector 10 is manufactured, there is no need to set an invariant node ID for the injector 10, and the above-described malfunction due to a wrong connection of the vehicle parts (in this example, the injector 10) can be prevented.

  Further, according to the present embodiment, the state switching circuit 25 for forcibly changing the voltage of each sensor line LS is not required on the ECU 20 side. For this reason, a microcomputer for controlling the state switching circuit 25 is further provided. This is advantageous in that the number of 20 ports can be reduced.

  On the other hand, when the ID assignment process of FIG. 7A is performed for the first time after the physical connection of the injector 10 to the ECU 20 is completed, the temporary ID stored in the EEPROM 13 of each injector 10 is manufactured. Since each of the injectors 10 receives a voltage output command from the ECU 20 at the stage of <operation b>, the injector 10 outputs a voltage corresponding to the temporary ID of the initial value to the sensor line LS. It becomes. Therefore, in that case, there may be an injector 10 that outputs the same voltage to the sensor line LS at the stage of <operation c>. For this reason, the operations of <operation e> to <operation h> are performed. There is a possibility that the operation will be performed.

  On the other hand, when the ID assignment process of FIG. 7A is performed for the second time or later in the ECU 20 after the physical connection of the injector 10 to the ECU 20 is completed, the EEPROM 13 of each injector 10 includes the past. 7, different values are stored as temporary IDs. Therefore, in the stage of <operation b>, each injector 10 outputs a different voltage to the sensor line LS. It becomes. Therefore, in this case, all the sensor lines LS have different voltages in the <operation c> stage, and eventually, the operations <operation e> to <operation h> are not performed. The assignment and setting of the node IDs for all the injectors 10 are completed by only the operations a> to <operation d>. That is, the operations (6) to (10) in FIG. 9 are necessarily omitted.

  For this reason, at the time of the second and subsequent node ID assignments to the same injector 10 that has not been exchanged, the time required to assign and set the node ID to each injector 10 can be shortened.

  In this embodiment, on the ECU 20 side, S910 in FIG. 7A corresponds to the processing as the initial voltage output command means, and S970 in FIG. 7A is the processing as the selection voltage output command means. Correspondingly, S930 to S950 in FIG. 7A correspond to processing as an ID assigning means.

  On the injector 10 side, the EEPROM 13 corresponds to voltage value storage means, and S1030 to S1050 in FIG. 7B corresponds to processing as ID setting means, and S1060 to S1110 and S1020 in FIG. 7B. Corresponds to processing as voltage output means.

  Then, on the ECU 20 side, after the ID assigning process of FIG. 7A is started, the operation in the case where “YES” is determined in the first S940 and “NO” is determined in S960 in that time, “The electronic control unit activates the initial voltage output command means (S910) when the specific timing at which the node ID is to be given to the vehicle part arrives, and the ID assignment means (S930 to S950) assigns the node ID to all the vehicle parts. If it is given (S960: NO), this corresponds to the operation of outputting the voltage output stop command communication data to the communication line without operating the selection voltage output command means (S970) (S980).

  Further, on the ECU 20 side, when “NO” is determined in the first S940 after the ID assigning process in FIG. 7A is started, or “YES” is determined in the first S940, The operation in the case where “YES” is determined in S960 of that time is “the electronic control device operates the initial voltage output command means (S910) when the specific timing at which the node ID is to be given to the vehicle component comes, If there is a vehicle part for which the ID assigning means (S930 to S950) did not assign the node ID, the selection voltage is applied until the ID assigning means assigns the node ID to all of the vehicle parts (S960: until NO). If the output command means (S970) is operated repeatedly and the ID assigning means assigns the node ID to all the vehicle parts (S960: NO), the voltage output stop command communication And it outputs the over data to the communication line (S980) "corresponds to the operation.

  On the other hand, the type of voltage output from the injector 10 to the sensor line LS instead of the sensor signal may be larger than the number of injectors 10 connected to the ECU 20, but is the same as the number of injectors 10 (4 in this embodiment). By doing so, the probability that the voltage of each sensor line LS becomes unique can be increased, and the node ID can be assigned to each injector 10 most efficiently.

The pressure sensor 11 includes a sensor body that detects fuel pressure, and a sensor control circuit that performs gain adjustment of the sensor body and offset adjustment of an output signal of the sensor body. The signal after offset adjustment according to (1) may be output to the sensor line LS as a sensor signal.
[Modification]
The processing of FIG. 7 can be modified as shown in FIG.

  First, as shown in FIG. 10A, S910 is deleted in the ID assigning process on the ECU 20 side. When the ID assignment process is started, first, in S970, a random number generation command is output from the communication driver 21 to the communication line LC, and then the process returns to S920.

  Further, as shown in FIG. 10B, in the ID setting process on the injector 10 side, it is determined whether or not the communication driver 21 has received a random number generation command from the ECU 20 in S1015 instead of the first S1010. If a random number generation command is received, the process proceeds to S1070.

  Furthermore, in this modification, it is not necessary to store the initial value of the temporary ID in the EEPROM 13 of each injector 10 in the manufacturing factory of the injector 10. This is because the initial value of the temporary ID is not used in the ID setting process of FIG. 10B because the process proceeds from S1015 to S1070.

And according to such a modification, it becomes the following operation | movement.
First, a random number generation command is transmitted from the ECU 20 to all the injectors 10 (S970). This is different from the previous embodiment.

  The random number generation command is received by the communication driver 15 of each injector 10 (S1015: YES), and each injector 10 determines whether or not the node ID has been set (S1070). Then, the node ID is not set in all the injectors 10. The random number generation command received at this time does not include the confirmed temporary ID.

  For this reason, each of all the injectors 10 randomly selects one temporary ID from the temporary IDs 1 to 4 by random number generation processing (S1080), and updates and stores the selected temporary ID in the EEPROM 13. At the same time (S1090), a voltage corresponding to the updated temporary ID is output to the sensor line LS (S1020).

  On the other hand, the ECU 20 monitors the voltage of each sensor line LS after transmitting the random number generation command (S930). If there is an injector 10 with a unique output voltage to the sensor line LS (S940: YES), an ID for giving a node ID to each injector 10 outputting that unique voltage A confirmation command is transmitted (S950).

  Then, in each injector 10, the operation of <operation d> described above is performed. As a result, only the injector 10 whose output voltage to the sensor line LS is unique is given a node ID from the ECU 20, and the node An ID is set.

  Thereafter, as in the above-described embodiment, the operations of <Operation e> to <Operation h> described above are repeated until the assignment and setting of the node IDs for all the injectors 10 are completed. When the assignment and setting of the node IDs to all the injectors 10 are completed, the ECU 20 transmits a voltage output stop command (S960: NO → S980), and each injector 10 receives the voltage output stop command ( S1100: YES), a normal state in which a sensor signal is output to the sensor line LS is entered (S1110).

  And also by such a modification, ECU20 can provide node ID to each injector 10 after the physical connection to ECU20 of the injector 10 is completed. However, in comparison with the above-described embodiment, since the ECU 20 transmits a random number generation command to the injector 10 from the beginning, after the physical connection of the injector 10 to the ECU 20 is completed, the ECU 20 in FIG. Even when the ID assigning process is performed after the second time, there is a high possibility that the ECU 20 has to transmit the random number generation command a plurality of times, which is inefficient.

On the other hand, in this modification, S1015, S1060 to S1110 and S1020 in FIG. 10B on the injector 10 side correspond to processing as voltage output means.
In this modified example, in the ID assigning process in FIG. 10A on the ECU 20 side, a random number generation command is repeatedly transmitted in S970 until “NO” is determined in S960. When the specific timing at which the node ID is to be assigned to the vehicle part has arrived, the apparatus selects the selected voltage output command means (S970) until the ID assigning means assigns the node ID to all of the vehicle parts (S960: until NO). Corresponds to the operation of repeatedly operating.

  As mentioned above, although one Example of this invention was described, this invention is not limited to such Example at all, Of course, in the range which does not deviate from the summary of this invention, it can implement in a various aspect. .

  For example, the vehicle component connected to the electronic control device may be other than the injector 10. Similarly, the sensor built in the vehicle component may be a sensor other than the pressure sensor 11.

  DESCRIPTION OF SYMBOLS 1 ... Fuel injection control system, 10 ... Injector (vehicle parts), 11 ... Pressure sensor, 13 ... EEPROM, 15 ... Communication driver, 16 ... Communication processing part, 16a ... Voltage output circuit, 16b ... Output switching circuit, 17 ... Edge Discriminating circuit, 20 ... ECU (electronic control unit), 21 ... communication driver, 23 ... microcomputer, 23a ... A / D converter, 25 ... state switching circuit, 25a ... transistor, 30 ... EDU (electronic drive unit), LC ... Communication line, LS ... sensor line (signal line for sensor signal)

Claims (2)

A plurality of vehicle parts incorporating sensors and communication devices;
A bus connection is established via a common communication line with the communication device of each vehicle component, communication is possible with each vehicle component via the communication line, and a sensor signal which is an output signal of the sensor is transmitted. An electronic control unit connected to each of the vehicle parts via a signal line provided for each of the vehicle parts,
Each vehicle component is
The communication device receives communication data which is output to the communication line with any one of the plurality of vehicle parts as a destination, and includes communication data including a node ID indicating the destination vehicle part. Then, a determination process is performed to determine whether or not the node ID included in the received communication data matches the node ID of the vehicle part. If the node IDs match, the received communication is performed. A vehicle control system including a communication control unit that performs processing based on data and discards the received communication data when the node IDs do not match.
The electronic control device
As means for giving a node ID to each vehicle part,
For all of the vehicle parts, one voltage value is randomly selected from a plurality of voltage values equal to or greater than the number of the vehicle parts, and the voltage of the selected voltage value is applied to the signal line on the sensor. Selection voltage output command means for outputting communication data for selection voltage output command to be output instead of a signal to the communication line;
The selection voltage output command means operates every time the selection voltage output command communication data is output to the communication line, and corresponds to at least the vehicle component to which no node ID has been assigned yet. If there is a vehicle part in which the voltage output to the signal line is unique among the vehicle parts that have not been assigned a node ID yet, the unique voltage is monitored. As a process for assigning a node ID to a vehicle part that is outputting, a node ID to be given to the vehicle part and voltage value information indicating a voltage value that the vehicle part is outputting to the signal line are included. ID providing means for performing processing for outputting the communication data for providing ID to the communication line,
Each vehicle component is
Voltage value storage means for storing one of the plurality of voltage values;
Each time the communication device receives the selection voltage output command communication data, it is determined whether or not a node ID has been set in the vehicle part. If the node ID has been set, the received While discarding the communication data for the selected voltage output command, if the node ID has not been set, one voltage value is randomly selected from the plurality of voltage values, and the voltage of the selected voltage value is A voltage output means for outputting to the signal line connecting the vehicle component and the electronic control unit, and for updating and storing the selected voltage value in the voltage value storage means;
When the communication device receives the ID assignment communication data, the voltage value indicated by the voltage value information included in the received ID assignment communication data and the voltage value stored in the voltage value storage means If the two voltage values do not match, the received ID assignment communication data is discarded. On the other hand, if the two voltage values match, the received ID assignment communication data is discarded. ID setting means for performing a process of setting a node ID included in the node ID of the vehicle part used in the determination process,
Further, the selection voltage output command means of the electronic control device includes:
The selection voltage output command communication data includes selection exclusion value information capable of specifying the value of the voltage output to the signal line by the vehicle part to which the ID assigning unit has already assigned the node ID. And
The voltage output means of each vehicle component is
When selecting one voltage value from among the plurality of voltage values, the voltage value specified by the selection exclusion value information included in the received selection voltage output command communication data among the plurality of voltage values. One voltage value is selected randomly from the voltage values excluding the voltage value to be
The electronic control device
When a specific timing at which a node ID is to be assigned to the vehicle part has arrived, the selection voltage output command means is repeatedly operated until the ID assignment means assigns a node ID to all of the vehicle parts. If node IDs are assigned to all of the vehicle parts, communication data for voltage output stop command for stopping output of a voltage different from the sensor signal to the signal lines for all of the vehicle parts. Is output to the communication line,
The voltage output means of each vehicle component is
When the communication device receives the voltage output stop command communication data, the output of the voltage to the signal line is stopped so that the sensor signal is output to the signal line;
A vehicle control system. The vehicle control system according to claim 1,
The voltage value storage means of each vehicle component is a nonvolatile memory capable of rewriting data,
The voltage value storage means stores any one of the plurality of voltage values as an initial value when the vehicle part is manufactured, and the ID setting means of the vehicle part uses a node ID of the vehicle part. Is set, the voltage value stored at that time is stored as is,
The electronic control device
As means for giving a node ID to each vehicle part,
Communication data for initial voltage output command for causing the signal line to output the voltage of the voltage value stored in the voltage value storage means instead of the sensor signal for all of the vehicle parts. Further comprising an initial voltage output command means for outputting to
The ID assigning means of the electronic control device is
The initial voltage output command means operates after outputting the initial voltage output command communication data to the communication line, monitors the voltage of each signal line, and the voltage output to the signal line is unique. If there is a vehicle part, the node ID assigned to the vehicle part and the vehicle part are output to the signal line as a process of assigning the node ID to the vehicle part outputting the unique voltage. Performing the process of outputting the ID giving communication data including the voltage value information indicating the value of the voltage to the communication line;
The voltage output means of each vehicle component is
When the communication device receives the initial voltage output command communication data, the voltage of the voltage value stored in the voltage value storage means is connected to the signal line connecting the vehicle component and the electronic control unit. Output,
The electronic control device
When a specific timing for giving a node ID to the vehicle part arrives, the initial voltage output command means is activated, and when the ID assignment means assigns a node ID to all of the vehicle parts, the selection voltage output If there is the vehicle part that outputs the voltage output stop command communication data to the communication line without operating the command means, and the ID assigning means does not assign the node ID, the ID assigning means The selection voltage output command means is repeatedly operated until a node ID is assigned to all of the vehicle parts. If the ID assignment means assigns a node ID to all of the vehicle parts, the voltage output stop command is used. Outputting communication data to the communication line;
A vehicle control system.

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