JP5434813B2 - Vehicle control system - Google Patents

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 claim 1, the electronic control device includes an ID assigning unit, and each vehicle component includes an ID setting unit.
Then, the ID assigning means of the electronic control device is activated when a specific timing at which a node ID is to be given to the vehicle parts arrives, and instructs all the vehicle parts to sweep the voltage of the signal line from the specific start voltage. After outputting the sweep instruction communication data to the communication line, the voltage of each signal line is monitored, and the voltage of each signal line corresponds to the node ID given to the vehicle component connected to the signal line Is reached, the voltage of the signal line is forcibly changed to a specific end voltage.

  Further, when the communication device receives the sweep command communication data, the ID setting means for each vehicle component sweeps the voltage of the signal line connecting the vehicle component and the electronic control device from the start voltage, and the signal line When the voltage of the signal line is monitored and it is detected that the voltage of the signal line has been changed to the end voltage by the ID providing means, the voltage of the signal line immediately before the change to the end voltage (hereinafter referred to as the voltage immediately before the change) The node ID assigned to the vehicle part by the ID assigning means is specified, and the specified node ID is set as the node ID of the vehicle part used in the determination process.

  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.

  Further, the “processing to set as a node ID” performed by the ID setting means is specifically processing to store the node ID in a node ID storage unit provided in the vehicle component. 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.

The sweep command communication data is communication data that does not designate a destination, and is communication data that is received and accepted by all vehicle parts.
The ID setting means is voltage-to-ID relation information indicating a correspondence relation between the voltage immediately before the change and the node ID, and has voltage-to-ID relation information having the same contents as the ID providing means. It should be. This is because the ID setting means can identify the node ID assigned by the electronic control device (ID assigning means) from the voltage immediately before change actually detected and the voltage-to-ID relationship information.

  According to the vehicle control system of claim 1, after the physical connection of the vehicle component to the electronic control device is completed, the electronic control device gives the node ID to each vehicle component. Will be 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.

  Further, in order to notify the node ID from the electronic control unit to each vehicle component, the signal line for the sensor signal is used, and the data communication by the communication line is not used, and the voltage sweep of each signal line is performed simultaneously. Thus, since the notification of the node ID for each vehicle part is performed in parallel, there is an advantage that it does not take time to assign the node ID to each vehicle part.

By the way, the start voltage and the end voltage are not limited to different values, and may be the same value.
Further, it is preferable that at least the start voltage of the start voltage and the end voltage is a ground line voltage (ground voltage = 0 V) as described in claim 2.

  Since the maximum width (dynamic range) for sweeping the signal line voltage can be increased, the difference in voltage immediately before change for each vehicle component can be increased, and the difference in voltage immediately before change for each vehicle component can be large. For example, the ID setting means for each vehicle part can easily identify the node ID assigned to the vehicle part from the voltage immediately before the change.

  Furthermore, if not only the start voltage but also the end voltage is the ground line voltage, the ID setting means of each vehicle component detects that the signal line voltage has been changed to the end voltage by the ID applying means. It is easy and advantageous. This is because the amount of change from the voltage during the sweep to the end voltage becomes large.

  Next, in the vehicle control system according to claim 3, in the vehicle control system according to claims 1 and 2, the inclination with which the ID setting means of each vehicle component sweeps the voltage of the signal line is the same for all vehicle components. is there. This configuration is advantageous because the configuration of all vehicle parts can be made exactly the same.

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 time chart for demonstrating the effect | action of an Example.

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 example is different in the configuration of the injector 10 as shown in FIG.
As shown in FIG. 6, the injector 10 includes an ID discrimination circuit 18 instead of the edge discrimination circuit 17 shown in FIG. The role of the ID discrimination circuit 18 will be described later.

  The pressure sensor 11 built in the injector 10 includes a sensor main body 11a for detecting fuel pressure and a sensor control circuit 11b. Then, the sensor control circuit 11b performs gain adjustment of the sensor body 11a and offset adjustment of the output signal of the sensor body 11b, and outputs the signal after the offset adjustment to the sensor line LS as a sensor signal.

  More specifically, the sensor body 11a is a sensor whose resistance value changes in accordance with the fuel pressure, and as the supplied current increases, the gain increases and the voltage of the output signal with respect to the fuel pressure increases. It is. For this reason, the sensor control circuit 11b adjusts the gain of the sensor body 11a by changing the current supplied to the sensor body 11a. The sensor control circuit 11b amplifies the output signal of the sensor body 11a by a predetermined factor, adds an offset voltage to the amplified signal, and outputs the signal after the addition as a sensor signal.

  The sensor control circuit 11b can change the gain adjustment amount (that is, the supply current to the sensor body 11a) and the offset adjustment amount (that is, the offset voltage) according to an instruction from the communication processing unit 16. It has become.

  For this reason, the communication processing unit 16 changes the voltage of the sensor signal from the pressure sensor 11 (in other words, the voltage of the sensor line LS) by changing the gain adjustment amount and the offset adjustment amount by the sensor control circuit 11b. To a power supply voltage (5V). The pressure sensor 11 of the reference example may be the same as that of the present embodiment.

  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 assignment process, an ID assignment start command for all of the injectors 10 is sent from the communication driver 21 to the communication line in the first S610. Output to LC.

  However, the ID assignment start command in the present embodiment is broadcast communication data (corresponding to the sweep command communication data) for commanding all of the injectors 10 to sweep the voltage of the sensor line LS.

  Then, as will be described later, when the ID assignment start command from the ECU 20 is received by the communication driver 15, each injector 10 sweeps the voltage of the sensor line LS connecting itself and the ECU 20 from the ground voltage (gradually). To be larger).

Therefore, the microcomputer 23 of the ECU 20 acquires the voltages VS (# 1) to VS (# 4) of each sensor line LS by A / D conversion by the A / D converter 23a in the next S620.
Next, in S630, the voltage VS (# 1) of the sensor line (# 1) LS corresponds to the node ID (“1” in this embodiment) given to the injector (# 1) 10 of # 1. It is determined whether or not Vth (# 1) has been reached, and if it is determined that VS (# 1) has not reached Vth (# 1), the process proceeds directly to S650.

  If it is determined in S630 that VS (# 1) has reached Vth (# 1) ("VS (# 1) ≥ Vth (# 1)"), the process proceeds to S640 and the sensor By turning on the transistor 25a of the state switching circuit 25 corresponding to the line (# 1), the sensor line (# 1) is fixed to low (set to the ground voltage). Then, the process proceeds to S650.

  In S650, the voltage VS (# 2) of the sensor line (# 2) LS corresponds to the voltage Vth (# 2) corresponding to the node ID (“2” in this embodiment) given to the injector (# 2) 10 of # 2. ), And if it is determined that VS (# 2) has not reached Vth (# 2), the process proceeds to S670 as it is.

  If it is determined in S650 that VS (# 2) has reached Vth (# 2) ("VS (# 2) ≥ Vth (# 2)"), the process proceeds to S660 and the sensor By turning on the transistor 25a of the state switching circuit 25 corresponding to the line (# 2), the sensor line (# 2) is fixed to low (set to the ground voltage). Then, the process proceeds to S670.

  In S670, the voltage VS (# 3) of the sensor line (# 3) LS corresponds to the voltage Vth (# 3) corresponding to the node ID (“3” in this embodiment) given to the injector (# 3) 10 of # 3. ), And if it is determined that VS (# 3) has not reached Vth (# 3), the process proceeds to S690.

  If it is determined in S670 that VS (# 3) has reached Vth (# 3) ("VS (# 3) ≥ Vth (# 3)"), the process proceeds to S680 and the sensor By turning on the transistor 25a of the state switching circuit 25 corresponding to the line (# 3), the sensor line (# 3) is fixed to low (set to the ground voltage). Thereafter, the process proceeds to S690.

  In S690, the voltage VS (# 4) of the sensor line (# 4) LS corresponds to the voltage Vth (# 4) corresponding to the node ID (“4” in the present embodiment) given to the injector (# 4) 10 of # 4. ), And if it is determined that VS (# 4) has not reached Vth (# 4), the process proceeds to S710.

  If it is determined in S690 that VS (# 4) has reached Vth (# 4) ("VS (# 4) ≥ Vth (# 4)"), the process proceeds to S700, and the sensor By turning on the transistor 25a of the state switching circuit 25 corresponding to the line (# 4), the sensor line (# 4) is fixed to low (set to the ground voltage). Then, the process proceeds to S710.

  The values of the voltages Vth (# 1) to Vth (# 4) are different from each other. In this embodiment, as an example, “Vth (# 1) = 1V, Vth (# 2) = 2V, Vth ( # 3) = 3V, Vth (# 4) = 4V ”.

  In S710, it is determined whether or not the assignment of node IDs to all the injectors 10 has been completed. Specifically, after the above four processes of S640, S660, S680, and S700 are finished, all the sensor lines LS are fixed to low, and finally the sensor line LS fixed to low is fixed to low. It is determined whether or not a predetermined margin time has elapsed. In addition, after the sensor line (#n) LS is fixed to low on the ECU 20 side, the margin time is low on the sensor line (#n) LS to the ground voltage on the injector (#n) 10 side. It is set to be longer than the delay time until it can be detected.

  If it is determined that the assignment of node IDs to all the injectors 10 has not been completed (S710: NO), the process returns to S620, but it is determined that the assignment of node IDs to all the injectors 10 has been completed. If so (S710: YES), the process proceeds to S720.

In S720, by turning off the transistors 25a of the state switching circuit 25 corresponding to all the sensor lines LS, the low fixing of all the sensor lines LS is released.
Then, the process proceeds to S730, where an ID assignment end command, which is broadcast 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 The grant process ends.

  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 in cooperation with the ID determination circuit 18.

  As shown in FIG. 7B, as the ID setting process, the communication processing unit 16 of the injector (#n) 10 first determines whether or not an ID assignment start command from the ECU 20 has been received by the communication driver 21 in S810. Determine. When the ID assignment start command is received, the process proceeds to S820.

In S820, similar to S320 in FIG. 3B, rewriting of the node ID in the injector (#n) 10 is permitted and the node ID is initialized.
Next, in S830, the sweep of the voltage VS (#n) of the sensor line (#n) LS connecting the injector (#n) 10 and the ECU 20 from the ground voltage is started, and the sensor line (# n) The measurement of the voltage VS (#n) of the LS is also started.

  More specifically, first, the ID discrimination circuit 18 of the injector (#n) 10 repeatedly A / D-converts the voltage VS (#n) of the sensor line (#n) LS (actually at regular intervals). A / D conversion) voltage measurement function. In step S830, the communication processing unit 16 causes the ID determination circuit 18 to start the measurement operation of the voltage VS (#n) (that is, the A / D conversion operation at regular time intervals).

  In addition, the communication processing unit 16 controls the gain adjustment amount and the offset adjustment amount by the sensor control circuit 11b while monitoring the A / D conversion result by the ID determination circuit 18, and thereby the sensor line (#n) LS. The voltage VS (#n) can be set to an arbitrary value. Therefore, the communication processing unit 16 controls the gain adjustment amount and the offset adjustment amount in S830 to first set the voltage VS (#n) of the sensor line (#n) LS to the ground voltage, and at that time Then, a sweep process is started in which the gain adjustment amount and the offset adjustment amount are controlled to increase the voltage VS (#n) at a constant change rate. In the present embodiment, the change speed is the same for all the injectors 10, but may be different for each injector 10.

  On the other hand, when the sweep of the voltage VS (#n) is started in S830, the ID determination circuit 18 not only measures the voltage VS (#n) but also the low edge ( The change to the ground voltage is also detected, and the communication processing unit 16 is notified that the low edge has occurred.

  Therefore, the communication processing unit 16 determines whether or not the ID determination circuit 18 detects that a low edge has occurred in the sensor line (#n) LS in the next S840. Note that the low edge detected here is generated by any of S640, S660, S680, and S700 in the ID assigning process of FIG. 7A performed on the ECU 20 side.

  If the low edge of the sensor line (#n) LS is not detected, the process proceeds to S870 as it is. However, if the low edge of the sensor line (#n) LS is detected, the process proceeds to S850 and the ID determination circuit 18 is processed. The measurement operation of the voltage VS (#n) is stopped.

  Then, in the next S860, the ID discriminating circuit 18 causes the ECU 20 to detect the injector (from the voltage immediately before the low edge (corresponding to the voltage just before the change) described above) that is a measurement value of the voltage VS (#n) immediately before detecting the low edge. #N) The node ID assigned to 10 is specified.

  Specifically, if the voltage immediately before the low edge is a value within a prescribed range that is considered to be “Vth (# 1) = 1V” (for example, a value of “1 ± 0.4” V), the node ID “1” is assigned. If the voltage immediately before the low edge is a value within a prescribed range considered to be “Vth (# 2) = 2V” (for example, a value of “2 ± 0.4” V), the node ID “2” is assigned. If it is determined that the voltage immediately before the low edge is a value within a predetermined range considered to be “Vth (# 3) = 3 V” (for example, a value of “3 ± 0.4” V), it is determined that the node ID “3” is given. If the voltage immediately before the low edge is a value within a prescribed range considered to be “Vth (# 4) = 4 V” (for example, a value of “4 ± 0.4” V), it is determined that the node ID “4” is given. . That is, the ID discriminating circuit 18 of the injector 10 stores the same content as that stored on the ECU 20 side as the voltage-to-ID relationship information indicating the correspondence between the voltage just before the low edge and the node ID. On the injector 10 side, the node ID assigned by the ECU 20 is specified from the voltage-to-ID relationship information and the actual voltage just before the low edge.

  In the next S865, the communication processing unit 16 writes the node ID specified by the ID determination circuit 18 as the node ID of the injector (#n) 10 in the node ID storage unit, and then proceeds to S870.

In S870, it is determined whether or not an ID assignment end command is received from the ECU 20 by the communication driver 21, and if an ID assignment end command is not received, the process returns to S840.
In S840, an affirmative determination is made only once after the sweep of the voltage VS (#n) of the sensor line (#n) LS is started in S830. That is, in S840, it is determined whether or not the ID determination circuit 18 has changed from a state in which no low edge is detected to a state in which a low edge is detected. For this reason, when a low edge occurs in the sensor line (#n) LS and the processes of S850 and S860 are performed, a negative determination is made in the subsequent S840, and the process directly proceeds to S870.

  If it is determined in S870 that the ID assignment end command has been received, the process proceeds to S880, and the voltage sweep of the sensor line LS (#n) is stopped. Then, the original sensor signal (that is, an analog signal representing the fuel pressure detected by the sensor main body 11a) appears on the sensor line LS (#n). In subsequent S890, 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 S810.

Next, the effect | action by the process of FIG. 7 is demonstrated using FIG.
First, as shown in (1) in FIG. 8, an ID assignment start command is transmitted from the ECU 20 to all the injectors 10 (S610).

  Then, as shown in (2) in FIG. 8, each of the injectors (#n) 10 permits rewriting and initialization of its own node ID (S820), and further sensor line (#n) LS. The voltage VS (#n) starts to be swept from the ground voltage, and the measurement of the voltage VS (#n) is also started (S830).

Further, the ECU 20 monitors the voltage VS of each sensor line LS (S620).
Then, as shown at (3-1) in FIG. 8, the ECU 20 reaches the voltage Vth (# 1) corresponding to the node ID “1” when the voltage VS (# 1) of the sensor line (# 1) LS is reached. Then, the sensor line (# 1) LS is fixed to low and a low edge is generated in the sensor line (# 1) LS (S630: YES → S640).

  Similarly, as shown in each of (3-2) to (3-4) in FIG. 8, the ECU 20 corresponds to the node ID “2” where the voltage VS (# 2) of the sensor line (# 2) LS corresponds to the node ID “2”. When the measured voltage Vth (# 2) is reached, the sensor line (# 2) LS is fixed low (S650: YES → S660), and the voltage VS (# 3) of the sensor line (# 3) LS is changed to the node ID “ When the voltage Vth (# 3) corresponding to “3” is reached, the sensor line (# 3) LS is fixed low (S670: YES → S680), and the voltage VS (# 4) of the sensor line (# 4) LS is When the voltage Vth (# 4) corresponding to the node ID “4” is reached, the sensor line (# 4) LS is fixed to low (S690: YES → S700).

  On the other hand, when each injector (#n) 10 detects the low edge of the sensor line (#n) LS connected to itself (S840: YES), the voltage VS (of the sensor line (#n) LS immediately before detecting the low edge is detected. The node ID assigned to the injector (#n) 10 by the ECU 20 is determined from the voltage immediately before the low edge (#n) (S860), and the specified node ID is written in the node ID storage unit as its own node ID ( S865).

  That is, as indicated by (3-1) in FIG. 8, in the injector (# 1) 10, since the voltage immediately before the low edge is Vth (# 1), the node ID “1” corresponding to the Vth (# 1). Is stored as its own node ID, and as shown in (3-2) in FIG. 8, in the injector (# 2) 10, the voltage immediately before the low edge becomes Vth (# 2). The node ID “2” corresponding to 2) is stored as its own node ID. Further, as indicated by (3-3) in FIG. 8, in the injector (# 3) 10, since the voltage immediately before the low edge is Vth (# 3), the node ID “3” corresponding to the Vth (# 3). Is stored as its own node ID, and as shown in (3-4) in FIG. 8, in the injector (# 4) 10, the voltage immediately before the low edge becomes Vth (# 4). The node ID “4” corresponding to 4) is stored as its own node ID.

  Then, when the node ID assignment to all the injectors 10 by the ECU 20 is completed, as shown in (4) in FIG. 8, the ECU 20 releases the low fixing of all the sensor lines LS (S720), and thereafter, FIG. As shown in (5), an ID assignment end command for all the injectors 10 is transmitted from the ECU 20 (S730).

  Then, as shown in (6) in FIG. 8, in all the injectors 10, the voltage sweep of the sensor line LS is stopped, the sensor signal appears on the sensor line LS (S880), and rewriting of the node ID is prohibited. (S890).

  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.

  As described above, in the fuel injection control system 1 of the embodiment, when an ID assignment start command is transmitted from the ECU 20 to all the injectors 10, each injector 10 sweeps the voltage VS of its own sensor line LS from the ground voltage. Let

  When the voltage VS of each sensor line LS reaches the voltage Vth corresponding to the node ID applied to the injector 10 connected to the sensor line LS, the ECU 20 forces the voltage VS of the sensor line LS to the ground voltage. Each of the injectors 10 identifies the node ID given by the ECU 20 from the voltage VS of the sensor line LS immediately before the voltage VS of the sensor line LS connected to the injector 10 is changed to the ground voltage. The stored node ID is stored as its own node ID.

  For this reason, also according to the present embodiment, 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, in order to notify the node ID from the ECU 20 to each injector 10, the sensor line LS for each injector 10 is used, and the voltage sweep of each sensor line LS is performed simultaneously, and the node ID of each injector 10 is changed. Since the notification is performed in parallel, the time required to assign the node ID to all the injectors 10 can be shortened.

  In addition, since the gradient (the changing speed of the voltage VS) at which each injector 10 sweeps the voltage VS of the sensor line LS is the same in all the injectors 10, the configuration of all the injectors 10 can be made exactly the same.

Furthermore, this embodiment is advantageous in that it is not necessary to provide a function for measuring the low time on the injector 10 side.
In the above embodiment, the injector 10 corresponds to a vehicle part, and the communication processing unit 16 corresponds to a communication control unit. 7A performed by the microcomputer 23 in the ECU 20 corresponds to a process as an ID providing unit. In each injector 10, the communication processing unit 16 and the ID determination circuit 18 perform the process illustrated in FIG. ) ID setting processing corresponds to processing as ID setting means. In the present embodiment, the ground voltage corresponds to both the start voltage and the end voltage.

On the other hand, the start voltage for sweeping the voltage VS of the sensor line LS may be a voltage different from the ground voltage.
Further, the ECU 20 may change the voltage VS of the sensor line LS to a predetermined voltage different from the ground voltage in each process of S640, S660, S680, and S700 in FIG. In that case, the injector 10 may determine whether or not the voltage VS of the sensor line LS has changed to the predetermined voltage in the process of S840 in FIG.

  In the injector 10, as a configuration for sweeping the voltage VS of the sensor line LS, for example, a D / A converter, a signal output terminal of the D / A converter, and a signal output terminal of the pressure sensor 11 are provided. When a switching circuit that is selectively connected to the sensor line LS is provided and the voltage VS of the sensor line LS is swept, the signal output terminal of the D / A converter is connected to the sensor line LS by the switching circuit. The output voltage of the D / A converter may be gradually increased.

  FIG. 7B shows an example in which the sweep stop process of S880 is performed after receiving the ID assignment end command, that is, when an affirmative determination is made in S870. However, if the low edge is detected (YES in S840) and the measurement of the sensor line voltage is completed (S850), the sweep stop process in S880 can be performed.

  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, 11a ... Sensor main body, 11b ... Sensor control circuit, 13 ... EEPROM, 15 ... Communication driver, 16 ... Communication processing part, 17 ... Edge discrimination Circuit: 18 ... ID 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) Device), LC ... communication line, LS ... sensor line (signal line for sensor signal)

Claims (3)

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
Sweep for instructing all of the vehicle parts to sweep the voltage of the signal line from a specific start voltage, when the specific timing for giving a node ID to the vehicle parts arrives After outputting the command communication data to the communication line, the voltage of each signal line is monitored, and the voltage of each signal line corresponds to the node ID given to the vehicle component connected to the signal line If it has reached, ID provision means for forcibly changing the voltage of the signal line to a specific end voltage,
Each vehicle component is
When the communication device receives the sweep command communication data, the voltage of the signal line connecting the vehicle part and the electronic control unit is swept from the start voltage, and the voltage of the signal line is monitored, When it is detected that the voltage of the signal line has been changed to the end voltage by the ID giving means, the node ID given to the vehicle part by the ID giving means from the voltage of the signal line immediately before being changed to the end voltage. And ID setting means for performing a process of setting the specified node ID as a node ID of the vehicle part used in the determination process,
A vehicle control system. The vehicle control system according to claim 1,
The start voltage is a voltage of a ground line;
A vehicle control system. The vehicle control system according to claim 1 or 2,
The slope at which the ID setting means of each vehicle part sweeps the voltage of the signal line is the same for all the vehicle parts,
A vehicle control system.

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