WO2018235439A1

WO2018235439A1 - Electronic control device

Info

Publication number: WO2018235439A1
Application number: PCT/JP2018/017695
Authority: WO
Inventors: 寛岩澤; 広津　鉄平; 純之荒田
Original assignee: 日立オートモティブシステムズ株式会社
Priority date: 2017-06-23
Filing date: 2018-05-08
Publication date: 2018-12-27
Also published as: JP2019009620A; JP6806636B2

Abstract

Provided is an electronic control device capable of improving communication efficiency. A higher-order ECU 1 (electronic control unit) is provided with at least a calculation circuit 11, a communication circuit 12, and an EPROM 13 (memory). The communication circuit 12 is connected to a bus wire 2 (bus), and communicates with at least one lower-order ECU 31-33 (lower-order control unit) having a unique ID indicating a unique identifier. The calculation circuit 11 has: a first operation mode wherein the unique ID is collected from the lower-order ECU 31-33 and the collected unique ID is stored in the EPROM 13; and a second operation mode wherein a local ID indicating an identifier shorter than the unique ID is assigned to the lower-order ECU 31-33.

Description

Electronic control unit

The present invention relates to an electronic control device.

[Requirements for wiring reduction]
In recent years, the functional advancement of automobiles has been remarkable, and the number of actuators and sensors mounted on vehicles has been increasing accordingly. Along with that, the weight and cost of the wire harness that connects, for example, an engine control ECU as a host ECU (Electronic Control Unit) and an actuator (for example, an injector for fuel injection) and a sensor are also increasing. . On the other hand, the demand for weight saving for improving the fuel consumption and the like is increasing the demand for reducing wiring of the wire harness. Hereinafter, an actuator and a sensor are abbreviated and described as an actuator etc.

As a wiring saving method of the wire harness used for connection between the host ECU and the actuator etc., the one which has conventionally been directly connected between the host ECU and the actuator etc. by individual wiring is replaced with a common bus wiring, Further, it is effective to add a lower level ECU having a communication function and a control function to each actuator or the like, and perform the control operation by the lower level ECU based on an instruction transmitted from the upper level ECU via communication.

Necessity of bus wiring and collision avoidance
The above-mentioned "bus wiring" is a connection form in which a plurality of electronic control devices are connected to a common wiring. The present connection mode is characterized in that the signal transmitted by the upper ECU is received by all the lower ECUs. In order to distinguish each lower ECU, this is done by specifying an individually assigned ID. The bus wiring method has a merit that the weight and cost of the wire harness can be reduced because the number and structure of the wiring are simplified as compared with the conventional direct connection method.

On the other hand, there are disadvantages to the bus wiring method. If ID's overlap in the same bus wiring, a plurality of lower ECUs may simultaneously reply, causing a signal collision, and communication may not be established.

[Unique ID]
To avoid this, it is necessary to take measures so that the IDs in the same bus wiring do not overlap. This can be realized by assigning a unique ID (hereinafter referred to as a unique ID) to all the lower ECUs to be produced. However, since it is necessary to secure this unique ID more than the number of lower-level ECUs that can produce the maximum value that can be taken, it is necessary to increase the number of digits (the number of bits when representing the unique ID in binary). is there. On the other hand, since this ID needs to be transmitted as a destination for each communication, if the number of digits is large, the communication efficiency will be reduced accordingly.

[Request to startup time]
Next, the request for the start-up time in the control apparatus for a car (hereinafter referred to as an on-board ECU) will be described. In the on-board ECU, it is necessary to complete the key ON (for example, start switch ON or ignition switch ON), that is, the time from when the user starts the vehicle to when the engine etc. actually start There is. For this purpose, it is also necessary to shorten the start-up time of communication between the upper ECU and the lower ECU.

[Requirements for reliability]
On the other hand, in-vehicle ECUs also have high reliability requirements. Specifically, if the lower-level ECU connected in the network is broken or the wiring is broken during the idle period of the vehicle, the engine etc. can not be operated properly if it is attempted to start as it is. In some cases, the entire system such as the engine may be damaged. In order to prevent this, it is necessary to have a function to diagnose whether all lower ECUs are properly connected.

[Conventional example]
As such a diagnostic method, an example as shown by patent document 1 is known. In this patent document, a method is presented in which the upper supervisory control terminal stores the identification information of the lower monitoring target device and calls the corresponding monitoring target device to monitor whether the connection of the monitoring target device is normal or not. ing. By applying this method, it can be diagnosed whether all lower ECUs are connected correctly, and the reliability of the entire system can be improved.

JP, 2005-284711, A

On the other hand, the method disclosed in Patent Document 1 is not effective in solving the problems related to the requirement for communication efficiency and activation time.

An object of the present invention is to provide an electronic control device capable of improving communication efficiency.

In order to achieve the above object, the present invention provides a communication circuit connected to a bus and in communication with at least one lower control apparatus having a unique ID indicating a unique identifier, a memory, and the unique ID from the lower control apparatus. An arithmetic circuit having a first operation mode for collecting the unique ID and storing the collected unique ID in the memory and a second operation mode for assigning a local ID indicating an identifier shorter than the unique ID to the lower control apparatus Prepare.

According to the present invention, communication efficiency can be improved. Problems, configurations, and effects other than those described above will be apparent from the description of the embodiments below.

It is a circuit block diagram showing the connection composition of the electronic control unit by the embodiment concerning the present invention. It is a timing chart showing the timing of operation in the electronic control unit by the embodiment concerning the present invention. It is a table showing the configuration information of the lower ECU in the electronic control unit according to the embodiment of the present invention. It is a block diagram for demonstrating the operation | movement which the electronic control unit (upper rank ECU) by embodiment based on this invention identifies the order of a low-order ECU. FIG. 5 is a sequence diagram of an electronic control unit (upper ECU) and a lower ECU according to the embodiment of the present invention. FIG. 7 is another sequence diagram of the electronic control unit (upper ECU) and the lower ECU according to the embodiment of the present invention.

Hereinafter, the configuration and operation of an electronic control unit according to an embodiment of the present invention will be described using the drawings. In each figure, the same numerals show the same portion. Note that the present embodiment relates to an electronic control unit (hereinafter referred to as “upper-level ECU”) for controlling an engine, a transmission, etc. of an automobile, and a plurality of lower-level electronic control units (hereinafter referred to as “lower-level ECU”) And using bus-like wiring for connection to the lower ECU, and in particular, shortening the communication start-up time with the lower ECU and improving the communication efficiency, and reliability. The present invention relates to a host ECU provided with means for securing the flexibility.

[overall structure]
Hereinafter, the connection configuration and operation of the electronic control device and the like according to the embodiment of the present invention will be described with reference to FIGS. 1, 2 and 3. The electronic control unit according to the present embodiment is described as the host ECU 1 in the figure, and the entire system includes the bus wiring 2, a plurality of lower ECUs 31 to 33, a plurality of actuators 41 to 43, etc. It consists of objects 51-53.

The host ECU 1 is connected to the bus line 2, and the inside thereof includes an arithmetic circuit 11, a communication circuit 12, and a non-volatile memory (hereinafter referred to as an EPROM) 13. The EPROM 13 also stores configuration information 14 of the lower ECUs connected. The configuration information is information obtained by aggregating information such as a unique ID and a local ID (described later) for each lower ECU.

Although it is preferable in terms of cost that the EPROM 13 is specifically implemented by an EEPROM (Electrically Erasable and Programmable Read-Only Memory), it is preferable to use another form such as a battery backup RAM or a ferroelectric memory. It may be a non-volatile memory.

The bus wiring 2 has a bus-like wiring configuration, and the lower ECUs 31 to 33 in addition to the upper ECU 1 are logically equally connected.

The lower ECUs 31 to 33 are connected to the bus wiring 2 and internally include an arithmetic circuit 301, a communication circuit 302, a non-volatile memory (hereinafter referred to as ROM) 303, and a volatile memory (hereinafter referred to as RAM) 305 Be done. The lower ECUs 31 to 33 can receive a command from the arithmetic circuit 11 of the upper ECU 1 by a communication method not shown, and can output control to actuators 41 to 43 described later through the arithmetic circuit 301.

The ROM 303 stores its own unique ID 304, and the RAM 305 stores its own local ID 306. These ID information will be described later. In addition, since the unique ID 304 does not need to be rewritten after the lower-level ECU is produced, it is preferable that the ROM 303 storing the same be implemented as a one-time PROM with a fuse circuit or the like in terms of cost and reliability. However, it may be a non-volatile memory in another form such as an EEPROM.

The actuators 41 to 43 are, for example, injectors for fuel injection and solenoid valves for hydraulic pressure control, and perform control operations on control targets 51 to 53 described later according to the control output from the arithmetic circuit 301. In the example of FIG. 1, although the control objects 51 to 53 are schematically shown separately, they may be integrated. For example, when the actuators etc. 41 to 43 are respectively an injector, an ignition device, and a temperature sensor (such as a temperature sensor of cooling water), the control targets 51 to 53 can be an engine (internal combustion engine) and can be integrally shown.

The control objects 51 to 53 are, for example, an engine and a transmission, and are driven by control operations of actuators 41 to 43 to realize functions such as power supply and gear change.

Although the lower ECUs 31 to 33 and the actuators 41 to 43 are three each in this embodiment, the present invention can be applied to a number other than three.

Thus, the host ECU 1 (electronic control unit) of the present embodiment includes at least the arithmetic circuit 11, the communication circuit 12, and the EPROM 13 (memory). The communication circuit 12 is connected to the bus wiring 2 (bus) and communicates with at least one lower ECU 31 to 33 (lower controller) having a unique ID indicating a unique identifier. Arithmetic circuit 11 collects the unique ID from lower ECUs 31 to 33, and stores the collected unique ID in EPROM 13 and assigns a local ID indicating an identifier shorter than the unique ID to lower ECUs 31 to 33 as a second operation mode. It has an operation mode.

As a result, the host ECU 1 can communicate with the lower ECUs 31 to 33 using a local ID shorter than the unique ID. As a result, communication efficiency is improved.

[Unique ID]
Next, the unique ID 304 will be described. The unique ID 304 is an ID uniquely assigned at the time of manufacture of the lower ECU, and a number centrally managed so as not to be duplicated in all lower ECUs is allocated. By performing communication with this unique ID 304 as the destination, ID duplication will occur even if the lower ECU is incorporated into the network in any combination at the assembly stage of the entire ECU network (upper ECU, bus wiring, and multiple lower ECUs). Can be avoided. Further, by managing the information in connection with type information and manufacturing information as a secondary application, it can be used for product management (traceability) including after shipment.

Although this unique ID 304 is represented by a finite number of digits, the number of digits must be set so that the maximum value is larger than the number of lower ECUs that can be produced. For example, if 100 lower-level ECUs are installed in 100 million vehicles a year, it is necessary to prepare 1 trillion unique IDs in 100 years. This requires a 40-bit ID number (2 to the power of 40) when expressed in binary numbers, and it is difficult to issue an ID without gaps in practice, so there is a margin. It is necessary to prepare a number of digits of about 48 bits.

[Local ID]
Although communication can be performed by using the above-mentioned unique ID, communication takes time because of the large number of digits, and there is a problem that communication efficiency can not be improved. In the present embodiment, the number of lower ECUs connected to the entire ECU network is three, but even in practical applications, the upper limit is often about 10 because of problems such as communication capacity. In this case, the number of ID digits required for the purpose of identification in the network is as short as 4 bits. Thus, by replacing the unique ID 304 with a shorter ID (hereinafter referred to as a local ID 306), communication time can be shortened and communication efficiency can be improved.

For example, if the unique ID is 48 bits in length, the local ID is 4 bits in length, the number of lower ECUs is 10, and the communication speed is 200 kbps, the upper ECU performs individual communication to all lower ECUs once. Considering the time difference it takes, the difference between using a unique ID and using a local ID is 2 ms. That is, when the local ID is used, the time of 2 ms can be shortened for each communication, and the communication efficiency can be improved.

The local ID is determined by the upper ECU after all the unique IDs 304 are collected, and assigned to the lower ECU. At this time, the arithmetic circuit 11 of the host ECU 1 records the relationship between the unique ID 304 and the local ID 306 in the EPROM 13 as the lower ECU configuration information 14. The lower-level ECU configuration information 14 is storage information that can store information of the unique ID 304, the local ID 306, and an ACK described later for each lower-level ECU 31 to 33, as shown in FIG.

[First operation mode]
Hereinafter, the operation of the host ECU 1 in the present embodiment in the communication start-up will be described. Communication startup in this embodiment is divided into first and second two modes as shown in FIG.

In the first operation mode, the host ECU 1 collects the unique IDs 304 of the lower ECUs 31 to 33 and collects the unique ID 304 in the unique ID column of the lower ECU configuration information 14 and the local ID column, and a local ID which is a unique 8-bit number. Are respectively stored (FIG. 3 left). The method of determining the local ID will be described later.

This operation mode is performed immediately after assembling the ECU network. As a specific method, the upper level ECU 1 communicates with the lower level ECUs 31 to 33 by broadcast communication to request the unique ID 304, and the lower level ECUs 31 to 33 return their own unique ID 304 in response thereto. The reason for using broadcast here is that the unique ID is unknown at this stage and one-to-one communication is impossible.

Collision control by using random numbers
Here, since the lower level ECUs 31 to 33 are connected to the same bus wiring 2, when the lower level ECUs 31 to 33 simply respond to the unique ID request, their communication collides, and communication is not established. In order to avoid this, it is effective to perform random number processing in each lower ECU based on its own unique ID to determine the presence or absence of a reply. By updating the random number value for each unique ID request, it is possible for the upper-level ECU 1 to repeat the unique ID request many times while the timing for only one lower ECU to reply is reached, and collisions can be avoided and the uniqueness can be collected.

As a method of such random number processing, a circuit scale which requires a type using a linear feedback shift register can be small, which is preferable. Specifically, when receiving the request for the unique ID, the arithmetic circuit 301 of the lower ECU 31 inputs its own unique ID 304 stored in the ROM 303 into the linear feedback shift register (not shown). The linear feedback shift register generates and outputs a random number using the input unique ID 304 as a seed. For example, when the random number is equal to or more than a predetermined threshold value, the arithmetic circuit 301 of the lower ECU 31 notifies the upper ECU 1 of its own unique ID 304 using the communication circuit 302.

In addition, in order to collect all the unique IDs, this procedure requires repeating the request for the unique ID several hundreds times even if the number of unique IDs is about 10, which takes a long time. However, this operation mode is an assembly stage of the product, and a relatively long processing time can be allowed as compared with the key ON described later.

Here, the arithmetic circuit 11 of the host ECU 1 (electronic control unit) simultaneously transmits a unique ID acquisition request to all the lower ECUs 31 to 33 (lower controller) via the communication circuit 12. Each lower-level ECU 31 to 33 (lower-level control device) responds to the communication circuit 302 connected to the bus wiring 2 (bus), the ROM 303 (memory) storing the unique ID, and the unique ID acquisition request. And an arithmetic circuit 301 for transmitting the unique ID to the host ECU 1 via the communication circuit 302 at the timing calculated based on the ID. It is possible to suppress that the respective lower ECUs 31 to 33 transmit the unique ID simultaneously. As a result, communication collisions can be suppressed.

[Determination of local ID]
For each unique ID 304 thus collected, the corresponding local ID 306 is determined. The method of allocation may be completely random, but it is desirable to allocate the local ID 306 in accordance with the function (for example, in which cylinder) the lower-level ECUs 31-33 are in charge of the actuators 41-43.

That is, preferably, the arithmetic circuit 11 of the host ECU 1 determines the local ID according to the functions of the actuators 41 to 43 controlled by the respective lower ECUs 31 to 33 (lower controller).

This is because the function corresponding to the local ID 306 is always the same when viewed from the host ECU 1, and thus no special conversion process is required in the operation instruction.

In order to determine the functions of the actuators 41 to 43 that the lower ECUs 31 to 33 are in charge of, the detection of the order in which the lower ECUs 31 to 33 are connected to the bus wiring 2 is performed. As a specific method, as will be described later, for example, a current for detection is caused to flow to a specific lower-level ECU, and the connection order is detected using a ratio in which the current for detection is divided by the wiring resistance of the bus wiring 2 can do.

[Identification of the order of ECUs connected to the bus]
As shown in FIG. 4, the arithmetic circuit 11 of the host ECU 1 transmits a command to apply the current I 0 to the bus wiring 2 to each of the plurality of lower ECUs 31 to 33. Here, the

current detection resistors

141 and 142, the

amplifiers

131 and 132, and the arithmetic circuit 11 constitute a current sensor CS. The current sensor CS measures the current Is1 flowing through the port 111 and the current Is2 flowing through the port 112 when the plurality of lower ECUs 31 to 33 apply the current I0 to the bus line 2, respectively.

On the other hand, in the lower ECUs 31 to 33, the load resistor 311, the switch 312 such as a transistor, and the arithmetic circuit 301 constitute a current application device CA. The load resistor 311 and the switch 312 are connected in series between the wire 21 and the wire 22. The arithmetic circuit 301 turns on the switch 312 when it receives a command to apply a current to the bus wiring 2 from the host ECU 1.

The arithmetic circuit 11 of the host ECU 1 identifies the order on the bus wiring 2 of the plurality of lower ECUs 31 to 33 based on the current Is1 and the current Is2 measured for each of the plurality of lower ECUs 31 to 33. In FIG. 4, the wiring resistance 23 is schematically represented.

For example, the arithmetic circuit 11 of the host ECU 1 identifies the order on the bus wiring 2 of the plurality of lower ECUs 31 to 33 based on the difference between the current Is1 and the current Is2 measured for each of the plurality of lower ECUs 31 to 33. Do. In detail, the arithmetic circuit 11 of the host ECU 1 arranges the differences (Is1-Is2) of the current values measured for the respective lower ECUs 31 to 33 in the descending order of the current values on the bus wiring 2 of the lower ECUs 31 to 33. Identify the order.

Note that the arithmetic circuit 11 of the host ECU 1 generates a plurality of low-order signals based on the ratio of the difference between the currents Is1 and Is2 measured for each of the low-order ECUs 31 to 33 and the sum of the currents Is1 and Is2. The order on the bus lines 2 of the ECUs 31 to 33 may be identified.

Thus, the arithmetic circuit 11 of the host ECU 1 can identify the order on the bus wiring 2 of the lower ECUs 31 to 33. The arithmetic circuit 11 of the host ECU 1 determines the function of the actuator from the order on the bus wiring 2 of the lower ECUs 31 to 33.

For example, the host ECU 1 sequentially includes, from the port 111, an injector of # 1 cylinder disposed in the engine to an injector of # 4 cylinder disposed in the engine, and a # 1 solenoid valve to #n solenoid valve disposed in the transmission. Design information indicating that various # 1 sensors to #n sensors are connected to the bus line 2 is stored in the EPROM 13. The arithmetic circuit 11 of the upper ECU 1 can determine the functions of actuators 41 to 43 that the lower ECUs 31 to 33 are in charge of from the identified lower ECUs 31 to 33 in order by referring to the design information.

The arithmetic circuit 11 of the host ECU 1 uses, for example, an ID assigned to each function as design information as a local ID. Note that the arithmetic circuit 11 of the host ECU 1 may calculate the local ID by performing a predetermined operation in order on the bus wiring 2 of the identified lower ECUs 31 to 33.

As described above, the arithmetic circuit 11 of the host ECU 1 identifies the connection order of the lower ECUs 31 to 33 (lower controller) in the bus wiring 2 (bus), and the local ECUs 31 to 33 localize according to the identified connection order. Determine the ID.

[Second operation mode]
Next, the operation in the second operation mode will be described. The second operation mode is started by a key-on operation instructing the start of the vehicle as shown in FIG. In the present operation mode, first, the upper ECU 1 performs communication to assign the local IDs individually to the lower ECUs 31 to 33 based on the unique ID field and the local ID field of the lower ECU configuration information 14. In addition, the lower ECUs 31 to 33 return an acknowledgment (hereinafter, referred to as an ACK) to the communication. The host ECU 1 registers in the ACK column of the lower ECU configuration information 14 whether or not this ACK has been returned for each communication (FIG. 3 right).

This operation mode is implemented each time the key is turned on.

As a specific method, first, the corresponding local ID (“1” in FIG. 3) is assigned to the unique ID (“8c7f0aac” in FIG. 3) of the lower ECU 31 from the upper ECU 1. The lower ECU 31 stores the received value of the local ID in its own RAM 306, and sends back an ACK signal to the upper ECU 1. When the upper ECU 1 receives the ACK, the upper ECU 1 records information indicating “OK” in the ACK column of the lower ECU configuration information 14, and records information indicating “NG” if the information can not be received.

The host ECU 1 repeats the above process as many as the number of the lower ECUs described in the configuration information 14. Here, for example, assuming that a disconnection (symbol 6 in FIG. 1) occurs between the lower ECU 33 and the bus wiring 2, the lower ECU 33 can not receive the communication of the local ID assignment, and returns an ACK signal. I can not do it either. As a result, information indicating "NG" is recorded in the ACK column of the lower ECU configuration information 14.

[Communication using local ID]
Thus, after the local ID is assigned to the lower ECUs 31 to 33, communication between the upper ECU 1 and the lower ECUs 31 to 33 can be performed using the local ID. As described above, since the local ID has a shorter number of digits than the unique ID, communication time can be shortened, and communication efficiency can be improved.

[Diagnosis of lower ECU connection configuration]
Further, according to the ACK column of the lower ECU configuration information 14, the connection configuration of the lower ECUs 31 to 33 is abnormal, that is, the failure of the lower ECUs 31 to 33 or the disconnection (6 in FIG. 1) Can be diagnosed. In the present embodiment, in the lower ECU configuration information 14, since the ACK column of the lower ECU 33 is “NG”, it can be determined that an abnormality occurs in the connection with the lower ECU 33.

In other words, the arithmetic circuit 11 of the host ECU 1 transmits the local ID to the lower ECUs 31 to 33 (lower controller) via the communication circuit 12 in the second operation mode, and the lower ECUs 31 to 31 via the communication circuit 12 When an ACK (acknowledgement response) indicating that the local ID has been received is received from 33, it is diagnosed that the communication between the lower ECUs 31 to 33 and the communication circuit is normal, and when the ACK is not received, the lower ECUs 31 to 33 are received. And the communication circuit 12 is diagnosed as abnormal.

In addition, even if the connection configuration is normal, there is a possibility that the ACK can not be received due to noise or the like, so when communication can not be received, it is possible to distinguish single-shot noise and abnormality of the connection configuration by trying communication multiple times. .

If an abnormality in the connection configuration is detected, communication with the lower-level ECU can not be performed, and there is a high possibility that the vehicle can not be operated safely. Take measures such as For example, when the upper ECU can not receive ACK from at least one lower ECU, it determines that it is abnormal, for example, turns on a warning light. By thus diagnosing the ECU connection configuration, it is possible to improve the reliability required for the on-vehicle device.

Note that there are a plurality of lower level ECUs (lower level control devices), and each lower level ECU controls an actuator. The arithmetic circuit 11 of the host ECU 1 determines that the communication between the lower ECUs 31 to 33 (lower controller) and the communication circuit 12 is all normal. Start sending and receiving data used to control the This can improve the reliability of communication.

[Startup time reduction effect]
As described above, by the operation in the second operation mode, as shown in FIG. 5A, the assignment of the local ID and the diagnosis of the lower ECU connection configuration can be performed. Here, in order to simplify the process in the host ECU, as shown in FIG. 5B, the assignment of the local ID and the diagnosis of the lower ECU connection configuration can also be performed by separate communications. However, when this method is adopted, it is necessary to communicate with each lower ECU twice, which takes time. Generally, in-vehicle ECUs are required to perform in a short time from key ON to completion of system startup. In order to realize this, it is necessary to shorten the communication time with the lower ECU as much as possible, and as described in the present embodiment, it is effective to perform the allocation of the local ID and the diagnosis of the lower ECU connection configuration by the same communication is there.

That is, since the host ECU 1 communicates with the lower ECUs 31 to 33 using a local ID shorter than the unique ID, the communication data amount is reduced, and the communication time is shortened. As a result, system startup time is shortened.

As described above, according to the present embodiment, communication efficiency can be improved. As a result, system startup time is shortened.

The present invention is not limited to the above-described embodiment, but includes various modifications. For example, the embodiments described above are described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the described configurations.

In addition, each of the configurations, functions, and the like described above may be realized by hardware by designing part or all of them, for example, by an integrated circuit. In addition, each configuration, function, and the like described above may be realized by software by a processor (arithmetic circuit) interpreting and executing a program that realizes each function. Information such as a program, a table, and a file for realizing each function can be placed in a memory, a hard disk, a recording device such as an SSD (Solid State Drive), or a recording medium such as an IC card, an SD card, or a DVD.

The embodiment of the present invention may have the following aspects.

(1) A plurality of lower control devices having unique IDs are connected by bus-like wiring, have at least two operation modes, and collect unique IDs of lower control devices in the first operation mode and store them In the second control mode, a local ID shorter than the unique ID is allocated to the lower control device having the unique ID stored in the second operation mode.

(2) In the electronic control unit according to (1), based on the presence or absence of the reply of the communication to which the local ID is assigned, it is diagnosed whether all the lower control units having the stored unique ID are connected. An electronic control unit, which, when normal, starts normal communication with the lower control unit.

(3) The electronic control unit according to (1), wherein the local ID is determined in accordance with the assigned function of an actuator or the like connected to each of the low-order control units.

(4) In the electronic control unit according to (1), the local ID is determined according to the connection order of the bus-like wirings of the lower control units.

According to the above (1) to (4), in addition to the improvement of the reliability, the improvement of the communication efficiency and the shortening of the start-up time can be realized, and an electronic control device suitable for in-vehicle use can be provided.

1: Upper ECU
2: Bus wiring 31 to 33: Lower ECU
41 to 43: Actuators 51 to 53: Control target 6: Open point 11: Arithmetic circuit 12: Communication circuit 13: Nonvolatile memory 14: Lower ECU configuration information 301: Arithmetic circuit 302: Communication circuit 303: Nonvolatile memory 304: Nonvolatile memory 304: Unique ID
305: Volatile memory 306: Local ID

Claims

A communication circuit connected to the bus and in communication with at least one lower control apparatus having a unique ID indicating a unique identifier;
With memory
A second operation of collecting the unique ID from the lower control device, and assigning a first operation mode for storing the collected unique ID in the memory and a local ID indicating an identifier shorter than the unique ID to the lower control device An arithmetic circuit having a mode;
An electronic control unit comprising:
The electronic control device according to claim 1, wherein
The arithmetic circuit is
In the second operation mode, the local ID is transmitted to the lower control apparatus via the communication circuit, and an acknowledgment indicating that the local ID is received from the lower control apparatus is received via the communication circuit If it is determined that the communication between the lower control apparatus and the communication circuit is normal and the acknowledgment is not received, the communication between the lower control apparatus and the communication circuit is abnormal An electronic control unit characterized by diagnosing.
The electronic control device according to claim 2, wherein
There are a plurality of lower control devices, and each lower control device controls an actuator,
The arithmetic circuit is
When it is diagnosed that all communication between each lower control apparatus and the communication circuit is normal, transmission and reception of data used for control of the actuator is started between the lower control apparatus and the communication circuit. An electronic control unit characterized by
The electronic control device according to claim 1, wherein
The arithmetic circuit is
An electronic control unit characterized in that the local ID is determined according to the function of an actuator controlled by each lower control unit.
The electronic control device according to claim 1, wherein
The arithmetic circuit is
Identifying a connection order of the lower control apparatus on the bus;
An electronic control device characterized in that the local ID of each lower control device is determined according to the identified connection order.
A system comprising the electronic control device according to claim 1 and a plurality of lower control devices,
The arithmetic circuit of the electronic control unit
Simultaneously transmitting an acquisition request for the unique ID to all lower control devices via the communication circuit;
Each lower control unit is
A communication circuit connected to the bus;
A memory for storing a unique ID,
An arithmetic circuit that transmits the unique ID to the electronic control device via the communication circuit at a timing calculated based on the unique ID in response to the acquisition request for the unique ID. system.