JP3334953B2 - Automotive communication system and control unit thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system for an automobile using a serial data transmission technique and a control unit therefor.
Relates to Tsu bets, in particular, it relates <br/> the communication system and a control unit for a suitable car for flexibility in the type of communication system.

[0002]

2. Description of the Related Art Various types of communication systems utilizing serial data transmission technology in automobiles are disclosed in, for example, Japanese Patent Application Laid-Open No. Sho 59-230345 ,
S. Est - Yi - Paix - Pas No. 920229 (SAE
Paper 920229) is known.
You.

[0003]

In these prior arts, real-time communication between a plurality of control units requiring different communication protocols (communication methods) has not been considered.

It is an object of the present invention to provide different communication protocols.
(Communication method) between multiple control units that require
Vehicle communication processing system that can communicate in real time
System and a control unit .

[0014]

The above object is achieved by a CPU (C
A plurality of transmission control programs stored in a memory using a microcomputer having a built-in sub-processor which can be separately controlled from the central processing unit (unit).
Ram is processed in parallel by the sub-processor,
Achieved.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTIONThe background of this embodiment is as follows.
It will be described below. Japanese Patent Application Laid-Open No. 59-230345 discloses a
Place a number of control signal wires on one or several signal transmission lines.
In other words, control signals are transmitted using serial multiplex data transmission technology.
Transmission for automobiles that control electrical equipment.
The trust system has been described. Such a car body
Communication systems for electrical equipment control have recently been
Classified as "Class A". Traffic in cars
The application of communication technology is not limited to Class A,
Control unit and external diagnostic equipment for failure diagnosis of
There is a "class B" that connects by serial communication. Also,
Engine control, transmission control, or suspension
Individual microcomputer control units such as
Units are connected by serial data transmission, and
Communication systems that implement a time-distributed control system
C ". Each such Kind of concrete car
Communication system for the US
No. 920228 (SAE Paper9)
20228). Such automatic
Realize serial data transmission in car communication system
LSI technology is widely used as a communication processing device.
The above-mentioned American Automobile Technology Association S.E.A.-Paper ninth
No. 20228 (SAE Paper 920228)
There is also a detailed description of various types of communication LSIs. Same report
As described in the above, for various types of automobiles for class A, B, C
Communication methods have been proposed and
A dedicated LSI has been developed. Hereinafter, using a dedicated LSI
From the viewpoint of the configuration method of the communication processing device
Organize and state. <First conventional technology> Asynchronous serial communication interface ACIA (Asynchr
onous CommunicationInterface Adapter)
1 is a communication system for a vehicle used as a control device. AC
IA has a general-purpose LSI such as Hitachi's HD6350.
-Communication between the sonal computers, etc.
Widely used. Recent single-chip microphones
In a local computer, H8 / 532 (HD647532 manufactured by Hitachi, Ltd.)
8) Various products with built-in ACIA, such as
ing. Communication processing of ACIA with built-in microcomputer
Use as a device is cost-effective,
It is often used in vehicle communication systems. However
However, in ACIA, data that can be transmitted in one data transmission
Data is limited to one byte. Also, data by transmission
1-bit parity for error detection and error correction functions
In a car environment with only a check function and a lot of electromagnetic noise
Is often inadequate. The problem above is that the microphone
The computer performs part of the communication processing control with software.
By doing so, it can be reduced to some extent. But this
In some cases, depending on the control system, the microcomputer
May interfere with the original control functions of the
ACIA is used only for applications. <Second conventional technology> As described in JP-A-59-230345.
And microcomputer -Communication processing device without using
Using a dedicated LSI, and load control on this dedicated LSI
It is a communication system for vehicles having functions. This configuration
In this case, since a microcomputer is not used, complicated
Load control cannot be realized. Therefore, the power window and
Relatively simple system such as body control for door lock doors, etc.
It is an effective communication processing device for the system. <Third conventional technology> Developed for automotive applications such as Intel AN82526
For automobiles using the dedicated LSI as a communication processor
It is a communication system. Dedicated outside the microcomputer
When an LSI is installed, the above-mentioned data in ACIA
Length, transmission error control or main body microcomputer
Problems such as software load can be almost solved. Only
However, the scale of the LSI as a communication processing device is large.
This raises another problem of high cost. <Fourth conventional technology> A dedicated function as a communication processing device for a microcomputer
It is a built-in vehicle communication system. Philips
PCA82C200 is an example of this. With this conventional technology
Provides a part of the function of the communication processing device to a microcomputer
The processing circuit that executes the communication
-The size of the hardware has been suppressed to some extent. This conventional technique
The technique is more costly than the third prior art external-only LSI method.
This is advantageous in terms of cost. However, with a microcomputer
Microcomputer to handle some communication processing
Of the original control function. In addition, micro
Speed up transmission speed due to software processing of computer
There is an obstacle in running. <Fifth conventional technology> The second conventional technology and the third conventional technology as communication processing devices
Is a communication system for automobiles in which
This is described in detail in Japanese Patent Publication No. 230345. This fifth
In conventional technology, control units are classified into central offices and terminal offices.
In the central office, a dedicated external LSI is installed as a communication processing device.
The dedicated LSI, which is a communication processing device, is loaded at the terminal station.
It also has a control function. Third slave using only external dedicated LSI
Unlike conventional technology, the terminal station is composed of dedicated LSI only.
Therefore, it is advantageous in terms of cost. Also in this case, micro
A central office having a computer issues a load control command.
Was Control operation much more complicated than the second prior art
Can be realized, and the applicable range is wide. However, this fifth conventional
Even in technology, core
The problem of rising strikes remains. Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
This will be described with reference to FIG. 1 to 3 show a first embodiment of the present invention.
It is a lineblock diagram of the communication system for vehicles concerning an example. This implementation
Examples are disclosed in JP-A-59-230345 or US Pat.
Automotive Engineering Society S.A.E.Paper 920229
Communication (SAE Paper 920229)
As with the system, the door window up / down and power lock
Lamps such as headlights, direction indicators, or
Communication system for body electrical equipment for controlling power sheets, etc.
A communication system of class A.

FIG. 1 is an overall configuration diagram of a vehicle communication system according to this embodiment. The central office 100 has a communication line 200
Are connected to the terminal stations 300, 400, and 500 via. The central station 100 and the terminal station 400 are arranged behind the instrument panel, the terminal station 300 is arranged near the steering column, and the terminal station 500 is arranged near the headlight.

The central office 100 acquires all input information of the communication system for vehicles. That is, the state of the key switch 101 input to the central office 100 is directly read, and the headlight switch 30 input to the terminal station 300 is read.
The state of 1 is detected via the communication line 200. Central Office 10
0 controls all output states of the vehicle communication system based on the input information. That is, the central office 100
Directly outputs a control signal to the display 102 connected to the terminal station 400, and a buzzer connected to the terminal stations 400 and 500.
Control signals to 401 and headlights 501 are transmitted via communication line 200.

The terminal stations 300, 400, and 500 detect various switches and sensor information and transmit them to the central station 100, and receive control signals from the central station 100 to various loads and supply these to the loads. .

FIG. 2 is a configuration diagram of the central office 100. In this embodiment, the central office 100 has a microcomputer 1 having a CPU 111 (Central Processing Unit) and a sub-processor 112 for body control processing.
10 (for example, Hitachi H8 / 570, HD6475708). The sub processor 112 includes a CPU 111
The input / output circuit 113 can be controlled independently of this. The sub processor of the Hitachi H8 / 570 is ISP (Intel
igent Sub Processor), which is referred to herein as a sub-processor. The CPU 111 and the sub-processor 112 can send and receive data via the shared memory 114. The shared memory 114 is a general-purpose register and a RAM.
(Random Access Memory). Also, C
The PU 111 and the sub-processor 112 each have a ROM
(Read Only Memory) 115 and 116 operate in accordance with the programs stored therein.

A dedicated analog IC 120 is provided outside the microcomputer 110 and connected to an input / output circuit 113 of the microcomputer. Dedicated analog IC1
Reference numeral 20 denotes an analog driver 121 for serial transmission, an analog receiver 122, and a level converter 123. The analog driver 121 and the analog receiver 122 are connected to the communication line 200. The analog driver 121 converts a transmission signal output from the input / output circuit 113 into a signal level at which the communication line 200 can be driven,
In addition, excess harmonic frequency components are removed. Further, the analog receiver 122 receives a signal transmitted to the communication line,
The transmission distortion is removed, and the signal level is converted to a signal level at which the input / output circuit 113 can determine the logic.

On the other hand, the level converter 123 changes the signal level of the switch 101 inputted thereto into a battery voltage (+
VB) to a logic level at which the input / output terminal 113 can determine the logic. At this time, surge and spike voltages mixed into the output of the switch 101 are removed. The level converter 123 turns on / off the display 102 according to the output state of the input / output terminal 113, and supplies a current sufficient for operating the display 102.

FIG. 3 is a configuration diagram of the terminal station 300. It is configured using a dedicated LSI 310 in which a communication processing circuit 311 and a load interface circuit 312 are integrated. The same applies to the terminal stations 400 and 500. The configuration of the dedicated LSI of this embodiment is based on the
・ Paper No.920229 (SAE Paper92022)
9) Exclusive L for LCU (Local Control Unit)
Same as SI.

The operation of the vehicle communication system according to this embodiment will be described below. Here, as an example, the terminal station 3
The lighting control of the headlight based on the headlight switch connected to 00 will be described.

The microcomputer 11 of the central office 100
0, the CPU 111 reads the ROM 1 as described above.
15 operates in accordance with the body control processing program stored in the program 15. The CPU 111 transmits control data for controlling the load to each terminal station, and receives monitor data indicating a switch / sensor state from each terminal station. The communication system used here is the American Automotive Engineers Association S.A.E.P.
No. 920229 (SAE Paper 920229), the control data is first sent from the central office.
The monitor data is transmitted, and monitor data is received as a reply.
The address data is used to select the terminal station of the transmission / reception partner.
By transmitting the address data together with the control data, the terminal station is identified as a transmission / reception partner. The order of transmission and reception is the same as the order described in the address table in the ROM 115. In this embodiment, each terminal station is sequentially set as a transmission / reception partner.

An outline of data transmission and reception will be described below. In order to start transmission / reception, first, the CPU 1 shown in FIG.
Reference numeral 11 denotes address data and control data in the shared memory 114.
Write data. Next, a transmission request is issued to the sub-processor 112. The sub-processor 112 receives this transmission request and starts data transmission. That is, by referring to the address data and the control data written in the shared memory 114, the output logic state of the input / output circuit 113 is controlled to generate a signal waveform sequence of the transmission signal. This transmission signal is transmitted by the analog driver 121 to the communication line 20.
Sent to 0. The sub-processor 112 monitors the signal state of the communication line via the analog receiver 122 and the input / output circuit 113 in parallel with the data transmission. By any chance
If the transmitted signal and the monitored signal do not match, a transmission error
And a transmission error is detected at a predetermined position in the shared memory 114.
Set the flag.

When transmission ends without error, the sub-processor 112 shifts to data reception. In the data reception, the sub-processor 112 monitors the signal state of the communication line via the analog receiver 122 and the input / output circuit 113 and reproduces the data bit sequence of the received data in the same manner as described above. Further, after confirming that the address data matches and there is no parity error, the sub-processor 112 writes the received data to the shared memory 114 as monitor data. At the same time, CPU 111
Generates a reception end interrupt. If an address mismatch or parity error is detected, the shared memory 114
Set a reception error flag at a predetermined position. CP
The U111 determines the reception error flag in response to the reception end interrupt, and if no error occurs, performs body control processing using the received monitor data.

FIG. 7 is a detailed block diagram of another embodiment of the sub-processor 3. In this embodiment, the sub processor 3
, A register 11a for storing a transmission destination and a transmission source,
11b, registers 12a and 12b storing control data and monitor data, shift registers 13a and 13b storing actual transmission data, a register 14 used for a timer counter, and a register 15 used for error detection and communication control. Is provided. The subprocessor uses these registers to execute a transmission control program and a timer counter program to perform transmission control. When recognizing the start of the received signal, the sub-processor counts up the timer counter register 14, detects the transmission signal in a fixed time, and determines bits "1" and "0". When the end of the received signal is recognized, the destination terminal and the monitor data are written into the registers 11b and 12b. At this time, if no error is detected, the CPU
The data b and 12a are read, and the destination and control data corresponding to the monitor data are written into the registers 11a and 12a. The sub-processor 3 creates transmission data from the register data, stores it in the register 13a, and starts transmission while synchronizing with the timer counter. Thereafter, the sub-processor 3 is again in a state of waiting for reception.

In this embodiment, the state of the headlight switch 301 connected to the terminal station 300 is processed by the CPU 111 as monitor data as described above.
That is, the CPU 111 operates the headlight switch 301.
Headlight 50 according to the monitor data indicating the state of
The control data for instructing turning on or off of the terminal 1 is transmitted to the terminal station 50.
Send to 0. At the same time, headlight status indicator 1
02 ON / OFF is controlled. Furthermore, key switch 1
The state of No. 01 is discriminated, and if the key is removed, control data for driving the alarm buzzer 401 is transmitted to the terminal station 400.

As described above, in the present embodiment, the body control processing is executed by the CPU 111 in accordance with the program stored in the ROM 115, and the communication processing required for this body control processing is performed in accordance with the program stored in the ROM 116 in accordance with the program. Executed by processor 112.

In this embodiment, the sub-processor 1 of the central office
Reference numeral 12 denotes centralized control of a communication system. However, the present invention is not limited to centralized control, and a communication system of a distributed processing system may be employed. For example, a microcomputer with a sub-processor built in both the central office and the terminal office
SAE, a distributed processing communication system
The J1850 communication system may be executed by the sub-processors of the central office and the terminal office.

FIG. 4 is a configuration diagram of a communication system according to a second embodiment of the present invention. In the present embodiment, the power module is transmitted from the engine control unit 600 via the communication line 601.
The control signal is transmitted to the console 620. In the present embodiment, the engine control unit 600 is installed in the vehicle interior and the power module
The engine is installed in the engine room near the engine, and both are connected by a communication line. Engine control unit 600 transmits ignition and fuel injection timing data and injected fuel amount data to power module 620 by serial transmission, and controls the engine by remote control. Therefore, the engine control unit 600 includes a microcomputer 601 having a built-in sub-processor and an analog-only I / O.
C602 is provided. This is similar to the central office 100 of the first embodiment. That is, the CPU 603 of the microcomputer 601 executes the engine control processing, and the sub-processor 604 controls the input / output circuit 605 and shares the communication processing. The analog dedicated IC 602 performs analog connection with a communication line and a peripheral load, and adjusts a signal level.

On the other hand, the power module 620 integrates a communication processing circuit 623, a load interface circuit 624, and a fuel injection / ignition control circuit 625 having the same functions as those of the terminal station 300 in the first embodiment. Dedicated LS
I621 is used. The communication method in this embodiment is the one-to-one communication method described in Japanese Patent Application Laid-Open No. Sho 59-230345.
Same as transmission. The fuel injection / ignition control circuit 625 receives transmission data from the engine control unit 600,
The control signal is converted into a control signal to be supplied to the fuel injector and the ignition plug. This control signal is output through the load interface circuit 624. The power element 622 power-amplifies the control output from the load interface circuit 624, and the fuel injection injector 626 and the spark plug 62
7 is driven. The failure state of the power element 622 is read by the load interface circuit 624 and returned to the engine control unit by the communication processing circuit 623.

According to this embodiment, the power element conventionally incorporated in the engine control unit can be placed in the engine room, and the engine control microcomputer and the vehicle interior equipment can be injected with fuel.・ It is easy to protect against strong radio noise caused by ignition. Further, in the conventional system, a large number of wirings are required for fuel injection and ignition control. However, according to the present embodiment, a small number of communication lines can be used, and the configuration of the engine control unit and the wiring in the vehicle can be greatly simplified. .

In this embodiment, the control actuator
Although the control signals for the ignition plug and the fuel injection igniter, which are the controllers, are transmitted via serial communication using a sub-processor, the reverse is also possible. That is, when serially transmitting a sensor signal from a hot-wire flow meter or the like that measures the air flow rate to the engine control unit, the sub-processor of the engine control unit may perform communication processing to receive the sensor signal. . Similarly, in the case of serial transmission of a sensor signal to a main body control unit in a navigation system or the like based on the present invention in a navigation system or the like, communication processing is executed by a sub-processor of the main body processing unit and the sensor signal is received. It is also possible.

FIG. 5 is a configuration diagram of a communication system according to a third embodiment of the present invention. In this embodiment, the engine control unit 700, the power module 710, the transmission control unit 720, and the external diagnostic device 730 are connected via communication lines 740, 741, 742.
The configuration of the engine control unit 700 is almost the same as the engine control unit of the second embodiment. That is, a microcomputer 701 with a built-in sub-processor is used, and an analog dedicated IC 705 for communication is installed outside the microcomputer 701. In the microcomputer 701, the CPU 702 executes the engine control, and the sub-processor 703 controls the input / output circuit 704 to share the communication processing.
This is exactly the same as the embodiment. In the case of the present embodiment, the communication line is 3
The second embodiment differs from the second embodiment in that the communication analog dedicated IC 705 has three circuits of analog drivers and receivers.

The configuration of the power module 710 is exactly the same as the power module 620 of the second embodiment. The transmission control unit 720 includes a microcomputer 721 for transmission control, and a communication LSI 722 for class C (AN82526 manufactured by Intel Corporation) as a communication processing device. The external diagnostic device 730 is connected to a computer 731 for diagnosis and an AC as a communication processing device.
IA732 (Hitachi HD6350).

The communication systems used for the three communication lines 740, 741, 742 are different from each other as described above. That is, the engine control unit 70 using the communication line 740
0 and the communication between the power module 710 and
The communication method described in JP-A-230345 is used. Communication between the engine control unit 700 and the transmission control unit 720 using the communication line 741 uses a class C communication method using Intel AN82526.
Engine control unit 700 using communication line 742
Communication with the external diagnostic device 720 using ISIA
The communication conforms to the O9141 standard.

The sub-processor 703 built in the microcomputer 701 executes the above three kinds of communication systems in parallel by a program. The microcomputer 701 (H8 / 570, HD6475 manufactured by Hitachi, Ltd.) used in this embodiment.
In the case of 708), the sub-processor can execute up to 12 programs simultaneously and in parallel. Therefore, if three types of communication processing are performed as in this embodiment, the multi-program can be executed without sacrificing the transmission speed so much. Execution is possible.

According to the present embodiment, even if another control unit having a different communication system is connected to the engine control unit 700 by various communication systems, the communication processor is not added to the engine control unit 700 and the sub processor It is possible to respond flexibly only by changing the program.

The engine control unit 700, the transmission control unit 720, and the external diagnostic device 7
The communication with the communication line 30 may be performed by executing two different communication methods in a time-division manner, so that the communication lines 741 and 742 may be unified. In this case, the number of wirings is reduced, and at the same time, the number of analog drivers and receivers of the communication analog IC 705 can be reduced to two circuits.

Further, in this embodiment, the engine power train control system by the engine control unit and the transmission control unit, and the serial data communication between the external diagnostic devices have been described. May be. Further, the present invention may be applied to an anti-lock brake system, suspension control, four-wheel drive control, or serial communication with a control unit of a vehicle control system such as four-wheel steering. The communication processing by the sub-processor is J1850.
The present invention is not limited to the contention bus system which requires arbitration of the data transmission right by the communication control of the distributed control system such as the system, and may be applied to a token system or a centralized bus system by polling. . According to the present embodiment, an arbitrary communication method can be applied to realize the communication processing by the program processing of the sub-processor.

FIG. 6 is a configuration diagram of a communication system according to a fourth embodiment of the present invention. In FIG. 6, the central office 800 includes a display control unit 810 and a terminal station 820,
821 and 822 and communication lines 830 and 831 for communication. The central office 800 is the central office 10 of the first embodiment.
0 and the microcomputer 80
1 has a CPU 802, a sub-processor 803, and an input / output terminal 804. In this embodiment, the central office 800 drives the two communication lines 830 and 831, so that the communication dedicated IC is used.
805 differs from the first embodiment in that it has two analog drivers and receivers.

The display control unit 810 controls the display 813. The display control unit 810 controls the image of the television image receiving circuit 814, the map output by the navigation unit 815, the current position of the vehicle, the air conditioner 816,
The screen for setting the operation of the audio device 817 is switched and displayed according to the operation input signal. The operation input signal is input from a touch panel 818 provided on the screen of the display 813. Further, the display unit 813 also displays the state of the body control or the failure information of the electrical equipment provided by the central office 800 by communication. For this reason, the display control unit 810 includes a microcomputer 811 and a communication LSI 812. The communication LSI 812 is manufactured by the American Automotive Engineers Association, S.A.-E-Paper No. 920229 (SAE Paper 92022).
9) It integrates a communication processing function corresponding to the communication system described in the above and a microcomputer interface.
The terminal stations 820, 821, 823 are exactly the same as the terminal stations 300, 400, 500 of the first embodiment.

The sub-processor 803 of the central office 800
Display control unit 810 and terminal station 820,
For communication with 821 and 822, the communication method described in the first embodiment is executed by a program for two lines simultaneously and in parallel. That is, two identical communication processing programs are simultaneously and concurrently executed by the sub-processor.
It goes without saying that the internal memory used by the sub-processor is distinguished in the two programs and is not confused.

According to the present embodiment, the central office 800 that executes the body control can be simply displayed by the display control unit 810.
Can be connected by communication, so that the state of the body control or the failure information of the electrical equipment can be easily displayed on the display. The present invention will be described based on each of the above-described embodiments.
The explanation is as follows. The subprocessor is an input / output terminal
Control and determine the child's logical state. That is, data transmission
The transmission data is transmitted using the output control instruction of the subprocessor.
1 or 0 (High or Lo) according to the bit pattern of
Outputs the logic state of w). In data reception,
The received data bit is transmitted using the input discriminating instruction of the processor.
Turn 1 or 0 (High or Low) logic state
Determine. This subprocessor operation is independent of the CPU operation.
It is executed in parallel. Therefore, CPU communication control
The processing does not impose a software load on the CPU. Also,
The communication processing operation of the sub processor is stored in the memory described above.
It is determined by the program. Therefore, program change
Further, various communication systems can be realized. In addition,
The controller controls and determines multiple input / output circuits simultaneously in parallel.
it can. Therefore, a plurality of communication systems can be connected to one sub-processor.
Can be processed simultaneously. CPU and sub-processor
The sensors are connected inside the microcomputer and communicate
Computer bus outside the microcomputer for processing
There is no need to output on some printed circuit boards. For this reason,
Can suppress electromagnetic radiation from computer bus
You.

[0047]

According to the present invention, a plurality of different communication methods are provided.
A memory for storing a transmission control program of the
Transmission control of these different communication systems by the processor
Multiple control units and rear
Communication that can be performed in real time, suitable for automobiles
Processing was realized.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a vehicle control vehicle communication system according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a central station of the vehicle control vehicle communication system according to the first embodiment of the present invention.

FIG. 3 is a configuration diagram of a terminal station of the vehicle communication system for body control according to the first embodiment of the present invention.

FIG. 4 is a configuration diagram of a vehicle communication system for engine control according to a second embodiment of the present invention.

FIG. 5 is a configuration diagram of a vehicle communication system connecting an engine control unit, a transmission control unit, and an external diagnostic device according to a third embodiment of the present invention.

FIG. 6 is a configuration diagram of a communication system for a vehicle connecting body control and display control according to a fourth embodiment of the present invention.

FIG. 7 is a detailed configuration diagram of a sub-processor.

[Explanation of symbols]

100: central processing unit, 200: communication line, 300, 40
0,500 terminal station, 110 microcomputer with built-in sub-processor, 1,111 CPU, 3,112
Sub processor, 113 input / output circuit, 114 shared memory, 115, 116 ROM, 120 dedicated analog IC, 121 analog driver, 122 analog receiver, 123 level converter, 310 dedicated LS
I, 311: communication processing circuit, 312: load interface
Su.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tatsuya Yoshida 2520 Takada, Katsuta-shi, Ibaraki Pref. References JP-A-61-188652 (JP, A) JP-A-5-101006 (JP, A) JP-A-1-191194 (JP, A) JP-A-62-186857 (JP, A) JP-A-61-286857 JP-A-255461 (JP, A) JP-A-63-231042 (JP, A) JP-A-4-105012 (JP, A) JP-A-2-196164 (JP, A) JP-A-2-71877 (JP, U) )

Claims (3)

(57) [Claims] 1. A microcomputer having a CPU, a sub-processor, and a memory for storing a plurality of transmission control programs of different communication systems, and a first analog having an analog-only IC having a plurality of drivers and receivers.
A control unit, a second control unit for driving a body electrical device of the vehicle, a third control unit including a microcomputer and a communication control circuit different from the microcomputer of the first control unit, and the first control unit And a communication line for transmitting a signal between the first control unit and the second control unit; and a communication line for transmitting a signal between the first control unit and the third control unit. The CPU obtains data for controlling the body electric device by a program operation, and the sub-processor of the first control unit processes a plurality of different transmission control programs stored in the memory of the first control unit in parallel. The first control unit and the second control unit or the third control unit are connected by the communication lines via the analog dedicated IC. An automotive communication system for performing communication processing with a control unit. 2. A microcomputer comprising a CPU, a sub-processor and a memory for storing a plurality of transmission control programs of different communication systems, and an engine control unit having an analog-only IC having a plurality of drivers and receivers. An external diagnostic device; a transmission control unit including a microcomputer and a communication control circuit different from the microcomputer of the engine control unit; and a communication for transmitting a signal between the engine control unit and the external diagnostic device. And a communication line for transmitting a signal between the engine control unit and the transmission control unit. The sub-processor of the engine control unit includes a plurality of different processors stored in a memory of the engine control unit. Transmission control program A communication system for an automobile, wherein the communication processing is performed between the engine control unit and the external diagnostic device or the transmission control unit through the analog dedicated IC and the respective communication lines. 3. An analog-only I / O having a CPU, a sub-processor, a memory for storing a plurality of transmission control programs of different communication systems, and a plurality of drivers and receivers.
C, wherein the sub-processor performs parallel processing of the plurality of different transmission control programs and performs communication processing with a plurality of control units via a plurality of transmission lines connected to the analog-only IC. A control unit for a communication system for a vehicle, wherein the control unit executes: