JPH06282455A - Method for communication between electronic control unit and adjusting device - Google Patents

Abstract

PURPOSE:To preclude malfunction due to the effect of a noise by decreasing the number of signal lines for parallel communication. CONSTITUTION:This method is equipped with the electronic control unit(ECU) which has an >=8-bit CPU 11 and the adjusting device 2 which debugs the storage contents of its memory part (RAM) 13 for monitoring, etc. System buses whose number of buses is an integral multiple of 4 among data buses as many as the bits of the CPU 11 are connected to the adjusting device 2 and when signals are written and read between the ECU1 and adjusting device 2 through those system buses, they are written and read divisionally more than twice.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication method between an electronic control unit and an adjusting device for debugging the stored contents of its memory section.

[0002]

2. Description of the Related Art Generally, an electronic control unit (ECU) used for automobiles, home electric appliances and the like has a CPU and a ROM and a RAM as a memory section. When developing this ECU, it is necessary to perform debugging such as rewriting ROM contents (control data etc.) or monitoring RAM contents (temporarily used control variables etc.). In particular, in the case of an ECU used for automobile engine control, ABS control, etc., it is necessary to record the correlation between the behavior of the automobile and the control program in real time for further consideration. In recent years, various types of ECU adjustment devices have been proposed and put into practical use.

By the way, in the conventional communication system between the ECU and its adjusting device, since the transfer rate and the circuit change of the ECU are small, the system bus (address bus, data bus and control of the CPU in the ECU). bus)
The parallel communication method using is common.

[0004]

However, in the above-mentioned conventional communication system, since the system bus of the CPU is routed to the adjustment device connected to the ECU, errors such as crosstalk and timing deviation may occur due to the influence of noise. There is a problem that it easily occurs. Especially, the number of bits is large (1
In the case of (6, 32 bits) CPU, this problem is remarkable because the number of signal lines corresponding to the number of bits of the CPU is connected to the outside only by the data bus.

The present invention has been made in view of the above circumstances, and an object thereof is to improve a communication method between an ECU and an adjusting device to prevent occurrence of malfunction due to influence of noise. It is in.

[0006]

In order to achieve the above object, in the invention according to claim 1, an electronic control unit having a CPU of 8 bits or more and an adjusting device for debugging the stored contents of the memory part thereof are provided. As a communication method between them, among the system buses of the above-mentioned CPU, a number of system buses that is an integer multiple of 4 are connected to the adjusting device, and signals are read and written between the electronic control unit and the adjusting device through these system buses. When performing the above, it is configured so as to be performed twice or more.

The invention according to claim 2 is dependent on the invention according to claim 1, and specifically shows an adjusting device as a component thereof. That is, the adjusting device monitors the stored contents of the memory section of the electronic control unit.

The inventions according to claims 3 and 4 are both dependent on the invention according to claim 2, and when a signal is read and written between the electronic control unit and the adjusting device for monitoring, the communication time is increased. The communication procedure is improved to shorten it.

That is, according to the third aspect of the invention, the step of sequentially sending the monitor address signals for the number of channels from the adjusting device side to the electronic control unit side at the time of the first sampling, and the electronic control based on the monitor address signal are carried out. After sending the data sending signal from the unit side to the adjusting device side, sequentially sending the monitor data signals for the number of channels, and without being based on the monitor address signal from the adjusting device side during the second and subsequent sampling, After the data transmission signal is transmitted from the electronic control unit side to the adjustment device side, monitor data signals for the number of channels are sequentially transmitted.

Further, in the invention according to claim 4, the monitor channels are divided into groups according to the degree of change of the monitor elements, and the higher the degree of change of the monitor elements, the higher the sampling rate of the group.

[0011]

With the above construction, in the invention according to claim 1,
Communication between the electronic control unit and the adjusting device is performed by using a system bus of an integral multiple of 4 among the system buses of the CPU, and the number of communication signals is reduced,
The generation of noise is suppressed accordingly.

According to the third aspect of the present invention, when the adjustment device monitors the storage contents of the memory section of the electronic control unit by reading and writing signals between the electronic control unit and the adjustment device, the second and subsequent times are performed. Without sending the monitor address signal from the adjusting device side at the time of sampling, the electronic control unit side immediately sends the data sending signal,
Since the monitor data signals for the number of channels are sequentially transmitted, the communication time is shortened by the time required for transmitting / receiving the monitor address signal.

According to a fourth aspect of the present invention, when a signal is read and written between the electronic control unit and the adjusting device to monitor the contents stored in the memory section of the electronic control unit by the adjusting device, the monitor channel is a monitor channel. It is divided into groups according to the degree of change of elements, and the higher the degree of change of monitor elements, the higher the sampling rate of that group, so without degrading the monitor accuracy,
The number of times of sampling or communication can be reduced as much as possible.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a communication device for using the communication method according to the first embodiment of the present invention, which transmits and receives signals between an electronic control unit (ECU) 1 and an adjusting device 2. It is performed by parallel communication.

The ECU 1 includes a CPU 11, a ROM (read only memory) 12 as a memory unit, and an R.
An AM (random access memory) 13 and a connection connector 14 are built in. The CPU 11 is of a 16-bit type and is set to the extended bus mode, and its address bus 15, data bus 16 and control bus 17 are all connected to the ROM 12, RAM 13 and connection connector 14, respectively. The ROM 12 has E
A control program of CU1, control data, and a RAM monitor program (a monitor service routine described later) are stored. The RAM 13 stores control variables used temporarily by the CPU 11 for control, and
It is used as a work area for calculation.

The connection connector 14 is for connecting to the adjusting device 2 side via a cable 31, and the connection connector 14 has an address bus 15, a data bus 16 and a control bus 17 from the CPU 11.
Are connected respectively. Here, the CPU 11
Since it is a 6-bit type, it has 16 data buses 16 and all 16 data buses 15 are connected between the CPU 11 and the ROM 12 and the RAM 13. However, as a feature of the present invention, the CPU 11 is connected. Between the connector 14 and half of the 16 data buses 15, 8 are connected.

On the other hand, the adjusting device 2 has a RAM monitor function for monitoring the contents stored in the RAM 13 of the ECU 1, and includes a control command unit 21, a RAM monitor control unit 22, a RAM monitor collecting unit 23, and a RAM monitor. The display unit 24 and the connection connector 25 are provided.

The control command section 21 outputs a control command to the RAM monitor control section 22 in response to a request (including operation) from a user or the like. The RAM monitor controller 22
Receives the command from the control command unit 21, and controls the RAM monitor collection unit 23 and the RAM monitor display unit 24. Also,
The RAM monitor collection unit 23 is the RAM monitor control unit 2
The control command No. 2 is received and the RAM monitor data input through the connector 25 is collected. After that, the monitor data is sent to the RAM monitor control unit 22. R above
The AM monitor display unit 24 displays the monitor data sent from the RAM monitor control unit 22 on the screen in real time.

Further, the connection connector 25 is an ECU.
1 for connecting via the cable 31, the connection connector 25, the RAM monitor controller 22 and R
The AM monitor collecting unit 23 is connected to the AM monitor collecting unit 23 via an address bus 26, a data bus 27, and a control bus 28, which are three types of system buses, so that signals can be exchanged between them.
Here, the number of data buses 27 is the CPU of the ECU 1 side.
Data bus 16 between 11 and connector 14
The number is set to 8 as well.

Then, the connector 1 on the ECU 1 side
4 and the connector 25 on the adjusting device 2 side are connected to the cable 3
1 is connected by parallel communication so that transmission and reception is possible.
The cable 31 constitutes a part of the system bus, and eight signal lines for the data bus are provided. The communication between the ECU 1 and the adjustment device 2 is performed while handshaking.

Next, the operation of the communication device will be described separately for the adjusting device 2 side and the ECU 1 side.

First, to explain the operation of the adjusting device 2,
When there is a monitor command (request) from the user, the ECU 1 is instructed to send the monitor data. When data is sent from the ECU 1, the monitor data is displayed on the RAM monitor display unit 24 in real time. The operation sequence will be described in detail below.

That is, first, when there is a monitor request from the user, the control command section 21 specifies the monitor information (the number of monitor channels, the address, the attribute (byte or word)), and the RAM monitor control section 22. Send out.

Based on the monitor information, the RAM monitor control section 22 commands the RAM monitor collection section 23 to issue a monitor start / end command, the number of monitor channels, and the address and attribute of each channel.

The RAM monitor collecting unit 23 is connected to the ECU via the system bus, particularly the data buses 27, 31, and 16.
1 and a predetermined protocol. The communication starts with the monitor start command, and the communication with the ECU 1 is repeatedly performed until the monitor end command is sent. Monitor data is sent from the ECU 1 and is temporarily stored in the memory of the RAM monitor collection unit 23.

Further, the RAM monitor control section 22 sends information of the display data (the number of channels, attributes, etc.) to the RAM monitor display section 24 before displaying the monitor data. Then, the monitor data of the RAM monitor collection unit 23 is read and the data is sent to the RAM monitor display unit 24. RA
The M monitor display unit 24 displays the data on the screen in real time in a predetermined format based on the information of the display data.

Next, the operation of the ECU 1 side, particularly the communication with the adjusting device 2 side will be described. The communication with the adjusting device 2 side is performed by the system bus, particularly the data buses 16, 31 and 2.
7 and sends monitor data (contents stored in the RAM 13). This communication is performed according to a monitor service routine shown in FIG. 2, which is a predetermined protocol (flow). The monitor service routine will be described below.

The flow shown in FIG. 2 is a method of monitoring the contents of the RAM 13 at the address designated by the adjusting device 2 by communicating while the ECU 1 side and the adjusting device 2 side take steps in a software manner (handshake). is there. For communication, a common address called a device address (XX00 to XX02, XX can be arbitrarily set) is provided, and communication is performed using this address as a window.

In FIG. 2, after starting, the device address XX02 is first read in step S1, and the device address XX02 is read in step S2.
It is determined whether or not the value of bit 7 of is "0". This bit 7 is for checking the connection state with the adjusting device 2. When the value is "0", it indicates connection, and when it is "1", it indicates non-connection.

Then, when the above judgment is NO, the process returns as it is, while when the judgment is YES, it returns.
In steps S3 and S4, the device address XX00, which is the monitor address, is read in two times, the upper address and the lower address, and then in steps S5 and S6, the contents (monitor data) of the RAM 13 corresponding to the monitor address are divided. The upper byte and the lower byte are written to the address XX01 separately in two times and sent to the adjusting device 2 side. It should be noted that the read and write operations are performed in two steps separately for the 16-bit CPU 11 and the parts (CPU 11 etc.) on the ECU 1 side through the eight data buses 16, 31, 27, which is half the number of bits. This corresponds to the connection with the parts on the adjusting device 2 side (such as the RAM monitor collecting unit 23).

Subsequently, the device address XX02 is read again in step S7, and it is determined in step S8 whether the value of bit 0 of the device address XX02 is "1". This bit 0 is for checking the presence or absence of the next channel. When the value is "0", it indicates that there is no channel, and when it is "1", it indicates that there is a channel.

Then, steps S3 to S6 are repeated until the above determination is NO, that is, until the next channel is exhausted, thereby sending monitor data for the number of channels to the adjusting device 2 side. Then return.

Therefore, in the first embodiment described above,
ECU 1 having 16-bit CPU 11 and adjusting device 2
When performing parallel communication with the data bus 16, the data buses 16, 27 and 31 having half the number of bits of the CPU 11 are used to connect the data buses 1 and 2 and these data buses 16, 27 and 3 are connected.
Since 1 sampling and writing / reading of signals per channel between 1 and 2 are performed twice through 1, the total number of communication signals (corresponding to the total number of system buses) is possible. Can be reduced to
Therefore, the noise can be suppressed and the monitoring can be performed accurately.

3 to 6 show E as a second embodiment of the present invention.
It shows a modified example of a protocol, that is, a communication method when parallel communication is performed between the CU and the adjustment device. 3 and 4 show a monitor routine which is a protocol on the adjusting device side, and FIGS. 5 and 6 show a monitor service routine which is a protocol on the ECU side.
The configurations of the ECU, the adjustment device, and the communication device between them are exactly the same as those in the first embodiment, and the same reference numerals are used for these components in the following description.

In FIGS. 3 and 4, after the start,
First, in step S11, the connection data 80h, which means the connection with the ECU 1, is written in the device address XX02 and sent to the ECU 1 side. Then, step S12
In step S13 and S14, the monitor address is written to the device address XX00 separately in two steps, that is, the upper address and the lower address, and it is determined whether or not the ECU 1
Send to the side. Then, in step S15, after confirming that the writing of the monitor addresses of all the channels is completed, the process proceeds to step S16. On the other hand, the above step S12
When the determination is NO, that is, when the second and subsequent samplings are performed instead of the first sampling, the step S is immediately executed.
Move to 16.

In step S16, the device address XX
01 is read to obtain data transmission information from the ECU 1 side. Then, in steps S17 and S18, the device address XX01 is read, the monitor data (the upper data and the lower data for two times) sent from the ECU 1 side is obtained, and the data is read based on the previous data sending information.
It is stored in the AM monitor collection unit 23.

Then, in step S19, it is determined whether or not the collection of the monitor data of all the channels is completed. If the determination is NO, in the step S20, the collection of intermediate data indicating that the collection of the monitor data of all the channels is being completed. After writing 01h to the device address XX02, the process returns to step S17. On the other hand, if the determination is YES, in step S21, the collection end data 00h, which means the end of the collection of the monitor data of all channels, is given as the device address XX02.
After writing to, it is determined in step S22 whether the command from the control command unit 21 is to end the monitoring.
If the determination is NO, the process returns to step S11, while if the determination is YES, the control ends.

In FIGS. 5 and 6, after the start,
First, in step S31, the device address XX02 from the adjustment device 2 side is read, and in step S32, it is determined whether or not the value of the device address XX02 is the connection data 80h. When the determination is NO, the routine returns as it is, while when the determination is YES, it is determined in step S33 whether or not the sampling is the first sampling.

When the determination in step S33 is YES, the device address XX00, which is the monitor address from the adjusting device 2 side, is read in two steps, the upper address and the lower address, in steps S34 and S35, and then the step S36. Then, this read address is sequentially added to ADDTB.
Store in L. Then, after confirming that the reading of the monitor addresses of all the channels is completed in step S37, the process proceeds to step S38. On the other hand, the above step S33
When the determination is NO, that is, when the second and subsequent samplings are performed instead of the first sampling, the step S is immediately executed.
Move to 38.

In step S38, the data transmission information is written in the device address XX01 and transmitted to the adjusting device 2 side. Then, in steps S39 and S40, the ADDTB is added.
The contents (monitor data) of the RAM 13 at the address indicated by L are sequentially written into the device address XX01 in two steps, the upper byte and the lower byte, and sent to the adjusting device 2 side.

Then, in step S41, after confirming that the transmission of the monitor data of all the channels is completed, in step S42 the device address XX02 is read again,
In step S43, it is determined whether the value of the device address XX02 is the collection end data 00h. If the determination is YES, the process returns. On the other hand, if the determination is NO, the process returns to step S33 to continue sending the monitor data.

ECU 1 based on such a protocol
In the case of communication between the adjustment device 2 and the adjustment device 2, monitor address signals for the number of channels are sequentially sent from the adjustment device 2 side to the ECU 1 side at the time of the first sampling, and the ECU 1 side adjusts based on these monitor address signals. After the data transmission signal (information) is transmitted to the device 2, the monitor data signals for the number of channels are sequentially transmitted. On the other hand, during the second and subsequent samplings, after the data transmission signal is transmitted from the ECU 1 side to the adjustment device 2 side, the monitor data signals for the number of channels are not transmitted based on the monitor address signal from the adjustment device 2 side. It is sent out sequentially. Therefore, the time required for transmitting and receiving the monitor address signal during the second and subsequent samplings can be omitted, and the communication time can be shortened accordingly.

Further, as in the case of the first embodiment, the CPU
The data buses 16, 27, 31 having half the number of bits of 11 are used to connect both 1, 2 and
1 sampling between 1 and 2 through 27 and 31
Since the writing and reading of signals for each channel are performed twice each, the total number of communication signals can be reduced as much as possible to suppress noise generation, and accurate monitoring can be performed. Of course, it has the effect of being able to do so.

7 to 9 show E as a third embodiment of the present invention.
It shows another modified example of the protocol when the communication between the CU and the adjustment device is performed by parallel communication. 7 and 8 show a monitor routine which is a protocol on the adjusting device side, and FIG. 9 shows a monitor service routine which is a protocol on the ECU side. The configurations of the ECU and the adjusting device are exactly the same as those in the first embodiment, and the same reference numerals are used for these components in the following description.

7 and 8, after the start,
First, in step S51, the monitor channels are divided into three groups of high speed, medium speed, and low speed. The high-speed group includes monitor elements that have a high degree of change in monitor elements and require processing or interrupt processing at time intervals of 5 ms or less. The medium speed group includes monitor elements that have a moderate degree of change in the monitor elements and that require processing at time intervals within 5 to 20 ms. The low speed group includes monitor elements that have a low degree of change in the monitor elements and that can be processed in a time interval of 20 ms or more. For example, in the case of an automobile engine control ECU, the engine speed, the intake flow rate, the ignition timing, etc. are included in the high speed group, and the elements operated by the driver such as the accelerator depression degree and the engine mode switching are included in the medium speed group, Intake gas temperature, water temperature, etc. are included in the low speed group. Then, the high speed group is set to the address table Tf and the medium speed group is set to the address table Tf.
The low speed group is set in m and the low speed group is set in the address table Ts.

Subsequently, in step S52, the connection data 80h, which means the connection with the ECU 1, is set to the device address XX.
02, and sends it to the ECU 1 side, and then the step S
At 53, the previous sample flag Fo is read and the current sample flag F is set as follows. That is, if the previous sample flag Fo is high, the current sample flag F is set to medium speed, if the previous sample flag Fo is medium speed, the current sample flag F is set to low speed, and the previous sample flag Fo is low. For example, the sample flag F is set at high speed this time.

Succeedingly, in a step S54, it is determined whether the present sample flag F is high speed, medium speed or low speed. If the sampling flag F is low this time, a value obtained by adding the number of monitor channels to each of the high-speed group, medium-speed group, and low-speed group is set in step S55, and the monitor address table T is set to the above three values in step S56. The value of each address table Tf, Tm, Ts of one group is set. If the sampling flag F this time is medium speed, a value obtained by adding the number of monitor channels to the number of each of the high speed group and the medium speed group is set in step S57, and in step S58, the above two groups are set in the monitor address table T. The values of the respective address tables Tf and Tm are set. Further, when the sampling flag F is high speed this time, the number of monitor channels is set to the value of the number of high speed groups only in step S59, and the value of the address table Tf of only high speed groups is set to the monitor address table T in step S60. To do.

Thereafter, in steps S61 and S62, the monitor address is written to the device address XX00 in two steps, that is, the upper address and the lower address, and the ECU 1
Send to the side. Then, in steps S63 and S64, the device address XX01 is read, monitor data sent from the ECU 1 side (two times of upper data and lower data) is obtained, and data is collected by the RAM monitor based on the data sending information. It is stored in the unit 23.

Subsequently, in step S65, it is determined whether or not the collection of the monitor data of all channels is completed. When the determination is NO, in step S66 the in-collection data which means that the monitor data of all channels is being collected. After writing 01h to the device address XX02, the process proceeds to step S69. On the other hand, if the determination is YES, in step S67, the collection end data 00h, which means the end of the collection of the monitor data of all channels, is set to the device address XX.
After writing to 02, the current sample flag F is substituted for the previous sample flag Fo in step S68 to update the previous sample flag Fo, and the process proceeds to step S69. Then, in step S69, it is determined whether or not the command from the control command unit 21 is to end the monitoring. If the determination is NO, the process returns to step S52, while the determination is YES.
If, the control ends.

In FIG. 9, after starting, first, in step S71, the device address XX02 is read, and in step S72, the device address XX02 is read.
It is determined whether the value of is the connection data 80h. When this determination is NO, the process returns without any operation, while
When the determination is YES, in steps S73 and S74, the device address XX00, which is the monitor address, is read in two times, the high-order address and the low-order address, and then, in steps S75 and S76, the RAM 13 corresponding to the monitor address is read. The contents (monitor data) are written into the device address XX01 in two steps, that is, the upper byte and the lower byte, and sent to the adjusting device 2 side.

Then, in step S77, the device address XX02 is read again, and in step S78 it is determined whether or not the value of the device address XX02 is the collection end data 00h. If the determination is NO, the process returns to step S73, while if the determination is YES, the process returns.

ECU 1 based on such a protocol
In the case of communication between the adjusting device 2 and the adjusting device 2, the adjusting device 2 (R
The AM monitor control unit 22) divides the monitor channels into three groups of high speed, medium speed, and low speed according to the degree of change of monitor elements. Then, at the time of the first sampling, the monitor channels of all the groups of high speed, medium speed, and low speed are sent to the ECU 1 side as monitor address signals, and correspondingly, the monitor data for all the channels is sent from the ECU 1 side to the adjusting device 2 (RAM). Monitor collecting unit 23)
Entered in. Also, during the second sampling, the monitor channels of the high-speed and medium-speed groups are sent to the ECU 1 side as monitor address signals, and E
Monitor data for the number of monitor channels in the high-speed and medium-speed groups is input to the adjusting device 2 from the CU1 side. At the time of the third sampling, only the monitor channels of the high speed group are sent to the ECU 1 side as monitor address signals, and correspondingly, the monitor data for the number of monitor channels of the high speed group is input to the adjusting device 2 from the ECU 1 side. The above is repeated in the fourth and subsequent samplings. Therefore, the number of times the monitor data is sampled can be reduced as much as possible without lowering the monitor accuracy, and the communication time for monitoring can be shortened.

The present invention is not limited to the above-mentioned first to third embodiments, but includes various other modifications. For example, in each of the above embodiments, the RA of the ECU 1 is
Although the case of monitoring the content of M13 has been described, the present invention can be similarly applied to the communication method between the ECU and the adjustment device that performs other debug processing such as changing the content of R0M12 of the ECU 1. Of course you can.

In each of the above embodiments, the present invention is
The case where the invention is applied to the communication method between the ECU 1 having the bit CPU 11 and the adjusting device 2 has been described, but the invention is not limited to this, and is also applied to the communication method between the ECU having the 8-bit CPU and the adjusting device. can do. In short,
Of the system buses such as the CPU data bus, an integer multiple of 4 system buses are connected to the adjusting device, and signals are written and read between the ECU and the adjusting device through these system buses. It only has to be done twice or more.

[0056]

As described above, according to the communication method between the electronic control unit and the adjusting device in the present invention, the communication is performed using the system buses of the integral multiples of 4 among the system buses of the CPU. Since this is performed, the number of communication signals can be reduced as much as possible to suppress the generation of noise, and malfunctions can be prevented.

Particularly, according to the third aspect of the invention, when the adjustment device monitors the stored contents of the memory section of the electronic control unit by transmitting and receiving a signal between the electronic control unit and the adjustment device, It is necessary to send and receive the monitor address signal because the electronic control unit side immediately sends the data sending signal and sends the monitor data signal for the number of channels sequentially without sending the monitor address signal from the adjusting device side at the time of subsequent sampling. There is also an effect that the communication time can be shortened by the time.

According to the method of use in the invention of claim 4, when a signal is transmitted and received between the electronic control unit and the adjusting device and the adjusting device monitors the stored contents of the memory section of the electronic control unit. , The monitor channels are divided into groups according to the degree of change of the monitor element, and the higher the degree of change of the monitor element, the higher the sampling rate of the group, so that the number of samplings or communication Also, there is an effect that the communication time can be shortened by that amount as much as possible.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of a communication device for using a communication method according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing a monitor service routine.

FIG. 3 is a flowchart showing a monitor routine according to a second embodiment of the present invention.

FIG. 4 is a flowchart of the same.

FIG. 5 is a flowchart showing a monitor service routine.

FIG. 6 is a flowchart of the same.

FIG. 7 is a flowchart showing a monitor routine according to a third embodiment of the present invention.

FIG. 8 is a flowchart of the same.

FIG. 9 is a flowchart showing a monitor service routine.

[Explanation of symbols]

 1 Electronic Control Unit (ECU) 2 Adjustment Device 11 CPU 13 RAM (Memory Unit) 16, 27 Data Bus (System Bus) 31 Cable (System Bus)

Claims (4)

[Claims] 1. A method of communication between an electronic control unit having a CPU of 8 bits or more and an adjusting device for debugging the stored contents of a memory section thereof, wherein an integer of 4 in the system bus of the CPU. It is characterized in that a double number of system buses are connected to the adjusting device, and when writing and reading signals between the electronic control unit and the adjusting device through these system buses, each is performed twice or more. A communication method between the electronic control unit and the adjusting device. 2. The communication method between the electronic control unit and the adjusting device according to claim 1, wherein the adjusting device monitors a stored content of a memory section of the electronic control unit. 3. A step of sequentially sending monitor address signals for the number of channels from the adjusting device side to the electronic control unit side at the first sampling, and based on the monitor address signal, the electronic control unit side sends the adjusting device side to the adjusting device side. , The step of sequentially sending the monitor data signals for the number of channels after sending the data sending signal, and the electronic control unit side to the adjusting device side without being based on the monitor address signal from the adjusting device side during the second and subsequent samplings. The method of communication between the electronic control unit and the adjusting device according to claim 2, further comprising the step of sequentially transmitting monitor data signals for the number of channels after transmitting the data transmission signal. 4. The electronic control unit and the adjusting device according to claim 2, wherein the monitor channels are divided into groups according to the degree of change of the monitor elements, and the higher the degree of change of the monitor elements, the higher the sampling rate of the group. Method of communication between.