JPS61281303A - External supervisory and control equipment for electronic control type internal-combustion engine equipment - Google Patents

Abstract

PURPOSE:To change easily a control mode by storing in advance a program of the control mode to be forecast, in a program memory of a microcomputer, and selecting it by a signal from an external supervisory and control equipment. CONSTITUTION:An electronic control type internal-combustion engine equipment 1 is provided with an internal-combustion engine 2 and an operation control unit 3 having a digital microcomputer 4, and by this unit 3, the internal-combustion engine 2 is controlled. Also, an external supervisory and control equipment 7 which is a separate body from the equipment 1 and consists of an external control unit 5 and an input/output device 6 is provided so that its control state can be supervised and controlled. In this state, from the control unit 3 side, necessary information is sent out as the first series data to which an identification code has been affixed, and displayed on an indicator 9 by a real time. Also, to an input data from the data input device 6, an identification data for indicating a control mode of the internal-combustion engine 2 is affixed, it is sent to the control unit 3, the control mode is changed, etc. by the microcomputer 4, and a control of the internal-combustion engine 2 is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electronically controlled internal combustion engine device which is particularly suitable for performing characteristic tests of electronically controlled internal combustion engine devices configured using a microcomputer. This invention relates to an external monitoring and control device.

(Prior Art) In recent years, electronically controlled internal combustion engine devices (KLI) have been widely put into practical use to electronically control the operation of various internal combustion engines using digital microcontrollers.

Therefore, all of the control is performed based on calculations using digital data within the micro combinator.
When checking or changing the key control status for maintenance, inspection, repair or adjustment of control characteristics, it is necessary to read or change the control data in the micro combinator.

However, since such work is not easy, the present applicant has developed a configuration that can receive serial data with a predetermined identification code attached to the control data in the control device, thereby making it possible to display the contents of the desired control data. proposed a data monitoring device (Japanese Unexamined Patent Publication No. 59-81708).

(Problems to be Solved by the Invention) Since the proposed conventional device only has the desired f-time display function, it is difficult to design a control device for electronically controlling an internal combustion engine. If it becomes necessary to replace the program memory of the electronic control unit or switch the memory area when conducting an experiment to determine the optimal control method consisting of an optimal control f-tater or checking the electronic control system, the engine Operation must be interrupted.

However, if engine operation is interrupted during such an experiment, the values of the four parameters of engine operation (for example, cooling water temperature, etc.) will change during the interruption, resulting in incorrect data. This has the drawback that not only can it not be possible to obtain the desired results, but also the work efficiency must be reduced.

Therefore, an object of the present invention is to enable not only monitoring of control data of an electronically controlled internal combustion engine but also to change the control mode of the electronically controlled internal combustion engine from the outside without stopping the operation of the engine. An object of the present invention is to provide an external monitoring and control device for an electronically controlled internal combustion engine device.

(Ninth Means for Solving the Problems) The present invention has a configuration in which the operation of an internal combustion engine device is electronically controlled by a control unit including an f-digital computer. In an external monitoring and control device for an electronically controlled internal combustion engine device in which the control status of the electronically controlled internal combustion engine device can be monitored and controlled from the outside, required digital data in the control unit is coded with a required identification code. The first series f
means for identifying and receiving the first serial data according to its identification code; means for converting the received data into a corresponding analog signal through real-time processing and outputting the same; A display means for displaying the contents of the analog signal in response to the signal, a data input device, and a predetermined identification code for switching the control mode executed by the control unit according to the output data from the data input device. The present invention is characterized in that it includes means for transmitting second serial data, and means for changing the control mode of the control unit in response to the second serial data.

(Effect 0) Necessary information is sent from the control unit as the first serial data with an identification code and displayed in real time. Therefore, the contents of the required control data of the internal combustion engine device can be immediately known. On the other hand, identification data indicating the control mode of the internal combustion engine by the control unit is attached to the input data from the f-tactor input device, and the data indicating the control mode and the data indicating the control amount are transmitted to the control unit. The microcomputer in the 0 control unit that is sent controls the internal combustion engine according to these data, so switching control modes and changing control data can be done extremely easily without stopping the operation of the internal combustion engine. .

(Embodiment) FIG. 1 shows a schematic configuration diagram of an embodiment of an external monitoring and control device for an electronically controlled internal combustion engine device according to the present invention. The electronically controlled internal combustion engine device indicated by reference numeral 1 includes an internal combustion engine 2 and an operation control unit 3 including an f-digital microcomputer 4, and the operation control unit 3 controls the operation of the internal combustion engine 2. is configured to be performed electronically. In order to be able to monitor and control the operation control state of the electronically controlled internal combustion engine device 1 from the outside,
An external monitoring and control device 7 is provided which is separate from the internal combustion engine device 1 and includes an external control unit 5 and an input/output device 6.

The necessary digital data in the f inotal microcomputer 4 in the operation control unit 3 is the source of that data.
The data is converted into a serial data with an identification code indicating the class, and is serially transmitted to the external control unit 5 via the data line 8. The serial data is formed according to a predetermined data format, and after being converted into parallel data in the external control unit 5, it is stored in a predetermined area in the data memory in the external control unit 5 based on its identification code. . As explained based on FIG. 2, a micro combinator is provided in the external control unit 5, and data processing control is executed by this micro combinator.

The data in the operation control unit 3 taken into the external control unit 5 as described above is displayed on the display 18 in the external control unit 5, and a part of the data is transmitted via the data line 14. The data is sent to the input/output device 6, and the data content is displayed on the display 9 of the input/output device 6. The external control unit 5 displays the result from the f value indicating the failure state by the failure indicator lamp group 10, and converts each data into analog format by the A/D converter, and outputs it to the output terminal 111. to 11. It is configured so that it can be output as well.

The input/output device 6 further includes an f-key 12 for inputting control data as hexadecimal data, and a command key 1 for inputting identification code data indicating the type of control data.
3. In response to the operation of the r-key 12 and the command key 13, control command data for controlling the operation control unit 3 is sent to the external control unit 5 via the data line 15, where required identification data is transmitted. The attached serial data is created. This serial data is transmitted to the operation control unit 3 via the data line 16, and from this K, the operation control mode of the internal combustion engine 2 can be changed and the control amount can be arbitrarily set without interrupting the operation of the internal combustion engine 2. can be done. Note that the control amount is set by adjusting the control amount setting device 17 of the external control unit 5.

FIG. 2 shows a detailed block diagram showing the circuit configuration of the external monitoring and control device 7 described above. The serial data output port 4m and serial input port 4b of the digital microcomputer 4 are connected to the serial input port 5m and serial output port 5bK of the external control unit 5 via data lines 8 and 16, respectively. A plurality of types of data are output from the serial data output capacitor 4a as bit serial data according to a predetermined data format. As these multiple types of data, any data can be selected from among the control data used in the operation control unit 3, and an identification code is added to these data to identify the type. Figures 3(a) and 3(b) show examples of data formats suitable for such serial transmission.

In this embodiment, the data format shown in FIG. 3 (,) is used. That is, one serial data D1 is
It consists of 15 bits, the first bit is a synchronization bit B1 which is always "1", and the following 4 bits are identification bits B indicating the type of data. Finally, a 10-pit data bit B indicating the content of the data is added. The above data format is created for each desired data according to a program stored in the digital microcomputer 4.

However, it goes without saying that the creation of the serial data may be performed by a dedicated ICE added to the microcomputer 4.

An input circuit 21 is provided on the external control unit 5 side to take in serial data inputted via the f/t line 8, and the input circuit 21 converts the serial data into parallel data. When the serial-to-parallel conversion of the input data is completed, the input circuit 21 outputs data from the central processing unit (CPU).
22K interrupt command is issued, the parallel data is once taken into the CPU 22 via the pass line 23, the type of the data is determined, and according to the determination result, the parallel data is sent to the RA.
It is stored in a predetermined area within M24. The above described the operation from sending one piece of data to data storage, but the desired data is sequentially stored in the RAM 24 in real-time processing using interrupt operations based on the same procedure. Each digital data stored in is further sequentially sent to a data latch circuit 25 and latched by 11J real-time processing, converted to analog data by a digital analog converter (D/A) 26, and then sent to an analog switch circuit 27. is retrieved via.

On the output side of the analog switch circuit 27, sample and hold circuits 28□ to 28n are provided, the number of which corresponds to the type of data. The analog data is applied to a predetermined sample hold circuit according to the type of the data. Therefore, the same type of data is always input to the same sample hold circuit, and analogized data of each data appears as a voltage signal at the output terminals 11 to 11n. By connecting a measuring device to tin, waveforms can be observed in real time, or by connecting a data recorder, changes in data over time can be recorded.

In order to directly display the contents of the digital data stored in the RAM 24 as the value of the physical quantity indicated by the data, scaling data for converting each f inotal data into the value of the corresponding physical quantity is stored in the ROM 29. has been done. The digital data stored in the RAM 24 is transferred to the CPU 22 and the ROM 29.
The values of the physical quantities are converted by referring to the predetermined scaling data in the data, and are sent to the display interface circuit 31 via the data bus 23. Values such as rotational speed, cooling water temperature, injection timing, etc. are directly displayed in units of predetermined physical quantities. The data in the ROM 29 is also transmitted to the f-tabus 23, the output circuit 30, and the output ports 5C and 7.
'- is inputted to the input/output device 60 input $-) 6a via the evening line 14. A display interface circuit 41 is connected to the input capo 6m, where the input data is changed from binary mode to decimal mode, and the value of the physical quantity indicated by the data is displayed on the display device 9. can be displayed directly.

The CPU 22 further includes a failure display rung group 10 based on the failure diagnosis data stored in the RAM 24.
A program is loaded that lights up the corresponding rung of the line to inform you of the location of the failure.You can also check for failures.The results of this failure check are displayed via the /yasu line 23. The data is input to the interface circuit 31, where it is converted into data for lighting a required rung, and a failure can be indicated by the lamp group 10.

Next, a configuration for externally controlling the internal combustion engine device 1 using the power output device 6 will be described. When the data key 12 and command key 13 provided on the input/output device 6 are operated, the output from these keys is sent to the output circuit 42.
The data input of the external control unit 5 is taken out as serial data from the data output port b and the data line 15, 1? - applied to gate 5d. An input circuit 32 is connected to the f-evening port 5d, and an input/output device 6
The data from is sent to the pass line 23 via the input circuit 32 and input to the CPU 22.

In accordance with this input data, the CPU 22 outputs an identification code specifying the control mode of the operation control unit 3 and required data as serial data, and this serial data is sent to the digital microcontroller via the output circuit 33 and the data line 16. The signal is input to the combiator 4.

A program is stored in the digital microcomputer 4 in advance for decoding the contents of the above-mentioned identification coded data and switching to a specified control mode based on the data. Switching occurs automatically.

Incidentally, the data output by operating the f-key 12 and command key 13 of the input/output device 6 is not only sent to the digital micro combiator 4 as described above, but also sent to the output circuit 30 in the external control unit 5. The control command is also sent to the display unit interface circuit 41 of the input/output device 6 via the input/output device 6, and the contents of the control command are displayed on the display device 9. Therefore, the operator can confirm the content of the control command executed by operating the data key 12 and the command key 13 by looking at the content displayed on the display device 9.

The above control mode switching operation will be explained in more detail below, taking as an example a case where the fuel injection amount control of the internal combustion engine 2 is switched from an automatic control mode based on massi data to a manual control mode based on manual settings. Operation control unit, 3
When the internal combustion engine 2 is in automatic control mode, the internal combustion engine 2
Data for obtaining the optimum injection quantity for the situation at that time is stored in the memory in the form of a map.The optimum injection quantity at the time is calculated using this massi data, and the injection quantity at the center is calculated. The injection amount is controlled to match this optimum injection amount.

In such a state, if a request arises to check the performance of the internal combustion engine 2 by changing the injection amount characteristics of the internal combustion engine 2, data indicating the control mode is displayed following the identification code by operating the data key 12 and the command key 13. When the signal is input to the operation control unit 3 as a serial signal, an interrupt occurs in the program of the digital microcomputer 4, a manual control flag indicating that it is in the manual control state is set, and then the manual operation amount is input to the operation control unit 3. The indicated data together with its identification code are input into the control unit. The data indicating this manual operation amount can be easily set to any value using a control amount setting device 17 emitted from a variable resistor, for example, and the setting output signal from the data setting device 17 is sent to an analog-to-digital converter 34. The data is once input to the CPU 22 via the CPU 22, where it is converted into serial data indicating the amount of manual operation, and then sent to the output circuit 33.
Sent via . As already mentioned, the contents of this serial data are displayed on the display device 9 of the input/output device 6.

The injection amount data set by manual operation is stored in a predetermined area of the memory within the digital micro comviator 4. The program stored in the digital microcomviator 4 checks the manual control flag immediately before calculating and outputting the target optimum injection amount, and if the manual control flag is set, the program is stored in the memory. The next injection amount data set by manual operation stored in the target injection amount data is set as the target injection amount data. As a result,
The actual injection amount of the internal combustion engine 2 is manually controlled to be maintained at an arbitrarily set target injection amount. In this way, the external monitoring and control device 7 indicates that the operation of the internal combustion engine 2 is interrupted. Since the control mode of the internal combustion engine 20 can be easily changed and the control amount of the internal combustion engine 2 can be set arbitrarily, the efficiency can be greatly increased when conducting experiments to check the characteristics of the internal combustion engine, etc. It can be improved.

As explained above, it is possible to store programs for anticipated control modes in advance in the program memory of the digital microcomviator 4, and select a desired control program using signals from the external monitoring and control device 7. This configuration allows not only monitoring of data within the operation control unit 3, but also the ability to freely change the control of the internal combustion engine 2 from the outside, which is extremely convenient, particularly when performing characteristic tests of the internal combustion engine. In other words, each piece of data is assigned an identification code and output via only one transmission line, which is different from the conventional case where data is collected directly from the data line in the control unit. There is no need to know. Therefore, even if the address of the data is changed due to a change in the program of the control system on the control unit 3 side, there is an advantage that the data can be monitored without being greatly affected by this change. Further, since there is no need to open the lid of the control unit, internal data can be easily collected even when the vehicle is running, which is convenient for experiments and repairs. Also,
Since each data is converted into analog data through real-time processing, it is possible to improve the accuracy of each data of the institution.

In the above embodiment, the data format shown in FIG. Figure 3(b)
You may also use the general-purpose serial transmission data format shown in . The data format shown in Figure 3(b) is as follows: synchronization pin (QJ)C, 74-byte number bit CI for data indicating the number of bytes, identification bit C3 for the identification code indicating the type of data, and stop It consists of C4, followed by the required number of bytes of data for displaying the desired data.

The control modes of the driving control unit 30 include, in addition to the secondary motion control explained in the above embodiment, the senna of the vehicle device,
It may be configured to switch to a system check mode in which actuator and closed-loop system failure checks are performed, a data trimming mode in which data at a designated address is changed, or the like.

(Effects) According to the present invention, as described above, control data of an electronically controlled internal combustion engine device can be monitored extremely easily, and the control mode of the internal combustion engine can also be easily changed from the outside. Therefore, it is possible to efficiently obtain engine characteristic data or control methods required when electronically controlling an internal combustion engine, or when checking the operation of an electronically controlled internal combustion engine. It has the advantage of being able to accurately obtain desired data.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an example of the configuration of the present invention, and FIG. 2 is a block diagram showing the circuit of the companion device shown in FIG. FIG. 3 is a diagram showing an example of a data format used for serial data transmission in the circuit of FIG. 1... Electronically controlled internal combustion engine device, 2... Internal combustion engine,
3... Operation control unit, 4... f igitator λ microcomputer, 5... External control unit, 6...
Input/output device, 7...External monitoring control device, 9...Display device, 12...° data key, 13...Command key, 1
7... Controlled amount setting device.

Claims (1)

[Claims] 1. Monitoring the control state of an electronically controlled internal combustion engine device configured to electronically control the operation of the internal combustion engine device by a control unit including a digital computer;
In an external monitoring and control device for an electronically controlled internal combustion engine device in which control can be performed from the outside, means for transmitting required digital data in the control unit as first serial data attached with a required identification code; means for identifying and receiving the first serial data according to an attached identification code; means for converting the received data into a corresponding analog signal through real-time processing and outputting the same; and displaying the content of the analog signal. a data input device; a means for transmitting second serial data attached with a predetermined identification code for switching control modes executed by the control unit according to output data from the data input device; 2. An external monitoring and control device for an electronically controlled internal combustion engine, comprising means for changing a control mode of the control unit in response to two series data.