JPS592102A - Operation controlling system of internal combustion engine - Google Patents

Abstract

PURPOSE:To raise the reliability, and to raise the flexibility for addition, change, etc. of a controlled variable, by utilizing effectively an information processing system, and controlling so that at least the internal combustion engine continues its operation by the other system even in case when a fault, etc. occur in one system. CONSTITUTION:At the normal time, an information processing system 15 and an information processing system 16 share the control of an ignition system and the control of a fuel supply system, respectively, and execute each different operation processing, and also are constituted so that each operation processing information can be sent and received mutually through a common memory 25, therefore, the information processing system is utilized effectively and its performance is improved. On the other hand, in case of abnormality, for instance, when the processing system 16 becomes inoperable, digital operating devices 17 and 21 of each processing system receive operation processing information of the other processing system through the common memory 25. Subsequently, the normal processing system 15 is changed to a control program in case of abnormality. Being different from the normal time, this processing system 15 cannot obtain a detecting data from a water temperature sensor 13 or operation processing information, but control required for continuing the operation of the internal combustion engine is executed from other sensor connected to the processing system 15, and a control signal from the processing system 15 is sent to actuators 20, 24.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a system for controlling the operation of an internal combustion engine by so-called electronic control that effectively utilizes an information processing system.

Operation control of internal combustion engines, typically automobile engines, has recently been transitioning from mechanical control methods to electronic control methods that enable highly accurate and highly efficient control.

FIG. 1 is an example of a control device employing a general electronic control method. To give a more specific explanation based on the figure, 1, 2, and 3 are sensors that are installed at various locations in the internal combustion engine and detect the actual operating status as electrical signals. For example, 1 and 2 are sensors that use the rotation of the crankshaft. rotation speed sensor that detects
and a rotation angle sensor, and 3 is an intake pipe negative pressure sensor disposed within the intake manifold. Detection data detected from these various sensors is input to an information processing system 4, which intensively processes each detection data and forms a control signal, which is then provided to an internal combustion engine, such as an ignition system. The fuel is supplied to an ignition system actuator 5 such as, for example, and a fuel supply system actuator 6 such as an injection device to control their operation.

The information processing system 4 includes a CPU (central processing unit) that executes input/output operations and various calculations, a digital calculation device 7 including a memory such as ROM, and an input that connects the digital calculation device 7 with the sensors 1, 2, and 3. An IF (input interface) device 8, and an output IF that connects the digital calculation device 7 and the ignition system and fuel supply system actuators 5 and 6.
(Output interface) Consists of device 9 and functions as a microcomputer. Specifically, a control signal is obtained and supplied to each actuator by comparing and calculating the detection data from each sensor with reference data in the memory according to a predetermined control program stored in the memory.

However, since such conventional control systems are configured as a single system, if a failure occurs in any of the digital arithmetic unit 7, input IF device 8, or output IF device 9, the entire control system becomes inoperable. There is a risk that the operation of the internal combustion engine, which is the target of the control, will be seriously hindered.

Furthermore, since it is fixed as a negative system, it is difficult to deal with the problem of adding or changing sensors or actuators to complicate the calculations, as it cannot be handled as is, resulting in a difficulty in flexibility.

By the way, technically speaking, such a problem can be solved by all systems (by installing multiple identical devices, if one system fails, it is possible to switch to the other system and continue operating control, but with this method, it will not work normally) Sometimes there are unnecessary systems, which is not the best in terms of cost and efficiency.Also, in the case of adding or changing the control amount, it is better to provide some margin in the processing system in advance, but it is the same (in terms of cost). The best is φ1f.

In view of the above points, the present invention aims to effectively utilize the information processing system so that even if a failure occurs in the - system, at least the remaining systems can control the internal combustion engine to continue operating. Another object of the present invention is to provide a highly flexible operation control method for an internal combustion engine that can improve its performance and reliability, and can also cope with additions and changes in control variables.

In order to achieve such an object, the present invention includes various sensors that detect the operating state of an internal combustion engine 5, for example, an automobile engine, a plurality of information processing systems that perform calculation processing on detection data from each of these sensors, and each of these information processing systems. A writeable and readable storage device (hereinafter referred to as shared memory) that is shared by the information processing systems, and various actuators to be controlled that are connected to each of the information processing systems, and the information processing systems are connected to each other through the shared memory. The system is characterized in that each of the arithmetic processing systems is configured to mutually exchange arithmetic processing information so that different arithmetic processing processes can be shared, and each of the above-mentioned information processing systems themselves is configured to be able to perform at least the control required to continue the operation of the internal combustion engine. .

Below, preferred embodiments to which the present invention is applied will be described in detail with reference to the drawings.

FIG. 2 shows a first embodiment of the present invention and is a block diagram of an operation control device for an internal combustion engine. 10, 11, 12 and 13 are sensors arranged at various locations of an internal combustion engine, such as a gasoline engine of a car, to detect the actual operating state as an electrical signal. 11 is a suction pipe negative pressure sensor disposed in the intake manifold; 13 is the control device shown in the conventional example (see Fig. 1); A new sensor, for example, a water temperature sensor, is added to the engine, and this water temperature sensor 13 detects the cooling water temperature of the internal combustion engine.

On the other hand, 14 is an information processing unit constructed according to the present invention, further comprising a first information processing system 15 and a second information processing system 16, and in this embodiment, each processing system 15 and 16 are omitted, respectively. The same configuration is employed to form control signals for the ignition system and fuel supply system, respectively, as will be described in detail later.

The first information processing system 15 is constituted by a digital arithmetic unit 17, an input IF device 18, and an output IF device 19 as a microcomputer unit. Digital calculation device 1
γ is a CPU that executes instructions for input/output operations and various arithmetic processing;
It includes a memory for storing predetermined control programs, reference data, etc., and constitutes the core of control operations. In addition, this arithmetic unit 17 is provided with at least arithmetic processing information required for the internal combustion engine to continue operating, based on input data from various sensors to be described later in d2. The input IF device 18 includes, for example, an A-D converter, and connects the above-mentioned rotation speed sensor 10, rotation angle sensor 12, and suction pipe negative pressure sensor 11 to the digital calculation device 11, and calculates the output from each sensor. The detected data is inputted to the digital calculation device 17, and the output IF device 19 includes a drive circuit and the like, and connects the digital calculation device 17 and the ignition system actuator 20 provided in the internal combustion engine to output the data from the calculation device 17. A predetermined control signal to be output is supplied to the ignition device.

On the other hand, the basic configuration of the second information processing system 16 is the same as that of the first information processing system 15, and 21 is a digital arithmetic unit;
2 indicates that the input IF parent device 23 does not indicate an output IF device. In addition,
The second information processing system 16 is configured as described above (the input IF parent device 2 is designed to control the fuel supply system), includes the rotational speed sensor 10, the suction pipe negative pressure sensor 11, and the water temperature sensor 13.
The output IF device 23 is connected to a fuel supply system actuator 24 for the internal combustion engine, and the digital arithmetic device 21 also outputs a predetermined control signal to the actuator 24. For example, it is supplied to an injection device.

The information processing unit 14 also includes a shared memory 25 such as an IC memory that is readable and writable for each of the information processing systems 15 and 16, and this memory 25 is connected to both the digital processing units 17 and 21 and can be accessed from both of them. possible. Furthermore, the output IF device 19 of the first information processing system 15 and the fuel supply system actuator 24, and the output IF device 23 and the ignition system actuator 20 of the second information processing system 16 are each cross-connected, as will be described later. Even if one of the information processing systems 15 and 16 becomes inoperable due to a failure or the like, the other system should be able to perform the necessary control to operate the internal combustion engine.

Next, the operation and function of the motion control device having such a configuration will be explained.

First, under normal conditions, that is, when the device is fully operational, the first
The digital arithmetic unit 1γ of the information processing system 15 processes the detected data from each sensor 10, 11 and 12 and compares it with reference data to form a control signal for the ignition system. The signal is supplied to the ignition system actuator 20 to control the operation of the ignition system. Further, the detected data is directly written into the shared memory 25, and calculation result information that is effective for calculation processing in the fuel supply system, that is, the second information processing system 16, is also written into the shared memory 25.

On the other hand, the digital arithmetic unit 21 of the second information processing system 16
Then, each sensor io, 1 different from the first information processing system 15
The detection data from i and 13, especially the data from the water temperature sensor 13, are written to the shared memory 25, and the detection data and calculation result information written by the first information processing system 15 are read from the shared memory 25, and fuel is supplied. In addition to forming a control signal for the system, this control signal is supplied to the fuel supply system actuator 24 to control the operation of the fuel supply system.

In this way, during regular hunting, the first information processing system 15 takes over the control of the ignition system, and the second information processing system 16 takes over the control of the fuel supply system. 25, it is possible to effectively utilize the information processing system and improve its performance.

Next, to explain an abnormal situation, FIG. 3 shows a situation where the second information processing system 16 (see FIG. 2) becomes inoperable due to a failure or the like. In the figure, solid line portions indicate devices that are involved in control operations. Note that the same parts as in FIG.
and 21, calculations of other information processing systems via the shared memory 25'.

Since it can receive processing information, it can also enjoy diagnostic functions at the same time. That is, when the data information that should originally be written to the shared memory 25 stops, the system is determined to be inoperable according to a preset control program, and the normal information processing system, in the first embodiment, is The information processing system 15 is changed to the abnormality control program.

Therefore, although the first information processing system 15 cannot obtain detection data or calculation processing information from the water temperature sensor 13 that is different from the normal state, the first information processing system 15 cannot obtain the control required for the continued operation of the internal combustion engine. A control signal is supplied from this first information processing system 15 to each actuator 20 and 24. Therefore, each information processing system 15 and 16 is connected to at least a sensor for obtaining detection data necessary for continued operation of the internal combustion engine.

In addition, in the explanation of such an abnormality, it is possible to perform the minimum necessary operation control even without using the shared memory 25, but if there is no abnormality in the shared memory 25, the past stored in the memory 25 More effective control can be performed by using the detection data or calculation processing information, and this can be done by storing a final control program in the ROM etc. built into each digital calculation device. This can be carried out at will.

In the above explanation, we have explained the case where the second information processing system becomes inoperable (Fig. 3), but when the first information processing system becomes inoperable, the same abnormal situation will occur. A control program can be executed.

Next, a second embodiment will be described with reference to FIG. In the first embodiment described above, each information processing system was configured to share and control the control targets such as the ignition system and fuel supply system, but in the second embodiment, one information processing system can control all the control objects. The difference is that the control of the operation of the controlled object is shared, and the other information processing system is configured to share all the arithmetic processing. In Figure 4, for the same parts as in Figure 2, the same ministry name is indicated (
-Detailed explanation thereof will be omitted.

Reference numeral 26 denotes an information processing unit that includes a first information processing system 2γ and a second information processing system 28. This first 'l'l'l information processing system 27 includes a digital arithmetic unit 29, an input 1. F-equipped (63
The first information processing system 27 has the same basic configuration functions as the information processing systems 15 and 16, but the first information processing system 27 is configured as described above (shares control of all control objects). Therefore, the input IF rack device 0 includes a rotation speed sensor 10, a rotation angle sensor 12, a suction pipe negative pressure sensor 11, and a water temperature sensor 13.
All sensors that obtain input data necessary for control are connected.

Further, the second information processing system 28. is digital arithmetic unit 3
2. It is composed of an input IF rack device 3 and an output IF rack device 4, and its basic structural functions are the same as those of the information processing systems 15 and 16. In addition, since the second information processing system 28 shares all calculation processing, a sensor that obtains the detection data necessary for such calculation processing, such as an 02 sensor that detects the oxygen concentration in exhaust gas, is connected to the input IF rack device 3. In addition, other information is obtained from the first information processing system 27 using the shared memory 25 shared by each digital arithmetic unit 29 and 32, as in the first embodiment. Further, according to the present invention, each information processing system itself connects, for example, 10 rotational speed sensors to the input IF device 33 to obtain detection data necessary for controlling the internal combustion engine to continue operating.
Further, an ignition system actuator 20 and a fuel supply system actuator 24 are connected to each output IF rack device 1 and 34, respectively.

Therefore, the operation of the second embodiment is similar to that of the first embodiment, and first, during normal operation, the shared memory 25 is transferred from the first information processing system 27 to the second information processing system 28. The arithmetic processing information obtained through the processing and the input data from each sensor input to the first information processing system 27 are combined to form a control signal to control the operation of each acticoator 20 and 24. It will be clearly understood that if the processing system 27 becomes inoperable, the operation of the internal combustion engine can be continued only by the second information processing system 28.

Note that the present invention is not limited to two information processing systems as shown in the above embodiments, but is generally applicable to multiple information processing systems, and the types and quantities of sensors and actuators to be used may vary depending on the invention. It is not limited to the examples.

As described above, according to the operation flilJ control method for an internal combustion engine according to the present invention, each information processing system can share different arithmetic processing in normal times, and can mutually perform the arithmetic processing of other systems via a shared memory. Because processing information is available −
It is possible to improve performance such as control accuracy and efficiency in the system, making it possible to use it effectively. In addition, even if a failure occurs in the - system and it becomes inoperable, another system will take over and perform the necessary control for the internal combustion engine to continue operating.
Stopping the operation of the internal combustion engine due to a failure in the control system can be avoided, and the reliability of the control system can be significantly improved.

Furthermore, since it is equipped with multiple information processing systems, even when new sensors or actuators are added and the calculation content becomes complex, unlike a single fixed control system, it can be easily handled as is. It brings about various technical effects such as obtaining various advantages.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a control device employing a conventional general electronic control method, and FIG. 2 is a block diagram of an operation control device for an internal combustion engine to which the present method is applied, showing a first embodiment of the present invention. FIG. 3 is an explanatory diagram of the operation of the first embodiment, and FIG. 4 is a block system diagram of an operation control device for an internal combustion engine to which the present system is applied, showing a second embodiment of the present invention. 14・26...Information processing unit, 15.27...First information processing system, 16.28...Second information processing system, 17.2
1/29/32...Digital arithmetic device, 18/22
・30・33...Input interface device, 19.2
3.31.34...output interface device, 25.
...Storage device (shared memory). Patent Applicant Oki Electric Industry Co., Ltd. Honda Motor Co., Ltd. Representative Patent Attorney (Part 2) 1) Part 1 Figure 2 Figure 3

Claims (1)

[Claims] Various sensors that detect the operating state of the internal combustion engine, a plurality of information processing systems that perform arithmetic processing on the detection data of each sensor, a storage device that can be read and written in common to each of the information processing systems, and each of the information processing systems. Each of the information processing systems is equipped with various actuators connected to each of the systems, and each of the information processing systems valves the storage device to mutually exchange various calculation processing information so that different calculation processing can be shared, and each of the information processing systems themselves 1. An internal combustion engine operation control method, characterized in that the internal combustion engine is configured to perform at least the control required to continue the operation of the internal combustion engine.