JPH057678Y2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) The present invention relates to an abnormality determination device for an optional device used in a device for constructing various systems by connecting optional devices to a device main body.

(Prior Art) Conventionally, in order to construct a variety of systems at a lower cost, a device configuration has been adopted in which a basic basic system is provided with a connection section for expansion, and necessary optional equipment is connected to this connection section. For example, in the case of a car, the basic system is one that is equipped with a first throttle that is linked to the accelerator pedal operated by the driver as a throttle valve that controls the intake air of the vehicle.
In addition, a connection part is prepared to newly install a second throttle that is controlled to open and close as appropriate depending on the operating status of the internal combustion engine, and an internal combustion engine system that even allows traction control can be easily created from this basic system. It is configurable.

On the other hand, with the advancement of electronic technology, in order to simplify system maintenance and improve safety, the device itself is equipped with a self-diagnosis function that automatically diagnoses its own functions. A system is known that improves the reliability of equipment by immediately notifying an abnormality when it occurs (Japanese Patent Application Laid-Open No. 125745/1983). When an optional device such as the one described above is connected to this type of system, it is essential from a reliability standpoint that it can even detect abnormalities in the optional device, and systems with this self-diagnosis function are usually pre-installed. The company has developed a product with the self-diagnosis function necessary for diagnosing abnormalities in the optional equipment.

(Problems that the invention attempts to solve) However, as mentioned above, even if there is an abnormality determination device for optional equipment that can diagnose even abnormalities in optional equipment, it is still not sufficient.
The following problems arose.

The reason why various systems can be constructed at lower cost by adding optional equipment to the basic system as appropriate is that each system can share a common basic system, and process management, etc. This is because labor savings can be achieved in many work fields.

However, in a system that has a self-diagnosis function in the main body of the device as described above, it is necessary to know in advance which optional devices are to be added, and to install electronic control devices that have an abnormality diagnosis function for those optional devices in correspondence with each system. For example, it becomes impossible to judge that the fact that an optional device is not connected to a connection part itself is an abnormality in the device, or to diagnose abnormalities specific to the optional device.

Conventionally, this has been dealt with by changing the program of the electronic control equipment or changing the electronic circuit itself for each system where different optional equipment is installed, even though the basic system is common. There were problems such as there were limits to the sharing of processes when configuring various systems, and even mass production could not be expected to bring about sufficient cost reduction effects.

This invention was developed to solve the above problems, and when constructing various systems with self-diagnosis functions, it is possible to connect the electronic control equipment that determines abnormalities in optional equipment between each system in the same way as the basic system. The purpose is to provide an excellent optional device abnormality determination device that achieves commonality.

Composition of the invention (Means for solving the problem) The means constructed in the present invention to solve the above problem is as shown in the basic configuration diagram in Fig. 1. In an abnormality determination device for an optional device that determines an abnormality in an optional device OP connected to the
an initial processing means C1 that determines whether or not a plurality of abnormalities of different types have occurred in the optional equipment OP from signals obtained from the above; and a connecting section OC to which the optional equipment OP is connected.
an abnormality determining means C2 for determining an abnormality in the optional equipment OP from signals obtained from the above; The gist of the present invention is an abnormality determination device for an optional device, which is characterized by comprising: a function stop means C3 for stopping the function;

(Function) In the abnormality determination device for an optional device of the present invention, the initial processing means C1 is activated when the device main body MP is started, and has a different aspect for the optional device OP that is selectively connected to the connection part OC of the device main body MP. This is to determine whether multiple abnormalities have occurred, and the determination is made based on the signal obtained from the connection part OC. A plurality of abnormalities with different aspects refers not to a plurality of abnormalities observed based on one malfunction (one aspect), but only to a plurality of abnormalities caused by a plurality of defects (multiple aspects). For example, one aspect of the problem is that the connector connected to the connection part OC comes off, but the abnormality that appears due to this is observed as a plurality of abnormalities in which a plurality of signal lines to be connected become open. In this way, since it is possible to know in advance what kind of a plurality of abnormalities occur due to one aspect depending on the configuration of the device, the present initial processing means C1 can detect such a plurality of abnormalities. The method does not detect anything, but only detects a plurality of abnormalities with different aspects. For example, according to the above example, if some signal lines are open but the remaining signal lines are short, it is determined that a different type of abnormality has occurred. This is the object of detection by the initial processing means C1.

The abnormality determination means C2 includes the optional equipment OP.
The abnormality of the optional device OP is determined from the signal obtained from the connecting portion OC to which the optional device OP is connected. Here, all types of abnormalities are the object of detection, and detection and determination are performed regardless of whether the abnormality is in one aspect or in multiple aspects.

The function stop means C3 is activated when the initial processing means C1 determines that a plurality of abnormalities of different types as described above have occurred, and the abnormality determination means C3 is activated.
It acts to stop the operation of 2. That is,
The operation of the abnormality determining means C2 is stopped only when the initial processing first stage C1 detects a plurality of abnormalities with different extremely specific aspects at the time of starting the main body of the device. Normally, abnormalities in the main body of the device or optional devices are caused by external factors such as vibration or heat generation when the device is in operation, and the possibility that the abnormality will occur when the main body of the device is started is extremely low. Nevertheless, the occurrence of multiple abnormalities with different modes is thought to be due to some special conditions being established, and in such special conditions, the abnormality determination means C
Stop operation 2.

Hereinafter, in order to explain the present invention more specifically, examples will be given and explained.

(Embodiment) FIG. 2 is a block diagram of an electronic control device for a vehicle internal combustion engine and its peripheral equipment incorporating an abnormality determination device for optional equipment according to an embodiment.

As shown in the figure, the electronic control device 10 includes a ROM1
According to the control program stored in advance in 2.
The CPU 14 is mainly composed of a microcomputer that processes information. Also RAM1
6 temporarily stores information and assists the processing of the CPU 14.

Further, the internal combustion engine of this embodiment has its intake pipe 20
The throttle is basically equipped with a first throttle 24 that is linked to an accelerator pedal 22 operated by the driver, and as an optional device, a second throttle that is driven to open and close by a throttle actuator 26 that operates according to control signals from the CPU 14. It is configured in advance so that a throttle 28 can be added. In other words, the internal combustion engine of this embodiment can be equipped with a traction control function as an optional device.
Figure 2 shows the second throttle 2, which is an optional device.
8 and its peripheral equipment are also installed. These two throttles 24,2
8, the throttle sensor 30, 32 detects its opening degree and the fully closed idle state, but as shown in the figure, these throttle sensors 30, 32 are
It is configured to be connected to the electronic control device 10 via.

The connectors 34 and 36 have four terminal connection points, and supply power to variable resistors 30A and 32A that are built into the throttle sensors 30 and 32 and whose resistance values change according to the opening degrees of the throttles 24 and 28. terminal VC for, and its variable resistor 30A,
32A is provided with a terminal V1 or V2 for detecting a voltage value proportional to the opening degree of the throttles 24, 28. In addition, the throttle sensors 30, 32
In order to detect the opening/closing states of switches 30B, 32B, which are built in and open/close according to the idle states of the throttles 24, 28,
A ground terminal E is provided which is connected to one terminal of switch 2B, and signal terminals I1 and I2 which are connected to the other terminal of each switch 30B and 32B. That is,
The connectors 34 and 36 have respective terminals V1 and
An analog voltage value proportional to the throttle opening appears at V2, and a ground short state corresponding to the idle state appears at each of the terminals I1 and I2.

The electronic control unit 10 serves as an interface between the connectors 34 and 36 and the CPU 14.
A well-known input/output port 17 which has an internal buffer and exchanges information in synchronization with the CPU 14, and an analog/digital converter (hereinafter referred to as A) which converts the analog voltage values of terminals V1 and V2 into digital signals. /D converter)18,
19 are available. Analog voltages on the connectors V1 and V2 are pulled up via resistors R1 and R2 for circuit protection and from the voltage source for the terminals VC of the connectors 34 and 36 via pull-up resistors R3 and R4 to the A/D converter. 18 and 19 are input.

Since the throttle sensors 30, 32 and their interfaces are configured as described above, the connector 3
For example, voltages as shown in FIG. 3 appear at terminals V1 and V2 of terminals 4 and 36. That is, throttle 2
When throttle sensors 4 and 28 are in the fully closed position, the output voltage from throttle sensors 30 and 32 is 0.5 [V], switches 30B and 32B are closed, and throttle
As switches 4 and 28 are opened from this position, switches 30B and 32B become open, and the output voltages of terminals V1 and V2 rise linearly to a value of 4.0 [V] at the fully open position. 0.0 as detection output
Throttle sensor 3 does not use the full range from [V] to 5.0 [V], which is the voltage of the voltage source.
A voltage of 0.0 [V] that appears when the signal lines 0 and 32 are in a shot state for some reason, and a voltage of 5.0 [V] that appears when the variable resistors 30A and 32A are in an open failure state. The purpose of this is to accurately and quickly detect the voltage of the sensor, and to easily identify these abnormalities.

Further, the electronic control device 10 includes an air flow meter 40, a rotation speed sensor 42, and a number of other sensors (not shown) for detecting the operating state of the internal combustion engine, like an ordinary electronic control device for a vehicle internal combustion engine. Detection output is input. Then, based on the detection results of these sensors, the electronic control device 10 calculates the amount of fuel to be supplied to the internal combustion engine, and drives the fuel injection valve 44 for a fuel injection time τ according to the calculation result.

The basic fuel injection process executed by the electronic control device 10 as described above is no different from that of conventional electronic control devices, and since it is not directly related to the gist of this embodiment, a detailed explanation will be omitted here. do.

Next, the electronic control unit 10 executes the process only when starting the internal combustion engine (not shown). The initial interrupt processing will be explained in detail. FIG. 4 is a flowchart of the initial interrupt processing. This program is stored in advance in the ROM 12, and is started by the CPU 14 when the internal combustion engine is started, for example, when the ignition switch is turned on.

First, when this program starts processing, the CPU 14
performs normal initialization processing such as clearing the RAM 16 and resetting a flag F (described later) to "0" (step 100) to prepare for subsequent processing. Next, assuming that the second throttle 28, which is an optional device, is connected, the status of each terminal of the connector 36 to which the throttle sensor 32 is connected is provided to detect the opening degree of the second throttle 28. is determined based on information from the input/output port 17. The judgment is whether or not the signal line of terminal I2 is in the ground short state (step 1).
110), then the signal line of terminal V2 has a voltage value of 5.0 [V]
There are two judgments: whether it is true or not (step 120).

In other words, the determination at step 110 is whether the second throttle 28 is in an idle condition, and the determination at step 120 is a determination whether the sensor 32 of the second throttle 28 is in an open failure condition.

As is well known, the second throttle 28 is operated in the closing direction in order to limit the intake air of the internal combustion engine when the output of the internal combustion engine is excessive and an acceleration slip occurs. When an internal combustion engine is started, it is normally in the initial state, which is a fully open state. Therefore, both of the above two judgments target abnormalities that cannot occur when the second throttle 28 and the throttle sensor 32 are operating normally.

Furthermore, these two conditions are not caused by a simple abnormality in one aspect. In other words, even if the connection of the connector 36 is defective as one of the abnormalities, the terminal I
2 and V2 will only be in an open abnormal state, and the terminal I2 will not become a ground short. Also, for some reason, the throttle sensor 32
When a short abnormality occurs in which the signal line connecting the terminal V2 and the connector 36 comes into contact with the vehicle body, the terminal V2
This is because the voltage also becomes the ground potential.

When it is determined that a plurality of abnormalities of different types have occurred in this way, the CPU 14 moves to the next step 130 and sets the flag F to "1". This flag F is used in an abnormality diagnosis program for detecting an abnormality in the second throttle 28, which will be described later, and is used to determine whether or not to execute a diagnostic process for detecting an abnormality. On the other hand, if the judgment at either step 110 or step 120 is negative, the step
Step 140 is executed instead of step 130, and the process of resetting the flag F described above to "0" is performed.

After the final flag F setting process (step 130) or reset process (step 140), the initial interrupt process ends, and the CPU 14
controls the internal combustion engine (not shown) to operate in an optimal state by executing the fuel injection process as described above. Further, the CPU 14 interrupts the control of the fuel injection process at regular intervals or at regular crank rotation angles, and performs an abnormality diagnosis process for the second throttle 28 as shown in FIG. 5. In this abnormality diagnosis processing, first, the set state of flag F operated by the above-mentioned initial interrupt processing is determined (step 200), and if flag F is set to "1", the processing of this program is immediately started. finish. In other words, if multiple abnormalities of different types occur when starting the internal combustion engine, it is determined that the second throttle 28 is not added, which is the so-called basic system state, and the subsequent The program process ends without executing the process related to the second throttle 28.

On the other hand, as a result of the judgment in step 200, the flag F
is found to be in the reset state of "0", then the voltage at terminal V2 of connector 36 is
Determine whether or not a shot abnormality of 0.0 [V] has occurred (step 210), and if the voltage is 5.0 [V].
It is determined whether an open abnormality of [V] has occurred (step 220). If either or both of these abnormalities occur, it is determined that some kind of abnormality has occurred in the second throttle 28, and the process proceeds to step 230, in which the driver is instructed to In order to notify that there is an abnormality, the program will be notified and the program will be terminated.

Furthermore, if no abnormality is observed in either step 210 or step 220, it is assumed that the second throttle 28, which is an optional device, is added and that the second throttle 28 is functioning normally. Perform the following step 240,
Allows the use of traction control using the second throttle 28. In other words, a traction control program for opening and closing the second throttle 28, which is an optional device, can be processed as appropriate. As a result, if the internal combustion engine output is so excessive that acceleration slip occurs in the drive wheels (not shown),
By controlling the second throttle 28 in the closed direction from the initial fully open state, intake air is narrowed down, and traction control that suppresses the output of the internal combustion engine becomes possible.

As described in detail above, according to the abnormality determination device for an optional device according to the present embodiment, the state in which the second throttle 28, which is an optional device, is attached is known based on the information obtained from the connector 36, and the optional device This will make it easier to use and diagnose abnormalities.

Furthermore, according to the above-mentioned abnormality determination device for optional equipment of the present embodiment, it can be used as is even in a so-called basic system that does not include any optional equipment, without changing the program or changing the electronic circuit. .

FIG. 6 shows an electronic control device 110 and an electronic control device 110 constituting a so-called basic system, in which the second throttle 28, which is an optional device, the throttle actuator 26, and the throttle sensor 32 attached thereto are removed from the above-described embodiment. FIG. 2 is a block diagram of its peripheral equipment.

Each component in the diagram is numbered in the 100s, but in order to make it easier to understand the correspondence with the above-mentioned embodiment, the number assigned to each component in the corresponding relationship is the last two digits. were made to be the same as the corresponding parts in the above-mentioned embodiment. As is clear from the figure, in this basic system, a short jumper wire 150 is connected to the connector 136 to which the throttle sensor 32, which is an optional device, was connected. This short jumper wire 150 shortens the terminal VC and the terminal V2, and the terminal I2 and the terminal E, and connects the electronic control device 110 as described above.
, it is detected as if multiple abnormalities with different aspects were occurring. That is, when the initial interrupt processing shown in FIG. 4 is executed,
Each terminal is short-circuited so that an abnormality can be observed in both step 110 and step 120, and in the basic system, flag F is always set to "1" when initial interrupt processing is executed. That will happen. Therefore, in the second throttle abnormality diagnosis process (FIG. 5) that is executed after starting the internal combustion engine, the determination at step 200 is always negative, and step 210 for diagnosing the abnormality of the second throttle 28 is performed.
It is possible to finish the process without executing the ~240 process. Therefore, there is no need to judge that the absence of an optional device is abnormal and issue a notification, and the configuration of the electronic control device 110 can be completely the same as the electronic control device 10 described above.

In this way, even if we create a situation in which multiple abnormalities with different aspects occur and distinguish between a system to which optional equipment has been added and a basic system, the reliability of diagnosing abnormalities in optional equipment will not be affected. There will be no problem. That is,
Normally, abnormalities in the main body of the device or optional devices are caused by external factors such as vibration or heat generation during operation of the device, and the possibility of an abnormality occurring when the main body of the device is started is extremely low. Nevertheless, the fact that a plurality of abnormalities of different types occur when the device is started is considered to be due to some special conditions being established. This kind of special condition is intentionally created, and in this state it is determined that the system is a basic system without any optional equipment added, and it is only in this case that it is impossible to determine the abnormality of the optional equipment. It is. This makes it possible to standardize many components, including the electronic control unit, and to significantly reduce costs by sharing processes, parts management, and other aspects.

Effects of the Invention As described above in detail with reference to embodiments, the abnormality determination device for optional devices of the present invention has a common basic system, to which different optional devices are attached as appropriate, and self-diagnosis of the optional devices is possible. It is used when configuring a variety of systems that have even functions, and it is possible to determine abnormalities in optional equipment without having to change the program of electronic control equipment or change the electronic circuit when constructing each system. becomes.

Therefore, as with the basic system, the electronic control equipment can be standardized among the systems, resulting in an excellent abnormality determination device for optional equipment that is expected to achieve sufficient cost reduction effects through mass production.

[Brief explanation of drawings]

FIG. 1 is a basic configuration diagram showing the basic configuration of an abnormality determination device for an optional device according to the present invention, FIG. 2 is a block diagram of an abnormality determination device for an optional device according to an embodiment, and FIG. 3 is a throttle diagram of the same embodiment. 4 and 5 are flowcharts of the program used in the same embodiment, and FIG. 6 is a block diagram showing the application of the abnormality determination device of the same embodiment to a basic system. It shows. 10,110...Electronic control device, 24...First throttle, 28...Second throttle, 30,3
2... Throttle sensor, 34, 36... Connector, 150... Short jumper wire.

Claims (1)

[Claims for Utility Model Registration] An abnormality determination device for an optional device that determines an abnormality in an optional device selectively connected to a connecting portion of a device main body, comprising: a signal obtained from the connecting portion when the device main body is started; an initial processing means for determining whether or not a plurality of abnormalities of different types have occurred in the optional equipment; and an abnormality determining means for determining an abnormality in the optional equipment from a signal obtained from a connection section to which the optional equipment is connected. An abnormality determination device for an optional equipment, comprising: a function stop means for stopping the operation of the abnormality determination means when the initial processing means determines that a plurality of abnormalities of different types have occurred. .