JPH0755602Y2 - Control unit inspection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a control unit for inspecting the function of a control unit (for example, a microcomputer) equipped with a plurality of functions mounted on, for example, an automobile as a single item. Regarding inspection equipment.

<Prior Art> As an inspection device for such a control unit, one as shown in FIG. 5 is known (see Japanese Utility Model Laid-Open No. 61-4210).

That is, the inspection device 1 includes the control unit 10 to be inspected.
Is provided with a work socket 2 electrically connected to the input / output terminals of the variable socket 3 and the input terminal of the work socket 2.
The variable voltage power source 4 and the load resistor 5 are connected, while the output terminal is connected to a counter 6 and a digital voltmeter 7 as measuring means.

Then, the control unit 8 sequentially inputs the combination pattern of various simulation signals to the input terminal of the inspection target control unit 10 in accordance with each control function of the control unit 10 to be inspected. An output signal output from a predetermined output terminal of the control unit 10 is sequentially compared with a predetermined reference value to check whether various functions of the control unit 10 are functioning normally.

<Problems to be Solved by the Invention> By the way, in such a conventional control unit inspection device, a functional abnormality is detected in the control unit 10.
Not only when the control unit 10 itself is originally defective,
Abnormality in the output signal, even though the control unit 10 is performing its proper function due to an abnormality in the simulation signal input to the input terminal (for example, no signal input or deviation from the setting crossover due to equipment failure). May occur and may be determined to be a functional abnormality.

When a plurality of control units 10 repeatedly determine a functional abnormality of the same item in an actual inspection process, there is a high possibility of such a simulation signal abnormality.

Therefore, conventionally, when the functional abnormality of the same item is continuously detected, the inspection process is temporarily suspended, and the variable pulse generator 3, the variable voltage power source 4, and the load resistor 5 of the inspection machine 1 are suspended.
Since these were inspected one after another for any abnormalities, it took a great deal of time to investigate the cause of the abnormality in the simulation signal.

The present invention has been made in view of the above-mentioned problems of the conventional technology, and provides an inspection device for a control unit that can detect abnormalities in simulation signals more quickly and can significantly reduce the number of steps for investigating the cause. The purpose is to do.

<Means for Solving Problems> Therefore, as shown in FIG. 1, a plurality of input terminals of a control unit as a function inspection target are connected to generate a plurality of output signal inspection simulation signals. A simulation signal generating means A, a plurality of measuring means B connected to a plurality of output terminals of the control unit, and a combination pattern in which the simulation signals are combined are input to the control unit as input signals corresponding to the respective functions, and predetermined output terminals are input. Of the control unit, which sequentially compares the output signal from the control unit with the reference value of the output signal corresponding to each function, determines the abnormality of the output signal, and sequentially determines the quality of each function. In the above, in the case where an abnormality occurs in the output signal, a simulation signal having a high probability that an abnormality has occurred is detected by the function inspection means. Storage means D for storing abnormality factor information for each function to be discriminated and display for displaying abnormality factor information stored in the storage means on display means E when an abnormality is detected in the output signal by the function inspection means. And a control means F.

<Operation> Since the above configuration is adopted, when an abnormality is detected in the output signal output from the control unit in response to the input of the combination pattern of the simulation signals, the probability of causing the abnormality in the output signal A high simulation signal is displayed as abnormal factor information. When there is an abnormality in the simulation signal input to the input terminal, the operator can quickly investigate the cause of the failure by inspecting the simulation signal generating means based on the displayed abnormality factor information.

<Embodiment> FIG. 2 shows a hardware configuration of an embodiment according to the present invention. The same elements as those in the conventional example are designated by the same reference numerals and the description thereof will be omitted.

The control unit 21 of the inspection device 20 includes a display 22 as display means and a storage device 23 as storage means.
And are connected.

Here, in the storage device 23, a data file as shown in FIG. 3 is stored on the magnetic disk. This data file is set for each type of control unit 10 as an inspection target.

This data file includes the types (S, B, C, ...) Of the simulation signals input to the input terminals (A, B, C, ...) Of the control unit 10 for each inspection step F divided into a plurality of parts corresponding to each function of the control unit 10. 10v, 4ms, L, H, ...) is stored as a simulation signal pattern, the output signal measurement terminals (a, b, ...) and the reference value are stored, and the output signal is abnormal. The input terminals (A, B, ...) Of the simulation signal having a high probability of occurrence of abnormality are stored as the abnormality factor information in a descending order of probability. As the abnormality factor information, for example, in the inspection step 1, when the simulation signal is not input to the input terminal D due to a disconnection or the like, the input terminal D is input at the L level instead of the H level and is output as the output signal. Since an abnormality occurs, it is registered as abnormality factor information, but even if it is not input to the input terminal C, it is not registered because it remains at the L level and no abnormality occurs in the output signal. On the other hand, when the inspection step is 4, this input terminal C
Causes an abnormality in the output signal and is registered as abnormality factor information.

It should be noted that any method for determining the abnormality factor information can be adopted as long as it provides reference information for investigating the cause of the abnormality in the output signal.

The abnormality factor information in the data file may be separated from other data and stored as a separate data file.

The control unit 21 is configured to include a microcomputer, and the microcomputer is provided with a function inspection means and a display control means, which are the same as conventional ones, by software.

The contents of the software will be described with reference to FIG.

In step 1 (hereinafter referred to as S1 in the figure), the operator inputs from the keyboard the type of control unit to be inspected.

In step 2, the data file for the control unit to be inspected is read into the memory in the control unit 21.

In step 3, inspection step F is set to 1.

In step 4, the simulation signal is output to each input terminal (A, B, ...) Of the control unit 10 based on the simulation signal pattern of the inspection step F in the data file.

In step 5, predetermined output terminals (a, b,
The output signal from (...) is detected.

In step 6, the output signal is compared with the reference value to determine whether or not the output signal is normal. If it is normal, the process proceeds to step 7, and if it is abnormal, the process proceeds to step 9.

In step 7, the data file total inspection step M and the current inspection step F are compared. When F <M, there is still a remaining inspection step, so in step 8, 1 is added to the inspection step F and the process proceeds to step 4.

Here, steps 2 to 8 are configured as a function inspection means.

In step 9, it is determined whether the abnormality factor information is registered in the inspection step F in the data file, and if there is registration, the process proceeds to step 10.

In step 10, the registration abnormality factor information is displayed on the display 21. When the functional abnormality of the same item is repeatedly determined by a plurality of control units 10, there is a high possibility of a simulation signal abnormality, and in this case, the inspection of the simulation signal generating means based on the displayed abnormality factor information, It is done by the operator. Step 10 constitutes display control means.

With the above configuration, when a functional abnormality of the control unit 10 is detected during the inspection of the control unit 10, a simulation signal with a high probability of occurrence of abnormality is displayed as abnormality factor information, so that the operator First, based on this display, the device connected to the display input terminal can be inspected to find the cause of the failure. Therefore, compared with the conventional inspection of all devices, the treatment can be performed with the minimum man-hours, and the man-hours can be significantly reduced.

Although the display 21 is used as the display unit in the embodiment, a printing device such as a printer may be used.

Further, in the embodiment, when an abnormality is detected at each inspection step of the simulation signal file, the registered abnormality factor information is displayed, but after the completion of a plurality of inspection steps, the inspection of each inspection step is performed. The result may be comprehensively judged (for example, the union of the registered abnormal factor information of each inspection step may be taken), and the abnormal factor information with the highest possibility may be displayed. In this case, the cause can be investigated more quickly.

Further, in the embodiment, when the output signal is abnormal even once, the abnormality factor information is displayed. However, when the output signal abnormality related to the same item is continuously detected a predetermined number of times, an alarm is issued. It may be configured to display the abnormality factor information later.

<Effect of Device> As described above, according to the present invention, when an abnormality is detected in the output signal, a simulation signal having a high probability of causing an abnormality in the output signal is displayed as abnormality factor information. By doing so, the operator can quickly find the cause of the failure based on the display.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of the present invention, FIG. 2 is a hardware configuration diagram of an embodiment according to the present invention, FIG. 3 is a table showing a data file configuration of the same, and FIG. 4 is a control of the same. A flow chart, FIG. 5 is an overall configuration diagram of a conventional inspection device for a control unit. 2 ... Work socket, 3 ... Variable pulse generator, 4
... Variable voltage power supply, 5 ... Load resistance, 6 ... Counter, 7 ... Digital voltmeter, 10 ... Control unit, 20 ... Inspection device, 21 ... Control unit, 22 ... Display, 23
…Storage device

Claims (1)

[Scope of utility model registration request] 1. A control unit inspection device for inspecting each function of a control unit having a plurality of functions for issuing a predetermined output signal in response to a predetermined input signal, wherein a plurality of input terminals of the control unit as a function inspection target. And a plurality of simulation signal generating means for generating a simulation signal for the output signal inspection, a plurality of measuring means connected to a plurality of output terminals of the control unit, and a combination pattern combining the simulation signals. It is input to the control unit as an input signal corresponding to each function, and the output signal from the predetermined output terminal and the reference value of the output signal corresponding to each function are sequentially compared to judge whether the output signal is abnormal or not. In the inspection device of the control unit, which comprises a function inspection means for sequentially judging, when an abnormality occurs in the output signal, Storage means for storing a simulation signal having a high probability of occurrence of abnormalities as abnormality factor information for each function discriminated by the function inspection means, and displayed when an abnormality is detected in the output signal by the function inspection means. A control unit for displaying abnormality factor information stored in the storage unit on the control unit.