JP2001056354A - Method for detecting contact failure due to fine short- circuiting on conductive conductor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect instantaneous contact failure due to fine short-circuiting by adding an electrical signal between both terminals on a conductive conductor, measuring the electrical signal between both the ends, and comparing it with a reference value. SOLUTION: A lead wire 200 is fixed to both ends on a conductive conductor 190 to be measured for electric contact. Then, current is supplied onto the conductive conductor 190 from a power supply device 210, and the voltage difference between both the lead wires 200 is measured by a measurement means 220. A microprocessor compares the measured voltage difference with a voltage error within a specific range by a first comparison means 230, and stores the measured voltage difference in a storage means 240 as a measurement reference value. Then, vibration is applied onto the conductive conductor 190 from a vibration means 250, and the voltage difference between both the lead wires 200 is measured and is compared with a measurement reference value being stored by a second comparison means 260. Then, when the difference between the two values is equal to or more than a predetermined specific range, a judgment means 270 judges that contact failure due to slight short-circuiting on the conductive conductor 190 has occurred.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting a contact failure due to a minute short circuit on a conductive wire. The present invention relates to a method for detecting a contact failure due to an instantaneous micro short-circuit in which the time required for a short-circuit or a transition from a short-circuited state to an electrical connection state is less than milliseconds (ms).

[0002]

BACKGROUND OF THE INVENTION With the development of electronics and metrology, almost all modern products and system operations consist of electronic controls. The basic configuration of such an electronically controlled product or system consists of an execution unit that actually performs a certain function, and an electrical response signal of the execution unit relating to a specific input signal in order to operate this execution unit normally within a desired range. And a control unit for transmitting an electrical control signal corresponding to the detected signal to the execution unit for control, and a connection unit for electrically connecting the execution unit and the control unit.

On the other hand, when an abnormality occurs in a component or a system by such electronic control, a conventional general diagnosis device diagnoses each part for the following abnormality.
That is, whether a normal output signal is output to the execution unit in response to the specific input signal, whether an output control signal of the control unit has a normal value in response to the signal input from the execution unit, By confirming whether or not the portion has an electrical defect such as a short circuit or a disconnection, the defective portion can be found.

[0004]

Such diagnostic devices have evolved into various uses and forms with the development of electronic control technology. However, despite the technical development of such diagnostic devices, there are specific items that cannot be measured and diagnosed with conventional diagnostic devices, even though they are the simplest and basically to be measured and diagnosed. I do.

A typical basic item that cannot be measured and diagnosed by such a conventional diagnostic device is to measure a contact failure due to a micro short-circuit that occurs instantaneously within a very short time on a conductive wire. is there.

There are various causes of such instantaneous contact failures. For example, a minute short circuit may occur due to accumulation of physical fatigue due to continuous external vibration. In the case of such a fine short circuit, when vibration is applied from the outside, instantaneous contact failures occur regularly or irregularly. The conventional diagnostic apparatus cannot measure such instantaneous contact failure due to a micro short circuit, and can distinguish only whether there is a complete disconnection.

For example, in the case of electronic parts in a car,
The possibility of momentary contact failure due to the continuous vibration as described above is very high. However, a conventional diagnostic device such as a scanner merely provides information that a problem has occurred in which part or part, and when the part or part that actually causes a problem is inspected, the diagnostic device diagnoses the problem. In many cases, it worked normally unlike the result. Since instantaneous contact failure due to such minute disconnection is almost impossible to measure even with a general tester, accurate diagnosis is performed in a maintenance shop, although it takes a lot of time to find the cause of the failure. Could not. The fact is that disputes with customers often occur.

[0008] Although the measurement and diagnosis of such instantaneous contact failure due to a micro short circuit is the most fundamentally required and to be performed, no effective solution has been proposed. .

The present invention has been made in view of such a problem, and an object of the present invention is to provide a method for detecting an instantaneous contact failure due to a minute short circuit.

[0010]

In order to solve the above-mentioned problems, an instant contact failure detecting method according to the present invention is described in claim 1.
It is as described below. First, after confirming the malfunctioning part with the conventional diagnostic device, the lead wire is fixed to both ends of the malfunctioning part or on both ends of the conductive wire such as the electric wiring connected to the malfunctioning part, and the electrical connection is established. Make contact. At this time, the lead wire is fixed so as not to move to reduce measurement errors. Next, a current is supplied to the conductive wire to measure a voltage difference between the two lead wires. The measured voltage difference is input to a microprocessor, and the microprocessor determines whether the measured voltage difference is within an error of a specific range. If the measured voltage difference is within an error of the specific range, the microprocessor determines the measured voltage difference. The voltage difference is set as a measurement reference value and stored. Next, vibration is applied from outside to the conductive wire. When the conductive wire has a minute short circuit, the vibration causes an instantaneous contact failure due to the vibration, and at this time, a voltage difference between the two lead wires suddenly changes. The voltage difference due to the measured instantaneous contact failure may be affected by errors in the measuring instrument itself, noise around the measurement, and the like. It should not be considered as poor contact due to fine disconnection. Therefore, if the voltage difference between the two leads measured after external vibration is input to the above microprocessor and compared with the already stored measurement reference value, the change in the value is within a specified range. The voltage difference between the two leads is re-measured based on the voltage value measured due to errors in the measuring instrument itself or noise around the measurement. Judge as contact failure due to micro short circuit. The specific range may be arbitrarily specified and input by the user according to the precision of the measurement required by the user. If the microprocessor determines that the contact failure is caused by a minute short circuit on the conductive wire, the microprocessor outputs a specific error signal to a separate display device to notify a user of the fact, and the display device outputs the specified error signal. When a specific error signal is input, the user is notified of the occurrence of the error as a signal that can be identified to the user.

As described above, according to the present invention, an electric signal is applied between both ends of a conductive wire to be measured in order to determine whether there is a contact failure due to a micro short circuit, and then an electric signal between the both ends is applied. A typical signal change is measured and compared with a reference value.
The electrical signal at this time may be any type of electrical signal as long as it can be measured and the measured value can be compared with a reference value, but a voltage value is particularly desirable.

In particular, according to the present invention, as set forth in claim 2, the method for detecting a contact failure due to a fine short circuit on a conductive wire comprises the step of: Detecting a momentary short-circuit from an electrically connected state or instantaneous contact failure in which a time from a short-circuited state to an instantaneously electrically connected state is less than milliseconds (ms). It is suitable for.

The display device can display a specific type of error signal on a monitor. At that time, as described in claim 4,
The display of the error signal by the monitor may be such that an error signal generated within a cycle set by the user is displayed continuously or fixed on the monitor. Yet another means for informing a user of a contact failure due to a micro short circuit according to the present invention is an acoustic method. The error state display by the sound may be displayed by changing the intensity of the sound generated according to the degree of the error. According to the present invention, another means for notifying a user of a contact failure due to a micro short circuit is as follows.
This is due to a separate light emitting means. The display of the error state by the light emitting means may be performed by changing the intensity of the emitted light depending on the degree of the error.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a flowchart illustrating a method of instantaneously detecting a contact failure according to an embodiment of the present invention. FIG. 2 is a hardware configuration diagram for implementing the instantaneous contact failure detection method according to the embodiment of the present invention. An instant contact failure detection method according to an embodiment of the present invention will be described with reference to FIGS.

First, the hardware of the measuring device is initialized (s10). Then, the conductive wire 190 to be measured is
Lead wires 200 are fixed to both upper ends to make electrical contact. Then, the power supply device 2 is placed on the conductive wire 190.
A current is supplied by means 10 to measure the voltage difference between the two leads 200 fixed and coupled to both ends of the conductive wire.
It measures by 0 (s20).

The measured voltage difference is input to the microprocessor, and the microprocessor compares the measured voltage difference with an error in a specific range by the first comparing means 230, and makes the measured voltage difference fall within the error in the specific range. Determine if there is
(s30). If it is determined that the difference is within the error of the specific range, the measured voltage difference is set as a measurement reference value and stored by the storage unit 240 (s40).

Next, vibration is applied to the conductive wire 190 from the outside by the vibration means 250 (s50). Then, the voltage difference between the two lead wires 200 is measured and input to the microprocessor (s60). The microprocessor compares the measured voltage difference between the two leads 200 with the stored reference value by the second comparing means 260 (s70).

As a result of the comparison, when the difference between the two values is within a specific range (for example, ± 3%), the judging means 270 uses the voltage value measured due to an error relating to the measuring instrument itself or noise around the measurement. Judging that there are both lead wire 2
The voltage difference between 00 and 00 is measured again (s80).

As a result of the comparison, if the difference between the two values is greater than a specific range, the determining means 270 determines that the conductive wire 1
It is determined that there is a contact failure due to a micro short circuit on 90 (s90).
If it is determined that there is a contact failure due to a minute short circuit on the conductive wire 190, the microprocessor outputs a specific error signal to a separate display device 280 to notify the user of the fact (s100). The display device 280 receives the output specific error signal and informs the user of the occurrence of the error using a signal in a form that can be identified to the user (s11).
0).

As a method of displaying the occurrence of an error, an error signal of a specific form is displayed on a monitor, and an error signal generated within a cycle set by a user is displayed continuously or fixed on the monitor. It may be. Alternatively, an error state may be displayed by sound, and the intensity of the generated sound may be changed according to the degree of the error. Alternatively, the error state may be displayed by the light emitting means, and the intensity of the emitted light may be changed and displayed according to the degree of the error.

The instant contact failure detecting method of the present embodiment can be applied to various types of measurement fields. As an example, the present invention can be applied to a scanner, a conventional tester, an oscilloscope, and the like, which are necessary means for diagnosing the state of a vehicle at a vehicle maintenance shop. In particular, it was difficult for conventional scanners to make accurate diagnoses except for the specialists in the car maintenance industry. However, using the diagnostic device to which the instantaneous contact failure detection method of this embodiment is applied makes it easy to use the scanner at home. Can be diagnosed.

In this embodiment, concrete means for solving the problems of the prior art seem at first glance to be simple. However, despite the urgent need for those skilled in the art, The part where the solution was not presented is
The feature is that the solution is presented in the simplest way.

While the preferred embodiment according to the present invention has been described with reference to the accompanying drawings, it is needless to say that the present invention is not limited to such an example. It is clear that a person skilled in the art can conceive various changes or modifications within the scope of the technical idea described in the claims, and it is obvious that the technical scope of the present invention is not limited thereto. It is understood that it belongs to.

[0024]

As described in detail above, according to the present invention, anybody can easily and quickly diagnose the instantaneous contact failure which has been difficult for even a specialist to diagnose in the past. It is possible to provide an instantaneous contact failure detection method applicable to a tester, an oscilloscope, and the like.

[Brief description of the drawings]

FIG. 1 is a flowchart illustrating a method of instantaneously detecting a contact failure according to an embodiment of the present invention.

FIG. 2 is a hardware configuration diagram for instantaneous contact failure detection according to an embodiment of the present invention.

[Explanation of symbols]

 190 conductive wire 200 lead 220 measuring means 250 vibrating means 280 display

Claims (8)

[Claims] 1. A method for detecting a contact failure caused by a minute short circuit on a conductive wire, the method comprising: fixing a lead wire to both ends of the conductive wire to be searched to make electrical contact; Measuring the voltage difference between the two leads after supplying a current on the conductive wire, and inputting the measured voltage difference to a microprocessor so that the microprocessor can measure the voltage difference. Is a step of determining whether the error is within a specific range, and as a result of the determination,
If the error is within the specific range, setting and storing the measured voltage difference as a measurement reference value, applying a vibration on the conductive wire, and determining a voltage difference between the two lead wires. Measuring and inputting the measured value to the microprocessor, the microprocessor comparing the measured voltage difference between the two leads with the stored reference value, and as a result of the comparison, If the difference is within a specific range, determining that the voltage value is measured due to an error relating to the measuring instrument itself or noise around the measurement, and instructing to re-measure the voltage difference between the two lead wires; As a result of the comparison, when the difference between the two values is greater than a specific range, determining that the contact failure is caused by a minute short circuit on the conductive wire; and determining that the contact failure is caused by the minute short circuit on the conductive wire. , The microprocessor outputs a specific error signal to a separate display device to notify the user of the fact, and the display device receives the specific error signal from the microprocessor and identifies the user. Informing a user of the occurrence of an error as a signal. 2. A minute short-circuit on the conductive wire is instantaneously short-circuited from the electrically connected state by the vibration, or is instantaneously short-circuited from the short-circuited state by the vibration. 2. The method according to claim 1, wherein the time required to change the connection state is less than milliseconds (ms). 3. The method according to claim 1, wherein the step of notifying the user of the occurrence of the error includes displaying a specific type of error signal on a monitor. Method. 4. An error signal display by the monitor,
4. The method of claim 3, wherein an error signal generated within a period set by a user is fixedly displayed on a monitor and displayed. 5. The method as claimed in claim 1, wherein the step of notifying the user of the occurrence of the error includes displaying an error state by a sound. 6. The contact failure according to claim 5, wherein the error status indication by the sound is displayed by changing the intensity of the sound generated according to the degree of the error. Sensing method. 7. The method according to claim 1, wherein the step of notifying the user of the occurrence of the error includes displaying an error state by a light emitting unit. 8. An error status display by said light emitting means,
The method according to claim 7, wherein the display is performed by changing the intensity of the emitted light according to the degree of the error.