CN101153889B - Fault detection system and method thereof - Google Patents

Abstract

A fault detection system and method, the test equipment overlapping to the key unit, the test equipment includes the touch unit connecting the first interface and second interface of the key unit, the fault detection method includes making a control module connect electrically to the first interface of the key unit, in order to send a control signal used for controlling the movement of the key unit to the first interface, and make the key unit and the corresponding first and second interface electric conduction through the touch unit, in order to make the corresponding second interface of the key unit output a response signal; a receiving module is electrically connected to the second interface and used for receiving the response signal after the control module sends the control signal; and enabling a processing module to analyze whether the response signal is the same as the control signal or not according to the control signal sent by the control module and the response signal received by the receiving module, and judging that the key unit has a line fault when the control signal is different from the response signal.

Description

Fault Detection System and Method

technical field

The invention relates to a fault detection technology, more specifically, to a fault detection system and method for detecting the line state of a multi-button unit on a circuit board.

Background technique

With the advancement of science and technology, computers have been widely used in different fields. Computers, especially notebook computers, are generally equipped with a switch board (switch board), and the switch board is provided with a multi-button unit to assist the operation of the notebook computer. Perform related operations such as power on/off, computer reset, brightness adjustment, volume adjustment, etc. When a key in the above key unit has an open circuit fault, it will affect the corresponding functions of the computer (such as failure to operate normally). Therefore, it is particularly important to carry out corresponding fault detection on the switch board before the switch board is shipped in large quantities for subsequent computer component assembly operations.

At present, the industry generally adopts the method of matching test equipment with test instruments such as oscilloscopes to perform switch board fault detection operations. The touch unit of the button unit on the switch board, and each button unit on the switch board has four pins (pins), and the four pins are short-connected in pairs to form the first interface and the second interface, and at the same time , the first interfaces of the key units on the switch board are connected in series to form a common end, and during the detection process, the common end of the switch board is grounded in advance, and the switch board is placed above the bearing seat at the same time, and The signal line of the test instrument is electrically connected to the second interface of each of the key units, when the operator presses down on a touch unit to touch the first interface and the second interface of the corresponding key unit are electrically connected , the circuit state of the key unit can be judged by the detection of the test instrument. When the test instrument shows that the output of the key unit is a high potential signal, it is judged that there is an open circuit fault in the line of the key unit. When the test instrument shows that the key unit When the unit output is a low potential signal, it is judged that the circuit of the key unit is normal. After all the key units are tested, the grounding state of the common end of the switch board is cut off.

Through the above detection method, it is possible to quickly detect whether any key unit on the switch board has an open circuit fault. Technology; SMT) when making boards, sometimes due to the operator's mistake, excessive tin will be caused when the pins of the key unit are welded to the corresponding contacts on the switch board, resulting in the pins of the key unit (especially the pins at the common end) Pins) are short-circuited with the grounded metal surface covering the key unit to protect the key unit, thereby causing the common end of the key unit to be grounded. Once the first interface (that is, the common end) of any key unit of the switch board is grounded, it will cause abnormal phenomena in the key combination function of the switch board, for example, when the operator only presses one of the key units of the switch board , may lead to the situation that another key unit (the operator does not actuate the key unit) is also pressed (that is, the two key units are touched at the same time) at the same time. However, since the above-mentioned detection method is to ground the common end of the switch board in advance, it is impossible to detect whether the switch board has a hidden line of the common end grounded. It will cause the entire computer to run abnormally. At this time, the scope of fault detection is extended to the entire computer, which not only increases the difficulty of fault detection, but also relatively increases the detection cost.

To sum up, how to propose a fault detection system and its method that can solve the shortcomings of the prior art is actually a technical problem that needs to be solved at present.

Contents of the invention

In view of the above-mentioned shortcomings of the prior art, the present invention provides a fault detection system and method thereof capable of comprehensively detecting the line status of the key unit.

The present invention also provides a fault detection system and method thereof, which can effectively avoid the fault of the key unit being extended to the fault of the entire computer due to failure to detect the short circuit fault of the key unit in the prior art, thereby increasing fault detection difficulty.

The invention also provides a fault detection system and method thereof, which can reduce the detection cost.

To achieve the above purpose and other purposes, the present invention provides a fault detection system, which is connected to a test device for testing a key unit having a first interface and a second interface, and the test device includes a circuit breaker for testing the key unit when it is touched. A touch unit that is electrically connected to the first interface of the key unit and the second interface, the fault detection system at least includes: a control module, electrically connected to the first interface of the key unit, for sending a The control signal of the key unit is sent to the first interface, and the key unit is electrically connected to the corresponding first and second interfaces through the touch unit, so that the corresponding second interface of the key unit outputs a response signal; receiving The module is electrically connected to the second interface of the key unit, and is used to receive the response signal output by the key unit through the second interface after the control module sends the aforementioned control signal; and the processing module is used According to the control signal sent by the control module and the response signal received by the receiving module, it is analyzed whether the response signal is the same as the control signal, and when the control signal is different from the response signal, it is judged that the button unit has a line Fault.

In the fault detection system of the present invention, the first interfaces of each of the key units are connected in series to form a common terminal. The line fault may be a line short circuit fault or an open circuit fault, and the line short circuit fault is manifested as the grounding of the common terminal. The control signal and the response signal can be high potential signals or low potential signals.

More specifically, when the processing module analyzes that the control signal is a high-potential signal and the response signal is a low-potential signal, it judges that the key unit circuit is a short-circuit fault; and when the control signal is a low-potential signal and the response signal When it is a high-potential signal, it is judged that the circuit of the button unit is an open circuit fault; and when the control signal sent by the control module is a high-potential or low-potential signal, the potential signal of the response signal is equal to the potential of the control signal signal, it is judged that the circuit of the button unit is normal.

In addition, the fault detection system of the present invention also includes a first electrical connection unit for electrically connecting the control module and the first interface, and a second electrical connection unit for electrically connecting the second interface and the receiving module. The connection unit, wherein the first electrical connection unit and the second electrical connection unit are cables.

In order to achieve the above-mentioned same purpose, the present invention also provides a fault detection method, which is connected to the test equipment used to test the key unit with the first interface and the second interface, and the test equipment includes an electrical device for testing the key unit when it is touched. The touch unit connected to the first interface of the key unit and the second interface, the fault detection method at least includes the following steps: (1) making a control module electrically connected to the first interface of the key unit to send a The control signal for controlling the action of the key unit is sent to the first interface, and the touch unit triggers the electrical conduction between the key unit and the corresponding first and second interfaces, so that the corresponding second interface of the key unit outputs A response signal; (2) make a receiving module electrically connected to the second interface of the key unit, for receiving the response output by the key unit through the second interface after the control module sends the aforementioned control signal and (3) make a processing module analyze whether the response signal is the same as the control signal according to the control signal sent by the control module and the response signal received by the receiving module, and if the control signal is different from the response signal When they are the same, it is judged that the key unit has a line failure.

In the fault detection method of the present invention, the first interfaces of each of the key units are connected in series to form a common terminal. The line fault may be a line short circuit fault or an open circuit fault, and the line short circuit fault is manifested as the grounding of the common terminal. The control signal and the response signal can be high potential signals or low potential signals.

In the fault detection method of the present invention, a display is also included, which is connected with the processing module and used for displaying the judgment result.

In an embodiment of the fault detection method of the present invention, the above-mentioned judging step also includes: (4) when the control signal is a high potential signal, analyzing whether the response signal is equal to the potential signal of the control signal, if not, then Proceed to step (5), if so, then proceed to step (6); (5) judge that there is a short-circuit fault in the button unit circuit, and output and display the corresponding judgment result; (6) return to step (1), and make the control The module sends a low potential signal control signal, and then executes step (2); (7) analyzes whether the response signal is equal to the potential signal of the control signal, if yes, then proceeds to step (8), if not, then proceeds to step ( 9); (8) judging that the circuit of the button unit is normal, and outputting and displaying the corresponding judgment result; and (9), judging that the circuit of the button unit has an open circuit fault, and outputting and displaying the corresponding judgment result.

In another embodiment of the fault detection method of the present invention, the above-mentioned judging step also includes: (10) when the control signal is a low potential signal, analyzing whether the response signal is equal to the potential signal of the control signal, if not, Then proceed to step (11), if so, then proceed to step (12); (11) judge that there is an open circuit fault in the button unit circuit, and output and display the corresponding judgment result; (12) return to step (1), and make The control module sends a high potential signal control signal, and then executes step (2); (13) analyzes whether the response signal is equal to the potential signal of the control signal, if so, proceeds to step (14), if not, then proceeds to step (15); (14) judging that the key unit line is normal, and outputting and displaying the corresponding judgment result; and (15), judging that the key unit line has a short-circuit fault, and outputting and displaying the corresponding judgment result.

In addition, the electrical connection between the control module and the first interface is achieved through the first electrical connection unit, and the electrical connection between the second interface and the receiving module is achieved through the second electrical connection unit It is achieved, wherein, the first electrical connection unit and the second electrical connection unit are cables.

In another embodiment of the fault detection method of the present invention, the judgment result is displayed through a display connected to the processing module.

Compared with the prior art, the fault detection system and its method of the present invention are mainly to electrically connect the control module and the receiving module to the first and second interfaces of the key unit respectively, and send messages to control specific keys through the control module. The control signal of the switch action is sent to the key unit to receive the response signal through the receiving module, and then the processing module analyzes the response signal and the control signal according to the control signal sent by the control module and the response signal received by the receiving module Whether they are equal, and at the same time that the control signal is not equal to the response signal, it is judged that the key unit has a line fault, and it can be further judged whether it is an open circuit fault or a short circuit fault. Therefore, through the present invention, it is not necessary to ground the first interface of the key unit in advance, that is, it can detect whether the key unit has an open circuit fault, and can also detect whether there is a short circuit fault, thereby achieving the effect of detecting the line state of the key unit; at the same time, Through the present invention, whether there is a short-circuit fault in the key unit can be detected early, that is, it can effectively avoid the failure to detect the short-circuit fault in the key unit in the prior art, resulting in the subsequent assembly of the switch board with the hidden danger of the line in the notebook computer. In order to extend the fault of the button unit to the fault of the whole computer, the difficulty of fault detection is increased, and the detection cost is relatively reduced. Therefore, the present invention has better industrial application value.

Description of drawings

Fig. 1 is a schematic block diagram showing the basic architecture of the fault detection system of the present invention;

Fig. 2 is the flow chart that fault detection method of the present invention carries out fault detection by fault detection system of the present invention; And

FIG. 3 is a flow chart of another embodiment of the fault detection method of the present invention performing fault detection through the fault detection system of the present invention.

Description of main component symbols

1 fault detection system

11 control module

12 first electrical connection unit

13 Second electrical connection unit

14 receiving module

15 processing modules

16 monitors

3 button unit

31 first interface

32 second interface

33 key switch

5 test equipment

51 touch unit

S10～S17, S20～S27 steps

Detailed ways

The following is a description of the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific examples, and various modifications and changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.

Please refer to FIG. 1 , which is a schematic block diagram showing the basic architecture of the fault detection system of the present invention. As shown in the figure, the fault detection system 1 of the present invention is connected to the test equipment 5 used to test the key unit 3 having the first interface 31 and the second interface 32. The first interface 31 and the touch unit 51 of the second interface 32 of the key unit 3 are connected, whether the first interface 31 and the second interface 32 can be normally electrically connected when the key unit 3 is touched, to judge Whether the function of the key unit 3 is normal.

In this embodiment, the key unit 3 includes a plurality of key switches 33 , and the touch units 51 have the same number as the key switches, and each touch unit 51 corresponds to a specific key switch 33 . In other embodiments, the number of the key switches 33 can be set according to actual needs, and the number of the touch units 51 is the same. In addition, the first interface 31 and the second interface 32 are gold fingers, and each gold finger is electrically connected to the corresponding key switch 33 . In addition, the first interfaces 31 of the key switches 33 of the key unit 3 are connected in series to form a common port.

In this embodiment, the button unit 3 is a switchboard of a notebook computer. More specifically, the key unit 3 is placed in the testing device 5 and directly below each of the touch units 51 , that is, each key switch 33 corresponds to a touch unit 51 . During the detection process, the touch unit 51 is pressed down to trigger the electrical conduction between the first interface 31 and the second interface 32 of the corresponding key unit 3 .

As shown in FIG. 1 , the fault detection system 1 of the present invention includes a control module 11 , a first electrical connection unit 12 , a second electrical connection unit 13 , a receiving module 14 , and a processing module 15 . In this embodiment, the control module 11, the receiving module 14, and the processing module 15 are all components of a micro-controller (not shown), but it is not limited thereto, and it can also be a have functionally equivalent electronic components. The first electrical connection unit 12 and the second electrical connection unit 13 can be, for example, flexible flat cables (Flexible FlatCable; FFC), but not limited thereto. For example, the control module 11 and the button unit 3 can be realized Each of the key switches 33 of the key unit 3 and the signal transmission line of the electrical connection relationship between each of the key switches 33 of the key unit 3 and the receiving module 14 all belong to the implementable scope of the present invention. In this embodiment, the first electrical connection unit 12 and the second electrical connection unit 13 are gold finger slot flexible flat cables having gold fingers corresponding to the first interface 31 and the second interface 32 .

The control module 11 is electrically connected to the first interface 31 of the key unit 3 through the first electrical connection unit 12, and is used to send a control signal for controlling the action of a specific key switch 33 to the corresponding specific key switch 33 The first interface 31 of the specific key switch 33 is electrically connected to the corresponding first and second interfaces 31 and 32 through the touch unit 51, so that the corresponding second interface 32 of the specific key switch 33 Output a response signal to the receiving module 14 . In this embodiment, the control signal and the response signal can be expressed as a high potential signal or a low potential signal.

The receiving module 14 is electrically connected to the second interface 32 of the specific key switch 33 of the key unit 3 through the second electrical connection unit 13, for receiving the key unit after the control module 11 sends the aforementioned control signal The response signal output by the specific key switch 33 of 3 through the second interface 32.

The processing module 15 is used to analyze whether the response signal is the same as the control signal according to the control signal sent by the control module 11 and the response signal received by the receiving module 14, and when the control signal is different from the response signal , it is judged that the specific key switch 33 of the key unit 3 has a line failure. In this embodiment, the line fault may be a line short-circuit fault or an open-circuit fault, and the line short-circuit fault is manifested as the grounding of the common terminal. More specifically, when the processing module 15 analyzes that the control signal is a high potential signal and the response signal is a low potential signal, it judges that the specific key switch 33 circuit of the key unit 3 is a short circuit fault; and when the control signal is low potential signal and the response signal is a high potential signal, then it is judged that the specific key switch 33 circuit of the key unit 3 is an open circuit fault; and when the control signal sent by the control module 11 is a high potential or low potential signal, the response When the potential signals of the signals are all equal to the potential signals of the control signal, it is judged that the circuit of the specific key switch 33 of the key unit 3 is normal. Accordingly, not only can it be judged whether there is an open circuit fault in the specific key switch 33 circuit of the key unit 3, but also it can be judged whether there is a short circuit fault in the common terminal circuit of the switch board.

Furthermore, the processing module 15 of the present invention is also connected to a display 16, so as to output the judgment result to the display 16 for display, wherein the display 16 can be, for example, an LCD display, an LED display, an OLED display, or a CRT display. Or plasma display etc., with the operator intuitively understands the current line state of the specific key switch 33 of this key unit 3 by this display 16, when the specific key switch 33 of this key unit 3 occurs circuit failure, can provide the operator with basis The types of line faults should be eliminated in time. It should be noted that the display method of the judgment result is not limited to the above description, and in other embodiments, it can also be displayed by means of indicator lights such as light-emitting diodes (LEDs).

In addition, for the two types of faults (short-circuit fault and open-circuit fault) that may occur in the specific key switch 33 circuit of the key unit 3, the detection objects for the detection operation performed by the fault detection system 1 of the present invention are also different. Specifically, for circuit disconnection faults, since this type of failure may occur in the key switches 33 of each key unit 3 on the switch board, it is necessary to touch the key switches 33 of all key units 3 on the switch board to detect one by one. Relatively, for line short-circuit fault, because the first interface grounding of which key unit on the switch board all can cause this type of line fault, so only need to touch the key switch 33 of any this key unit 3 on this switch board, namely The presence or absence of this type of fault can be detected.

Please refer to FIG. 2 , which is a flowchart of fault detection performed by the fault detection method of the present invention through the aforementioned fault detection system of the present invention.

As shown in the figure, first proceed to step S10, so that the control module 11 is electrically connected to the first interface 31 of the key unit 3, and electrically connected to the first interface 31 of the key unit 3 through the first electrical connection unit 12 , used to send a control signal for controlling the action of the specific key switch 33 to the first interface 31 corresponding to the specific key switch 33, and touch the specific key switch 33 with the corresponding first and second key switches 33 through the touch unit 51 The two interfaces 31 and 32 are electrically connected, so that the corresponding second interface 32 of the specific key switch 33 outputs a response signal to the receiving module 14 . Then proceed to step S11.

In step S11, the receiving module 14 is electrically connected to the second interface 32 of the specific key switch 33 of the key unit 3 through the second electrical connection unit 13, so that after the control module 11 sends the aforementioned control signal to receive the response signal output by the specific key switch 33 of the key unit 3 via the second interface 32 . Then proceed to step S12.

In step S12, according to the control signal sent by the control module 11 and the response signal received by the receiving module 14, it is analyzed whether the response signal is the same as the control signal, if not, it means that the response signal is a low potential signal, And go to step S131; if yes, it means that the response signal is also a high potential signal, and go to step S132.

In step S131, it is judged that the circuit of the specific key switch 33 of the key unit 3 has a short-circuit fault. In this embodiment, the circuit short-circuit fault is manifested as the common end of the switch board being grounded. Then proceed to step S17.

In step S132, the control signal sent by the control module 11 is switched from a high potential signal to a low potential signal to the first interface 31 corresponding to the specific key switch 33, and the specific key switch 33 and the specific key switch 33 are touched through the touch unit 51. The corresponding first and second interfaces 31 , 32 are electrically connected, so that the corresponding second interface 32 of the specific key switch 33 outputs a response signal to the receiving module 14 . Then proceed to step S14.

In step S14 , the receiving module 14 is configured to receive the response signal output by the second interface 32 . Then proceed to step S15.

In step S15, according to the low potential signal control signal sent by the control module 11 and the response signal received by the receiving module 14, analyze whether the response signal is equal to the potential signal of the control signal, at this time, if yes, it means The response signal is also a low potential signal, and proceed to step S161; if not, it indicates that the response signal is a high potential signal, and proceed to step S162.

In step S161, it is judged that the specific key switch 33 line of the key unit 3 is normal. At this time, not only can it be confirmed that the specific key switch 33 line of the key unit 3 has an open circuit fault, but also it can be confirmed that there is a short circuit in the common end line of the switch board. Fault. Then proceed to step S17.

In step S162, it is judged that the circuit of the specific key switch 33 of the key unit 3 has an open circuit fault, and then proceeds to step S17.

In step S17 , output and display the corresponding judgment result (open circuit fault, short circuit fault or normal state of the line), and in this embodiment, the judgment result is displayed by the display 16 .

What needs to be explained here is that, for circuit breakage faults, since this type of failure may occur in the key switches 33 of each key unit 3 on the switch board, it is necessary to touch the key switches 33 of all key units 3 on the switch board to proceed. Check them out one by one. Relatively, for line short-circuit fault, because the first interface grounding of which key unit on the switch board all can cause this type of line fault, so only need to touch the key switch 33 of any this key unit 3 on this switch board, namely It can be detected whether this type of fault exists (steps S10 to S17), and for subsequent detection of other key switches 33 of the key unit 3 on the switch board, it is only necessary to consider whether there is an open circuit fault problem, that is, only need to execute as shown in Figure 2 Steps S132 to S17 shown by the dotted line box in , in other words, only need to make the control module 11 send a low potential signal control signal to perform subsequent detection operations, without switching the potential signal of the control signal in the intermediate operation steps.

Please refer to FIG. 3 , which is a flow chart of another embodiment in which the fault detection method of the present invention performs fault detection through the fault detection system of the present invention. Wherein, the same or similar operation steps as those of the foregoing embodiments are represented by the same or similar component symbols, and detailed descriptions are omitted to make the description of this case clearer and easier to understand.

The difference between this embodiment and the preceding embodiments is that the fault detection method of the present invention is to make the control signal (in step S20) provided by the control module 11 for the first time be a low potential signal, and then according to the high potential signal sent by the control module 11 Signal control signal and the response signal received by the receiving module 14, when analyzing that the response signal is not equal to the control signal (that is, the response signal is a high potential signal at this time), determine the specific key switch 33 circuit of the key unit 3 Open circuit failure occurs (in step S231); when analyzing that the response signal is equal to the control signal (that is, the response signal is also a low potential signal at this moment), the control signal sent by the control module 11 is switched from low potential to The high potential signal is sent to the first interface 31 of the button unit 3 (in step S232), and in the subsequent step S25, the response signal is analyzed to be different from the high potential signal control signal (that is, the response signal is low potential at this time) signal), it is judged that the specific key switch 33 circuit of the key unit 3 has a short-circuit fault (in step S231). Therefore, compared with the first embodiment, the fault detection method of the present embodiment only reverses the detection order of the two types of faults, that is, first detects whether there is an open circuit fault in the specific key switch 33 circuit of the key unit 3, and then detects Whether there is a short-circuit fault in the specific key switch 33 circuit of the key unit 3.

In addition, as described in the first embodiment, the complete operation process (steps S20 to S27) shown in FIG. 3 is only for the key unit to be tested selected for the first time on the switch board, and for subsequent detection of other key units on the switch board. The button unit only needs to consider whether there is an open circuit fault problem, that is, it only needs to execute the steps S20 to S22, S231, S261 and S17 shown in the dotted line box shown in Figure 3 (the same as shown in the dotted line box shown in Figure 2 Operating procedures).

To sum up, the fault detection system and its method of the present invention are mainly to electrically connect the control module and the receiving module to the first and second interfaces of the key unit respectively, and send them through the control module to control the action of a specific key switch. The control signal is sent to the key unit to receive the response signal through the receiving module, and then the processing module analyzes whether the response signal is equal to the control signal according to the control signal sent by the control module and the response signal received by the receiving module , and at the same time that the control signal is not equal to the response signal, it is judged that there is a circuit fault in the button unit, and it can be further judged whether it is an open circuit fault or a short circuit fault. Therefore, through the present invention, it is not necessary to ground the first interface of the key unit in advance, that is, it can detect whether the key unit has an open circuit fault, and can also detect whether there is a short circuit fault, thereby achieving the effect of detecting the line state of the key unit; at the same time, Through the present invention, whether there is a short-circuit fault in the key unit can be detected early, that is, it can effectively avoid the failure to detect the short-circuit fault in the key unit in the prior art, resulting in the subsequent assembly of the switch board with the hidden danger of the line in the notebook computer. In order to extend the fault of the button unit to the fault of the whole computer, the difficulty of fault detection is increased, and the detection cost is relatively reduced. Therefore, the present invention has better industrial application value.

The above-mentioned embodiments only illustrate the principles and effects of the present invention, but are not intended to limit the present invention. Any person skilled in the art can modify and change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be listed in the claims.

Claims (15)

1. fault detection system, overlap joint is to having the testing apparatus of the push-button unit of first interface and second interface in order to test, this testing apparatus comprises first interface that electrically connects this push-button unit when being used to be touched and the shake-up unit of second interface, and this fault detection system comprises at least:

Control module, it electrically connects first interface that the unit is electrically connected to this push-button unit by first, in order to send one in order to control this first interface that controls signal to of this push-button unit action, and touch by this shake-up unit this push-button unit and this corresponding first and second interface are electrically conducted, export a back-signalling to make corresponding second interface of this push-button unit;

Receiver module, it electrically connects second interface that the unit is electrically connected to this push-button unit by second, after being used to this control module and sending aforesaid control signal, receives this back-signalling that this push-button unit is exported by this second interface; And

Processing module, in order to according to control signal that this control module sent and the back-signalling that this receiver module received, whether with this control signal identical, and when this control signal and this back-signalling are inequality, judge that line fault appears in this push-button unit if analyzing this back-signalling.

2. fault detection system according to claim 1, wherein, respectively first interface of this push-button unit is serially connected to form common terminal.

3. fault detection system according to claim 2, wherein, this line fault is one of them of line short fault and open circuit fault, and this line short fault shows as this common terminal ground connection.

4. fault detection system according to claim 3, wherein, this control signal and this back-signalling are one of them of high potential signal and low-potential signal.

5. fault detection system according to claim 4, wherein, this processing module is high potential signal and this back-signalling when being low-potential signal analyzing this control signal also, judges that promptly this push-button unit circuit is a short trouble; And be low-potential signal and this back-signalling when being high potential signal in this control signal, judge that then this push-button unit circuit is an open circuit fault; And, when the electric potential signal of this back-signalling all is equal to the electric potential signal of this control signal, judge that then this push-button unit circuit is normal when control signal that this control module sent is during for noble potential or low-potential signal.

6. fault detection system according to claim 1, wherein, this first electric connection unit and this second electric connection unit are cables.

7. fault detection system according to claim 1 also comprises a display, interconnects with this processing module, judges that in order to show this processing module the result of line fault appears in this push-button unit.

8. fault detection method, overlap joint is to having the testing apparatus of the push-button unit of first interface and second interface in order to test, this testing apparatus comprises first interface that electrically connects this push-button unit when being used to be touched and the shake-up unit of second interface, and this fault detection method may further comprise the steps at least:

(1) make a control module electrically connect first interface that the unit is electrically connected to this push-button unit by first, in order to send one in order to control this first interface that controls signal to of this push-button unit action, and touch by this shake-up unit this push-button unit and this corresponding first and second interface are electrically conducted, export a back-signalling to make corresponding second interface of this push-button unit;

(2) make a receiver module electrically connect second interface that the unit is electrically connected to this push-button unit, after being used to this control module and sending aforesaid control signal, receive this back-signalling that this push-button unit is exported by this second interface by second; And

(3) make a processing module according to control signal that this control module sent and the back-signalling that this receiver module received, whether analyze this back-signalling identical with this control signal, and when this control signal and this back-signalling are inequality, judge that line fault appears in this push-button unit.

9. fault detection method according to claim 8, wherein, respectively first interface of this push-button unit is serially connected to form common terminal.

10. fault detection method according to claim 9, wherein, this line fault is one of them for line short fault and open circuit fault, and this line short fault shows as this common terminal ground connection.

11. fault detection method according to claim 10, wherein, this control signal and this back-signalling are one of them of high potential signal and low-potential signal.

12. fault detection method according to claim 11, wherein, this determining step (3) also comprises:

(4) when this control signal is high potential signal, analyze the electric potential signal whether this back-signalling is equal to this control signal, if not, then proceed to step (5), if then proceed to step (6);

(5) judge that short trouble appears in this push-button unit circuit, show corresponding judged result with output;

(6) be back to step (1), and make control module send the low-potential signal control signal, then execution in step (2);

(7) analyze the electric potential signal whether this back-signalling is equal to this control signal, if, then proceed to step (8), if not, then proceed to step (9);

(8) judge this push-button unit circuit for normal, to export corresponding judged result; And

(9) judge that open circuit fault appears in this push-button unit circuit, to export corresponding judged result.

13. fault detection method according to claim 11, wherein, this determining step (3) also comprises:

(10) when this control signal is low-potential signal, analyze the electric potential signal whether this back-signalling is equal to this control signal, if not, then proceed to step (11), if then proceed to step (12);

(11) judge that open circuit fault appears in this push-button unit circuit, show corresponding judged result with output;

(12) be back to step (1), and make control module send the high potential signal control signal, then execution in step (2);

(13) analyze the electric potential signal whether this back-signalling is equal to this control signal, if, then proceed to step (14), if not, then proceed to step (15);

(14) judge this push-button unit circuit for normal, to export corresponding judged result; And

(15) judge that short trouble appears in this push-button unit circuit, to export corresponding judged result.

14. fault detection method according to claim 8, wherein, this first electric connection unit and this second electric connection unit are cables.

15. according to claim 12 or 13 described fault detection methods, wherein, this judged result is by being shown with the interconnective display of this processing module.

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