An online self-checking system and a self-checking method

Abstract

The application discloses an online self-checking system and a self-checking method. The system comprises a power supply starting circuit, a plurality of output circuits and a central processing unit, a relay coil and a relay control switch are arranged on each of the output circuits, the power supply starting circuit and the plurality of output circuits are connected to the central processing unit, and the central processing unit comprises: a power supply starting self-checking module for checking whether the power supply of the relay is started; a breakdown self-checking module for checking the relay control switch which is turned on due to breakdown and locating the output circuit where the relay control switch is located; and a wire breaking self-checking module for checking the relay control switch which cannot be turned on due to wire breaking or the relay coil which is damaged due to wire breaking and locating the output circuit where the relay control switch or the relay coil is located. According to the online self-checking system and the self-checking method, the breakdown self-checking module and the wire breaking self-checking module can not only distinguish the fault types, but also locate the output circuit where the fault is located, so that the self-checking efficiency of the circuit is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit detection, in particular to an online self-checking system and a self-checking method. BACKGROUND

[0002] Most of the traditional train control circuits are realized by using contact relays, but the relays are prone to coil open circuit, short circuit and other faults due to long-term working in high temperature, humid environment and the like. According to statistics, more than 60% of train vehicle control faults are caused by relay faults, and the relays are numerous and distributed in various control circuits, which brings many inconveniences to maintenance and fault troubleshooting.

[0003] The existing output circuit self-checking mainly includes optical coupling breakdown and optical coupling disconnection, wherein the optical coupling breakdown is manifested as that the feedback end appears potential change under the condition of no output command, and the optical coupling disconnection is manifested as that the feedback end does not appear potential change under the condition of output command, but it is limited to detecting optical coupling faults and cannot detect relay faults and locate the output circuit where the fault is located.

[0004] Therefore, it is necessary to propose a new online self-checking system and a self-checking method to solve the above problems. SUMMARY

[0005] A series of simplified concepts are introduced in the summary section, which will be further described in detail in the specific embodiment section. The summary section of the present application does not mean to attempt to limit the key features and necessary technical features of the claimed technical solution, and even less to determine the protection scope of the claimed technical solution.

[0006] The present application provides an online self-checking system, which comprises a power supply starting circuit, a plurality of output circuits and a central processing unit, a relay coil and a relay control switch are arranged on each of the output circuits, the power supply starting circuit and the plurality of output circuits are connected to the central processing unit, characterized in that the central processing unit comprises:

[0007] a power supply starting self-checking module for detecting whether the power supply of the relay is started;

[0008] a breakdown self-checking module for detecting the relay control switch which is turned on due to breakdown and locating the output circuit where the relay control switch is located;

[0009] a disconnection self-checking module for detecting the relay control switch which cannot be turned on due to disconnection damage or the relay coil which is damaged due to disconnection and locating the output circuit where the relay control switch or the relay coil is located.

[0010] Further, the system further comprises:

[0011] a display unit for displaying fault information;

[0012] an alarm unit for sending an alarm signal.

[0013] Further, the central processing unit is connected to the display unit and the alarm unit and controls the display unit and the alarm unit.

[0014] Further, the power supply starting circuit is sequentially provided with a first optocoupler, a transistor and a second optocoupler.

[0015] Further, when no starting signal is sent, the driving signal is at low level, the first optocoupler is cut off, the transistor is cut off, the second optocoupler is cut off, and the starting self-check signal is at high level; when the starting signal is sent, the driving signal is at high level, the first optocoupler is turned on, the transistor is turned on, the second optocoupler is turned on, and the starting self-check signal is at low level.

[0016] Further, the plurality of output circuits are arranged in parallel, and each output circuit is provided with a relay control switch and a relay coil.

[0017] Further, when the relay control switch is broken down and turned on, the breakdown self-check signal changes from high level to low level; when the relay control switch is broken and cannot be turned on, the broken line self-check signal changes from low level to high level.

[0018] Further, the relay control switch comprises an optocoupler or a triode.

[0019] The application also provides an online self-check method for a rail vehicle based on the above-mentioned online self-check circuit for a rail vehicle, comprising:

[0020] setting the driving signal of the power supply starting circuit and the output signal of the plurality of output circuits;

[0021] The breakdown self-check module judges whether the optocoupler is broken down based on the feedback signal of the optocoupler and locates the output circuit where the optocoupler that is broken down and turned on is located.

[0022] The broken line self-check module judges whether the optocoupler is broken based on the feedback signal of the optocoupler and locates the output circuit where the optocoupler that is broken and turned on is located.

[0023] The broken line self-check module judges whether the relay is broken based on the feedback signal of the relay and locates the output circuit where the relay that is broken is located.

[0024] The power supply starting self-check module judges whether the power supply is normally started based on the feedback signal of the relay.

[0025] Further, when the driving signal of the power start circuit is low and the output signal of the multiple output loops is low, the optocoupler detection feedback signal is high, indicating that the optocoupler is normal; and when the optocoupler detection feedback signal is low, the optocoupler on the output loop is damaged.

[0026] Further, when the driving signal of the power start circuit is low and the output signal of the multiple output loops is high, the optocoupler detection feedback signal is low, indicating that the optocoupler is normal; and when the optocoupler detection feedback signal is high, the optocoupler on the output loop is damaged.

[0027] Further, when the driving signal of the power start circuit is low and the output signal of the multiple output loops is high, the relay detection feedback signal is low, indicating that the relay is normal; and when the relay detection feedback signal is high, the relay on the output loop is damaged.

[0028] Further, when the output signal of the multiple output loops is low and the driving signal of the power start circuit is high, the relay detection feedback signal is low, indicating that the power is normally started; and when the relay detection feedback signal is high, the power is started abnormally.

[0029] According to the online self-checking system and the self-checking method, the relay control switch that is damaged by breakdown and turned on is detected and located in the output loop by the breakdown self-checking module, and the relay control switch that is damaged by disconnection and cannot be turned on or the relay that is damaged by disconnection is detected and located in the output loop by the disconnection self-checking module, so that the fault type can be distinguished and the output loop where the fault is located can be located, and the efficiency of circuit self-checking is improved. BRIEF DESCRIPTION OF DRAWINGS

[0030] The following drawings for the present application are hereby incorporated as part of the present application for the purpose of understanding the present application. The embodiments of the present application and the description thereof shown in the drawings are used to explain the principles of the present application.

[0031] In the drawings:

[0032] Figure 1 The structure block diagram of the online self-checking system according to the embodiments of the present application;

[0033] Figure 2 The circuit diagram of the online self-checking system according to the embodiments of the present application;

[0034] Figure 3 The flowchart of the online self-checking method according to the embodiments of the present application;

[0035] Figure 4 The flowchart of the online self-checking method according to the embodiments of the present application. Detailed Implementation

[0036] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid obscuring the invention.

[0037] It should be understood that the invention can be embodied in various forms and should not be construed as being limited to the embodiments set forth herein. Rather, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, for clarity, the dimensions and relative dimensions of layers and regions may be exaggerated. The same reference numerals denote the same elements throughout.

[0038] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. When used herein, the singular forms “a,” “an,” and “the” are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising” and / or “including,” when used in this specification, identify the presence of the stated features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups. When used herein, the term “and / or” includes any and all combinations of the associated listed items.

[0039] To fully understand this invention, detailed steps and structures will be presented in the following description to illustrate the technical solution proposed by this invention. Preferred embodiments of the invention are described in detail below; however, in addition to these detailed descriptions, the invention may have other embodiments.

[0040] This invention provides an online self-testing system, such as... Figure 1 As shown, the system includes a power-on circuit 170, multiple output circuits 180, and a central processing unit 140. Each output circuit 180 is equipped with a relay coil and a relay control switch. The power-on circuit 170 and the multiple output circuits 180 are connected to the central processing unit 140. The central processing unit 140 includes:

[0041] The power-on self-test module 110 is used to detect whether the power supply to the relay has been started.

[0042] The self-test module 120 is used to detect relay control switches that have been turned on due to breakdown damage and to locate the output circuit in which they are located.

[0043] The broken line self-checking module 130 is used for detecting the relay control switch which cannot be turned on due to broken line damage or the relay coil with broken line damage and locating the output circuit where the relay coil with broken line damage is located.

[0044] Further, the online self-checking system further comprises a display unit 150 and an alarm unit 160. The central processing unit 140 is coupled in communication with and controls the display unit 150 and the alarm unit 160. The display unit 150 is used for displaying fault information. The alarm unit 160 is used for sending an alarm signal.

[0045] Further, the central processing unit 140 communicates with the power-on circuit 170 and the plurality of output circuits 180 through a level conversion circuit (not shown). The I / O port signal level of the central processing unit (CPU) 140 is usually 3.3V, and the rated voltage of the relay of the output circuit 180 is 5V, 12V, 24V or 110V. Therefore, the I / O port of the CPU controls the power-on circuit and the n-way output circuit through the level conversion circuit and receives the feedback self-checking signal at the same time.

[0046] With reference to Figure 2 The power-on circuit is sequentially provided with a first optocoupler 1Q, a transistor Q0 and a second optocoupler 2Q. A plurality of (for example, n) output circuits are connected in parallel, and each output circuit is sequentially provided with a relay control switch Q1-Qn and a relay coil.

[0047] The power-on circuit provides the n-way output circuit with the started power supply, and the power-on circuit is connected to the n output circuits through a diode D0.

[0048] The relay control switches Q1-Qn include but are not limited to optocouplers, transistors and the like, and are used for controlling the on-off of the relay.

[0049] Exemplarily, the power-on self-checking module 110 is used for detecting whether the power supply of the relay is started. When the start signal is not sent, the driving signal is low, the first optocoupler is cut off, the transistor is cut off, the second optocoupler is cut off, and the start self-checking signal is high. When the start signal is sent, the driving signal is high, the first optocoupler is turned on, the transistor is turned on, the second optocoupler is turned on, and the start self-checking signal is low.

[0050] The power supply start-up self-checking process includes: when the vehicle does not send a start-up signal normally, the driving signal QD is low, the optocoupler 1Q is off, the source and the gate of the P-channel MOS transistor Q0 are high, so the Q0 is off, and the optocoupler 2Q is off, and the start-up self-checking signal QDZJ is high. When the vehicle sends a start-up signal abnormally, the driving signal QD is high, the optocoupler 1Q is on, the source of the P-channel MOS transistor Q0 is high and the gate is low, so the Q0 is on, the power supply VCC supplies power to the outlet relay through the diode D0, and the optocoupler 2Q is on, and the start-up self-checking signal QDZJ is low. The start-up self-checking signal QDZJ can detect whether the power supply of the relay is started successfully.

[0051] Exemplarily, the breakdown self-checking module 120 is used to detect the relay control switch which is turned on due to breakdown and locate the output circuit where the relay control switch is located. When the relay control switch is turned on due to breakdown, the breakdown self-checking signal changes from high to low.

[0052] The breakdown self-checking process includes: the breakdown self-checking is performed when the power supply QDVCC is not started and the output signals KC1-KCn are low. Under normal circumstances, the MOS transistor Q0 and all the optocouplers should be off. If any one of the optocouplers Q1-Qn is turned on due to breakdown, the corresponding breakdown self-checking signal JCZJ1-JCZJn will change from high to low, and it can be accurately located that which optocoupler is damaged. If the optocoupler is damaged, the power supply start-up self-checking cannot be performed.

[0053] In addition, the parallel multi-output circuits are connected in series with a resistor. The value of the resistor R4 should be much larger than the resistance of the relay coil, which can limit the current flowing through the relay to be less than the operating current of the relay, so as to ensure that the relay will not be misoperated when the optocoupler is turned on due to breakdown, and the voltage division of the relay coil resistance and the resistor R4 in series is less than the low threshold.

[0054] Exemplarily, the broken wire self-checking module 130 is used to detect the relay control switch which cannot be turned on due to broken wire damage or the relay coil which is damaged due to broken wire and locate the output circuit where the relay control switch or the relay coil is located. When the relay control switch is damaged due to broken wire and cannot be turned on, the broken wire self-checking signal changes from low to high.

[0055] The broken line self-checking process includes: performing the broken line self-checking when the power supply QDVCC is not started and the breakdown self-checking is completed, at which time the diode D0 is cut off. During the broken line self-checking, the output signals KC1-KCn are sent in sequence, so that the optocouplers Q1-Qn are turned on in sequence, and the breakdown self-checking signals JCZJ1-JCZJn and the broken line self-checking signal DXZJ correspond to low levels under normal circumstances. If the breakdown self-checking signal JCZJn is high, it indicates that the optocoupler is damaged and cannot be normally turned on; if the breakdown self-checking signal JCZJn is low and the broken line self-checking signal DXZJ is high, it indicates that the optocoupler is normal, and the relay coil is damaged.

[0056] Exemplarily, the display unit 150 is configured to display one or more of the xth optocoupler breakdown damage, the xth optocoupler broken line damage, the xth relay coil broken line, and the power supply start-up abnormality.

[0057] Exemplarily, the alarm signal of the alarm unit 160 includes, but is not limited to, one or more of a sound alarm, a light flickering alarm, and a vibration alarm.

[0058] According to the online self-checking system provided by the application, the breakdown self-checking module detects the relay control switch which is turned on due to breakdown damage and locates the output loop where the relay control switch is located, and the broken line self-checking module detects the relay control switch which cannot be turned on due to broken line damage or the relay which is damaged due to broken line damage and locates the output loop where the relay is located. Not only can the fault type be distinguished, but also the output loop where the fault is located can be located, thereby improving the efficiency of circuit self-checking.

[0059] The application further provides an online self-checking method based on the online self-checking system, as shown in Figure 3 and Figure 4 The method comprises the following steps:

[0060] Step S301: setting the driving signal of the power supply start-up circuit and the output signal of the plurality of output loops;

[0061] Step S302: the breakdown self-checking module 120 judges whether the optocoupler is damaged by breakdown based on the optocoupler detection feedback signal and locates the output loop where the optocoupler which is turned on due to breakdown damage is located;

[0062] Step S303: the broken line self-checking module 130 judges whether the optocoupler is damaged by broken line based on the optocoupler detection feedback signal and locates the output loop where the optocoupler which is turned on due to broken line damage is located;

[0063] Step S304: The broken line self-checking module 130 judges whether the relay coil is broken based on the relay detection feedback signal and locates the output circuit where the relay coil is broken.

[0064] Step S305: The power supply starting self-checking module 110 judges whether the power supply is started normally based on the relay detection feedback signal.

[0065] Firstly, step S301 is executed, and the driving signal QD of the power supply starting circuit and the output signals KC1-KCn of the multiple output circuits are set.

[0066] Exemplarily, when the driving signal of the power supply starting circuit is set as low level and the output signals of the multiple output circuits are set as low level, the optocoupler detection feedback signal is high level, which means that the optocoupler is normal, and the optocoupler detection feedback signal is low level on the output circuit, which means that the optocoupler is breakdown damaged.

[0067] In one embodiment, after the program starts, the driving signal QD is set as low level, and the output signals KC1-KCn are set as low level. Then, it is judged whether the optocoupler detection feedback signal is high level. If yes, it is judged that the optocoupler is not breakdown damaged. If no, it is judged that the xth optocoupler is breakdown damaged.

[0068] Exemplarily, when the driving signal of the power supply starting circuit is set as low level and the output signals of the multiple output circuits are set as high level, the optocoupler detection feedback signal is low level, which means that the optocoupler is normal, and the optocoupler detection feedback signal is high level on the output circuit, which means that the optocoupler is broken line damaged.

[0069] In one embodiment, the above program is continued, and the output signals KC1-KCn are set as high level, and it is judged whether the optocoupler detection feedback signal is low level. If yes, it is judged that the optocoupler is normal. If no, it is judged that the xth optocoupler is broken line damaged.

[0070] Exemplarily, when the driving signal of the power supply starting circuit is set as low level and the output signals of the multiple output circuits are set as high level, the relay detection feedback signal is low level, which means that the relay coil is normal, and the relay detection feedback signal is high level on the output circuit, which means that the relay coil is broken line damaged.

[0071] In one embodiment, the above program is continued, and it is judged whether the relay detection feedback signal is low level. If yes, it is judged that the relay is normal. If no, it is judged that the xth relay coil is broken line.

[0072] Exemplarily, when the output signals of the plurality of output circuits are set to low levels and the driving signal of the power supply starting circuit is set to a high level, if the relay detection feedback signal is a low level, the power supply is normal starting, and if the relay detection feedback signal is a high level, the power supply is abnormal starting.

[0073] In one embodiment, continuing the above procedure, the output signals KC1-KCn are set to low levels, and the driving signal QD is set to a high level. It is judged whether the relay detection feedback signal is a low level. If yes, it is judged that the power supply is normal starting, and the program flow ends. If no, it is judged that the power supply is abnormal starting.

[0074] In one embodiment, when it is judged that the xth light coupling is damaged by breakdown, it is judged that the xth light coupling is damaged by disconnection, it is judged that the xth relay coil is damaged by disconnection, or it is judged that the power supply is abnormal starting, the display unit 150 displays one or more of the above abnormalities, and the alarm unit 160 sends an alarm signal.

[0075] It should be noted that the online self-checking must follow a certain control flow. If the power supply starting self-checking is performed first, if the relay control switch has already been damaged by breakdown, the output will be misoperated. Therefore, the breakdown self-checking of the relay control switch should be performed first, then the disconnection self-checking of the relay coil or the relay control switch, and finally the power supply starting self-checking for the power supply for the relay.

[0076] According to the online self-checking method provided by the application, the relay control switch damaged by breakdown and turned on is detected by the breakdown self-checking module and located in the output circuit, and the relay control switch damaged by disconnection and unable to be turned on or the relay damaged by disconnection is detected by the disconnection self-checking module and located in the output circuit. Not only the fault type can be distinguished, but also the output circuit where the fault is located can be located, and the efficiency of the circuit self-checking is improved.

[0077] The application has been described by the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and illustration, and are not intended to limit the application to the scope of the described embodiments. In addition, those skilled in the art can understand that the application is not limited to the above embodiments, and more variants and modifications can be made according to the teaching of the application, which all fall within the scope of the application claimed. The protection scope of the application is defined by the attached claims and their equivalent scope.

Claims

1. An online self-testing system, the system comprising a power-on circuit, multiple output circuits, and a central processing unit, wherein each output circuit is provided with a relay coil and a relay control switch, the power-on circuit and the multiple output circuits are connected to the central processing unit, characterized in that, The central processing unit includes: The power-on self-test module is used to detect whether the power supply to the relay has been started. The breakdown self-test module is used to detect relay control switches that have been turned on due to breakdown damage and to locate the output circuit in which they are located. The disconnection self-test module is used to detect relay control switches that are damaged by disconnection and cannot conduct, or relay coils that are damaged by disconnection, and to locate the output circuit in which they are located. The power-starting circuit is sequentially provided with a first optocoupler, a transistor, and a second optocoupler. When no start signal is issued, the drive signal is low, the first optocoupler is off, the transistor is off, the second optocoupler is off, and the start self-test signal is high. When a start signal is issued, the drive signal is high, the first optocoupler is on, the transistor is on, the second optocoupler is on, and the start self-test signal is low.

2. The system as described in claim 1, characterized in that, Also includes: The display unit is used to display fault information; An alarm unit is used to send alarm signals.

3. The system as described in claim 2, characterized in that, The central processing unit is connected to and controls the display unit and the alarm unit.

4. The system as described in claim 1, characterized in that, The multiple output circuits are connected in parallel, and each output circuit is equipped with a relay control switch and a relay coil.

5. The system as described in claim 4, characterized in that, When the relay control switch is damaged by breakdown and becomes conductive, the breakdown self-test signal changes from high level to low level; when the relay control switch is damaged by open circuit and cannot be conductive, the open circuit self-test signal changes from low level to high level.

6. The system as described in claim 1, characterized in that, The relay control switch includes an optocoupler or a transistor.

7. An online self-testing method based on the online self-testing system according to any one of claims 1-6, characterized in that, include: Configure the drive signal of the power-on circuit and the output signals of the plurality of output circuits; The breakdown self-test module determines whether the optocoupler has been damaged by breakdown based on the optocoupler detection feedback signal and locates the output circuit where the optocoupler that has been damaged by breakdown and is conducting is located. The disconnection self-test module determines whether the optocoupler has been disconnected or damaged based on the optocoupler detection feedback signal and locates the output circuit where the optocoupler that has been disconnected and is conducting is located. The disconnection self-test module determines whether the relay coil has been disconnected or damaged based on the relay detection feedback signal and locates the output circuit where the disconnected or damaged relay coil is located. The power-on self-test module determines whether the power supply is starting normally based on the relay detection feedback signal.

8. The method as described in claim 7, characterized in that, When the drive signal of the power-on circuit is set to low level and the output signals of the multiple output circuits are set to low level, the optocoupler detection feedback signal is high level, indicating that the optocoupler is normal. When the optocoupler detection feedback signal is low level, the optocoupler on the output circuit is broken down and damaged.

9. The method as described in claim 7, characterized in that, When the drive signal of the power-on circuit is set to low level and the output signals of the multiple output circuits are set to high level, the optocoupler detection feedback signal is low level, indicating that the optocoupler is normal; when the optocoupler detection feedback signal is high level, the optocoupler on the output circuit is broken or damaged.

10. The method as described in claim 7, characterized in that, When the drive signal of the power-on circuit is set to low level and the output signals of the multiple output circuits are set to high level, the relay detection feedback signal is low level and the relay is normal; when the relay detection feedback signal is high level, the relay coil on the output circuit is broken or damaged.

11. The method as described in claim 7, characterized in that, When the output signals of the multiple output circuits are set to low level and the drive signal of the power-on circuit is set to high level, the power supply starts normally when the relay detection feedback signal is low level, and the power supply starts abnormally when the relay detection feedback signal is high level.

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