De-oxidation method and device for safety circuit contact of motor train unit

Abstract

The invention provides a motor train unit safety circuit contact deoxidation method and device, and the method comprises the steps: carrying out the overall resistance test of a motor train unit safety circuit, and recording a test result; judging whether a contact oxidation problem exists or not according to a test result; if the contact oxidation problem exists, isolating the relay or contactor contact with the contact oxidation problem in the safety circuit, and performing resistance test on the isolated contact again; carrying out deoxidation preparation according to a re-test result; when the programmable power supply continuously outputs current to the isolation contact, opening and closing of the isolation contact are controlled to carry out contact deoxidation operation; and carrying out resistance test on the deoxidized isolation contact again to judge whether the deoxidation operation is continued or not until the resistance of the isolation contact returns to normal. According to the invention, extra workload and potential damage risks caused by dismounting and mounting are avoided. And the deoxidation parameters can be adjusted according to the contact material and the oxidation degree, so that a better deoxidation effect is obtained.

Description

Technical Field

[0001] The invention relates to the technical field of electromagnetic switch contact deoxidation, and in particular to a method and device for deoxidation of EMU safety circuit contacts. Background Art

[0002] The safety circuit of EMU is mainly composed of relays or contactors. Both relays and contactors are electromagnetic switches, which are switch elements that use low voltage and low current circuits to control high voltage and high current circuits. In the application process of these low-voltage switch elements, the metal on the surface of the contact will be exposed to the air, where oxygen or other active gases often react chemically with atoms on the metal surface to form a surface film. Different metal materials will generate surface films with different properties under different environmental conditions. The presence of the film will increase the contact resistance of the contact and cause serious instability, and even destroy the normal conduction of the electrical contact. Especially for small-capacity relay contacts, contact contamination has become one of the important reasons for relay failure.

[0003] During the operation of the EMU, failures of relays and contactors in important systems and key circuits will cause the EMU to slow down or even stop, affecting the operation of the vehicle. At present, EMUs have been disassembled to remove relays and contactors for deoxidation, or deoxidation tools are connected to the vehicle to achieve deoxidation. However, these methods are time-consuming and labor-intensive, and it is difficult to carry out targeted deoxidation operations on the other hand, and it is difficult to count the deoxidation effects before and after the operation. Summary of the invention

[0004] In view of this, the present invention provides a method and device for deoxidizing contacts of a motor vehicle safety circuit to solve at least one of the above-mentioned problems.

[0005] In order to achieve the above object, the present invention adopts the following scheme:

[0006] According to a first aspect of the present invention, a method for deoxidizing contacts of a motor vehicle safety circuit is provided, the method comprising: performing an overall resistance test on the motor vehicle safety circuit and recording the test results; judging whether there is a contact oxidation problem based on the test results; in response to the absence of a contact oxidation problem but the safety circuit resistance is abnormal, entering a manual processing stage; in response to the absence of a contact oxidation problem and the safety circuit resistance is normal, terminating the deoxidation process; in response to the presence of a contact oxidation problem, isolating the relay or contactor contacts in the safety circuit where the contact oxidation problem occurs, and performing a resistance test on the isolated contacts again; performing a deoxidation preparation based on the retest results, the deoxidation preparation comprising adjusting the output voltage of a variable resistor and a programmable power supply; while the programmable power supply continuously outputs current to the isolated contacts, controlling the opening and closing of the isolated contacts to perform a contact deoxidation operation; performing a resistance test on the isolated contacts after the deoxidation treatment again to judge whether to continue the deoxidation operation until the resistance of the isolated contacts returns to normal.

[0007] As an embodiment of the present invention, the overall resistance test of the EMU safety circuit in the above method includes: testing the overall resistance of the safety circuit and the contact resistance of a single relay and contactor in the safety circuit.

[0008] As an embodiment of the present invention, the above method for testing the contact resistance of a single relay and contactor in a safety circuit includes: using a PLC to control the opening and closing of a switching device so that the contacts of each relay and contactor in the safety circuit are sequentially connected in series to a resistance measuring instrument, and then detecting the real-time resistance of the contacts in the circuit.

[0009] As an embodiment of the present invention, the method further includes: using PLC to control the opening and closing of the switch device to measure the segmented resistance of the safety circuit to find the abnormal point, and when the abnormal line or component is found, a system fault prompt is issued.

[0010] As an embodiment of the present invention, the above method for isolating the relay or contactor contacts having contact oxidation problems in the safety circuit includes: using PLC to connect the relay or contactor contacts having contact oxidation problems in the safety circuit in series to a resistance testing instrument.

[0011] As an embodiment of the present invention, after the resistance test of the isolation contacts after deoxidation treatment is performed again in the above method, the method also includes: storing the test result data in a database, and the processor screening the test result data that meet the deoxidation effect standards and retaining them, and deleting the test result data that do not meet the standards, the test result data include: the resistance data of the relay and contactor contacts before deoxidation, the resistance data of the relay and contactor contacts after deoxidation, the programmable power supply voltage setting, and the resistance setting of the variable resistor.

[0012] As an embodiment of the present invention, in the above method, adjusting the output voltage of the variable resistor and the programmable power supply in the deoxidation preparation includes: matching the test results obtained by the resistance test with the resistance data of the relay and contactor contacts before deoxidation in the database; if the match is successful, adjusting the output voltage of the variable resistor and the programmable power supply based on the corresponding programmable power supply voltage setting and the resistance setting of the variable resistor in the database; if the match is unsuccessful, adjusting the output voltage of the variable resistor and the programmable power supply in coordination until the output current is adjusted to 2A.

[0013] According to a second aspect of the present invention, there is provided a device for deoxidizing contacts of a safety circuit of an EMU, the device comprising: a test recording unit for performing an overall resistance test on the safety circuit of the EMU and recording the test results; an oxidation judgment unit for judging whether there is a contact oxidation problem according to the test results; a manual processing unit for entering a manual processing stage when the oxidation judgment unit judges that there is no contact oxidation problem but the resistance of the safety circuit is abnormal; a process ending unit for terminating the deoxidation process when the oxidation judgment unit judges that there is no contact oxidation problem and the resistance of the safety circuit is normal; and an isolation test unit for terminating the deoxidation process when the oxidation judgment unit judges that there is no contact oxidation problem and the resistance of the safety circuit is normal. When it is determined that there is a contact oxidation problem, the relay or contactor contacts with the contact oxidation problem in the safety circuit are isolated, and the resistance test of the isolated contacts is performed again; a deoxidation preparation unit is used to perform deoxidation preparation according to the re-test result, and the deoxidation preparation includes adjusting the output voltage of the variable resistor and the programmable power supply; the deoxidation unit is used to control the opening and closing of the isolation contacts to perform contact deoxidation operation while the programmable power supply continuously outputs current to the isolation contacts; the isolation test unit is also used to perform resistance test on the isolation contacts after deoxidation treatment again to determine whether to continue the deoxidation operation until the resistance of the isolation contacts returns to normal.

[0014] As an embodiment of the present invention, the above-mentioned test recording unit performs an overall resistance test on the EMU safety circuit, including: testing the overall resistance of the safety circuit and the contact resistance of a single relay and contactor in the safety circuit.

[0015] As an embodiment of the present invention, the above-mentioned test recording unit tests the contact resistance of a single relay and contactor in a safety circuit, including: using PLC to control the opening and closing of the switching device so that the contacts of each relay and contactor in the safety circuit are connected in series to the resistance measuring instrument in turn, and then detecting the real-time resistance of the contacts in the circuit.

[0016] As an embodiment of the present invention, the above-mentioned device also includes: an abnormal point detection unit, which is used to use PLC to control the opening and closing of the switching device to measure the segmented resistance of the safety circuit to find the abnormal point before entering the manual processing stage, and to issue a system fault prompt when the abnormal line or component is found.

[0017] As an embodiment of the present invention, the above-mentioned isolation test unit isolates the relay or contactor contacts with contact oxidation problems in the safety circuit, including: using PLC to connect the relay or contactor contacts with contact oxidation problems in the safety circuit in series to a resistance testing instrument.

[0018] As an embodiment of the present invention, the above-mentioned device also includes: a data recording unit, which is used to store the test result data in a database, and the processor screens the test result data with satisfactory deoxidation effect and retains them, and deletes the test result data that does not meet the standards. The test result data includes: the resistance data of the relay and contactor contacts before deoxidation, the resistance data of the relay and contactor contacts after deoxidation, the programmable power supply voltage setting, and the resistance setting of the variable resistor.

[0019] As an embodiment of the present invention, the above-mentioned deoxidation preparation unit includes: a data matching module, which is used to match the test results obtained by the resistance test with the resistance data of the relay and contactor contacts before deoxidation in the database; a first adjustment module, which is used to adjust the output voltage of the variable resistor and the programmable power supply based on the corresponding programmable power supply voltage setting and the resistance setting of the variable resistor in the database when the data matching module matches successfully; and a second adjustment module, which is used to cooperate in adjusting the output voltage of the variable resistor and the programmable power supply until the output current is adjusted to 2A when the data matching module matches unsuccessfully.

[0020] According to a third aspect of the present invention, there is provided an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above method when executing the computer program.

[0021] According to a fourth aspect of the present invention, there is provided a computer-readable storage medium having a computer program stored thereon, wherein the computer program implements the steps of the above method when executed by a processor.

[0022] According to a fifth aspect of the present invention, there is provided a computer program product, comprising a computer program / instructions, which implement the steps of the above method when executed by a processor.

[0023] It can be seen from the above technical solution that the method and device for deoxidizing the contacts of the EMU safety circuit provided by the present application have the following beneficial effects:

[0024] 1. Compared with the prior art that requires disassembling relays and contactors for deoxidation, or connecting special deoxidation tools to the vehicle, the method of the present application does not require disassembling components, and deoxidation operations are performed directly in the safety circuit, which significantly shortens maintenance time, reduces maintenance costs and human resource consumption. This avoids the extra workload and potential damage risks caused by disassembly and installation.

[0025] 2. The method of the present application can accurately locate the contacts that need to be deoxidized through precise resistance testing, thus avoiding the problem of difficulty in targeted operation in existing methods. The combination of programmable power supply and variable resistor can adjust the deoxidation parameters according to the contact material and oxidation degree, ensuring the effectiveness and targeting of the deoxidation treatment, thereby obtaining a better deoxidation effect.

[0026] 3. The method of the present application stores the test results (including resistance data before and after deoxidation, voltage setting, and resistance setting) in a database, which can provide data support for the adjustment of the programmable power supply and variable resistor, thereby achieving better deoxidation effect and higher efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0028] Figure 1 It is a schematic flow chart of a method for deoxidizing contacts of a safety circuit of an EMU provided in an embodiment of the present application;

[0029] Figure 2 It is a schematic diagram of a flow chart of adjusting the output voltage of a variable resistor and a programmable power supply in the deoxidation preparation provided in an embodiment of the present application;

[0030] Figure 3 It is a structural schematic diagram of a contact deoxidation device for a motor vehicle safety circuit provided in an embodiment of the present application;

[0031] Figure 4 It is a structural schematic diagram of a contact deoxidation device for a safety circuit of an EMU provided by another embodiment of the present application;

[0032] Figure 5 is a schematic structural diagram of a deoxidation preparation unit provided in an embodiment of the present application;

[0033] Figure 6 It is a schematic block diagram of the system structure of the electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0034] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0035] At present, the EMU has used disassembly means to dismantle the relays and contactors for deoxidation, or connected deoxidation tools on the vehicle to achieve deoxidation. These methods are time-consuming and labor-intensive on the one hand, and it is difficult to carry out targeted deoxidation film operations on the other hand, and it is difficult to count the deoxidation effects before and after the operation. Therefore, the purpose of this application is to provide a method and device for deoxidation of the safety circuit contacts of the EMU, which can not only fully automate the contact deoxidation operation and liberate manpower, but also can carry out targeted deoxidation film operations.

[0036] like Figure 1 The figure shows a flow chart of a method for deoxidation of the safety circuit contacts of a train set provided in an embodiment of the present application. This embodiment describes the present application from the side of the deoxidation control unit. The method comprises the following steps:

[0037] Step S101: Perform an overall resistance test on the EMU safety circuit.

[0038] This step is the initial step of the deoxidation process of the safety circuit contact of the EMU of this application, and is a preliminary resistance measurement of the entire safety circuit. A high-precision multimeter or a professional loop tester can be used to measure the overall resistance value of the safety circuit at the test point (determined according to the circuit diagram). In this embodiment, multiple measurements can be taken to average the values ​​to improve the measurement accuracy, and factors such as ambient temperature that may affect the measurement results can also be recorded.

[0039] In addition to testing the overall resistance of the safety circuit, this step also measures the contact resistance of individual relays and contactors in the safety circuit.

[0040] Preferably, when measuring the contact resistance of a single relay and contactor in a safety circuit, a programmable logic controller (PLC) can be used to control the opening and closing of the switch device (relay and contactor) so that the contacts of each relay and contactor in the safety circuit are sequentially connected in series to a resistance measuring instrument, and then the resistance measuring instrument is used to detect the real-time resistance of the contacts in the circuit. This automated testing method significantly improves the test efficiency and accuracy, and avoids errors that may be introduced by manual operation.

[0041] Step S102: Record the test results into a database.

[0042] The overall resistance of the safety circuit tested for the first time and the contact resistance of individual relays and contactors in the safety circuit are stored in the database. When storing the contact resistance of individual relays and contactors, the device type (relay or contactor) is stored together with the corresponding contact resistance, so that the subsequent processor can determine whether there is a contact oxidation problem based on the test results, and can subsequently adjust the appropriate deoxidation current based on the device type.

[0043] Step S103: Determine whether there is a contact oxidation problem based on the test results. Here, according to different test results, it can be handled in three situations: in the first situation, there is no contact oxidation problem, but the safety loop resistance is abnormal, then enter the manual processing stage; in the second situation, there is no contact oxidation problem, and the safety loop resistance is normal, then end the deoxidation process; in the third situation, there is a contact oxidation problem, then enter step S104.

[0044] According to the test result of step S101, the processor can determine whether there is a contact oxidation problem. Specifically, it is divided into the above three situations:

[0045] The first case: There is no contact oxidation problem, but the safety circuit resistance is abnormal. This situation indicates that the problem may be in other components or circuits, such as circuit breakage, component damage, etc. This situation requires manual processing, and technicians will perform troubleshooting and repairs based on the specific situation.

[0046] Preferably, before entering the manual processing stage, the method of this embodiment may also include the following steps: using PLC to control the opening and closing of switching devices to measure the segmented resistance of the safety circuit to find abnormal points, and when abnormal lines or components are found, a system fault prompt is issued.

[0047] The total resistance of the loop is abnormal, which means that there is extra resistance somewhere in the circuit, causing the resistance value of the entire circuit to deviate from the expected value.

[0048] Therefore, in order to facilitate technicians to troubleshoot, this embodiment adopts a segmented measurement method, which means dividing the entire circuit into several small sections, and then measuring the resistance of each section separately. By comparing the resistance value of each section with the expected value, the fault range can be gradually narrowed down and the fault point can be finally found. Then the system can generate a fault point prompt to instruct the technician to manually handle the fault, such as replacing damaged components, repairing disconnected lines, or other necessary maintenance work.

[0049] For example:

[0050] Assume that a circuit includes a relay, resistors R1, R2, and a load, and the total resistance is abnormal. The segmented measurement process is as follows:

[0051] Step 1: Measure the relay contact resistance (normal).

[0052] Step 2: Measure the resistance from the relay to R1 (normal).

[0053] Step 3: Measure the resistance of R1 (normal).

[0054] Step 4: Measure the resistance between R1 and R2 (abnormal).

[0055] Step 5: Measure the resistance of R2 (normal).

[0056] Step 6: Measure the resistance from R2 to the load (normal).

[0057] Through the above steps, it can be determined that the fault is located in the line between R1 and R2. The system will prompt that there is a problem at this location, and then the technician will manually check and repair it.

[0058] The second case: there is no contact oxidation problem and the safety circuit resistance is normal. This situation indicates that the safety circuit is working normally and no deoxidation operation is required, and the process ends.

[0059] The third situation: there is a contact oxidation problem. If the measured contact resistance of a single relay and a contactor is significantly higher than the expected value, it can be determined that there is a contact oxidation problem, and the process goes to step S104.

[0060] Step S104: isolating the relay or contactor contacts in the safety circuit that have contact oxidation problems.

[0061] According to the judgment result of step S103, the relay or contactor with the contact oxidation problem is located. In order to avoid affecting other components, the problematic contacts need to be isolated from the safety circuit. Preferably, this embodiment can use PLC to connect the relay or contactor contacts with the contact oxidation problem in the safety circuit in series to the resistance tester, thereby achieving contact isolation.

[0062] That is, this embodiment utilizes the control capability of the PLC to achieve contact isolation, eliminating the need for manual disassembly of relays or contactors, minimizing the risk of damage and simplifying the maintenance process. Isolation is achieved by cleverly integrating resistance measuring instruments into the circuit through the PLC. The PLC provides precise control, and only specific contacts identified as oxidized are isolated, while the rest of the safety circuit continues to operate normally, minimizing interruptions.

[0063] Step S105: Perform a resistance test on the isolation contacts again.

[0064] Performing a separate resistance test on the isolated contacts more accurately measures the resistance of the oxidized contacts, and again the test results need to be accurately recorded so that they can be compared with the results after the deoxidation treatment.

[0065] Step S106: Determine whether deoxidation operation is required based on the retest result, if yes, proceed to step S107, otherwise, end the deoxidation process.

[0066] Determine whether deoxidation is required based on the test result of step S105. If the resistance value is still significantly higher than the normal value, deoxidation is required (proceed to step S107); otherwise, it indicates that the contact problem may not be caused by oxidation, and further inspection or treatment of other faults is required, and the process ends.

[0067] Step S107: performing deoxidation preparation, including adjusting the output voltage of the variable resistor and the programmable power supply.

[0068] Since different devices require different currents during the deoxidation process, for example, relays require large currents, while contactors require small currents. If the current is too small, the energy of the electric sparks generated during the subsequent deoxidation will be insufficient, and the oxide film may not be effectively removed; if the current is too large, the energy of the electric sparks generated later will be too large, which may damage the contacts or even cause contact ablation. Therefore, the present application requires strict control of the output current. In the present application, the current is controlled by adjusting the output voltage of the variable resistor and the programmable power supply.

[0069] The programmable power supply provides an adjustable DC voltage, and the variable resistor is connected in series with the programmable power supply to form a variable resistor circuit. By changing the resistance of the variable resistor, the total resistance of the circuit can be changed, thereby changing the current in the circuit. By coordinating the output voltage of the programmable power supply and the resistance of the variable resistor, the system can accurately control the current flowing through the contacts, thereby accurately controlling the energy of the electric spark, and ultimately achieving efficient and safe contact deoxidation.

[0070] Step S108: While the program-controlled power supply continuously outputs current to the isolation contact, the isolation contact is controlled to open and close to perform contact deoxidation. After the deoxidation operation is completed, return to step S105 to perform resistance testing again until the resistance of the isolation contact returns to normal, and then the deoxidation process is terminated.

[0071] In step S107, the system controls the current within a suitable range by adjusting the output voltage of the variable resistor and the programmable power supply. This current is not used for direct deoxidation, but is used to prepare for the generation of sparks. In this step, the PLC controls the opening and closing of the contacts, so that the contacts generate sparks at the moment of power on. Repeated opening and closing operations generate multiple sparks, thereby removing the oxide film more thoroughly.

[0072] Preferably, after the resistance test is performed again on the isolation contacts after deoxidation treatment, the method further includes: storing the test result data in a database, and having the processor screen the test result data that meet the deoxidation effect standards and retain them, and deleting the test result data that do not meet the standards, the test result data including: the resistance data of the relay and contactor contacts before deoxidation, the resistance data of the relay and contactor contacts after deoxidation, the programmable power supply voltage setting, and the resistance setting of the variable resistor.

[0073] Accordingly, it is further preferred that Figure 2 As shown, in the above step S107, adjusting the output voltage of the variable resistor and the programmable power supply in the deoxidation preparation may include the following sub-steps:

[0074] Step S201: Match the test results obtained from the resistance test with the resistance data of the relay and contactor contacts before deoxidation in the database.

[0075] Before preparing for deoxidation (step S107), the system first performs a resistance test to obtain the contact resistance data before deoxidation. This step S201 is to match this test result with the contact resistance data before deoxidation already in the database. The basis for matching may be information such as contact type and model. A large amount of historical data is stored in the database, including the resistance values ​​of different types of contacts before deoxidation, the corresponding optimal programmable power supply voltage settings and variable resistor resistance settings, and the resistance values ​​after deoxidation.

[0076] Step S202: If the match is successful, the output voltage of the variable resistor and the programmable power supply is adjusted based on the corresponding programmable power supply voltage setting and the resistance setting of the variable resistor in the database.

[0077] If step S201 is successfully matched, it means that there is historical data similar to the current contact type in the database. The system will directly adjust the output voltage of the variable resistor and the programmable power supply according to the corresponding programmable power supply voltage setting and variable resistor resistance setting in the database. This is an intelligent control method based on empirical data, which can improve the deoxidation efficiency and success rate.

[0078] The matching in this step may be a fuzzy matching method, that is, as long as the difference between the test result and the resistance data in the database is within a set range, the matching can be considered successful.

[0079] Step S203: If the matching is unsuccessful, the variable resistor and the output voltage of the programmable power supply are adjusted together until the output current is adjusted to 2A.

[0080] If the matching in step S201 fails, it means that there is no historical data in the database that is exactly the same as the current contact type. At this time, the system will adopt a default strategy, such as adjusting the output current to 2A (which may be an empirical value or a safe value), and then perform a deoxidation operation. This is a conservative strategy to ensure that a safe deoxidation operation can be performed even in the absence of historical data. The test results of this time (including resistance data before and after deoxidation, programmable power supply voltage setting, and variable resistor resistance setting) can be stored in the database later to provide a reference for future deoxidation operations.

[0081] It can be seen from the above technical solution that the method for deoxidizing the contacts of the EMU safety circuit provided by the present application has the following beneficial effects:

[0082] 1. Compared with the prior art that requires disassembling relays and contactors for deoxidation, or connecting special deoxidation tools to the vehicle, the method of the present application does not require disassembling components, and deoxidation operations are performed directly in the safety circuit, which significantly shortens maintenance time, reduces maintenance costs and human resource consumption. This avoids the extra workload and potential damage risks caused by disassembly and installation.

[0083] 2. The method of the present application can accurately locate the contacts that need to be deoxidized through precise resistance testing, thus avoiding the problem of difficulty in targeted operation in existing methods. The combination of programmable power supply and variable resistor can adjust the deoxidation parameters according to the contact material and oxidation degree, ensuring the effectiveness and targeting of the deoxidation treatment, thereby obtaining a better deoxidation effect.

[0084] 3. The method of the present application stores the test results (including resistance data before and after deoxidation, voltage setting, and resistance setting) in a database, which can provide data support for the adjustment of the programmable power supply and variable resistor, thereby achieving better deoxidation effect and higher efficiency.

[0085] like Figure 3 The structure diagram of a deoxidation device for contact points of a motor vehicle safety circuit provided by an embodiment of the present application is shown, and the device includes: a test recording unit 310, an oxidation judgment unit 320, a manual processing unit 330, a process end unit 340, an isolation test unit 350, a deoxidation preparation unit 360 and a deoxidation unit 370, wherein:

[0086] The test recording unit 310 is used to perform an overall resistance test on the EMU safety circuit and record the test results.

[0087] The oxidation judgment unit 320 is used to judge whether there is a contact oxidation problem according to the test result.

[0088] The manual processing unit 330 is used to enter the manual processing stage when the oxidation judgment unit judges that there is no contact oxidation problem, but the safety circuit resistance is abnormal.

[0089] The process ending unit 340 is used to end the deoxidation process when the oxidation judgment unit determines that there is no contact oxidation problem and the safety loop resistance is normal.

[0090] The isolation test unit 350 is used to isolate the relay or contactor contacts with the contact oxidation problem in the safety circuit when the oxidation judgment unit determines that there is a contact oxidation problem, and perform a resistance test on the isolated contacts again.

[0091] The deoxidation preparation unit 360 is used to perform deoxidation preparation according to the retest result, and the deoxidation preparation includes adjusting the output voltage of the variable resistor and the programmable power supply.

[0092] The deoxidation unit 370 is used to control the opening and closing of the isolation contacts to perform contact deoxidation operation while the programmable power supply continuously outputs current to the isolation contacts.

[0093] The isolation test unit 350 is further used to perform a resistance test on the isolation contacts after the deoxidation treatment to determine whether to continue the deoxidation operation until the resistance of the isolation contacts returns to normal.

[0094] Preferably, the test recording unit 310 performs an overall resistance test on the EMU safety circuit, including: testing the overall resistance of the safety circuit and the contact resistance of a single relay and contactor in the safety circuit.

[0095] Preferably, the test recording unit 310 tests the contact resistance of a single relay and contactor in the safety circuit, including: using PLC to control the opening and closing of the switch device so that the contacts of each relay and contactor in the safety circuit are sequentially connected in series to the resistance measuring instrument, and then detecting the real-time resistance of the contacts in the circuit.

[0096] Preferably, Figure 4 As shown, the above-mentioned device also includes: an abnormal point detection unit 380, which is respectively connected to the manual processing unit 330 and the oxidation judgment unit 320, and is used to use the PLC to control the opening and closing of the switch device to measure the segmented resistance of the safety circuit to find the abnormal point before entering the manual processing stage, and to issue a system fault prompt when the abnormal line or component is found.

[0097] Preferably, the isolation test unit 350 isolates the relay or contactor contacts having contact oxidation problems in the safety circuit, including: connecting the relay or contactor contacts having contact oxidation problems in the safety circuit in series to a resistance tester using a PLC.

[0098] Preferably, the above-mentioned device also includes: a data recording unit, which is used to store the test result data in a database, and the processor screens the test result data that meet the deoxidation effect standards and retains them, and deletes the test result data that do not meet the standards. The test result data include: the resistance data of the relay and contactor contacts before deoxidation, the resistance data of the relay and contactor contacts after deoxidation, the programmable power supply voltage setting, and the resistance setting of the variable resistor.

[0099] Preferably, Figure 5 As shown, the above-mentioned deoxidation preparation unit 360 includes:

[0100] The data matching module 361 is used to match the test results obtained from the resistance test with the resistance data of the relay and contactor contacts before deoxidation in the database.

[0101] The first adjustment module 362 is used to adjust the output voltage of the variable resistor and the programmable power supply based on the corresponding programmable power supply voltage setting and the resistance setting of the variable resistor in the database when the data matching module matches successfully.

[0102] The second regulating module 363 is used for adjusting the output voltage of the variable resistor and the programmable power supply in coordination until the output current is adjusted to 2A when the data matching module fails to match.

[0103] The detailed description of each of the above units and modules can be found in the corresponding description in the aforementioned method embodiment, which will not be further elaborated here.

[0104] It can be seen from the above technical solution that the EMU safety circuit contact deoxidation device provided by the present application has the following beneficial effects:

[0105] 1. Compared with the prior art that requires disassembling relays and contactors for deoxidation, or connecting special deoxidation tools to the vehicle, the method of the present application does not require disassembling components, and deoxidation operations are performed directly in the safety circuit, which significantly shortens maintenance time, reduces maintenance costs and human resource consumption. This avoids the extra workload and potential damage risks caused by disassembly and installation.

[0106] 2. The method of the present application can accurately locate the contacts that need to be deoxidized through precise resistance testing, thus avoiding the problem of difficulty in targeted operation in existing methods. The combination of programmable power supply and variable resistor can adjust the deoxidation parameters according to the contact material and oxidation degree, ensuring the effectiveness and targeting of the deoxidation treatment, thereby obtaining a better deoxidation effect.

[0107] 3. The method of the present application stores the test results (including resistance data before and after deoxidation, voltage setting, and resistance setting) in a database, which can provide data support for the adjustment of the programmable power supply and variable resistor, thereby achieving better deoxidation effect and higher efficiency.

[0108] An embodiment of the present invention further provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the above method is implemented when the processor executes the program.

[0109] An embodiment of the present invention further provides a computer program product, including a computer program / instruction, which implements the steps of the above method when the computer program / instruction is executed by a processor.

[0110] An embodiment of the present invention further provides a computer-readable storage medium, which stores a computer program for executing the above method.

[0111] like Figure 6 As shown, the electronic device 600 may further include: a communication module 110, an input unit 120, an audio processor 130, a display 160, and a power supply 170. It is worth noting that the electronic device 600 does not necessarily have to include Figure 6 In addition, the electronic device 600 may also include Figure 6 For components not shown, reference may be made to the prior art.

[0112] like Figure 6 As shown, the central processor 100 is sometimes also referred to as a controller or an operation control, and may include a microprocessor or other processor devices and / or logic devices. The central processor 100 receives inputs and controls the operations of various components of the electronic device 600.

[0113] The memory 140 may be, for example, one or more of a cache, a flash memory, a hard drive, a removable medium, a volatile memory, a non-volatile memory or other suitable devices. The above-mentioned information related to the failure may be stored, and a program for executing the relevant information may also be stored. The CPU 100 may execute the program stored in the memory 140 to implement information storage or processing.

[0114] The input unit 120 provides input to the CPU 100. The input unit 120 is, for example, a key or a touch input device. The power supply 170 is used to provide power to the electronic device 600. The display 160 is used to display display objects such as images and text. The display may be, for example, an LCD display, but is not limited thereto.

[0115] The memory 140 may be a solid-state memory, such as a read-only memory (ROM), a random access memory (RAM), a SIM card, etc. It may also be a memory that saves information even when the power is off, can be selectively erased, and is provided with more data, examples of which are sometimes referred to as EPROMs, etc. The memory 140 may also be some other type of device. The memory 140 includes a buffer memory 141 (sometimes referred to as a buffer). The memory 140 may include an application / function storage unit 142, which is used to store application programs and function programs or processes for executing the operation of the electronic device 600 through the central processor 100.

[0116] The memory 140 may also include a data storage unit 143 for storing data, such as contacts, digital data, pictures, sounds, and / or any other data used by the electronic device. The driver storage unit 144 of the memory 140 may include various drivers for communication functions of the electronic device and / or for executing other functions of the electronic device (such as messaging applications, address book applications, etc.).

[0117] The communication module 110 is a transmitter / receiver that transmits and receives signals via the antenna 111. The communication module (transmitter / receiver) is coupled to the central processor 100 to provide input signals and receive output signals, which may be the same as the case of a conventional mobile communication terminal.

[0118] Based on different communication technologies, multiple communication modules 110 may be provided in the same electronic device, such as a cellular network module, a Bluetooth module and / or a wireless local area network module, etc. The communication module (transmitter / receiver) is also coupled to a speaker 131 and a microphone 132 via an audio processor 130 to provide an audio output via the speaker 131 and receive an audio input from the microphone 132, thereby realizing a common telecommunication function. The audio processor 130 may include any suitable buffer, decoder, amplifier, etc. In addition, the audio processor 130 is also coupled to the central processor 100, so that recording can be performed on the local machine through the microphone 132, and the sound stored on the local machine can be played through the speaker 131.

[0119] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0120] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0121] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0122] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0123] The present invention uses specific embodiments to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A method for deoxidizing contacts of a motor vehicle safety circuit, characterized in that: The method comprises: Conduct overall resistance test on the EMU safety circuit and record the test results; Determine whether there is a contact oxidation problem based on the test results; In response to the absence of contact oxidation problem but the safety circuit resistance is abnormal, entering the manual processing stage; In response to the absence of contact oxidation problem and the safety loop resistance being normal, the deoxidation process is terminated; In response to the existence of a contact oxidation problem, the relay or contactor contact having the contact oxidation problem in the safety circuit is isolated, and the isolated contact is tested for resistance again; Performing deoxidation preparation according to the retest result, the deoxidation preparation comprising adjusting the output voltage of the variable resistor and the programmable power supply; While the program-controlled power supply continuously outputs current to the isolation contact, the opening and closing of the isolation contact is controlled to perform a contact deoxidation operation; The resistance test of the deoxidized isolation contacts is performed again to determine whether to continue the deoxidation operation until the resistance of the isolation contacts returns to normal.

2. The method for deoxidizing the contacts of the EMU safety circuit as claimed in claim 1, characterized in that: The overall resistance test of the EMU safety circuit includes: testing the overall resistance of the safety circuit and the contact resistance of a single relay and contactor in the safety circuit.

3. The method for deoxidizing the contact of the EMU safety circuit as claimed in claim 2, characterized in that: Testing the contact resistance of a single relay and contactor in a safety circuit includes: using a PLC to control the opening and closing of a switch device so that the contacts of each relay and contactor in the safety circuit are sequentially connected in series to a resistance measuring instrument, and then detecting the real-time resistance of the contacts in the circuit.

4. The method for deoxidizing the contact of the EMU safety circuit as claimed in claim 1, characterized in that: Before entering the manual processing stage, the method further includes: using PLC to control the opening and closing of switch devices to measure the segmented resistance of the safety circuit to find abnormal points, and when abnormal lines or components are found, a system fault prompt is issued.

5. The method for deoxidizing the contacts of the EMU safety circuit as claimed in claim 1, characterized in that: The isolating the relay or contactor contacts having the contact oxidation problem in the safety circuit includes: using PLC to connect the relay or contactor contacts having the contact oxidation problem in the safety circuit in series to a resistance testing instrument.

6. The method for deoxidizing the contacts of the EMU safety circuit as claimed in claim 1, characterized in that: After the resistance test is performed again on the isolated contacts after deoxidation treatment, the method also includes: storing the test result data in a database, and the processor screens the test result data that meet the deoxidation effect standards and retains them, and deletes the test result data that do not meet the standards. The test result data include: the resistance data of the relay and contactor contacts before deoxidation, the resistance data of the relay and contactor contacts after deoxidation, the programmable power supply voltage setting, and the resistance setting of the variable resistor.

7. The method for deoxidizing the contacts of the EMU safety circuit as claimed in claim 6, characterized in that: Adjusting the output voltage of the variable resistor and programmable power supply in preparation for deoxidation includes: Matching the test results obtained from the resistance test with the resistance data of the relay and contactor contacts before deoxidation in the database; If the match is successful, the output voltage of the variable resistor and the programmable power supply is adjusted based on the corresponding programmable power supply voltage setting and the resistance setting of the variable resistor in the database; If the matching is unsuccessful, the variable resistor and the output voltage of the programmable power supply are adjusted together until the output current is adjusted to 2A.

8. A contact deoxidation device for a motor vehicle safety circuit, characterized in that: The device comprises: Test recording unit, used to perform overall resistance test on the EMU safety circuit and record the test results; An oxidation judgment unit, used to judge whether there is a contact oxidation problem according to the test result; A manual processing unit, used for entering a manual processing stage when the oxidation judgment unit judges that there is no contact oxidation problem, but the safety circuit resistance is abnormal; A process ending unit, used to end the deoxidation process when the oxidation judgment unit determines that there is no contact oxidation problem and the safety loop resistance is normal; An isolation test unit, used for isolating the relay or contactor contact having the contact oxidation problem in the safety circuit when the oxidation judgment unit judges that there is a contact oxidation problem, and performing a resistance test on the isolated contact again; A deoxidation preparation unit, used for performing deoxidation preparation according to the retest result, wherein the deoxidation preparation includes adjusting the output voltage of the variable resistor and the programmable power supply; A deoxidation unit, used to control the opening and closing of the isolation contacts to perform contact deoxidation operation while the programmable power supply continuously outputs current to the isolation contacts; The isolation test unit is also used to perform resistance test on the isolation contacts after deoxidation treatment again to determine whether to continue the deoxidation operation until the resistance of the isolation contacts returns to normal.

9. The EMU safety circuit contact deoxidation device according to claim 8, characterized in that: The test recording unit performs an overall resistance test on the EMU safety circuit, including: testing the overall resistance of the safety circuit and the contact resistance of a single relay and contactor in the safety circuit.

10. The EMU safety circuit contact deoxidation device according to claim 9, characterized in that: The test recording unit tests the contact resistance of a single relay and contactor in a safety circuit, including: using a PLC to control the opening and closing of a switch device so that the contacts of each relay and contactor in the safety circuit are sequentially connected in series to a resistance measuring instrument, and then detecting the real-time resistance of the contacts in the circuit.

11. The EMU safety circuit contact deoxidation device according to claim 8, characterized in that: The device also includes: an abnormal point detection unit, which is used to measure the segmented resistance of the safety circuit by using the PLC to control the opening and closing of the switch device before entering the manual processing stage to find the abnormal point, and to issue a system fault prompt when the abnormal line or component is found.

12. The EMU safety circuit contact deoxidation device according to claim 8, characterized in that: The isolation test unit isolates the relay or contactor contacts with contact oxidation problems in the safety circuit, including: using PLC to connect the relay or contactor contacts with contact oxidation problems in the safety circuit in series to a resistance tester.

13. The EMU safety circuit contact deoxidation device according to claim 8, characterized in that: The device also includes: a data recording unit, which is used to store the test result data in a database, and the processor screens the test result data that meet the deoxidation effect standards and retains them, and deletes the test result data that do not meet the standards. The test result data includes: resistance data of the relay and contactor contacts before deoxidation, resistance data of the relay and contactor contacts after deoxidation, programmable power supply voltage settings, and resistance settings of the variable resistor.

14. The EMU safety circuit contact deoxidation device according to claim 13, characterized in that: The deoxidation preparation unit comprises: A data matching module, used for matching the test results obtained from the resistance test with the resistance data of the relay and contactor contacts before deoxidation in the database; A first adjustment module, used for adjusting the output voltage of the variable resistor and the programmable power supply based on the corresponding programmable power supply voltage setting and the resistance setting of the variable resistor in the database when the data matching module matches successfully; The second regulating module is used for adjusting the output voltage of the variable resistor and the programmable power supply in coordination until the output current is adjusted to 2A when the data matching module fails to match.

15. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

16. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

17. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instructions are executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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