Method for judging channel fault of solid-state power distribution device of electromechanical system
By obtaining six input conditions in the solid-state distribution device for fault status classification and confirmation and judgment, the problem of misjudgment of channel fault judgment in the prior art is solved, and the judgment accuracy and equipment reliability are improved.
Patent Information
- Application Number
- CN202411906244.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2025-03-28
AI Technical Summary
In the prior art, the fault judgment of solid-state distribution device channels is prone to misjudgment, resulting in false alarms and inaccurate judgments.
By obtaining six input conditions in the SSPC channel control module software, classifying known fault status, and recording the fault status classification information in the NVM of the corresponding device. The upper-level application driver module calls this information for fault confirmation and judgment, and is determined as a fault only when a known or defined fault condition is met.
It improves the accuracy of channel fault judgment of solid-state distribution devices, reduces the occurrence of false alarms, helps the maintenance personnel accurately grasp the status of each channel and improves the reliability of the equipment.
Smart Images
Figure CN119719859A_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the field of reporting channel status of a solid-state power distribution device of an aircraft electromechanical system, and in particular, relates to a method for determining channel faults of a solid-state power distribution device of an electromechanical system. Background Art
[0002] The aircraft electromechanical system includes dozens of subsystems such as power supply system, hydraulic system, environmental control system, fuel system, lighting system, etc. For the control and management of these subsystems, modern aircraft usually use distributed architecture and intelligent management. Intelligent power distribution based on solid-state power distribution is the key technology to realize the intelligentization, miniaturization and lightweight of electromechanical control system. Different from the traditional circuit breaker power distribution method, solid-state power distribution can realize the on-off control of loads, provide comprehensive protection for power supply and distribution system when load or distribution line fails, and provide real-time feedback on the status of distribution system to realize highly autonomous operation of power supply system. The solid-state power distribution device uploads the internal SSPC channel status to the electromechanical core processor through the bus, and finally uploads it to the central maintenance system. When the ground power is turned on for inspection, the system test interface can be entered to view the equipment maintenance screen page, which is conducive to the maintenance personnel to grasp the load status in a timely and accurate manner. In the event of a fault, relevant information can be obtained through this interface, which effectively promotes fault troubleshooting and location.
[0003] There are 7 types of reporting states for solid-state power distribution devices, namely: connected with output, disconnected without output, connected without input, overload protection, short circuit protection, unknown and fault. Among them, the unknown state refers to the failure to successfully obtain the channel status function. The logic of reporting faults is: when the underlying software successfully obtains the channel status function and does not belong to the first 5 normal states mentioned above, the fault state will be reported. There are two disadvantages in such fault reporting logic: ① The current fault reporting logic range on the machine is too large, the channel status fault reporting logic is not well considered, and the fault state is not specifically defined and identified. All unidentified states should not be considered as fault states and reported. ② The SSPC channel fault judgment logic may occasionally fail to meet the back-end load characteristics. For example, the inductive load will induce voltage for a short time when it is turned off. Such special working conditions are normal and should not be judged as faults. However, according to the current fault judgment logic, there is a possibility of false alarms, resulting in false alarms and affecting the judgment of maintenance personnel.
[0004] Therefore, how to improve the accuracy of judging channel faults in solid-state power distribution devices is a problem that needs to be solved. Summary of the invention
[0005] The purpose of the present application is to provide a method for determining a channel fault of a solid-state power distribution device in an electromechanical system, so as to solve the problem that a channel fault of a solid-state power distribution device is prone to misjudgment in the prior art.
[0006] The technical solution of the present application is: a method for determining a channel fault of a solid-state power distribution device in an electromechanical system, comprising:
[0007] Obtain the six major input conditions in the SSPC channel control module software, classify known fault states, and record the fault state classification information in the NVM of the corresponding device;
[0008] The SSPC channel control module software reports the periodically collected internal SSPC status information to the SSPC channel management module software in real time through the internal SCI bus. The SSPC channel management module software then forwards the data to the acquisition module software through the internal CAN bus. The acquisition module software then packages the bus bar status information and the internal SSPC status information, and reports the data to the upper application driver module through the dual-port RAM.
[0009] The upper-layer application driver module calls the fault status classification information in the device NVM, and summarizes the collected load status information, SSPC BIT information, and the bus input voltage status of the acquisition module to perform fault confirmation judgment to determine whether it is a known fault state. If so, it is determined to be a fault; if not, it is not defined as a known fault.
[0010] Preferably, the six major input conditions include bus input voltage, SSPC channel output voltage, SSPC channel output current, SSPC channel control instruction, SSPC channel overload protection and SSPC channel short circuit protection.
[0011] Preferably, the bus input voltage is collected by the main control board collection module for 3-way DC and 3-phase AC power bus input voltages, and the judgment conditions are: DC voltage>18V, DC voltage<14V, and the previous state is maintained between 14-18V; AC voltage>90V, AC voltage<70V, and the previous state is maintained between 70-90V.
[0012] Preferably, the SSPC channel output voltage is collected by each SSPC control module, and the judgment conditions are: DC voltage>18V, DC voltage<14V, and the previous state is maintained between 14-18V; AC voltage>90V, AC voltage<70V, and the previous state is maintained between 70-90V.
[0013] Preferably, the SSPC channel output current is collected by each SSPC control module, and the judgment condition is: the output current is less than 15% of the rated current, which is a light load.
[0014] Preferably, the SSPC channel control instruction Drv is acquired by each SSPC control module to collect the driving voltage of the MOS tube. If the MOS tube has a driving voltage Drv=1, and if the MOS tube has no driving voltage Drv=0.
[0015] Preferably, the SSPC channel overload protection ITRIP is provided by each SSPC control module according to the collected output current and in combination with the I2T curve. When an overload occurs, ITRIP=0 and TRIP=1.
[0016] Preferably, the SSPC channel short-circuit protection is performed by each SSPC control module according to the collected output current. When the SSPC output current is ≥9 times the rated current, the short-circuit protection is immediately executed. When a short circuit occurs, ITRIP=1, TRIP=1, and the other states are unreasonable.
[0017] Preferably, the known fault states are divided into four categories: no input but output, SSPC on but no output, SSPC protection but output, and SSPC off but output.
[0018] Preferably, when confirming a fault, filtering measures are taken in the SSPC channel control module software to confirm the fault status.
[0019] Preferably, the internal SSPC status information includes SSPC output status and load current.
[0020] Compared with the current fault logic judgment method, the method for judging channel faults of solid-state distribution devices in electromechanical systems of the present application performs causal logic judgment based on six major input conditions, and determines that a known or defined fault condition can be determined as a fault; unidentified states formed by using inaccurate judgment information or insufficient information or external unknown factors are unusable and should not be defined as known faults; at the same time, taking into account the different load characteristics, the fault reporting logic for different loads is comprehensively considered, so that the channel status reporting is more accurate, which helps maintenance personnel to timely grasp the status of each channel and improve the reliability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the technical solution provided by the present application, the following is a brief introduction to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present application.
[0022] Figure 1 This is a schematic diagram of the overall process of this application;
[0023] Figure 2 This is the SSPC channel status reporting link diagram for this application. DETAILED DESCRIPTION
[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0025] A method for judging channel faults of solid-state power distribution devices in electromechanical systems comprehensively considers six major input conditions of SSPC channels and the diversity of loads, effectively improving the accuracy of equipment reporting status and improving equipment reliability.
[0026] like Figure 1 , including the following steps:
[0027] Step S100, obtaining six major input conditions in the SSPC channel control module software, classifying known fault states, and recording the fault state classification information in the NVM of the corresponding device, which is beneficial to subsequent fault troubleshooting of the device.
[0028] Preferably, six input conditions in the SSPC channel control module software are obtained, specifically:
[0029] a) Bus input voltage (VIN)
[0030] The main control board acquisition module collects the input voltages of 3-way DC and 3-phase AC power busbars, and the judgment conditions are: DC voltage>18V (VIN=1), DC voltage<14V (VIN=0), and the previous state is maintained between 14-18V; AC voltage>90V (VIN=1), AC voltage<70V (VIN=0), and the previous state is maintained between 70-90V.
[0031] b) SSPC channel output voltage (VOUT)
[0032] Each SSPC control module collects the SSPC output voltage, and the judgment conditions are: DC voltage>18V (VOUT=1), DC voltage<14V (VOUT=0), and the previous state is maintained between 14-18V; AC voltage>90V (VOUT=1), AC voltage<70V (VOUT=0), and the previous state is maintained between 70-90V.
[0033] c) SSPC channel output current (AOUT)
[0034] Each SSPC control module collects the SSPC output current, and the judgment condition is: output current <15% rated current is light load (AOUT = 0, output current ≥15% rated current is not light load)
[0035] (AOUT=1).
[0036] d) SSPC channel control command (Drv)
[0037] The driving voltage of the MOS tube is collected by each SSPC control module. If the MOS tube has a driving voltage Drv=1, and if the MOS tube has no driving voltage Drv=0.
[0038] e)SSPC channel overload protection (ITRIP)
[0039] Each SSPC control module performs protection based on the collected output current and the I2T curve. In the event of overload, ITRIP=0 and TRIP=1.
[0040] f)SSPC channel short circuit protection (TRIP)
[0041] Each SSPC control module performs protection according to the collected output current. When the SSPC output current is ≥9 times the rated current, short-circuit protection is immediately performed. When a short circuit occurs, ITRIP=1, TRIP=1, and the other states are unreasonable.
[0042] According to the combination logic of the six input conditions, the following 14 known fault states are obtained:
[0043]
[0044]
[0045] Based on the channel status obtained from the above table, and taking into account the diversity of distribution loads, especially inductive loads, there is still output voltage after shutdown.
[0046] Preferably, the 14 known fault states are divided into four categories: no input but output, SSPC connected but no output, SSPC protected but output, and SSPC disconnected but output.
[0047] Step S200, as Figure 2 The SSPC channel control module software reports the periodically collected SSPC output status, load current and other internal SSPC status information to the SSPC channel management module software in real time through the internal SCI bus. The SSPC channel management module software then forwards the data to the acquisition module software through the internal CAN bus. The acquisition module software then packages the bus bar status information and the internal SSPC status information, and reports the data to the upper-level application driver module through the dual-port RAM.
[0048] In step S300, the upper-layer application driver module calls the fault status classification information in the device NVM, and summarizes the collected load status information, SSPC BIT information and the bus input voltage status of the acquisition module to perform fault confirmation judgment to determine whether it is a known fault state. If so, it is determined to be a fault; if not, it is not defined as a known fault.
[0049] Preferably, when confirming a fault, filtering measures are taken in the SSPC channel control module software to confirm the fault status.
[0050] To sum up, compared with the current fault logic judgment method, this application performs causal logic judgment based on six major input conditions, and determines that a known or defined fault condition can be determined as a fault; unidentified states formed by using inaccurate judgment information or insufficient information or external unknown factors are unusable and should not be defined as known faults; at the same time, taking into account the different load characteristics, the fault reporting logic for different loads is comprehensively considered, so that the channel status reporting is more accurate, which helps maintenance personnel to grasp the status of each channel in a timely manner and improve the reliability of equipment.
[0051] Finally, it should be noted that: the drawings of the embodiments disclosed in the present invention only involve structures related to the embodiments disclosed in the present invention, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other;
[0052] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A method for determining a channel fault in a solid-state power distribution device of an electromechanical system, characterized in that: include: Obtain the six major input conditions in the SSPC channel control module software, classify known fault states, and record the fault state classification information in the NVM of the corresponding device; The SSPC channel control module software reports the periodically collected internal SSPC status information to the SSPC channel management module software in real time through the internal SCI bus. The SSPC channel management module software then forwards the data to the acquisition module software through the internal CAN bus. The acquisition module software then packages the bus bar status information and the internal SSPC status information, and reports the data to the upper application driver module through the dual-port RAM. The upper-layer application driver module calls the fault status classification information in the device NVM, and summarizes the collected load status information, SSPC BIT information, and the bus input voltage status of the acquisition module to perform fault confirmation judgment to determine whether it is a known fault state. If so, it is determined to be a fault; if not, it is not defined as a known fault.
2. The method for determining channel failure of a solid-state power distribution device in an electromechanical system according to claim 1, characterized in that: The six major input conditions include bus input voltage, SSPC channel output voltage, SSPC channel output current, SSPC channel control command, SSPC channel overload protection and SSPC channel short circuit protection.
3. The method for determining channel failure of a solid-state power distribution device in an electromechanical system according to claim 2, characterized in that: The bus input voltage is collected by the main control board acquisition module. The 3-way DC and 3-phase AC power bus input voltages are determined as follows: DC voltage>18V, DC voltage<14V, and the previous state is maintained between 14-18V; AC voltage>90V, AC voltage<70V, and the previous state is maintained between 70-90V.
4. The method for determining channel failure of a solid-state power distribution device in an electromechanical system according to claim 2, wherein: The SSPC channel output voltage is collected by each SSPC control module. The judgment conditions are: DC voltage>18V, DC voltage<14V, and the previous state is maintained between 14-18V; AC voltage>90V, AC voltage<70V, and the previous state is maintained between 70-90V.
5. The method for determining channel failure of a solid-state power distribution device in an electromechanical system according to claim 2, characterized in that: The SSPC channel output current is collected by each SSPC control module. The judgment condition is: output current <15% rated current is light load.
6. The method for determining channel failure of a solid-state power distribution device in an electromechanical system according to claim 2, characterized in that: The SSPC channel control instruction Drv is collected by each SSPC control module to obtain the driving voltage of the MOS tube. If the MOS tube has a driving voltage Drv=1, and if the MOS tube has no driving voltage Drv=0.
7. The method for determining channel failure of a solid-state power distribution device in an electromechanical system according to claim 2, characterized in that: The SSPC channel overload protection ITRIP is provided by each SSPC control module based on the collected output current and combined with the I2T curve. When an overload occurs, ITRIP=0 and TRIP=1.
8. The method for determining channel failure of a solid-state power distribution device in an electromechanical system according to claim 2, characterized in that: The SSPC channel short-circuit protection is performed by each SSPC control module according to the collected output current. When the SSPC output current is ≥9 times the rated current, short-circuit protection is immediately executed. When a short circuit occurs, ITRIP=1, TRIP=1, and the other states are unreasonable.
9. The method for determining channel failure of a solid-state power distribution device in an electromechanical system according to claim 1, characterized in that: The known fault states are divided into four categories: no input but output, SSPC on but no output, SSPC protection but output, and SSPC off but output.
10. The method for determining channel failure of a solid-state power distribution device in an electromechanical system according to claim 1, characterized in that: When confirming a fault, filtering measures are taken in the SSPC channel control module software to confirm the fault status.
11. The method for determining channel failure of a solid-state power distribution device in an electromechanical system according to claim 1, characterized in that: The internal SSPC status information includes the SSPC output status and load current.