CN115494821B - Strong electromagnetic pulse protection design method for engine controller circuit - Google Patents
Strong electromagnetic pulse protection design method for engine controller circuit Download PDFInfo
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- CN115494821B CN115494821B CN202211034191.4A CN202211034191A CN115494821B CN 115494821 B CN115494821 B CN 115494821B CN 202211034191 A CN202211034191 A CN 202211034191A CN 115494821 B CN115494821 B CN 115494821B
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- 238000013461 design Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000012360 testing method Methods 0.000 claims abstract description 33
- 230000035945 sensitivity Effects 0.000 claims abstract description 32
- 238000002347 injection Methods 0.000 claims abstract description 25
- 239000007924 injection Substances 0.000 claims abstract description 25
- 238000004088 simulation Methods 0.000 claims abstract description 13
- 230000008878 coupling Effects 0.000 claims abstract description 11
- 238000010168 coupling process Methods 0.000 claims abstract description 11
- 238000005859 coupling reaction Methods 0.000 claims abstract description 11
- 238000010998 test method Methods 0.000 claims abstract description 5
- 230000001808 coupling effect Effects 0.000 claims abstract description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 abstract description 4
- 239000000523 sample Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0218—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults
- G05B23/0221—Preprocessing measurements, e.g. data collection rate adjustment; Standardization of measurements; Time series or signal analysis, e.g. frequency analysis or wavelets; Trustworthiness of measurements; Indexes therefor; Measurements using easily measured parameters to estimate parameters difficult to measure; Virtual sensor creation; De-noising; Sensor fusion; Unconventional preprocessing inherently present in specific fault detection methods like PCA-based methods
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Tests Of Electronic Circuits (AREA)
Abstract
The invention discloses a design method for protecting strong electromagnetic pulse of an engine controller circuit. Carrying out electromagnetic sensitivity test on the controller by a large-current injection test method to obtain a sensitive frequency point, a sensitive threshold value and a sensitive phenomenon of the controller; constructing a controller terminal circuit model, simulating the coupling of the controller terminal circuit model under the injection of large current, and reproducing the sensitivity phenomenon of the controller; designing a controller circuit by a numerical simulation calculation method, and adding a protection circuit at the front end of a circuit control chip to ensure that the controller circuit can normally work under strong electromagnetic pulse interference; through the design of the controller circuit, the output signal of the circuit under the strong electromagnetic pulse coupling effect is obtained, and the correctness of the design of the protection circuit is verified. The method of the path optimizes and protects the sensitive circuit, and solves the problems that the test can only test specific frequency and the sensitive frequency point position can not be accurately found. Meanwhile, the design cost is greatly reduced, and the subsequent rectifying time is shortened.
Description
Technical Field
The invention relates to the field of electromagnetic compatibility, in particular to a design method for protecting strong electromagnetic pulse of an engine controller circuit.
Background
The aeroengine control system controller is used as a core component of the control system, plays an important role in realizing system functions, but continuously exposes the defect of high electromagnetic sensitivity in the process of rapidly developing electronic elements; particularly when subjected to strong electromagnetic pulses, can cause significant damage to the control system. How to increase the disturbance resistance of electronic control systems against strong electromagnetic pulses is an object of increasing attention of technological staff.
The invention designs a design method for protecting strong electromagnetic pulse of an engine controller circuit, which is mainly based on a field-circuit cooperation protection design method, and is used for detecting a sensitive port, a sensitive threshold and a sensitive phenomenon based on a BCI test, constructing a terminal circuit by a numerical simulation calculation method, reproducing the reason for the generation of the sensitive phenomenon and determining a sensitive element of the controller. The method of the path optimizes and protects the sensitive circuit, improves the survivability of the control system under strong electromagnetic pulse, and reduces the electromagnetic sensitivity of the control system.
Disclosure of Invention
The invention aims to: the invention aims to prevent signals of a controller terminal from being interfered by external electromagnetic pulses and prevent misoperation of a control system caused by strong electromagnetic pulse interference or damage to a circuit. The method of the path optimizes and protects the sensitive circuit, solves the problem that the test can only test specific frequency and cannot accurately find the position of the sensitive frequency point, and the protection circuit can reduce the electromagnetic sensitivity of the controller, improve the anti-interference capability of the control system and ensure the normal operation of the controller.
The invention adopts the following technical scheme:
a design method for protecting strong electromagnetic pulse of an engine controller circuit comprises the following steps:
1) Carrying out electromagnetic sensitivity test on the controller by a large-current injection test method to obtain a sensitive frequency point, a sensitive threshold value and a sensitive phenomenon of the controller;
2) Constructing a controller terminal circuit model, simulating the coupling of the controller terminal circuit model under the injection of large current, and reproducing the sensitivity phenomenon of the controller;
3) Designing a controller circuit by a numerical simulation calculation method, and adding a protection circuit at the front end of a circuit control chip to ensure that the controller circuit can normally work under strong electromagnetic pulse interference;
4) And 3) obtaining an output signal of the circuit under the strong electromagnetic pulse coupling effect through the design of the controller circuit in the step 3), and verifying the correctness of the design of the protection circuit.
Further, the step 2) specifically includes: according to the large current injection test result and the control system impedance simulation, a controller terminal numerical model is established for analysis, and a coupling signal of the model under the strong electromagnetic pulse injection is obtained; the reproduction of the controller sensitivity phenomenon is realized by comparing signals of a controller signal port and a circuit internal port in a large current injection test with a numerical simulation coupling signal.
Further, the step 3) specifically includes:
introducing the controller circuit in the step 2) into Multisim, establishing a controller circuit model, selecting a circuit protection element according to the sensitivity threshold obtained in the electromagnetic sensitivity test in the step 1), and filtering the amplitude of the controller circuit; according to the sensitive frequency points obtained in the electromagnetic sensitivity test in the step 1), an LC filter circuit is built in Multisim to filter signals of the controller circuit; and adding the added circuit protection element and the LC filter circuit at the front section of the circuit control chip to complete the protection design of the controller circuit.
Further, the specific method for verifying the correctness of the protection circuit design in step 4) is as follows:
verifying the correctness of the controller circuit designed in the step 3) by performing electromagnetic sensitivity test on the controller circuit; the redesigned controller is not sensitive in the test process, and the design of the protection circuit is considered to be correct.
The beneficial effects are that:
according to GJB151B-2013, the large current injection test method is to select pulse signals with frequencies of 10kHz, 100kHz, 1MHz, 10MHz, 30MHz and 100MHz to be injected into a control system, and only whether the electromagnetic sensitivity phenomenon occurs in the control system can be observed in the test, wherein the internal factor of the electromagnetic sensitivity phenomenon is that an integrated chip on a controller circuit works abnormally, but sensitive electronic elements of the controller circuit cannot be intuitively found in the test. The invention analyzes the controller circuit through the circuit simulation software, can flexibly adjust the frequency of the pulse injection signal, and accurately obtains the electromagnetic sensitive element of the controller circuit.
After the circuit is optimally designed, the controller protection circuit can ensure that the pulse injection signal is filtered when the electromagnetic sensitivity phenomenon occurs in the control system, so that the pulse signal cannot interfere with an integrated chip on the controller circuit, the electromagnetic sensitivity phenomenon of the control system is avoided in the electromagnetic sensitivity test, and the aim of reducing the electromagnetic sensitivity of the controller is fulfilled. Meanwhile, the design cost is greatly reduced, and the subsequent rectifying time is shortened.
Drawings
FIG. 1 is a high current injection test layout;
FIG. 2 is a flow chart of a guard design analysis;
FIG. 3 is a graph of a pulse current injection signal;
FIG. 4 is a diagram of controller terminal coupling signals;
FIG. 5 is a circuit diagram of a power terminal;
fig. 6 is a waveform diagram of the controller output.
Detailed Description
The invention is described in further detail below with reference to the examples of the drawings. Those skilled in the art will appreciate that these descriptions are merely illustrative, exemplary, and should not be construed as limiting the scope of the invention.
FIG. 1 is a test layout of the present invention consisting of a DC power supply, a dielectric spacer, an injection probe, a detection probe, an EUT conductive plate and a ground strap.
FIG. 2 is a flow chart of a guard design analysis.
A design method for protecting strong electromagnetic pulse of an engine controller circuit comprises the following steps:
1) Carrying out electromagnetic sensitivity test on the controller by a large-current injection test method to obtain a sensitive frequency point, a sensitive threshold value and a sensitive phenomenon of the controller;
2) Constructing a controller terminal circuit model, simulating the coupling of the controller terminal circuit model under the injection of large current, and reproducing the sensitivity phenomenon of the controller; according to the large current injection test result and the control system impedance simulation, a controller terminal numerical model is established for analysis, and a coupling signal of the model under the strong electromagnetic pulse injection is obtained; the reproduction of the controller sensitivity phenomenon is realized by comparing signals of a controller signal port and a circuit internal port in a large current injection test with a numerical simulation coupling signal.
3) Designing a controller circuit by a numerical simulation calculation method, and adding a protection circuit at the front end of a circuit control chip to ensure that the controller circuit can normally work under strong electromagnetic pulse interference; introducing the controller circuit in the step 2) into Multisim, establishing a controller circuit model, selecting a circuit protection element according to the sensitivity threshold obtained in the electromagnetic sensitivity test in the step 1), and filtering the amplitude of the controller circuit; according to the sensitive frequency points obtained in the electromagnetic sensitivity test in the step 1), an LC filter circuit is built in Multisim to filter signals of the controller circuit; and adding the added circuit protection element and the LC filter circuit at the front section of the circuit control chip to complete the protection design of the controller circuit.
4) And 3) obtaining an output signal of the circuit under the strong electromagnetic pulse coupling effect through the design of the controller circuit in the step 3), and verifying the correctness of the design of the protection circuit.
Verifying the correctness of the controller circuit designed in the step 3) by performing electromagnetic sensitivity test on the controller circuit; the redesigned controller is not sensitive in the test process, and the design of the protection circuit is considered to be correct.
Specifically, the invention uses the current injection probe to inject large current into the controller port, transmits the voltage signals of the monitoring probe and the controller port to the oscilloscope for display and storage, monitors abnormal states such as faults of the controller, determines the sensitive threshold value of the circuit, and injects the signals as shown in figure 3. Numerical simulation is inconvenient because the controller harness structure is complex, the size is long, and the controller harness structure comprises a plurality of port connectors to be installed. According to the large current injection test result and the control system impedance simulation, a numerical model of a controller terminal is established for analysis, a power supply terminal circuit is shown in fig. 5, and pulse interference waveforms shown in fig. 6 can be generated at two ends of a multi-sim simulation power supply module.
The strong electromagnetic pulse signal will interfere with the electronic components during the circuit transmission process, and interfere with the implementation of the controller function, producing the output waveform shown in fig. 6.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (2)
1. The design method for the strong electromagnetic pulse protection of the engine controller circuit is characterized by comprising the following steps of:
1) Carrying out electromagnetic sensitivity test on the controller by a large-current injection test method to obtain a sensitive frequency point, a sensitive threshold value and a sensitive phenomenon of the controller;
2) Constructing a controller terminal circuit model, simulating the coupling of the controller terminal circuit model under the injection of large current, and reproducing the sensitivity phenomenon of the controller;
3) Introducing the controller circuit in the step 2) into Multisim, establishing a controller circuit model, selecting a circuit protection element according to the sensitivity threshold obtained in the electromagnetic sensitivity test in the step 1), and filtering the amplitude of the controller circuit; according to the sensitive frequency points obtained in the electromagnetic sensitivity test in the step 1), an LC filter circuit is built in Multisim to filter signals of the controller circuit; adding the added circuit protection element and the LC filter circuit at the front end of the circuit control chip to complete the protection design of the controller circuit;
4) The correctness of the design of the protection circuit is verified by designing the controller circuit in the step 3) to obtain an output signal of the circuit under the strong electromagnetic pulse coupling effect;
the step 2) specifically comprises the following steps: according to the large current injection test result and the control system impedance simulation, a controller terminal numerical model is established for analysis, and a coupling signal of the model under the strong electromagnetic pulse injection is obtained; the reproduction of the controller sensitivity phenomenon is realized by comparing signals of a controller signal port and a circuit internal port in a large current injection test with a numerical simulation coupling signal.
2. The engine controller circuit strong electromagnetic pulse protection design method according to claim 1, characterized in that: the specific method for verifying the correctness of the design of the protection circuit in the step 4) comprises the following steps:
verifying the correctness of the controller circuit designed in the step 3) by performing electromagnetic sensitivity test on the controller circuit; the redesigned controller is not sensitive in the test process, and the design of the protection circuit is considered to be correct.
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|---|---|---|---|
| CN202211034191.4A CN115494821B (en) | 2022-08-26 | 2022-08-26 | Strong electromagnetic pulse protection design method for engine controller circuit |
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| CN202211034191.4A CN115494821B (en) | 2022-08-26 | 2022-08-26 | Strong electromagnetic pulse protection design method for engine controller circuit |
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| CN115494821B true CN115494821B (en) | 2024-04-12 |
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