Inertia inspection box integrating overload triggering and key destroying control
By integrating the inertial check box with overload trigger and key destruction control, the problems of single function and unstable signal transmission of the inertial check box are solved, and accurate signal transmission and key destruction control are achieved in the case of aircraft overload. It has a self-test function and provides data support for accident investigation and emergency response.
Patent Information
- Application Number
- CN202422858381.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-22
- Publication Date
- 2025-09-19
- Estimated Expiration
- 2034-11-22
Smart Images
Figure CN223361458U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of avionics, and in particular relates to an inertia inspection box integrating overload triggering and key destruction control. Background Art
[0002] Existing inertial inspection boxes generally only have overload signal acquisition functions or overload signal acquisition functions and overload threshold judgment functions. The functions are relatively simple, and the output of the overload threshold judgment result is generally sent to the key destruction control device via RS-442.
[0003] First, the transmission of signals between devices is greatly affected by the onboard communication cables, and the failure of the onboard cables will directly lead to the failure of signal transmission.
[0004] Secondly, there are also high requirements for the installation locations of the two devices. If the installation locations are far apart, there will be signal transmission delay.
[0005] Third, if an aircraft accident occurs, the communication line between the two devices can easily be destroyed, resulting in signal transmission failure.
[0006] Therefore, an inertial inspection box that integrates overload triggering and key destruction control is needed. The inertial inspection box has the functions of overload signal collection, overload threshold judgment, and key destruction signal output, which can effectively solve the design deficiencies of existing inertial inspection boxes. Utility Model Content
[0007] Purpose of the utility model: to provide an inertia inspection box integrating overload triggering and key destruction control.
[0008] Technical solution:
[0009] An inertial inspection box with integrated overload triggering and key destruction control includes at least two acceleration sensors, two solid-state relays, an indicator light, a current limiting output module, and a control module, wherein:
[0010] The multiple ADC interfaces of the control module are respectively connected to the signal output terminals of the acceleration sensors in the acquisition circuit; the sixth IO interface of the control module is connected to the first ground manual key destruction signal; the seventh IO interface of the control module is connected to the second ground manual key destruction signal; the eighth IO interface of the control module is connected to the first key signal; the ninth IO interface of the control module is connected to the second key signal; the first IO interface of the control module is connected to the signal input contact of the first solid-state relay; the power supply input contact of the first solid-state relay is connected to the 28V power supply of the battery; the signal output contact of the first solid-state relay is connected to the signal input contact of the second solid-state relay; the first IO interface of the control module is connected to the second solid-state relay. The signal input contact of the solid-state relay is connected to the positive input interface of the work / check switch; the signal output contact of the second solid-state relay is connected to the positive input interface of the work / check switch; the control input interface of the current limiting output module is connected to the negative output interface of the switch; the 15V current output interface of the control module is connected to the power input interface of the current limiting output module; the output end of the current limiting output module is divided into 20 independent outputs of 28V voltage and a single current limiting of 2A; the second IO interface of the control module outputs a 422 bus signal; the third IO interface of the control module outputs a key destruction control signal; the fourth IO interface of the control module outputs an overload trigger signal; and the fifth IO interface of the control module outputs a self-test signal.
[0011] Furthermore, the control module includes a peak suppression circuit, a power conversion circuit, and a control circuit, wherein:
[0012] The power input interface of the spike suppression circuit is connected to the 28V DC normal power supply; the power input interface of the power conversion circuit is connected to the 28V DC power output interface of the spike suppression circuit; the first power input interface of the control circuit is connected to the +2.5V DC power output interface of the power conversion circuit; the second power input interface of the control circuit is connected to the +3.5V DC power output interface of the power conversion circuit; the power input interface of the acquisition circuit is connected to the +15V DC power output interface of the power conversion circuit.
[0013] Furthermore, an indicator light is provided between the second solid-state relay and the current-limiting output module.
[0014] Furthermore, the control circuit includes a reset circuit, which is used to complete the system power-on reset and also implement the hardware watchdog function. When an abnormal CPU operation is detected, the system can be reset.
[0015] Furthermore, the power conversion circuit includes an energy storage circuit for enabling normal operation when the onboard power is switched or fluctuates.
[0016] Furthermore, the current limiting output module is used to prevent backflow of rear-end current.
[0017] Beneficial effects:
[0018] The utility model can measure the overload value of the aircraft. It provides data support for automatically judging whether the aircraft is in normal working condition. It can judge the overload value threshold. By receiving the measured aircraft overload value data, it can be judged whether the aircraft is in normal working condition. It outputs a key destruction control signal. The utility model has two gears: inspection / protection and working. When in the inspection / protection gear, the self-detection function can be realized through the indicator light, and the equipment is in the protection state and does not output the key destruction signal; when in the working gear, when it is judged that the external acceleration does not meet the closing condition, or when the dual-redundancy ground manual key destruction signal sent by the data acquisition management processor is received, the relay is attracted after the control signal is sent, and the inertia inspection box outputs the key destruction current to the equipment that needs to be destroyed on the back-end machine.
[0019] This utility model has the function of outputting overload values and key destruction control signals to recording equipment for collection and recording, providing data support for accident investigations. It also has the function of sending an overload trigger signal to emergency survival equipment when the aircraft impact overload exceeds the threshold. It also has the function of transmitting self-test results to data management equipment via a switch signal. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 This is a schematic diagram of an inertial inspection box that integrates overload triggering and key destruction control;
[0021] Figure 2 Circuit principle block diagram of the control module. DETAILED DESCRIPTION
[0022] like Figure 1-2 The utility model is used to monitor the impact overload value signal. When the impact overload value signal reaches the designed threshold, the relay is triggered to output the key destruction control signal to the inertial inspection box. To ensure the accuracy of the inertial inspection box without malfunction, this design uses three independent acceleration sensors to detect the impact value. When the outputs of two or more acceleration sensors simultaneously exceed the judgment threshold set by the inertial inspection box, or when the dual-redundant ground manual key destruction signals are both valid, the 28V, 40A power provided by the battery is divided into 20 independent outputs by turning on two relays. The output is output to the device that needs to destroy the key on the back-end machine through the current limiting output module, with a single current limit of 2A. At the same time, the acceleration overload value and key destruction control signal are sent to the surviving recording device through the RS-422 bus and the 1-channel discrete output interface respectively for accident investigation; the overload trigger signal is output to the emergency control device through the 1-channel discrete output interface for emergency processing.
[0023] This utility model is designed with a spike suppression circuit. This circuit is based on the operating principle of a TVS diode. TVS diodes have extremely fast response times and high surge absorption capabilities. When subjected to a momentary, high-energy surge, the TVS rapidly changes the impedance between them from high to low, absorbing the instantaneous high current and thus clamping the voltage across them to a predetermined value. The lightning protection circuit connects the TVS diode to the power input circuit, effectively protecting the precision components within the circuit from transient high-voltage spikes.
[0024] The utility model is designed with a power conversion circuit, and the converted voltage is used to supply power to an internal acceleration sensor, a microprocessor, etc.
[0025] The power conversion circuit in this utility model includes an input power reverse polarity protection circuit. The 28V DC power supply onboard the device requires reverse polarity protection. This design utilizes the commonly used input power reverse polarity protection by inserting a rectifier diode in series with the power circuit, utilizing the diode's unidirectional conduction characteristics to protect downstream electrical components.
[0026] The power conversion circuit designed in the utility model has an energy storage circuit, which can ensure normal operation when the onboard power is switched or fluctuates.
[0027] The utility model is designed with a control module, which is responsible for controlling data collection, data calculation, outputting a key-destroying control signal to a key control module, and sending the acceleration overload value and the key-destroying control signal to a recording device via an RS-422 bus.
[0028] The control module of the utility model is designed with a reset circuit. The reset circuit is used to complete the system power-on reset. The circuit also implements a hardware watchdog function, which can reset the system when an abnormal CPU operation is detected.
[0029] The control module of the utility model has an acquisition circuit which uses an operational amplifier to form a voltage follower and sends the acquired acceleration sensor signal to the control module for threshold judgment.
[0030] This utility model's control module includes a key control module. After the input power passes through a voltage regulator circuit, a detection circuit detects the input power and determines whether the external check button is on. In the figure, X1 and X2 are connected to the external buttons. When the external buttons are pressed, X1 and X2 are connected. To prevent accidental touches, two external buttons are placed on either side of the key-destroying control box, connected in series. Only when both switches are pressed simultaneously can the key be turned on.
[0031] This utility model's control module incorporates an artificial key-destroying signal acquisition circuit. Its core function is to collect the key-destroying control signal ("28V" / "ground") and the dual-redundant ground artificial key-destroying signal ("28V" / "open") provided by the control module. Both signals are valid at "28V." When the circuit receives the "28V" signal, it turns on the MOS transistor and outputs a "ground" signal to the back-end circuit.
[0032] The control module of this utility model includes an output control module. The output control module receives signals from the key control module and the signal from the manual key destruction signal acquisition circuit. Both of these signals are "ground" / "floating" signals. When the circuit receives a valid "ground" signal, it controls relays 1 and 2 to conduct, triggering the key destruction function.
[0033] The utility model designs a current-limiting output module in the control module. In order to avoid the situation where one of the externally connected devices is short-circuited, resulting in the failure of the other paths to be destroyed, the current-limiting output module is provided and includes a back-end current backflow prevention function.
[0034] 1. When in the inspection / protection position, switch 1 is in the inspection / protection position. In this state, the device is in a protection state and does not output a key-destroying signal. At this time, press button 1 and button 2 at the same time, the indicator light will light up, and the self-test function can be realized by observing the indicator light status;
[0035] 2. When in working position, if any of the following three conditions are met, the inertia check box will output key-destroying current to the device on the back-end machine that needs to destroy the key.
[0036] a) The external acceleration overload value meets the closing condition;
[0037] b) receiving a key-destroying signal from a front-end device;
[0038] c) Button 1 and Button 2 are pressed simultaneously.
Claims
1. An inertial inspection box with integrated overload trigger and key destruction control, characterized in that: It includes at least two acceleration sensors, two solid-state relays, an indicator light, a current limiting output module, and a control module, wherein: The multiple ADC interfaces of the control module are respectively connected to the signal output terminals of the acceleration sensors in the acquisition circuit; the sixth IO interface of the control module is connected to the first ground manual key destruction signal; the seventh IO interface of the control module is connected to the second ground manual key destruction signal; the eighth IO interface of the control module is connected to the first key signal; the ninth IO interface of the control module is connected to the second key signal; the first IO interface of the control module is connected to the signal input contact of the first solid-state relay; the power supply input contact of the first solid-state relay is connected to the 28V power supply of the battery; the signal output contact of the first solid-state relay is connected to the signal input contact of the second solid-state relay; the first IO interface of the control module is connected to the second solid-state relay. The signal input contact of the solid-state relay is connected to the positive input interface of the work / check switch; the signal output contact of the second solid-state relay is connected to the positive input interface of the work / check switch; the control input interface of the current limiting output module is connected to the negative output interface of the switch; the 15V current output interface of the control module is connected to the power input interface of the current limiting output module; the output end of the current limiting output module is divided into 20 independent outputs of 28V voltage and a single current limiting of 2A; the second IO interface of the control module outputs a 422 bus signal; the third IO interface of the control module outputs a key destruction control signal; the fourth IO interface of the control module outputs an overload trigger signal; and the fifth IO interface of the control module outputs a self-test signal.
2. The inertial inspection box with integrated overload triggering and key destruction control according to claim 1, characterized in that: The control module includes a peak suppression circuit, a power conversion circuit, and a control circuit, wherein: The power input interface of the spike suppression circuit is connected to the 28V DC normal power supply; the power input interface of the power conversion circuit is connected to the 28V DC power output interface of the spike suppression circuit; the first power input interface of the control circuit is connected to the +2.5V DC power output interface of the power conversion circuit; the second power input interface of the control circuit is connected to the +3.5V DC power output interface of the power conversion circuit; the power input interface of the acquisition circuit is connected to the +15V DC power output interface of the power conversion circuit.
3. The inertial inspection box with integrated overload triggering and key destruction control according to claim 1, characterized in that: An indicator light is also provided between the second solid state relay and the current limiting output module.
4. The inertial inspection box with integrated overload triggering and key destruction control according to claim 1, characterized in that: The control circuit includes a reset circuit, which is used to complete the system power-on reset and also implement the hardware watchdog function. When an abnormal CPU operation is detected, the system can be reset.
5. The inertial inspection box with integrated overload triggering and key destruction control according to claim 2, characterized in that: The power conversion circuit has an energy storage circuit to ensure normal operation when the onboard power is switched or fluctuates.
6. The inertial inspection box with integrated overload triggering and key destruction control according to claim 1, characterized in that: The current limiting output module is used to prevent backflow of current from the rear end.