CN109353528B

CN109353528B - Impact detection sensor realized based on impact safety discrimination method

Info

Publication number: CN109353528B
Application number: CN201811053918.7A
Authority: CN
Inventors: 山磊; 田军; 傅康毅; 屠晓涛
Original assignee: Shaanxi Qianshan Avionics Co Ltd
Current assignee: Shaanxi Qianshan Avionics Co Ltd
Priority date: 2018-09-11
Filing date: 2018-09-11
Publication date: 2021-11-12
Anticipated expiration: 2038-09-11
Also published as: CN109353528A

Abstract

The invention belongs to the technical field of avionics, and discloses an impact detection sensor realized based on an impact safety judgment method, which comprises a power module (1) and an impact detection processing module (2), wherein three axial impact accelerations of an airplane are acquired by adopting a dual-interface redundancy and dual voting mode, and discrete quantity signals are output when the impact accelerations exceed an acceleration threshold value and duration time specified by a protocol. According to the invention, a mode of 'dual-interface redundancy + dual voting' is adopted, and the impact acceleration threshold and the duration are determined doubly, so that the reliability and the safety of the product are high; meanwhile, two key parameters of the impact acceleration threshold and the duration can be set through software, so that the product can adapt to the falling and collision working conditions of multiple machines.

Description

Impact detection sensor realized based on impact safety discrimination method

Technical Field

The invention belongs to the technical field of avionics, and particularly relates to an impact detection sensor realized based on an impact safety discrimination method.

Background

With the increasing progress of the aviation aircraft in the mission, the frequency of the occurrence of the aircraft-level accidents is higher and higher, and in order to ensure that the aircraft can complete certain specific and critical work (such as separation of critical equipment) in a short time when major accidents (such as crash and the like) occur, the abnormal state of the aircraft needs to be detected and judged.

The impact detection sensor is used for sensing and acquiring the triaxial impact acceleration of the airplane, and outputs discrete magnitude signals when the change of the impact acceleration is found to be abnormal and exceeds a specified threshold value and is continuous, so that the on-board related equipment can be triggered and guaranteed to be started normally.

Disclosure of Invention

The purpose of the invention is as follows: the invention aims to provide an impact detection sensor realized by an impact safety judgment method, which is used for effectively identifying impact under the condition of accidental crash of an airplane, so that the normal starting work of key equipment for positioning accidents can be ensured.

The technical scheme is as follows:

the impact detection sensor based on the impact safety discrimination method comprises a power module (1) and an impact detection processing module (2), and is characterized in that the impact acceleration of three axial directions of an airplane is obtained by adopting a dual-interface redundancy and dual voting mode, and when the impact acceleration exceeds an acceleration threshold value and duration time specified by a protocol, discrete magnitude signals are output.

The impact detection processing module (2) comprises an MEMS acceleration sensor (3), a processor (4), an ADC (analog to digital converter) (5), a memory (6), a solid-state relay (7) and an interface driver (8), the impact detection processing module (2) controls an analog-to-digital converter to carry out digital quantization and filtering on output signals of the MEMS acceleration sensor through the processor, the acquisition purpose of impact signals is achieved, the interface driver (8) is determined to control the solid-state relay (7) to be closed/opened by combining dual judgment of impact acceleration threshold values and duration, and accurate output of impact discrete magnitude signals is achieved.

The dual-interface redundancy is specifically realized as follows: the impact data collected by one bus interface is processed and judged and then drives one discrete quantity to be output, a dual redundancy relation is formed between the impact data and the discrete quantity, and only two paths are effective, so that the impact data can be considered as an effective impact trigger signal.

The double-table block is specifically realized as follows: two acceleration sensors are connected to each bus interface, the processor collects data of the two acceleration sensors at each time to conduct voting judgment, the two data are used as effective judgment bases within a certain range, and failure of a single sensor can be reported.

Has the advantages that: the impact detection sensor adopts a mode of dual-interface redundancy and dual voting, and double judgment is carried out on the impact acceleration threshold and the duration, so that the reliability and the safety of a product are high; meanwhile, two key parameters of the impact acceleration threshold and the duration can be set through software, so that the product can adapt to the falling and collision working conditions of multiple machines.

Drawings

Fig. 1 is a schematic block diagram of an impact detection sensor.

Fig. 2 is an internal schematic block diagram of the shock detection processing module.

The system comprises a power module 1, an impact detection processing module 2, an MEMS acceleration sensor 3, a processor 4, an ADC5, a memory 6, a solid-state relay 7 and an interface driver 8.

Detailed Description

The impact detection sensor of the embodiment of the invention is composed of a power module 1 and an impact detection processing module 2, as shown in fig. 1. The design principle is as follows:

the power module mainly comprises a power input conditioning part, a filtering part (+ DC/DC) part, an energy storage part, a power conversion part and a control part, and mainly converts an input 28V direct-current power supply into 3.3V and 5V power supplies required by the acceleration detection processing module, provides certain energy storage and provides a standby power supply for the impact detection processing module.

The impact detection processing module mainly comprises a digital MEMS acceleration sensor, an HB6096 bus protocol device, an RS422 communication interface, a solid-state relay, NAND FLASH, an ARM processor and a related peripheral circuit, and achieves the functions of acquisition, judgment and storage of impact signals and digital output of the acceleration signals. The internal functional block diagram of the impact detection processing module is shown in fig. 2, wherein the MEMS sensor 1 and the MEMS sensor 2 are used for detecting an impact acceleration signal, and mainly implement the following functions:

the on-chip bus interface and the MEMS acceleration sensor interface are used for realizing the acquisition of triaxial impact acceleration data and voting judgment;

the receiving of 2-path HB6096 data and the sending of 1-path HB6096 data (mainly sending three-axis acceleration) can be realized through an on-chip bus interface and an HB6096 protocol driving device interface;

through an on-chip bus and NAND FLASH memory interface, the collected impact acceleration data and calibration data are stored, so that the data analysis is convenient to be carried out in the initial stage, the actual impact acceleration change condition on an analyzer is convenient, and the applicability of an impact judgment threshold value is determined;

the 1-path duplex RS422 interface is realized through the interface of the UART interface on the chip and an external RS422 driver, and can be used for product maintenance (detection, software upgrading and the like);

acquiring the working state of a product through an I/O interface;

and the relay is controlled to output discrete magnitude signals through the I/O interface.

Claims

1. An impact detection sensor based on an impact safety discrimination method comprises a power module (1) and an impact detection processing module (2), and is characterized in that the impact acceleration of three axial directions of an airplane is obtained by adopting a dual-interface redundancy and dual voting mode, and when the impact acceleration exceeds an acceleration threshold value and duration time specified by a protocol, discrete magnitude signals are output;

the impact detection processing module (2) comprises an MEMS acceleration sensor (3), a processor (4), an ADC (analog-to-digital converter) (5), a memory (6), a solid-state relay (7) and an interface driver (8), the impact detection processing module (2) controls an analog-to-digital converter to carry out digital quantization and filtering on an output signal of the MEMS acceleration sensor through the processor, so that the acquisition purpose of an impact signal is achieved, and meanwhile, the interface driver (8) is determined to control the solid-state relay (7) to be closed/opened by combining dual judgment of an impact acceleration threshold and duration, so that accurate output of an impact discrete magnitude signal is realized;

the dual-interface redundancy is specifically realized as follows: the impact data collected by one bus interface is processed and judged to drive one corresponding discrete quantity to be output, the impact data collected by the other bus interface is processed and judged to drive the other corresponding discrete quantity to be output, a dual redundancy relation is formed between the two, and only two paths of data are effective, the data can be considered as an effective impact trigger signal;

two acceleration sensors are connected to each bus interface, the processor collects data of the two acceleration sensors at each time to conduct voting judgment, the two data are used as effective judgment bases within a certain range, and failure of a single sensor can be reported.