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A Self-testing Method of Discrete Output Interface

An output interface, discrete technology, applied in the field of avionics, can solve the problems of failure to respond in time, the loop is too long, the control is cumbersome, etc., to achieve the effect of stable detection results, short loop, and fast response

Active Publication Date: 2021-02-09
SHAANXI QIANSHAN AVIONICS
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  • Description
  • Claims
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Problems solved by technology

[0003] The purpose of the present invention is to provide a self-testing method for a discrete output interface, which is suitable for the self-testing of the discrete output interface in the electromechanical system in the aviation field, so as to solve the problem that the loop is too long and the control is cumbersome in the traditional self-testing method. Timely response to technical issues

Method used

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  • A Self-testing Method of Discrete Output Interface
  • A Self-testing Method of Discrete Output Interface
  • A Self-testing Method of Discrete Output Interface

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Embodiment Construction

[0028] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0029] Refer below Figure 1 to Figure 3 , to further describe in detail the discrete output interface self-testing method of the present invention.

[0030] In this embodiment, the input voltage is the voltage on the machine, which is 28V, and the injected negative voltage is -15V. According to the selected input voltage, the value of K1 is set to (±5.6V) by experience, and the value of K2 is (±5.6V). 3V), the value of K3 is (±0.3V), AS shown in the figure is the first collection point, and BS is the second collection point. Specific steps are as follows:

[0031] Power-on self-test: if figure 1 As shown, take the self-test method schematic diagram of the 28V / on type discrete output interface as an example.

[0032] Step 1: Control optocoupler switch A to close and optocoupler switch B to open, such as figure 2 . Use the traditional method of collecti...

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Abstract

The invention belongs to avionics technology, and specifically relates to a self-testing method of a discrete output interface; the method of the present invention isolates and segments the circuit to be tested by adding an auxiliary switch, and performs segmental detection, including power-on self-test first and cycle Self-inspection: according to the voltage value of different collection points after subsection and the input voltage, and the negative voltage injected, judge the normal on-off working state in the circuit; the self-inspection circuit of the present invention provides a discrete output interface The self-testing circuit realizes the self-testing function of rapid detection and quick response of discrete output interface faults with low cost and high stability.

Description

technical field [0001] The invention belongs to the avionics technology, and in particular relates to a self-testing method of a discrete quantity output interface. Background technique [0002] In the field of avionics technology, the discrete output interface is a particularly important interface. For example, the discrete signal (switch signal) output by the discrete output interface can indirectly or directly control the opening and closing of the fuel pump. The fuel pump cannot work normally due to the failure of the volume output interface. If the alarm is not detected in time and corresponding measures are not implemented, serious consequences will definitely result. In order to ensure the correctness, stability and detectability of the output of the discrete output interface, the respective detection methods are derived for the specific discrete output interface circuit. The traditional self-test method is to compare the output command and the output electrical signa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 徐闻拯田军王君阳
Owner SHAANXI QIANSHAN AVIONICS
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