Method of Switching Output Signals of Dual Redundancy Avionics Equipment

Abstract

The invention discloses a method for switching output signals of a dual-redundancy avionics device, aiming to provide a redundancy switching with reliable logic and strong anti-interference ability. The present invention is realized through the following technical solutions: the dual-redundancy avionics device presets a certain redundancy logic sequence for determining master control rights for the local machine and other machines according to the results of power-on and periodic self-inspection; Interact with each redundancy state value of other machines, and then switch the two state values ​​of the above machine and other machines to make logical judgments, and perform XOR operations on the local machine state output signal and other machine state input signals in this machine Generate a state change signal, determine the rising edge of the state change signal to control the main control signal of this machine or other machines, and use the judgment result of the XOR logic operation as the basis for the normal or abnormal working status of each redundancy of this machine and other machines. Determine the master control rights of this machine and other machines, and the local machine or other machines that have obtained the master control redundancy can realize effective output by controlling the master control signal.

Description

technical field [0001] The invention relates to a method for switching output signals applied to dual redundancy avionics equipment. More specifically, the present invention is directed to a method of switching output signals for a dual redundant electronic device. Background technique [0002] Modern dual-redundancy avionics; LN-125 inertial navigation system / global positioning system, which can improve target positioning accuracy; heavy fuel engine. Redundancy is a design method that requires two or more faults, rather than a single fault, to cause a predetermined undesired working state. In short, redundancy is a design method that is considered to ensure safety , this design method is mostly used in the adjustment and control of airborne equipment. Two or more components, subsystems or channels can be used for redundancy. It is applied to aircraft avionics systems with two or more components, subsystems System or channel equipment can be called dual redundant avionics ...

AI Technical Summary

Problems solved by technology

This switching method has the following disadvantages: First, the direct interaction of the state and the main control signal will easily cause the signal to be interfered by space electromagnetic coupling, causing abnormal changes in the state and the main control signal, which will affect the logic operation results of the redundancy switching, resulting in the effective operation of the equipment. The output is chaotic; the second is to designate a certain redundancy as the main control redundancy to reduce the possible ways of logic switching and reduce the utilization rate of equipment. The third is to use electromagnetic relays to control the output, which takes a long time to switch contacts and strong electromagnetic noise Causes output signal jitter, and the number of contact movements is limited, and the reliability of the device is low

However, the state output signal of this machine is interfered by space electromagnetic coupling during transmission to other machines, causing the state output signal of this machine to become low level instantaneously (called the disturbed local state output signal), and the other machine receives the received state output signal. After interfering with the state output signal of this machine, it is considered that the machine is faulty, and other machines will obtain the master control right; at this time, the machine always sets the state signal of the machine as valid, and does not release the master control right, so the master control signals of this machine and other machines appear Simultaneously effective state, that is, the wrong logic of the main control of the local machine and other machines at the same time, resulting in confusion in the output signal of the dual-redundancy avionics equipment

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