Signal execution unit of computer interlock system and working method thereof

Abstract

The invention discloses a signal execution unit of a computer interlocking system and a working method thereof. The execution unit comprises a signal lamp control unit, a protective unit and a signal acquisition unit, wherein the protective unit comprises a logic protective unit and a signal safety relay; the logic protective unit receives first signal state information and second signal state information which is output by a first signal controller and a second controller respectively and represents the working state of each signal lamp control unit; the first and second signal controllers and the logic protective unit receive system feedback information acquired by the signal acquisition unit; the logic protective unit performs logical comparison on the first and second signal state information and the system feedback information through hardware, and outputs a signal lamp abnormal signal for controlling the signal safety relay according to a comparison result; and under the condition that the signal lamp abnormal signal is output, only the signal lamp abnormal signal is used for controlling the signal safety relay to ensure that the signal execution unit finishes fault oriented safety.

Description

technical field [0001] The invention relates to a station interlocking control system, in particular to a signal execution unit for controlling signal lamps and a working method thereof. Background technique [0002] The signal execution unit of station interlocking equipment is used to control various signal lights to perform corresponding actions. The coordinated use of different color light signals can provide various calibration indication information. Therefore, the correct lighting of each signal light is of great importance to railway safety. effect. [0003] In practical applications, if the signal lights display disorderly, the signal execution unit needs to perform fail-safe safety. Among them, the disorderly display phenomenon also includes the occurrence of "hostile signals" in the signal execution unit, for example, for the shunting signal In other words, a white light signal appears when a blue light signal is turned on, or two colored lights are turned on at ...

AI Technical Summary

Problems solved by technology

[0005] First of all, the above-mentioned fail-safe unit is composed of a dynamic circuit, and its function is to convert the pulse output by the CPU processing unit A and B into a stable voltage for controlling the switch in the normally closed state. CPU processing units A and B, if the CPU processing unit A and / or B break down, such as the program is out of control, then this kind of control device will not be able to complete the fail-oriented safety, which is a fatal problem for the railway system; in addition, the CPU processing The unit needs to perform error avoidance and fault tolerance processing on various command signals and detection signals according to the preset algorithm, and then output the pulse signal acting on the fail-safe unit according to the analysis results on the software. The response time of this process is 3 to 5 clocks The defect of this processing method is that it increases the probability of fault-oriented safety failure, and the delay time of fault judgment through software is longer than that of direct hardware logic operation (the response time of hardware is different even if different devices are different. at the nanosecond level), therefore, safety guidance cannot be performed in time, which is a very serious problem for railway control systems;

[0006] Secondly, the switch that is in the normally closed state is connected to the allowable circuit that controls each signal light. When a problem occurs in the system, CPU processing units A and B need to disconnect all the switches that are in the normally closed state, which undoubtedly increases. The possibility of abnormalities in the system

Therefore, the signal controller of this kind of structure cannot meet the requirements of controlling railway signal lights;

[0007] Again, each detection unit directly transmits the collected signal to CPU processing units A and B, which cannot achieve reliable measurement of the signal;

[0008] In addition, in practical applications, the time for outputting the prohibition signal is longer than the time for outputting the permission signal. Therefore, the switch whose output is on the prohibition circuit is often in an energized state, which will greatly affect the service life of the switch;

[0009] Finally, in order to realize the isolation of the control circuit and the monitoring circuit, the system state obtained by the monitoring machine through the CPU processing unit C is limited to the information collected by the state monitoring unit, but it cannot be known to the CPU processing units A and B responsible for executing actions The state of the system is monitored, which undoubtedly reduces the monitoring capability of the monitoring machine and affects the monitoring function of the monitoring machine

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