Signal acquisition method and system based on safety input system

Abstract

The invention discloses a signal collecting method based on a safe input system and the system of the signal collecting method. In a rail transportation system, input signals are collected through an input circuit module and output to a processor module. As a plurality of input signal modules are arranged, in order to avoid aliasing of the signals, the return checking end of the input circuit module is used for comparing return checking signals and stimulus signals, the input signals and the stimulus signals generated by the processor module are superimposed to generate the return check signals, and whether the input signals are correct is judged. The input signals and the corresponding stimulus signals respectively have two code bits at least, each code bit at least has two code distances, aliasing of the signals of adjacent channels is avoided by increasing the code distances of the code bits, correctness of the collected signals is guaranteed, and mistaken collection of the signals is avoided. It is guaranteed that in the rail transportation system, the signals are accurately controlled and a train is normally scheduled when the train operates, and normal operation of the train is guaranteed.

Description

technical field [0001] The invention relates to a signal acquisition method and system based on a safety input system. Background technique [0002] Usually in the safety input system of rail transit, it generally adopts fixed level input acquisition or 1010 fixed dynamic pulse sequence acquisition, but these two acquisition methods have the following two defects. The defects of fixed level input acquisition are 1) when When the external environment generates interference, it is easy to affect the fixed level, resulting in incorrect collection of the system's level input; 2) When the external acquisition code bit circuit has a failure such as adhesion or short circuit, the system cannot monitor the failure in time, let alone timely Troubleshoot. Similarly, the disadvantages of using 1010 fixed dynamic pulse sequences are: 1) All code bits use the same pulse sequence, which is susceptible to interference from adjacent channels; 2) If the circuits of adjacent code bits are sh...

AI Technical Summary

Problems solved by technology

[0002] Usually in the safety input system of rail transit, it generally adopts fixed level input acquisition or 1010 fixed dynamic pulse sequence acquisition, but these two acquisition methods have the following two defects. The defects of fixed level input acquisition are 1) when When the external environment generates interference, it is easy to affect the fixed level, resulting in incorrect collection of the system's level input; 2) When the external acquisition code bit circuit has a failure such as adhesion or short circuit, the system cannot monitor the failure in time, let alone timely troubleshooting

Similarly, the disadvantages of using 1010 fixed dynamic pulse sequences are: 1) All code bits use the same pulse sequence, which is susceptible to interference from adjacent channels; 2) If the circuits of adjacent code bits are short-circuited or mixed , the same pulse sequence is collected at both code points, and the fault cannot be ruled out

Due to the above defects, when rail transit is running, the safety input system is mainly used to collect signal lamp information, train turnouts and other information, and control the running speed of trains and train scheduling by collecting these information. In the case of aliasing, it may cause errors in train control and scheduling, and in serious cases, it will cause major traffic accidents such as train rear-end collisions, which seriously threaten the safety of people's lives and property

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