Pulse calibration system and method in a train control system

Abstract

The embodiment of the invention provides a pulse calibration system and method in a train control system; the calibration system comprises a pulse output module, a pulse conditioning module, a transmission module, a signal receiving end, and a calibration module and a control module in communication connection; the calibration module and the signal receiving end are in communication connection; the control module is connected with the pulse output module; the calibration module is used for obtaining a ratio value between a pulse emission preset period and a real period, and a ratio value between a preset pulse duty ratio and a real pulse duty ratio; the control module is used for calibrating the pulse emission preset period and the pulse emission preset pulse duty ratio according to the obtained ratio values. The pulse calibration system can dynamically adjust the pulse output period and duty ratio in the train control system in real time, thus enabling the signal receiving end to receive correct pulse signals when the pulse signals are transmitted in a long distance by the signal conditioning circuit or even under fault conditions.

Description

technical field [0001] The invention relates to the technical field of train control systems, in particular to a pulse calibration system and method in the train control system. Background technique [0002] Because of its unique anti-interference technology, the pulse control method can ensure stable and reliable work in the harshest industrial environment, and can completely replace the PLC control to realize the dust removal control of large dust collectors; therefore, the pulse control method is applied to various In this field of control, especially in the multi-master train control system. [0003] At present, the basic structure of using periodic pulses to realize multi-master synchronization or using PWM pulses to realize servo control is as follows: figure 1 As shown, the functions of each functional module are as follows: [0004] 1) The CPU function module sets the period and duty cycle of the periodic pulse through counters, timers, etc.; [0005] 2) The pulse...

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Problems solved by technology

[0010] However, in the above-mentioned pulse control method, since the pulse generation in pure digital electronics depends on the CPU, if the accuracy of the external clock of the CPU deteriorates and the error increases, the timing information of the CPU is also based on the external crystal oscillator, so that The CPU cannot calibrate this error, and the above-mentioned pulse control method has high requirements for the clock accuracy of the feedback counting function module, and the higher the feedback accuracy requirement, the higher the clock frequency of the counting module. Therefore, the above-mentioned pulse control method is not suitable for the train control system

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