On-board equipment on-off output channel online self-checking system of subway signal system

Abstract

The invention relates to an on-board equipment on-off output channel online self-checking system of a subway signal system. The system comprises an output channel, a feedback isolation power supply and a feedback isolation acquisition unit. The output channel comprises a control unit, a driving unit and an output contact. The control unit is connected with the driving unit and the feedback isolation acquisition unit respectively. The driving unit is connected with the output contact. The feedback isolation power supply and the feedback isolation acquisition unit are connected to the output contact respectively. When the output contact is switched on, the feedback isolation acquisition unit and the feedback isolation power supply form a closed circuit, and the feedback isolation acquisition unit collects current signals of the feedback isolation power supply, converts the current signals to form feedback signals and then sends the feedback signals to the control unit, so that whether the channel is normal is detected. The self-checking system can truly and accurately conduct self-checking on the on-off output channel, and if a self-checking circuit fails, the output channel will not be caused to fail, and an external load of the output channel can not be influenced.

Description

technical field [0001] The invention relates to the technical field of train control, in particular to an online self-inspection system for switching output channels of on-board equipment of a subway signal system. Background technique [0002] The safety and reliability requirements of the on-board equipment of the subway signal system are very high. The output unit of the on-board equipment undertakes the control output function of the entire system. Whether the output channel is normal. There are three common output channel inspection methods. Figure 1-3 A schematic structural diagram of three output channel detection schemes of the present invention is shown. refer to Figure 1-3 , the first is to use the same drive feedback method, a typical circuit such as a multi-contact relay. Vehicle-mounted equipment uses one contact of the relay as a switch output, and the other contact as a feedback signal for detection. When the relay coil acts, the two contacts act together...

AI Technical Summary

Problems solved by technology

However, the combination of the feedback circuit and the output channel will increase the failure rate of the output channel. When the feedback circuit fails, the output channel will also fail, resulting in a decrease in the availability of the output channel.

[0005] Using the third detection method can avoid the defects of the above two methods, but the circuit is complex, because the output contact is shared, the output signal and the feedback signal are generated at the same time, and the external load of the channel will inevitably be generated when the output channel needs to be self-tested. influences

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