Safety Drive Relay Control for Electromagnetic Induction Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional gravitation type relays in railway signal systems experience electromagnetic induction when driven by redundant safety drive units, leading to abnormal port states and potential safety issues.
Innovation Solution
A processing method that detects the port state of an output port when a drive command changes, and only performs external driving operations after the port state is normal, ensuring safe operation by guiding the system to a safety side method if the port state is abnormal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If two safety drive units drive the relay at the same time to improve response speed, then the response speed is improved, but the port state is detected to be abnormal due to electromagnetic induction
Solution Approach 1:
The patent applies preliminary action by detecting the port state before executing the drive command. When a drive command changes, the system first detects whether the port state is normal (not in electromagnetic induction state). Only if the port state is normal does the system proceed with the drive operation. This preliminary detection prevents simultaneous driving caused by electromagnetic induction, resolving the contradiction between fast response and reliable port state detection.
2Speed
If the safety drive unit performs external driving operations immediately upon receiving a drive command, then the response speed is improved, but electromagnetic induction occurs when main system and standby system co-drive the relay
Solution Approach 1:
The patent converts the harmful electromagnetic induction effect into a detectable signal. By monitoring the port state, the system detects when electromagnetic induction occurs (abnormal state). This detection mechanism transforms the harmful phenomenon into useful information that triggers the system to wait before driving, preventing simultaneous co-driving. The harmful electromagnetic induction is thus converted into a protective feedback signal.
Solution Approach 2:
The patent implements feedback by continuously monitoring the port state and using this information to control subsequent drive operations. When the port state is detected as abnormal (indicating electromagnetic induction), the system waits for the next cycle before executing drive commands. This feedback loop prevents the harmful effect of simultaneous co-driving while maintaining fast response when conditions are normal.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents electromagnetic induction and ensures safe driving by only performing external driving operations when the port state is normal, thereby avoiding abnormal detection results and improving overall system safety.
Implementation Method 1
after the armature is energized, the conducted 24 V DC causes the iron core to generate an induced electromotive force
Data Source
AI summary
A processing method for preventing electromagnetic induction when a main system and a standby system of a safety drive unit co-drive a relay. The method includes the following steps: periodically acquiring and detecting a drive command; detecting a port state of an output port of a safety drive unit when the drive command changes; performing a corresponding processing operation according to the port state of the output port; and repeating the foregoing steps.