Magnetic Track Brake Control Circuit With Delay and Fault Feedback
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Solution Overview
Problem
Conventional magnetic track braking systems for rail transit vehicles are not compatible with DC110V power supply systems, lacking delay control and advanced features like automatic power-off, status monitoring, and fault feedback, which are necessary for newer medium and high-speed urban rail vehicles.
Innovation Solution
A logic control system for magnetic track braking that includes a control circuit with a pneumatic actuator relay, electromagnet relay, system protection relay, power-on and power-off delay relays, and a status monitoring and feedback circuit, enabling automatic and manual control, time-sharing control of the actuator and electromagnet, and automatic power-off to prevent damage, as well as real-time monitoring and fault detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If DC24V power supply system is used for magnetic track braking control, then the system can be controlled using a simple contactor, but it is not compatible with DC110V power supply systems of new medium and high-speed urban rail vehicles and lacks delay control capability
Solution Approach 1:
The patent introduces a power supply voltage conversion mechanism that transforms the control circuit to work with DC110V power supply systems. This includes using voltage conversion circuits and control modules that can process DC110V input and generate appropriate control signals for the magnetic track braking system, thereby achieving compatibility with new medium and high-speed urban rail vehicles while maintaining controlled complexity through modular design
Solution Approach 2:
The patent implements delay control relays that are activated in advance before the magnetic track braking operation. These relays pre-position the control signals and ensure proper sequencing of the braking actuator and electromagnet activation, providing the necessary delay control capability that was missing in the DC24V system while integrating seamlessly with the DC110V power supply
2Reliability
If the electromagnet operates continuously without automatic power-off, then the braking function is maintained, but the electromagnet may be damaged due to extensive operating time
Solution Approach 1:
The patent incorporates a time monitoring mechanism that tracks the operating duration of the electromagnet. When the electromagnet reaches a predetermined operating time threshold, the system automatically issues a power-off signal to prevent overheating and damage. This feedback-based time management protects the electromagnet while maintaining simple braking control through automatic decision-making logic
Solution Approach 2:
The patent implements periodic operation cycles for the electromagnet, where the braking function is activated only for necessary time intervals. The control system monitors each braking event duration and enforces periodic on-off cycles, preventing continuous operation that could lead to damage. This periodic action pattern maintains braking effectiveness while protecting the electromagnet through automatic time-based control
3Reliability
If the magnetic track braking system lacks status monitoring and fault feedback, then the system structure remains simple, but it cannot provide automatic power-off after extensive operating time or fault detection
Solution Approach 1:
The patent introduces comprehensive feedback circuits that continuously monitor the status of the magnetic track braking system components. These feedback mechanisms detect operating parameters, identify fault conditions, and provide real-time information to the control module. The feedback signals enable automatic power-off decisions and fault detection without requiring complex external monitoring systems, achieving enhanced reliability through integrated feedback loops
Solution Approach 2:
The patent designs the control circuit to perform multiple functions simultaneously: power supply conversion, delay control, time monitoring, status monitoring, fault detection, and automatic power-off control. By integrating these diverse functions into a unified control module, the system achieves comprehensive monitoring and protection capabilities while minimizing the increase in overall circuit complexity through functional integration
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
The system provides safe and reliable control of magnetic track braking for medium and high-speed urban rail vehicles, enabling efficient operation and fault management, compatible with DC110V power supply systems and supporting advanced features like automatic power-off and status monitoring.
Implementation Method 1
a pneumatic actuator is controlled by a pneumatic actuator control device to drive the structural support of the cylinder up and down
Implementation Method 2
a magnetic track is excited, and then generates an electromagnetic attraction force with a guide rail to produce friction
Implementation Method 3
generates an electromagnetic attraction force with a guide rail to produce friction, the magnetic track braking actuator drops to a set position
Data Source
AI summary
A logic control system for magnetic track braking of a rail transit vehicle includes a magnetic track braking control circuit, a magnetic track braking power supply execution circuit, and a magnetic track braking status monitoring and feedback circuit. The magnetic track braking control circuit includes a pneumatic actuator relay, an electromagnet relay, a system protection relay, a power-on delay relay, a power-off delay relay, an automatic control branch circuit, and a manual control branch circuit. The pneumatic actuator relay is connected to the power-on delay relay, and the system protection relay is connected to the power-off delay relay. The automatic control branch circuit includes a first isolation magnetic track braking switch and an emergency braking relay contact. The manual control branch circuit includes a first circuit breaker, a cab signal option switch, a second isolation magnetic track braking switch and a manual touch button.