Train Set Braking Control for Regenerative Current Limiting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current train braking systems in ZDS/ZMS mode cannot effectively limit the electrical feedback current of guided locomotives during regenerative braking, leading to potential overcurrent issues and requiring manual input of overcurrent limits by drivers, which is inefficient and labor-intensive.
Innovation Solution
A method and device that utilize a time multiplex train bus system to detect actual currents and braking requests, determining an electrical target braking value to limit the maximum electrical return current, ensuring the electrical supply network is not overloaded, and applying the missing braking force pneumatically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If regenerative braking is used to maximize electrical feedback current, then energy recovery is improved, but the electrical supply network may be overloaded
Solution Approach 1:
The system continuously monitors the actual electrical operating current of both the guided and guiding locomotives, and uses this feedback to dynamically adjust the electrical target braking value. The control device determines the electrical braking force based on the difference between the pneumatic braking request and the actual current, ensuring that the maximum return current value is not exceeded while maximizing energy recovery through regenerative braking.
2Adaptability or versatility
If manual input of overcurrent limit values is required for each guided locomotive, then individual overcurrent regulation is possible, but driver workload and complexity increase
Solution Approach 1:
The system automatically determines the electrical target braking value for each guided locomotive based on the maximum return current value input by the driver and the actual operating conditions. The control device performs calculations and adjustments without requiring the driver to manually configure individual limits for each locomotive, enabling adaptive regulation while minimizing operational complexity.
3Object-affected harmful factors
If electrical braking force is increased to limit feedback current, then network overload is prevented, but pneumatic braking must compensate for the reduced braking force
Solution Approach 1:
The system dynamically adjusts the electrical target braking value based on real-time conditions including the actual electrical operating currents and the maximum return current value. The control device continuously optimizes the balance between electrical and pneumatic braking, increasing electrical braking when it can limit feedback current effectively, and activating pneumatic braking only when necessary to compensate for reduced electrical braking force.
Data Source
AI summary
A method for braking a train set having guiding and guided locomotives interconnected by a time multiplex train bus, includes detecting actual operating current of the guided locomotive, detecting actual operating current of the guiding locomotive, detecting maximum return current, detecting pneumatic braking request of compressed air brake line, determining maximum return current and target braking of the guided locomotive from actual operating current of the guided locomotive, actual operating current of the guiding locomotive, maximum operating current and pneumatic braking request of the brake line, and electrically braking the train set using electrical target braking, while not exceeding maximum return current of the guided locomotive. The maximum current fed back by the guided locomotive is known, and the guided locomotive controlled through the main air line is braked while not exceeding the maximum return current. The braking force is divided by blending among E and pneumatic brakes.