Variable Gauge Train Control Device Torque Management
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Solution Overview
Problem
In variable gauge train control systems, the collective control system experiences a significant drop in driving force when wheels undergo gauge changeover due to idling control restricting torques of main electric motors, leading to reduced performance.
Innovation Solution
A variable gauge train control device with an inverter system that includes a location detector, idling detector, torque calculator, and idling control switcher to suspend idling control during gauge changeover, allowing the inverter to maintain normal torque patterns and prevent torque restriction of main electric motors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a collective control system with a single inverter is used to control all main electric motors, then the number of inverters and controllers is reduced (decreasing device complexity, size, weight, and cost), but the driving force of the entire train significantly drops when some wheels undergo gauge changeover due to torque restriction
Solution Approach 1:
The patent segments the torque control by creating two distinct torque patterns: a first torque pattern for normal operation and a second torque pattern for gauge changeover operations. The idling control switcher selectively applies the appropriate torque pattern based on detection signals, allowing the collective control system to maintain full driving force during gauge changeover by switching to the first torque pattern when idling is detected, thus resolving the contradiction between system simplicity and power maintenance
Solution Approach 2:
The patent introduces dynamic switching capability to the collective control system through the idling control switcher, which dynamically selects between two torque patterns based on real-time detection of gauge changeover conditions. This dynamic adaptation allows the system to maintain optimal performance (full driving force) during gauge changeover while preserving the benefits of collective control, effectively resolving the static limitation of the collective control system
2Reliability
If idling control is performed to restrict torques of main electric motors when wheels run idle during gauge changeover, then the idling state of wheels is controlled, but the driving force of the entire train significantly drops
Solution Approach 1:
The patent introduces an intermediary mechanism (the idling control switcher and torque calculator) that mediates between the idling control function and the torque delivery to the main electric motors. When gauge changeover is detected, the switcher blocks the idling detection information, preventing the torque restriction that would otherwise occur. This intermediary approach allows the system to maintain full driving force during gauge changeover while still preserving the idling control capability for normal operations
Data Source
AI summary
A variable gauge train control device comprises an inverter, a location detector, and a torque calculator. The inverter collectively controls torques of main electric motors. The location detector detects an entry into a gauge changeover section. The torque calculator, upon detection by the location detector of the entry into the gauge changeover section, suspends idling control that otherwise restricts the torques of the main electric motors and calculates a first torque pattern for making the inverter operate in accordance with the torques of the main electric motors.