Single-Door Control Circuit for Trains Using Sleep and Wake States
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Solution Overview
Problem
Conventional single-door control circuits for trams and driverless trains are complex and costly, with high failure rates due to purely mechanical structures and time delay circuits, which compromise the service life of mechanical devices.
Innovation Solution
A single-door control circuit with a door control unit, a single-door button in the cab, and an electric unlocking switch outside, featuring a first circuit for sleep states and a second circuit for wake-up states, utilizing relays and signal ports to manage door opening and closing efficiently, reducing power consumption and centralized control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a purely mechanical unlocking device with wire rope is used, then the door can be unlocked, but the mechanical device service life is reduced and manual opening is required
Solution Approach 1:
The patent replaces the purely mechanical wire rope unlocking system with an electric unlocking switch and control circuit. The electric unlocking switch activates an unlocking motor through a control unit, which drives the door unlocking mechanism. This substitution eliminates the need for manual pulling through wire rope, extends mechanical component service life by reducing mechanical wear, and provides more reliable door unlocking operation.
2Reliability
If a complex time delay and holding circuit with relay and contactor is designed, then single-door unlock control is achieved, but circuit design cost and failure rate increase
Solution Approach 1:
The patent extracts and eliminates unnecessary complex circuit components such as time delay circuits, holding circuits, and multiple relays from the control system. The control unit directly responds to the electric unlocking switch signal and executes door unlocking without requiring complex intermediate control circuits. This simplification reduces circuit design cost, lowers failure rate, and maintains reliable single-door unlock control functionality.
3Adaptability or versatility
If multiple relays and contactors are added to the control circuit, then door control functionality is expanded, but circuit design cost and failure rate increase
Solution Approach 1:
The patent implements a universal control unit that can handle multiple door control functions through software control rather than dedicated hardware circuits for each function. The control unit processes signals from the electric unlocking switch, manages door opening/closing operations, and coordinates with the unlocking motor and door drive mechanism through a unified control architecture. This multi-functional approach expands door control capabilities while minimizing circuit complexity and component count.
Data Source
AI summary
A single-door control circuit for a train includes a first circuit for controlling a single door when the train is in a sleep state, and a second circuit for controlling a door of the train when the train is in a wake-up activated state. When the train is in the sleep state, the second circuit is not electrified, the first circuit works, a door control unit is electrified by a storage battery power supply, and the single-door control is triggered by an electric unlocking switch or a single-door button; and when the train is in the wake-up activated state, the first circuit is cut off, the second circuit is electrified, and under a condition that a cab on a local side is activated and the train is at a zero velocity, the single-door control is only triggered by activating the single-door button in the cab.