Design of Toilet Pressure Control System Based on PLC for Train Carriages Implementation

The implementation of a control system for vacuum toilets in train carriages is essential to address the drawbacks associated with conventional toilets, including high water consumption and complex maintenance requirements. This research focuses on developing a design of PLC-based Control System for Vacuum Toilets, utilizing a pressure transmitter and a Programmable Logic Controller (PLC). The pressure transmitter, with a scale ranging from −1 to 0 Bar, generates a signal between 0.5 and 4.5 V. This signal is processed by the PLC, which analyzes the data and generates output signals for the actuator. The actuator, a solenoid valve, controls the flow of water, air, and waste by opening and closing accordingly. The target pressure value of −70 cmHg is maintained to ensure efficient operation of the vacuum toilets. By implementing this PLC-based control system, water conservation is enhanced, and the challenges associated with complex piping systems and excessive water consumption in conventional toilets are overcome. The system aims to improve sustainability, efficiency, and maintenance ease in train carriage sanitation.