Electro-pneumatic Valve Closed-loop Pressure Control
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Solution Overview
Problem
Conventional electro-pneumatic valves operate in an open-loop manner, leading to significant delays in detecting malfunctions, which can be critical in safety applications like braking systems, where timely correction of pressure issues is essential.
Innovation Solution
An electro-pneumatic device with a sensor portion and a valve portion that uses multiple frequencies for electronic control signals, where the sensor senses delivery pressure and transmits data signals, enabling direct feedback to the controller for immediate correction of pressure discrepancies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional open-loop control is used, then device complexity is reduced, but response time deteriorates due to detection delays
Solution Approach 1:
The patent implements a closed-loop control system where the sensor continuously monitors delivery pressure and feeds back real-time data to the controller. This feedback mechanism enables the controller to detect pressure deviations immediately and adjust valve operation accordingly, eliminating the detection delays inherent in open-loop systems while maintaining manageable system complexity through integrated sensor-valve-controller architecture.
Solution Approach 2:
The patent replaces mechanical pressure indication methods with electronic sensing and signal transmission. The sensor portion converts pressure information into electronic data signals that are transmitted to the controller, substituting mechanical feedback paths with electronic ones to achieve faster response times without proportionally increasing overall system complexity.
2Measurement precision
If multiple frequencies are used for control signals, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent employs periodic control signals at different frequencies to interrogate the sensor and actuate the valve. By using frequency-multiplexed signals, the system can distinguish between sensor readings and valve control commands, improving measurement precision through frequency-based signal separation while managing complexity through regular periodic patterns that simplify signal processing logic.
Solution Approach 2:
The control signal serves multiple functions simultaneously: it powers the sensor, provides clock signals for data transmission, actuates the valve, and enables pressure measurement. This multi-functionality is achieved through frequency division where different frequency components of the same signal train serve different purposes, improving measurement precision without requiring separate dedicated circuits for each function.
Data Source
AI summary
An electro-pneumatic device includes a sensor portion and a valve portion. The sensor portion, which includes a sensor, receives and transmits electronic control signals of a plurality of frequencies. The sensor portion is powered by a first of the frequencies of the received control signals. The valve portion electrically communicates with the sensor. The valve portion includes a valve that is alternately set to an open state and a closed state based on a second of the plurality of frequencies of the received control signals. The sensor senses a delivery pressure of the valve and transmits electronic data signals representing the delivery pressure at a third of the plurality of frequencies.