Optical Sensor Drain Control for Diesel Fuel Filter Water Separation
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Solution Overview
Problem
Existing drain control devices for filter systems, particularly in fuel supply systems, face challenges in reliably separating and draining water from diesel fuel, often resulting in mixed discharges or incomplete drainage.
Innovation Solution
A sensor arrangement with at least one optical sensor unit coupled with a shut-off valve is used to automatically drain water from a collecting chamber when a predetermined criterion is reached, ensuring that water is separated and discharged without mixing with diesel fuel, utilizing different action mechanisms for enhanced reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a float valve with solenoid valve is used for automatic drainage, then the drainage function is automated, but the reliability of pure second medium discharge cannot be ensured
Solution Approach 1:
The patent replaces the mechanical float valve system with an optical sensor-based detection system. The optical sensor detects the presence of the second medium (water) by measuring light transmission properties, enabling automated drainage control without mechanical moving parts. This substitution improves reliability by providing precise detection of the drainage state.
Solution Approach 2:
The patent implements a feedback control system where the optical sensor continuously monitors the collecting chamber for the presence of the second medium. When water is detected, the system activates the drainage pump, and continues monitoring until the water is completely drained, ensuring pure first medium (fuel) discharge. This closed-loop feedback ensures reliable operation.
2Duration of action of stationary object
If drainage is performed for long service lives, then the filter system operates extended periods, but mixed discharge of first and second medium occurs
Solution Approach 1:
The patent uses optical sensors to detect the second medium (water) based on its light transmission properties, which differ from the first medium (fuel). This non-contact detection method provides reliable identification of water presence throughout the service life, preventing mixed discharge even during extended operation periods.
Solution Approach 2:
The continuous optical monitoring provides real-time feedback on the drainage status, allowing the system to operate for extended periods while ensuring pure fuel discharge. The system can detect and respond to water accumulation at any point during the service life, maintaining discharge purity throughout extended operation.
3Measurement precision
If optical sensor is used to detect radiation intensity, then water detection precision is improved, but device complexity increases
Solution Approach 1:
The patent employs optical sensors that detect water based on light transmission properties. This method provides high measurement precision for water detection without requiring complex mechanical or chemical systems. The optical detection leverages the natural difference in light transmission between water and fuel.
Solution Approach 2:
The optical sensor system serves multiple functions: detecting water presence, monitoring drainage progress, and verifying complete drainage. This multi-functionality achieves high detection precision without proportionally increasing device complexity, as a single sensor type performs multiple detection tasks.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves safe and reliable operation by ensuring that at least 90% of the water is drained without mixing with diesel fuel, using optical sensors to detect light intensity differences and other sensors to confirm the presence of water, thereby preventing mixed discharges.
Implementation Method 1
the optical sensor can detect a radiation intensity, in particular light intensity, which penetrates the medium contained in the collecting chamber
Data Source
AI summary
A drain control device for a filter system for filtering a media flow of a first medium and a second medium, wherein the filter system has a collecting chamber collecting the second medium separated from the media flow and provided with a media outlet, has a sensor arrangement with at least a first sensor unit. The first sensor unit detects a filling level of the second medium in the collecting chamber. The first sensor unit has a first optical sensor. One or more shut-off valves are arranged at the media outlet. The first sensor unit is coupled with the one or more shut-off valves to automatically drain the second medium from the collecting chamber through the media outlet when a predetermined filling level of the second medium in the collecting chamber is reached. A filter system with such a drain control device is provided.