Fuel Quality Monitoring via Density-Sound Ratio
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Solution Overview
Problem
Existing fuel quality control systems fail to detect dangerous water contamination in fuel storage tanks containing alcohol-based fuels, as the density changes with water concentration, leading to undetectable contamination states that can damage vehicles.
Innovation Solution
A method involving continuous density measurements in the sump area of the storage tank using a magnetostrictive density measuring device, comparing measured values with specified density values characterizing the mixed phase of water and alcohol, accounting for temperature dependence, to assess fuel quality and detect water contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If density measurement is used to detect water contamination in conventional petrol, then water detection is enabled, but detection fails in alcohol-containing fuels due to density changes with water concentration
Solution Approach 1:
The patent changes the measurement parameter from simple density to the ratio of density to speed of sound. This ratio parameter remains effective for detecting water contamination in alcohol-containing fuels because while both density and speed of sound change with water concentration, their ratio provides a reliable indicator of contamination that overcomes the limitations of density measurement alone.
Solution Approach 2:
The patent introduces speed of sound measurement as an intermediary parameter. By measuring both density and speed of sound and using their ratio, the system creates an intermediate measurement approach that indirectly detects water contamination without being directly affected by the complex density changes that occur in alcohol-containing fuels.
2Ease of operation
If conventional density measurement systems are used, then water detection works for hydrocarbon fuels, but the system cannot distinguish contamination states in alcohol-containing fuels
Solution Approach 1:
The patent transforms the measurement approach by changing from a single parameter (density) to a composite parameter (density to speed of sound ratio). This parameter transformation preserves the ease of operation while recovering the lost contamination state information, as the ratio provides distinct values for different contamination levels that single-parameter density measurement cannot provide.
3Measurement precision
If density measurement is performed in the sump area, then contamination detection is enabled, but temperature dependence affects measurement accuracy
Solution Approach 1:
The patent changes from measuring density alone to measuring the ratio of density to speed of sound. This parameter transformation compensates for temperature dependence because both density and speed of sound are temperature-dependent, and their ratio tends to cancel out the temperature effects, providing a more stable measurement for contamination detection.
Solution Approach 2:
The patent implements a measurement system that continuously monitors both density and speed of sound and uses their ratio as feedback to detect contamination. This feedback mechanism allows the system to distinguish between temperature-induced density changes and contamination-induced density changes, as they affect the ratio differently.
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
Enables accurate detection of water contamination in alcohol-containing fuels, preventing vehicle damage by providing a comprehensive characterization of fuel properties and generating a warning signal when contamination exceeds predetermined limits.
Implementation Method 1
density measurement in the sump area of the storage tank is performed using a magnetostrictive density measuring device
Implementation Method 2
With capacitive sensors, the difference in the dielectric constant is used
Implementation Method 3
with ultrasonic sensors the speed of sound
Data Source
Figure 1
Figure 2
AI summary
The method involves measuring the density of fluid contained in a marsh area (8) of a storage tank (1). The measured density is compared with a predetermined value. The density of a mixed phase containing water and alcohol is characterized as a function of the composition. The composition of the alcohol-containing fuel above the marsh area is estimated from the comparison between the measured densities of the liquid in the bottom area with the given values.