Tank Ventilation Bypass Sensor for Hydrocarbon Measurement
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Solution Overview
Problem
Internal combustion engines face challenges in accurately ventilating fuel tanks and managing pollutant emissions, particularly due to the release of volatile hydrocarbons which can lead to inefficient combustion and increased emissions.
Innovation Solution
A tank ventilation system with a purge line featuring a bypass and a sensor to measure hydrocarbon concentration, allowing for precise control of fuel dosing and emission reduction, utilizing a U-shaped bypass for laminar flow and a valve for reliable ventilation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor is placed directly in the purge line to measure hydrocarbon concentration, then measurement accuracy is improved, but the sensor is exposed to particles and turbulence that can damage it or affect measurement reliability
Solution Approach 1:
The purge line is segmented into a main line and a bypass line. The sensor is placed in the bypass line where flow conditions are more favorable, separating the measurement function from the harsh conditions of the main purge line while still allowing measurement of the same fluid stream.
Solution Approach 2:
The bypass line acts as an intermediary pathway that allows the sensor to indirectly measure hydrocarbon concentration in the purge line without being directly exposed to the turbulent, particle-laden flow conditions of the main purge line.
2Measurement precision
If the purge line flow is turbulent to ensure thorough mixing, then hydrocarbon concentration measurement is improved, but particle damage to the sensor increases
Solution Approach 1:
The flow path is segmented into a main purge line and a bypass line. The bypass provides a separate measurement pathway with reduced turbulence and particle exposure, while the main line continues to handle the bulk flow with adequate mixing.
Solution Approach 2:
Different flow conditions are created in different parts of the system: the main purge line maintains sufficient turbulence for mixing, while the bypass line provides laminar, particle-free flow conditions suitable for sensor placement and accurate measurement.
3Reliability
If the tank ventilation system vents all hydrocarbons to prevent buildup, then safety is improved, but pollutant emissions increase
Solution Approach 1:
The sensor provides continuous feedback on hydrocarbon concentration in the purge line. This information is used to control the ventilation system, allowing it to vent when concentrations are high (safety) and reduce or stop venting when concentrations are low (emission reduction), optimizing both safety and environmental performance.
Solution Approach 2:
The ventilation system dynamically adjusts its operation based on measured hydrocarbon concentration parameters. Instead of continuous full-scale venting, the system modulates venting based on actual concentration levels, reducing unnecessary emissions while maintaining safety margins.
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 system enables accurate determination and reduction of pollutant emissions by metering hydrocarbons into the engine's intake system, optimizing the air/fuel ratio and reducing the risk of sensor damage through effective particle exclusion.
Implementation Method 1
A sensor arranged in the bypass of the purge line and designed to determine the concentration of hydrocarbons in a fluid in the purge line
Implementation Method 2
the bypass of the purge line is of U-shaped design. This makes possible laminar flow of the fluid in a zone around the sensor
Data Source
AI summary
A tank ventilation system includes a flushing line, off which a bypass branches and into which the bypass opens out. A sensor is arranged in the flushing line bypass to determine a concentration of hydrocarbons in a fluid in the flushing line. A hydrocarbon tank is coupled via a first connector to a first end of the flushing line and designed for coupling, via a second coupling, to a tank.