Exhaust Guide Vane for Sensor Flow Velocity
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Solution Overview
Problem
Existing exhaust systems for internal combustion engines face challenges in providing accurate and reliable measurements of exhaust gas composition due to insufficient flow velocities around sensors, leading to increased back pressure and reduced measurement accuracy.
Innovation Solution
The implementation of a guide vane upstream of sensors in the exhaust duct to increase the flow velocity of exhaust gas locally at the sensor's location, ensuring sufficient momentum exchange and reducing residence time of exhaust gas, thereby enhancing measurement accuracy and reliability without increasing back pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the exhaust duct cross-section is reduced to increase flow velocity around the sensor, then measurement accuracy is improved, but back pressure increases
Solution Approach 1:
The patent applies local quality by introducing a guide vane that creates a localized high-velocity flow region specifically at the sensor location, rather than reducing the entire exhaust duct cross-section. The guide vane is positioned upstream of the sensor and designed to accelerate exhaust gas only in the immediate vicinity of the sensor, achieving sufficient flow velocity for accurate measurement without increasing back pressure throughout the entire exhaust system.
2Measurement precision
If the exhaust gas flow velocity is increased to improve measurement response time, then measurement accuracy is improved, but the residence time of exhaust gas decreases
Solution Approach 1:
The guide vane performs preliminary action by pre-accelerating the exhaust gas flow before it reaches the sensor. The vane is positioned upstream and designed to create a focused high-velocity flow region that arrives at the sensor with sufficient momentum to ensure rapid and accurate measurement response, while the overall residence time in the exhaust duct remains unchanged.
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
This solution ensures accurate and reliable measurements by increasing flow velocity around sensors, improving response time and measurement accuracy while maintaining low exhaust gas back pressure and avoiding structural changes to the exhaust duct.
Implementation Method 1
the guide vane is designed to increase the flow velocity of the exhaust gas in a local flow cross-section of the exhaust duct at the height of the sensor
Data Source
AI summary
An exhaust system for an internal combustion engine, in the exhaust duct of which a sensor is arranged for determining the exhaust gas composition. Furthermore, upstream of the sensor a guide vane is arranged, which is designed to increase the flow velocity of the exhaust gas in a local flow cross-section of the exhaust duct at the height of the sensor. This makes it possible to provide sufficiently high flow velocities of the exhaust gas at the sensor.