Differential Pressure Sensor Coupler for Conduit Flow Area Changes
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Solution Overview
Problem
Conventional differential pressure measurement systems in aftertreatment components, such as particulate filters, are unreliable when the conduit diameter changes, leading to inaccurate soot loading predictions and potential filter failures due to frequent regeneration events or uncontrolled oxidation.
Innovation Solution
An apparatus and method for differential pressure measurement across a conduit flow area change, featuring a coupler with a tube inserted into a uniform flow region downstream of the aftertreatment component, allowing for accurate pressure measurement and software calibration to correlate with parameters like soot loading, reducing calibration and modeling efforts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional differential pressure measurement systems are used in conduits with diameter changes, then the system structure remains simple, but the measurement precision deteriorates due to inaccurate pressure readings
Solution Approach 1:
A flow area change compensation device is introduced as an intermediary component between the differential pressure sensor and the conduits. This device includes flow area change compensation holes that communicate with the sensor, allowing it to measure the actual differential pressure across the filter by compensating for the effects of conduit diameter changes, thereby improving measurement accuracy without significantly increasing overall system complexity
Solution Approach 2:
The invention changes the measurement parameters by introducing additional pressure measurement points through the compensation holes. Instead of measuring pressure at single points, the system measures pressure at multiple locations (upstream and downstream of each filter element) and uses these multiple parameter measurements to calculate the true differential pressure, improving accuracy in the presence of flow area changes
2Measurement precision
If software modeling and calibration are used to correct flow area change effects, then measurement precision improves, but the ease of manufacture and implementation deteriorates due to intensive modeling and calibration efforts
Solution Approach 1:
The flow area change compensation device enables the measurement system to self-correct for flow area changes through its physical structure. The compensation holes are positioned to automatically capture the pressure effects of flow area changes, allowing the system to self-compensate without requiring external software modeling or calibration procedures, thereby improving ease of manufacture and implementation
3Reliability
If differential pressure measurements are inaccurate due to conduit diameter changes, then the reliability of particulate filter monitoring deteriorates, but the device complexity remains low
Solution Approach 1:
The flow area change compensation device acts as an intermediary that isolates the differential pressure sensor from the effects of conduit diameter changes. By introducing compensation holes that capture representative pressure measurements, the device protects the accuracy of the monitoring system against variations in conduit geometry, thereby improving reliability without requiring complex adaptive measurement systems
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 approach provides reliable and accurate differential pressure measurements, reducing the risk of filter failures and improving fuel economy by correcting significant offsets between true and modeled pressures, thereby enhancing the longevity and performance of aftertreatment systems.
Implementation Method 1
a sensor configured to measure the differential pressure across the aftertreatment component
Data Source
AI summary
An apparatus, system, and method are disclosed for differential pressure measurement across a fluid conduit flow area change. The apparatus may include a particulate filter, a differential pressure sensor, and a fluid conduit size change downstream of the particulate filter. The apparatus may include a tube configured to place the downstream differential pressure sensor port in fluid contact with a uniform flow region of the fluid conduit downstream of the particulate filter. An apparatus is thereby provided to measure differential pressure across a fluid conduit flow area change such that the differential pressure measurement is minimally affected by the change in flow characteristics induced by the change in cross-sectional flow area.