Rectification Body With Segmented Ribs For Airflow Stability
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Solution Overview
Problem
Existing rectification structures in internal combustion engine intake systems, such as those with curved rectifiers, often lead to unstable airflow sensor outputs and poor sensing performance due to manufacturing errors like burrs or steps at welded portions, causing air flow disturbances and reduced accuracy in fuel control.
Innovation Solution
A rectification structural body with a chamber divided into two cases, featuring arc-shaped ribs that protrude and overlap with a predetermined spacing, forming a flow path wall that stabilizes airflow and includes a Helmholtz resonator to enhance sensing performance and reduce noise, thereby minimizing the impact of manufacturing inaccuracies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a rectification structure with curved rectifier is used to improve flow rate measurement accuracy, then measurement accuracy is improved, but manufacturing errors like burrs or steps at welded portions cause air flow disturbances and unstable airflow sensor outputs
Solution Approach 1:
The rectification structure is divided into multiple separate rectification elements (first rectification element and second rectification element) that are arranged in parallel. This segmentation allows each element to be manufactured independently with fewer welding operations, reducing burrs and steps that cause flow disturbances. The parallel arrangement maintains effective rectification while improving output stability.
Solution Approach 2:
Multiple rectification elements are combined in a parallel configuration within the same housing. This merging of multiple independent rectification paths provides redundancy and stability to the airflow, ensuring that manufacturing errors in one element do not significantly impact overall sensor output stability while maintaining measurement accuracy.
2Shape
If a rectification structure with welded portions is used to achieve curved rectifier shape, then flow path guidance is improved, but welding burrs or steps cause air flow disturbances
Solution Approach 1:
The curved rectifier shape is achieved through multiple separate rectification elements rather than a single welded structure. Each element can be formed with smooth curved surfaces using molding or bending processes, eliminating the need for welding and the associated burrs and steps that cause air flow disturbances.
Solution Approach 2:
The rectification elements feature smooth curved surfaces that guide airflow efficiently. By using curved geometries formed through processes like injection molding or sheet metal bending rather than welding, the design achieves the desired shape while avoiding manufacturing defects that disrupt airflow.
3Stability of the object's composition
If traditional rectification structure is used to stabilize airflow, then some flow rectification is achieved, but sensing performance remains poor due to flow disturbances
Solution Approach 1:
The airflow is divided into multiple parallel streams through separate rectification elements. This segmentation allows each element to independently stabilize its portion of the airflow, and the combined effect provides superior overall stability and sensing performance compared to traditional single-structure approaches.
Solution Approach 2:
Each rectification element is designed with specific local geometric features optimized for its position in the parallel arrangement. This localized optimization of rectification characteristics across multiple elements enhances overall airflow stability and sensing performance beyond what a uniform traditional structure can achieve.
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 proposed rectification structural body stabilizes airflow sensor outputs, enhances sensing performance, and reduces noise in the intake system by minimizing air flow disturbances and burrs, leading to improved fuel efficiency and engine control.
Implementation Method 1
a substantially arc-shaped first rib is provided to protrude from the first case, an end portion of the first rib is apart from the second case, a substantially arc-shaped second rib is provided to protrude from the second case, the second rib is provided substantially parallel to the first rib to overlap with the first rib with a predetermined spacing, and the first rib and the second rib form, in the chamber, a flow path wall such that a flow of air flowing into the chamber through the inlet port curves and directs toward the outlet port
Implementation Method 2
A rectification structural body with a chamber divided into two cases, featuring arc-shaped ribs that protrude and overlap with a predetermined spacing, forming a flow path wall that stabilizes airflow and includes a Helmholtz resonator to enhance sensing performance and reduce noise
Data Source
AI summary
A rectification structural body includes an inlet port into which air from an air cleaner flows, an outlet port from which air flows out toward an airflow sensor, and a chamber provided between the inlet port and the outlet port. The inlet port and the outlet port are provided in such directions and at such positions that an air flow is bent in the chamber. The chamber includes two cases of a first case and a second case, the chamber being divided into the two cases.