Secondary Filter Self-Positioning for Mass Flow Accuracy
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Solution Overview
Problem
Air filter systems for internal combustion engines face challenges in maintaining reliable flow characteristics and accurate mass flow sensor measurements due to disturbances from secondary filter element seams, especially during frequent filter element exchanges.
Innovation Solution
A filter system design featuring a secondary filter element with a longitudinal seam and end cap, connected to a stand pipe via self-positioning elements, ensures a defined rotational position on the stand pipe, minimizing flow disturbances and allowing for accurate positioning relative to mass flow sensors, ensuring reliable and reproducible measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a secondary filter element with a longitudinal seam is used, then the filter element can be manufactured and assembled, but the seam disturbs the flow characteristic and affects mass flow sensor measurements
Solution Approach 1:
The patent applies local quality by positioning the longitudinal seam of the secondary filter element at a specific location where it minimizes disturbance to the flow characteristic. The seam is strategically placed away from the mass flow sensor's measurement path, allowing the filter element to be manufactured with a seam while maintaining accurate sensor readings in the unaffected regions.
2Ease of operation
If the secondary filter element is freely positioned on the stand pipe, then assembly is simple, but the rotational position is undefined and causes flow disturbances
Solution Approach 1:
The patent implements self-service through self-positioning elements that automatically guide the secondary filter element into the correct rotational position during assembly. The stand pipe includes features such as positioning ribs or grooves that engage with corresponding features on the filter element, enabling the component to self-align and self-position without requiring external adjustment tools or complex assembly procedures.
3Reliability
If the secondary filter element remains in the housing during filter element replacement, then the clean side is protected from dirt particles, but the element needs to be exchanged eventually
Solution Approach 1:
The patent applies dynamics by designing the secondary filter element with a lifecycle that spans multiple primary filter element replacements. The element transitions from being a temporary protective component to a long-term stationary component that remains in the housing throughout several maintenance cycles, dynamically adapting its role from short-term protection to long-term flow management.
Data Source
AI summary
A filter system (100) having a housing (110), a fluid inlet (102) formed in a housing wall (112), a fluid outlet (108) formed in a housing wall (120), a primary filter element (50) and a secondary filter element (10). The secondary filter element (10) is arranged on a stand pipe (150) rigidly connected to one of the housing walls (120). The secondary filter element (10) includes a filter medium (16) forming a body (36) having at least one longitudinal seam (18) along a longitudinal axis (L) and an end cap (20) at its top region (12). The secondary filter element (10) and the stand pipe (150) are mutually connected by connection elements (22, 156). The secondary filter element (10) and the stand pipe (150) are configured with mutual self-positioning elements (30, 180) to arrange the secondary filter element (10) in a defined rotational position with respect to one or more struts (170).