Air Flow Sensor Guiding Wall for Dust Protection
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Solution Overview
Problem
Air flow rate measuring devices for internal combustion engines face challenges in reducing the amount of foreign substances, such as dust, that enter the sub-bypass passage and potentially damage the sensor chip, especially when air cleaners have low capturing power or in dusty environments.
Innovation Solution
The air flow rate measuring device incorporates a guiding wall that changes the flow direction of intake air upstream of the sub-bypass passage branching area, reducing the kinetic energy of foreign substances and minimizing their entry into the sub-bypass passage, thereby protecting the sensor chip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a main-bypass passage and sub-bypass passage are used to protect the sensor, then the sensor is protected from foreign substances, but foreign substances can still enter the sub-bypass passage and damage the sensor chip
Solution Approach 1:
The guiding wall is positioned upstream of the branching area to preliminarily change the flow direction and reduce kinetic energy of foreign substances before they reach the sub-bypass passage, preventing their entry into the sensor housing area
Solution Approach 2:
The guiding wall creates a localized flow modification zone upstream of the branching area, where the flow characteristics (direction and kinetic energy) are specifically altered to protect the sensor without affecting the overall bypass passage functionality
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 design effectively decreases the amount of foreign substances entering the sub-bypass passage, reducing the likelihood of collisions and adhesion to the sensor chip, enhancing the device's accuracy and durability.
Implementation Method 1
it is possible to bring foreign substances, which were taken in from the inlet together with the intake air, into contact with the guiding wall. Hence, kinetic energy of the foreign substances can be reduced by the collisions with the guiding wall
Data Source
AI summary
The present disclosure provides an air flow rate measuring including a casing and a sensor. The casing includes a main-bypass passage that defines an inlet and an outlet, a sub-bypass passage that branches off from the main-bypass passage at a branching area, and a guiding wall that changes, at a position upstream of the branching area, a flow direction of the passing air taken in from the inlet. The inlet and the guiding wall are arranged in an arranging direction along a flow direction of the intake air in the duct. The guiding wall includes an inlet side surface that faces the inlet and is not perpendicular to the arranging direction.