Intake Device Conductive Wall Grounding for Sensor Protection
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Solution Overview
Problem
In intake devices, self-discharge static eliminators can lead to charge accumulation, causing foreign matter to electrodeposite on surfaces, increasing intake resistance and contaminating sensors, which hinders intake efficiency and degrades sensor performance.
Innovation Solution
An intake device with an electrically conductive passage wall and an air physical quantity sensor grounded to the passage wall, allowing for the quick release of negative charges, preventing foreign matter from electrodepositing and reducing intake resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a self-discharge static eliminator is installed on the wall surface of the intake passage, then charge accumulation is reduced and intake efficiency is improved, but foreign matter electrodeposits on the sensor and contamination increases
Solution Approach 1:
The patent extracts the harmful electrostatic charge from the intake passage by providing a dedicated grounding structure that removes charges before they can reach the sensor. The grounding structure is electrically connected to the passage wall and provides a discharge path that prevents charge accumulation on the sensor surface, thereby solving the contamination problem while maintaining the benefits of static elimination.
Solution Approach 2:
The grounding structure acts as an intermediary between the charged passage wall and the sensor. It provides a controlled discharge path that prevents direct electrodeposition of foreign matter on the sensor while still allowing static charge to be managed in the intake passage. This mediator approach resolves the contradiction by intercepting charges before they harm the sensor.
2Object-affected harmful factors
If the passage wall is made electrically conductive to prevent charge accumulation, then foreign matter electrodeposition is reduced, but the complexity of the device increases
Solution Approach 1:
Instead of making the entire passage wall conductive, the patent applies electrical conductivity only in the specific local area where charges need to be discharged. The grounding structure is positioned at a strategic location near the sensor to provide charge discharge functionality only where necessary, maintaining simplicity while effectively preventing electrodeposition on the sensor.
Solution Approach 2:
The patent changes the electrical parameter (conductivity) of a specific portion of the passage structure by adding a grounding connection. This localized parameter change allows charges to be dissipated without requiring the entire passage to be conductive, thus minimizing the increase in device complexity while achieving the desired effect of reducing electrodeposition.
3Productivity
If charge accumulation occurs in the self-discharge static eliminator, then the potential becomes high and intake resistance increases, but adding grounding structures increases device complexity
Solution Approach 1:
The patent merges the grounding function with the existing passage wall structure. The grounding structure is integrated into the passage wall rather than being a separate component, thereby providing charge discharge functionality without significantly increasing device complexity. This consolidation approach maintains intake efficiency while minimizing structural complexity.
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 configuration improves intake efficiency by reducing resistance and minimizes sensor contamination, enhancing both air flow and sensor accuracy.
Implementation Method 1
a grounding structure electrically connected to the passage wall portion for grounding the sensor element
Implementation Method 2
The passage wall portion is electrically conductive and exposed to the intake passage
Data Source
AI summary
An intake device includes an air filter that filters intake air for an internal combustion engine, a filter casing housing the air filter, and an air physical quantity sensor. The filter casing includes an intake passage to allow the intake air to pass from upstream to downstream of the air filter. The filter casing has a passage wall portion that is electrically conductive and exposed to the intake passage on a downstream side of the air filter. The air physical quantity sensor has: a sensor element that detects a specific physical quantity related to the intake air on a downstream side of the air filter; and a grounding structure electrically connected to the passage wall portion for grounding the sensor element.