Resettable Air Filter Status Indicator Using Diaphragm Spring
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing air filter restriction indicating devices for internal combustion engines are complex, costly, and difficult to integrate into existing air filter housings, lacking a simple and cost-effective way to visually indicate when the air filter requires replacement.
Innovation Solution
A resettable air filter status indicator is integrally formed into the sidewall of the air filter housing, using a diaphragm spring that moves in response to air intake pressure differential with respect to atmospheric pressure to provide a visually perceivable signal for replacement, allowing for a mechanically simpler and cost-effective solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing air filter restriction indicating devices are used, then air filter replacement can be indicated, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent employs a flexible diaphragm element that deflects in response to pressure differential changes across the air filter. This thin film structure provides a reliable indication mechanism while maintaining simplicity and low manufacturing cost, directly resolving the contradiction between reliability and device complexity.
Solution Approach 2:
The invention utilizes pneumatic pressure differential to actuate the diaphragm and trigger the indication mechanism. By leveraging the natural pressure differences that occur during engine operation, the system achieves reliable filter status indication without requiring complex mechanical or electronic components.
2Reliability
If complex indicating devices are integrated into air filter housing, then replacement can be signaled, but manufacturing cost and integration difficulty increase
Solution Approach 1:
The patent combines the indication mechanism directly with the air filter housing structure, integrating the diaphragm assembly and trigger mechanism into a unified component. This merging approach simplifies manufacturing by reducing the number of separate parts and assembly steps while maintaining reliable replacement signaling.
Solution Approach 2:
The indication device is designed to be self-actuating through the pressure differential generated during normal engine operation. The diaphragm automatically deflects when filter restriction reaches the threshold, eliminating the need for external power sources, sensors, or complex control systems, thereby reducing manufacturing cost and integration difficulty.
3Ease of manufacture
If simple indicator mechanisms are used, then manufacturing cost decreases, but the ability to provide accurate replacement indication may be compromised
Solution Approach 1:
The patent utilizes changes in pressure differential parameters to trigger the indication mechanism. As the pressure difference across the air filter increases due to filter restriction, the diaphragm deflects progressively until it triggers the indication at a predetermined threshold. This parameter-based approach ensures accurate and reliable replacement indication while maintaining manufacturing simplicity.
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 solution provides a reliable and cost-effective means to indicate when the air filter requires replacement, simplifying integration into existing systems and reducing manufacturing costs while effectively signaling the need for filter replacement based on pressure differential changes.
Implementation Method 1
a diaphragm spring that moves in response to air intake pressure differential with respect to atmospheric pressure
Data Source
AI summary
An air filter system for an internal combustion engine of a vehicle can have an indicator for signaling restricted flow of air through a replaceable air filter member mounted to a filter assembly. At least one sidewall can be associated with the replaceable air filter member to be positioned with an air stream passing through the air filter member. A resettable air filter status indicator can provide a visually perceivable signal external of the filter assembly. The resettable air filter status indicator can be integrally formed in the sidewall for indicating if a mounted air filter member requires replacement in response to air intake differential pressure with respect to atmospheric pressure on a downstream side of air flow through the replaceable filter member being above a predetermined threshold value.