Air Purifier Filter Lifespan Estimation Using Motor Current
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Solution Overview
Problem
Existing methods for calculating the lifespan of a filter core in air purifiers are inaccurate, relying on service time periods which do not account for the filter's dirty condition, leading to inefficiencies in determining when the filter needs replacement.
Innovation Solution
A method and device that control an electric motor to rotate at a predetermined speed, acquire sampled parameters such as current or voltage, and determine the consumed lifespan based on these values, establishing a positive correlation to assess the filter's dirty degree and lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If service time period is used to calculate consumed lifespan, then calculation method is simple, but accuracy of lifespan calculation deteriorates
Solution Approach 1:
The patent changes the parameter basis from service time to motor current/voltage parameters. By monitoring the actual electrical parameters during motor operation and correlating them with filter dirt accumulation, the system achieves accurate lifespan calculation that reflects real filter condition rather than just elapsed time.
2Ease of operation
If service time period is recorded and multiplied with coefficients, then calculation process is straightforward, but reliability of lifespan determination worsens
Solution Approach 1:
The patent implements feedback by continuously monitoring motor current or voltage parameters during operation and using these real-time measurements to determine filter lifespan. This creates a closed-loop system where actual operating conditions feed back into the lifespan calculation, improving reliability by reflecting true filter loading conditions rather than relying on predetermined time coefficients.
Data Source
AI summary
A method and a device for calculating a consumed lifespan are provided. The method includes: controlling an electric motor of a purifier to rotate at a predetermined speed; acquiring a value of a sampled parameter of the electric motor, the sampled parameter being at least one of a sampled current and a sampled voltage of the electric motor; and determining a consumed lifespan of the purifier according to the acquired value of the sampled parameter, wherein the consumed lifespan is in positive correlation with the acquired value of the sampled parameter.