Projector Cooling Flow Path Diagnosis via Pump Rotation Thresholds
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Solution Overview
Problem
Existing projector cooling devices lack the ability to diagnose the state of the flow path for the cooling liquid, leading to potential overheating of the liquid crystal panel when the flow path becomes closed, preventing effective cooling.
Innovation Solution
A flow path diagnosis method that acquires the number of rotations of a pump and environmental temperature, sets threshold values based on temperature conditions, and determines the flow path's normalcy or abnormality, preventing the flow path from becoming closed and ensuring continuous cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cooling device operates without flow path diagnosis, then the device complexity is reduced, but the reliability of cooling function deteriorates when the flow path becomes closed
Solution Approach 1:
The patent implements a feedback mechanism by monitoring the number of rotations of the pump and comparing it against threshold values to diagnose flow path abnormalities. The control circuit continuously acquires pump rotation data and environmental temperature, then determines whether the flow path is normal or abnormal based on predefined thresholds. This closed-loop feedback system ensures reliable cooling function detection without requiring complex additional hardware.
2Measurement precision
If a fixed threshold value is used for pump rotation diagnosis, then the ease of operation is improved, but the measurement precision deteriorates across different environmental temperatures
Solution Approach 1:
The patent dynamically adjusts the threshold value for pump rotation diagnosis based on environmental temperature. When the environmental temperature is below a predetermined threshold, a first threshold value is used; when the temperature is at or above the threshold, a second (higher) threshold value is applied. This parameter adaptation ensures accurate flow path diagnosis across varying operating conditions without requiring complex diagnostic algorithms.
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 method effectively prevents the cooling target from overheating by accurately diagnosing flow path abnormalities, ensuring continuous cooling of the liquid crystal panel and maintaining projector performance.
Implementation Method 1
a pump configured to send the refrigerant to the flow path
Implementation Method 2
a refrigerant for cooling a cooling target
Data Source
AI summary
A flow path diagnosis method includes: acquiring the number of rotations of a pump configured to send a refrigerant for cooling a cooling target to a flow path through which the refrigerant circulates; acquiring an environmental temperature; setting a first threshold value as a threshold value of the number of rotations when the environmental temperature is lower than a first temperature; setting a second threshold value higher than the first threshold value as the threshold value when the environmental temperature is equal to or higher than the first temperature; determining that the flow path is normal when the number of rotations is less than the threshold value; and determining that the flow path is abnormal when the number of rotations is equal to or more than the threshold value.