Liquid Crystal Projector Cooling Fan Control via Air Pressure
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Solution Overview
Problem
Conventional liquid crystal projectors rely on temperature-based control for cooling fans, which reduces efficiency in low air density areas like highlands, necessitating user-defined settings for different regions.
Innovation Solution
Incorporating both a temperature sensor and an air pressure sensor to automatically control the cooling fan's revolutions using a control table that correlates air pressure classes with temperature and control voltage values, ensuring optimal cooling performance across varying environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If temperature-based control is used for cooling fan, then control is simple, but cooling efficiency is lowered in low air density areas
Solution Approach 1:
The patent applies parameter changes by introducing air pressure as an additional control parameter alongside temperature. The control device now considers both temperature and air pressure to determine fan revolutions, allowing the system to adapt to different air density conditions (highland vs flatland) and maintain optimal cooling efficiency across varying environments.
2Reliability
If user-defined settings for different regions are implemented, then cooling performance is optimized, but ease of operation is reduced
Solution Approach 1:
The system applies self-service by automatically detecting air pressure and selecting the appropriate control table without user intervention. The control device reads air pressure, determines the corresponding control table automatically, and adjusts fan revolutions based on both temperature and air pressure, eliminating the need for users to manually configure regional settings.
Solution Approach 2:
The patent implements feedback by continuously monitoring air pressure and temperature, then automatically adjusting fan control based on these readings. The system uses feedback from sensors to dynamically select control parameters and adjust fan revolutions, ensuring optimal cooling performance adapts to current environmental conditions without user input.
3Measurement precision
If air pressure sensor is added, then cooling control accuracy is improved, but device complexity increases
Solution Approach 1:
The control device is designed with multi-functionality, serving both temperature-based control and air pressure-based control. By integrating air pressure sensing and using multiple control tables for different regions, the system achieves universal adaptability across various environments without requiring completely separate control systems for different scenarios.
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 solution enables automatic and efficient cooling fan control based on air pressure, enhancing performance in diverse geographical locations without requiring user-specific settings, thus improving energy savings and noise reduction.
Implementation Method 1
a temperature sensor for detecting the internal temperature of the liquid crystal projector
Implementation Method 2
an air pressure sensor for detecting outside air pressure
Implementation Method 3
air cooling is performed by a cooling fan
Data Source
AI summary
A liquid crystal projector provided with a cooling fan comprises a temperature sensor for detecting the internal temperature of the liquid crystal projector, an air pressure sensor for detecting outside air pressure, and a control device for controlling the number of revolutions of the cooling fan on the basis of the temperature detected by the temperature sensor and the outside air pressure detected by the air pressure sensor.