Control System Temperature Sensor Fault Detection
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Solution Overview
Problem
Existing control systems for liquid-crystal display devices cannot accurately determine whether the failure to detect an increase in temperature is due to an abnormality in the temperature sensor, outside air temperature changes, or other causes during electric power supply to the light source.
Innovation Solution
A control system comprising two control devices, two temperature sensors, and a determining unit that compares temperature values from each sensor to determine if either sensor is faulty by setting a preset threshold value, allowing for accurate identification of sensor abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single temperature sensor is used to monitor device temperature during light source operation, then the device can detect temperature increases, but it cannot determine whether the failure to detect temperature increase is due to sensor abnormality or external factors such as outside air temperature changes
Solution Approach 1:
The patent applies local quality by making each temperature sensor monitor a specific local position (first control device and second control device respectively) while both sensors use the same monitoring method. This localized monitoring approach allows comparison of temperature trends at different positions to identify sensor failures, resolving the contradiction between monitoring reliability and fault detection accuracy.
Solution Approach 2:
The determining unit implements feedback by continuously comparing temperature values from both sensors and comparing the temperature increase trend with the power supply state of the light source. When the temperature increase does not match the expected trend based on power supply, the system identifies potential sensor failure and adjusts control accordingly, thereby improving both monitoring reliability and fault detection accuracy.
2Productivity
If electric power is supplied to the light source and temperature monitoring is performed, then the device can operate normally, but it cannot distinguish between actual temperature stability and sensor failure to detect temperature increase
Solution Approach 1:
The system uses feedback by comparing the temperature increase trend with the power supply state. When power is supplied to the light source, the temperature should increase; if the sensor fails to detect this expected increase, the determining unit identifies sensor failure. This feedback mechanism maintains productivity while improving reliability detection.
Solution Approach 2:
The determining unit acts as an intermediary that compares temperature data from both sensors and cross-validates the readings. By introducing this intermediary comparison layer, the system can distinguish between actual temperature stability and sensor failure, maintaining continuous operation while improving reliability.
3Loss of information
If temperature monitoring is performed using existing techniques, then the device can track temperature changes, but it cannot accurately determine the cause of temperature detection failure during light source operation
Solution Approach 1:
The patent segments the temperature monitoring function by using two separate temperature sensors instead of one, with each sensor monitoring a specific control device. The determining unit then segments the analysis by comparing each sensor's data independently and identifying which sensor may be failing. This segmentation prevents information loss while keeping the added complexity manageable through systematic comparison.
Solution Approach 2:
The determining unit implements feedback by continuously comparing temperature readings from both sensors and comparing them with the power supply state. When temperature information from one sensor does not match the expected trend or differs significantly from the other sensor, the system identifies potential information loss and compensates accordingly, maintaining accurate temperature awareness without excessive complexity.
Data Source
AI summary
A determining unit performs failure determination for lights. In failure determination, a first temperature value and a second temperature value are compared, and when the difference between the first temperature value and the second temperature value is equal to or higher than a preset determination threshold value, either one of a first temperature sensor and a second temperature sensor is determined to be faulty. The first temperature value is the temperature value of a first control device acquired by the first temperature sensor during the execution of lighting control of a first lamp. The second temperature value is the temperature value of a second control device acquired by the second temperature sensor during the execution of lighting control of a second lamp.