Vehicle Window Glass Heating Control Standby Period
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Solution Overview
Problem
Existing window glass heating apparatuses for vehicles often lead to heat deterioration of electric heating wires and window glass due to improper energization control, especially when users frequently switch the heating on and off, resulting in short energization stop periods and excessive temperature increases.
Innovation Solution
A window glass heating apparatus with a control unit that starts energization only when a permission condition is met and stops it after a predetermined time or when the condition becomes unsatisfied, incorporating a standby period to allow temperatures to decrease, thereby preventing heat deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the energization control is built such that the energization of the electric heating wire is started at the same time as the operation of the switch, then the user can immediately start the heating function when needed, but the temperatures of the electric heating wire and window glass may increase excessively causing heat deterioration
Solution Approach 1:
The control unit measures the elapsed time from the last switch operation and determines whether to permit energization based on this preliminary time measurement. This preliminary action prevents immediate energization when temperatures are still high, thereby avoiding heat deterioration while still allowing quick heating when appropriate.
Solution Approach 2:
The control unit continuously monitors the elapsed time since the last switch operation and uses this feedback information to make real-time decisions about whether to permit energization. This feedback mechanism dynamically adjusts heating control based on current temperature conditions inferred from time elapsed, preventing heat deterioration while maintaining operational responsiveness.
2Reliability
If temperature sensors are added to detect temperatures of the electric heating wire and window glass, then heat deterioration can be prevented by controlling energization based on temperature, but the manufacturing cost increases
Solution Approach 1:
The system uses the existing switch operation timing information to infer temperature conditions and control energization accordingly. Instead of adding external temperature sensors, the system serves itself by using its own operational data (elapsed time since last switch operation) to make intelligent heating control decisions, thereby preventing heat deterioration without increasing manufacturing cost.
Solution Approach 2:
The control unit changes the control parameter from direct temperature measurement to elapsed time measurement. By measuring the time elapsed since the last switch operation instead of directly measuring temperature, the system achieves the same heat deterioration prevention function without requiring expensive temperature sensors, thus reducing manufacturing cost while maintaining reliability.
3Ease of operation
If the user frequently operates the switch to start and stop the energization control, then the heating can be precisely controlled according to user needs, but the energization stop period becomes extremely short causing excessive temperature increase
Solution Approach 1:
Before permitting energization, the control unit performs a preliminary check of the elapsed time since the last switch operation. This preliminary action determines whether the heating wire has cooled sufficiently, preventing users from accidentally causing heat deterioration through frequent switch operations while still allowing precise control when appropriate time intervals have passed.
Solution Approach 2:
The control unit provides feedback by comparing the elapsed time against a predetermined threshold before permitting energization. This feedback loop prevents frequent on-off operations from causing heat deterioration by blocking energization requests made too soon after previous operations, while still allowing users precise control over heating when they wait the appropriate time interval.
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 effectively reduces the likelihood of heat deterioration by ensuring that the electric heating wire and window glass temperatures decrease before further energization, thus extending the apparatus's lifespan and maintaining clear window glass while preventing cloud formation.
Implementation Method 1
an electric heating wire for heating a window glass of a vehicle
Data Source
AI summary
The invention relates to a window glass heating apparatus comprising an electric heating wire for heating a window glass of a vehicle. The apparatus continues to stop an energization of the wire until a predetermined energization standby time has elapsed after an energization permission condition becomes satisfied. The apparatus starts the energization of the wire when the predetermined energization standby time has elapsed after the energization permission condition becomes satisfied.