Vehicle Defogger Current Feedback for Auto Shutoff Timing
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Solution Overview
Problem
Existing defoggers in vehicles consume significant power due to prolonged operation after fog removal, leading to inefficiencies and potential overheating risks.
Innovation Solution
A controller that monitors current values through a heating wire to determine when the wire reaches a stable resistance, turning off the defogger when the current stabilizes, thereby optimizing power usage and ensuring complete fog removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the defogger operates for a fixed period after being turned on, then the fog removal function is ensured, but the power consumption increases due to prolonged operation after fog removal
Solution Approach 1:
The controller continuously monitors the current value flowing through the heating wire and uses this feedback to determine when to turn off the defogger. When the current value converges to a constant value, indicating fog removal is complete, the controller automatically shuts off the defogger, avoiding prolonged operation and reducing power consumption while ensuring effective fog removal.
Solution Approach 2:
The defogger operation time is made dynamic rather than fixed. The system adjusts the operation duration based on real-time current monitoring, extending operation only as long as necessary until the current convergence condition is met, thereby optimizing the balance between fog removal effectiveness and power consumption.
2Use of energy by moving object
If the defogger is turned off immediately when fog is removed, then power consumption is reduced, but the determination of fog removal timing becomes inaccurate
Solution Approach 1:
The system uses continuous current monitoring as feedback to accurately detect when fog removal is complete. By observing whether the current value converges to a constant value over time, the system achieves precise determination of the fog removal timing, turning off the defogger at the optimal moment to minimize power consumption without sacrificing detection accuracy.
Solution Approach 2:
The patent replaces traditional mechanical or time-based defogger control mechanisms with an electrical measurement-based system. Instead of using fixed timers or mechanical switches, the system uses electrical current monitoring to detect fog removal, providing more accurate and adaptive control.
3Reliability
If the defogger operates continuously, then fog removal is ensured, but overheating risks increase
Solution Approach 1:
The controller uses real-time current monitoring as feedback to detect when fog removal is complete (indicated by current convergence). This allows the system to shut off the defogger promptly, preventing continuous operation that could lead to overheating, while still ensuring reliable fog removal during the necessary operation period.
Solution Approach 2:
The system takes preliminary action to prevent overheating by continuously monitoring current values and preparing to shut off the defogger as soon as the convergence condition is met. This proactive approach prevents the harmful effect of overheating before it can occur, while maintaining fog removal effectiveness.
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 controller efficiently manages defogger operation by turning off when current stabilizes, reducing unnecessary power consumption and ensuring effective fog removal, while improving determination accuracy through power and environmental data logging.
Implementation Method 1
a heating wire disposed on a window glass of a vehicle... By energizing the heating wire, the window glass can be heated
Implementation Method 2
the window glass can be heated, thereby removing fog or the like formed on the window glass
Data Source
AI summary
A controller for a defogger including a heating wire disposed on a window glass of a vehicle turns on the defogger. The controller repeatedly acquires a value of current flowing through the heating wire while the defogger is on. The controller turns off the defogger based on the value of the current having converged to a constant value.