Vehicle Optical Device Defogging Control
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Solution Overview
Problem
Existing optical systems for vehicles struggle to effectively defog windshields due to temperature and humidity differences between the vehicle interior and exterior, leading to reduced functionality in foggy conditions.
Innovation Solution
An optical device with a heating unit, an opening and closing mechanism, and a controller that adjusts the airflow path based on outside air temperature and humidity differences to optimize defogging, ensuring effective windshield clearance regardless of environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heating means is used to defog the windshield glass, then the defogging capability is improved, but the power consumption increases
Solution Approach 1:
The system dynamically adjusts the heating power level based on environmental parameters (outside air temperature and humidity difference). When the humidity difference exceeds a threshold indicating fogging risk, heating is activated at appropriate power levels, thereby optimizing the balance between defogging effectiveness and power consumption.
Solution Approach 2:
The control unit continuously monitors the humidity difference between inside and outside air, and adjusts the heating means operation accordingly. This feedback mechanism ensures heating is applied only when necessary and at the minimum required power level, reducing unnecessary energy consumption while maintaining reliable defogging capability.
2Reliability
If the opening and closing unit is added to control airflow, then the defogging efficiency is improved, but the device complexity increases
Solution Approach 1:
The system divides the vehicle interior into two separate spaces: a closed space in front of the optical unit and a vehicle cabin internal space. The opening and closing unit controls airflow between these segmented spaces, allowing independent humidity control in the closed space to improve defogging efficiency without requiring complete system redesign.
Solution Approach 2:
The opening and closing unit acts as an intermediary mechanism that selectively controls air flow between the closed space and vehicle cabin internal space. This mediator allows the system to regulate humidity distribution and improve defogging efficiency while adding only the necessary minimal complexity through a single controllable airflow path.
3Speed
If heating power is increased to defog quickly, then the response speed is improved, but the energy loss increases
Solution Approach 1:
The heating means operates with periodic adjustment of power levels based on real-time humidity monitoring. The control unit activates heating at appropriate power levels when fogging conditions are detected, and adjusts or stops heating when the defogging objective is achieved, thereby improving response speed while minimizing energy loss through non-continuous operation.
Solution Approach 2:
The system applies heating power selectively and partially - only to the extent necessary to address the detected humidity difference and fogging condition. Rather than continuously applying maximum heating power, the control unit adjusts the heating level to match the actual defogging need, achieving adequate response speed while reducing energy loss from excessive heating.
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 optical device improves defogging capabilities by controlling airflow and heating to match environmental conditions, reducing power consumption and maintaining system functionality in foggy environments.
Implementation Method 1
a heating unit configured to heat the closed space
Implementation Method 2
an opening and closing unit that is disposed in an air flow path between the closed space and a vehicle cabin internal space and is configured to control communication of air between the closed space and the vehicle cabin internal space
Data Source
AI summary
An optical device includes an optical unit that is disposed with a closed space interposed between the optical unit and a windshield glass and is configured to acquire information of an outside of a vehicle cabin through the windshield glass, a heating unit that heats the closed space, an opening and closing unit that is disposed in an air flow path between the closed space and a vehicle cabin internal space and controls communication of air between the closed space and the vehicle cabin internal space, and a controller that controls an open and closed state of the opening and closing unit based on either an outside air temperature of a vehicle or a difference in humidity acquired by subtracting a humidity of the vehicle cabin internal space from a humidity of the closed space.