Vehicular Headlamp Cooling Fan Speed Adjustment
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Solution Overview
Problem
Vehicular headlamps with cooling fans experience reduced lifespan due to continuous operation during daytime running lights, leading to increased failure rates and shortened fan lifespan, as the forced cooling method is not optimized for reduced light output states.
Innovation Solution
A vehicular headlamp design that adjusts the output current of the power converting unit to control the rotation speed of the cooling fan based on light states, allowing for reduced fan operation during daytime running light conditions, thereby extending fan lifespan while maintaining heat dissipation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the cooling fan is continuously rotated when the light source is turned on, then the heat dissipating performance is maintained, but the life span of the cooling fan is significantly lowered
Solution Approach 1:
The cooling fan's rotation speed is made dynamic rather than continuous. The control unit adjusts the fan speed based on the actual heating value of the light source, allowing the fan to operate at variable speeds including stopping completely when not needed, thereby extending its lifespan while maintaining adequate heat dissipation when required
Solution Approach 2:
The operating parameters of the cooling fan are changed based on light source conditions. By monitoring the heating value and adjusting the fan's rotation speed accordingly, the system optimizes the balance between heat dissipation performance and fan durability, preventing unnecessary continuous operation
2Duration of action of stationary object
If the cooling fan rotation speed is lowered to extend life span, then the fan lifespan is prolonged, but the heat dissipating performance may be compromised
Solution Approach 1:
The control unit implements feedback control by monitoring the heating value of the light source and adjusting the cooling fan's rotation speed accordingly. This ensures that the fan operates at the minimum necessary speed to maintain adequate heat dissipation, avoiding both excessive operation (which shortens lifespan) and insufficient operation (which compromises cooling performance)
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 solution prolongs the life of the cooling fan and reduces failure rates by optimizing fan operation based on light states, ensuring satisfactory heat dissipation and extending the headlamp's overall lifespan.
Implementation Method 1
A so-called forced cooling method using a cooling fan has an excellent heat dissipating performance
Implementation Method 2
a light source provided in the lamp case; a power converting unit connected to the light source and configured to obtain an output current to light up the light source
Data Source
AI summary
An object of the present disclosure is to reduce a failure rate due to a prolonged life span of a cooling fan while maintaining a satisfactory heat dissipating performance. When a signal indicating a first light-up state is input, a control unit sets a current value of an output current to a predetermined value such that a cooling fan is rotated at a predetermined rotation speed, and when a signal indicating a second light-up state is input, the control unit lowers the current value of the output current to a value lower than the predetermined value such that the rotation speed of the cooling fan is lower than the predetermined rotation speed. Therefore, the life span of the cooling fan may be prolonged while maintaining the satisfactory heat dissipating performance.