Scanning Vehicle Lamp Control to Prevent Flicker at Startup
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Solution Overview
Problem
Vehicle lamps with a scan method can experience flicker when the light source is turned on before the driving unit stabilizes, leading to discomfort for the driver and potential issues with the driving unit's lifetime due to premature shutdowns.
Innovation Solution
A vehicle lamp system that includes a light source, a driving unit, and a reflective body scanning a beam, with a controlling unit that ensures the driving unit operates for a duration even after a stop instruction is received, allowing the light source to stabilize before turning on, and maintaining operation while the second lamp unit is emitting a beam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the light source is turned on before the driving unit stabilizes, then the lighting can be activated immediately, but flicker occurs causing driver discomfort
Solution Approach 1:
The driving unit is activated in advance before the light source is turned on, allowing it to stabilize its operation. This preliminary action ensures that when the light source is subsequently activated, the driving unit is already stable, preventing flicker and ensuring smooth lighting activation without driver discomfort.
2Duration of action of stationary object
If the driving unit is stopped while the light source is off to extend lifetime, then the driving unit lifetime is extended, but waiting time increases causing driver discomfort
Solution Approach 1:
The driving unit is activated in advance before the light source is turned on, allowing it to stabilize its operation. This preliminary action ensures that when the light source is subsequently activated, the driving unit is already stable, preventing flicker and ensuring smooth lighting activation without driver discomfort.
Solution Approach 2:
The driving unit maintains continuous operation even when the light source is off, avoiding repeated start-stop cycles. This continuous operation extends the driving unit's lifetime by preventing mechanical stress from frequent activations while ensuring immediate response when lighting is needed.
3Speed
If the driving unit stops immediately upon receiving stop instruction, then the response is immediate, but the light source may not have stabilized causing flicker
Solution Approach 1:
The driving unit is activated in advance before the light source is turned on, allowing it to stabilize its operation. This preliminary action ensures that when the light source is subsequently activated, the driving unit is already stable, preventing flicker and ensuring smooth lighting activation without driver discomfort.
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 extends the lifetime of the driving unit and reduces driver discomfort by ensuring stable operation and timely lighting activation, minimizing flicker and wait times.
Implementation Method 1
light from a light source is made incident on a reflective body that is driven by a driving unit to repeat a periodic motion. The reflective body reflects incident light at an angle corresponding to the position of the reflective body in the periodic motion and scans the space in front of the vehicle with the reflected light
Data Source
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AI summary
A vehicle lamp includes a first lamp unit that includes a light source, a driving unit, and a reflective body that is driven by the driving unit to repeat a periodic motion and thus scans an exit beam from the light source; and a controlling unit that controls the first lamp unit. The controlling unit instructs that the driving unit be driven until a first duration T1 has passed even in a case where the controlling unit has received an illumination instruction instructing the first lamp unit to emit a beam and then received a stop instruction instructing the first lamp unit to stop emitting a beam.