Vehicle Lamp Control for Shared Light Face Chromaticity
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Solution Overview
Problem
The combination lamp designed for vehicles faces challenges in complying with North American regulations, which require the position lamp to remain on when the turn lamp is activated, while also ensuring chromaticity requirements are met and merchantability is maintained.
Innovation Solution
A lamp lighting control system that includes a turn lamp, a position lamp, an accessory lamp, and a lighting control unit. The control unit, equipped with processors and memories, manages the lighting states of these lamps, turning off the accessory lamp when the position and turn lamps are on, and turning on the accessory lamp when the position lamp is on and the turn lamp is off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the turn lamp and position lamp are caused to emit light from the same light-emitting face, then the mounting space is utilized efficiently, but the turn lamp does not satisfy chromaticity requirements when the position lamp is turned on
Solution Approach 1:
The light-emitting face is segmented into multiple independent light-emitting elements (turn lamp LED, position lamp LED, accessory lamp LED) that can be controlled separately. This allows each element to contribute to the overall light output while maintaining independent chromaticity control, enabling compliance with chromaticity requirements even when multiple lamps share the same physical emitting surface.
2Manufacturing precision
If the brightness of the turn lamp is increased by increasing the amount of current supplied to the turn lamp, then the chromaticity requirements for the turn lamp are satisfied, but the electric consumption of the turn lamp increases greater than the electric consumption of a bulb generally used in a head lamp
Solution Approach 1:
The system merges the light-emitting functions of the turn lamp and position lamp into a shared light-emitting face with multiple LED elements. By combining the light output from the position lamp LED and accessory lamp LED, the turn lamp LED can operate at lower current while still achieving sufficient overall brightness and chromaticity compliance, thereby reducing electric consumption compared to using a high-power bulb.
3Object-generated harmful factors
If the position lamp is designed to emit orange light, then color mixture is prevented, but the merchantability is impaired by the position lamp emitting orange light which is different from an intended light color
Solution Approach 1:
Different regions of the light-emitting face are assigned different light colors based on their functional requirements. The position lamp LED emits white light (intended color for merchantability) while the turn lamp LED emits orange light. The control system manages the local quality of light emission from each element, allowing white light from the position lamp when the turn lamp is off, thus maintaining merchantability without harmful color mixture.
Data Source
AI summary
Provided is a lamp lighting control system including a turn lamp, a position lamp configured to provide a light-emitting face included in a light-emitting face provided by the turn lamp, an accessory lamp configured to provide a light-emitting face at least partially identical to the light-emitting face provided by the turn lamp, and a lighting control unit that is configured to control lighting states of the turn lamp, the position lamp, and the accessory lamp. The lighting control unit is configured to turn off the accessory lamp in a case where the position lamp is turned on and the turn lamp is turned on, and turn on the accessory lamp in a case where the position lam is turned on and the turn lamp is turned off.