In-Vehicle Wire Harness Multiplexing for Ceiling Equipment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The increasing number of in-vehicle equipment controls on vehicle ceilings leads to a rise in the number of electric wires needed, which is undesirable due to space constraints within vehicle pillars.
Innovation Solution
An in-vehicle equipment control system that uses a wire harness with a common transmission channel to transmit multiple information signals between the vehicle's lower side and ceiling, reducing the need for individual wires by using a power source line and multiplex communication line to supply power and control signals to ceiling-mounted equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If individual electric wires are provided for each equipment on the ceiling, then each equipment can be controlled independently, but the number of electric wires in the pillar increases
Solution Approach 1:
Multiple separate communication lines for different ceiling equipments are merged into a single shared communication line. The wire harness includes a power source line and a shared communication line that carries signals for multiple equipments (illumination lamps, communication equipment, etc.), thereby reducing the total number of wires in the pillar while maintaining independent control capability through signal multiplexing
Solution Approach 2:
The communication line is designed to serve multiple functions by transmitting control signals for various types of equipments through the same physical medium. The single communication line in the wire harness handles communication with illumination lamps, communication equipment, and other ceiling-mounted devices, making the wire harness a universal interface for all ceiling equipments
2Adaptability or versatility
If more equipments are provided on the ceiling, then vehicle functionality is enhanced, but the space in the pillar becomes insufficient for accommodating additional wires
Solution Approach 1:
The wire harness combines multiple necessary wires (power source line, communication line, ground line) into a single integrated assembly that routes through the pillar. This merging allows the vehicle to support multiple ceiling equipments without proportionally increasing the space required in the pillar, as all connections are bundled into one harness rather than requiring separate wire pathways
Solution Approach 2:
The wire harness is designed as a universal connection system that can accommodate various types of ceiling equipments through its shared communication line. This multi-functional design enables the pillar to support enhanced vehicle functionality with additional equipments without requiring dedicated wire spaces for each device
Data Source
AI summary
An in-vehicle equipment control system includes a wire harness configured to be connected with a power source mounted on a lower side of a vehicle than a ceiling of the vehicle, and provided in an extending manner from the lower side to the ceiling along a pillar of a vehicle body; and a ceiling side controller configured to control an equipment provided at least to the ceiling, the ceiling side controller being provided to the ceiling, electric power of the power source being supplied to the ceiling side controller via the wire harness passing through the pillar.