Vehicle Lighting Harness Routing for EMI Reduction
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Solution Overview
Problem
Motor vehicle lighting devices face challenges in meeting electromagnetic wave emission thresholds, aesthetic requirements, operational modes, and size constraints, while existing solutions often complicate implementation and fail to optimize these factors simultaneously.
Innovation Solution
A lighting device design featuring a housing with an electromagnetic shielding cage, a printed circuit with light-emitting diodes, and an electrical harness routed in a configuration that avoids intersecting the shielding cage, guided by ribs within the housing, along with a method for mounting that includes manufacturing and positioning the harness between ribs and edges of the casing to optimize space and emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the electrical harness is routed close to the electromagnetic shielding cage to minimize space, then the device size is reduced, but electromagnetic interference increases causing malfunctions in other equipment
Solution Approach 1:
The electrical harness is extracted from the immediate vicinity of the electromagnetic shielding cage and routed through a dedicated channel in the housing that separates it from the cage. This spatial extraction eliminates the harmful electromagnetic interference while maintaining compact overall device dimensions through optimized routing paths.
2Object-generated harmful factors
If the electrical harness is routed away from the electromagnetic shielding cage to reduce electromagnetic interference, then electromagnetic compatibility is improved, but the device volume increases
Solution Approach 1:
Instead of routing the electrical harness in a straight line perpendicular to the shielding cage, the harness is routed through a third dimension by utilizing the housing depth and side walls. The harness enters the housing through a side wall, travels along the housing interior surface, and connects to the circuit board, effectively using the housing's three-dimensional space to separate the harness from the cage without increasing the device's external footprint.
3Adaptability or versatility
If multiple lighting modes are implemented with multiple light sources, then the lighting system's versatility is improved, but the device complexity and space requirements increase
Solution Approach 1:
Multiple light-emitting diodes are mounted on a single circuit board within the housing, with each LED capable of being independently controlled to provide different lighting modes (position light, daytime running light, main beam, fog light). This multi-functional approach allows a single lighting device to perform multiple functions that would traditionally require separate lighting components, thereby reducing overall system complexity while maintaining versatility.
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 allows for efficient electromagnetic wave emission compliance, multiple lighting modes, and compact size, ensuring the lighting device integrates seamlessly into vehicles without disrupting other electrical components, while maintaining moderate costs.
Implementation Method 1
a printed circuit board with at least one light-emitting diode, in particular an LED type light source, and equipped with an electromagnetic shielding cage
Implementation Method 2
a printed circuit board with at least one light-emitting diode, in particular an LED type light source
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Lighting device (11) for a motor vehicle (1), comprising: - a housing (6), - a printed circuit board (22) equipped with at least one light source (23) of the type light-emitting diode, and equipped with an electromagnetic shielding cage (29), the printed circuit board (22) extending along a printed circuit board plane (YZ) and being fixed inside the housing (6), - an electrical harness (26) fixed at one end to the printed circuit board (22) and fixed at a second end to the housing (6), characterized in that the electrical harness (26) includes a path whose projection along an axis perpendicular (X) to the printed circuit board plane (YZ) does not intersect the projection of the cage (29) along the axis perpendicular (X) to the printed circuit board plane (YZ) and in that the electrical harness (26) includes a portion extending parallel to a lateral edge (30d) of the cage (29).