Vehicular Lamp Assembly UWB Timing to Avoid EMI Noise
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Solution Overview
Problem
The integration of short-range wireless communication antennae with vehicular lamp assemblies leads to electromagnetic interference (EMI) that disrupts wireless communications, particularly when the lamp assemblies are electrically operated to emit light, posing challenges in packaging and increasing wire harness complexity.
Innovation Solution
The lamp assemblies are equipped with a control module that synchronizes the operation of the light source and UWB antenna using a duty cycle, transmitting wireless communications during the off-cycle of the light source's operation to avoid EMI interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the antenna is positioned at the lamp assembly to reduce wire harness complexity and improve packaging, then device complexity is reduced, but electromagnetic interference from the lamp assembly affects wireless communication reliability
Solution Approach 1:
The system uses periodic duty cycling to alternately energize the light source and transmit wireless communications. The controller transmits outgoing communications during off-cycles when the light source is not energized, and receives incoming communications during on-cycles when the light source is energized. This periodic action eliminates EMI interference while maintaining both lighting and communication functions at the integrated lamp assembly location.
2Illumination intensity
If the lamp assembly is energized to emit light, then illumination function is performed, but electromagnetic interference disrupts wireless communication signals
Solution Approach 1:
The controller implements duty cycling that periodically energizes the light source and alternates with wireless communication transmission. By scheduling communications during off-cycles when the light source is de-energized, the system eliminates EMI interference while maintaining both functions over time. This periodic separation ensures that harmful electromagnetic effects do not occur during critical communication windows.
Solution Approach 2:
The controller proactively schedules wireless communication transmission during predicted off-cycles of the light source duty cycle. By anticipating when EMI will be absent, the system preliminarily positions communication activities in time slots free from interference, ensuring reliable transmission before attempting actual data exchange.
Data Source
AI summary
A method includes energizing a light source of a vehicular lamp assembly according to a duty cycle. The light source emits light responsive to being energized. While energizing the light source, and during an off-cycle of the duty cycle, the method includes transmitting an outgoing short-range wireless communication to a user device. The outgoing short-range wireless communication is transmitted from an antenna at the vehicular lamp assembly. During the off-cycle of the duty cycle, the method includes receiving an incoming short-range wireless communication at the antenna at the vehicular lamp assembly. The incoming short-range wireless communication is transmitted from the user device responsive to the outgoing short-range wireless communication.