Trailer Camera Wiring Harness for Low-Latency Video Transmission
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Solution Overview
Problem
Commercial truck camera monitoring systems face challenges in providing visibility behind the trailer due to blind spots, and existing solutions require costly dedicated wiring for transmitting video signals with minimal latency.
Innovation Solution
A camera monitoring system that uses a trailer-mounted sensor to transmit signals over common wiring harness wires, including power and ground wires, with processors and filters to embed and isolate the sensor signal within control signals, allowing for high-speed transmission without dedicated wiring, reducing noise and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated wiring is used to transmit video signals from trailer-mounted cameras, then signal transmission reliability is improved, but system complexity and installation cost increase
Solution Approach 1:
The patent combines video signal transmission with existing power and control wiring by superimposing video signals onto power lines. The camera's video output is connected to the power wire through a coupling mechanism, allowing both power delivery and video transmission through the same physical medium, thereby eliminating dedicated video wiring
Solution Approach 2:
The existing power and control wires in the trailer wiring harness are made multi-functional by enabling them to carry both their original electrical functions and video signal transmission. This universal usage of wiring infrastructure reduces the need for additional dedicated video cables
2Ease of manufacture
If common wiring harness wires are used for signal transmission, then installation cost and complexity are reduced, but noise interference from trailer components increases
Solution Approach 1:
The patent introduces an intermediary coupling mechanism between the camera output and the power wire that allows video signals to be superimposed onto the power line while isolating the camera from direct electrical interference. This coupling acts as a mediator that enables signal transmission while protecting against noise
Solution Approach 2:
The patent converts the potentially harmful noise environment into a beneficial situation by using the existing power and control wires as transmission medium. The high-frequency video signals are superimposed on the power lines in a way that the existing electrical infrastructure actually helps with signal transmission while filters naturally attenuate certain frequency ranges
3Loss of time
If high-speed signal transmission is achieved over common wires, then latency is reduced, but signal noise from trailer components worsens
Solution Approach 1:
The patent employs periodic modulation techniques where video signals are transmitted in periodic bursts or modulated onto the power line at specific frequencies. This periodic action allows the signal to be transmitted efficiently over the common wiring while the rhythmic nature of the transmission helps in noise filtering and signal recovery
Solution Approach 2:
The patent changes the electrical parameters of the transmission medium by superimposing high-frequency video signals onto the lower-frequency power lines. This parameter transformation allows the existing wiring to carry video signals at high speeds while the frequency difference acts as a natural filter against low-frequency electrical noise from trailer components
Data Source
AI summary
A camera monitoring system has a trailer with trailer components that are responsive to at least one control signal and a wiring harness that is in communication with the trailer components and has a connector that communicates with a tractor. The wiring harness carries the at least one control signal to the trailer components. A sensor is provided on the trailer and generates a sensor signal. A processor is interconnected between the sensor and the wiring harness. The processor transforms the sensor signal for transmission over the wiring harness with the at least one control signal using common wires within the wiring harness. A filter is interconnected between the processor and at least one of the trailer components to filter noise from the at least one control signal.