Trailer Light Connectivity Detection Using Periodic Test Signals
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Solution Overview
Problem
Existing systems lack an efficient method to determine the connection status and type of lights on a trailer without visible illumination, posing challenges for safety and operational efficiency.
Innovation Solution
A towing vehicle equipped with a towing control unit that includes circuitry to detect light connections by generating test signals and analyzing response signals, distinguishing between incandescent, LED, and open circuit conditions based on timing characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If test signals are generated frequently to detect light connection status, then detection speed and safety are improved, but energy consumption increases
Solution Approach 1:
The system implements periodic testing at configured intervals rather than continuous testing, allowing the vehicle to detect light connection status reliably while consuming energy only during test cycles. The controller can be configured to test at specific intervals or under specific conditions, balancing detection reliability with energy conservation.
Solution Approach 2:
The system changes testing parameters dynamically based on vehicle state. Testing frequency and signal characteristics are adjusted according to whether the vehicle is moving, parked, or in different operational modes, reducing energy consumption during low-risk periods while maintaining high detection reliability when needed.
2Measurement precision
If the towing control unit continuously monitors light status, then detection accuracy is improved, but computational resources are consumed
Solution Approach 1:
The system extracts only the essential information needed for light status detection from the complex electrical signals. By focusing on specific electrical characteristics (voltage levels, current flow patterns, resistance values) rather than analyzing all possible signal parameters, the system achieves high detection precision with simplified processing logic.
3Loss of information
If the system distinguishes between different light types (incandescent, LED, open circuit), then diagnostic capability is improved, but detection complexity increases
Solution Approach 1:
The system replaces complex visual inspection or manual testing with automated electrical measurements. By using electrical characteristics (current draw, voltage response, resistance) to identify light types, the system achieves accurate differentiation between incandescent, LED, and open circuit conditions through simple electrical tests rather than complex diagnostic procedures.
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
Enables frequent and accurate detection of light connection states and types without illuminating the lights, improving safety and operational efficiency by ensuring proper lighting functionality and detecting potential issues like corrosion.
Implementation Method 1
the corresponding connectivity circuit periodically (e.g., every 20 millisecond (ms), every 100 ms, every 250 ms, etc.) generates a test signal. Based on characteristics of a response signal to the test signal, the connectivity circuit (or, in some examples, processing circuitry coupled to the connectivity circuitry) determines whether the corresponding turn signal light and/or braking light of the trailer is connected.
Data Source
AI summary
A towing vehicle includes a towing control unit with circuitry to detect whether a light is connected to the electrical harness electrically coupling the vehicle to the trailer. The towing control unit may include lamp connectivity circuits for, for example, the left turn signal and the right turn signal. To determine whether the turn light is connected, the corresponding connectivity circuit periodically generates a test signal. Based on characteristics of a response signal to the test signal. The connectivity circuit determines whether the corresponding turn signal light of the trailer is connected based on a response to the test signal. The connectivity circuit may distinguished whether an incandescent-based turn signal light, a light emitting diode (LED)-based turn signal light, and an open circuit is sensed based on the characteristics of the response signal.