Trailer Light Connectivity Detection Circuit
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Solution Overview
Problem
Existing systems for trailers lack an efficient method to detect the connection and operational status of lights, particularly turn signals and brake lights, without visible illumination, especially when connected to a towing vehicle, and cannot differentiate between incandescent and LED lights or detect corrosion.
Innovation Solution
A towing vehicle control unit with connectivity and processing circuitry that generates test signals to determine the connection state and load profile of trailer lights, distinguishing between incandescent, LED, and open circuits based on response signal characteristics, and detects corrosion using different current thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If test signals are generated to detect light connection status, then detection capability is improved, but power consumption increases
Solution Approach 1:
The system implements periodic detection by generating test signals at specific intervals (e.g., when ignition is on, during brake application, or at scheduled times) rather than continuously. The control unit receives trigger signals from various vehicle systems (brake, steering, ignition) to initiate detection cycles, thereby reducing overall power consumption while maintaining adequate monitoring frequency for safety
Solution Approach 2:
The system performs preliminary detection by testing light connection status before actual lighting operations are needed. By proactively identifying connection issues through test signals generated during normal vehicle operation (such as when brakes are applied or steering is active), the system prevents failures before they occur during critical moments, reducing the need for repeated detection attempts
2Reliability
If frequent detection is performed, then reliability is improved, but processing load increases
Solution Approach 1:
The detection frequency is made dynamic rather than static. The control unit adjusts detection intervals based on vehicle operating conditions: more frequent detection occurs during critical operations (braking, turning, ignition changes), while less frequent detection occurs during steady-state operation. This dynamic approach maintains high reliability when needed while reducing processing load during normal conditions
Solution Approach 2:
The detection system is segmented into multiple independent detection circuits (left turn signal, right turn signal, brake lights, running lights, reverse lights, fog lights, auxiliary lights, and taillights). Each circuit can be tested independently and in parallel, distributing the processing load across multiple simple binary detection tasks rather than one complex comprehensive analysis, thereby maintaining reliability without overwhelming the processing unit
3Loss of information
If light type differentiation is implemented, then diagnostic capability is improved, but measurement complexity increases
Solution Approach 1:
The system differentiates light types by measuring electrical parameters (current draw, resistance, response time to test signal) rather than attempting to visually or optically identify the light type. Incandescent bulbs exhibit different electrical characteristics (higher current draw, different resistance) compared to LED lights. By converting the identification problem from optical/visual domain to electrical measurement domain, the system simplifies the measurement process while maintaining accurate light type differentiation
Solution Approach 2:
The system replaces complex optical or visual detection methods with simple electrical measurements. Instead of using cameras, sensors, or visual inspection to identify light types, the control unit uses the existing electrical connection circuits to measure current, resistance, and response characteristics. This substitution of measurement methodology dramatically reduces measurement complexity while preserving the ability to distinguish between incandescent and LED light types
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, non-invasive detection of light connectivity and type without illuminating the lights, promptly identifying disconnections and corrosion, ensuring safe and operational trailer lighting.
Implementation Method 1
the processing circuitry determines the connection state and the load profile of the lamps of the trailer based on a timing characteristic of a response signal
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.