Truck Headlight Adapter Circuit Resolving Diagnostic Load Mismatch
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Solution Overview
Problem
The onboard diagnostic system of certain trucks fails to read sufficient load resistance from LED headlights, leading to false diagnostics and limited functionality of the lighting system when replacing stock headlights with new LED lights.
Innovation Solution
A headlight adapter is developed that integrates transistors and resistors to mimic the load resistance and switching functions of OEM truck headlights, ensuring compatibility and bypassing diagnostic system limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LED headlights are installed to replace stock headlights, then energy efficiency and lifespan are improved, but the onboard diagnostic system detects insufficient load resistance and limits lighting system functionality
Solution Approach 1:
The patent introduces an intermediary device (headlight adapter or resistive load simulator) that mediates between the LED headlights and the truck's diagnostic system. This intermediary component provides the necessary load resistance to satisfy the diagnostic system's expectations while allowing the LED headlights to function efficiently, thus resolving the contradiction between energy efficiency and diagnostic system compatibility.
Solution Approach 2:
The patent changes the electrical parameters (specifically adding resistive load) to match the expectations of the diagnostic system. By adjusting the circuit parameters through adaptive load management, the system maintains compatibility with the diagnostic system while preserving the energy-efficient operation of LED headlights.
2Loss of energy
If LED headlights are installed to replace stock headlights, then operational costs are reduced, but false diagnostic alerts are generated and functionality is limited
Solution Approach 1:
The headlight adapter serves as an intermediary that prevents false diagnostic alerts from limiting lighting system functionality. It maintains proper load resistance levels to satisfy the diagnostic system while allowing LED headlights to operate at full capacity, thus preserving ease of operation while maintaining energy efficiency benefits.
3Use of energy by moving object
If LED headlights with low draw are used, then energy consumption is reduced, but the diagnostic system cannot read sufficient load resistance
Solution Approach 1:
The patent introduces a resistive load simulator or headlight adapter as an intermediary component that provides the necessary load resistance for the diagnostic system to read accurately. This intermediary device does not significantly increase overall energy consumption while ensuring the diagnostic system receives sufficient load resistance signals for proper measurement and operation.
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 adapter effectively circumvents diagnostic system errors by simulating the load resistance and switching functions of OEM headlights, allowing full functionality of LED headlights while avoiding false diagnostic alerts.
Implementation Method 1
The transistor is turned 'on' via the capacitor being discharged
Implementation Method 2
for a time constant set by the capacitor and resistor 'R2'
Implementation Method 3
A load resistor adds a load to circuit 'E' to match the expected current from an OEM truck headlight
Data Source
AI summary
In replacing stock headlights on certain trucks with new Light Emitting Diode (LED) lights, the onboard diagnostic system of the trucks do not read sufficient load resistance from the new lights and so the diagnostic system indicates that there is an issue with the lighting system and consequently limits the functionality of the lighting system. The present application seeks to provide a solution to this problem by creating a headlight adapter that integrates components for imitating the load resistance and switching functions of Original Equipment Manufacturer (OEM) truck headlights (the “Headlight Adapter ”).