Brake Light Current Modulation That Avoids Vehicle Fault Warnings
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Solution Overview
Problem
Existing stop lamp modulation devices do not function properly with modern vehicles equipped with fault detection circuitry, leading to false warnings and potential suspension of brake light operation.
Innovation Solution
A brake light modulation device that measures current in the brake light circuit, maintains a constant input current, and uses pulse-width modulation to vary the output voltage, ensuring compatibility with various vehicles and avoiding fault detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If stop lamp modulation devices vary the current across the brake light, then the brake light modulation function is achieved, but the fault detection circuitry improperly detects a problem with the brake light
Solution Approach 1:
The patent applies periodic action by modulating the brake light current in a periodic waveform pattern. The controller varies the current through the brake light in repeated cycles, creating the flashing effect needed for attention-grabbing functionality while maintaining systematic control over the modulation process.
Solution Approach 2:
The patent implements feedback by using a current sensor to monitor the actual current flowing through the brake light and feeding this information back to the controller. The controller adjusts the modulation waveform based on this feedback to maintain the desired current variation pattern while ensuring compatibility with vehicle fault detection systems.
2Productivity
If stop lamp modulation devices are installed in existing vehicles, then the attention-grabbing function is added, but the device complexity and installation difficulty increase
Solution Approach 1:
The patent applies universality by designing a modulation device that can be installed in multiple types of vehicles with different brake light systems. The device incorporates universal mounting provisions and adapts to various electrical configurations, allowing it to function across different vehicle platforms without requiring vehicle-specific customization.
Solution Approach 2:
The patent implements segmentation by dividing the modulation device into separate functional modules: a controller unit, a current sensor, and mounting components. This modular approach simplifies installation and allows the device to be adapted to different vehicle configurations by connecting to appropriate circuit points.
3Speed
If the brake light current is modulated rapidly, then the flashing effect is achieved, but the fault detection circuitry cannot distinguish between modulation and actual faults
Solution Approach 1:
The patent applies dynamics by implementing a controller that can dynamically adjust the modulation parameters including frequency, amplitude, and waveform shape. This allows the system to optimize the flashing effect for attention-grabbing functionality while varying the modulation characteristics to avoid triggering fault detection thresholds in different vehicle systems.
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 device provides effective brake light modulation without triggering fault warnings, maintaining attention-grabbing functionality across different vehicle models while minimizing heat buildup and power consumption.
Implementation Method 1
uses pulse-width modulation to vary the output voltage
Data Source
AI summary
A brake light detection device includes an output transistor arranged in an output path and a shunt transistor arranged in a shunt path. The brake light modulation device further includes a controller configured to receive a current signal from an input current detector and provide control signals to the output transistor and the shunt transistor. The control signals are configured to (i) modulate an output current delivered through to the output path during a vehicle braking event and (ii) maintain the magnitude of the current applied to the input line such that the magnitude of the current applied to the input line remains constant during the vehicle braking event. Modulation of the output current includes on-intervals and off-intervals. The controller is further configured to control the shunt transistor and the output transistor to sub-modulate the output current during the off-intervals.