Vehicle Safety Lighting Deceleration Detection
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Solution Overview
Problem
Existing vehicle brake lights only warn drivers of deceleration caused by the operator applying the brakes, failing to alert drivers to deceleration from other causes like engine braking or downshifting, which can lead to unsafe situations due to false indications from multi-axial acceleration measurements.
Innovation Solution
A vehicle safety lighting system that includes a multi-axis accelerometer and a controller unit to detect deceleration along multiple axes, filtering out noise and false alarms, and activating brake lights in a sequential pattern based on deceleration thresholds, regardless of the cause of deceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-axial acceleration measurements are used to detect vehicle deceleration, then the system can detect deceleration from any cause including engine braking and downshifting, but false indications occur when the vehicle is leaning into a turn or encountering changes in road grade
Solution Approach 1:
The patent segments the deceleration detection by analyzing individual axis measurements separately rather than using total multi-axial acceleration. The controller evaluates deceleration along the vehicle's longitudinal axis independently, filtering out lateral acceleration components that cause false alarms during turns or when encountering road grade changes.
Solution Approach 2:
The patent introduces a controller unit as an intermediary that processes raw accelerometer data and applies logic to distinguish true deceleration events from false indications. The controller mediates between the accelerometer output and brake light activation, using threshold comparisons and axis-specific analysis to prevent false alarms while maintaining reliable detection.
2Reliability
If brake lights are activated only by manual brake application, then false indications are minimized, but drivers behind the vehicle receive no warning of deceleration from other causes such as engine braking or downshifting
Solution Approach 1:
The patent makes the brake light system universal by enabling it to respond to multiple types of deceleration events regardless of cause. The system functions both as a traditional brake light indicator and as a general deceleration warning system, activating in response to engine braking, downshifting, or any other deceleration mechanism through the accelerometer-based detection.
3Productivity
If acceleration sensing devices are used to detect vehicle deceleration independently of brake operation, then deceleration warnings are provided for all causes, but false indications occur during turning or road grade changes
Solution Approach 1:
The patent applies local quality by focusing the deceleration detection specifically on the longitudinal axis of the vehicle rather than considering all acceleration vectors equally. This localized measurement approach ensures that only deceleration relevant to forward motion is detected, while excluding lateral movements during turns or vertical movements during road grade changes.
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 system effectively alerts drivers to vehicle deceleration from any cause, reducing the risk of accidents by providing accurate deceleration warnings and minimizing false alarms from events like turning or road grade changes.
Implementation Method 1
a multi-axis accelerometer, mechanically coupled to the vehicle, configured to detect acceleration of the vehicle along each of a plurality of axes
Data Source
AI summary
Methods and systems for vehicle safety lighting are disclosed, including a system having a multi-axis accelerometer that detects acceleration of the vehicle along a first axis and a second axis normal to the first axis, and outputs a corresponding first axis acceleration measurement and a second axis acceleration measurement. A controller is coupled to the multi-axis accelerometer, and to an array of light emitter elements (LELs). The controller is configured to determine a vehicle deceleration, based at least in part on a combination of the first axis acceleration measurement and second axis acceleration measurement, and to detect the vehicle deceleration exceeding a brake light threshold and, based at least in part on the detection, output a deceleration light signal to the array of LELs. Digital filtering prevents operation of the safety lighting by accelerometer outputs unrelated to axial deceleration, such as will occur upon encountering a hill, or, in the case of a motorcycle or the like, leaning into a turn.