Rear Lamp Control Using Initiation Pulses for Emergency Flashing
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Solution Overview
Problem
Existing methods for controlling rear lamps in vehicles fail to efficiently switch between sequential and flashing modes during emergency signals, leading to potential delays and misinterpretation of power feed line disturbances, which compromises road safety.
Innovation Solution
A method involving the transmission of initiation pulses with durations shorter than emergency feed pulses on the power feed line to control devices, allowing for rapid and reliable switching between sequential and flashing modes without additional cables, ensuring compliance with legal requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sequential activation mode is used for DI lamp, then the lamp shows clear direction indication, but the lamp cannot provide simultaneous flashing required for emergency signals
Solution Approach 1:
The control device dynamically switches between sequential activation mode and simultaneous flashing mode based on the type of signal received. The system transitions from a fixed sequential mode to an adaptive mode that can respond to different signal types (normal DI vs. emergency signals), ensuring both clear direction indication and reliable emergency signaling
Solution Approach 2:
The system changes the activation parameter of the lamp elements from sequential timing to simultaneous activation when emergency signals are detected. By modifying the temporal parameter of element activation based on signal type, the system achieves both clear directional indication in normal mode and reliable simultaneous flashing in emergency mode
2Reliability
If conventional pulse transmission is used on power feed line, then existing installations can be reused, but disturbances on the power feed line may be misinterpreted as activation signals
Solution Approach 1:
The invention uses asymmetric pulse duration characteristics to distinguish activation signals from disturbances. By transmitting initiation pulses with a specific duration that is shorter than the duration of normal operation pulses, and combining this with a mandatory non-pulse period, the system creates an asymmetric signal pattern that is easily distinguishable from random power line disturbances, thereby improving signal reliability without requiring additional cables
3Reliability
If additional control cables are installed for emergency signal transmission, then signal transmission reliability improves, but device complexity and installation cost increase
Solution Approach 1:
The power feed line is designed to serve multiple functions: it provides both power supply and control signal transmission for the DI lamp. By making the power feed line universal and capable of carrying both normal operation pulses and emergency signal initiation pulses, the system eliminates the need for separate control cables, reducing device complexity and installation cost while maintaining reliable emergency signal transmission
Solution Approach 2:
The invention merges the power supply function and control signal transmission function into a single power feed line. By combining these two functions that were traditionally separated into different cables, the system achieves cost-effective installation while maintaining the reliability needed for emergency signal transmission
Data Source
AI summary
The invention relates to a method, a control arrangement, and a control device for controlling a rear lamp in a vehicle. The rear lamp is operated in an emergency signal mode when it is determined that an emergency signal event has occurred and based on one or more first initiation pulses associated with the emergency signal event transmitted to the control device from the control arrangement, wherein a duration of each of the one or more first initiation pulses is shorter than a duration of an emergency feed pulse. The invention also relates to a rear lamp, a vehicle, a computer program, and a computer-readable medium.