Vehicle Headlight Control via Field Bus Characteristic Values
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Solution Overview
Problem
Existing lighting arrangements for motor vehicles with adaptive front lighting systems face challenges in avoiding sudden changes in headlight power, which can be annoying to drivers, while also requiring a large amount of information to be transmitted continuously for smooth adjustments.
Innovation Solution
The control and/or regulating device determines characteristic values for a time profile of desired headlight power settings and transmits these via a field bus interface, allowing the headlight to adjust power accordingly, minimizing information transmission and avoiding sudden changes by using interpolation points or functional parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If discrete target values are transmitted to control headlight power, then information transmission amount is kept small, but sudden changes in headlight power occur causing driver annoyance
Solution Approach 1:
The control device pre-calculates and transmits characteristic values for the entire time profile of desired headlight power settings, rather than transmitting individual discrete target values at each moment. This preliminary action allows the headlight control unit to reconstruct a smooth continuous curve locally, avoiding sudden jumps while minimizing overall data transmission.
Solution Approach 2:
The system changes the parameter representation from discrete target power values to characteristic values defining a time profile curve. By transmitting parameters that describe the curve's shape and key points rather than every individual power setting, the system reduces data transmission while enabling smooth continuous power adjustment.
2Ease of operation
If continuous target values are transmitted to avoid sudden changes, then driver comfort is improved, but information transmission amount increases
Solution Approach 1:
The system extracts only the essential characteristic values needed to define the time profile curve, rather than transmitting the complete continuous target value sequence. By taking out only the critical parameters (such as key points, curve shape descriptors, or functional coefficients), the system maintains smooth power transitions while significantly reducing data transmission requirements.
Solution Approach 2:
The control device performs preliminary computation to determine the optimal set of characteristic values that will generate the desired smooth power profile when reconstructed by the headlight control unit. This pre-processing extracts the minimal necessary information upfront, avoiding the need to transmit continuous data streams.
3Loss of information
If characteristic values for time profile are used, then information transmission is minimized and smooth power changes are achieved, but device complexity increases
Solution Approach 1:
The system introduces characteristic values as an intermediary representation between the control device and headlight control unit. These characteristic values serve as a compact mediator that encapsulates the essential information needed for smooth power transitions without requiring complex continuous data streams, simplifying the communication interface while maintaining control sophistication.
Data Source
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AI summary
The arrangement has a control unit (1) connected with a headlight (2a,2b) over a field bus (3) for information exchange. The control unit is equipped for determining characteristic values for a process of reference value and transferring the characteristic values to the bus over an interface. The headlight is equipped to take the characteristic values over an interface of the bus for determining reference value and positioning the power output according to the reference value. The field bus is a Local interconnect network busand Controller area network bus.