Vehicle Lamp Optical Axis Control Using Acceleration Ratio Sensing
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Solution Overview
Problem
Existing auto-leveling systems for vehicle lamps rely on vehicle height sensors, which are costly and do not accurately distinguish between vehicle inclination relative to the road surface and road surface inclination, leading to suboptimal lighting adjustments.
Innovation Solution
A vehicle lamp system utilizing an acceleration sensor to derive vehicle longitudinal and vertical direction accelerations, calculating the ratio of their temporal changes during acceleration or deceleration to adjust the optical axis of the vehicle lamp, thereby accurately determining the vehicle's attitude angle relative to the road surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a vehicle height sensor is used for auto-leveling control, then the optical axis position can be adjusted according to vehicle inclination, but the system becomes costly and cannot accurately distinguish between road surface inclination and vehicle attitude changes
Solution Approach 1:
The invention extracts only the necessary information (vehicle attitude angle) from the acceleration sensor data by analyzing temporal changes during acceleration/deceleration, rather than using a complex vehicle height sensor system. This separates the essential measurement function from unnecessary system complexity.
Solution Approach 2:
The invention replaces the mechanical vehicle height sensor system with an acceleration sensor-based computational approach. By using temporal change analysis of acceleration data during vehicle acceleration/deceleration, the system substitutes complex mechanical sensing with simpler electronic sensing and signal processing.
2Device complexity
If an acceleration sensor is used to detect vehicle inclination, then the system cost and weight are reduced, but the system cannot distinguish between road surface inclination and vehicle attitude angle
Solution Approach 1:
The invention performs preliminary analysis of acceleration data during vehicle acceleration/deceleration phases to establish the relationship between temporal changes in acceleration and vehicle attitude. By capturing data during these specific phases, the system prepares the necessary information for accurate attitude angle calculation.
Solution Approach 2:
The system uses feedback from the temporal change rates of acceleration data to continuously refine the vehicle attitude angle calculation. By monitoring how acceleration changes over time during vehicle maneuvers, the system adjusts its interpretation of the acceleration sensor data to accurately determine vehicle attitude.
3Reliability
If the optical axis is adjusted based on inaccurate inclination data, then the forward irradiation distance becomes suboptimal, but using more accurate sensors increases system cost
Solution Approach 1:
The acceleration sensor serves multiple functions: it detects both vehicle acceleration/deceleration and the resulting attitude changes. By utilizing the same sensor for both motion detection and attitude measurement, the system achieves reliable lighting adjustment without adding separate sensors, thereby maintaining cost-effectiveness.
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
This approach enables precise auto-leveling control, maintaining optimal forward irradiation distance by accurately adjusting the optical axis based on vehicle attitude changes, reducing control burden and extending actuator life while ensuring high accuracy and reliability.
Implementation Method 1
an acceleration sensor, and the controller receives acceleration information from the acceleration sensor
Data Source
AI summary
A vehicle lamp controller, a vehicle lamp system, and a vehicle lamp control method are provided. The vehicle lamp system includes an acceleration sensor, a vehicle lamp, and the vehicle controller. The controller includes a receiver configured to receive an acceleration information detected by the acceleration sensor, a control unit configured to derive a vehicle longitudinal direction acceleration and a vehicle vertical direction acceleration from the acceleration information, and to generate a control signal for instructing an adjustment of an optical axis of the vehicle lamp, based on a variation in a ratio between a temporal change amount of the vehicle longitudinal direction acceleration and a temporal change amount of the vehicle vertical direction acceleration during at least one of an acceleration and a deceleration of a vehicle, and a transmitter configured to transmit the control signal to an optical axis adjusting portion of the vehicle lamp.