Vehicular Lamp Control Device Pitch Angle Calculation
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Solution Overview
Problem
Existing techniques for automatic leveling control of vehicular lamps fail to accurately account for gravitational acceleration components, leading to low accuracy in calculating the vehicle's attitude in the pitch direction.
Innovation Solution
A vehicular lamp system that includes an acceleration sensor capable of detecting orthogonal axes, a control part with an angle calculation and optical axis setting component, which eliminates gravitational acceleration components from sensor outputs to accurately calculate the vehicle's pitch angle and adjust the optical axis accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gravitational acceleration components are not eliminated from acceleration sensor outputs, then the calculation process is simpler, but the accuracy of vehicle attitude calculation deteriorates
Solution Approach 1:
The patent extracts and eliminates the gravitational acceleration components from the total acceleration sensor outputs. By separating the gravitational component (which is constant or slowly varying) from the dynamic acceleration component, the system achieves accurate vehicle attitude calculation while maintaining manageable processing complexity through systematic elimination of the disturbing gravitational factor.
Solution Approach 2:
The patent employs feedback mechanisms where the calculated vehicle attitude information is used to determine and eliminate gravitational acceleration components, which are then subtracted from the original sensor outputs. This iterative feedback process refines the accuracy of attitude calculation by continuously improving the separation of gravitational and dynamic acceleration components.
2Manufacturing precision
If gravitational acceleration components are not taken into consideration, then the control system is simpler, but the accuracy of optical axis adjustment deteriorates
Solution Approach 1:
The control system extracts and eliminates gravitational acceleration components from sensor outputs before using the data for optical axis adjustment. This extraction process removes the disturbing gravitational factor, enabling precise optical axis alignment while keeping the control system structure manageable through systematic data processing.
Solution Approach 2:
The patent introduces an intermediary processing step where gravitational acceleration components are calculated and eliminated as a intermediate stage between raw sensor data and optical axis control commands. This intermediary process acts as a mediator that transforms imperfect raw data into refined control signals, improving adjustment accuracy without requiring direct complex control mechanisms.
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 achieves more accurate control of light irradiation direction by isolating gravitational components from acceleration data, improving the calculation of the vehicle's attitude and reducing errors in optical axis adjustment.
Implementation Method 1
The accelerations obtained by the acceleration sensor installed in the vehicle also includes gravitational acceleration components
Data Source
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Figure 3A~4
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AI summary
To provide a technique capable of accurately obtaining the attitude of a vehicle in the pitch direction. A control device (11) for a vehicular lamp (13) which controls the optical axis of a vehicular lamp in accordance with an attitude change in pitch direction of the vehicle is disclosed. The device includes an angle calculation part (20) which obtains a first and a second acceleration by eliminating the gravitational acceleration component from each acceleration in the vertical and the longitudinal direction of the vehicle, calculates a vehicle traveling direction acceleration based on the accelerations, and obtains a vehicle attitude angle based on the correlation between the vehicle traveling direction acceleration and the first and the second accelerations. The angle calculation part (20) obtains the attitude angle of the vehicle when it determines that the vehicle is accelerating or decelerating based on the determination on the basis of each acceleration difference at the predetermined time.