Vehicle Inclination Angle Detection with Stationary Reference Correction
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Solution Overview
Problem
Existing vehicle inclination angle detection systems face errors due to noise accumulation from vehicle mechanisms during changes in load, such as passengers getting in or out, or luggage being loaded/unloaded, which affect the accuracy of optical axis adjustment for headlights.
Innovation Solution
An inclination angle detection apparatus that calculates the vehicle's inclination angle during stationary periods and uses a correction determination processing unit to compare this angle with a reference angle, correcting it if the difference is within a certain threshold, thereby suppressing detection errors caused by noise accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If inclination angle detection is performed continuously during vehicle operation, then real-time optical axis adjustment is achieved, but noise accumulation from vehicle mechanisms causes detection errors to deviate from correct inclination angles
Solution Approach 1:
The system performs preliminary inclination angle detection during stationary periods before actual vehicle operation, establishing a baseline reference angle. This preliminary action allows the system to later compare dynamic detection results against this pre-established reference, filtering out noise accumulation effects while maintaining real-time adjustment capability.
Solution Approach 2:
The system continuously compares detected inclination angles with the reference angle obtained during stationary periods, and adjusts the optical axis based on this feedback. When the vehicle returns to a stationary state, the system updates the reference angle, creating a closed-loop feedback mechanism that eliminates noise accumulation errors while maintaining responsive adjustment.
2Adaptability or versatility
If optical axis adjustment is performed during non-static load changes (brake shift, parking brake, gear shift), then real-time adaptation to load changes is achieved, but detection errors occur because these changes are not caused by vehicle inclination
Solution Approach 1:
The system extracts and isolates the true inclination angle component from the total detected signal by comparing against reference angles obtained during stationary periods. This separation allows the system to identify and exclude false signals caused by non-static load changes such as brake operations and gear shifts, maintaining detection accuracy while preserving adaptability to genuine inclination changes.
3Adaptability or versatility
If the vehicle inclination angle is continuously updated during operation, then the system adapts to changing conditions, but noise accumulation causes the detection result to deviate from the correct inclination angle
Solution Approach 1:
The system establishes a reference inclination angle during stationary periods before operation begins. This preliminary measurement serves as a stable baseline that filters out subsequent noise accumulation during dynamic operation, allowing the system to maintain adaptability to genuine load changes while preventing deviation from correct inclination angles.
Solution Approach 2:
The system implements a feedback mechanism where detected inclination angles are continuously compared against the reference angle. When the vehicle returns to a stationary state, the reference angle is updated with the new measurement, creating a self-correcting system that maintains both adaptability and precision over time.
Data Source
AI summary
Provided are: an inclination angle calculating unit for calculating, when having determined that a vehicle is stationary by referring to vehicle information indicating a traveling state of the vehicle, an inclination angle of the vehicle during a stationary period using inclination angle information indicating an inclination angle of the vehicle and determining a vehicle inclination angle during the stationary period from the calculated inclination angle of the vehicle; and a correction determination processing unit for determining whether an absolute value of a difference between the determined vehicle inclination angle and a reference angle determined previously by the inclination angle calculating unit is less than a first threshold value (threshold value α) and, if the absolute value of the difference is less than the first threshold value (threshold value α), performing a correction to rewrite the vehicle inclination angle to the reference angle.