Vehicle Lamp Auto-Leveling Control Device Timing Strategy
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Solution Overview
Problem
Existing auto leveling control systems for vehicle lamp devices lack precision when using acceleration sensors, leading to suboptimal adjustment of headlight illumination direction with vehicle posture changes.
Innovation Solution
A control device that receives output values from an acceleration sensor to deduce the vehicle's inclined angle and change in angle, using a timing determination unit to drive an actuator based on the number of output values, and plots these values to calculate the optical axis angle, thereby improving precision in auto leveling control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If acceleration sensor is used for auto leveling control, then cost and weight are reduced, but measurement precision deteriorates
Solution Approach 1:
The control device collects acceleration sensor output values before actuator driving and stores them in advance. By preliminarily acquiring and storing multiple output values (first number when vehicle speed is low, second number when vehicle speed is high), the system prepares sufficient data for accurate inclined angle deduction before control action is needed, thereby improving measurement precision without requiring complex real-time processing systems
Solution Approach 2:
The control device changes the number of acceleration sensor output values to be acquired based on vehicle speed conditions. When vehicle speed is below a predetermined value, it acquires the first number of output values; when vehicle speed is equal to or above the predetermined value, it acquires the second number of output values. This parameter change adapts the data collection process to different operating conditions, improving measurement precision while maintaining system simplicity
2Measurement precision
If vehicle speed-based timing determination is implemented, then measurement precision is improved, but control complexity increases
Solution Approach 1:
The control device dynamically adjusts the number of acceleration sensor output values to be acquired based on vehicle speed conditions. The timing determination unit determines different acquisition counts (first number or second number) according to whether vehicle speed is below or above a predetermined threshold. This dynamic adaptation improves measurement precision by optimizing data collection for different operating conditions while using simple speed-based logic rather than complex algorithms
Solution Approach 2:
The control process is segmented into different timing conditions based on vehicle speed. The timing determination unit divides the control operation into at least two timing patterns: one for when vehicle speed is below the predetermined value and another for when vehicle speed is equal to or above the predetermined value. This segmentation allows precise control adapted to different driving conditions without requiring overly complex unified control logic
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
Enhances the precision of auto leveling control by accurately adjusting the optical axis of vehicle lamps in response to changes in vehicle posture, ensuring optimal illumination distance and direction.
Implementation Method 1
an acceleration sensor configured to detect an acceleration of the vehicle in an upper-lower direction of the vehicle
Implementation Method 2
The control unit may be configured to plot the output values of the acceleration sensor on coordinates in which the acceleration in the front-rear direction of the vehicle is set on a first axis and the acceleration in the upper-lower direction of the vehicle is set on a second axis, and to deduce the inclined angle or the change amount of the inclined angle from a gradient of a line to be obtained from the plotted points
Data Source
AI summary
A control device of a vehicle lamp device includes a reception unit and a control unit. The control unit includes a timing determination unit configured to determine a driving timing of an actuator configured to change a posture of the vehicle lamp device. The timing determination unit drives the actuator when an acquisition number of the output values of the acceleration sensor reaches a first number while a vehicle speed is less than a predetermined value, and drives the actuator when the acquisition number of the output values of the acceleration sensor reaches a second number smaller than the first number while the vehicle speed is equal to or greater than the predetermined value.