Vehicle Posture Sensing for Accurate Headlight Axis Control
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Solution Overview
Problem
Existing vehicle posture calculation devices may erroneously detect changes in the road surface angle as changes in the pitch angle of the vehicle, particularly when the vehicle is transported by a trailer or ship while the ignition is off.
Innovation Solution
A vehicle posture calculation device that uses an acceleration sensor to calculate the sensor detection angle, distinguishing between changes in the road surface angle and pitch angle by determining if the vehicle's position has changed using GPS or camera image data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the sensor detection angle is used to calculate pitch angle without considering road surface angle changes, then the calculation is simple, but erroneous detection occurs when the vehicle is transported by trailer or ship
Solution Approach 1:
The system stores the sensor detection angle at the time of ignition off as a reference value before transportation occurs. This preliminary action enables the system to later compare the current sensor detection angle with the stored reference value to detect road surface angle changes and correct the pitch angle calculation accordingly, preventing erroneous detection during vehicle transportation.
2Measurement precision
If the vehicle position is monitored using GPS or camera to distinguish road surface angle changes from pitch angle changes, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The system uses GPS or camera as intermediary tools to obtain position information of the vehicle. By monitoring whether the vehicle position has changed between ignition off and ignition on, these intermediaries help distinguish between actual pitch angle changes and road surface angle changes caused by transportation, thereby improving measurement precision without requiring direct complex mechanical sensors.
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 solution effectively suppresses erroneous detection of road surface angle changes as pitch angle changes, ensuring accurate vehicle posture calculation and appropriate headlight optical axis control.
Implementation Method 1
calculates a sensor detection angle, which is a rotation angle around an axis along a vehicle width direction relative to a horizontal plane, based on a detection results of the acceleration sensor
Data Source
AI summary
A vehicle posture calculation device calculates a posture of a vehicle using an acceleration sensor. The vehicle posture calculation device calculates a sensor detection angle, which is a rotation angle around an axis along a vehicle width direction relative to a horizontal plane, based on a detection result of the acceleration sensor. If the position of the vehicle changes between ignition off and ignition on, it detects the change in the sensor detection angle between ignition off and ignition on as a change in the road surface angle. If a position of the vehicle does not change, it detects the change in the sensor detection angle between ignition off and ignition on as a change in the pitch angle of the vehicle.