Road Surface Value Updating for Accurate Preview Damping Control
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Solution Overview
Problem
The precision of road surface displacement-related values used in preview damping control is reduced due to high-pass filter processing, leading to inadequate damping of the sprung portion, as low frequency components are not completely removed, affecting the accuracy of control maps in vehicles.
Innovation Solution
An update system that includes a vehicle and a storage device configured to measure and process road surface displacement-related values by applying high-pass filter processing, excluding start-stage and end-stage values to prevent precision loss, and using fast Fourier transform with weighted coefficients to identify accurate displacement values, ensuring accurate damping control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-pass filter processing is applied to remove low frequency components from road surface displacement values, then the frequency components to be damped are correctly identified, but the precision of the displacement values is reduced
Solution Approach 1:
The patent divides the road surface displacement data processing into two separate stages: first applying high-pass filter processing to identify frequency components, then using those identified components to selectively correct precision loss in the displacement values. This segmentation allows the system to handle frequency identification and precision maintenance as distinct operations.
Solution Approach 2:
The system uses the identified frequency components as feedback to determine which displacement values require precision correction. The control map storage unit receives both the filtered displacement values and the identified frequency components, using the frequency information to guide the precision maintenance process.
2Device complexity
If preview damping control is executed with reduced precision z values, then the control process is simpler, but the sprung portion is not appropriately damped
Solution Approach 1:
The patent changes the parameters stored in the control map by maintaining both the frequency-identified displacement values and the original precision values. The system selectively applies precision maintenance based on the identified frequency components, ensuring that parameters used for damping control retain sufficient precision while still enabling the control process to function.
3Stability of the object's composition
If low frequency component removal is applied to all sensor values, then consistent frequency filtering is achieved, but precision at start and end stages is reduced
Solution Approach 1:
The patent applies different quality treatment to different portions of the sensor data based on their characteristics. Start-stage and end-stage displacement values receive precision maintenance processing, while intermediate values use the standard high-pass filter processing. This local quality approach ensures that frequency filtering consistency is maintained where applicable while protecting precision at critical data points.
Data Source
AI summary
An update system for related value information, comprises a first vehicle and a storage device which stores related value information. The first vehicle provides, to the storage device, travel information formed by associating a sensor value for identifying a road surface displacement-related value, and a measurement position at which the sensor value is measured, with each other, in a period from a time at which a predetermined measurement start condition is satisfied to a time at which a predetermined measurement end condition is satisfied. The storage device updates the related value information based on based on the road surface displacement-related values from which a low frequency component is removed. The storage device updates related value information based on the road surface displacement-related values obtained by excluding, at least one of start-stage related values or end-stage related values.