Road Displacement Database Filtering for Preview Damping Control
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Solution Overview
Problem
In preview vibration damping control for vehicles, the target control force often exceeds the maximum output of the actuator when encountering large vertical road surface displacements, leading to excessive energy consumption and thermal damage.
Innovation Solution
A method for creating a database that involves detecting road surface displacement-associated information using in-vehicle sensors, calculating a road surface displacement-associated value, and storing it in a database, with the option to correct excessively large values through high-pass filtering to prevent exceeding the actuator's maximum output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the target control force is calculated based on large vertical road surface displacement, then the vibration damping control effectiveness is improved, but the actuator output exceeds maximum capacity leading to excessive energy consumption and thermal damage
Solution Approach 1:
The patent applies parameter changes by modifying the road surface displacement-associated value through high-pass filtering processing. This transforms the raw displacement data into a filtered value that removes excessive magnitude components, allowing the control force to remain within actuator capacity while preserving essential vibration damping information. The filtering parameter adjustment resolves the contradiction between maintaining control effectiveness and preventing excessive energy consumption.
2Reliability
If the target control force is calculated based on large vertical road surface displacement, then the vibration damping control effectiveness is improved, but thermal damage to actuator and control apparatus occurs
Solution Approach 1:
The high-pass filtering processing modifies the displacement parameter to remove excessive magnitude components that would cause thermal damage. By changing the parameter representation rather than the physical control goal, the system maintains vibration damping effectiveness while preventing thermal damage to the actuator and control apparatus.
3Reliability
If high-pass filtering processing is applied to correct the road surface displacement-associated value, then the actuator output is kept within maximum capacity, but the complexity of data processing increases
Solution Approach 1:
The patent replaces complex mechanical control adjustments with a mathematical filtering operation. Instead of modifying the physical actuator or control mechanism, the system uses high-pass filtering processing on the displacement data, which is computationally efficient and does not add mechanical complexity to the system.
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 approach reduces the likelihood of the target control force exceeding the actuator's maximum output, minimizing energy consumption and thermal damage, while enhancing controllability by smoothing the magnitude of the road surface displacement-associated value.
Implementation Method 1
a vertical acceleration sensor 31 and a stroke sensor 32 that detect road surface displacement-associated information associated with a vertical displacement of a road surface
Implementation Method 2
a vertical acceleration sensor 31 and a stroke sensor 32 that detect road surface displacement-associated information associated with a vertical displacement of a road surface
Data Source
AI summary
In a method of creating a database for preview vibration damping control, road surface displacement-associated information detected by a detection device is acquired, positional information capable of identifying a position where the road surface displacement-associated information is detected is acquired, a road surface displacement-associated value associated with a vertical displacement of a road surface is calculated based on the road surface displacement-associated information, and a set of data obtained by linking the road surface displacement-associated value and the positional information with each other is stored into a storage device as part of a database. When it is determined that the magnitude of the road surface displacement-associated value exceeds a permissible reference value set in advance, the magnitude of the road surface displacement-associated value is corrected in a reducing manner, prior to the step of storing the set of data into the storage device.