Skyhook Suspension Control for Unsprung Resonance Damping
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Solution Overview
Problem
Conventional vehicle vibration damping systems face challenges in improving damping performance near the unsprung resonance frequency where a fixed point is present.
Innovation Solution
A vehicle vibration damping system that calculates damping forces using a correction control parameter obtained by multiplying a control parameter of a transfer function with a correction function to enhance damping performance near the unsprung resonance frequency, utilizing a skyhook control theory and incorporating an actuator to apply vertical control forces between the unsprung and sprung structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a correction function with quadratic Laplace operator term is introduced to cancel control parameter coefficient, then damping performance near unsprung resonance frequency is improved, but control system complexity increases
Solution Approach 1:
The patent replaces the need for complex mechanical adjustments or additional physical components with a mathematical substitution in the control algorithm. By incorporating the correction function directly into the damping force calculation formula, the system achieves improved resonance frequency performance through computational means rather than adding physical complexity.
Data Source
AI summary
A vehicle vibration damping system includes a suspension; an actuator; and a control device configured to calculate a damping force to be applied to the sprung structure based on a theory of skyhook control, and control the actuator. The control device calculates the damping force based on a correction control parameter obtained by multiplying a control parameter of a denominator of a transfer function of the sprung structure with respect to a road surface displacement of a vibration model having a virtual skyhook damper by a function for canceling a coefficient of a control parameter term. The control parameter is a product of an attenuation coefficient of the skyhook damper and a Laplace operator. The function is a function having a coefficient of the control parameter term of the transfer function as a denominator, and includes at least a quadratic term of the Laplace operator in a numerator.