Variable Damper Control for Ride Comfort and Posture Stability
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Solution Overview
Problem
Existing vehicle control systems face a trade-off between ride comfort and posture stability, leading to reduced vibration damping performance when the vehicle is turned, braked, or driven on undulating road surfaces.
Innovation Solution
A vehicle control apparatus and system that includes a posture stability control portion, a ride comfort control portion, and an instruction value calculation portion to prioritize ride comfort control when the vehicle's posture change and sprung vibration exceed predetermined values, using a variable damper to adjust forces between the vehicle body and wheel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If posture stability control is prioritized when the vehicle is turned, braked, or driven on undulation road surfaces, then posture stability is improved, but vibration damping performance reduces
Solution Approach 1:
The control system dynamically switches between posture stability control and vibration damping control based on real-time detection of vehicle state. When large vibrations are detected during maneuvers like turning or braking on undulation roads, the system transitions from prioritizing posture stability to prioritizing vibration damping, thereby resolving the contradiction adaptively
Solution Approach 2:
The system changes the control parameter priority based on detected vehicle conditions. By monitoring whether the vehicle is undergoing large posture changes or large vibrations, the control parameters are adjusted to prioritize either posture stability or vibration damping performance accordingly
2Reliability
If ride comfort control is prioritized to improve vibration damping, then vibration damping performance is improved, but posture stability may be compromised
Solution Approach 1:
The system employs dynamic control mode switching that adapts to real-time vehicle conditions. When large vibrations are detected during maneuvers, the system dynamically shifts priority to ride comfort control for vibration damping, then switches back to posture stability control when vibrations subside, resolving the contradiction through temporal adaptability
3Reliability
If a control dead zone is provided to prevent deterioration of vibration damping performance, then vibration damping is improved, but the system complexity increases
Solution Approach 1:
The system uses parameter-based control mode selection where the control dead zone threshold is set based on detected vibration magnitude and vehicle state parameters. This approach maintains vibration damping performance through conditional parameter adjustment rather than through complex structural modifications
Data Source
AI summary
An ECU includes a posture stability control portion configured to determine an instruction value for controlling a variable damper according to an input change in a posture of a vehicle, a ride comfort control portion configured to determine an instruction value for controlling the variable damper according to an input sprung vibration of the vehicle, and an instruction value calculation portion configured to determine an instruction value directed to the variable damper based on both the instruction values of the posture stability control portion and the ride comfort control portion. The instruction value calculation portion prioritizes the instruction value of the ride comfort control portion when a value indicating the change in the posture of the vehicle is equal to or larger than a predetermined value and a value indicating a sprung vibration in a sprung resonance frequency band is larger than a predetermined value.