Vehicle Vibration Damping Control Using Resonance-Corrected Wheel Data
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Solution Overview
Problem
Existing vibration damping control systems for vehicles face a decrease in vibration damping performance due to excessive unsprung mass displacement measurements caused by sprung mass resonance, leading to inappropriate controlling forces being generated based on inaccurate road surface displacement data from preview sensors.
Innovation Solution
A vibration damping control apparatus that adjusts the controlling force based on unsprung mass state quantities at an estimated passage position, using data from a sampling vehicle to differentiate between resonance conditions and actual road surface displacements, thereby reducing the generation of excessive controlling forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If unsprung mass displacement is used as preview reference data, then measurement precision is improved, but when sprung mass resonance occurs, excessive unsprung mass displacement is acquired leading to decreased vibration damping performance
Solution Approach 1:
The system determines whether the sampling vehicle was resonating when acquiring unsprung mass displacement data, and based on this feedback, selectively applies correction processing. When resonance is detected, the system corrects the excessive unsprung mass displacement values before using them for vibration damping control, thereby maintaining reliable vibration damping performance while preserving the measurement precision benefits of using unsprung mass displacement data.
2Productivity
If road surface displacement from preview sensors is used, then vibration damping control is executed, but the accuracy of road surface displacement is low leading to decreased vibration damping performance
Solution Approach 1:
The system replaces the use of road surface displacement data from preview sensors with unsprung mass displacement data acquired from vehicle sensors. This substitution eliminates the measurement accuracy problems of optical/sensing-based road surface displacement measurement while maintaining the ability to execute vibration damping control, thereby improving measurement precision without sacrificing productivity.
3Force
If excessive unsprung mass displacement is used for controlling force generation, then controlling force is generated, but the controlling force is greater than necessary leading to decreased vibration damping performance
Solution Approach 1:
The system incorporates a resonance detection mechanism that provides feedback on whether the sampling vehicle was resonating during data acquisition. Based on this feedback, the system selectively corrects excessive unsprung mass displacement values before generating controlling force, ensuring that the controlling force is appropriate and maintains reliable vibration damping performance.
Solution Approach 2:
The system changes the parameter values of unsprung mass displacement based on the resonance condition. When resonance is detected, the system adjusts (reduces) the excessive unsprung mass displacement parameter values to appropriate levels before using them for controlling force calculation, thereby generating controlling force with correct magnitude for reliable vibration damping.
Data Source
AI summary
An apparatus includes a generator and a control unit. The generator generates a vertical controlling force between a vehicle body and one wheel for damping a vehicle sprung mass vibration. The control unit changes the controlling force by controlling the generator based on an unsprung mass state quantity at an estimated passage position of the wheel at time after a predetermined time from current time; when a condition that a sprung mass of a sampling vehicle is highly likely to be resonating when the sampling vehicle passes through the estimated passage position is satisfied, compute a target controlling force based on a value less than the unsprung mass state quantity acquired by the sampling vehicle at the estimated passage position; and, at the time at which the wheel passes through the estimated passage position, control the generator such that a controlling force is equal to the target controlling force.