Vehicle Suspension Stiffness Adjustment for Brake Vibration
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Solution Overview
Problem
Conventional vehicle suspension devices, such as the axle-type suspension device, do not effectively reduce vibration, particularly during braking, which can lead to increased unsprung vibration and harshness characteristics.
Innovation Solution
A vehicle suspension device with adjustable front-back stiffness in its upper and lower intervening members, where the stiffness is decreased during smooth-braking and increased during sudden-braking, maintaining equal force compliance at the spindle position, to optimize driving stability and reduce brake vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the front-back stiffness of the suspension is increased to reduce vibration during sudden braking, then driving stability is improved, but harshness characteristics increase during smooth braking
Solution Approach 1:
The suspension device employs dynamic stiffness adjustment through the upper and lower intervening members that automatically modify their stiffness characteristics based on braking conditions. During sudden braking, the members increase stiffness to stabilize the vehicle, while during smooth braking, they reduce stiffness to minimize harshness, thereby resolving the contradiction between driving stability and harshness characteristics
Solution Approach 2:
The invention changes the stiffness parameter of the suspension system according to operating conditions. The upper and lower intervening members are designed to alter their stiffness values dynamically - increasing stiffness during sudden braking for stability, and decreasing stiffness during smooth braking to reduce harshness, thus adapting the suspension characteristics to different braking scenarios
2Object-affected harmful factors
If the front-back stiffness is decreased during smooth braking to reduce harshness, then ride comfort is improved, but driving stability deteriorates during sudden braking
Solution Approach 1:
The suspension system dynamically adjusts stiffness through the upper and lower intervening members that respond to braking conditions. During smooth braking, the members adopt lower stiffness to reduce harshness and improve comfort, while during sudden braking, they automatically increase stiffness to maintain driving stability, thus resolving the contradiction between comfort and stability
3Reliability
If the stiffness of the upper control link and lower control link is increased to reduce vibration, then unsprung vibration is reduced, but the force compliance of the spindle changes adversely
Solution Approach 1:
The invention optimizes the stiffness parameters of the upper and lower intervening members to achieve a balance between vibration reduction and force compliance. By carefully selecting and dynamically adjusting the stiffness values, the system reduces unsprung vibration while maintaining appropriate force compliance characteristics at the spindle, resolving the contradiction between these two performance aspects
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
The suspension device effectively reduces unsprung vibration and enhances driving stability by adjusting stiffness based on braking conditions, maintaining constant force compliance and minimizing harshness characteristics.
Implementation Method 1
the elastic bushings are disposed on at least one end side of the upper control link and the lower control link, thereby forming a connection structure
Implementation Method 2
an upper intervening member configured to be intervened between a vertically upper portion of the suspension device main body and the vehicle body so that a front-back stiffness of the vehicle is relatively decreased at a time of smooth-braking of the vehicle
Data Source
AI summary
A vehicle suspension device includes a suspension device main body configured to support a wheel of a vehicle to a vehicle body of the vehicle; an upper intervening member configured to be intervened between a vertically upper portion of the suspension device main body and the vehicle body so that a front-back stiffness of the vehicle is relatively decreased at a time of smooth-braking of the vehicle at which an absolute value of a braking force of the vehicle is relatively small, compared to at a time of non-braking of the vehicle; and a lower intervening member configured to be intervened between a vertically lower portion of the suspension device main body and the vehicle body so that the front-back stiffness of the vehicle is relatively increased at the time of smooth-braking of the vehicle, compared to at the time of non-braking of the vehicle.