Hydraulic Damper Valve Control for Vehicle Pitch and Roll Stability
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Solution Overview
Problem
Current vehicle suspension systems fail to effectively manage roll and pitch stability during turns and acceleration/deceleration, leading to reduced ride comfort and increased risk of rollover, especially on uneven terrain.
Innovation Solution
A suspension system incorporating hydraulic dampers with pressure compensated flow valves and proportional variable relief valves, controlled by a controller that adjusts damper extension and compression based on vehicle dynamics, such as roll, pitch, and yaw rates, to lower the center of gravity and enhance stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If traditional suspension systems are used, then the vehicle can operate on uneven terrain, but the vehicle experiences excessive roll and pitch instability during turns and acceleration/deceleration
Solution Approach 1:
The suspension system employs actively controllable dampers with variable damping coefficients that dynamically adjust based on vehicle operating conditions. The controller receives inputs from sensors measuring vehicle roll angle, pitch angle, and acceleration, then modifies damper characteristics in real-time to optimize stability during turns, acceleration, and deceleration events
Solution Approach 2:
The system utilizes hydraulic dampers containing fluid chambers and controllable valves that regulate fluid flow between chambers. By controlling the restrictors and valves within the damper assembly, the system adjusts the damping force characteristics to resist roll and pitch motions, providing active stability control through hydraulic pressure management
2Reliability
If damper extension and compression are actively controlled, then ride stability and resistance to rollover improve, but the system complexity and control requirements increase
Solution Approach 1:
The control system continuously monitors vehicle dynamics through sensors that measure roll angle, pitch angle, and acceleration inputs. This feedback is processed by the controller to determine appropriate damper adjustments, creating a closed-loop control system that automatically responds to changing vehicle conditions to maintain stability and prevent rollover
Solution Approach 2:
The controllable damper assembly serves multiple functions simultaneously: it provides traditional suspension damping for ride comfort, active roll control during turns, pitch control during acceleration and deceleration, and rollover prevention. The single damper unit with adjustable characteristics replaces what would otherwise require multiple separate stabilization systems
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 system improves ride stability and handling by actively controlling damper operation to resist rollover and maintain a lower center of gravity, providing better resistance to tipping and rollover, thus enhancing safety and comfort across various terrains.
Implementation Method 1
hydraulic dampers with pressure compensated flow valves
Implementation Method 2
pressure compensated flow valves and proportional variable relief valves
Implementation Method 3
Each of the first damper and the second damper include a housing and a piston configured to sealingly interface with an inner diameter of the housing and divide the damper into a first chamber and a second chamber
Data Source
AI summary
A vehicle includes a suspension system having a first damper, a second damper, valves and a controller. Each of the first damper and the second damper include a housing and a piston sealingly interfaced with an inner diameter of the housing, dividing the damper into a first and second chamber. Each valve controls flow rate of fluid entering or exiting at least one of the first and second chamber of at least one of the first damper and the second damper. The controller controls the valves to control extension or compression of at least one of the first damper and the second damper based on at least one of a degree of roll of the vehicle during a turn of the vehicle and a degree of pitch of the vehicle during acceleration of the vehicle or a degree of pitch of the vehicle during deceleration of the vehicle.