Dynamic Air Suspension Pressure Equalization via Cross-Flow
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Solution Overview
Problem
Air suspension systems in vehicles often experience persistent pressure imbalances due to dynamic weight shifts, leading to uneven leveling and ride quality issues, as existing leveling valves overcompensate and fail to account for pressure differentials between air springs.
Innovation Solution
An enhanced pneumatic suspension system with a system controller that independently adjusts air pressure in two separate pneumatic circuits and establishes pneumatic communication between them only when necessary, using a cross-flow mechanism and sensors to monitor height and pressure differentials, ensuring equilibrium air pressure and ride height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If leveling valves independently adjust air pressure to air springs on each side of the vehicle, then vehicle height control is improved, but pressure imbalance between sides persists causing vehicle to remain unlevel
Solution Approach 1:
The patent merges the previously independent pneumatic circuits for left and right sides by introducing a cross-flow air line that connects both circuits. This allows air to flow between sides, equalizing pressure and enabling the vehicle to achieve proper leveling, while each side retains independent height control capability through its own electronically actuated valve.
Solution Approach 2:
The cross-flow air line acts as an intermediary element between the left and right pneumatic circuits. It mediates pressure imbalances by allowing air to transfer from the higher pressure side to the lower pressure side, thereby resolving the persistent pressure differential that prevented proper leveling.
2Speed
If electronically actuated valves respond to vehicle weight shifts, then dynamic leveling response is improved, but pressure differentials between air springs are not accounted for
Solution Approach 1:
The system incorporates pressure sensors in both pneumatic circuits that provide feedback to the control unit. The control unit monitors pressure differentials between left and right sides and adjusts valve operation accordingly, ensuring that pressure equilibrium is maintained while preserving rapid response to dynamic weight shifts.
3Device complexity
If common air lines connect air springs on adjacent axles, then system simplicity is improved, but pressure imbalances propagate across the vehicle
Solution Approach 1:
The patent segments the pneumatic system into independent left and right circuits, each with its own air lines and control valve. This segmentation prevents pressure imbalances from propagating across the vehicle, as each side can be controlled independently. The cross-flow connection is added selectively to equalize pressure only when needed.
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 effectively mitigates pressure imbalances and maintains vehicle levelness by allowing cross-flow between air springs when both leveling valves are in a neutral mode, providing a stable and comfortable ride with better traction.
Implementation Method 1
The system controller is configured to establish pneumatic communication between the first and second pneumatic circuits when the system controller is not adjusting independently the air pressure of the one or more air springs of the first pneumatic circuit and not adjusting independently the air pressure of the one or more air springs of the second pneumatic circuit
Implementation Method 2
Air suspension systems for vehicles have a plurality of air suspension bags supporting one or more vehicle axles in pairs on either side of each axle
Implementation Method 3
The system controller is configured to adjust independently air pressure of the one or more air springs of the first pneumatic circuit and adjust independently air pressure of the one or more air springs of the second pneumatic circuit
Data Source
AI summary
An air management system for a vehicle having a supply tank, a system controller integrated with the supply tank, a first pneumatic circuit pneumatically connected to the system controller, and a second pneumatic circuit pneumatically connected to the system controller. The system controller adjusts independently air pressure of the first pneumatic circuit and the second pneumatic circuit without establishing pneumatic communication between the first and second pneumatic circuits. The system controller establishes pneumatic communication between the first and second pneumatic circuits when the system controller is not adjusting independently the air pressure of the first pneumatic circuit and the second pneumatic circuit.