Cross-Flow Air Suspension Circuits for Ride Height Equalization
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Solution Overview
Problem
Air suspension systems in vehicles experience persistent pressure imbalances due to overcompensation by leveling valves, leading to uneven ride heights and instability, especially during dynamic weight shifts like turns, despite attempts to adjust air pressure.
Innovation Solution
The implementation of an air management system with independent pneumatic circuits and a cross-flow mechanism that establishes communication between both circuits only when the leveling valves are in a neutral mode, allowing for equalization of air pressure between sides of the vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If leveling valves are used to adjust air pressure in response to vehicle weight shifts, then vehicle levelness is improved, but pressure differentials persist between air springs causing continued unlevelness
Solution Approach 1:
A cross-flow valve is introduced as an intermediary component between the left and right pneumatic circuits. This valve provides a controlled pathway for air to flow between circuits, mediating the pressure differential that persists after leveling valve operation. The cross-flow valve equalizes pressures without requiring the leveling valves to remain active, resolving the contradiction between achieving levelness and maintaining pressure equilibrium.
Solution Approach 2:
The function of pressure equalization is extracted from the leveling valves and assigned to a dedicated cross-flow valve. This separation allows the leveling valves to focus solely on responding to vehicle levelness requirements, while the cross-flow valve handles the secondary function of eliminating residual pressure differentials. This functional decomposition resolves the contradiction by preventing the leveling valves from being responsible for both levelness and pressure equilibrium.
2Ease of operation
If independent pneumatic circuits are used to control each side of the vehicle, then ease of independent adjustment is improved, but pressure imbalances between circuits worsen
Solution Approach 1:
The cross-flow valve serves as a mediator that connects the independent pneumatic circuits while maintaining their independence. It provides a controlled pathway for pressure equalization without requiring the circuits to be permanently connected or dependent on each other. This resolves the contradiction by allowing independent operation when needed while providing a mechanism for pressure balance when required.
Solution Approach 2:
The system transitions from static independent circuits to dynamically connected circuits through the cross-flow valve. The valve can be activated to connect circuits for pressure equalization and deactivated to maintain independent operation. This dynamic capability resolves the contradiction by allowing the system to adapt its connectivity based on operational requirements.
3Duration of action of stationary object
If leveling valves return to neutral mode after adjustment, then valve wear is reduced, but pressure differentials cause vehicle unlevelness to persist
Solution Approach 1:
The pressure equalization function is extracted from the leveling valves and assigned to the cross-flow valve. This allows leveling valves to return to neutral mode after completing their adjustment function, extending their operational life. The cross-flow valve then handles the secondary task of eliminating residual pressure differentials, ensuring vehicle levelness is maintained without requiring prolonged leveling valve activation.
Solution Approach 2:
The cross-flow valve acts as an intermediary that maintains vehicle levelness after leveling valves have returned to neutral. It provides a passive pressure equalization pathway that operates independently of the leveling valves' active state, resolving the contradiction between valve longevity and sustained levelness.
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
This solution effectively mitigates pressure differentials, ensuring a stable and level ride by allowing air to flow between circuits when necessary, thereby maintaining equilibrium and improving vehicle stability and comfort.
Implementation Method 1
The cross-flow mechanism provides cross-flow between the first and second pneumatic circuits when the first leveling valve and the second leveling valve are both set in a neutral mode
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
An air management system for a vehicle having a first pneumatic circuit and a second pneumatic circuit, in which the first and second pneumatic circuits are pneumatically connected in a neutral position via a cross-flow mechanism. The first pneumatic circuit includes a first leveling valve configured to adjust independently the height of a first side of the vehicle. The second pneumatic circuit includes a second leveling valve configured to adjust independently the height of a second side of the vehicle. The first and second leveling valves are configured to establish pneumatic communication between the first and second pneumatic circuits when the first leveling valve is not independently adjusting the height of the first side of the vehicle and the second leveling valve is not independently adjusting the height of the second side of the vehicle.