Fluidic Suspension Cross-Circuit for Slope Stability
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Solution Overview
Problem
Existing roll-stabilized and roll-stabilizing chassis with fluidically working cross circuits are inadequate for driving on sloping ground surfaces, particularly in agricultural areas where lateral inclination can lead to unfavorable vehicle stability.
Innovation Solution
A chassis with fluidically sprung and damped axles, utilizing double-acting fluid cylinders connected in a cross-circuit for active roll stabilization, which can switch between two operating modes: one for level or slightly inclined ground and another for steeply sloping terrain, adjusting pressure distribution to maintain vehicle stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a fluidic cross circuit is used for roll stabilization, then vehicle stability on level ground is improved, but vehicle stability on steeply sloping ground deteriorates
Solution Approach 1:
The patent implements a dynamic switching mechanism that allows the fluidic cross circuit to operate in different modes depending on terrain conditions. The system can switch between a cross-circuit mode for level ground and a pressure-relief mode for steep slopes, making the stabilization system adaptive rather than static. This resolves the contradiction by enabling the system to optimize performance for different operating conditions.
Solution Approach 2:
The patent changes the operational parameters of the fluidic system based on terrain slope. On level ground, the cross circuit maintains pressure balance for roll stabilization. On steep slopes, the system changes parameters by pressure-relieving the downhill cylinder, allowing the vehicle to adapt to varying terrain conditions and maintain stability across different environments.
2Stability of the object's composition
If pressure is applied to both piston sides of fluid cylinders, then roll stabilization is improved, but vehicle stability on steep slopes deteriorates
Solution Approach 1:
The patent extracts or removes pressure from the downhill fluid cylinder on steep slopes by connecting it to a pressure relief line leading to a reservoir. This takes out the destabilizing pressure that would otherwise act against the vehicle's stability on inclined terrain, allowing the uphill cylinder to provide effective stabilization without counterproductive forces from the downhill side.
3Ease of operation
If a fluidic cross circuit is used for active roll stabilization, then lateral inclination is reduced, but adaptability to sloping terrain is worsened
Solution Approach 1:
The system dynamically adapts its operation based on terrain slope detection. On level ground, the cross circuit actively reduces lateral inclination through pressure equalization. On steep slopes, the system dynamically switches to a pressure-relief mode, accepting greater lateral inclination to maintain overall vehicle stability, thus achieving terrain adaptability.
Solution Approach 2:
The patent prepares for steep slope conditions by providing a pressure relief line and reservoir in advance. When steep terrain is detected, the system can immediately relieve pressure from the downhill cylinder, preventing instability before it occurs. This preliminary preparation enables the system to handle varying terrain types effectively.
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 chassis effectively stabilizes the vehicle on varying terrain, reducing lateral inclination and ensuring stable operation even on steep slopes by dynamically adjusting the fluidic connections and pressure accumulators, enhancing roll stabilization and anti-roll control.
Implementation Method 1
Each piston side (50-l, 50-r) of the at least two double-acting fluid cylinders (36-l, 36-r) of the at least one axle (30) is pressurized under the weight load (40) of the vehicle body (14), while a respective ring side (54-l, 54-r) of the fluid cylinder (36-l, 36-r) is pressure-relieved or at least partially pressure-relieved
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
Chassis of a land vehicle with a fluidically sprung/damped axle, which is supported against the vehicle body on both sides of the vehicle by means of a double-acting fluid cylinder (36-I, 36-r). Each piston side (50-I, 50-r) of the fluid cylinders (36-I, 36-r) is pressurized under the weight load of the vehicle body, while one ring side (54-I, 54-r) is unloaded. In a first operating mode, the axle (28, 30) is sprung/damped by engaging the piston sides (50, 50-I, 50-r) and the ring sides (54, 54-I, 54-r) of the fluid cylinders (34, 34-I, 34-r, 36, 36-I, 36-r).In a second operating mode, to reduce / compensate for a vehicle body that is strongly inclined laterally on the slope, each of the two piston sides (50-I, 50-r) is shut off from all other fluidic connections, while at least the ring side (54-l, 54-r) of the fluid cylinder (36-l, 36-r) located downhill is pressure relieved via a switchable fluidic connection (72).