Predictive Hydraulic Pressure Rails for Robotic Terrain Actuation
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Solution Overview
Problem
Hydraulic drive systems in robotic devices often operate at higher nominal pressures than necessary, leading to inefficiencies and potential insufficient pressure for actuation, especially when the desired pressure for specific tasks is unknown until the moment of actuation, resulting in energy wastage and reduced flexibility.
Innovation Solution
Implementing a control system that predicts desired pressure levels based on sensors detecting load, environment, and task requirements, adjusting the pressurized hydraulic fluid output to match these predictions, thereby optimizing pressure distribution across multiple pressure rails and reducing excess pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydraulic drive systems operate at higher nominal pressures, then sufficient pressure for actuation is ensured, but energy consumption increases and system efficiency decreases
Solution Approach 1:
The hydraulic system dynamically adjusts pressure levels based on real-time actuation requirements. The control system monitors load conditions and modifies pressure rail outputs accordingly, transitioning from static high-pressure operation to dynamic pressure modulation. This ensures sufficient pressure is available when needed while reducing energy consumption during normal operation.
Solution Approach 2:
The system changes pressure parameters adaptively rather than maintaining a fixed high nominal pressure. By varying pressure levels according to actual actuation demands, the system optimizes the balance between ensuring sufficient actuation pressure and minimizing energy consumption throughout different operational phases.
2Force
If hydraulic drive systems operate at higher nominal pressures, then actuation force is sufficient, but system efficiency decreases due to excess pressure
Solution Approach 1:
The control system prepares pressure rails in advance by pre-charging them to appropriate pressure levels based on predicted actuation requirements. This preliminary action ensures that when actuation is needed, sufficient force is immediately available without continuously maintaining high pressure across all rails, thereby reducing energy losses from excess pressure.
Solution Approach 2:
The hydraulic system serves itself by using feedback from actuation sensors and control algorithms to automatically adjust pressure distribution. The system monitors its own state and self-regulates pressure levels to match actual force requirements, eliminating the need for continuous high-pressure operation and reducing energy waste from excess pressure.
3Device complexity
If fixed nominal pressure is used, then system simplicity is maintained, but flexibility in pressure management is reduced
Solution Approach 1:
The control system provides multiple functions through a unified pressure management architecture. It can maintain fixed pressure when appropriate, dynamically adjust pressure levels, predict future pressure needs, and coordinate multiple pressure rails simultaneously. This multi-functional approach delivers flexibility in pressure management while avoiding the need for separate specialized systems for each function.
Solution Approach 2:
The system incorporates feedback mechanisms that monitor actuation requirements and environmental conditions, using this information to adaptively adjust pressure levels. This feedback loop enables the system to transition from fixed nominal pressure operation to flexible, demand-responsive pressure management, optimizing performance across varying operational conditions.
4Use of energy by moving object
If pressure is adjusted in real-time, then energy efficiency improves, but response time for actuation may be compromised
Solution Approach 1:
The control system performs preliminary pressure adjustments in advance of actual actuation events by predicting future pressure requirements based on current state and environmental factors. This pre-positioning of pressure levels ensures that when actuation is commanded, the hydraulic system is already prepared to deliver the required force immediately, maintaining fast response times while enabling energy-efficient pressure management during transitional periods.
Data Source
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AI summary
A robotic device may traverse a path in a direction of locomotion. Sensor data indicative of one or more physical features of the environment in the direction of locomotion may be received. The implementation may further involve determining that traversing the path involves traversing the one or more physical features of the environment. Based on the sensor data indicative of the one or more physical features of the environment in the direction of locomotion, a hydraulic pressure to supply to the one or more hydraulic actuators to traverse the one or more physical features of the environment may be predicted. Before traversing the one or more physical features of the environment, the hydraulic drive system may adjust pressure of supplied hydraulic fluid from the first pressure to the predicted hydraulic pressure.