Zonal Hydraulic System Power Limiting Logic
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Solution Overview
Problem
Conventional aircraft hydraulic systems lack efficient energy management and redundancy reconfiguration strategies, leading to suboptimal energy usage and safety during varying flight phases and emergency conditions.
Innovation Solution
A zonal hydraulic system with a central control and monitoring unit that adjusts power limits based on flight phases and health status, reconfigures architecture to prioritize critical zones, and balances motor-pump usage to extend system life and conserve energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydraulic power limits are maintained at maximum levels during all flight phases, then actuators receive sufficient power for all operations, but energy consumption increases and system wear accelerates
Solution Approach 1:
The patent implements dynamic adjustment of hydraulic power limits based on flight phase detection. The central controller receives flight phase information and dynamically modifies pressure setpoints for different hydraulic zones - maintaining high pressure during takeoff/landing phases while reducing pressure during cruise phases. This dynamic adaptation resolves the contradiction by providing maximum power only when needed for reliability-critical operations while conserving energy during less demanding flight phases.
Solution Approach 2:
The system changes hydraulic operating parameters (pressure setpoints) based on flight conditions. During different flight phases, the central controller adjusts the pressure limits for each hydraulic zone according to pre-defined parameters stored in memory. This parameter adaptation allows the system to optimize between power availability and energy consumption by matching hydraulic output to actual operational requirements of each flight phase.
2Reliability
If all hydraulic zones operate simultaneously at full power, then system redundancy is maximized, but energy consumption and motor-pump wear increase
Solution Approach 1:
The patent implements partial operation of hydraulic zones by selectively activating only the necessary number of motor-pumps based on flight phase and system demands. During cruise phases, the central controller may operate fewer motor-pumps at reduced power levels while maintaining adequate hydraulic supply for essential functions. This partial action approach preserves system redundancy capability while reducing cumulative wear on motor-pumps, thereby extending their service life.
Solution Approach 2:
The system employs periodic monitoring and adjustment of motor-pump operation cycles. The central controller continuously monitors hydraulic zone demands and periodically activates or deactivates motor-pumps based on current flight phase requirements. This periodic action pattern prevents continuous full-power operation of all motor-pumps, reducing wear while maintaining readiness for redundant operation when needed.
3Use of energy by moving object
If central control continuously monitors and adjusts all hydraulic zones, then optimal energy management is achieved, but system complexity and control requirements increase
Solution Approach 1:
The patent divides the hydraulic system into separate zonal control units, each managing a specific hydraulic zone with its own pressure regulation. The central controller segments the overall control task by communicating with individual zone controllers rather than directly controlling all actuators. This segmentation reduces central controller complexity while maintaining coordinated energy management across all zones through a modular control architecture.
Solution Approach 2:
The central controller acts as an intermediary that receives flight phase information and translates it into zone-specific pressure setpoint adjustments. Rather than directly controlling each hydraulic actuator, the central controller communicates desired pressure parameters to local zone controllers, which then manage their respective zones. This intermediary approach simplifies the overall control architecture by separating strategic decision-making from tactical execution.
Data Source
AI summary
A method of supplying hydraulic power via a zonal hydraulic system to an aircraft having a plurality of operating phases includes determining a current operating phase of the aircraft and setting a power limit (e.g., a pressure set point and/or flow limitation) for at least one hydraulic power unit based on the current operating phase. The hydraulic system includes a plurality of hydraulic zones. Each of the hydraulic zones includes a local controller, a hydraulic power unit controlled by the local controller, and at least one actuator powered by the hydraulic power unit. Energy savings may be realized by altering the pressure set point for and/or limiting the flow to hydraulic systems in inactive and/or less active zones. The zonal hydraulic system may be reconfigured for safety based on sensed failures and/or during emergency or alternate power conditions with limited available power. Duty cycles for multiple electric motor driven pumps of the system may be balanced. Dependency on a central hydraulic system controller may be minimized or eliminated by providing default power limit (e.g., pressure setting) reversion logic at the local controller.