Actuator Control System Adaptive Flow Pressure Differential
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing hydraulic control systems for heavy equipment, such as excavators and dozers, face inefficiencies due to slow response times and excessive pressure requirements, leading to unnecessary strain on machines and inefficient fuel use, as they often deliver more pressure than necessary to meet load demands.
Innovation Solution
An actuator control system that includes a pump, actuator valve, pump pressure sensor, load pressure sensor, and a controller capable of comparing pump and load pressure values to selectively implement primary and secondary control strategies, adjusting pressure differentials to maintain efficient and stable operation by switching between pump-regulated and valve-regulated modes based on margin pressure ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pump control is used to maintain a buffer pressure between pump delivery pressure and maximum load pressure, then the pump can deliver maximum load demand, but the pump reacts slowly to load pressure changes and delivers excessive pressure
Solution Approach 1:
The system dynamically switches between pump-regulated mode and valve-regulated mode based on real-time pressure differential conditions. When the pressure differential is large, the system transitions to valve-regulated mode for rapid response. When the pressure differential is small, the system uses pump-regulated mode for energy efficiency. This dynamic adaptation resolves the contradiction between maintaining sufficient pressure and avoiding excessive pressure delivery.
Solution Approach 2:
The control system changes the regulation parameter from pure pump displacement control to a hybrid approach involving both pump displacement and control valve position. By adjusting the control valve in valve-regulated mode, the system can rapidly modify fluid flow characteristics without waiting for pump response, thereby reducing excessive pressure delivery while maintaining reliability.
2Reliability
If a high amount of pressure differential is maintained to ensure pump pressure is sufficient, then load demands are met, but unnecessary strain is placed on the machine and fuel is inefficiently used
Solution Approach 1:
The system dynamically adjusts the pressure differential by switching between two operational modes. In valve-regulated mode, a larger pressure differential is permitted temporarily to ensure load demand is met. In pump-regulated mode, the pressure differential is minimized to reduce energy consumption. This dynamic adjustment ensures pump pressure sufficiency while optimizing fuel efficiency based on actual operating conditions.
Solution Approach 2:
The system applies partial pump regulation combined with valve regulation rather than relying solely on pump control. The valve provides additional flow control capability that allows the pump to operate at more efficient pressure levels, reducing the excessive pressure that would otherwise be required to compensate for slow pump response and ensuring adequate load pressure.
3Reliability
If pump control is used to regulate fluid delivery, then maximum load demand can be met, but the response time to load pressure changes is slow
Solution Approach 1:
The control valve serves as an intermediary element between the pump and the actuators. In valve-regulated mode, the control valve rapidly adjusts fluid flow in response to load pressure changes, providing fast response without requiring the pump to react quickly. This intermediary action maintains load demand fulfillment while dramatically improving response speed.
Solution Approach 2:
The control function is segmented into two parts: pump displacement control for overall flow regulation and control valve position control for rapid pressure response. This segmentation allows each component to perform its optimal function - the pump provides steady flow while the valve provides rapid adjustment capability, resolving the contradiction between reliability and response speed.
Data Source
AI summary
An actuator control system is disclosed. The actuator control system may have a pump and at least one actuator. The actuator control system may further have an actuator valve configured to control the at least one actuator. The actuator control system may also have a pump pressure sensor configured to determine a pump pressure value and a load pressure sensor configure to determine a load pressure value. The actuator control system may additionally have a controller configured to receive the pump pressure value and the load pressure value. The controller may further be configured to compare the pump pressure value and the load pressure value, and selectively implement a primary control strategy and a secondary control strategy based on the comparison.