Hydraulic Pressure Switching by Implement Position to Prevent Overload
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Solution Overview
Problem
In mining work machines, the forced commonality of hydraulic systems due to size constraints leads to overloading and premature wear of components when larger hydraulic cylinders are used, or reduced performance when designed for lower pressures, making it challenging to maintain optimal operation and durability.
Innovation Solution
A hydraulic system with a load sense pressure relief system and controller that adjusts the system pressure based on the implement position, using a central valve and solenoids to switch between multiple available pressures, ensuring optimal power delivery while preventing excessive loading and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If larger hydraulic cylinders are placed on machines designed for smaller cylinders, then power and lifting capacity are improved, but component overloading and premature failure occur
Solution Approach 1:
The patent implements a dynamic pressure control system that automatically adjusts hydraulic system pressure based on real-time monitoring of implement position and load conditions. The controller modulates the hydraulic pump output to provide variable pressure levels, enabling the system to deliver high power when needed while preventing excessive pressure that would cause component overloading and failure.
2Power
If the machine is designed to withstand higher pressures and loads, then power and capacity are improved, but machine mass increases which decreases performance
Solution Approach 1:
The patent changes the operating pressure parameter dynamically based on actual work conditions. The system monitors implement position and automatically adjusts hydraulic pressure to match the required load, allowing the machine to operate at high power levels only when necessary while maintaining lower pressures during normal operations, thus avoiding the need for a permanently oversized hydraulic system.
3Ease of manufacture
If commonality of physical components is enforced due to size constraints, then manufacturing cost and design simplicity are improved, but component overloading and premature wear occur
Solution Approach 1:
The patent incorporates a feedback control system that continuously monitors implement position and hydraulic system conditions. The controller uses this feedback information to automatically adjust pump pressure and flow, ensuring that common hydraulic components operate within their designed pressure and load limits regardless of machine size variations, thereby preventing overloading and premature wear.
4Reliability
If hydraulic pressure is limited to protect components, then component durability is improved, but excessive power is lost and machine performance decreases
Solution Approach 1:
The patent employs a dynamic pressure adjustment mechanism that continuously adapts hydraulic system pressure to match actual work requirements. The controller monitors implement position and automatically increases pressure when high power is needed for heavy loads, then reduces pressure during light-duty operations, thereby maintaining both component durability and optimal machine performance across varying operating conditions.
Data Source
AI summary
A hydraulic system for controlling an implement on a work machine may include a hydraulic reservoir, a hydraulic pump in fluid communication with the reservoir, a central valve in fluid communication with the pump and configured for controlling the implement, a load sense pressure relief system, and a controller. The controller may be configured for controlling the central valve and the load sense pressure relief system and selecting between operating the hydraulic system at a first pressure and a second pressure based on a factor relating to implement position.