Hydraulic Pump Flow Distribution Control for Work Machines
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Solution Overview
Problem
Hydraulic systems in work machines face pressure loss when merging operating oils from multiple pumps, requiring efficient distribution to actuators with different pressure and flow rate requirements, which existing systems fail to manage effectively.
Innovation Solution
A control system that calculates a distribution flow rate based on the operating state and load of the working unit, switching between merging and splitting states to optimize the supply of operating oil from multiple hydraulic pumps to actuators, using a control device and opening/closing mechanism to manage the flow distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If operating oils from two hydraulic pumps are merged, then the system can supply operating oil to multiple actuators, but pressure loss occurs when the pressure is decreased to supply high flow-rate oil
Solution Approach 1:
The hydraulic system is segmented into multiple independent supply paths. The control device selectively connects each hydraulic pump to specific actuators based on their requirements, rather than merging all oil flows into a single path. This allows high-pressure oil to reach high-pressure actuators without pressure loss, while high-flow actuators receive adequate flow from dedicated pump supply.
Solution Approach 2:
The system dynamically switches between merging and splitting states based on real-time operating conditions. The control device monitors actuator requirements and adjusts the hydraulic circuit configuration accordingly, transitioning from a merged supply mode to a split supply mode when pressure loss would occur, and vice versa when merging is beneficial.
2Stress or pressure
If operating oil pressure is set based on high-pressure actuators, then high-pressure actuators can operate correctly, but high flow-rate actuators experience pressure loss
Solution Approach 1:
Different pressure levels are provided locally to different actuators based on their specific requirements. The control device configures the hydraulic circuit so that high-pressure actuators receive high-pressure oil from the pump, while high-flow actuators receive oil at appropriate pressure levels, eliminating unnecessary pressure loss in each local supply path.
3Loss of energy
If operating oils are split and supplied to different actuators from different pumps, then pressure loss is reduced, but the system complexity increases
Solution Approach 1:
The control device serves multiple functions: it monitors the operating states of all actuators, calculates distribution flow rates, determines optimal pump-actuator pairings, and executes circuit configuration changes. This multi-functional control unit manages the hydraulic circuit complexity centrally, allowing the physical hydraulic components to remain relatively simple while achieving intelligent, adaptive oil distribution.
4Productivity
If the system switches between merging and splitting states, then operating efficiency is improved, but the switching control complexity increases
Solution Approach 1:
The control device continuously monitors the operating states of actuators and uses this feedback to determine when switching between merging and splitting states is beneficial. By calculating distribution flow rates and comparing them against system capabilities, the control device makes intelligent switching decisions that optimize efficiency while managing complexity through algorithmic control rather than complex physical switching mechanisms.
Data Source
AI summary
A control system for controlling a work machine including a working unit including elements and actuators that drives the elements includes: a first hydraulic pump and a second hydraulic pump each of which supplies operating oil to at least one of the actuators; and a control device that calculates a distribution flow rate of operating oil distributed to each of the actuators based on an operating state of the working unit and switches, based on the calculated distribution flow rate, between a first state in which the operating oil supplied from both the first hydraulic pump and the second hydraulic pump is supplied to the actuators and a second state in which the actuator to which the operating oil is supplied from the first hydraulic pump is different from the actuator to which the operating oil is supplied from the second hydraulic pump.