Hydraulic Pump Flow Control for Work Machine Efficiency
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Solution Overview
Problem
In the splitting state of hydraulic pumps, the working unit of a work machine does not receive a sufficient flow rate of operating oil, leading to decreased speed and responsiveness, and thus reduced efficiency when switching from a merging state.
Innovation Solution
A control system that includes a first and second hydraulic pump, a passage connecting them, an opening and closing device, a cylinder pressure data acquisition unit, an operation amount data acquisition unit, and a pump flow rate calculation unit to calculate and control the flow rates of the hydraulic pumps based on cylinder pressure and operation data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If hydraulic pumps are controlled based on pump pressure in splitting state, then pump pressure control is simplified, but the flow rate required for driving the working unit is not sufficiently supplied
Solution Approach 1:
The control system calculates the flow rate of operating oil discharged from each hydraulic pump based on cylinder pressure data and operation amount data, then uses this calculated flow rate information for pump control. This feedback mechanism ensures that the actual flow rate supplied matches the required flow rate, resolving the contradiction between simplified control and sufficient flow rate supply.
Solution Approach 2:
The patent replaces traditional pressure-based control with a flow rate-based control system that uses calculation units to determine actual flow rates from pressure and operation data. This substitution of control methodology enables precise flow rate management while maintaining control system feasibility.
2Ease of operation
If hydraulic pumps are controlled based on pump pressure, then control implementation is easier, but the working unit does not operate at sufficient speed and responsiveness
Solution Approach 1:
The control system continuously monitors cylinder pressure and operation amount to calculate actual flow rates, then adjusts pump operation accordingly. This feedback loop ensures that the working unit receives sufficient flow rate for high-speed operation while keeping the control implementation manageable through automated calculations.
Solution Approach 2:
The system calculates the required flow rate in advance based on operation amount data before the actual operation occurs, allowing the hydraulic pumps to be pre-positioned to deliver the necessary flow rate, thereby ensuring sufficient operating speed and responsiveness.
3Device complexity
If hydraulic pumps are controlled based on pump pressure, then control system simplicity is maintained, but working efficiency decreases
Solution Approach 1:
The control system uses feedback from cylinder pressure and operation amount measurements to calculate actual flow rates and adjust pump performance accordingly. This feedback-based approach optimizes working efficiency by ensuring pumps operate at the correct flow rate, while the automated calculation process keeps the overall system structure manageable.
Solution Approach 2:
The system dynamically changes control parameters from simple pressure-based control to flow rate-based control using calculated values. By changing the control parameter from pressure alone to a derived flow rate parameter, the system achieves optimal working efficiency without significantly increasing structural complexity.
Data Source
AI summary
A control system includes a cylinder pressure data acquisition unit that acquires cylinder pressure data indicating a pressure of operating oil of a hydraulic cylinder; an operation amount data acquisition unit that acquires operation amount data of an operating device; a pump flow rate calculation unit that calculates a first pump flow rate indicating a flow rate of the operating oil discharged from a first hydraulic pump and a second pump flow rate indicating a flow rate of the operating oil discharged from a second hydraulic pump in a splitting state in which a passage is closed based on the cylinder pressure data and the operation amount data; and a pump control unit that controls the first hydraulic pump and the second hydraulic pump based on the first pump flow rate and the second pump flow rate.