Hydraulic Control Device Flow Division Loss Reduction
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Solution Overview
Problem
Existing hydraulic control systems for work machines experience flow division loss and decreased actuator speed when hydraulic actuators with different load pressures are operated in combination, leading to inefficiencies and increased pump flow rates.
Innovation Solution
A hydraulic control system with multiple pumps and spools that adjusts delivery flow rates based on operation instructions, increasing the flow rate of one pump when multiple actuators are operated simultaneously and interrupting communication between certain actuators to reduce flow division loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If hydraulic actuators with different load pressures are operated in combination using a prior hydraulic control circuit, then the operating speed of hydraulic actuators is maintained, but flow division loss increases
Solution Approach 1:
The patent applies dynamics by making the communication path between the second hydraulic actuator and hydraulic pump adjustable rather than fixed. The control valve selectively opens or closes the communication path between the second hydraulic actuator and the second hydraulic pump based on operational conditions. When the first hydraulic actuator operates alone, the communication path is opened to allow the second hydraulic actuator to receive hydraulic fluid from the second hydraulic pump. When the first hydraulic actuator operates in combination with the second hydraulic actuator, the communication path is closed to prevent flow division loss. This dynamic adjustment resolves the contradiction by maintaining actuator speed when needed while eliminating energy loss during combined operations.
2Speed
If the delivery flow rate of hydraulic pumps is increased to maintain actuator speed during combined operation, then actuator speed is maintained, but unnecessary pump flow rate increases
Solution Approach 1:
The patent applies segmentation by dividing the hydraulic pump system into two independent pumps (first hydraulic pump and second hydraulic pump), each capable of independently supplying hydraulic fluid to hydraulic actuators. The first hydraulic pump supplies hydraulic fluid to the first hydraulic actuator through the first control valve, while the second hydraulic pump supplies hydraulic fluid to the second hydraulic actuator through the second control valve. This segmentation allows each pump to be optimized for specific operational scenarios, preventing the need to increase the flow rate of both pumps during combined operations and thus avoiding unnecessary pump flow rate increases while maintaining actuator speed.
3Device complexity
If a single hydraulic pump supplies hydraulic fluid to multiple hydraulic actuators through spools, then device complexity is reduced, but flow division loss occurs during combined operation
Solution Approach 1:
The patent applies merging by combining two hydraulic pump systems into a coordinated operation. The first hydraulic pump and second hydraulic pump work together to supply hydraulic fluid to the first hydraulic actuator and second hydraulic actuator respectively. The control valves are coordinated such that during combined operations, the communication path between the second hydraulic actuator and second hydraulic pump is closed, directing all necessary flow through the first hydraulic pump. This merging approach maintains device complexity at an acceptable level while eliminating flow division loss by strategically coordinating the operation of multiple pumps and control valves.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces flow division loss and maintains actuator speed by optimizing flow distribution among hydraulic actuators, enhancing operational efficiency and reducing unnecessary pump flow rates.
Implementation Method 1
a pump delivery amount increases in accordance with the operation amount of an operating device, and at the same time, a spool in a control valve is operated by a pilot pressure based on the operation amount to permit a hydraulic pump to communicate with hydraulic actuators
Data Source
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AI summary
An object of the present invention is to provide a hydraulic control system for a work machine that is capable of reducing the loss caused by flow division while reducing a decrease in the speed of a hydraulic actuator due to a combined operation. The hydraulic control system for a work machine includes a first hydraulic actuator, one hydraulic pump, a second hydraulic actuator, and another hydraulic pump. The hydraulic control system further includes operating instruction detection means and pump flow control means. The operating instruction detection means detects that operating instructions are issued to the first hydraulic actuator and the second hydraulic actuator. The pump flow control means individually adjusts the delivery flow rate of the one hydraulic pump and the another hydraulic pump in accordance with operation amounts designated by the operating instructions for the first and second hydraulic actuators. When the first and second hydraulic actuators are simultaneously operated, the pump flow control means increases the delivery flow rate of the one hydraulic pump to a higher rate than when the first hydraulic actuator is operated and the second hydraulic actuator is not operated.