Hydraulic Pressure Control for Travel-to-Work Pump Switching
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Solution Overview
Problem
Conventional hydraulic systems for working machines face inefficiencies in power management and operation fluid pressure regulation, particularly in transitioning between traveling and working operations, leading to suboptimal performance and energy consumption.
Innovation Solution
A hydraulic system with a pressure supplying portion that selectively switches between operation valves and electromagnetic valves to apply counteracting pressures, allowing for efficient power reduction in traveling pumps and optimized fluid flow management through a network of fluid tubes and proportional valves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional hydraulic systems are used for working machines, then the system can perform basic traveling and working operations, but the power management is inefficient and energy consumption is high during transitions between traveling and working operations
Solution Approach 1:
The hydraulic system dynamically adjusts the displacement of the traveling pump based on operational requirements. The control device varies the pump displacement between a first value (higher) for traveling operations and a second value (lower) for working operations, optimizing energy consumption for each operational state and transition between them.
Solution Approach 2:
The system changes the operational parameters of the hydraulic pump by adjusting its displacement parameter. The control device modifies the pump displacement from a first value to a second value depending on whether the machine is in traveling or working mode, thereby optimizing energy efficiency across different operational phases.
2Power
If the hydraulic pump operates at high power to ensure sufficient fluid pressure for working operations, then the working operations can be performed effectively, but the power consumption increases during traveling operations where full power is not needed
Solution Approach 1:
The traveling pump operates dynamically with variable displacement rather than at constant high power. The control device adjusts the pump displacement in real-time based on the operational state, providing sufficient hydraulic power for working operations while reducing power consumption during traveling operations.
Solution Approach 2:
The single traveling pump serves multiple functions by varying its displacement. It provides high power output during working operations and reduced power output during traveling operations, eliminating the need for separate pumps for different operational modes and optimizing energy usage across all functions.
3Stress or pressure
If the hydraulic pump is sized to provide sufficient pressure for working operations, then the system can handle maximum load requirements, but the system complexity increases and smaller pumps cannot be used to reduce energy consumption during traveling operations
Solution Approach 1:
Rather than using a large fixed-displacement pump to ensure sufficient pressure for all operations, the system employs a variable-displacement pump that adjusts its output based on real-time requirements. This dynamic adjustment allows the use of a smaller pump that can deliver high pressure when needed without the complexity of oversized equipment.
Solution Approach 2:
The system changes the displacement parameter of the traveling pump to match operational requirements. By adjusting the pump displacement rather than relying on a fixed large-capacity pump, the system achieves necessary fluid pressure for working operations while avoiding the complexity and energy waste associated with oversized pump systems.
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
Enhances operational efficiency by reducing energy consumption, improving power management, and ensuring smooth transitions between traveling and working operations, thereby enhancing the overall performance of working machines.
Implementation Method 1
a hydraulic pump to output an operation fluid
Implementation Method 2
an operation valve having a rod to be moved depending on operation of the operation member, the operation valve being configured to change a pressure of the operation fluid based on movement of the rod
Implementation Method 3
an electromagnetic valve to change the pressure of the operation fluid
Implementation Method 4
a pressure supplying portion to supply a first counteracting pressure of the operation fluid against a first operation pressure
Data Source
AI summary
A hydraulic system for a working machine includes a hydraulic pump to output an operation fluid, a hydraulic device to be operated by the operation fluid, an operation member to be operated, a first operation valve to regulate a pressure of the operation fluid in accordance with operation of the operation member, and a pressure supplying portion to supply a first counteracting pressure of the operation fluid against a first operation pressure, the first operation pressure being a pressure of the operation fluid regulated by the first operation valve.