Hydraulic System Valve Pressure Control Low Temp Warming
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Solution Overview
Problem
Existing hydraulic systems for working machines, such as skid steer loaders and compact track loaders, face inefficiencies in fluid pressure control and warming up processes, particularly in low temperatures, leading to reduced performance and increased viscosity of operation fluids.
Innovation Solution
The hydraulic system incorporates a series of valves and fluid tubes to manage fluid pressure and flow, including a first working valve with a throttling portion and a second working valve with a variable relief function, connected through outputting fluid tubes to control the aperture and relieve pressure, ensuring efficient operation and warming up by redirecting fluid to the operation fluid tank when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the hydraulic system operates in low temperature conditions, then the machine can work in cold environments, but the operation fluid viscosity increases leading to reduced performance
Solution Approach 1:
The system performs preliminary warming up of the operation fluid by redirecting it through the heat-up fluid tube in the valve body before normal operation begins. This preliminary heating action prevents high viscosity and performance degradation when the machine starts in low temperature conditions.
Solution Approach 2:
The pilot fluid acts as an intermediary heat transfer medium. It absorbs heat from the valve body (which is heated by the operation fluid) and transfers this heat to the operation fluid through the heat-up fluid tube, effectively warming the operation fluid without direct contact with the heat source.
2Temperature
If the valve body is heated using operation fluid through the heat-up fluid tube, then the operation fluid warms up effectively, but the system complexity increases due to additional tubes and valves
Solution Approach 1:
The valve body serves multiple functions: it acts as both a control valve housing and a heat exchanger. The heat-up fluid tube integrated into the valve body allows the operation fluid to be warmed while passing through the valve, combining heating and control functions in a single component.
Solution Approach 2:
The heating function is merged with the existing valve body structure rather than being a separate system. The heat-up fluid tube is integrated directly into the valve body, and the pilot fluid heating function is combined with the operation fluid circulation path, reducing the need for separate heating equipment.
3Stress or pressure
If the first working valve throttles the operation fluid flow, then the fluid pressure is controlled, but the energy loss increases due to throttling
Solution Approach 1:
The second working valve monitors the pressure downstream of the first working valve and provides feedback control. When pressure exceeds the predetermined threshold, the second valve opens to bypass excess fluid, preventing energy loss from continued throttling while maintaining pressure control.
Solution Approach 2:
The system transitions from static throttling to dynamic pressure control. The second working valve dynamically adjusts based on real-time pressure conditions, opening or closing according to the predetermined pressure threshold, thereby optimizing energy efficiency while maintaining pressure control.
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 configuration enhances fluid pressure control and warming up processes, improving machine performance by reducing fluid viscosity and maintaining efficiency across varying temperature conditions.
Implementation Method 1
the valve body is provided with a heat-up fluid tube into which the pilot fluid outputted from the pump is supplied, the pilot fluid supplied into the heat-up fluid tube is supplied to an operation fluid tank through a relief valve or a throttle, and thereby the valve body is heated up
Data Source
AI summary
A hydraulic system includes a hydraulic pump to output an operation fluid, a hydraulic apparatus to be activated by the operation fluid, an operating member to operate the hydraulic apparatus, an operation valve to determine a pressure of the operation fluid in accordance with operation of the operating member, the operation fluid being supplied to the hydraulic apparatus, a first fluid tube connecting the hydraulic pump to the operation valve, a first working valve disposed on the first fluid tube, the first working valve being configured to change an opening aperture of the first working valve, a first outputting fluid tube connected to a section of the first fluid tube between the operation valve and the first working valve, and a second working valve disposed on the first outputting fluid tube, the second working valve being configured to change an opening aperture of the second working valve.