Hydraulic Pump Bypass Flow for Stable Pressure Output
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Solution Overview
Problem
Existing hydraulic systems in working vehicles face challenges in maintaining stable pressure output when there is a need for pressure without fluid flow, leading to unsmooth drive and pressure fluctuations due to internal leakages in fixed displacement pumps.
Innovation Solution
The hydraulic system incorporates a by-pass flow channel with a throttle element arranged parallel to the hydraulic pump, allowing for a continuous, limited discharge fluid flow back to the reservoir, ensuring continuous pump operation and stable pressure output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a fixed displacement pump is used to generate hydraulic power, then the system can provide stable pressure output, but internal leakages cause the pump to rotate periodically leading to unsmooth drive and pressure fluctuations when there is pressure requirement without fluid flow
Solution Approach 1:
The patent applies the continuity of useful action principle by introducing a by-pass flow channel that enables continuous fluid circulation through the hydraulic pump. The by-pass channel connects the pump outlet to the inlet, allowing fluid to continuously flow through the pump even when no external hydraulic actuators require flow. This continuous circulation prevents periodic rotation and ensures smooth, continuous pump operation, resolving the contradiction between pressure stability and drive smoothness.
2Ease of operation
If the pump is driven continuously to avoid pressure fluctuations, then smooth operation is achieved, but energy consumption increases
Solution Approach 1:
The patent applies parameter changes by using a controllable throttle valve in the by-pass flow channel to regulate the flow resistance. By adjusting the throttle opening, the system optimizes the balance between maintaining continuous pump operation (for smooth drive) and minimizing energy consumption. The throttle valve allows dynamic adjustment of the by-pass flow rate, enabling the system to adapt to different operational conditions and minimize energy waste while ensuring continuous pump rotation.
3Stability of the object's composition
If a by-pass flow channel is introduced to ensure continuous pump rotation, then pressure stability is improved, but system complexity increases
Solution Approach 1:
The by-pass flow channel serves multiple functions simultaneously: it ensures continuous pump rotation to prevent periodic operation, stabilizes pressure output, enables smooth drive operation, and provides a pathway for fluid circulation when no external actuators require flow. This multi-functionality justifies the additional structural element, as the by-pass channel integrates seamlessly with the existing hydraulic system components.
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 solution stabilizes pressure output and prevents fluctuations, ensuring smooth operation and energy efficiency by maintaining continuous pump rotation even when no fluid flow is needed, while minimizing energy consumption through controlled by-pass flow.
Implementation Method 1
one or more by-pass flow channels comprising one or more throttle elements for directing limited continuous discharge fluid flow from the hydraulic system
Implementation Method 2
the by-pass flow channel and the continuous by-pass flow through it will provide the system with smooth drive
Data Source
AI summary
A hydraulic system, working vehicle, and method for producing hydraulic power to a hydraulic system of a working vehicle is provided. The hydraulic system includes a fixed displacement hydraulic pump and a speed and torque controlled electric motor for driving the hydraulic pump. An electric controller is arranged to adjust the speed of the electric motor and to thereby adjust produced hydraulic fluid flow and pressure in the system. Further, there is a bypass flow channel including a throttle element for directing limited continuous discharge fluid flow from the system.