Hydraulic Control Circuit Attenuation Valve Configuration
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Solution Overview
Problem
The existing hydraulic control circuits for motor vehicle roll control systems experience significant power loss and increased power consumption due to the pressure drop caused by attenuation hoses, which are designed to reduce noise and vibration but are inefficient when full pump flow is not required.
Innovation Solution
The pressure control valve is positioned upstream of the attenuation means, allowing for re-circulation of the majority of fluid flow back to the reservoir, reducing unnecessary fluid flow through the attenuation hose only when actuators require pressurized fluid, thereby minimizing power consumption and simplifying the attenuation design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an attenuation hose is positioned between the pump and the pressure control valve to reduce noise and vibration, then noise, vibration and harshness effects are reduced, but a significant pressure drop (10 to 20 bar) occurs causing increased power loss and power consumption
Solution Approach 1:
The invention extracts the attenuation function from the fluid flow path by positioning the attenuation hose in parallel with the pressure control valve rather than in series. This allows the attenuation means to handle only the bypass flow while the main flow goes directly through the pressure control valve, eliminating the pressure drop penalty while maintaining noise and vibration reduction benefits
Solution Approach 2:
The invention creates a dynamic flow distribution system where the pressure control valve dynamically allocates fluid flow between the attenuation hose path and the direct path to the actuators. When full pump flow is not required, most fluid is recirculated through the pressure control valve back to the reservoir, minimizing flow through the attenuation hose and reducing power loss
2Object-affected harmful factors
If the pressure control valve is positioned downstream of the attenuation means, then the attenuation hose can reduce pressure pulses at differing frequencies, but the pressure drop through the attenuation hose increases power consumption even when full pump flow is not required
Solution Approach 1:
The invention segments the hydraulic circuit into parallel paths: one through the attenuation hose and pressure control valve, and another direct path from the pressure control valve to actuators. This segmentation allows independent optimization of each path - the attenuation path handles noise reduction while the direct path handles power-efficient actuator supply
Solution Approach 2:
The pressure control valve serves multiple functions: it controls pressure for the actuators, manages recirculation flow back to the reservoir, and regulates flow through the attenuation hose. This multi-functionality eliminates the need for separate flow control devices and reduces overall system complexity
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 reduces power consumption and minimizes power loss by ensuring fluid flow through the attenuation hose only when necessary, while also simplifying the attenuation means and effectively managing noise, vibration, and harshness effects.
Implementation Method 1
The attenuation hose is intended to reduce any noise, vibration or harshness effects caused, or created, by the pressure pulses from the pump
Data Source
AI summary
A hydraulic control circuit (100) comprises a source (180) of fluid pressure having a fluid inlet (201) and a fluid outlet (202); a fluid reservoir (181) fluidly connected to the fluid inlet of the pressure source; an attenuation means (111) having a fluid inlet (203) fluidly connected to the fluid outlet of the pressure source, and a fluid outlet (204); a pressure control valve (199) fluidly connected to the fluid inlet of the attenuation means and to the fluid reservoir or the fluid inlet of the pressure source; and one or more valves (82-84) fluidly connected to the fluid outlet of the attenuation means.