Hydraulic Discharge Valve Control for Soil Compactor Efficiency
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Solution Overview
Problem
Soil processing machines, such as compactors, face inefficiencies and energy wastage in their hydraulic drive systems due to inadequate fluid management, leading to suboptimal operation and energy usage.
Innovation Solution
The implementation of an electrohydraulic hydraulic drive system with a discharge valve assembly that regulates fluid discharge based on parameters like temperature, viscosity, contamination, and time since last operation, ensuring efficient fluid management and energy use by only discharging fluid when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluid is continuously discharged from the hydraulic drive circuit, then contamination and overheating are reduced, but energy efficiency deteriorates due to unnecessary fluid replacement
Solution Approach 1:
The control unit continuously monitors temperature sensors and contamination sensors in the hydraulic fluid, and adjusts the discharge valve operation based on real-time feedback from these sensors. This feedback mechanism ensures fluid is discharged only when actual thresholds are exceeded, preventing both overheating and contamination while avoiding unnecessary energy consumption from continuous discharge operations.
Solution Approach 2:
The hydraulic system performs self-diagnosis and self-regulation through the control unit that automatically monitors fluid conditions and activates discharge operations only when needed. The system serves itself by detecting its own state through sensors and autonomously deciding when fluid replacement is necessary, eliminating the need for external intervention or continuous operation.
2Temperature
If fluid is discharged frequently, then fluid temperature and contamination are controlled, but fluid loss increases
Solution Approach 1:
Temperature sensors continuously monitor the hydraulic fluid temperature, and the control unit compares readings against a predetermined threshold. Fluid discharge is activated only when the temperature exceeds this threshold, ensuring thermal control while minimizing unnecessary fluid loss from frequent discharge operations.
Solution Approach 2:
The system changes the operational parameter of fluid discharge from continuous to conditional based on temperature thresholds. By monitoring temperature as a key parameter and adjusting discharge operations accordingly, the system maintains optimal fluid temperature while reducing overall fluid loss through targeted rather than continuous discharge.
3Device complexity
If a simple hydraulic system is used, then device complexity is reduced, but energy efficiency and fluid management capability deteriorate
Solution Approach 1:
The control unit serves multiple functions: it monitors temperature sensors, monitors contamination sensors, controls the discharge valve operation, and manages overall hydraulic system operation. This multi-functional approach consolidates complexity into a single control unit while enabling sophisticated energy-efficient fluid management that would be impossible with simple hydraulic systems.
Solution Approach 2:
The patent replaces purely mechanical hydraulic control with an electro-hydraulic system where electronic sensors and a control unit manage fluid discharge operations. This substitution enables precise monitoring and conditional discharge based on multiple parameters, improving energy efficiency and fluid management capability while consolidating control functions in an electronic system rather than requiring complex mechanical mechanisms.
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 enhances the energy efficiency of the hydraulic drive system by optimizing fluid usage and maintaining optimal operating conditions, reducing energy wastage and improving the overall operational efficiency of the soil processing machine.
Implementation Method 1
an electrohydraulic pressurized fluid source with at least one electric motor and at least one hydraulic drive pump
Implementation Method 2
a hydraulic drive circuit supplied with pressurized fluid by the at least one hydraulic drive pump
Data Source
AI summary
A soil processing machine includes a hydraulic drive system including an electrohydraulic pressurized fluid source with at least one electric motor and at least one hydraulic drive pump, a hydraulic drive circuit fed with pressurized fluid by the at least one hydraulic drive pump, at least one hydraulic drive motor fed with pressurized fluid from the hydraulic drive circuit, and a discharge valve assembly for discharging fluid from the hydraulic drive circuit to a fluid reservoir. The hydraulic drive system is designed to operate the discharge valve assembly as a function of at least one of the following parameters: a temperature of the fluid in the hydraulic drive circuit, an ambient temperature, a viscosity of the fluid in the hydraulic drive circuit, a degree of contamination of the fluid in the hydraulic drive circuit, a period of time since the last start-up of the hydraulic drive system, a period of time since the last fluid was discharged from the hydraulic drive circuit.