Planter Downforce Accumulator Charge Evaluation
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Solution Overview
Problem
The existing downforce systems on planters face challenges in determining the charge level of hydraulic accumulators, making it uncertain when recharging or servicing is needed, which can impact performance.
Innovation Solution
A system comprising pressure sensors, orifices, and controllers connected to hydraulic accumulators, which allows for determining accumulator charge by increasing channel pressure, delaying fluid fill, turning off control valves, bleeding pressure through an orifice, and using sensors to detect pressure drops, thereby notifying operators of recharge needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If accumulators are used to accumulate energy and smooth down force adjustments, then system performance is improved, but it becomes difficult to determine charge levels and service timing
Solution Approach 1:
The patent introduces an intermediary evaluation system comprising pressure sensors, orifices, and controllers that indirectly measure accumulator charge levels. The pressure sensor monitors pressure changes in the pressure line, and the controller evaluates these changes to determine charge status, serving as a mediator between the accumulator's internal state and the operator's knowledge of its status.
Solution Approach 2:
The system implements feedback by continuously monitoring pressure changes in the hydraulic system and using this information to evaluate accumulator charge levels. The controller receives pressure data, processes it according to evaluation criteria, and provides feedback about the accumulator's charge status, enabling informed decisions about recharging or servicing.
2Measurement precision
If pressure sensors and control systems are added to evaluate accumulator charge, then measurement capability is improved, but device complexity increases
Solution Approach 1:
The pressure sensor and controller are designed to serve multiple functions: they monitor system pressure for down force control, evaluate accumulator charge levels, and provide data for determining service timing. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in device complexity while maintaining measurement precision.
3Reliability
If accumulators are not recharged in time, then performance deteriorates, but premature recharging wastes time and resources
Solution Approach 1:
The evaluation system enables preliminary action by detecting accumulator charge levels before they reach critical thresholds. The controller analyzes pressure changes and predicts when recharging will be needed, allowing operators to plan and schedule service during convenient times rather than responding to performance degradation or emergency failures.
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
Enables accurate determination of accumulator charge levels, ensuring timely recharging and maintenance, thus maintaining optimal downforce system performance.
Implementation Method 1
an orifice operatively connected to the pressure line to limit flow of fluid within the pressure line to a hydraulic zero-pressure tank
Implementation Method 2
a pressure sensor operatively connected to the pressure line... configured to determine accumulator charge for the accumulators
Implementation Method 3
Hydraulic accumulators may be operatively connected to the hydraulic actuators in order to accumulate energy and smooth out adjustments in down force
Data Source
AI summary
A planter downforce system includes a plurality of hydraulic accumulators. Each of the plurality of hydraulic accumulators is operatively connected to a pressure line associated with a row unit of a planter. A pressure sensor is operatively connected to the pressure line. An orifice is operatively connected to the pressure line to limit flow of fluid within the pressure line to a hydraulic zero-pressure tank. A controller is operatively connected to the pressure sensor and configured to determine accumulator charge pressure of the accumulators.