Latching Solenoid Valve Current Sensing for Irrigation Proof of Placement
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Solution Overview
Problem
Current irrigation systems face challenges in accurately monitoring and controlling solenoid-operated valves, leading to incorrect data recording and increased complexity, which is critical for precise application of chemicals and fertilizers to prevent nitrogen runoff and ensure regulatory compliance.
Innovation Solution
A valve assembly with a controller that applies a DC pulse to switch a latch valve between states, using a state/current detector to measure and analyze current changes, and a system for mapping valve locations and tracking status during irrigation, providing 'proof of placement' records.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pressure sensors or flow meters are added to measure valve operation, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces mechanical measurement devices (pressure sensors, flow meters) with an electrical sensing system that monitors current changes in the solenoid coil. The controller detects valve state changes by measuring current variations during solenoid activation, eliminating the need for separate mechanical sensors and reducing system complexity while maintaining measurement accuracy.
2Measurement precision
If multiple sensors are combined to provide accurate data, then measurement precision is improved, but reliability decreases due to additional points of failure
Solution Approach 1:
The patent extracts the measurement function from separate physical sensors and integrates it directly into the controller through electrical current monitoring of the solenoid coil. This consolidation removes multiple potential failure points (corroded turbine in flowmeter, incorrect calibration on pressure sensor) while maintaining accurate valve state detection through the controller's built-in sensing capability.
3Productivity
If latching solenoid valves are used for precise irrigation control, then productivity is improved, but ease of operation decreases due to monitoring complexity
Solution Approach 1:
The patent implements a self-monitoring system where the controller automatically detects valve state changes by monitoring current changes in the solenoid coil during activation. The system provides automatic feedback on valve operation status without requiring external sensors or complex monitoring equipment, making the high-productivity latching valve system easier to operate and verify.
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 ensures reliable monitoring and control of valve operations, reducing errors and complexity, and provides accurate records of material application, ensuring compliance with regulations and effective use of precision irrigation systems.
Implementation Method 1
A solenoid valve body (202) having a plunger (203) movable between an open position and a closed position
Implementation Method 2
a latch solenoid (208) positioned within the solenoid valve body (202) and configured to move the plunger (203) to the open position and latch the plunger (203) in the open position
Data Source
AI summary
The present invention provides an improved valve assembly and valve controller for controlling the movement of fluid for irrigation. In according with a preferred embodiment, the present invention teaches a system and method for monitoring the status of a valve assembly and for providing “proof of placement” for selected applicants. According to further preferred embodiments, the present invention includes a valve assembly including a valve controller for applying an electric current to a latch valve thereby switching the latch valve from a first flow state to a second flow state. According to a further preferred embodiment, the valve assembly of the present invention preferably further includes a state/current detector which preferably measures the active current being applied to the latch valve and outputs the measured waveform for analysis.