Fertilizer Row Unit Depth Control via Sensor Feedback

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Solution Overview

Problem

Existing fertilizer applicator systems face inefficiencies due to unnecessary soil disturbance and energy waste from offset downward pressure, inadequate depth control, and operator fatigue from varying soil conditions, which lead to suboptimal fertilizer application and potential damage to equipment.

Innovation Solution

A depth control system for fertilizer row units, incorporating a toolbar coupling, suspension members, a pressure applying device, a tensioned wheel assembly, and a knife assembly with a sensor that adjusts pressure based on measured depth to maintain optimal penetration, minimizing soil compaction and energy consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If downward pressure is maintained by the system offset by supporting gauge wheels, then fertilizer application depth is controlled, but energy is wasted and unnecessary soil disturbance or compaction occurs

Engineering Contradiction:

Improvefertilizer application depth controlVSAvoidenergy waste

Core Design Contradiction:

Manufacturing precisionVSLoss of energy

Solution Approach 1:

The patent removes the supporting gauge wheels from the system entirely. Instead of using gauge wheels to offset downward pressure, the system uses a depth control mechanism that applies pressure only when needed to maintain the desired penetration depth, eliminating the continuous energy waste and soil compaction caused by the gauge wheels

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The system transitions from a static pressure system (with fixed gauge wheels) to a dynamic pressure application system. The downward pressure is applied dynamically based on real-time depth feedback from the depth sensor, allowing the system to maintain precise depth control while minimizing energy consumption and soil disturbance

Inventive Principle:

Principle #15Dynamics

2Manufacturing precision

If downward pressure is maintained by the system offset by supporting gauge wheels, then fertilizer application depth is controlled, but unnecessary soil disturbance or compaction occurs

Engineering Contradiction:

Improvefertilizer application depth controlVSAvoidsoil disturbance and compaction

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The patent removes the supporting gauge wheels that cause soil compaction and disturbance. The depth control is achieved through a different mechanism that does not require continuous wheel contact with the soil, thereby eliminating the harmful side effects while maintaining depth precision

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The system replaces the mechanical gauge wheel support system with an electronic depth control system using sensors and automated pressure application. This substitution eliminates the mechanical soil disturbance caused by gauge wheels while maintaining precise depth control

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Device complexity

If depth control is not implemented, then system complexity is reduced, but operator fatigue increases and equipment damage risk rises due to varying soil conditions

Engineering Contradiction:

Improvesystem complexityVSAvoidoperator fatigue

Core Design Contradiction:

Device complexityVSEase of operation

Solution Approach 1:

The patent implements a feedback control system where a depth sensor continuously monitors the penetration depth and provides feedback to the control mechanism. This automated feedback loop maintains consistent depth across varying soil conditions, eliminating operator fatigue from manual adjustments while managing system complexity through straightforward sensor-controller-actuator architecture

Inventive Principle:

Principle #23Feedback

4Device complexity

If depth control is not implemented, then system complexity is reduced, but equipment damage risk increases due to varying soil conditions

Engineering Contradiction:

Improvesystem complexityVSAvoidequipment damage risk

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The depth sensor provides continuous feedback that allows the system to detect and respond to varying soil conditions. When the knife encounters unexpectedly hard or soft soil, the system automatically adjusts pressure to maintain proper depth, preventing equipment damage from excessive force or inadequate penetration while keeping the system relatively simple

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS10182522B2Depth control of an agricultural fertilizer row unit

Publication Date: 2019.01.22 BLUE LEAF I P INC

AI summary

A fertilizer row unit including a toolbar coupling, first and second suspension members, a pressure applying device, a tensioned wheel assembly, a knife assembly and a depth control system. The first suspension member has a first end pivotally coupled to the toolbar coupling. The second suspension member is generally parallel to the first suspension member. The pressure applying device is coupled to the first or second suspension member. The tensioned wheel assembly has at least one wheel. The knife assembly is pivotally coupled to both the first and second suspension members. The depth control system is coupled to the knife assembly for controlling the depth of penetration of the knife into the soil. The depth control system includes a sensor that provides a measured depth signal representative of a depth of the knife. The depth control system controls the pressure applying device dependent upon the measured depth signal.