Fault detection by analysis of coupled pressure and depth for ground-engaging components

Christopher Schoeny, Minooka, IL (US); Trevor Philip Stanhope, Oak Lawn, IL (US)

USPTO: us-12667039 · published 2026-06-30 · patents · A01B 63/22· F15B 19/005· G01L 19/0092· A01C 5/064

Fault detection by analysis of coupled pressure and depth for ground-engaging components

Christopher Schoeny, Minooka, IL (US) , Trevor Philip Stanhope, Oak Lawn, IL (US) This is my paper

Pith reviewed 2026-06-30 23:31 UTC · model grok-4.3

classification patents A01B 63/22F15B 19/005G01L 19/0092A01C 5/064

keywords fault detectionagricultural implementfluid cylinderposition sensorpressure sensorcontrol systempiston rodground-engaging tool

0 comments

The pith

A controller identifies faults in agricultural ground-engaging tools by checking whether observed piston position changes match expected pressure changes and vice versa.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The patent describes a control system for an agricultural implement that pairs a position sensor on a fluid cylinder's piston rod with a pressure sensor inside the cylinder. The controller derives a position change from one signal and a pressure change from the other over the same time interval, then computes the expected value of each change from the observed value of the other. It flags a fault if the actual position change falls outside a threshold range of its expected value or the actual pressure change falls outside its expected range. A sympathetic reader would care because the approach uses only the two existing signals to monitor tool behavior without separate inputs for load, temperature, or soil resistance.

Core claim

The controller receives position and pressure signals, computes the actual position change and pressure change during a time period, determines the expected pressure change from the position change and the expected position change from the pressure change, compares each actual value to its expected counterpart, and identifies a fault when either comparison shows a deviation beyond the respective threshold range.

What carries the argument

Cross-prediction of position change from pressure change and pressure change from position change using only the two sensor signals to detect inconsistencies.

If this is right

Fault detection can proceed in real time using only position and pressure sensors already present on the fluid cylinder.
The method applies directly to monitoring ground-engaging tools without requiring separate sensors for external operating conditions.
A fault alert can be generated from either a position mismatch or a pressure mismatch or both.
The system supports continuous operation of the implement by comparing signals during normal movement periods.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

The same cross-check logic could be tested on other hydraulic cylinders in non-agricultural equipment to see whether the two-signal approach suffices.
Tuning the two threshold ranges separately might allow the controller to distinguish between different fault types such as leaks versus mechanical binding.
Field trials that record both sensor data and actual tool performance under varying soil conditions would show how often the expected-value calculations hold without extra inputs.

Load-bearing premise

An expected pressure change can be computed reliably from an observed position change, and vice versa, using only the two sensor signals without additional inputs for load, temperature, soil resistance, or fluid condition.

What would settle it

A controlled test in which a known fault such as a cylinder leak is introduced yet the position and pressure changes remain within their expected thresholds, or no fault is present yet the changes deviate due to unmodeled field variations.

read the original abstract

1 . A control system for an agricultural implement, comprising: a position sensor configured to monitor a position of a piston rod of a fluid cylinder, wherein the fluid cylinder is configured to apply a force to a ground-engaging tool of the agricultural implement via the piston rod; a pressure sensor configured to monitor a fluid pressure inside the fluid cylinder; and a controller communicatively coupled to the position sensor and to the pressure sensor, wherein the controller comprises a memory and a processor, and the controller is configured to: receive a position signal from the position sensor; receive a pressure signal from the pressure sensor; determine a position change of the piston rod based on the position signal during a certain period of time; determine an expected pressure change based on the position change; determine a pressure change of the fluid pressure inside the fluid cylinder based on the pressure signal during the certain period of time; determine an expected position change based on the pressure change; compare the position change to the expected position change; compare the pressure change to the expected pressure change; and identify a fault in response to determining the position change is not within a first threshold range of the expected position change, or determining the pressure change is not within a second threshold range of the expected pressure change, or a combination thereof.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Desk Editor's Note private letter to a colleague

This is a patent claim for cross-checking position and pressure sensors on farm hydraulics, but it supplies no equations, thresholds, or data to make the method workable.

read the letter

This patent application describes a control system that monitors a hydraulic piston's position and the cylinder pressure, then flags a fault if the observed change in one does not match the expected change derived from the other.

The claim is narrow and specific to ground-engaging tools on agricultural implements. It spells out the sensors, the time-window comparison, and the basic mismatch logic in straightforward terms. That is the extent of what is new here.

The description stops at the procedural outline. There are no formulas for computing the expected values, no example thresholds, and no discussion of how factors like load, temperature, or soil resistance would be handled. The document also contains no test results or validation steps.

Because this is a patent filing rather than a research paper, it does not present evidence that the approach holds up in practice. The core assumption—that the two signals alone are enough to generate reliable expectations—remains unexamined.

Engineers working on patent portfolios in agricultural machinery might note the claims for prior-art purposes. Technical readers looking for methods, data, or reproducible logic will find nothing to engage with. I would not bring this to a reading group, cite it, or send it for peer review.

Referee Report

1 major / 0 minor

Summary. The manuscript describes a control system for an agricultural implement that uses a position sensor and a pressure sensor on a fluid cylinder to monitor a ground-engaging tool. The controller calculates changes in position and pressure over a time period, derives expected changes from the observed signals, compares them to the actual changes, and identifies a fault if either comparison falls outside a threshold range.

Significance. If the expected change calculations prove accurate under real operating conditions using only the two sensor signals, the system could provide an efficient method for detecting faults in ground-engaging components without requiring additional sensors for load, temperature, or other factors. This would be significant for improving reliability in agricultural machinery.

major comments (1)

[Abstract] The abstract claims that the controller can 'determine an expected pressure change based on the position change' and 'determine an expected position change based on the pressure change', but provides no description, equation, or procedure for how these expected values are computed from the signals. This is load-bearing for the central claim, as the fault identification relies entirely on these comparisons.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their review. We address the single major comment below.

read point-by-point responses

Referee: [Abstract] The abstract claims that the controller can 'determine an expected pressure change based on the position change' and 'determine an expected position change based on the pressure change', but provides no description, equation, or procedure for how these expected values are computed from the signals. This is load-bearing for the central claim, as the fault identification relies entirely on these comparisons.

Authors: The manuscript consists of the independent claim of a patent application, which by design states the inventive concept at a functional level without prescribing specific implementation details such as equations or algorithms. The claimed invention is the system architecture that performs mutual cross-verification between observed and expected position/pressure changes to identify faults; the particular method used to derive the expected values (model-based, empirical, or otherwise) is an implementation choice left to the skilled artisan and is not part of the claimed subject matter. This level of generality is standard and appropriate for patent claims. revision: no

Circularity Check

0 steps flagged

No significant circularity; no equations or derivations present

full rationale

The patent application describes a controller that receives position and pressure signals, computes changes, determines expected changes from the observed signals, compares them to thresholds, and flags faults on mismatch. No equations, models, algorithms, or data are supplied for how the expected values are computed. The text consists solely of a high-level functional specification of signal processing steps with no self-referential fitting, self-citations, ansatzes, or renamings. The derivation chain is absent, rendering the description self-contained as a procedural claim without any reduction to its inputs by construction.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

The patent claim rests on the unstated premise that position and pressure remain predictably coupled under field conditions, but the abstract introduces no explicit free parameters, mathematical axioms, or new physical entities.

pith-pipeline@v0.9.1-grok · 5798 in / 1172 out tokens · 31818 ms · 2026-06-30T23:31:42.863653+00:00 · methodology

discussion (0)

Lean theorems connected to this paper

Citations machine-checked in the Pith Canon. Every link opens the source theorem in the public Lean library.

IndisputableMonolith.Foundation.DAlembert.Inevitability bilinear_family_forced unclear

?

unclear
Relation between the paper passage and the cited Recognition theorem.

determine an expected pressure change based on the position change; determine an expected position change based on the pressure change; identify a fault in response to determining the position change is not within a first threshold range of the expected position change, or determining the pressure change is not within a second threshold range of the expected pressure change
IndisputableMonolith.Foundation.AbsoluteFloorClosure absolute_floor_iff_bare_distinguishability unclear

?

unclear
Relation between the paper passage and the cited Recognition theorem.

the controller comprises a memory and a processor, and the controller is configured to: receive a position signal from the position sensor; receive a pressure signal from the pressure sensor

What do these tags mean?

matches: The paper's claim is directly supported by a theorem in the formal canon.
supports: The theorem supports part of the paper's argument, but the paper may add assumptions or extra steps.
extends: The paper goes beyond the formal theorem; the theorem is a base layer rather than the whole result.
uses: The paper appears to rely on the theorem as machinery.
contradicts: The paper's claim conflicts with a theorem or certificate in the canon.
unclear: Pith found a possible connection, but the passage is too broad, indirect, or ambiguous to say the theorem truly supports the claim.