Definition & axiom
⚠ Conflicts with the ISO 15926-4 primary definition
Label (EN)
gas engine
Label (PT-BR)
Definition (EN)
Definition (PT-BR)
Semi-formal axiom (Aristotelian)
Axiom type
LLM classification basis: structure-based → ⊑
Gas engine is primarily defined by its constructive characteristics: it is a specific type of internal combustion engine that uses gaseous fuel, spark ignition, and reciprocating piston mechanism. While it has the general function of mechanical energy generation (inherited from engine), the differentia is structural/operational - the fuel type (gaseous vs liquid), ignition method (spark vs compression), and reciprocating mechanism.
Validation status
Why primitive (necessary only)
Reviewer notes
FOL theory & disjointness
First-order logic theory (generated)
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Disjoint with
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Expert review
Axiomatization steps
1
Identity-Giving Function
✓ done
⚠ not anchored
MechanicalEnergyGenerationFunction → MechanicalEnergyGenerationProcess
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COPI-Core operation
⚠ Process parent
PlannedProcess reaches no COPI-Core operation, and no gap (out of scope / coverage gap) is recorded.
LLM rationale:
Gas engine shares the same identity-giving function as the already-enriched 'engine' class - converting fuel energy into mechanical energy. The gaseous fuel and spark ignition are constructive differentia, not functional differentia.
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Expert review
2
Genus Proximus
✓ done
Engine · Assembly
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Genus (genus proximum)
Most specific superclass — may be a domain class like "Valve" or an IOF-Core root.
BFO/IOF-Core Root
bfo:Object branch
bfo:ObjectAggregate branch
bfo:ImmaterialEntity branch
LLM rationale:
From the parent candidates, 'engine' is the most specific appropriate superclass and is already enriched in our ontology with MechanicalEnergyGenerationFunction. While 'INTERNAL COMBUSTION ENGINE' and 'RECIPROCATING PISTON ENGINE' are more specific, they are not yet enriched. The genus 'engine' provides the correct functional basis, and the gas engine differentia will specify the constructive details.
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Expert review
3
Differentia Specifica
✓ done
∃participatesIn.MechanicalEnergyGenerationProcess ⊓ ∃hasComponentPartAtAllTimes.SparkIgnitionSystem ⊓ ∃hasComponentPartAtAllTimes.ReciprocatingPistonMechanism
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Conditions that distinguish
Gas Engine
from sibling classes under genus
Engine.
Only what is not already entailed by the genus.
Differentia expression
Differentia (natural language)
LLM rationale:
The three differentiating conditions are all necessary and together sufficient to distinguish gas engines from other engine types: gaseous fuel input (vs liquid fuels), spark ignition (vs compression ignition), and reciprocating mechanism (vs rotary turbines).
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Expert review
4
Necessary Parts
✓ done
no necessary parts
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Consider part-whole relations beyond subsumption:
hasComponentPartAtAllTimes (universal, structurally essential)
· hasComponentPartAtSomeTime (contingent, optional component)
LLM rationale:
These parts are universally necessary for gas engine operation: ignition system for combustion initiation, reciprocating mechanism for energy conversion, cylinder block for containment, and gas admission system for fuel delivery.
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Expert review
5
Process Participation Signature ⟨I, O, T⟩
✓ done
FuelPortion + PortionOfAir → ExhaustGas
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Inputs (I)
Outputs (O)
Transformation (T)
LLM rationale:
Gas engines specifically consume gaseous fuel and air, producing mechanical energy and exhaust gases through internal combustion process with reciprocating motion.
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Expert review
More
Alternative labels
none
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Synonyms / alternative labels (comma-separated) — skos:altLabel
Language auto-detected on export (PT if the label contains accents, EN otherwise).
Properties as BFO qualities
0 of 22 selected
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Select which CFIHOS/DEXPI properties inhere in every instance of Gas Engine as
bfo:Quality subclasses.
Each selected property →
:GasEngineQuality ⊑ bfo:Quality, inheres in :GasEngine
Custom axioms
none
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Axioms not produced by the pipeline. Each is appended verbatim as an
rdfs:subClassOf restriction on Gas Engine.
Write the restriction block in Turtle syntax (without the leading
rdfs:subClassOf).
Example: [ owl:onProperty :hasPart ; owl:someValuesFrom :Wellhead ]
Cross-standard divergences
none detected yet
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Click "Detect divergences" to analyse cross-standard disagreements for this cluster.
