Definition & axiom
⚠ Conflicts with the ISO 15926-4 primary definition
Label (EN)
engine
Label (PT-BR)
Definition (EN)
Definition (PT-BR)
Semi-formal axiom (Aristotelian)
Axiom type
LLM classification basis: function-based → ≡
Both definitions focus on the functional role of converting energy into mechanical work/motion. ISO defines it functionally as converting energy into mechanical force and motion; CFIHOS specifies internal combustion as the energy conversion mechanism. The identity is given by the energy conversion function, not by specific physical configuration.
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:
The identity-giving function is mechanical energy generation through energy conversion. This aligns with the already-enriched 'motor' class which has the same function, indicating engines and motors share this fundamental function but may differ in implementation mechanisms.
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Expert review
2
Genus Proximus
✓ done
Motor · 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:
ISO15926 explicitly states that an ENGINE is a MOTOR and a MACHINE. The 'motor' class is already enriched in our ontology with MechanicalEnergyGenerationFunction. This creates a clean inheritance where engines are a specialized type of motor with additional constraints on the energy conversion mechanism.
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Expert review
3
Differentia Specifica
✓ done
∃participatesIn.CombustionProcess
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Conditions that distinguish
Engine
from sibling classes under genus
Motor.
Only what is not already entailed by the genus.
Differentia expression
Differentia (natural language)
LLM rationale:
The differentia captures the essence of engines as combustion-based energy converters. CFIHOS explicitly mentions combustion ignition processes, and ISO's broader definition allows for various combustion mechanisms while maintaining the fuel-based energy conversion constraint.
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Expert review
4
Necessary Parts
✓ done
no necessary parts
▼
Consider part-whole relations beyond subsumption:
hasComponentPartAtAllTimes (universal, structurally essential)
· hasComponentPartAtSomeTime (contingent, optional component)
LLM rationale:
These parts are fundamental to the combustion process that differentiates engines from other motors. All engine subtypes (diesel, gas, petrol) require these functional components regardless of their specific implementation details.
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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:
This signature captures the fundamental thermodynamic cycle of engines: fuel and air inputs undergo combustion to produce mechanical work output plus exhaust products. This distinguishes engines from other motors by the combustion-based energy conversion.
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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 9 selected
▼
Select which CFIHOS/DEXPI properties inhere in every instance of Engine as
bfo:Quality subclasses.
Each selected property →
:EngineQuality ⊑ bfo:Quality, inheres in :Engine
Custom axioms
none
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Axioms not produced by the pipeline. Each is appended verbatim as an
rdfs:subClassOf restriction on 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
▼
Click "Detect divergences" to analyse cross-standard disagreements for this cluster.
