FA-67659 / Elevator dispatch scheduling / Member archive

Door obstruction reopen and nudging: continuous blockage timer · case 04

A curtain held blocked never triggers nudging, or brief separate obstructions add up to a long blockage.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

During a door cycle each light-curtain obstruction reopens the doors and counts; the third obstruction, or an obstruction while the curtain has been blocked continuously for 20 s or more since the first unbroken obstruction, starts nudging (slow close, curtain ignored). While nudging, curtain obstructions are ignored. The mechanical safety edge always reopens and does not affect counting. unblock ends a continuous blockage. closed ends the cycle and resets everything.

Why this case matters

Lift group controllers make these decisions many times per minute; a wrong answer strands passengers, wastes trips or overrides a safety rule.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
regression: curtain held for twenty seconds	`["reopen", "reopen"]`	`["reopen", "nudge"]`	Failed

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