FA-67413 / Elevator dispatch scheduling / Member archive

Load weighing dispatch modes: overload boundary · case 03

A car loaded exactly to the overload limit refuses to depart, or a heavy overload departs.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

Overload (load above 110% of rating) keeps the car at the floor: no departure, no hall service, no cancellation. Otherwise the car departs; at 80% or more it runs in bypass (ignores hall calls). Anti-nuisance cancels all car calls when the load is below 10% of rating and more than three car calls are registered. Percentages are exact integer comparisons.

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: exactly 110 percent	`{"cancel_car_calls": false, "depart": false, "mode": "overload", "serve_hall": false}`	`{"cancel_car_calls": false, "depart": true, "mode": "bypass", "serve_hall": false}`	Failed

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