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AssigneeOtis Elevator Company
InventorKandasamy Thangavelu
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An elevator system employing a micro-processor-based group controller (FIG. 2) communicating with the cars (3, 4) to assign cars to hall calls based on a Relative System Response (RSR) approach. However, rather than using unvarying bonuses and penalties, the assigned bonuses and penalties are varied using "artificial intellience" techniques based on combined historic and real time traffic predictions to predict the number of people behind a hall call, and, calculating and using the average boarding and de-boarding rates at "en route" stops, and the expected car load at the hall call floor. Prediction of the number of people waiting behind hall calls for a few minute intervals are made using traffic levels measured during the past few time intervals on that day as real time predictors, using a linear exponential smoothing model, and traffic levels measured during similar time intervals on previous similar days as historic traffic predictors, using a single exponential smoothing model. The remaining capacity in the car at the hall call floor is matched to the waiting queue using a hall call mismatch penalty. The car stop and hall stop penalties are varied based on the number of people behind the hall call and the variable dwell times at "en route" stops. The stopping of a heavily loaded car to pick up a few people is penalized using a car load penalty. These enhancements to RSR result in equitable distribution of car stops and car loads, thus improving handling capacity and reducing waiting and service times.
A method of controlling the dispatching of elevator cars based on a system of bonuses and penalties, said penalties including a car load penalty for penalizing the stopping of a relatively loaded elevator car at a predetermined floor registering a hall call, said method comprising the steps of:
A method of controlling the dispatching of elevator cars based on a system of bonuses and penalties, said penalties including a car load penalty for penalizing the stopping of a relatively loaded elevator car at a predetermined floor registering a hall call, said method comprising the steps of:
A method of controlling the dispatching of elevator cars based on a system of bonuses and penalties, said penalties including a hall call mismatch penalty for penalizing the stopping of an elevator car based on a comparison of the elevator's spare capacity with the number of people expected at a floor registering a hall call, said method comprising the steps of:
Dependencies are inferred from the claim text.