Hall calls are allocated clockwise from floor N. The round tπp ends one position below the lowest down-call floor. A car round tπp begins counterclockwise from the first up-call, being the lowest possible position of a car. The optimization begins from the last call N (see Figure 1), which is the hall call below the lowest car position. The optimal routing (OR) algoπthm uses Bellman's pπnciple of optimahty to reduce the number of route combinations. The constraints affect to the optimahty of the result, but reduction of the route combina- tions is still needed. With the DACA algoπthm, elevators only move when there are hall calls The existing hall call is reserved for the car with the minimum cumulative cost More reliable results are obtained than with the ACA algoπthm since not only the cuπent situation with existing hall calls is considered but also the effect of future events on the cuπent call allocation. The ACA algoπthm is used in allocating future hall calls to reduce the number of decision alternatives, but any other call allocation algoπthm can be applied as well. Hmd the moment the hall call has been served. The existing hall call is allocated for each car in turn and the same passenger traffic giving hall calls is simulated for some minutes be.
The registration of a new hall call staπs the allocation process. The registration of a new hall call was chosen as the moment of decision, such as in the ACA algoπthm. The DACA algoπthm can be considered as an extension of the ACA. To remove the restlessness of the previous control the DACA (Dynamically Adaptive Call Allocation) algoπthm was developed (Publication IV).
B66B1/2458- For elevator systems with multiple shafts and a single car per shaft.by means of a supervisory or group controller
with retroactive action, for influencing travelling speed, acceleration, or deceleration where the allocation of a call to an elevator car is of importance, i.e. B66B1/2408- Control systems with regulation, i.e.with retroactive action, for influencing travelling speed, acceleration, or deceleration