JPS6175778A - Method of controlling group of elevator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a group management control method for elevators, and is particularly effective in a call allocation system.

[Conventional technology]

Multiple elevators are managed as a group, and when a hall call occurs, the status of each elevator (car position, driving direction,
A so-called call assignment method is widely adopted in which an evaluation value of each elevator is calculated according to a predetermined evaluation formula based on the call status, etc., and the hall call is assigned to the most suitable elevator based on the result. Various parameters are used to calculate this evaluation value, and among them, there is one that uses the waiting time (or predicted waiting time) from the time a hall call occurs until the elevator arrives.

For example, when a hall call occurs, the waiting time for the hall call and other allocated hall calls is determined and the average value thereof is minimized. An evaluation method for assigning the hall call to an elevator, and the maximum waiting time of the hall call and the hall call assigned to the own machine are determined for each elevator.
There are evaluation methods that allocate the hall call to the elevator that minimizes the maximum waiting time.

However, the above waiting time (predicted waiting time) is more precisely the waiting time for hall calls, not the actual waiting time for hall customers. That is, it is considered that at least 1 Å or more of customers are waiting at the time when a hall call actually occurs, and several customers are waiting until the elevator arrives.

Therefore, the waiting time (predicted waiting time) calculated using the conventional method
This is the waiting time for the first person to press the hall button, and does not take into account the waiting time for those who arrive at the hall later.

For this reason, whether one person is waiting for a hall call or a large number of people are waiting, the same treatment is applied, making it impossible to perform an accurate evaluation.

[Means for solving problems]

The present invention has been made to solve the above problems,
A hall waiting customer detection device is installed on each floor, and the product of the number of customers waiting at that time and the predetermined time is added every predetermined time, and the total waiting time (total predicted waiting time) of customers on that floor is calculated as an evaluation value. The feature is that it is used for calculations.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

Figure 1 is a diagram showing the relationship between the elapsed time after a hall call occurs on a certain floor and the change in the number of waiting customers.For simplicity, here, hall calls occur only in the upward direction, and all waiting customers Think of it as a waiting list for an upward trend. In FIG. 1, tl is the time when a hall call occurs, tl is the current time 10 seconds after t, and t
3 indicates the expected arrival time of the elevator 20 seconds after tl.

Here, in order to obtain the total waiting time Aux of all waiting customers in the upward direction one second after the hall call is generated, for example, the waiting customers in the hall are detected by the waiting customer detection device at fixed time intervals, and the number of waiting customers is It can be found by adding the products of For example, if a certain period of time is 1 second and the number of customers waiting immediately after 1 second from the generation of a hall call is N1, then Aux, 2 (1X Ni) is obtained.

Therefore, in FIG. 1, the total waiting time A at the current time t2
u1O is Auto -2: (1x N1) -1x (i+1+2+3+3+3+4+5+5+5)
-32 seconds.

Assuming that the number of waiting customers does not change from tl to t3, it will be Bu-5X10"50 seconds in Figure 1. The current cumulative waiting time Auto and the future cumulative waiting time Bu are evaluated as values. For example, the first
In the figure, the hall call that occurred at time t1 is 1
Assuming that a new hall call occurs on another floor at the current tl, the evaluation value of car No. 1 is calculated by adding the above cumulative waiting time of AugO + Bu (total expected waiting time) and 1 additional hall call. If there is a hall call assigned to car No. 1, the total waiting time at time t2 is calculated in the same way, and whether car No. 1 is optimal for the hall call that occurs at time t2 is determined based on the evaluation values of other cars. Compare and judge.

It should be noted that the method of allocating hall calls by using the waiting time for the already allocated hall calls in calculating the evaluation value is well known, so the explanation thereof will be omitted here.

The above is a case where only an upward call occurs in the hole,
The same applies when only a down call occurs.Next, we will explain how to calculate the total waiting time when both up and down hall calls occur in the same hall.

Figure 2 is a diagram showing the relationship between the elapsed time and the number of waiting customers when a hall call in the ascending direction occurs on a certain floor and then a hall call in the descending direction occurs, where t4 is the time when the ascending hall call occurs;
t5 is the time when the down hole call occurs, t6 is the current time, t7
is the expected arrival time of the elevator.

In Fig. 2, if Ni is the number of customers waiting just one second after the hall call is generated as described above, then N1 to N5 before t5 can all be considered to be customers waiting in the upward direction, and the number of customers waiting in the upward direction at t5 is The total waiting time Au5 can be calculated using the same calculation as described above. Regarding the first customer waiting data N6 after the occurrence of a descending call, there is always one customer waiting in the descending direction, and for N5 minutes there are customers waiting in the ascending direction. If N6 increases by more than 2 Å than N5, the remaining rNg of N6
-Ns -IJ Since the direction of the people is unknown, they will be distributed based on the ratio of people waiting to go up and down the floor. This customer waiting ratio may be calculated by learning, etc., or it may be simply divided by 172 or the ratio of the number of floors by direction.

Here, for simplicity, we assume 1/2, and the total time Au≦ in the upward direction and the total waiting time At+4 in the downward direction 6 seconds after the hall call is generated are Au6−Au5 + (N
5+ N-N-')

The same holds true after N7. Generally, when a descending hall call occurs j seconds after an ascending hall call, the total waiting times AuX and ADX after X seconds can be calculated as follows. Furthermore, the total expected waiting time from the current moment to the expected arrival time of the elevator can be easily determined as described above, assuming that there is no change in the number of customers waiting at the present moment.

In FIG. 2, the shaded area is the total waiting time in the downward direction, and the rest is the total expected waiting time in the upward direction.

In this way, for example, if a new hall call occurs on another floor at the current time, the total waiting time (total expected waiting time) for the hall call that has already been allocated is calculated as described above, and a new hall call is generated. It is used to calculate the evaluation value of each machine for assigning hall calls.

〔Effect of the invention〕

According to the present invention, the total waiting time that takes into account the number of customers waiting is used in calculating the evaluation value, not just the waiting time after a hall call occurs, so even if the waiting time is the same, only one person can wait. Priority can be given to floors where there are many waiting customers over floors where there are no waiting customers, so the average waiting time per person can be reduced, and the overall operational efficiency can be greatly improved.

[Brief explanation of the drawing]

1 and 2 are diagrams showing the relationship between the elapsed time from the occurrence of a hall call and changes in the number of waiting customers for explaining the present invention. tl, t461. Upward hall call occurrence time 15,... Downward hall call occurrence time 12.1. ,,,current time t3. t7. ,,Estimated elevator arrival time Ni, ,Number of customers waiting 1 second after the hall call is generated

Claims (1)

[Claims] Multiple elevators are put into service for multiple service floors, and when a hall call occurs, the evaluation value of each elevator is calculated based on the condition of the elevator according to a predetermined evaluation formula, and the optimal elevator is selected based on the results. In the system in which hall calls are allocated, each floor is equipped with a hall waiting customer detection device, and when a hall call occurs, the product of the number of waiting customers at that time and a certain time is added up every certain time, and the total number of customers on that floor is calculated. 1. A group management control method for elevators, characterized in that the total waiting time or total predicted waiting time of the number of waiting customers is determined, and the total waiting time or total predicted waiting time is used as the evaluation value.