Elevator – industrial lift truck – or stationary lift for vehicle – With call registration means – Shared by plural load supports
Reexamination Certificate
1999-07-07
2001-06-05
Salata, Jonathan (Department: 2837)
Elevator, industrial lift truck, or stationary lift for vehicle
With call registration means
Shared by plural load supports
Reexamination Certificate
active
06241050
ABSTRACT:
TECHNICAL FIELD
The present invention relates to an elevator control apparatus that controllably manages a plurality of elevators which are operating.
BACKGROUND ART
Up to now, in the case where a plurality of elevators are provided together, those elevators are operated under group control. An assigning system is applied as one of group-managed operation, in which an assignment evaluation value is arithmetically operated for each elevator cage immediately after an elevator hall call is registered, and the evaluation value is assigned to the best elevator cage as a cage to be served so that only the cage to be assigned is responsive to the elevator hall call.
Furthermore, there are the following group managing systems that are made to improve the running efficiency and to reduce a waiting period on the elevator hall.
(a) As disclosed in Japanese Patent Unexamined Publication No. Hei 7-247066, in order to reduce the number of states where the elevator is not waiting on a reference floor, a departure time interval at which the elevator departs from the reference floor is controlled.
(b) As disclosed in Japanese Patent Unexamined Publication No. Hei 5-139635, the return of the elevator to the reference floor and dispersive waiting are employed together to control the elevator such that the services of the transportation from the reference floor and the transportation between the floors are improved.
However, the above-described prior art suffers from the following problems.
First, the prior art disclosed in Japanese Patent Unexamined Publication No. Hei 7-247066 is effective in the case where floors high in frequency of use at the time of attending and leaving office, etc., can be specified. However, since only the known specified floors are not always confused, it is not effective in other cases.
Second, the prior art disclosed in Japanese Patent Unexamined Publication No. Hei 5-139635 conducts only the waiting operation on the reference floor (specified floor) and the specified floor other than the reference floor regardless of the frequency of use on each floor. Thus, because the service other than the specified floors is not considered, if a waiting mode on the specified floors is entered, the service on the floors other than the specified floors is further degraded.
Therefore, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide an elevator control apparatus which is capable of improving the services of the entire elevator system by unifying the service on each floor and performing group management control with more efficiency.
DISCLOSURE OF THE INVENTION
An elevator control apparatus according to the present invention comprises: cage assignment means for assigning an elevator to be responsive to an elevator hall call through an elevator floor button from a plurality of elevators; service enable time calculating means for calculating a service enable time which is a predicted arrival time of a cage which can respond to an elevator hall call on each floor fastest; deviation calculating means for calculating a deviation index from a distribution of the service enable time which is calculated by the above-described service enable time calculating means; transportation judging means for judging whether transportation is necessary on the basis of whether the deviation index which is calculated by the above-described deviation calculating means exceeds a given value; transportation specifying means for specifying a cage and a transportation floor by which the deviation index is most improved through the transportation when the above-described transportation judging means judges that the transportation is necessary; and transportation means for sending a transportation instruction to the cage specified by the above-described transportation specifying means so as to transport the cage to the specified floor.
Also, the above-described service enable time calculating means is characterized by calculating the service enable time on each floor after a mean interval of generation of elevator hall calls.
Also, the above-described deviation calculating means is characterized by calculating at least one of a mean value, a standard deviation and a maximum value of the service enable time as the deviation index.
Also, the elevator control apparatus further comprises deviation correction judging means for judging whether the transportation should be made on the basis of judgement of whether a deviation correction level satisfies a predetermined condition by the transportation of the cage specified by the above-described transportation specifying means to a specified floor characterized in that the above-described transportation means sends the transportation instruction to the cage specified by the above-described transportation specifying means so as to transport the cage to the specified floor when the above-described deviation correction judging means judges that the transportation should be made.
Further, the above-described deviation correction judging means is characterized by judging whether the deviation correction level satisfies the predetermined condition by judging whether the deviation is corrected by not less than a given value on the basis of comparison of the deviation index calculated by the above-described deviation calculating means with the deviation index when the transportation specified by the above-described transportation specifying means is made.
REFERENCES:
patent: 4718520 (1988-01-01), Schroder
patent: 5146053 (1992-09-01), Powell et al.
patent: 5305198 (1994-04-01), Schroder et al.
patent: 5412163 (1995-05-01), Tsuji
patent: 5427206 (1995-06-01), Powell et al.
patent: 5612519 (1997-03-01), Chenais
patent: 5616896 (1997-04-01), Kontturi et al.
patent: 5955708 (1999-09-01), Amano et al.
patent: 5139635 (1993-06-01), None
patent: 7247066 (1995-09-01), None
Hikita Shiro
Yorita Masao
Leydig , Voit & Mayer, Ltd.
Mitsubishi Denki & Kabushiki Kaisha
Salata Jonathan
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