Hitachi, Ltd.

Kanji Yoneda

Takeo Yuminaka

Soshiro Kuzunuki

Kotaro Hirasawa

Yasunori Katayama

Sadao Hokari

Masao Nakazato

Takanobu Hatakeyama

Masumi Imai

Kazuhiro Sakata

Tomiaki Kurihara

Toshio Meguro

In an elevator system in which an elevator car serves a plurality of floors in response to hall calls and cage calls, the number of, for example, up hall calls originated from, for example, the 2nd floor is counted, and the number of cage calls, classified by destination floors, registered in the elevator car after the elevator car has served each of the up hall calls is also counted. The count of the hall calls and the count of the cage calls classified by destination floors are compared with each other, and, on the basis of the result of comparison, the probabilities of origination of cage calls, classified by destination floors, which will be registered in the elevator car after the elevator car has subsequently served a new up hall call which would be originated from the 2nd floor, are calculated for forecasting future cage calls.

Apparatus for calculating elevator cage call forecast

An abnormal speed detector for an elevator system having an elevator car for servicing a plurality of floors, means for driving the elevator car in response to a speed command and a speed detector for detecting a running speed of the elevator car is disclosed. The abnormal speed detector comprises means for storing a set of speed data indicating a predetermined abnormal speed checking pattern as a function of running time or running distance of the elevator car, means for reading out of the storage means one of the set of speed data corresponding to an instant value of the running time or running position of the elevator car after the start of run, and means for comparing an actual speed of the elevator car with the readout speed data to determine if the speed of the elevator car is normal or not.

Abnormal elevator speed detector

An elevator control apparatus in which a three-phase AC output from a three-phase AC generator rotating with running movement of an elevator car is converted into a train of pulses, and the number of such pulses is counted by a counter which provides a count indicative of the position of the elevator car. When the elevator car is actuated to start from its standstill condition, the running direction of the elevator car is detected on the basis of the direction of phase rotation of the three-phase AC output from the generator, and a predetermined correction data is added to or subtracted from the count depending on the detected running direction of the elevator car so as to correct the count error appearing in the starting stage of the elevator car.

Elevator control apparatus

An elevator system has a system control device for controlling a plurality of elevator cars and elevator car operation control devices for operatively controlling each of said elevator cars in accordance with signals issued in the system control device. At least one of the elevator car operation control devices includes an interface unit to receive hall-call signals issued in said hall-call registration device and a signal processor to supply the signals delivered from the interface unit to said system control device, to be supplied the signals treated in said system control device and to supply treated signals to an elevator car operation control section constituting a part of said elevator car operation control device.

Elevator system

Growing community of inventors

Katsuta, Japan

Kanji Yoneda