US3746131A - System for controlling a plurality of elevator cars - Google Patents

System for controlling a plurality of elevator cars Download PDF

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Publication number
US3746131A
US3746131A US00189347A US3746131DA US3746131A US 3746131 A US3746131 A US 3746131A US 00189347 A US00189347 A US 00189347A US 3746131D A US3746131D A US 3746131DA US 3746131 A US3746131 A US 3746131A
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Prior art keywords
floor
elevator
hall call
elevator car
floors
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US00189347A
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English (en)
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K Hirasawa
K Kawatake
T Iwasaka
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Hitachi Ltd
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Hitachi Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B1/00—Control systems of elevators in general
    • B66B1/24—Control systems with regulation, i.e. with retroactive action, for influencing travelling speed, acceleration, or deceleration
    • B66B1/2408—Control systems with regulation, i.e. 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. by means of a supervisory or group controller
    • B66B1/2458—For elevator systems with multiple shafts and a single car per shaft
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B2201/00—Aspects of control systems of elevators
    • B66B2201/10—Details with respect to the type of call input
    • B66B2201/103—Destination call input before entering the elevator car
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B2201/00—Aspects of control systems of elevators
    • B66B2201/20—Details of the evaluation method for the allocation of a call to an elevator car
    • B66B2201/211—Waiting time, i.e. response time
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B2201/00—Aspects of control systems of elevators
    • B66B2201/20—Details of the evaluation method for the allocation of a call to an elevator car
    • B66B2201/212—Travel time
    • B66B2201/213—Travel time where the number of stops is limited

Definitions

  • ABSTRACT Asystem for controlling a plurality of elevator cars in which a hall call originating means is disposed at each floor landing so that passengers standing at the floor landing can designate the floors to which they want to be transferred, and a target floor memory is provided [30] Foreign Apphcanon Pnomy Data for each elevator car to store information as to the Oct. l9, 1970 Japan 45/91184 floors at which such elevator car has already been structed to stop. in the system, means are provided to [52] 11.8. C1. 187/29 R detect the Coincidence between the floor numbers [51] hit.
  • individual elevator cars should preferably be prevented from stopping at the same intermediate floors more than is required so that they can make one round trip within the shortest possible period of time thereby improving the service efficiency of the elevator system as a whole, hence shortening the passengers waiting time.
  • the reduction in the number of stoppages increases the operating speed of the elevator cars and eliminates the period of time required for the stopping, deceleration and getting on and off of the passengers thereby greatly improving the operating efficiency of the elevator system.
  • four elevator cars rated at a speed of 300 meters per minute are provided in a-building having ll floors for servicing the floor landings.
  • the probability of an elevator car stopping at one of the intermediate floors is 0.4 meaning that an elevator car stops at the specific floor four times during round trips, that the elevator car is at rest at each such floor for 10 seconds, and that the distance between the floor levels is 3.5 meters.
  • the period of time required for the elevator car to make one round trip without stopping at any floors except the bottom terminal is given by (3.5 X 20/300) z 0.23 minute 14 seconds and therefore, the mean period of time required for the elevator car to make one round trip while stopping at these floors is given by 10 X20 X 0.4 14 94 seconds.
  • the mean period of time required for the elevator car to make one round trip can be reduced to 94 10 84 seconds 94/4 z 24 seconds and 84/4 21 seconds respectively.
  • the means waiting time may be considered to be directly proportional to the mean arrival interval.
  • the mean waiting time can be reduced by about 12% due to the fact that the ratio of the latter mean arrival interval to the former mean arrival interval is
  • Conventional methods for effectively reducing the number of stoppages of elevator cars include a method in which each individual elevator car has its own preset service zone which may be fixed or variable and the-response of the elevator car'to hall calls belonging to the service zones of other elevator cars is limited, and a method in which some elevator cars are arranged to respond solely to hall calls originating from specific floors, for example, odd-numbered floors or evennumbered floors.
  • these conventional methods are limited in that they limit the response of the elevator cars to hall calls, and the results are substantially the same as when the number of servicing elevator cars is decreased
  • a hall call originating means of the type capable of designating the destination floors is disposed at each floor landing, and a target floor memory is provided for each elevator car so that it stores information as to the floors at which such elevator car has already been instructed to stop.
  • coincidence detectors detect the coincidence between the floor numbers designated by the hall call originating from the specific floor and the floor numbers stored already in the target floor memories.
  • the elevator car for which the coincidence occurs in a greatest number is selected and responds to the hall call originating from the specific floor so as to minimize the number of stoppages of the elevator cars as a whole. Consequently, the passengers waiting time can be reduced to a minimum and the desired improvement in the service can be realized.
  • Passengers standing at the specific floor from which the hall call is originated may wait a long period of time when the elevator car for which the coincidence occurs in the greatest number is quite remote from the specific floor from which the hall call is originated. 7
  • distance detectors are provided to detect the distances between'the specific floor originating the hall call and the elevator cars so as to determine the priority order of these elevator cars taking the relative distances intoaccount. Further, in the case of the elevator car which must stop at more floors than others until it reaches the specific floor from which the hall call is originated, the actual running distance between it and the specific floor is large compared with others when its running schedule is taken into account although the physical distance between it and the specific floor is short. Therefore, the actual distances that must be travelled by the elevator cars should also be detected and taken into-account for determining the priority order of the elevator cars.
  • FIG. 1 is a schematic front elevational view of a hall call originating means having a plurality of push buttons for designating the destination;
  • FIG. 2 is a schematic diagram'showing the running state of a plurality of elevator cars
  • FIG. 3 is a block diagram showing the structure of an elevator control system embodying the present invention.
  • FIG. 4 is a circuit diagram showing the structure of one form of a hall call register I-ICR preferably used in the system shown in FIG. 3;
  • FIG. 5 is a circuit diagram showing the structure of one form of a calculating order control means CD preferably used in the system shown in FIG. 3;
  • FIG. 6 is a circuit diagram showing the structure of one form of a gate G1 preferably used in the system shown in FIG. 3; and 1
  • FIG. 7 is a circuit diagram showing the structure of one form of a coincidence detector A preferably used in the system shown in FIG. 3.
  • An elevator system is well known in which a hall call originating means having a plurality of so-called hall buttons or destination registering push buttons capable of designating the destination floors is provided at each floor landing for an elevator car so that it replaces the destination floor register previously provided in the elevator cage,
  • This hall call originating means has an external arrangement as shown in FIG] in which it will be seen that a plurality of destination registering push buttons H131 to H811 are provided so as to designate any one or ones of the first floor (bottom tenninal) to the llth floor of a building having 11 floors, and this replaces the conventional hall call register having an up registering and a down registering push button.
  • the provision of such means is advantageous in that passengers need depress the destination registering push buttons in the cage again after they get on the elevator car.
  • FIG. 2 shows an elevator system in which four elevator cars A, B, C and D are provided in a building having eleven floors for servicing these floor landings.
  • the physical positions of the elevator cars are designated by 1U (up from the first floor) to U (up from the 10th floor)-when they move upward and by 2D (down from the second floor) to 1 1D (down from the eleventh floor) when they move downward.
  • the coincidence between the floor numbers designated by a hall call originating from a floor and the floor numbers already registered in the memories for the elevator cars is detected, and the elevator car for which the coincidence occurs in a greatest number is selected so that the selected elevator car can be preferentially stopped at the specific floor from which the hall call is originated.
  • the hall call originating means disposed at the landing of the fourth floor designates and registers the sixth, seventh and eighth floors, and the elevator cars A, B and C moving upward as shown in FIG. 2 are instructed already to stop at the sixth, seventh and eighth floors, at the seventh and eighth floors, and at the seventh floor respectively.
  • the elevator car A is selected to stop at the fourth floor from which the hall call is originated.
  • This manner of elevator control is advantageous in that the elevator cars B and C need not stop at the fourth and sixth floors and at the fourth, sixth and eighth floors respectively so that their movement can be accelerated by that much, and yet the increase in the number of stoppages for the elevator car A responding to the above hall call is only one corresponding to the stoppage at the fourth floor.
  • FIG. 3 is a block diagram showing the structure of an embodyment of the present invention.
  • the elevator control system includes a plurality of hall call registers HCR each disposed at the floor landings.
  • the hall call register I-ICR is of the type shown in FIG. 1 so that pas sengers standing at the floor landing can designate their destination floors by depressing the corresponding push buttons.
  • the operation of the hall call register I-ICR is such that the floor number at which the hall call register I-ICR is disposed is also automatically registered when anyone of the destination registering push buttons is depressed. For example, in the case of the hall call register HCRS disposed at the landing of the fifth floor, the call for the fifth floor is also registered when the push buttons for the floors other than the fifth floor are depressed.
  • a signal is applied to a calculating order control means CD so that it starts its calculating operation.
  • the calculating order control means CD is a common control means for all the hall call registers I-ICRl to HCRll, and therefore, a locking signal IS is applied from the calculating order control meens CD to the hall call resisters I-ICR except the hall call register I'ICR at the specific floor so that they may not apply their outputs to the calculating order control means CD.
  • the calculating order control means CD applies a signal to open a gate G1 so that the information as to the floor numbers registered by the specific hall call register I-ICR is transferred to and stored.
  • a temporary memory LAT stores the information as to all the floor numbers designated and registered in the hall call register I-ICR within about 15 seconds after the depression of a destination registering push button of the hall call register HCR at the specific floor.
  • the information requesting the stoppage at the fifth, seventh, eighth and ninth floors is stored in the temporary memory LAT when the call for the seventh floor is first registered and then, within l5 seconds thereafter, the calls for the eighth and ninth floors are registered in the hall call register I-ICRS disposed at the landing of the fifth floor.
  • Target floor memories RUNA, RUNB, RUNC and RUND are provided for the respective elevator cars A, B, C and D so that these elevator cars are stopped at the floors according to the contents of these memories.
  • Coincidence detectors AA, AB, AC and AD are connected to the temporary memory LAT and to the respective target floor memories RUNA, RUNB, RUNC originating the hall call and the respective elevator cars A, B, C and D so that the elevator car nearest to the specific floor originating the hall call may desirably respond to the hall call.
  • the outputs of the coincidence detectors AA, AB, AC and AD and the outputs of the distance detectors SDA, SDB, SDC and SDD are applied to respective adders ANA, ANB, ANC and AND, and the results of ad dition are applied to an optimum elevator car selector MMD.
  • the optimum elevator car selector MMD selects one of the elevator cars for which the coincidence between the contents of the temporary memory LAT and the contents of the target floor memories RUNA to RUND occurs in a greater number and which is relatively near the specific floor originating the hall call.
  • a signal is applied to the calculating order control means CD from the optimum elevator car selector MMD, and the calculating order control means CD applies in turn a signal to gates G2A, G2B, G2C and 62D.
  • the gates 62A to G2D are thereby opened so that the contents of the specific hall call register HCR are transferred to the target floor memory RUN for the selected elevator car.
  • FIG. 5 is a circuit diagram showing the structure of one form of the calculating order control means CD preferably used in the control system.
  • the calculating order control means CD includes a plurality of flipfiops FFl, FF2, FFll connected to a common OR element CR3 and to the hall call registers HCRI, I-ICR2, HCRll disposed at the landings of the 11 floors respectively.
  • FIG. 5 only three hall call registers I-ICRI, HCRZ and HCRI l and associated flip-flops FFl, FF2 and FFll corresponding to the first, second and I 1th floors are shown for the sake of simplicity.
  • FIG. 4 is a circuit diagram showing in detail the structure of the hall call register HCR.
  • the hall call register HCR comprises a plurality of or I l destination registering push buttons I-IBl, BB2, I-IBll, a plurality of AND elements A], A2, All associated with the respective push buttons, an OR element 0R1 delivering an output when anyone of the AND elements is turned on, a NOT element N which is turned off in response to the appearance of an output from the OR element 0R3 in FIG. 5, that is, in response to the turn-off of anyone of the flip-flops FFl to FFll in FIG. 5, and an OR element CR2 and a delay element DI for applying another input to one of the AND elements A] to All with a preset delay time of, for example, 15 seconds in response to the depression of the push button associated with this AND element.
  • the output of the flip-flop FF8 is applied to the common OR element CR3, and the output of the OR element 0R3 is applied to the NOT element N which is thereby turned off to turn off all the AND elements Al to All.
  • the output of the OR element 0R3 is applied to a delay element D2, then to a delay element D3 so that calculating order command signals LS1 and LS2 are successivey delivered from the delay elements D2 and D3, respectively.
  • the OR element 0R3 functions to lock any hall calls originating from the other floors while a suitable elevator car is being selected for responding to the hall call originated from a specific floor which is the eighth floor in this case.
  • the OR element 0R3 is turned on to turn off all the NOT element N in the hall callregisters I-ICRl to I-ICRll in the manner described above.
  • the flipflops FFl to FFll are reset by the signal LS2.
  • FIG. 6 is a circuit diagram showing the structure of one form of the gate G1 preferably used in the control system.
  • the gate G1 comprises a plurality of switches SWl to SW11 which are associated with the flip-flops FFl to FFll respectively.
  • one of the switches SW1 to SW11 corresponding to the operating one of the flip-flops FFl ro FFll is closed.
  • the output of the corresponding hall call register HCR is applied to the temporary memory LAT to be stored therein in response to the application of the signal LS1 from the calculating order control means CD.
  • FIG. 7 is a circuit diagram showing in detail the struc ture of the coincidence detectors AA to AD each of which includes a plurality of AND elements to which the temporary memory LAT and the corresponding target floor memory RUN apply their outputs.
  • the destination registering push buttons HB6, I-IB7 and HB8 of the hall call register HCR4 disposed at the fourth floor landing are depressed, the calls for the fourth, sixth, seventh and eighth floors are 7 registered in the temporary memory LAT as described already.
  • the AND elements AA6, AA7 and AA8 (not shown) in the coincidence detector AA are in the on state.
  • the output voltage E appearing across a resistor R in the coincidence detector AA is given by where r and r, (r r,,) are the resistances of the resistors R and R, respectively, N is the number of the AND elements which are in the on state, and the output from each AND element is taken as a unit voltage.
  • the output voltage E is proportional to the number N of the AND elements which are in the on state, hence this voltage is representative of the number of coincidences between the floor numbers registered in the temporary memory LAT and the floor numbers stored already in the target floor memory RUNA for the elevator car A.
  • the number of coincidences is similarly sought for the target floor memories RUNB, RUNC and RUND for the remaining elevator cars B, C and D.
  • the OR element 0R3 in FIG. 5 is turned on and the NOT element N in FIG. 4 is turned off to turn off the AND elements A6 and A8. It will be apparent from FIG. 5 that, in response to the appearance of an output from anyone of the flip-flops FFl to FFll in the calculating order control means CD, the common OR element 0R3 is turned on to deliver a signal for turning ofi the NOT elements N in all the hall call registers I-ICRl to HCRll.
  • a signal LS1 appears from the delay element D2 to open the gate Gl.
  • the hall call registers HCRI to HCRll are connected to the temporary memory LAT through the gate G1. Due to the fact that the flip-flop FF6 corresponding to the sixth floor is now set, the switch SW6 corresponding to the sixth floor is solely closed and the calls presently stored in the hall call register HCR6 are transferred to be registered in the temporary memory LAT in response to the application of the signal LS1 to the gate G1.
  • the coincidence between the contents of the temporary memory LAT and the contents of the target floor memories RUNA, RUNB, RUNC and RUND for the respective elevator cars A, B, C and D is detected by the respective coincidence detectors AA, AB, AC and AD shown in FIG. 7.
  • the elevator cars A, B, C and D are initially instructed to stop at the seventh and eighth floors, at the seventh, eighth and ninth floors, at the fifth, fourth and third floors, and at the eighth, ninth and 10th floors respectively.
  • the number of coincidences is two in the case of the elevator car A, three in the case of the elevator car B, zero in the case of the elevator car C, and two in the case of the elevator car D. Therefore, the number of coincidences is greatest in the case of the elevator car B and this elevator car B is instructed to stop at the sixth floor when the operation of the distance detectors SDA, SDB, SDC and SDD is not taken into account.
  • the present invention employs special means including the distance detectors SDA to SDD and the adders ANA to AND for compensating the number of coincidences for each elevator car by the period of time required for the elevator car to reach the specific floor.
  • the periods of time T,,-6U, T 6U, T 6U and T -6U which are required for the respective elevator cars A, B, C and D to reach the sixth floor relate generally with the number of stoppages of the elevator cars until they reach the sixth floor and the physical distance between the elevator cars and the sixth floor.
  • the distance detectors SDA, SDB, SDC and SDD detect the number of stoppages and the physical distance for the respective elevator cars A, B, C and D and apply compensating values to the adders ANA, ANB, ANC- and AND which add the compensating values to the signals representative of the numbers of coincidences applied from the respective coincidences applied from the respective coincidence detectors AA, AB, AC and AD.
  • This compensating value is added in a polarity opposite to that of the signal representative of the number of coincidences, and therefore, the adder AN delivers a smaller output with the increase in the period of time required for the associated elevator car to reach the specific floor.
  • the number of coincidences in the case of the elevator car B is three, while that in the case of the elevator car A is two as described.
  • the adder ANA delivers an output which is larger than that of the adder ANB, and the elevator car A is selected to respond to the hall call originated from the sixth floor.
  • the optimum elevator car selector MMD selects the elevator car A and the calculating order control means CD delivers a signal LS2.
  • the gates 62A to G2D are opened so that the floor number information stored in the hall call register HCR6 is transferred to the target floor memory RUNA. Since, in this case, the calls calling for the stoppage at the sixth, seventh, eighth and ninth floors have been registered in the hall call register HCR6, such information is added to the contents of the target floor memory RUNA for the elevator car A.
  • the signal LS2 is applied to the flip-flops FFl to FFll in the calculating order control means CD shown in FIG. 5 to reset same with the result that all the hall call registers HCRl to HCRll are released from the locked state and one of the remaining elevator cars is selected so that it can respond to the hall call originating from another floor.
  • the elevator car A stops at the sixth floor according to the instructions of the target floor memory RUNA.
  • the information pertaining to the sixth floor registered in the hall call register HCR6 and the information pertaining to the sixth floor stored in the target floor memory RUNA are erased.
  • the gates GZA to G2D are opened again and the contents of the hall call register HCR6 are transferred to the target floor memory RUNA.
  • New information is added to the contents of the target floor memory RUNA and represents the floor numbers which have been registered in the hall call register HCR6 until the specific elevator car A reaches the spe' cific floor or sixth floor.
  • a service priority determining system comprising hall call originating means disposed at each floor landing for generating floor landing signals of designated floors so that passengers standing at the floor landing can designate the floors to which they want to be transferred, target floor memory means provided for each of said elevator cars for storing request signals pertaining to the floors at which each said elevator car has been instructed to stop, coincidence detecting means provided for each of said elevator cars for detecting the coincidence between the floor landing signals representing floor numbers designated by a hall call originating from one of the floors and the request signals representing floor numbers stored in said target floor memory means, and means for determining the priority order of operation of said elevator cars in response to said coincidence detecting means so that the elevator car for which the coincidence between floor landing signals and request signals occurs in a greater number can be preferentially selected to respond to the hall originating from such floor.
  • An elevator control system as claimed in claim 3, which comprises means for counting time so that it starts its operation in response to the appearance of the first hall call and counts a predetermined period of time.

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  • Automation & Control Theory (AREA)
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US00189347A 1970-10-19 1971-10-14 System for controlling a plurality of elevator cars Expired - Lifetime US3746131A (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3973649A (en) * 1974-01-30 1976-08-10 Hitachi, Ltd. Elevator control apparatus
US3999631A (en) * 1974-03-25 1976-12-28 Hitachi, Ltd. Elevator control system
US4046228A (en) * 1975-05-05 1977-09-06 Westinghouse Electric Corporation Elevator system
US4081059A (en) * 1975-10-11 1978-03-28 Hitachi, Ltd. Elevator control system
EP0090642A2 (fr) * 1982-03-31 1983-10-05 Kabushiki Kaisha Toshiba Dispositif mesurant le trafic de palier pour une commande d'un groupe de cabines d'ascenseurs
US4662479A (en) * 1985-01-22 1987-05-05 Mitsubishi Denki Kabushiki Kaisha Operating apparatus for elevator
US4691808A (en) * 1986-11-17 1987-09-08 Otis Elevator Company Adaptive assignment of elevator car calls
EP0246395A1 (fr) * 1986-04-11 1987-11-25 Inventio Ag Commande d'un groupe d'ascenceur
EP0248997A1 (fr) * 1986-06-10 1987-12-16 Inventio Ag Dispositif de commande de la répartition des cabines à un palier principal pour un groupe d'ascenseurs
US20100230213A1 (en) * 2006-06-27 2010-09-16 Mitsubishi Electric Corporation Elevator group control apparatus
US8800723B2 (en) * 2010-09-30 2014-08-12 Kone Corporation Elevator system having floors locked from receiving service

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH648001A5 (de) * 1979-12-21 1985-02-28 Inventio Ag Gruppensteuerung fuer aufzuege.
JPS59227672A (ja) * 1983-06-07 1984-12-20 三菱電機株式会社 エレベ−タの運転装置
JP6912428B2 (ja) * 2018-07-31 2021-08-04 株式会社日立製作所 マルチカーエレベーター及びマルチカーエレベーター制御方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3374864A (en) * 1964-02-06 1968-03-26 Port Leo Weiser Elevator control wherein car destination is registered by same switch which registers car call
US3443667A (en) * 1968-02-29 1969-05-13 Reliance Electric & Eng Co Elevator demand memory
US3507362A (en) * 1967-01-20 1970-04-21 Reliance Electric & Eng Co Apparatus for measuring elevator car travel

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3374864A (en) * 1964-02-06 1968-03-26 Port Leo Weiser Elevator control wherein car destination is registered by same switch which registers car call
US3507362A (en) * 1967-01-20 1970-04-21 Reliance Electric & Eng Co Apparatus for measuring elevator car travel
US3443667A (en) * 1968-02-29 1969-05-13 Reliance Electric & Eng Co Elevator demand memory

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3973649A (en) * 1974-01-30 1976-08-10 Hitachi, Ltd. Elevator control apparatus
US3999631A (en) * 1974-03-25 1976-12-28 Hitachi, Ltd. Elevator control system
US4046228A (en) * 1975-05-05 1977-09-06 Westinghouse Electric Corporation Elevator system
US4081059A (en) * 1975-10-11 1978-03-28 Hitachi, Ltd. Elevator control system
EP0090642A2 (fr) * 1982-03-31 1983-10-05 Kabushiki Kaisha Toshiba Dispositif mesurant le trafic de palier pour une commande d'un groupe de cabines d'ascenseurs
EP0090642A3 (en) * 1982-03-31 1984-06-06 Tokyo Shibaura Denki Kabushiki Kaisha System for measuring interfloor traffic for group control of elevator cars
US4536842A (en) * 1982-03-31 1985-08-20 Tokyo Shibaura Denki Kabushiki Kaisha System for measuring interfloor traffic for group control of elevator cars
US4662479A (en) * 1985-01-22 1987-05-05 Mitsubishi Denki Kabushiki Kaisha Operating apparatus for elevator
EP0246395A1 (fr) * 1986-04-11 1987-11-25 Inventio Ag Commande d'un groupe d'ascenceur
US4735294A (en) * 1986-06-10 1988-04-05 Inventio Ag Elevator group control for the distribution of traffic at a main floor
EP0248997A1 (fr) * 1986-06-10 1987-12-16 Inventio Ag Dispositif de commande de la répartition des cabines à un palier principal pour un groupe d'ascenseurs
US4691808A (en) * 1986-11-17 1987-09-08 Otis Elevator Company Adaptive assignment of elevator car calls
FR2606763A1 (fr) * 1986-11-17 1988-05-20 Otis Elevator Co Installation pour l'attribution adaptative des appels de cabines d'ascenseurs aux differents niveaux d'un immeuble
US20100230213A1 (en) * 2006-06-27 2010-09-16 Mitsubishi Electric Corporation Elevator group control apparatus
US8006807B2 (en) * 2006-06-27 2011-08-30 Mitsubishi Electric Corporation Elevator group control apparatus
US8800723B2 (en) * 2010-09-30 2014-08-12 Kone Corporation Elevator system having floors locked from receiving service

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GB1358903A (en) 1974-07-03
JPS5117777B1 (fr) 1976-06-04
DE2151272A1 (de) 1972-04-20

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