US3902571A - Elevator control system - Google Patents

Elevator control system Download PDF

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Publication number
US3902571A
US3902571A US414353A US41435373A US3902571A US 3902571 A US3902571 A US 3902571A US 414353 A US414353 A US 414353A US 41435373 A US41435373 A US 41435373A US 3902571 A US3902571 A US 3902571A
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Prior art keywords
car
floor
hall call
detecting
stoppage
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US414353A
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English (en)
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Tatsuo Iwasaka
Takeo Yuminaka
Hideto Matsuzawa
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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
    • B66B3/00—Applications of devices for indicating or signalling operating conditions of elevators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B1/00—Control systems of elevators in general
    • B66B1/02—Control systems without regulation, i.e. without retroactive action
    • B66B1/06—Control systems without regulation, i.e. without retroactive action electric
    • B66B1/14—Control systems without regulation, i.e. without retroactive action electric with devices, e.g. push-buttons, for indirect control of movements
    • B66B1/18—Control systems without regulation, i.e. without retroactive action electric with devices, e.g. push-buttons, for indirect control of movements with means for storing pulses controlling the movements of several cars or cages

Definitions

  • PATENTED SEP 2 ELEVATOR CONTROL SYSTEM The present invention relates to an improved elevator control system effectively used with an elevator system comprising a plurality of elevator cars serving a plurality of floors.
  • the prospective passenger is not sure which of the cars is ready to answer the hall call, because it is impossible to predict at the time of generation of the hall call which of the cars actually arrives first at the floor from which the hall call was originated.
  • An object of the present invention is to provide an elevator control system which enhances the reliability of the guide lamp for informing prospective passengers which of the cars is going to answer the hall calls from them, thereby improving car service to them.
  • Another object of the invention is provide an elevator control system which eliminates wasteful deceleration and stoppage of cars for improved operation thereof.
  • One of the features of the invention lies in that the registration of a hall call from a landing of a floor is cancelled only when that car which is indicated on the guide lamp at that landing of the floor to serve the same floor is decelerated to stop thereat.
  • Another feature of the invention is that the registration of a hall call from a landing of a floor is cancelled only when the car indicated on the guide lamp at the landing to serve that landing or a car running in an immediately adjacent hoistway arrives at the floor, whichever earlier.
  • FIG. 1 is a diagram for explaining the operation of an elevator group control system according to an embodiment of the invention
  • FIGS. 2 to 13 show an actual example of the invention as applied to an elevator system comprising three cars A, B and C serving lst to 10th floors, among which;
  • FIG. 2 is a diagram showing a detection circuit provided for car A for detecting the spatial interval between car A and the succeeding car. a like circuit being provided for each of the other cars;
  • FIG. 3 is a diagram showing a circuit for detecting the number of calls to be answered by car A, a like circuit being provided for each of the other cars;
  • FIG. 4 is a diagram showing a circuit for counting an average number of calls to be served by each of cars A to C;
  • FIG. 5 is a diagram showing a reference voltage generator circuit used with the comparator shown in FIG.
  • FIG. 6 shows a circuit for determining the time interval between car A and other cars, a like circuit being provided for each of the remaining cars;
  • FIG. 7 is a diagram showing a circuit for determining the service zone of car A, a like circuit being provided for each of the remaining cars;
  • FIG. 8 is a circuit provided for each floor for prohibiting the answering to a hall call subsequent to the determination of which car to serve the hall call;
  • FIG. 9 is a circuit provided for each floor for determining the order in which the three cars are to answer a hall call from that floor;
  • FIG. 10 is a diagram showing a circuit provided for car A for making a decision to serve a hall call for car A, a like circuit being provided for each of the other cars;
  • FIG. 11 is a diagram showing a circuit for driving a guide lamp for car A, a like circuit being provided for each of the other cars;
  • FIG. 12 is a diagram showing an embodiment of a detection circuit specific to the present invention for detecting the direction of travel of car A and the nature of a hall call for car A, a like circuit being provided for each of the other cars;
  • FIG. 13 is a diagram showing an embodiment of the reset circuit specific to the invention for registration and cancellation of a hall call, a like circuit being required for each of the other cars;
  • FIG. 14 is a diagram showing another embodiment of the circuit for detecting the direction of travel of car A and the nature of a hall call therefor. a like circuit being provided for each of the other cars;
  • FIG. 15 is a diagram showing a circuit provided for each floor for energizing a guide lamp for each car group.
  • the diagram of FIG. 1 is for explaining the operation of the group control system used with an elevator system comprising cars A to C serving the first to 10th floors.
  • the purpose of a group control system is to effi ciently control the operation of all the cars included in the system by systematically relating the cars to each other. To achieve this purpose, such factors concerning the operating conditions of the cars as the intervals between cars and the number of floors to be served by each car are detected to equalize them as far as possible. Further, a service zone of each car which covers the floors expected to be served by the particular car in response to hall calls from such floors is determined and changed at each moment in accordance with the operating condition of the car.
  • a hall call originating from a floor is transmitted to a car having the service zone covering that floor, requiring it to serve the floor.
  • the service Zone of a car is an important factor in making decision that that car is required to answer a hall call originating from within that service zone.
  • the service zone will be explained more in detail with reference to FIG. 1.
  • car A is traveling up at the second floor
  • car B traveling down at the ninth floor
  • car C traveling down at the second floor.
  • the service zones of the cars include the floors as indicated by arrows respectively.
  • the hall call the origin of which is included in the service zone of car A is transmitted to the control device for car A, so that it is determined that car A is required to serve the hall call.
  • the car which was specified to serve the hall call is indicated on the guide lamp on the floor from which the hall call was originated, thus informing the prospective passenger which of the cars is to serve him.
  • An interval means a spatial interval between the physical positions of two given elevator cars and/or time interval based on the number of floors to be served.
  • a position signal means a signal representing physical or actual position expressed in the form of the floor number or distance and/or a provisional position which is in advance of the corresponding actual position. For instance, the provisional position of a car traveling up at the third floor may be the fourth, fifth and sixth floor depending on whether it is running at low, medium or high speed, respectively.
  • reference symbols FIUA to F9UA show position signals for car A in up travel indicating the first to ninth floors respectively, symbols F2DA to FlODA position signals for car in down travel indicating the second to 10th floors respectively, symbols FlUB to F9UB position signals for car B in up travel indicating the first to ninth floors respectively, symbols F2DB to FIODB position signals for car B in down travel indicating the second to 10th floors, symbols FlUC to F9UC position signals for car C in up travel indicating the first to ninth floors, symbols F2DC to FlODC position signals for car C in down travel indicating the second to 10th floors respectively, sybmols OlUAl to 09UA2 and 02DAl to 010DA2 OR" elements, symbols IlUA to I9UA and I2DA to llODA inhibit elements, symbols r and r resistors and symbol du a signal indicating the spatial interval between car A and the succeeding car.
  • the service floors FlU, F2D, F3D. F9D. F10D. F9U, F8U F2U and FlU are endlessly connected, through which position signals FIUA to F9UA and F2DA to FlODA are transmitted in sequence until they are interrupted by either a position signal of car B or that of car C when signal da representing an spatial interval is obtained from signals from each floor and the resistors r, and r It is assumed now that car A is traveling up at the eighth floor, car B traveling up at the second floor and car C traveling down at the fifth floor, ear B suceeding car A.
  • Position signal F8UA of car A is applied through F8UA, 08UA1, I8UA, 07UA1 I3UA, 02UA1 and I2UA in that order.
  • Position signal F2UB of car B which is in the state of l is applied through 02UA2 and I2UA thereby to prevent the output from being produced by the inhibit element I2UA, so that no signal is applied to the following stages.
  • inhibit elements I8UA, I7UA I4UA and I3UA produce 1 signals and a signal corresponding to the position signal representing the six floors is produced across the resistor r through the resistors 2', connected to the abovementioned inhibit elements, which signal constitutes signal da.
  • a signal in proportion to the number of floors is produced across the resistor 1'
  • reference symbols MlUA to M9UA and M2DA to MlODA are signals representing the floors to be served by car A, among which those signals corresponding to hall calls or cage calls which have been generated are converted into the state of 1.
  • signal CA proportional to the number of calls to be served is obtained through the resistors r and r,,.
  • the circuit of FIG. 4 is provided for the purpose of calculating the average number of hall calls for each car by the calculating processes of addition and division of the number of hall calls to be served by each car.
  • Reference symbols CA to CC show signals representing the number of calls to be served by cars A to C respectively as calculated by the circuit of FIG. 3., and symbols NOAl, NOA2, NOBI, N082, NOCI and NOC2 contacts adapted to be opened when cars A to C are released from controlled operation respectively.
  • Symbol R shows an operational resistor and OP, an operational amplifier through which the polarities of input and output are reversed.
  • FIG. 6 a circuit for determining the interval between car A and other cars, to which signals are applied from the circuits of FIGS. 2 to 5.
  • reference symbols OPAl and OPA2 show operational amplifiers, symbols CMAl and CMA2 comparators each producing a 1 signal when the sum of the two inputs thereto is zero or positive, symbol NA a NOT element, symbol Il-I an inhibit element and symbols EOA to E2A instruction signals to advance the position of car A to a provisional position. signals EOA, EIA and E2A instructing the position of car A to be advanced by zero, one and two floors provisionally, respectively.
  • the spatial interval between car A and a succeeding car is six floors and the number of hall calls for car A is more than the average number of hall calls by one.
  • the comparator CMAI which receives the reference voltage of 5 volts in addition to the input of 3 volts produces a 1 signal
  • the comparator CMA2 on receipt of the reference voltage of 4 volts in addition to the input of -3 volts also produces a 1 signal.
  • the instruction signal E2A to advance the car position becomes 1, while the instruction signals EIA and EOA are both brought into the state of because the inhibit element IH produces no output on one hand and a 1 signal is applied to the NOT element NA on the other.
  • FIGS. 7 to 9 show a circuit for determining the service zone of car A on the basis of the position signal and interval signal obtained for car A.
  • reference symbols AlUAl to A9UA3 and A2DA1 to A10DA3 show AND elements, OIUA3 to O9UA5 and O2DA3 to OIODAS OR elements, IN- lUAl to IN9UA3 and IN2DA1 to IN10DA3 inhibit elements, symbols 1U to 9U and 2D to 10D inhibition signals produced from the OR elements as shown typically in FIG. 9, symbols MlU to M9U and M2D to MlOD inhibition signals typically produced as shown in FIG. 7, symbols LIUA to L9UA and L2DA to LIODA signals representing service zones of car A and are applied to the circuit of FIG. 10.
  • the signal from the OR element O2UA3, on the other hand, is applied to the OR element O2UA4 and produced from the circuit as shown in FIG. 9 in the form of inhibition signal 2U. Under this condition. only the output from the OR element O2UA3 is applied to the OR element O2UA4 for car A, from which the signal is applied to the OR element O2UB4 and the inhibit element IN2UB2, while the output of the OR element O2UB4 is applied to the OR element O2UC4 and inhibit element IN2UC2 for car.
  • the output signal from the OR element O2UC4 is transformed into the inhibition signal 2U, which is applied to the inhibit elements IN2UA1, IN2UB1 and IN2UC1 as an inhibition input thereto as shown in FIG. 7.
  • the inhibit elements IN2UA2, IN2UB2 and IN2UC2 are prohibited from producing their outputs in that or order of priority.
  • the signal from the OR element O2UA3 for car A becomes 1 and is applied as an inhibition signal 2U to the inhibit element IN2UCI to put the output of the inhibit element O2UA3 into the state of 0. v I
  • the down travel of car B at the 10th floor causes the inhibition signal 10D to become 1, so that the output of the inhibit element INIODAI for car A is brought into the state of O.
  • the output signals L2UA to L9UA from the inhibit elements IN2UA3 to IN- 9UA3 become I.
  • These signals L2UA to L9UA represent the service zone of car A covering the second floor up to the ninth floor up.
  • the service zones of cars B and C respectively include the 10th floor down to the sixth floor down and the fifth floor down to the first floor up.
  • Singlas LlUA to L9UA and L2DA to LlODA thus obtained are applied to the circuit of FIG. 10 for deciding on the response to hall calls, for car A.
  • the signals LlUA to L9UA and L2DA to LIODA in combination with hall calls cause the response decision relays RylUA to Ry9UA and Ry2DA to RylODA to be energized through the amplifier elements RIUA to R9UA and R2DA to RlODA respectively.
  • Contacts HC1Ua2 to HC9Ua2 and HC2DUa2 to HCl0DUa2 are closed by the registration of corresponding hall calls.
  • FIG. 11 shows a guide lamp energizing circuit provided for the purpose of informing the prospective passenger of expected car service by turn ing on the guide lamps SIUA to S9UA and SZDA to SlODA on the landings of the floors in response to the energization of relays RylUA to Ry9UA and Ry2DA to RylODA respectively.
  • FIGS. 12 and 13 which incorporate the features of the invention.
  • the circuit of FIG. 12 is for determining, in response to a hall call or cage call, the direction of travel of car A and the nature of a call generated at the time of deceleration and stoppage, while the circuit shown in FIG. 13 is for registration and cancellation of a hall call for car A, similar circuits being required for cars B and C as will be easily noted from the description which will be made later.
  • reference symbol PN shows a DC power supply
  • symbol UDA a relay for deciding on the up travel of car A
  • symbol DDA a relay for deciding the down travel of car A
  • symbol CSTA a relay for detecting the stoppage of car A in response to a cage call
  • symbols USTA and DSTA relays turned on by the stoppage of car A in response to a hall call during its up and down travel respectively
  • symbols rlU to r9U and r2D to rlOD resistors symbols HlU to H9U up hall call buttons provided at the first to ninth floors respectively, symbols H2D to HIOD down hall call buttons provided at the second to th floors respectively, symbols I-IClU to HC9U and HCZD to HClOD call registration relays energized in response to the operation of the hall call buttons HlU to H9U and H2D to HIOD respectively, symbols HClUa to I-IC9Ua and HCZDa to I-IClODa contacts of the call registration relays I-IClU to HC9U and I-IC2D to HClOD respectively, and symbol No. B, C the fact that similar hall call registration cancellation circuits for cars B and C are not shown in the drawing.
  • the up travel decision relay UDA is turned on through the formation of a loop comprising P, DNAb, UDA, FIOAbl, Fl0Ab2, F10Ab3, F9Ab1, F9Ab2, C9A and N.
  • the cage call service relay CSTA is turned on through P, STA, CSTA, F9Aa2, C9A and N and selfheld through P, STA, CSTA, CSTAa and N, thereby deciding that the ninth floor is being served in response to the cage call.
  • the relay USTA or DSTA is turned on respectively, thus recognizing the nature of the call issued at the time of car deceleration, as will be described more fully later.
  • the hall call registration relay HC9U is turned on through the loop consisting of P, r9U, HC9U, H9U and N and selfheld through the loop consisting of P, r9U, HC9U, HC9Ua, and N at the press of the hall call button H9U for up travel at the ninth floor.
  • car A has the service zone of up travel covering the 2nd to 9th floors and signals L2UA to L9UA in FIG. 6 are l.
  • the formation of the loop comprising L9UA, R9UA, Ry9UA, HC9Ua and P in FIG. 10 causes the response decision relay Ry9UA to be turned on, so that the guide lamp S9UA of FIG.
  • the up travel decision relay UDA for car A is turned on through the loop comprising P, DNAb UDA, FlOAa FlOAb Fl0Ab F9Ab Ry9UAa and N thereby to detect the presence of a hall call issued from an upper floor.
  • the up hall call service relay USTA When car A moves up farther and is decelerated in response to a signal from the response decision relay Ry9UA, the up hall call service relay USTA is turned on through the loop consisting of P, STA, DNAb USTA, DSTAb, F 9Aa,, Ry9UAa and N and self-held by way of the loop consisting of P, STA, DNAb USTA, DSTAb, USTAa, and N.
  • the coils of the call registration relay HC9U With the energization of the up hall call service relay USTA, the coils of the call registration relay HC9U are short- IJI circuited by way of the loop comprising P, r9U, F9Aa,, USTAaand N.
  • the call registration relay HC9U is turned off thereby to de-energize the response decision relay Ry9UA shown in FIG. 10. In other words, upon completion of service to the prospective passenger by the car indicated to him, the registered hall call by him was cancelled.
  • the registration cancellation circuits for cars B and C the presence of which is shown by symbol No. B, C in FIG. 13 comprises, like the registration cancellation circuit for car A or the circuit for short-circuiting the call registration relays HClU to HC9U and HCZD to HC 10D, contacts of position detecting relays and contacts of up hall call service relays and down hall call service relays.
  • a hall call remains registered until the car the expected service of which is indicated to the prospective passenger in response to the hall call has arrived at the floor on which he is waiting. It does not matter whether the prospective passenger actually takes car A or not. But the important thing is to assure him that car A will stop at his floor without fail for his service.
  • This offers a big advantage of superior elevator service taking into consideration the psycological state of the prospective passenger. Repeated changes in the car service schedule at a given floor is an adverse factor in the car arrival forccasting system, giving rise to disbelief on the part of prospective passengers. Such disadvantage is obviated by the present invention.
  • FIG. 14 Other embodiments of the circuit for determining the direction of travel of car A and the circuit for determining the nature of a call issued during the deceleration and stoppage of car A are disclosed in FIG. 14. Unlike the preceding embodiment in which the registration of a hall call is cancelled only by the deceleration and stoppage of a car the expected service of which is indicated to the prospective passenger in response to the hall call, the embodiment under consideration is such that the deceleration and stoppage of the car involved or a car in the adjacent hoistway, whichever arrives earlier, causes the registration of the hall call from that floor to be cancelled.
  • the loop comprising P, STA, DNAb, USTA, DSTAb, F9Aa Ry9UBa and N is formed thereby to energize the up hall call service relay USTA.
  • the cancellation loop comprising P, r9U, F9Aa USTAa and N as shown in FIG. 13 is formed thereby to reset the hall call registration relay HC9U, and the response decision relay Ry9UB for car B is also reset to prevent car B from stopping at the ninth floor.
  • the circuit shown in FIG. 15 is provided for the purpose of turning on a guide lamp common to a group of cars.
  • a guide lamp S2UAB common to cars A and B is provided for up travel at the second floor, a like guide lamp being required for each floor for each direction of travel.
  • Reference symbols Ry- 2UAa to RyZUCa show contacts of the response decision relays RyZUA to RyZUC for cars A to C respectively.
  • the guide lamp used in this case has the functions to forecast the arrival of either car A or car B, and therefore the guide lamp must be reset upon completion of service by car A or B, while it is required to be maintained ON even if a car other than cars A and B arrives at the calling floor.
  • the present invention is obviously applied with equal effect to such case as mentioned above. Even though the circuit of FIG. 14 is directly applied to a car group including a couple of cars, the application of the same circuit to a group involving more than two cars requires parallel provision of additional response decision relay contact.
  • a service zone for each car is defined, a car to respond to a hall call specified and then a common guide lamp for the group including the specified car is turned on thereby to inform the prospective passenger of the expected arrival of the car. It is not necessary, however, to specify a car to respond to a hall call, but it suffices only if a car group ready to serve the hall call is determined to turn on the common guide lamp for that group.
  • the present invention is applied with equal effect to every elevator system comprising a plurality of cars or car groups serving a plurality of floors.
  • circuit for recognizing the nature of a call and the circuit for registration and cancellation of a hall call to achieve the objects of the invention are not confined to those mentioned above but may be presented in various forms.
  • the present invention is not limited to such group control system but may be applied with equal effect to a system in which the circuits of FIGS. 2 to 6 are omitted and the position advancing signals EOA to E3A are not figured out.
  • the position signals FIUA to F9UA and F2DA to FIODA for car A are directly applied to the OR elements OlUA3 to O9UA3 and O2DA3 to OIODA3 shown in FIG. 7.
  • the invention is applied to a case in which instead of specifying a car on the basis of the service zone thereof, a car situated the nearest to the calling floor is specified as a car to answer the hall call from that floor and indicated on the guide lamp on that floor.
  • An elevator control system comprising a plurality of elevator cars serving a plurality of floors, means for registering a hall call from a prospective passenger, means responsive to said registering means for selecting a car or car group to answer said hall call, means for directing said selected car to proceed to and stop at the floor from which the hall call originated, means responsive to said selecting means for informing a prospective passenger waiting on the landing of a floor at which the specified car or car group will respond to the hall call from the prospective passenger, means for detecting the deceleration or stoppage of the car selected by said selecting means at the floor from which the hall call was originated, and means for cancelling the registration in said registering means of said hall call from said floor only in response to said detector means detecting deceleration or stoppage of that car at said floor.
  • said means for detecting the deceleration or stoppage of a car the expected service of which the pro speetive passenger waiting at the calling floor is informed of includes for each car, means for detecting the floor where the car is deeelerated and means for detecting floors the hall call from which the ear is required to answer, and AND means to which the outputs from said two means are applied.
  • An elevator control system in which said means for detecting the deceleration or stoppage of a specified car includes means for detecting the deceleration or stoppage of a car in the hoistway adjacent to that of a car the expected service of which the prospective passenger waiting at the floor from which the hall call was originated is informed of.
  • said means for detecting the deceleration or stoppage of a car in the adjacent hoistway includes for each car a means for detecting the floor where the car is deeelerated and means for detecting floors the hall call from which the car in the adjacent hoistway has responded, and AND means to which the outputs from said two means are applied for logical operation.
  • An elevator control system in which said means for detecting the deceleration or stoppage of a specified car includes means for detecting the deceleration or stoppage of the specified car or a car in the adjacent hoistway.
  • said means for detecting the deceleration or stoppage of cars includes means for detecting the floor the hall call from which was answered by the specified car and means for detecting the floor the hall call from which the car in the adjacent hoistway has answered, OR means to which the outputs from said two means are applied, means for detecting the floor at which one of said cars is deeelerated or stopped, and AND means to which the outputs from the last-mentioned detector means and said OR means are applied.
  • said means for detecting the deceleration or stoppage of a specified car includes means for detecting the deceleration or stoppage of a car included in the car group of which the prospective passenger waiting at the calling floor is informed.
  • said means for detecting the deceleration or stoppage of a car includes means for detecting the floor at which the car included in the car group is decelerated or stopped and means for detecting the floor the hall call from which the car group has responded, both of said floor detecting means being provided for each car group, and AND means to which the outputs from said two detector means are applied.

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  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Elevator Control (AREA)
US414353A 1972-11-20 1973-11-09 Elevator control system Expired - Lifetime US3902571A (en)

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JP11552572A JPS5417218B2 (ja) 1972-11-20 1972-11-20

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JP (1) JPS5417218B2 (ja)
AU (1) AU456995B2 (ja)
BR (1) BR7309000D0 (ja)
CA (1) CA998787A (ja)
GB (1) GB1453080A (ja)
HK (1) HK27077A (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4064971A (en) * 1975-05-12 1977-12-27 Hitachi, Ltd. Elevator service information apparatus
US4691808A (en) * 1986-11-17 1987-09-08 Otis Elevator Company Adaptive assignment of elevator car calls
US8151943B2 (en) 2007-08-21 2012-04-10 De Groot Pieter J Method of controlling intelligent destination elevators with selected operation modes

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS587594B2 (ja) * 1979-07-30 1983-02-10 株式会社日立製作所 エレベ−タ信号制御装置
JPS571181A (en) * 1980-06-03 1982-01-06 Mitsubishi Electric Corp Annunciator for platform of elevator
JPS5725970U (ja) * 1980-07-18 1982-02-10

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3474885A (en) * 1967-01-20 1969-10-28 Reliance Electric Co Queueing controls for a group of elevators
US3739880A (en) * 1971-06-10 1973-06-19 Reliance Electric Co Elevator control for optimizing allotment of individual hall calls to individual cars

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3474885A (en) * 1967-01-20 1969-10-28 Reliance Electric Co Queueing controls for a group of elevators
US3739880A (en) * 1971-06-10 1973-06-19 Reliance Electric Co Elevator control for optimizing allotment of individual hall calls to individual cars

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4064971A (en) * 1975-05-12 1977-12-27 Hitachi, Ltd. Elevator service information apparatus
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
US8151943B2 (en) 2007-08-21 2012-04-10 De Groot Pieter J Method of controlling intelligent destination elevators with selected operation modes
US8397874B2 (en) 2007-08-21 2013-03-19 Pieter J. de Groot Intelligent destination elevator control system

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HK27077A (en) 1977-06-10
CA998787A (en) 1976-10-19
JPS4972854A (ja) 1974-07-13
AU456995B2 (en) 1975-01-16
GB1453080A (en) 1976-10-20
AU6252273A (en) 1975-01-16
JPS5417218B2 (ja) 1979-06-28
BR7309000D0 (pt) 1974-08-22

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