EP3325390B1 - Method for operating a lift system, and lift system - Google Patents

Description

The invention relates to a method for operating an elevator system with a shaft system and a plurality of elevator cars. The elevator cars are moved separately from one another between floors in a circulating operation. The elevator cars are moved in such a way that the elevator cars are moved upwards in a first shaft and are moved downwards in a second shaft.

The invention further relates to an elevator system with a shaft system, a plurality of elevator cabs that can be moved in the shaft system and a control device for operating the elevator system.

High-rise buildings and buildings with a large number of floors require complex elevator systems in order to handle all transport processes as efficiently as possible. In particular, at peak times it can be the case that a large number of people want to be transported from the ground floor of a building to the different floors of this building. In other rush hours, for example, there is a need to transport a large number of people from the different floors to the ground floor.

Elevator systems for such purposes are known, in particular also so-called multi-car systems, which are an elevator system with a plurality of cars that can be moved separately from one another, that is to say largely independently of one another, in a shaft system. Methods known in the prior art for operating such an elevator system provide inter alia so-called circulating operation. This means that, as with a paternoster, the elevator cars are moved upwards in one shaft and are moved downwards in another shaft. Such an elevator system is for example in the publication JP H05 97353 A described, wherein the elevator cars of this elevator system are driven by means of a linear motor. However, since the elevator cabs are to be moved separately from one another in modern multi-car systems operated in circulation operation, in particular in order to be able to transport a larger number of people more quickly to a desired floor and to realize short waiting times for the users, the problem arises of moving the elevator cabs appropriately.

This can lead to traffic jams in multi-car systems operated in circulation. This is because several cars are moved in the same shaft and cannot pass each other. Since the elevator cabs in stops, in particular due to the number of people entering and / or alighting at the respective stop, have to hold for different lengths of time and thus have different stopping times, without suitable countermeasures, the following elevator cabs will follow a preceding one Elevator car run up or can run up. Such a traffic jam generally resolves itself again at most slowly and leads to longer waiting times for the people to be transported as well as to delay times in the onward journey of cabins occupied by people. Long waiting and delay times are perceived by people as particularly annoying and uncomfortable.

In addition, such a traffic jam increases the so-called "bunching effect". Because the elevator car driving ahead is fully loaded with waiting passengers. There are fewer waiting passengers for the elevator car that follows shortly thereafter. As a result, the stopping time of this elevator car is shorter, which means that it continues to be "held up" by the car traveling ahead. In the pamphlet JP H08 282926 A An elevator installation with a multi-car system operated in circulation is disclosed, in which a simultaneous entry / exit at stops is proposed to improve the transport capacity.

A further problem with multi-car systems operated in circulation is the occurrence of energy peaks, in particular in multi-car systems in which the elevator cars are operated with linear motors. Since there are no ropes and counterweights in these last-mentioned multi-car systems, all of the energy must be introduced by the linear motor for the acceleration of the elevator car to be moved upwards. If, for example, several elevator cars are to be moved upwards at the same time without further elevator cars being moved downwards, then a very high energy requirement and a very high power consumption from the network feeding the multi-car system are necessary.

Against this background, it is an object of the invention to provide a method for operating an elevator system with a shaft system and a plurality of elevator cars, which are moved separately from one another between floors in a circulating operation, in such a way that that the lifts are moved upwards in a first shaft and are moved downwards in a second area. The method is to be improved in particular in such a way that the formation of congestion is avoided as far as possible. Waiting times for people using the elevator system should also advantageously be as possible be kept low. In addition, an elevator system that is improved in terms of operation is to be provided.

To achieve the object, a method for operating an elevator system and an elevator system according to the independent claims are proposed. Advantageous further developments and refinements are proposed in the dependent claims and in the description.

The proposed solution provides a method for operating an elevator system which comprises a shaft system and a plurality of elevator cars. The elevator cars are moved separately from one another between floors in a circulating operation. Moving separately from one another means, in particular, that elevator cars can be moved simultaneously at different speeds; in particular, some elevator cars cannot be moved while other elevator cars are moved. The elevator cars are moved in circulation operation in such a way that the elevator cars are moved upwards in a first shaft and are moved downwards in a second shaft. The first shaft and the second shaft can each also be areas of a shaft. In particular, it is also provided as an embodiment variant that the elevator cars are moved upwards in several shafts and are moved downwards in several further shafts. According to the invention, it is further provided that the movement of the elevator cabs is synchronized with respect to defined shaft positions that can be approached by the elevator cars, the number of defined shaft positions at least corresponding to the number of elevator cars. As a result of this synchronization, a minimum distance, particularly advantageously a minimum time interval, is advantageously maintained between two elevator cars. A movement of the individual elevator cars is thus advantageously carried out with respect to certain shaft positions, taking into account all of the other elevator cars. During the synchronization of the elevator cabs, at least one action relating to the movement of the elevator cabs is advantageously carried out with respect to the shaft positions, which action advantageously transfers the elevator system to a predetermined or predeterminable state. In particular, it is provided as a possible embodiment variant that the elevator cars are brought into defined positions immediately by means of a so-called “reset” synchronization. This lets advantageously ensure compliance with a minimum time interval between the elevator cars.

The elevator cars do not necessarily have to stop or stand at the defined shaft positions. Rather, the elevator cabs can be in different operating phases at the shaft positions, for example in a deceleration phase or an acceleration phase or a holding phase.

Advantageously, individual or smaller groups of elevator cars, in particular groups of elevator cars comprising three or four elevator cars, can be excluded from the synchronization. Such an advantageous embodiment is provided in particular for elevator systems in the so-called "high rise" area, especially when these individual elevator cabs are not moved, for example due to a missing call request, and the distance to subsequent elevator cabs clearly exceeds a safety distance to be maintained between elevator cabs. The safety distance is clearly exceeded in particular when at least one free stop is located between an elevator car and the elevator car following this elevator car.

An advantageous embodiment of the method provides that the shaft positions are defined once. This one-time definition is preferably carried out before the elevator car is moved for the first time. If the elevator system is decommissioned, for example the elevator system is switched off at night, it is provided according to one embodiment that the shaft positions are again defined before the elevator system is restarted. Defining shaft positions once has the advantage that the control unit of the elevator system, which controls the implementation of the synchronization of the movement of the elevator cabs with respect to the defined shaft positions, can be designed more simply.

A further advantageous embodiment of the method according to the invention, on the other hand, provides that the shaft positions with respect to which the synchronization of the movement of the elevator cars is carried out are each redefined after the occurrence of at least one predetermined event. As a result, the method can advantageously be dynamically adapted to changed operating conditions of the elevator system. In particular, it is provided that the inward and / or outward transfer of elevator cars into the Circulating operation is such a predetermined event. When transferring elevator cabs, additional elevator cabs are introduced for moving in the shaft system of the elevator system, for example via a depot shaft, in which elevator cabs are discharged and can be quasi parked when the elevator system is not being used. Another predefined event is preferably the expiry of a predefined time interval, so that, for example, the shaft positions with respect to which the synchronization is to be carried out are redefined every 10 seconds. According to this embodiment, the shaft positions can thus advantageously be defined as a function of time. Further predefined events are advantageously previously detected possible operational disruptions and / or exceeding predicted stopping times during a stop of an elevator car at a stop.

In particular, the invention provides that the synchronization of the movement of the elevator cars is carried out in such a way that the elevator cars are operated in the same operating state at the defined shaft positions. Operating states of an elevator car are in particular braking of an elevator car or acceleration of an elevator car or stopping of an elevator car.

According to a further advantageous embodiment of the method according to the invention, it is provided that the elevator cars are each moved according to a travel curve. To synchronize the movement of the elevator cars, the respective travel curves are advantageously adapted, in particular taking into account at least one operating parameter of the elevator system, preferably at least taking into account the positions of the elevator cars in the respective shaft. In particular, it is provided that a travel curve adapted for this elevator car is generated for each elevator car. The travel curves of the elevator cars are advantageously generated on the basis of input values. These input values include, in particular, a speed to be achieved by the elevator car, the acceleration or deceleration of this elevator car, and the so-called jerk, that is to say a change in the acceleration or the deceleration over time. In particular, a change in the jerk is provided as a further input value. Different travel curves for the respective elevator cars and / or an adaptation of the input values for the respective elevator car based on the respective elevator car are advantageously used for the synchronization and to enable individual stopping times of the elevator cars, in particular more individual ones Stop times in the stops, used. The adaptation of the travel curves of the elevator cabs for the synchronization of the elevator cabs is advantageously carried out before an elevator cab is traveling and also while an elevator cab is traveling. In particular, however, it is also provided that the adaptation of the travel curve takes place before the travel of an elevator car or during the travel of an elevator car.

Adjustments to the travel curves of the elevator cars also take place in particular due to different vertical distances between the stops ahead. Because the different vertical distances result in different arrival times with the same input values of the travel curve. In order to achieve synchronized arrival times for synchronized starts, for example, the input values of the travel curves of the individual elevator cars are advantageously coordinated with one another in such a way that the elevator cars arrive at the next stop at the same time.

Another advantageous embodiment of the method according to the invention provides that stops of the elevator system are defined as the shaft positions. The fact that the elevator cabs usually only stop at stops during normal operation of the elevator system, that is to say when there is no fault in the elevator system, in particular in order not to cause any irritation to the passengers is advantageously used here. So that the times from when an elevator car leaves one stop until the next elevator car enters this stop is particularly well adapted to the usage requirements of the elevator system, and long waiting times are avoided, especially when there are high numbers of people, the definition of stops as the shaft positions is related to that the synchronization is carried out is particularly advantageous. In particular, for the explicitly intended operation of the elevator system, in which fewer elevator cars are moved in the shaft system than there are stops, a subset of stops is advantageously determined, only the stops of this subset being defined as shaft positions. This determination is advantageously made as a function of the situation, in particular as a function of the occurrence of at least one predefined event. In particular, the current positions of the elevator cars are provided as predetermined events.

In the method according to the invention, one of the defined shaft positions is advantageously assigned logically to one of the elevator cars. Thus becomes advantageously, in particular for each of the elevator cars, it is clearly defined with regard to which shaft position the synchronization of the movement of this elevator car takes place.

According to a further advantageous aspect, it is provided that the defined shaft position to be reached next in the direction of travel of an elevator car is logically assigned to the respective elevator car. According to an advantageous embodiment, this shaft position is the next stop to be approached by the elevator car. Because, according to this advantageous embodiment, the defined shaft position to be reached next by the elevator car is logically assigned to the respective elevator car, good predictability of the elevator system is advantageously achieved. In addition, it is advantageously possible to react quickly to the occurrence of unforeseen events, such as a malfunction.

According to a further advantageous embodiment of the method according to the invention, it is provided that current positions of the elevator cars in the respective shaft are defined as the shaft positions at defined time intervals. In this embodiment, one elevator car is advantageously logically linked to the current position of the elevator car ahead of this elevator car. The synchronization of the movement of the elevator cars is preferably carried out in each case with respect to the shaft positions logically linked to the respective elevator cars. The time intervals can advantageously be adapted to the number of people to be transported. The number of elevator cars used in the elevator system can also advantageously be adapted to the number of people to be transported. With these refinements, a current traffic volume is advantageously taken into account in an improved manner and adapted to an increased transport requirement in an improved manner. In particular, a time interval between 5 seconds and 120 seconds is provided as the time interval. The time interval is preferably selected to be smaller, the more elevator cars are moved per shaft section.

According to a further advantageous embodiment of the invention, the synchronization of the movement of the elevator cars with respect to the defined shaft positions is carried out in such a way that all elevator cars reach the defined shaft positions at the same time. In particular, it is provided here that stops of the elevator system are defined as the shaft positions. The movement of the elevator cars is advantageously synchronized in such a way that all of them are synchronized Integrated elevator cabins, which are moved in the shafts of the shaft system, reach the shaft positions defined by the stops at the same time. In this embodiment, all of the elevator cabins integrated into the synchronization advantageously enter the respective stop defining a shaft position at the same time. There is thus an arrival synchronization with regard to reaching a stop. In this case, the travel curves are advantageously changed by adapting the input values in such a way that the elevator cars arrive at their next stop at the same time. In particular, it is provided that the elevator cars are moved further individually according to their respective holding times, which can be of different lengths for the elevator cars. This means that the respective stops are left independently of one another in this embodiment. The arrival time common to the elevator cars at a respective defined shaft position, in particular at a stop as a defined shaft position, is advantageously used to determine suitable input parameters or operating parameters for the travel curve. Advantageously, anticipated holding times and / or anticipated remaining holding times of the individual elevator cars are taken into account.

In addition or as an alternative to this, a further advantageous embodiment of the method according to the invention provides that, with regard to the defined shaft positions, the synchronization of the movement of the elevator cars is carried out in such a way that all elevator cars involved in the synchronization leave the defined shaft positions at the same time. In this case, stops of the elevator system are advantageously defined as the shaft positions with respect to which the synchronization is carried out. A start synchronization of the elevator cars with regard to leaving the respective defined shaft positions is thus carried out, in particular with regard to leaving the stops as defined shaft positions. It is advantageously provided that with a predicted stopping time of an elevator car that is significantly shorter than the predicted stopping times of the other elevator cars, the arrival of this elevator car at the next defined shaft position, in particular the next stop, is delayed by adapting the travel curve of this elevator car. This can take place in particular during the movement of this elevator car to the stop, but in particular also before the movement of the elevator car. As a result of the late arrival and the short stopping time that can be achieved in this way, a synchronized start of the elevator cabs can advantageously be implemented when the elevator cabs are moved further, with the advantage that no additional stopping times arise.

An advantageous development of the method according to the invention provides that, with regard to the defined shaft positions, the synchronization of the movement of the elevator cars is carried out in such a way that a period of time, i.e. a time interval, is specified in each case, with the elevator cars first determining the shaft position of the elevator car traveling ahead in the respective shaft after this time has elapsed. The exact time period advantageously represents a minimum time interval between the elevator cars. The synchronization is advantageously carried out by adapting the travel curves of the elevator cars accordingly, in particular by adapting the travel curves before departure after an elevator car has stopped and / or while an elevator car is moving .

If stops are defined as shaft positions with respect to which the synchronization is carried out, this further development of the method according to the invention provides in particular that after an elevator car has entered a stop, the next elevator car enters this stop at the earliest after the specified time interval has elapsed. In particular, it is also provided that the synchronization of the movement of the elevator cabs is carried out in such a way that the elevator cabs reach the respectively defined shaft positions exactly when the predetermined time interval has elapsed.

In this case and / or in another embodiment of the invention, further method steps are preferably provided which ensure that the shaft position to be reached by an elevator car is not occupied by another elevator car. Such method steps are in particular provided that the doors of the elevator cars are closed either after a fixed predetermined time interval or preferably after a time interval adapted to the synchronization or a time interval predetermined by the synchronization. It is provided as a design variant that the doors initially close to half the passage width. In this way, the boarding of further people is advantageously prevented and further movement of the elevator car is not delayed any further.

In order to reduce irritation of people to be transported, the movement of the elevator cabs and / or the synchronization of the elevator cabs that takes place is advantageously displayed acoustically and / or visually for the passengers to be transported and / or transported. In particular, it is provided in this regard that a time and / or a Countdown is shown until the doors of an elevator car close and / or until an elevator car enters a stop and / or until an elevator car leaves a stop.

Such a representation is advantageously provided in the elevator car and / or outside the elevator car, in particular outside the elevator car in the entry or exit area of a stop. Furthermore, boarding information is advantageously provided for the user in the floors. In addition to the times mentioned, this boarding information advantageously also includes a signaling device, in particular a traffic light as a signaling device which regulates the boarding process.

A display, provided according to a further advantageous embodiment, of how many passengers can or may still get into the elevator car, advantageously contributes to a further improved orientation of the users of the elevator system. In particular, this advantageously increases the willingness of people to be transported to wait for the next car. A capacity display, which provides information about how many people can get into an elevator car, is advantageously carried out before the elevator car arrives and before the door to the elevator car opens. Advantageously, this capacity display also takes place during the boarding process and is updated accordingly.

As a further advantageous embodiment variant or further development of the method according to the invention, the synchronization of the elevator car process is carried out with respect to the defined shaft positions in such a way that, for an operating period of the elevator system, the elevator cars each reach the respective defined shaft positions at a predetermined point in time. As a result of this advantageous synchronization, a movement of the elevator cabs is achieved, as it were, according to a timetable. This means that, for example, it can be specified for an entire day when which elevator car reaches which shaft position. In order to adapt to a longer stop of one or more elevator cars, an adaptation of the predefined times is provided in the context of the synchronization, preferably such that the predefined times are adapted by a specific time interval. If, for example, a predetermined point in time for an elevator car to reach a certain shaft position 10:12:30 am, then a Delay of a stop of an individual elevator car, this point in time can be subjected to a time interval of 30 seconds as part of the synchronization, so that the new point in time is 10:13:00.

According to a further advantageous embodiment of the invention, the synchronization of the movement of the elevator cars is carried out with respect to the defined shaft positions in such a way that the elevator cars leave the respective defined shaft positions at a predetermined point in time for an operating period of the elevator system. This advantageous synchronization also advantageously results in a movement of the elevator cabs, as it were, according to a timetable, with it being specified here in particular when the elevator cabs each leave the stops as defined shaft positions. This means that, for example, it can be specified for an entire day when which elevator car leaves which shaft position, in particular which stop. In order to adapt to a longer stop of one or more elevator cars, an adaptation of the predefined times is provided in the context of the synchronization, preferably such that the predefined times are adapted by a specific time interval. If, for example, a predetermined time for leaving a certain shaft position is 08:22:00 for an elevator car, then if a stop of an individual elevator car is delayed, a time interval of 45 seconds can be added to this time as part of the synchronization, so that the new time 8:22:45 am.

A further advantageous embodiment provides that, with respect to the defined shaft positions, the synchronization of the movement of the elevator cabs is carried out in such a way that a period of time is specified for an operating period of the elevator system, the elevator cabs the shaft position of the respective preceding elevator car in the respective shaft only after expiry reach this length of time. The exact time period advantageously represents a minimum time interval between the elevator cars. Advantageously, the minimum time interval is smallest during periods of operation with a high volume of traffic, especially in the morning and / or at lunchtime, so that users have short waiting times for elevator cars.

Operating parameters with respect to each of the elevator cars are advantageously recorded. Each of the elevator cars is thereby preferably at least taking into account the to this Elevator cabin recorded operating parameters and proceeding taking into account the operating parameters recorded for the elevator cabin ahead of this elevator cabin. For an elevator car, such operating parameters are in particular the current position and / or the current speed and / or the current acceleration or deceleration and / or a currently determined waiting time for a stop. In particular, it is provided that safety distances that must always be maintained between successive elevator cars are taken into account during synchronization, so that the safety distance between elevator cars is never undershot when the elevator system is in operation.

According to a further particularly advantageous embodiment of the invention, holding times during which the respective car is not moved are predicted for each of the elevator cars and these predicted holding times are each recorded as one of the operating parameters. Expected holding times of an elevator car are predicted taking into account the load of the elevator car. The load advantageously allows conclusions to be drawn about the number of people in the elevator car. In particular, it is further provided that the number of people in the elevator cabs is recorded and taken into account in the prediction of the stopping times of the elevator cabs, particularly preferably with further consideration of call inputs issued by the persons, in particular destination call inputs. In this way, it is advantageously possible to estimate in a further improved manner how many people will get on and / or alight at a stop and how long the stopping time at the stop will be. The number of passengers waiting at a stop is advantageously estimated using destination call detection and / or monitoring systems, such as camera systems in particular. In particular, it is also provided that, for the prediction of stopping times, times of the day and traffic flows usually linked to these times of the day are taken into account. A traffic flow is preferably learned, and this learned traffic flow is also taken into account when predicting stopping times. In particular, stochastic methods are used to predict the holding times.

Since the downtimes of the individual elevator cars can sometimes turn out to be very different, a synchronization on the start or arrival of the car with respect to a stop is particularly advantageous, since this allows the synchronization to be maintained without further measures.

In a further advantageous embodiment of the invention, the elevator system has at least one relocating device for relocating elevator cars between shafts of the elevator system, the at least one relocating device being defined as the shaft position for an elevator car that has been relocated. Such relocation devices can be provided at the beginning and at the end of shafts in order to relocate the elevator cars from one shaft to the other. Transfer devices arranged between the beginning and the end of shafts have the advantage that the elevator car does not have to travel through the entire shaft in order to change the direction of travel of an elevator car.

Stops with relocating devices between two shafts can in particular have an access in each shaft. Due to a shorter distance to be covered between two shafts and due to the mechanical construction of the converter, it is advantageous to provide special treatment in the synchronization process for elevator cars in the horizontal movement in the converter and / or for elevator cars that enter a converter. In particular, an adaptation of the input values for the travel curve of an elevator car is provided if a relocating device is only able to "move in" an elevator car with a delay. Due to structural limitations of the converter with regard to the horizontal movement of an elevator car, the horizontal movement in the converter is advantageously adapted to the synchronization of the elevator cars to be moved vertically. In particular, it is provided that a converter with regard to the method according to the invention to the "outside" is viewed as a defined shaft position in which, when viewed "internally", there can be two or more cars. If, according to a further embodiment variant, the converter is arranged below a main stop, for example a stop below the main stop, or if several access stops are provided, the entire area below the main access level can also be part of this special treatment.

A further embodiment of the invention therefore provides that at least a partial area of the shaft system in which a subset of the elevator cars of the elevator system is located is excluded from the implementation of the synchronization. This advantageously creates the possibility of performing the synchronization for every second or every third stop. This results in a sub-area between these stops for which synchronization is carried out. In particular, a synchronization that is independent of the rest of the shaft system can be implemented within this sub-area take place, in particular a synchronization according to one or more of the above or below mentioned embodiments. An “internal” synchronization, so to speak, can thus advantageously be carried out in this at least one partial area.

In order to achieve the above-mentioned object, an elevator system with a shaft system, a plurality of elevator cars that can be moved in the shaft system and with a control device for operating the elevator system, in particular for controlling the movement of the elevator cars in the shaft system, is proposed, the control device being set up to operate the elevator system according to a method according to the invention in accordance with one or more of the aforementioned and / or below-mentioned configurations.

In particular, it is provided that the elevator system is a shuttle system. Such a shuttle system is, in particular, an elevator system by means of which users are moved to further passenger conveying devices, for example further elevator systems or escalators. In such shuttle systems, only certain transfer floors that have access to the further passenger conveying devices are approached. That is, the distance between adjacent stops can be several floors in particular.

If the distances between such transfer floors are large, so that a longer travel time for the process from one transfer floor to the next transfer floor arises, for example a travel time of ten seconds and more, then according to a further advantageous embodiment of the invention it is provided that the elevator cars in the elevator system are one assigned to a first group and a second group. It is advantageously provided that the first group of elevator cars is at a transfer stop while the second group of elevator cars is being moved. While the first group of elevator cars is accelerated from their transfer stops, the second group of elevator cars is advantageously decelerated.

If two revolving elevator systems are in operation next to each other, the elevator systems serving the same floors in shuttle mode, then it is advantageously provided that the elevator systems are also synchronized in such a way that the elevator cabs of one elevator system and the elevator cabs of the other elevator system are proceeded. This advantageously prevents a bunching effect between the circulating multi-car systems.

Fig. 1

in einer vereinfachten schematischen Darstellung ein Ausführungsbeispiel für ein erfindungsgemäßes Aufzugsystem;

Fig. 2

in einer vereinfachten schematischen Darstellung ein Ausführungsbeispiel für die Durchführung eines erfindungsgemäßen Verfahrens;

Fig. 3

in einer vereinfachten graphischen Darstellung ein weiteres Ausführungsbeispiel für die Durchführung eines erfindungsgemäßen Verfahrens;

Fig. 4

in einer vereinfachten graphischen Darstellung ein weiteres Ausführungsbeispiel für die Durchführung eines erfindungsgemäßen Verfahrens; und

Fig. 5

in einer vereinfachten graphischen Darstellung ein weiteres Ausführungsbeispiel für die Durchführung eines erfindungsgemäßen Verfahrens.

Further advantages, features and design details of the invention are explained in more detail in connection with the exemplary embodiments of the invention shown in the figures. It shows:

Fig. 1

in a simplified schematic representation an embodiment for an elevator system according to the invention;

Fig. 2

in a simplified schematic representation, an embodiment for carrying out a method according to the invention;

Fig. 3

in a simplified graphic representation, a further exemplary embodiment for carrying out a method according to the invention;

Fig. 4

in a simplified graphic representation, a further exemplary embodiment for carrying out a method according to the invention; and

Fig. 5

in a simplified graphical representation, a further exemplary embodiment for carrying out a method according to the invention.

In Fig. 1 an exemplary embodiment for an elevator system 1 is shown. In this exemplary embodiment, the elevator system 1 is a so-called shuttle system, by means of which users, in particular in so-called "high-rise buildings", are moved to further passenger conveying devices, in particular to further elevator systems and / or escalators. The elevator system 1 therefore has only a comparatively small number of floors 4 at which people can get on or off.

This in Fig. 1 The elevator system 1 shown by way of example comprises a shaft system 2 with a first shaft 5 and a second shaft 6. These shafts 5, 6 do not have to be structurally separate shafts. In particular, the first shaft 5 and the second shaft 6 can each form areas of a common shaft. In other configurations of the elevator system according to the invention, more than a first shaft 5 and a second shaft 6 are also provided in particular.

This in Fig. 1 The elevator system 1 shown also comprises several elevator cars 3 that can be moved in the shaft system 2 Fig. 1 The elevator system 1 shown has a relocation device 10 at its respective shaft system ends and in the middle area of the shaft system 2. By means of these relocating devices 10, elevator cars 3 can switch between the first shaft 5 and the second shaft 6. In particular, in the case of further advantageous design variants, several relocating devices are also provided between the ends of the shaft system 2 (in Fig. 1 not shown).

The in Fig. 1 Elevator system 1 shown in FIG Fig. 1 control device not explicitly shown. This control device is designed to operate the elevator system 1. In particular, the control device is designed to control the movement of the elevator cars 3. The elevator cars 3 are controlled in such a way that the elevator cars 3 are moved separately from one another between floors 4 in a circulating operation, the elevator cars 3 being moved exclusively upwards in a first shaft 5, which is shown in FIG Fig. 1 is represented symbolically by the arrow 8, and can only be moved downwards in a second shaft 6, which is shown in FIG Fig. 1 is represented symbolically by the arrow 9. Via the relocating devices 10, the elevator cars 3 are brought from the first shaft 5 to the second shaft 6 at the upper end of the shaft system 2 or from the second shaft 6 to the first shaft 5 at the lower end of the shaft system 2. The further transfer device 10 in the central area of the shaft system 2 advantageously enables elevator cars 3 to be changed between the shafts 5, 6 without an elevator car 3 having completed a complete circuit through the shaft system 2. As a result, the control device of the elevator system 1 can advantageously react in a further improved manner to temporary and / or locally higher transport needs of people.

The control device of the in Fig. 1 The elevator system 1 shown here is also set up to define at least one number of shaft positions 7 which corresponds to the number of elevator cars 3 and which can each be approached by the elevator cars 3. In this exemplary embodiment, the stops on floors 4 are defined as shaft positions. With regard to these shaft positions 7, that is to say in this exemplary embodiment with regard to the stops on the floors 4, the control device then synchronizes the movement of the elevator cars 3.

This means that the further upward and / or downward movement of the elevator cars 3 is synchronized with respect to the defined shaft positions 7. In particular, if more elevator cars 3 are moved in the elevator system 2 than the elevator system 2 has stops, there is provision for further shaft positions to be defined between the stops, with respect to which the movement of the elevator cars 3 is then synchronized in addition to the stops.

Since in such elevator systems 2, as in Fig. 1 shown, the number of elevator cars 3 can advantageously be adapted depending on requirements, is advantageously specified as a predetermined event when the number of movable elevator cars 3 of the elevator system 2 exceeds the number of stops of the elevator system. When this event occurs, the shaft positions with respect to which the synchronization of the movement of the elevator cars 3 is carried out are advantageously redefined. If elevator cabins 3 are discharged from elevator system 2 so that the number of stops of the elevator system is again equal to or greater than the number of movable elevator cabins 3, this advantageously represents a further predetermined event, which triggers a redefinition of the shaft positions 7.

Other such predetermined events that trigger a new definition of the shaft positions are, in particular, certain times of the day at which there is an increased need for local transport. Such times of the day in office buildings are especially the beginning of working hours, i.e. when many people want to be transported from the ground floor and / or from an underground car park to the higher floors, lunchtime and the end of working hours, i.e. when many people from the upper floors in want to move to the ground floor or the underground car park. In this case, elevator cars 3 should advantageously be provided at the shortest possible time intervals. Shaft positions are advantageously defined starting from an "boarding stop" at predetermined intervals so that a safety distance is maintained between the elevator cars 3 and short time intervals between the departure of an elevator car from the "boarding stop" and the entry of another elevator car into this "boarding stop " lie. In particular, the synchronization can take place in such a way that the departure of one elevator car from the "boarding stop" and the "moving up" of the others from the respective shaft position of these elevator cars to the respective next shaft position take place simultaneously.

In order to synchronize the movement of the elevator cars, the in Fig. 1 In the illustrated embodiment, the control device logically assigns one of the defined shaft positions 7 to one of the elevator cars 3. This is advantageously done in such a way that the respective current position of the elevator cars in the respective shaft 5, 6 is defined as the shaft position. If all elevator cars 3 stop at a stop on a floor 4, the stop at which the respective elevator car 3 is located is, for example, the shaft position 7 assigned to this elevator car 3. In the further course of the process, each elevator car 3 is then advantageously the shaft position at which it is still which is located in the elevator car 3 driving ahead of this elevator car 3, so that the next synchronization, considered for this elevator car, takes place with respect to this newly defined shaft position. Advantageously, a shaft position of an elevator car is thus logically assigned at any time, with the assignment being newly carried out in particular after a synchronization process, in particular in such a way that the shaft positions are now assigned a "moving up" other elevator car.

As an advantageous variant of the in Fig. 1 The elevator system 1 shown here provides that when the elevator system is operated in accordance with an embodiment of the method according to the invention for operating the elevator system 1, the relocating devices 10 are each defined as the shaft position 7 for an elevator car 3 being relocated by the relocating device 10. For at least one of the elevator cars, the synchronization then takes place with respect to this relocating device 10.

According to a further embodiment variant, it is provided that the elevator system 1 is operated in such a way that a sub-area of the shaft system 2, in which a subset of the elevator cars 3, i.e. not all of the elevator cars 3 of the elevator system 1, is located, is excluded from the implementation of the synchronization . The control device of the elevator system 1 is advantageously designed for a corresponding control of the elevator system 1. For example, in this variant embodiment, a relocating device 10 can be defined as such a sub-area of the shaft system that is excluded from performing the synchronization. In particular, however, a sub-area of the shaft system can also be excluded from performing the synchronization as a function of call requests. For example, there are many call requests in a lower part of the building, however few call requests in an upper part of the building, so that only a few elevator cars 3 in this upper part of the building are moved with a large distance that significantly exceeds the safety distance from elevator cars, this upper part of the building is advantageously excluded from the synchronization. For this upper part of the building, that is to say the sub-area of the shaft system 2 assigned to this upper part of the building, a synchronization that is independent of the rest of the shaft system 2 is then advantageously carried out.

With reference to Fig. 2 an exemplary embodiment of a method according to the invention for operating an elevator system with a relocating device 10 is described in more detail. Shafts 5, 6 that actually run vertically are shown here horizontally to improve the illustration of the movement of the elevator cars 3, the same elevator system being shown one below the other at progressive points in time. This means that the in Fig. 2 Shaft 5 shown to the left of relocating device 10, which is actually the shaft in which elevator cars 3 are moved upwards, which is symbolically shown by arrow 8. The in Fig. 2 Shaft 6 shown to the right of relocating device 10 is actually that shaft in which elevator cars 3 are moved downward, which is symbolically shown by arrow 9. Floors 4 at which stops of the elevator system for the elevator cars 3 are located are symbolically represented by vertical lines. To distinguish between the individual elevator cars, the reference symbol “3” is followed by a further number so that in Fig. 2 Elevator cars 30, 31, 32, 33 and 34 are shown.

The elevator cars 30, 31, 32, 33 and 34 are moved separately from one another, i.e. in particular not coupled to one another, between floors 4 of the elevator system in a circulating operation, in such a way that the elevator cars 3 are moved upwards in the first shaft 5 and in the second shaft 6 can be moved downwards. The stops on the floors 4 to which the elevator cars 30, 31, 32, 33 and 34 can approach are defined as shaft positions 7. With regard to these stops defined as shaft positions 7, the movement of the elevator cars 30, 31, 32, 33 and 34 is then synchronized.

The one related to Fig. 2 The exemplary embodiment explained here provides that, with regard to the defined shaft positions 7, that is to say with regard to the stops, the synchronization of the movement of the elevator cars 30, 31, 32, 33 and 34 in this way it is carried out that all elevator cabs, that is to say all elevator cabs included in the synchronization, leave the stops at the same time. In this respect, this synchronization can be referred to as start synchronization. In particular, it is provided that the elevator cars 30, 31, 32, 33 and 34 are each moved according to a travel curve, with an adaptation of the respective travel curves taking into account the positions of the elevator cars 30, 31, 32, 33 and 34 to synchronize the movement Elevator cabins 30, 31, 32, 33 and 34 in the respective shaft 5, 6 takes place. The relocating device 10 and the elevator cabins located in the relocating device 10 are excluded from the synchronization.

Advantageously, operating parameters relating to each of the elevator cars 30, 31, 32, 33 and 34 are recorded and each of the elevator cars 30, 31, 32, 33 and 34 integrated in the synchronization, at least taking into account the operating parameters recorded for the respective elevator car and taking into account the the operating parameters detected by the elevator car traveling ahead of this elevator car. The current position, speed, acceleration and the respective waiting time in the respective stop of each elevator car are recorded as operating parameters. The waiting times, that is to say holding times of each elevator car, during which the respective elevator car is not moved, is predicted for each of the elevator cars and recorded as one of the operating parameters. If a short waiting time is predicted for the next stop of an elevator car, compared to other elevator cars, the arrival of an elevator car can be delayed by adapting the input values of the travel curve of this elevator car. This can happen during the journey to the stop or before the start of a journey to the stop. The later arrival and the shorter stopping time compared to the other elevator car results in a synchronized start of the next trip without additional waiting times.

In Fig. 2 is now shown by way of example at "step 2" how the elevator car 31 and the elevator car 34 each stop at a floor 4 at a stop as a defined shaft position 7. Since leaving the stop is synchronized, the elevator car 31 and the elevator car 34 leave the respective stop at the same time, as shown under "step 3". The elevator cars 32, 33 located in the relocating device 10 are excluded from the synchronization. "Step 4" now shows how an elevator car 30 moves into a stop as a defined shaft position 7, this shaft position 7 being logically linked with this elevator car 30. The elevator car 31 moves into the relocating device 10, so that it is initially excluded from further synchronization, as is the elevator car 32 still in the relocating device 10. The elevator car 33, on the other hand, has left the relocating device 10 and is approaching a stop as a defined shaft position 7. This elevator car 33 is logically linked to this shaft position. The elevator car 34 becomes another, in Fig. 2 Move the stop, not shown. In this exemplary embodiment, the elevator cars 30, 33 and 34 do not have to enter the next stop at the same time. If a less long stopping time at the stop is predicted for an elevator car, for example the elevator car 30, than for another elevator car, for example the elevator car 33, then it is advantageously provided that in order to avoid holding times that are perceived as annoying by the people being transported, the The journey of the elevator car 30 is delayed, so that it enters the assigned stop later than the elevator car 33. In "step 5" it is shown how the elevator car 30 and the elevator car 33 are both in the respective stop, so that a simultaneous exit of these elevator cars 30, 33 from the stops can be realized.

Three advantageous configuration variants of the synchronization according to a method according to the invention are described below with reference to FIG Fig. 3, Fig. 4 and Fig. 5 explained in more detail. For the purpose of a better overview and easier understanding, FIGS. 3 and 4 only two consecutive elevator cars are taken into account.

In FIGS. 3 and 4 as an example, the upward movement of elevator cars, i.e. reaching a greater height (h) within a building over time (t).

The in Fig. 3 The illustrated embodiment, the shaft positions 71, 71 ', 72, 72', 73 and 73 'are defined shaft positions within the meaning of the invention. With regard to the defined shaft positions, as explained in more detail below, the synchronization of the movement of the elevator cars is carried out in such a way that all elevator cars leave the defined shaft positions at the same time. In this exemplary embodiment, the defined shaft positions 71, 71 ', 72, 72', 73 and 73 'are each stops. In principle, however, positions outside of stops can also be determined as defined shaft positions.

The in Fig. 3 The illustrated embodiment are initially both elevator cars in a stop 71 and 71 '. With regard to the defined shaft positions 71, 71 ', 72, 72', 73 and 73 ', the synchronization of the movement of the elevator cars is carried out in such a way that the elevator cars reach the defined shaft positions 71, 71', 72, 72 ', 73 and 73' at the same time. leave. This means that even if one of the elevator cars could already start moving because no people get on or off, this elevator car is held in the respective shaft position until all elevator cars that are involved in the synchronization process are ready to leave. This results in the in Fig. 3 shown holding times 121 and 121 'of different lengths for the elevator cars. When all elevator cars are ready to leave, the elevator cars start together, as in Fig. 3 shown as an example. In order to prevent excessively long holding times, it is provided as an advantageous embodiment of the method that the doors to the cabins are forced to close after a predetermined maximum time interval. The expiry of this time interval is advantageously signaled to the people, in particular by means of a countdown display and / or a signaling device in the manner of a traffic light.

Before the elevator car arrives at the next shaft position in which in Fig. 3 The exemplary embodiment shown before arriving at the shaft positions 72 or 72 ', particularly preferably before the elevator cars depart from the respective stop 71 or 71', the holding time for each elevator car at the respective shaft position 72, 72 'is predicted. For this purpose, stochastic methods are used in particular. The respective current load in the respective elevator car and / or a learned traffic flow and / or the number of people waiting at the respective stop are advantageously taken into account. The number of people waiting is determined in particular via the number of incoming destination calls and / or by means of camera systems.

The travel curves 111, 111 ', 112, 112' of the elevator cars are adapted as a function of the respectively predicted stopping times for the elevator cars, advantageously in such a way that unnecessarily long stopping times are avoided as far as possible. Because long stopping times are perceived as annoying by the passengers. Since the in Fig. 3 illustrated embodiment for the elevator car traveling ahead the predicted holding time 122 'is shorter than the predicted holding time 122 for the elevator car traveling behind, the respective travel curves 111' and 111 are adapted in such a way that the elevator car traveling ahead the shaft position 72 'reaches the shaft position 72 later than the elevator car traveling behind. The travel curve 111 is therefore steeper than the travel curve 111'.

With regard to the next stop at the shaft positions 73 or 73 ', the predicted holding time 123' for the elevator car traveling in front is longer than the predicted holding time 123 for the following elevator car. The travel curve 112 'of the preceding elevator car is therefore adapted in such a way that it reaches the shaft position 73' faster than the following elevator car reaches the shaft position 73. The travel curve 112 therefore runs flatter than the travel curve 112 '. Unlike the in Fig. 3 Shown embodiment shown, the travel curve does not have to run linear. In particular, it is provided that the travel curves can be adapted to changed operating parameters. Such an adaptation can take place, in particular, if further destination calls are detected while the elevator cars are moving and the expected holding time of one or more elevator cars thus changes. The fact that the elevator cars leave the defined shaft positions 71 and 71 'or 72 and 72' or 73 and 73 'at the same time advantageously prevents the elevator cars from "running into" and thus prevents a bunching effect. In addition, a safety distance between the elevator cars is advantageously maintained in an improved manner.

The in Fig. 4 In the illustrated embodiment, the movement of the elevator cabs is synchronized with respect to the defined shaft positions 71, 71 ', 72, 72', 73 and 73 'in such a way that the elevator cabs that are involved in the synchronization reach the defined shaft positions at the same time. As with the one related to Fig. 3 illustrated embodiment is also in connection with Fig. 4 illustrated embodiment provided that stops are each defined as the defined shaft positions 71, 71 ', 72, 72', 73 and 73 '. In this exemplary embodiment, the elevator cars are each logically linked to the defined shaft positions. In the representation in Fig. 4 Thus, for example, the elevator car traveling in front is first logically linked with the shaft position 71 ', then with the shaft position 72' and then with the shaft position 73 '. Correspondingly, the following elevator car is logically linked with the shaft position 71, then with the shaft position 72 and then with the shaft position 73. This means that in each case the defined shaft position to be reached next by an elevator car in the direction of travel of an elevator car is logically assigned to the respective elevator car.

The synchronization of the movement of the elevator cabs then takes place in each case with regard to the respective shaft positions logically linked to the elevator cabs.

Advantageously, expected stopping times 121, 121 ', 122, 122', 123 and 123 'of the elevator cars, as in connection with Fig. 3 explains, predicts. The elevator cars are each moved according to individual travel curves 111, 111 ', 112 and 112'. To synchronize the movement of the elevator cabs, the respective travel curves 111, 111 ', 112 and 112' of the elevator cabs are adapted taking current operating parameters into account, in particular taking into account the positions of the elevator cabs in the respective shaft.

As in Fig. 4 Illustrated by way of example, the shaft positions 71 and 71 'are reached simultaneously by the elevator cars. As soon as it is possible to leave the respective elevator car from the respective stop, in particular when no more people get in or out, the elevator cars leave the respective stops. This results in different holding times 121, 121 ', 122, 122', 123 and 123 'of the elevator cabins. So that the elevator cabs nevertheless reach the next stop as the next defined shaft position at the same time, the travel curves 111, 111 ', 112 and 112' of the elevator cabs are adapted accordingly. Since the elevator car traveling in front leaves the shaft position 71 ', for example, later than the elevator car traveling behind the shaft position 71, the elevator car traveling in front is moved at a higher speed than the following elevator car. The travel curve 111 'is therefore steeper than the travel curve 111. Accordingly, the travel curve 112 of the elevator car traveling behind is adapted in such a way that this elevator car is moved more slowly than the elevator car traveling ahead. The travel curve 112 ′ is therefore flatter than the travel curve 112.

The one related to Fig. 4 Operation of an elevator system explained above, the travel curves of the elevator cars are changed, in particular by adapting the input values of the travel curves, so that the elevator cars arrive at their next stop at the same time. Elevator cabins can then individually start the journey to the next stop after their respective stopping time at the respective defined shaft position. The common arrival time at the next stop is advantageously used to determine suitable input parameters for the travel curves for the elevator car to travel on. The probable holding times and / or the probable remaining holding times of the individual elevator cars are advantageously taken into account. An advantage This arrival synchronization is that there is no need to passively wait, since only the travel curves of the elevator cars are adapted.

The synchronization advantageously always takes into account that predetermined safety distances between the elevator cars are maintained. For this purpose, operating parameters are advantageously recorded with respect to each of the elevator cars and each of the elevator cars is moved at least taking into account the operating parameters recorded for this elevator car and taking into account the operating parameters recorded for the elevator car ahead of this elevator car.

In Fig. 5 Examples of elevator cars 31, 32, 33, 34, 35, 36 and 37 are shown at different positions (h) in the shaft system at times (t). The synchronization of the movement of the elevator cars 31, 32, 33, 34, 35, 36 and 37 takes place here advantageously in such a way that a time interval in Fig. 5 "cycle time" called, is observed between successive elevator cars. The synchronization of the elevator cars 31, 32, 33, 34, 35, 36 and 37 takes place in this exemplary embodiment with respect to the defined shaft positions 7.

The in Fig. 5 The illustrated embodiment, the synchronization of the movement of the elevator cars 31, 32, 33, 34, 35, 36 and 37 with respect to the defined shaft positions 7 is carried out in such a way that for an operating period of the elevator system, for example the morning operation of the elevator system, the elevator cars 31, 32, 33 , 34, 35, 36 and 37 are each at the respective shaft position 7 at a predetermined time, in particular reaching or leaving the respective defined shaft positions 7 at a predetermined time. This results, as it were, in a timetable for each of the elevator cars 31, 32, 33, 34, 35, 36 and 37. This timetable is advantageously adapted as required within the scope of the synchronization. Such an adaptation of the timetable as part of the synchronization is followed by an adaptation of the travel curves of the elevator cars 31, 32, 33, 34, 35, 36 and 37. This means that the timetable is advantageously only adapted if an adaptation of the driving curves alone is not sufficient to carry out the synchronization.

In particular, the representation in Fig. 5 can thus also be viewed as a schedule for an individual elevator car, the reference numerals 31, 32, 33, 34, 35, 36 and 37 in this case defining an individual elevator car at different times Positions h in the shaft system. For example, it can be provided that the reference numeral 31 designates the elevator car at the time 09:20:00, the reference numeral 32 designates the elevator car at the time 09:20:20, and the reference numeral 33 the elevator car at the time 09:20:40 denotes, the reference number 34 denotes the elevator car at the time 09:21:00, the reference number 35 denotes the elevator car at the time 09:21:20, the reference number 36 denotes the elevator car at the time 09:21:40 and the reference number 37 denotes the elevator car at the time of 09:22:00. The movement of the elevator cars is synchronized with respect to the defined shaft positions 7, where the further movement of the elevator car is delayed by stopping the elevator cars.

The exemplary embodiments shown in the figures and explained in connection with them serve to explain the invention and are not restrictive for it.

List of reference symbols

1

Elevator system

2

Shaft system

3

Elevator cabin

31

Elevator cabin

32

Elevator cabin

33

Elevator cabin

34

Elevator cabin

34

Elevator cabin

36

Elevator cabin

37

Elevator cabin

4th

floor

5

first shaft

6th

second shaft

7th

Shaft position

71

Shaft position

71 '

Shaft position

72

Shaft position

72 '

Shaft position

73

Shaft position

73 '

Shaft position

8th

Arrow for the symbolic representation of the upward travel

9

Arrow for the symbolic representation of the descent

10

Transfer device

11

Driving curve

111

Travel curve of an elevator car

111 '

Travel curve of an elevator car

112

Travel curve of an elevator car

112 '

Travel curve of an elevator car

121

Hold time of an elevator car

121 '

Hold time of an elevator car

122

Hold time of an elevator car

122 '

Hold time of an elevator car

123

Hold time of an elevator car

123 '

Hold time of an elevator car

H

Position in the shaft system

t

time

Claims (15)

1. Method for operating an lift system (1) having a shaft system (2) and a multiplicity of lift cars (3) which are moved separately from one another between floors (4) in a circulation operation in such a way that the lift cars (3) are moved upward in a first shaft (5) and are moved downward in a second shaft (6), wherein synchronization of the movement of the lift cars (3) is carried out with respect to defined shaft positions (7) which can be respectively adopted by the lift cars (3), wherein the number of defined shaft positions (7) corresponds at least to the number of lift cars (3), characterized in that in each case current positions (h) of the lift cars (3) in the respective shaft are defined as the shaft positions (7) at defined time intervals.
2. Method according to Claim 1, characterized in that the synchronization of the movement of the lift cars (3) is carried out in such a way that at the defined shaft positions (7) the lift cars (3) are each operated in the same operating state.
3. Method according to one of the preceding claims, characterized in that the lift cars (3) are each moved according to a travel curve (11), wherein, in order to synchronize the movement of the lift cars (3), the respective travel curves (11) are adapted taking into account the positions (h) of the lift cars (3) in the respective shaft.
4. Method according to one of the preceding claims, characterized in that in each case one of the defined shaft positions (7) is logically assigned to one of the lift cars (3) in each case, wherein in each case the shaft position (7) which is defined as the next to be reached in the direction of travel (8, 9) of an lift car (3) is logically assigned to the respective lift car (3).
5. Method according to one of the preceding claims, characterized in that the synchronization of the movement of the lift cars (3) is carried out with respect to the defined shaft positions (7) in such a way that the lift cars (3) reach the defined shaft positions (7) simultaneously and/or leave the defined shaft positions (7) simultaneously.
6. Method according to one of the preceding claims, characterized in that the synchronization of the movement of the lift cars (3) is carried out with respect to the defined shaft positions (7) in such a way that in each case a duration is predefined, wherein in the respective shaft the lift cars do not reach the shaft position (7) of the lift car which is respectively traveling ahead until after the expiry of this duration.
7. Method according to one of the preceding claims, characterized in that the synchronization of the movement of the lift cars (3) is carried out with respect to the defined shaft positions (7) in such a way that, for an operating time period of the lift system (1) the lift cars (3) each reach the respective defined shaft positions (7) at a predefined time and/or the lift cars (3) each leave the respective defined shaft positions at a predefined time.
8. Method according to one of the preceding claims, characterized in that the synchronization of the movement of the lifts cars (3) is carried out with respect to the defined shaft positions (7) in such a way that in each case a duration is predefined for an operating time period of the lift system (1), wherein in the respective shaft the lift cars do not reach the shaft position (7) of the lift car which is respectively traveling ahead until after the expiry of this duration.
9. Method according to one of the preceding claims, characterized in that operating parameters are acquired with respect to each of the lift cars (3), and each of the lift cars (3) is moved at least taking into account the operating parameters acquired for this lift car (3) and taking into account the operating parameters acquired for the lift car (3) which is traveling ahead of this lift car (3).
10. Method according to Claim 9, characterized in that stopping times during which the respective lift car (3) is not moved are predicted for each of the lift cars (3) and acquired as one of the operating parameters.
11. Method according to one of the preceding claims, characterized in that the lift system (1) has at least one transfer device (10) for transferring lift cars (3) between shafts (5, 6) of the lift system (1), wherein the at least one transfer device (10) is defined as a shaft position (7) for an lift car (3) which is transferred by said transfer device (10).
12. Method according to one of the preceding claims, characterized in that a sub-area of the shaft system (2) in which a subset of the lift cars (3) of the lift system (1) is located is excluded from the execution of the synchronization.
13. Method according to Claim 12, characterized in that, within the sub-area of the shaft system (2), synchronization which is independent of the rest of the shaft system (2) is carried out, preferably in accordance with the features of the preceding claims.
14. Lift system (1) having a shaft system (2), a multiplicity of lift cars (3) which can move in the shaft system (2), and a control device for operating the lift system (1), in particular for controlling the movement of the lift cars (3) in the shaft system (2), characterized in that the control device is configured to operate the lift system (1) according to a method according to one of Claims 1 to 13.
15. Lift system (1) according to Claim 14, characterized in that the lift system (1) is a shuttle system by means of which users are transported to further passenger transportation devices.

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