Toshiba Elevator and Building Systems Corporation

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Elevator GROUP CONTROL SYSTEMS

GROUP CONTROL SYSTEMS

The elevator analyzes the “now” of the building !
We will predict “future traffic conditions within the building” and provide the optimum elevator.

Real-Time Scheduling System

We will always analyze the very latest elevator operating conditions to predict the future elevator service situation, select the most suitable elevator and deliver it to the point of use.
Toshiba Elevator Group Control System: The Real-Time Scheduling System (RTS) not only shortens the waiting time of the elevator but also allows us to provide various environmentally friendly driving functions such as "Power saving function" and "Power saving allocation function".

◯:STANDARD, △:OPTIONAL, ✕:Inapplicable specifications

Descriptions Number of elevator application Number of the maximum application floors (Note1) Model No.
GA-2000 GA-200 GA-20
"Real time scheduling system (RTS)" can be applied to 12 elevators maximum with the latest features such as "Power saving function" and "Power saving allocation function".
This is a group control system suitable for large and medium sized buildings.
3 to 12 unitsl 128 stops    
It is a group control system applicable for medium and small sized buildings capable of up to 6 elevators, taking over the design concept of the top model of the group control systems.
We respond with various specifications such as priority service function and peak correspondence functions for specific floors etc.
3 to 6 units 64 stops    
This is a group control system for medium and small sized buildings that meet the specifications of basic functions such as "Fuzzy control " and high-sensitivity allocation to shorten elevator latency. 3 and 4 units 40 stops    

※Note 1: An express zone is not included. The actual number of applications is based on each elevator models .

Function Explanation Model No.
GA-2000 GA-200 GA-20
Real-Time Scheduling System(RTS) A new hall calls assignment procedure that can assign a car for a hall call efficiently by estimating the arrival of time to each the floor considering the future occurrence of passenger.
Self-learning system Analyzes and stores traffic demand by time period, and automatically tunes the control parameters used for fuzzy control and similar.
High-sensitivity car assignment
(Fuzzy control)
A hall calls assignment procedure using the fuzzy control method.
Expert system Specialized experience and expertise are coded into rules , and the optimum rules selected to offer service that best meets humans' psychological needs.

Leading edge and high-spec “Elevator Group control systems” is monitor the current building environment and predict the future.

To optimize elevator control, analyzing the movements of elevators in a building real-time and controlling them while predicting what may happen in the immediate future is crucial. Toshiba has developed the Real-Time Scheduling System (RTS) to control elevators properly and included it in elevator group control systems.

Image of control by the Real-Time Scheduling System (RTS)

The Real-Time Scheduling System (RTS) has successfully reduced maximum and average waiting times by 39 and 6%, respectively, compared to figures for conventional systems.

Measurement conditions :
The above performance comparisons were made between applied the Real-Time Scheduling System (RTS) and a conventional system based on simulation data using our simulator under the following conditions: Four cars capable of accommodating up to 24 persons, travelling at 150 m/min and stopping at 16 floors and 900 persons expected to ride these elevators per hour.

Real-Time Scheduling System (RTS)

A leading edge elevator group control system that analyzes the ever changing operating state of elevators and predicts the floors to which they will be called, to determine the operating schedule. It evaluates the operation service in real time based on the determined operating schedule to assign an elevator to each floor.

The “High-sensitivity allocation function” to which fuzzy control is applied

The “High-sensitivity allocation function” involves the application of fuzzy control, which means whenever a call button in the elevator hall is pressed, the system immediately considers which elevator is best placed to move the user comfortably and swiftly.

The “Expert system” with specialized experience and expertise coded into

Optimal elevator control requires control in accordance with the elevator operation rate and congestion level. Elevator experts preliminarily code controlling methods suitable for various situations into the rules.
The Expert system provides optimum control in line with the current operating state.

“Power Saving Allocation Function”, a new power saving function of elevator group control system, enables low power operation.

The Real-Time Scheduling System (RTS) analyzes the movement of elevators in a building, while the “Power Saving Allocation Function” selects an optimum schedule with reduced power consumption taking waiting time into consideration, regardless of the demand for traffic.

The above power saving effect is based on averages obtained by simulating the performance of 4 elevators capable of accommodating up to 24 persons, travelling at 150m/min and stopping at 16 floors for less congested, normal and congested periods respectively, under conditions of the Power Saving Allocation Function, Power Saving Operation, and normal operation. The power saving effect is relative to power consumption of 100% during normal operation. (Image)

Power Saving Allocation Function (Optional)

The Power Saving Allocation Function selects an operating schedule involving a reduced number of elevators based on the operating state predicted by the Real-Time Scheduling System (RTS) for ongoing Power Saving Operation. For the normal period, this can reduce power consumption by approximately 15 and 8% compared to normal and Power Saving Operation modes respectively. For less congested periods, savings are approximately 27 and 15% compared to normal and Power Saving Operation modes.
(Comparison using our simulator)

Power Saving Operation (Optional)

Reduces the number of operating elevators during less congested periods to reduce power consumption.

• The Power Saving Allocation Function and the Power Saving Operation may increase waiting time compared to normal operation.

This section lists convenient functions for each building type.

Office building

Up-peak operation
During the morning rush, returns cars to the main departure floor and automatically spaces departures.

Down-peak operation
Automatically deploys standby cars to upper floors to respond more efficiently to demand for descending elevators.

Up-peak split-zone operation (Optional)
Splits the group into cars serving upper and lower floors exclusively, limiting the destinations into zones to handle the morning peak volume more efficiently.

Lunchtime split-zone operation (Optional)
Splits the group into cars serving the upper and lower floors exclusively, limiting the destinations in to zones to handle the lunchtime peak volume more efficiently.

• The up-peak split-zone operation and the lunchtime split-zone operation are optional and applicable to the group control of 6 or more elevators.

Accommodation, such as hotels

Enhances comfortable operation
The least crowded cars are assigned.

Check-in services
Reserves a standby car with an open door at the front desk floor during check-in hours.

Check-out service
Automatically deploys more standby cars to upper floor s to respond more efficiently to demand for descending elevators.

Open door waiting on lobby floor (Optional)
Reserves a standby car with an open door at the lobby floor.

Banquet hall floor service (Optional)
Concentrated service for a banquet hall floor to meet temporary intensive demand.

Collective housing, such as condominium buildings

Going out service
Sends more cars for standby to the upper floors to respond more efficiently to demand for descending elevators during going-out hours in the morning.

Coming back service
Sends a car to the entrance floor with an open door during homecoming hours in the evening.

Medical facilities, such as hospitals

Morning-peak operation
In hospitals, many cars are often congested with incoming staff during morning hours. Demand for ascending elevators is effectively responded to, like those in office buildings.

Evening-peak operation
Meets the demand for traffic generated by interviews conducted in the evening.

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