JPS6229355B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an elevator control device.

In recent years, a group control elevator system using computers has been developed and is now partially in operation. This system is broadly divided into two devices: a group management device that stores hall calls and assigns them to each car, and an individual car control device that receives instructions from the group management device and controls the operation of the cars.

Although the group management device and each unit control device are usually constructed from separate electronic computers, it is natural that signals must be exchanged between them. In this case, in order to synchronize the calculation cycles of the programs of both devices, it is often done to receive a signal from the other device and then output the signal to the other device.

In the case of a group management device and an individual controller, the group management device usually outputs a signal first, and the individual controllers often synchronize with it. This is because while there is only one group control device, there are as many control devices for each car as there are cars, so it is easier to synchronize if the group control device is on the active side.

However, if the group control device malfunctions and signal transmission is no longer performed, each car control device continues to wait for the signal and actual calculations do not proceed, resulting in the problem that the cars cannot be operated. In this case, there is a so-called system failure in which all the cars cannot be operated, which causes a serious inconvenience to users, especially in modern times where there are many buildings where elevators are the center of up and down transportation for people.

This invention solves the above-mentioned drawbacks, and aims to provide an elevator control device that prevents the system from going down even if the group management device fails.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

In FIG. 1, 1 is a group control device, 2 is an individual car control device, 3 is a landing device such as a landing button and a car position indicator, 4 is a hoistway switch that detects the car position, etc.
5 is an elevator car, 11 is a central processing unit that performs program calculation processing within the group control device 1, 12 is a memory for storing programs and data, and 13 is also a selection of input/output with external equipment and level conversion. 14 is also a signal transmission device with the control device 2 for each unit, 15 is a timer that also provides cycle timing of program calculation,
21 is a central processing unit in each control device 2, 22 is a memory, 23 is an input/output converter, 24
Similarly, 25 is a signal transmission device with the group management device 1, and a timer.

Although only one car controller 2, hoistway switch 4, and car 5 are shown in the figure, a plurality of car controllers 2, hoistway switches 4, and cars 5 are usually installed.

101 to 111, 201 in Figures 2 and 3
216 indicate the steps of the operation of the group management device 1 and each unit control device 2, respectively.

First, the elevator system that is the premise of this embodiment will be explained.

In the group management device 1, the central processing unit 11 is activated by a timer interrupt given by the timer 15, and is controlled by a program stored in the memory 12 to control input/output converters from the hall device 3 and each car control device 2. 13 and the signal transmission device 14, performs various calculations using the memory 12, and transmits the results to the hall device 3 and each car control device 2. The main specific function is that when the hall button on the hall device 3 is pressed, it is determined whether or not to register a hall call depending on the car position, direction, running/stopping, etc. of the car in each car control device 2. When determining and registering, a command to turn on the registration light built into the hall button is given to the hall device 3, and a command (assignment) is given to each car control device 2 as to whether or not to service it. be.

In each car control device 2, in almost the same way as the group control device 1, the central processing unit 21 controls input/output converters 23 from the hoistway switch 4 and the car 5 to the group control device 1 according to a program stored in the memory 22. Information is taken in from the car through the signal transmission device 24, various calculations are performed using the memory 22, and the results are transmitted to the car 5 and the group management device 1. The main specific function is to start and start the car 5 based on the car position information from the hoistway switch 4 and the status of the car 5 in response to the car call registered within the car and the assignment transmitted from the group control device 1. It determines the stop timing, provides information for controlling the operation of the car 5, and opens and closes the door of the car 5.

Next, the operations of the group management device 1 and each unit control device 2 expressed by the programs stored in the memory 12 and the memory 22 will be explained.

In the group control device 1, when the power is turned on in step 101, initial settings 1 are performed to provide initial values of various variables.
After performing step 02, a timer setting step 103 is performed to set a time limit to cause a timer interrupt, and the interrupt is waited for in step 104. For example, 30
Assuming that a timer interrupt is set to occur after milliseconds, timer interrupt 1 is sent from timer 15 to central processing unit 11 30 milliseconds after timer setting 103.
05 is multiplied. Then, after setting the timer 106 to, for example, 30 milliseconds again, each control device 2
A synchronization signal output 107 is performed for. This synchronization signal is transmitted to the central processing unit 21 of each control device 2 through the signal transmission devices 14 and 24. next,
After executing the group management 108 that performs "assignment" etc., which is the main function of the group management device 1, a transmission 1 performs sending and receiving signals to and from each unit control device 2 through the signal transmission device 14.
09 and input/output 110 for exchanging signals with the hall device 3 through the input/output converter 13. In this way, when the series of programs is executed once, the process returns from step 111 to interrupt wait 104, and the timer interrupt 105 set in step 106 is executed.
Wait until it comes in.

In each control device 2, steps 201 to 204 from power-on to waiting for an interrupt are the same as steps 101 to 104 in the group management device 1. When a timer interrupt 205 occurs, timer setting 206 is first performed.
This time limit shall be 30 milliseconds. Next, a variable (abbreviated as a flag) that indicates whether the previous operation has finished
The value of is checked in step 207. If the value of the flag is "0", the previous operation has been completed,
If it is "1", it indicates that the previous operation has not been completed yet. Although not shown in the figure, assuming that the flag is initially set to "0" in the initial setting 202, the process proceeds to step 208 and the flag is set to "1". Next, it is checked whether a synchronization signal has been received from the group control device 1, and step 209 is executed until the synchronization signal is received.

If the synchronization signal is received within 30 milliseconds, step 21
Go to 0 and reset the timer. In this case, cancel the previous timer setting and make the time limit a little shorter than 30 milliseconds. Next, in step 211, the group management device 1
It is checked whether a transmission signal has been received from the source, and if it has been received, transmission 212 is performed. Thereafter, each car controller 213 controls the operation of the car 5, and an input/output 214 performs signal exchange with the hoistway switch 4 and the car 5 through the input/output converter 23. After setting the flag to "0" in step 215, step 2
16 and then waits for an interrupt 204.

However, if the synchronization signal is not received within 30 milliseconds in step 209 due to a malfunction in the group control device 1, an interrupt is generated by the timer 25 set in step 206, and steps 210 to 2 are interrupted.
Set the timer again 206 without performing the calculation in step 15.
becomes. Next is step 207, but since step 215 has not been performed, the flag remains at "1", and each unit control 213 and input/output 214 are performed without going through steps 208 to 212. . Since the flag is set to "0" in step 215, synchronization is performed again in step 209 in the next calculation, and when the group management device 1 is restored, the group management device 1 and each unit control device 2 perform synchronous calculation again. .

The same is true when no transmission signal is received in step 211. That is, step 21
Step 21 without performing operations 2 to 215.
An interrupt is generated by the timer 25 set to 0. The subsequent processing is as described above.

In this way, a failure in the group control device 1, especially a failure that affects the transmission part, can be determined by whether the "flag" is "1" or "0", and even in the case of a failure, operation can still be carried out. .

However, since no signal is input from the group control device 1, no "assignment" is performed and no hall calls come in, so the car 5 is stopped at each floor. Of course, it is also possible to configure the system so that even if the group control device 1 fails, only the hall call can be input, and in that case, the operation will be even better, but this is not directly related to this invention and will therefore be omitted.

In addition, in the embodiment, the group management 108 and each machine control 21
Although the input/output operations 110 and 214 are performed after 3, the order does not particularly matter. The order of other operation steps is not limited to the embodiments, as long as the spirit of the invention is satisfied.

In addition, if the group control device 1 fails, in the embodiment, synchronization is performed once every two times, so as a result, each unit control 211 and input/output 212 can only be performed once every approximately 60 milliseconds. It turns out. If this is inconvenient, you can add a circuit that will not synchronize once a failure occurs until a certain condition is met (for example, when car 5 stops or 1 second has passed) .

Further, in this embodiment, everything including timer setting, failure detection, input/output, etc. is executed by a program, but it is clear that the same effect can be obtained even if some parts are implemented in hardware.

Furthermore, it is clear that the failure detection function is not limited to each control device 2, but can be widely applied to control devices that perform periodic calculations.

As explained above, in this invention, at the beginning of the calculation cycle in each car control device, if the previous calculation has not been completed, a failure signal is issued to control the operation of the car. It is possible to prevent the system from going down due to a failure of a part of the system, and the service will not be extremely deteriorated, and the inconvenience for users can be alleviated.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a group control device showing one embodiment of an elevator control device according to the present invention, and FIG.
This figure is a flowchart of the operation of the group management device shown in FIG. 1, and FIG. 3 is a flowchart of the operation of the individual control device. 1...Group management device, 2...Each unit control device, 3...
... Hall equipment, 4 ... Hoistway switch, 5 ... Elevator car, 11 ... Central processing unit, 12 ...
Memory, 13... Input/output converter, 14... Signal transmission device, 15... Timer, 21... Central processing unit, 22... Memory, 23... Input/output converter, 2
4...Signal transmission device, 25...Timer.

Claims (1)

[Claims] 1. In a system in which the operation of a car is controlled by periodically performing control calculations at fixed time intervals using an electronic computer, at least at the specified time period at the beginning of the control calculation or in the middle of the control calculation. a setting means that operates to set the status indicator before the end of the control operation; a reset unit that operates at the end of the control calculation to reset the status indicator; and a reset unit that operates prior to the setting unit to set the status indicator to the set state. 1. A control device for an elevator, comprising: first means for issuing a failure signal when detecting that the failure signal is present; and second means for controlling operation of the car based on the failure signal.