JPH0712896B2 - Elevator control device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an elevator control device, and more particularly to an elevator control device suitable for control using a microcomputer.

[Conventional technology]

The elevator control device controls the traveling of the elevator, and in recent years, an elevator control device that processes complicated signals with high precision by digitally processing various signals using a microcomputer is disclosed in, for example, Japanese Patent Publication No.
Various proposals have been made in JP-A-56-78780.

FIG. 3 is an overall configuration diagram showing an example of an elevator control device using a microcomputer. In the figure, 1
Is a sheave of a hoisting machine installed above the hoistway, and is driven by the three-phase induction motor 2. 3 is a rope wound around the sheave 1,
A basket 4 and a counterweight 5 are suspended at both ends thereof. Reference numeral 6 denotes a plate, which is provided on each floor 7. A switch 8 is provided immediately before the terminal floor, and is operated by a cam (not shown) provided on the side of the car 4. A pulse generator 9 is driven by the three-phase induction motor 2 to generate a pulse corresponding to the rotation amount thereof. 10 is a counter for sequentially counting the pulse signals generated from the pulse generator,
The count value is cleared by an external signal. 11 is a microcomputer, as is generally known, a central processing unit (hereinafter referred to as CPU) 12, a read-only memory (hereinafter referred to as ROM) 13 and a random access memory connected to the CPU 12 via a bus line. (Hereinafter referred to as RAM) 14, input port 15 for receiving external signals, output port 16 for outputting control signals
It is composed of and. 17 is an inverter device for inputting a three-phase AC power supply RST, which is a microcomputer
Speed control is performed by supplying an AC output, the voltage and frequency of which are varied according to the speed command signal output from the output port 16 of 11, to the three-phase induction motor 2 as an AC power source.

In the elevator controller configured as described above,
When the output of the inverter device 17 is supplied to the three-phase induction motor 2 by closing an electromagnetic switch (not shown) in response to the traveling command of the elevator, the three-phase induction motor is activated to correspond to the designated traveling direction. Rotate. When the sheave 1 of the hoisting machine is rotationally driven by the rotation of the three-phase induction motor 2, the rope 3 on the side of the car 4 is wound up and the car 4 travels upward.

On the other hand, since the pulse generator 9 is connected to the three-phase induction motor 2, a pulse corresponding to the rotation amount is generated from the pulse generator 9 and is supplied to the counter 10 for sequential counting. .

Then, the count result of the counter 10 is read by the microcomputer 11 at each calculation cycle and the count value is cleared. The microcomputer 11 adds / subtracts the read count value to / from the car position one calculation cycle before, that is, adds it when the car 4 is moving upward, and stores the subtracted result in the RAM 14 as the current position of the car 4. By repeating such operations, the microcomputer 11 detects the current position of the car 4.

Further, the microcomputer 11 detects a signal output from a sensor (not shown) provided in the car 4 every time when the microcomputer 11 passes through a portion facing the plate 6 provided on each floor 7, and the car 4 at this time point is detected. From the bottom floor (hereinafter referred to as the BOT floor) to the top floor (hereinafter referred to as the TOP floor) at the current position, for example, in the case of a building with N stops, each floor BOT
~ Level levels on the TOP floor are sequentially written in the RAM 14 as FLH (0) ~ FLH (N-1). Therefore, the current position of the car 4 and the floor height value for each floor are written in the RAM 14, and the CPU 12 operates the inverter device 17 via the output port 16 according to the result calculated based on the value of the RAM 14. By controlling, the rotation of the three-phase induction motor 2 is controlled to give instructions to the car 4, such as acceleration, deceleration, and landing. For example, at the time of deceleration, the car 4 is smoothly decelerated by giving the inverter device 17 an optimal speed command signal corresponding to the remaining distance to the floor level of the floor to be landed, depending on the current position of the car 4 and the floor height value. This will allow you to land.

Next, the flow of the main program stored in the ROM 13 will be described with reference to FIG. First, the moving pulse number DP measured in step 41
The SI is calculated in step 42 to calculate the current position SYNC of the car 4. The details of the processing in step 42 are obtained by adding the moving pulse number DPSI to the current position SYNC one calculation cycle before, as shown as step S51 in FIG.

Next, in step 43 shown in FIG. 4, the difference between the current position SYNC obtained in step 42 and the floor position of the floor to be landed is obtained as the remaining distance RDST. Then, in step 46, a speed command signal corresponding to this remaining distance RDST is calculated, and the inverter device 17 is controlled according to this calculation result, whereby the car 4 is decelerated and landed on the target floor.

On the other hand, if the selector is misaligned when traveling on the terminal floor (hereinafter,
If the current position of the car or the remaining distance is deviated, it is called selector deviance).
Backup calculation is performed. For example, as shown in FIG. 6, the current position SYNC of the car stored in the RAM 14 is 6
Although it is the position indicated by 2, assuming that the actual position of the car 4 is 61, the remaining distance RDST stored in the RAM 14 is larger than the actual remaining distance, so the car 4 arrives at the TOP floor. You will pass this floor without flooring. To prevent such an accident from occurring, an end point switch 8 is provided in front of the terminal floor as shown in FIG. When the car 4 passes through the end point switch 8, the output signal generated from the end point switch 8 is sent to the CP via the input port 15.
Supplied to U12. Then, the determination at step 44 in FIG. 4 becomes YES, so that the procedure goes to step 45 to correct the selector. That is, when the car 4 passes through the end point switch 8, the distance X from the end point switch 8 stored in the ROM 13 to the top floor TOP (6th
(Fig.) Is set as the remaining distance RDST and corrected by processing as shown in step 71 in Fig. 7, and the car 4 is accurately stopped with respect to the top floor TOP.

[Problems to be solved by the invention]

However, in the backup calculation of the selector having the above configuration, there is a problem that the riding comfort is deteriorated due to an operation error and an attachment error of the end point switch, a deviation of the fetch timing with respect to the end point switch signal of the CPU, and the like.

The present invention has been made to solve the above conventional problems, and improves the ride comfort by eliminating the error of the end point switch and the error due to the dead time generated when the CPU inputs the end point switch signal. The purpose is to do.

[Means for solving problems]

The elevator control device according to the present invention always performs a backup calculation in addition to the normal calculation of the current car position, thereby setting the remaining distance to the terminal floor.

[Action]

In the elevator controller thus configured,
The distance to the terminal floor is set by performing the operation for backing up the terminal floor so that the passenger can land on the terminal floor comfortably.

〔Example〕

1 and 2 are flowcharts showing an embodiment of the elevator control apparatus according to the present invention.
The same reference numerals as those in FIG. 7 and FIG. 7 indicate the same parts. This Fig. 1,
The apparatus to which FIG. 2 is applied has the same configuration as that of FIG. FIG. 1 shows a portion for performing a backup calculation for correcting the shift of the selector when the terminal floor is traveling and for landing the car 4 on the terminal floor. That is, as shown in FIG. 6, if the current position of the car 4 stored in the RAM 14 shown in FIG. 3 is 62, the actual position is 61, so the selector needs to be modified. The modification of the selector will be described below with reference to the flowchart shown in FIG.

FIG. 1 shows the procedure 42 in the flow chart shown in FIG.
FIG. 7 shows an improved processing method of the car current position calculation processing shown in FIG. First, in step 51, the current position of the car 4 is obtained by adding the number of movement pulses obtained in step 41 to the current position SYNC one operation cycle before. Next, in step 52, it is judged whether or not the car 4 has passed the reference level of each floor.
If the determination in 52 is no, the procedure returns to step 54 and the operation of returning after repeating the calculation of the moving distance d of the car 4 from the reference level of each floor is repeated. When the determination in step 52 is YES, the procedure moves to step 53 and d is set to zero.

That is, this moving distance d is an absolute position from the reference level position of each floor, and d = d 'even when the selector is displaced as shown in FIG. Therefore, basket 4
If it is determined in step 44 shown in FIG. 4 that the signal has passed through the end point switch 8, the process proceeds to step 45 to correct the selector. That is, the procedure 55 shown in FIG.
, The TOP-1 stored in the RAM 14 shown in FIG.
The sum of the floor height value FLH (N-2) and d of the floor is set as the current position SYNC ← FLH (N-2) + d of the car 4. However, d = d '
Therefore, FLH (N-2) + d '= FLH (N-2) + d.

Next, in step 56, the car 4 modified in step 55
Current position SYNC and floor price of TOP floor stored in RAM14
Set the remaining distance RDST with FLH (N-1). (RDST ← F
LH (N-1) -SYNC).

Even if the selectors are misaligned in this way, the optimum speed command is always issued in step 46 because the selector correction is performed in steps 55 and 56 when the car 4 passes the end point switch 8. It is possible to accurately decelerate and land the car 4 on the TOP floor.

〔The invention's effect〕

As described above, in the elevator control device according to the present invention, the remaining distance to the terminal floor is set by always performing the backup calculation separately from the normal car current position calculation. The error due to switch operation, mounting error, and dead time that occurs when the CPU inputs the end point switch signal are eliminated, and the error in the remaining distance value that is corrected accordingly is reduced, and It has an excellent effect of improving the riding comfort.

[Brief description of drawings]

1 and 2 are diagrams showing a position calculation flow chart and a selector correction flow chart for explaining the operation of the elevator control apparatus according to the present invention, FIG. 3 is an overall configuration diagram of the elevator, and FIG. 4 is FIG. Fig. 5 is a control flowchart of the elevator shown in Fig. 5, Fig. 5 is a flowchart showing details of the current car position calculation process shown in Fig. 4 in the conventional elevator control device, and Fig. 6 is a diagram showing selector deviation when the terminal floor is traveling. FIG. 7 is a flowchart showing details of the selector correction processing shown in FIG. 4 in the conventional elevator control device. 1 ... sheave, 2 ... three-phase induction motor, 3 ... rope,
4 ... basket, 5 ... counterweight, 6 ... plate,
7 ... Floor, 8 ... End switch, 9 ... Pulse generator, 10 ... Counter, 11 ... Microcomputer, 12 ...
… CPU, 13 …… ROM, 14 …… RAM, 15 …… Input port, 16
...... Output port, 17 …… Inverter device. The same reference numerals in the drawings indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A current position of the car is calculated from a pulse corresponding to a moving distance of the car, and a floor height value indicating a floor position of the floor to be stopped of the car and a current position of the car to the floor to be stopped. By calculating the remaining distance and calculating the speed command value that commands the traveling speed of the car, and operating the end point switch installed in front of the terminal floor of the car, the distance from this end point switch to the terminal floor is calculated. In an elevator that calculates the speed command value as the remaining distance, when the car passes each floor position, a moving distance calculating means that calculates the moving distance of the car from that position, and the car operates the end point switch. In such a case, the terminal floor current position calculating means for setting the value obtained by adding the value calculated by the moving distance calculating means to the floor height value of the floor before the terminal floor as the current position of the car is provided. Elevator control apparatus according to.