JPS58202275A - Controller for elevator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an elevator control device, and more particularly to an elevator control device suitable for safely stopping an elevator at the endmost floor.

First, a conventional elevator most floor deceleration system will be described with reference to FIGS. 1 to 3.

FIG. 1 is a block diagram of an elevator speed control device. When the elevator call is registered and the operating direction is determined to be up or down, the electromagnetic contactor D1sD or U,
U, is turned on, and three-phase alternating current is applied from the three-phase power supplies R9S and T to the high-speed winding Mu of the induction motor M via the thyristor unit S1°S1. For example, if descending operation is selected, the electromagnetic contactor D1. D is input, and almost synchronously with this, the speed pattern generating means SP in the microcomputer MC issues a speed command for acceleration.

This speed command signal is matched with the speed signal from the speed generator PG coupled to the induction motor M, and the difference signal drives the gate of the thyristor unit (St) via the amplifier A1, depending on the load and speed. The current is supplied to the high speed winding MH of the induction motor M. As a result, the elevator car C is operated downward via the sheep SR, and the balance weight W is raised.

When the car C reaches a preset deceleration start position P1, the speed pattern generating means SP issues a deceleration command according to the distance from the stop position by relative operation with the position detection device Pc of the corresponding car C. emanate. The deceleration start position PI is calculated by counting pulses generated by the speed generator PG using the microcomputer Me.

In addition, the stop position is determined by counting the pulses generated by the speed generator PG and measuring the floor height from the standard floor to each floor when the elevator is installed.
Let F memorize it.

After the deceleration start position P of the endmost floor, the endmost floor forced deceleration position command device Q is installed at a position P2 separated by a predetermined distance. If the deceleration start command is not issued when the position P1 is reached, the forced deceleration position command device Q on the farthest floor is at the 1st position P2.
works.

A predetermined deceleration command is forcibly issued, the elevator is forcibly decelerated, and the elevator is prevented from going too far from its original landing level. Then, if it goes too far, the position detection device R installed at position P3 near the 1st landing level
is activated, and the induction motor M is braked by an electromagnetic brake that provides mechanical braking force.

However, the above operation is problematic if the digital floor controller DF memorizes the floors normally.
If the digital floor controller DF incorrectly stores the floor for some reason, the height of the first floor will be different from the actual height, causing inconvenience.

Hereinafter, an example in which this inconvenience occurs will be explained using FIGS. 2 and 3.

Fig. 2 is a diagram showing an elevator hoistway, and shows an example of an elevator hoistway with floors ranging from IF on the 1st floor to 101'' on the 10th floor.
The floor height between the IF floor and the 2nd floor is L2, and the floor height between the 9th floor and the 10th and 10th floors is L2.

<L2.

Assume that car C is now stopped on the 9th floor. On the other hand, it is assumed that the digital floor controller DF incorrectly stores that the car C is stopped on the first floor. For example, suppose that an ascending hall call HC occurs on the second floor 2F under such conditions. At this time, since the elevator control system remembers that the one-seater car C is stopped at the first floor IF, the control device is commanded to perform upward operation.

Therefore, the car C is actually operated upward toward the 10th floor 10F.

By the way, since the floor height is stored in the digital floor controller DF, if the predetermined deceleration distance is LD, deceleration starts after traveling a distance of (L, -LD). On the other hand, the actual floor height is L2 (
<t, 1), the actual deceleration distance is L2 (LI LD)2LD (LI L2)
・・・・・・・・・(1), and from the required deceleration distance (
LI L2) becomes shorter. Moreover, since it cannot be determined that there is an abnormality, the vehicle cannot be sufficiently decelerated at a predetermined floor landing level and has a certain speed, and the first position detection device R operates to activate the electromagnetic brake and come to a stop. However, at this point, the stopping is already delayed, and the predetermined landing level is considerably exceeded.

FIG. 3 is an output characteristic diagram of the speed pattern generating means SP of FIG. 1, and the above relationship is also shown in FIG.

P is the original deceleration start position, and P2 is the position of the endmost floor forced deceleration position command device Q. In the above case, the deceleration start position is P1+, and the deceleration starts from this position.Moreover, since the elevator decelerates according to a predetermined deceleration pattern, it cannot stop at the position ItP, where it should originally stop, and the elevator decelerates from this position. The motor is stopped at position P by an electromagnetic brake in response to a command from position detection device R provided at position P3 near .

In the above, the actual deceleration start position P1+ is behind the position P2 of the forced deceleration position command device Q on the farthest floor (on the landing level side)
In such a case, the end floor forced deceleration position command device Q will work effectively, and even if the speed command is at the preset speed level ■1, the speed will be decelerated according to the original speed command pattern. The vehicle stops near the stop position P4, and the landing error at that time is approximately ΔL, which corresponds to Vl, and does not cause any practical problems.

As mentioned above, when the actual deceleration start position P1+ is between the regular deceleration start position P1 and the position P2 of the end floor forced deceleration position command device Q, the balance weight W is moved to the buffer B, (the (see Figure 2), which is unfavorable from a safety standpoint. However, if the above-mentioned conditions occur during descending operation, the 1-car car C will move to the buffer B1 (see Figure 3).
collision may occur and must be avoided at all costs.

The present invention has been made in view of the above, and an object of the present invention is to provide an elevator control device that can always safely stop the elevator at the endmost floor.

A feature of the present invention is that when the distance from the position at which the deceleration start command means is activated and the deceleration start command is issued to the forced deceleration position on the farthest floor is shorter than a preset distance,
The present invention is at the beginning of a configuration that includes means for enabling the forced deceleration position command device on the farthest floor and forcibly switching the deceleration command to a deceleration command at a preset level corresponding to the forced deceleration position on the farthest floor.

The present invention will be described below with reference to FIGS. 6 and 7.
This will be explained in detail using FIGS.

FIG. 4 is a diagram showing the actual speed of the elevator. When the elevator is operating normally, the speed command becomes smaller and the elevator decelerates from the original deceleration start position P1 at the endmost floor. -Then, by the time it passes the position P2 of the forced deceleration position command device Q on the farthest floor, it has traveled a preset distance S corresponding to the area shown by notching in Fig. 4, and continues to use the original speed command pattern. The vehicle decelerates accordingly and stops at the first landing level P4. The only variation in the distance S is the installation error ΔS of the forced deceleration position command device Q on the farthest floor, and as long as the elevator operates normally, the distance between %P and P2 will be (S±ΔS).

In the present invention, focusing on (S±ΔS), the distance from the position when the deceleration start command device operates and the deceleration start command is issued to the position P2 of the forced deceleration position command device Q on the farthest floor is set in advance. If the distance is shorter than the specified distance (S±ΔS),
The end floor forced deceleration position command device Q operates and forcibly switches the speed command to level ■, (see Figure 3) at the preset position P2, and thereafter decelerates according to the original speed command pattern. Habo regular implantation level P4
I made it stop.

On the other hand, if the above distance is longer than '(S+ΔS), is the forced deceleration position finger? Force, Q are invalidated, and all speeds are decelerated according to the original speed command pattern.

FIG. 5 shows the speed pattern generating means SP according to the present invention.
The above concept will be explained in further detail using FIG. 5, which is an output characteristic diagram (see FIG. 1). The digital floor controller DF (see Figure 1) is out of order.
Suppose that the conditions as explained using the figure are met. In this case, the deceleration start position is one position shifted from the normal deceleration start position PI to the landing level P4 side, and the deceleration command descends from this position, and the elevator decelerates. By the way, the distance from that position to position P2 where the endmost floor forced deceleration position command device Q is provided is shorter than (S±ΔS). Therefore, when the car C reaches the position P2, the endmost floor forced deceleration position command device Q is activated.

A deceleration command of level v1 at a preset position P2 is issued from the speed pattern generating means SP, and from then on, the elevator decelerates according to the original speed pattern, and as shown in the figure, the elevator decelerates to the normal landing level P and the vicinity. Car C stops.

FIG. 6 is a block diagram of the microcomputer MC shown in FIG. 1. The microcomputer MC includes a microprocessor unit (MPU) 20 as a central processing unit, and an MPU 20 as a central processing unit.
A counter 22 that counts output pulses from the speed generator PO connected to the PU 20 via an internal bus 21, and a peripheral interface for inputting digital signals from the forced deceleration position command device Q on the farthest floor to the microcomputer MC. An adapter (PIA) 23, a timer 24 that sets a flag at regular intervals to notify the MPU 20 of the passage of time, a random access memory (RAM) 25 that stores variables, etc. when executing a program, and a program that stores the program. Read-only memory (R
, OM) 26.

FIG. 7 is a flowchart showing an example of a program for processing a part related to the present invention in the MPU 20 of FIG. In step S1, the content A of the counter 22 at the start of deceleration is stored, and in step S2, the content B of the counter 22 at the time of operation of the forced deceleration position command device Q on the farthest floor is stored, and in step S3, (A- B) and (S±ΔS) are compared, and (A-B)≧(SΔΔ
If S), the process proceeds to step S4, where the extreme floor forced deceleration position command device Q is disabled and a deceleration command for normal deceleration is generated by the speed pattern generating means SP. (A-B)<
(S±ΔS), the process advances to step S5, where the end floor forced deceleration position command device Q is operated as described above, and the speed pattern generating means SP is controlled by the digital signal.
A preset level V corresponding to position P2
1 forced deceleration command is generated to perform 1 forced deceleration.

As explained above, according to an embodiment of the present invention, even if the digital floor controller goes out of order, the elevator can be safely stopped at the farthest floor, providing excellent safety. There is an effect that it can be done.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an elevator speed control device, Fig. 2 is an explanatory diagram showing elevator floors ascending and descending, Fig. 3 is an output characteristic diagram of a conventional speed pattern generating means, and Fig. 4 is an elevator speed control device. A diagram showing changes in actual speed; FIG. 5 is a diagram showing the output characteristics of the speed fluctuation according to the present invention; and FIG. FIG. 7 is a flowchart showing an example of a program for processing a portion of the present invention in MPtJK shown in FIG. P...Deceleration start position, Q...Forced deceleration position command device on the farthest floor 1MC...Microcomputer, DF
...Digital floor controller, SP...speed pattern generating means, C...car, PG...speed generator. Agent Patent attorney Hiroo Nagasaki (and 1 other person) Mo 1 Kuchigi 4moku r4 Takakoji 17I21

Claims (1)

[Claims] 1. deceleration start command means for issuing a deceleration start command when the car reaches the deceleration start position; speed pattern generating means for issuing a deceleration command when the deceleration start command is issued; and an endmost floor forced deceleration position command device that forcibly decelerates the car when it reaches the endmost floor forced deceleration position when the deceleration start command is not issued by the deceleration start command means even when the car reaches the endmost floor forced deceleration position. -, when the distance from the position at which the deceleration start command means is activated and the deceleration start command is issued to the extrememost floor forced deceleration position is shorter than a preset distance, the extremest floor forced deceleration 1. A control device for an elevator, comprising means for enabling a position command device and forcibly switching a deceleration command to a deceleration command at a preset level corresponding to the forced deceleration position of the farthest floor.