JP2633828B2 - Elevator end floor deceleration monitoring device - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to an elevator end-floor deceleration monitoring device, and is particularly suitable for an elevator control device having an operation control system and a speed control system, each of which is a digital computer. The present invention relates to an end floor deceleration monitoring device for an elevator.

[Background of the Invention]

In a conventional elevator which is not made into a digital computer, for example, as shown in an elevator terminal floor speed control device of Japanese Patent Application Laid-Open No. 54-83256, a plurality of position detectors are provided near an end floor. In a system different from the normal deceleration control system of the elevator, the deceleration command is forcibly issued by the signal of the position detector.
Even if the normal deceleration control system breaks down, it is forcibly decelerated at the end floor.

However, in elevators in which the speed control system is a digital computer, especially in inverter control, it is difficult to perform backup with a separate control system as in the past, and therefore, it is difficult to perform deceleration monitoring control at the end floor. There has been a strong demand for reliability.

[Object of the invention]

The present invention has been made in view of the above, and an object of the present invention is to provide an elevator end-floor deceleration monitoring device capable of improving the reliability of end-floor deceleration monitoring.

[Summary of the Invention]

The feature of the present invention includes a position detector that operates when the elevator reaches a predetermined position just before the end of the floor, and the operation of the elevator such as call registration is performed from the time the position detector operates until the elevator stops. A first digital computer for controlling the operation and a second digital computer for comparing the speed command and the actual speed signal to control the speed of the elevator independently monitor the speed of the elevator independently of each other. When the digital computer detects that the speed of the elevator has exceeded a predetermined speed, the digital computer issues an emergency stop signal for the elevator.

[Action]

When the speed control system of the elevator is made into a microcomputer as described later, it is desirable to leave the function of generating a speed command and the function of comparing the speed command with the actual speed signal to software processing of the microcomputer. This is a function that the computer is good at.

The present invention has been made on the premise of this. In this case, in the extension of the above-described conventional technology, (1) a separate system independent from the normal speed control system, and (2) an abnormality in the normal speed control system. It is difficult to construct an end story stop device that forcibly decelerates in a certain state in a reliable manner.

Therefore, as described above, the speed of the elevator when approaching the end floor is independently monitored by both of the two digital computers whose functions are distributed, and one of the digital computers is controlled by the reference computer. The emergency stop of the elevator is detected by detecting that the value has been exceeded. That is, in the present invention,
(1) A speed command peculiar to an end floor must not be given as a speed command of a normal speed control system, and a speed monitoring system of a double elevator independent of each other is separately provided; 2) In the case where these speed monitoring systems operate, the deceleration control means similar to the normal speed feedback control system is not reliable, and any of them detects that the speed exceeds a predetermined speed (reference value). Even in the event of an emergency stop of the elevator, a highly reliable and safe end floor deceleration monitoring device is realized.

[Embodiment of the Invention] Hereinafter, the present invention will be described in detail with reference to the embodiment shown in FIGS. 1 to 3 and FIG.

FIG. 1 is an overall configuration diagram showing an embodiment of an elevator provided with an end floor deceleration monitoring device according to the present invention. In FIG. 1, 1 is an elevator equipment, 2 is an elevator control device, and the elevator equipment 1 is a well-known car.
10 and a counterweight 11 are suspended from a pulley 13 via a rope 12, and an electric motor device 14 for driving the car 10 is connected to the pulley 13. In addition, each floor 15 ₁ on the building side
To 15 _n (if n floor) has a position detector 16 ₁ in front of each end floor, 16 ₂ is provided with, the position detector 16 _1, 16
₂ is adapted to operate when pressed by a cam 17 attached to the car 10.

On the other hand, the elevator control device 2 is composed of two digital computers, input devices 20, 21, output devices 30, 31, microprocessor units (hereinafter referred to as MPU) 40, 41 for performing logical operation, and MPU 40. Clock generators 50 and 51, which generate clock signals for
Peri-hyal interface adapters (hereinafter referred to as PIA) 60 and 61 for communicating signals between 40 and 41, read-only memories (hereinafter referred to as ROM) 70 and 71 for storing programs for elevator control contents, and signal It comprises random access memories (hereinafter referred to as RAM) 80 and 81 as storage devices.

With the following configuration, the elevator control device 2 inputs various signals from the elevator equipment 1 through the input devices 20 and 21 and calculates the MPUs 40 and 41 in accordance with the control contents programmed in the ROMs 70 and 71, respectively. The results are output to the elevator equipment 1 via the output devices 30 and 31, respectively, and each device is controlled.

Here, the MPUs 40 and 41 share various control functions for elevator control, and the MPU 40 performs call control, door control, and the like, while the MPU 41 performs speed control. The use of a digital computer as an elevator control is described in GB 2025663 (198
The details are omitted here.

Next, a characteristic part of the present invention will be described. FIG. 2 is an explanatory diagram showing one embodiment of a portion related to the terminal floor deceleration monitoring device of the present invention in FIG. In FIG. 2, reference numeral 18 denotes a rotary encoder connected to the motor device 14 of the elevator shown in FIG. 1, which generates a pulse-like signal synchronized with the rotation of the motor shaft. The speed of the elevator can be detected by counting the pulse signal. In the figure, reference numeral 90 denotes a relay which is turned on in response to the AND condition of the output signals a ₁ and a ₂ from the output devices 30 and 31, and the motor device 14 is turned on by a relay signal A 1 from the relay 90.
Control. That is, the operation of the relay 90 enables the motor device 14 to operate. The circuit for this is
Since it can be realized by a general circuit configuration and is not directly related to the present invention, the description is omitted here.

The signals of the rotary encoder 18 and the position detectors 16 ₁ and 16 ₂ used for detecting the speed of the elevator are similarly input to both of the input devices 20 and 21, and the relay 90 for controlling the motor device 14 is , And can be released from any of the output devices 30 and 31.

Next, with reference to FIG. 2, the contents of deceleration monitoring at the end floor which are independently executed by the MPUs 40 and 41 of FIG. 1 will be described with reference to the flowchart shown in FIG. Contents shown in FIG. 3, each at predetermined time intervals (e.g., every several tens of m _sec) MPU 40,
Run at 41. First, it is determined in step S1 whether or not the elevator is traveling. If the vehicle is traveling, the traveling direction is determined in step S2.
Determining a signal of the position detector 16 ₁ in step S3, the rising case determines the signal of the position detector 16 ₂ at step S4. This is to monitor the speed when the elevator is traveling toward the end floor. Then, when the position detector 16 ₁ or 16 ₂ is activated, step S5, S6
Performs an initial setting of a reference value serving as a reference for speed monitoring. Next, in step S7, the set reference value is compared with the actual speed of the elevator calculated from the input signal of the rotary encoder 18 shown in FIG. 2, and if the actual speed is smaller than the reference value, the step is performed. In S8, the reference value is updated, and preparation for the next predetermined time is prepared. However, when an than the reference value of the actual speed is large, emits an emergency stop signal elevators at step S9 (This means that the cross-sectional output signal a ₁ or a ₂ for relay 90 of FIG. 2 ), Stop the elevator immediately.

FIG. 4 is a diagram showing the relationship between the reference value and the actual speed, in which the horizontal axis represents time and the vertical axis represents speed, wherein a indicates the actual speed of the elevator, and b indicates the reference value. As can be seen, the reference value is initialized excisional when the position detector 16 ₁ or 16 ₂ is operated, then, it will be updated every predetermined time. In this update, a predetermined margin is provided for the case where the elevator decelerates normally. Here, if the deceleration cannot be performed for some reason and the actual speed is at point ₁ and the deceleration becomes slow as shown at point ₂ ,
The actual speed overlaps the reference value and an emergency stop signal for the elevator is generated.

According to the above-described embodiment of the present invention, the speed control is implemented by a digital computer, and even if it is difficult to have an independent backup control system separate from the normal speed control system, two digital computers are used. Independent speed monitoring ensures that even if an abnormality occurs in the normal speed control system, the abnormality can be reliably determined and the elevator can be stopped immediately, so that Deceleration monitoring device.

In the above-described embodiment, the reference value at the end floor is updated every predetermined time. However, this may be updated according to a predetermined distance, and the effect is the same.
Further, it goes without saying that the speed detection may be performed by another method.

〔The invention's effect〕

As described above, according to the present invention, the terminal floor deceleration monitoring is independently performed by the two digital computers, and if any one of them is detected as abnormal, the elevator is immediately stopped by an emergency. There is an effect that the reliability of floor deceleration monitoring can be improved.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of an elevator provided with a terminal floor deceleration monitoring device according to the present invention, and FIG. 2 is a diagram of a portion related to the terminal floor deceleration monitoring device of the present invention in FIG. FIG. 3 is a flowchart showing one embodiment of processing of each MPU in the elevator end floor deceleration monitoring device of the present invention, and FIG. 4 shows a relationship between a reference value and an actual speed. FIG. 1. Elevator equipment 2. Elevator control device. 14 ... Motor device, 16 ₁ , 16 ₂ … Position detector, 18…
… Rotary encoder, 20,21 …… Input device, 30,31…
… Output device, 40,41… MPU, 90 …… Relay.

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hideaki Takahashi 1070 Ichige, Katsuta-shi Mito Plant of Hitachi, Ltd. (56) References JP-A-58-2176 (JP, A) JP-A-53-43351 (JP, A)

Claims (1)

(57) [Claims] An elevator control apparatus comprising a first digital computer for controlling operation of an elevator such as call registration and a second digital computer for comparing the speed command and an actual speed signal to control the speed of the elevator. , A position detector which operates when the elevator reaches a predetermined position just before the end of the floor, wherein the first and second digital computers independently operate the time or traveling starting from the operation of the position detector. A speed reference value that decreases as a function of distance is created and configured to generate a predetermined signal when the speed of the elevator exceeds the speed reference value, and one of the digital computers generates the predetermined signal. Elevator emergency stop means provided in response to occurrence Floor deceleration monitoring device.