JPH0768020B2 - Elevator control equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator control device capable of accurately maintaining a stop position of an elevator car when the elevator is stopped.

[0002]

2. Description of the Related Art Generally, the entire construction of an elevator control system is as shown in FIG. That is, in the figure, 1 is a speed command device which generates a speed command signal 1a from acceleration to deceleration stop of the elevator, 2 is a speed detection device which generates a signal corresponding to the speed of the elevator car 10, for example, a speed signal 2a of the electric motor, 3 is a speed controller that generates a current command signal 3a by comparing the speed command signal 1a and the speed signal 2a, and 4 is a current command signal 3a and a current signal 5 from the main circuit current detector 5.
a is a current regulator that generates a phase control signal 4a by comparing with a, 6 is an armature of a DC motor that drives an elevator,
It is connected to the thyristor Leonard device 7, which receives the phase control signal 4a as an input signal.

Reference numeral 8 is a sheave mechanically coupled to the electric motor armature 6, and 9 is a main rope connecting an elevator car 10 and a suspension weight 11. Further, a landing detection device 12 is attached to the elevator car 10, and a zero signal is detected at the normal landing point as shown in FIG. 3 depending on the relative position to the landing detection plate 13 attached to each floor of the hoistway. A landing signal 12a is generated so that

In such an apparatus, the elevator which has been accelerated or decelerated by the speed command signal 1a from the speed command device 1 inputs the landing signal 12a to the speed adjuster 3 by the operation of the switch SW in the vicinity of the landing and then arrives at the floor. Control is performed.

Further, even when the elevator car 10 is stopped at a regular landing position on an arbitrary floor, when a passenger gets on or off, the main rope 9 expands or contracts to lift or sink the elevator car 10 and the elevator car 10 is lifted. A step (hereinafter referred to as a level error) is generated between the floor of the car 10 and the floor FL, but in this case as well, floor alignment is performed again at the regular landing position by the landing signal 12a.

[0006] By the way, as is well known, the demand for the flooring accuracy of an elevator car is extremely strict, and is generally ± 1.
It should be about 0 mm, and especially for high-end models, it should be less than ± 5 mm.

Therefore, it is possible to devise the landing detection plate 13 as a guide plate having a special shape so as to improve the landing accuracy, but it takes time and labor to process and the cost is increased. Further, since the landing signal 12a greatly changes depending on the shape of the guide plate, it is difficult to always optimize the riding comfort of the elevator.

Therefore, as shown in FIG. 4, an elevator car position detecting device near the floor is provided with, for example, inductor relays IR1 and IR2 which may be reed switches and permanent magnets (or photoelectric devices composed of a projector and a light receiver). The elevator car 10 is provided with a simple device composed of a rectangular shield plate 23 (which may be a light shield plate) made of plain steel.
Is present between the ± S ₁ point (± 125 mm in the normal case) and the ± S ₂ point (± 10 mm in the normal case) before the level, the inductor relays IR1, IR2 shown in FIG.
Based on the operation of the
By giving a to the speed controller 3, the elevator car 10 is always kept within a predetermined level range by cutting when reaching a point ± S ₂ before the level.

[0009]

However, in the case of elevator operation such as re-floating operation, the load fluctuates very frequently due to passengers getting on and off.
The elevator car 10 follows a very poorly,
As a result, the actual floor alignment movement distance of the elevator car 10 varies, and it is not possible to always obtain a satisfactory landing accuracy.

This means that even if the speed regulator 3 of the elevator control system is configured as a so-called PI system to eliminate the steady deviation as shown in FIG. 6, the control system always changes its steady state due to the load fluctuation. It did not lead to a fundamental solution to the above problem. The present invention has been made in view of the above points, and in particular, an object thereof is to provide an elevator control device including a landing command generation device that can obtain a satisfactory landing accuracy during re-floating operation. To do.

[0011]

SUMMARY OF THE INVENTION The present invention comprises a speed detecting device for generating a speed signal according to the speed of an elevator car, and by associating the speed signal with a landing command signal,
In the feedback control of the speed of the elevator car near the floor, an elevator car position detection device that detects that the elevator car is present at a predetermined point near the floor is provided, and the elevator car position detection device receives the speed signal as an input. A proportional integral element for continuously calculating a voltage V _C corresponding to an actual moving distance of the elevator car from a predetermined point and a voltage V _R corresponding to an expected moving distance thereafter,
There is provided a landing command signal generation device which issues a square wave landing command signal based on a comparison between the voltage (V _C + V _R ) and a distance set value corresponding to a predetermined point.

[0012]

With the above construction, the level adjustment is automatically performed according to the actual elevator car speed.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing the entire elevator control system according to the present invention, and FIG. 7 is an internal circuit diagram of the landing command signal generator in FIG. In the drawings, the same reference numerals as those in FIGS. 2 to 5 designate the same components, but 30 is the landing signal 23a of the inductor relay IR and the speed signal 2a of the speed detecting device 2.
Based on the above, a landing command signal generator for issuing a landing command signal 30a according to the present invention, OP1 and OP2 are DC operational amplifiers, C is a capacitor, D is a diode, R1 to R5 are resistors, VR is a variable resistor, and IR. _a is an inductor relay IR
Both 1 and IR2 are closed until they reach a position facing the shield plate 23, and a contact that opens when the elevator car 10 reaches a position ± S ₂ before the level, that is, a positive power source. Voltage.

8A and 8B, the elevator car 10 deviates below the floor by a predetermined value or more due to passengers getting on and off the vehicle (the same applies when the elevator car 10 deviates by more than a predetermined value or more), and FIG.
If the square wave landing command signal 30a shown in (a) is input to the elevator control system having the delay element shown in FIG.
The elevator car 10 is operated as shown in FIG. 8 (b).

Therefore, when the elevator car 10 is operated as described above, the voltage of each part in FIG. 7, that is, the voltage V _c across the capacitor and the output voltage V _{OP1 of the} DC operational amplifier _OP1.
Is a value having the following physical meaning.

That is, since the contact IR _a is closed until the elevator car 10 starts rising and reaches the point S ₂ before the level, both the voltages V _c and V _OP1 maintain OV, but S _When passing through the _two points, the contact point IR _a opens, so the capacitor C starts to accumulate electric charges, and the voltage V _c (the value obtained by integrating the speed signal 2 a, which is proportional to the distance actually moved by the elevator car 10 from the S ₂ point. ) Begins to show.

The voltage V _R across the resistor R ₂ is the flow distance from the current speed after passing the point S ₂ , that is, the elevator car 10 after the landing command signal 30a becomes zero.
It shows a value proportional to the moving distance of. That is, assuming that the response time constant of the elevator control system is τ, the flow distance L from an arbitrary elevator car speed V ₀ is expressed by the _equation 1.

[0018]

[Equation 1]

Therefore, by setting τ = R ₂ / R ₁ , the output voltage V _{OP1 of the} DC operational amplifier OP 1 shown in FIG.
Indicates the moving distance of the elevator car in consideration of the flow distance (expected distance), and this is the predetermined S
_{It is only} necessary to compare the set voltage V _P indicating the level error (distance corresponding to the S ₂ point) at _two points with the DC operational amplifier OP2 and drop the landing command signal 30a to zero when the voltage matches the set voltage V _P. I understand.

Therefore, the DC operational amplifier OP shown in FIG.
By passing the output voltage V _OP2 of _{No. 2} through the diode D, the waveform can be converted into the landing command signal 30a shown in FIG.

By inputting such a landing command signal 30a into the speed controller 3 and performing feedback control, the actual speed of the elevator car can be adjusted according to the actual speed of the elevator car, even if the load changes significantly due to passengers getting on and off. Accurate control is possible with the flow distance taken into consideration.

In the embodiment, the switch SW is used to switch between the speed command signal 1a and the landing command signal 30a for input, but the landing command signal 30a is input to the speed command device 1, Switching within the speed command device 1,
The control system may be configured such that the landing command signal 30a is added to the speed command signal 1a (the speed command signal 1a is of course zero at the time of re-flooring, so that the same thing as when switching is performed). However, the present invention is not limited to the embodiment because it is possible.

[0023]

As described above, according to the present invention, the elevator car is controlled by the landing command signal in consideration of the distance actually moved by the elevator car and the distance the elevator car will move from now on. In addition, the elevator landing position can be maintained automatically. Further, the elevator car position detecting device for obtaining the landing command signal can be configured by an extremely simple device.

[0024]

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an entire elevator control system according to the present invention.

FIG. 2 is a configuration diagram showing an entire conventional elevator control system.

FIG. 3 is a waveform diagram of a landing signal 12a in FIG.

FIG. 4 is an explanatory diagram of a level detection mechanism of an elevator car position detection device.

5 is an operation explanatory view of the elevator car position detecting device in FIG. 4. FIG.

FIG. 6 is a block diagram of an elevator control system in FIG.

7 is a detailed circuit diagram of a landing command generation device 30 in FIG.

FIG. 8 is a signal waveform diagram of each part in FIG.

[0025]

[Explanation of symbols]

IR, IR1, IR2 inductor relay 2 speed detection device 2a speed signal 10 elevator car 12 landing detection device 23 shield plate 23a landing signal 30 landing command signal generator 30a landing command signal OP1, OP2 DC operational amplifier C capacitor R _{1 to} R ₅ Resistance V _C Voltage corresponding to the actual moving distance of the elevator car VR _R Voltage corresponding to the expected moving distance thereafter V _P S ₂ Set voltage indicating the distance corresponding to the point

Claims (2)

[Claims] 1. A speed detection device that emits a speed signal according to the speed of an elevator car, wherein the speed signal of the elevator car near the floor is feedback-controlled by associating the speed signal with a landing command signal. In, the elevator car is provided with an elevator car position detection device for detecting that it exists at a predetermined point near the floor, the actual speed of the elevator car from the predetermined point by the elevator car position detection device as an input A proportional integral element for continuously calculating a voltage V _C corresponding to the moving distance and a voltage V _R corresponding to the expected moving distance thereafter is provided, and the voltage (V _C + V _R ) and the distance setting corresponding to the predetermined point are set. An elevator control device, comprising: a landing command signal generator that outputs the square-shaped landing command signal based on a comparison with a value. 2. The proportional-plus-integral element of claim 1 is configured by connecting a series circuit of a resistor R ₁ to the input part of a DC operational amplifier and a capacitor and a resistor R _{2 to} the feedback part, and connecting the resistor R ₂ to the resistor R ₂ . _While setting the ratio of _{1 to} the response time constant of the elevator control system, connect the normally closed contacts at both ends to the series circuit,
2. The elevator control device according to claim 1, wherein the elevator car position detection device is an electronic circuit that opens the normally closed contact when an elevator car is detected.