JPS6119547B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a device for generating a speed command signal for an elevator.

In order to decelerate the elevator car to provide a comfortable ride and to accurately land it on the floor where it is scheduled to stop, a speed feedback control method is used to control the speed of the car in accordance with a deceleration command signal. In recent years, it has been considered to perform this process in conjunction with an electronic computer.

In other words, the details will be described later, but if the basket is, for example, 5
When stopping at a floor, its maximum speed V ₁
(If you start from the first floor in line)
emits the first speed command signal _P1 of FIG. 1, and the car is speed-controlled in accordance with this signal. On the other hand, the maximum speed
When traveling at a speed V ₂ lower than V ₁ (if the line is 4
If the vehicle departs from the floor), the second speed indicator signal ₂ is emitted. Then, the second speed command signal P ₂ after acceleration is compared with the first speed command signal P ₁ during deceleration,
If V ₂ < P ₁ , output the second speed command signal P ₂ ,
If V ₂ >P ₁ , the first speed command signal P ₁ is output. As a result, the second speed command signal _P2 becomes almost equal to the value indicated by ABCD. Therefore, the second speed command signal _P2 starts to decrease rapidly at point c,
Car ride comfort deteriorates.

The present invention is intended to improve the above-mentioned problems, and aims to provide a speed command generation device for an elevator that can provide a good ride comfort at the start of deceleration even when traveling at maximum speed.

An embodiment of the present invention will be described below with reference to FIGS. 2 to 6.

In Figure 2, 1 is a hoisting motor, 2 is a sheave driven by the motor 1, 3 is a main rope, 4 is a cage, 5 is a counterweight, and 6 is an uphill system consisting of a switch installed on the cage 4. 7 is a floor, 8 is a cam installed in the hoistway and placed a predetermined distance A in front of the floor 7, 9 is coupled to the electric motor 1 and generates a pulse proportional to the rotation speed of the electric motor 1. Pulse generator, 1
0 is a counter that counts the number of pulses, 11 is a converter that converts the input into information for the electronic computer, 12
13 is the central processing unit constituting the electronic computer, and 13 is the deceleration command value corresponding to the change in the distance from the car 4 to the scheduled stopping floor 7 (hereinafter referred to as the remaining distance) and the speeds △V ₁ , △V ₂ in Fig. 3. , △V ₃ ...△V _i ...△V _o is stored in a read-only memory (hereinafter referred to as ROM), 14 is a write/readable memory (hereinafter referred to as RAM) that stores data in storage addresses, 1
Reference numeral 5 denotes a bus line such as an address bus or data bus, 16 a speed command generation device that generates an analog value of a speed command signal, and 17 a control device that controls the electric motor 1.

Next, the operation of this embodiment will be explained.

When the car 4 moves up, pulses are generated by the pulse generator 9 and counted by the counter 10.
On the other hand, when the car 4 reaches a predetermined distance A before the floor 7 scheduled to stop (the floor with a call), the position detector 6 detects the cam 8.
When engaged, the position detector 6 emits an output. When the central processing unit 12 detects this, the ROM 13
Read the distance A stored in RAM1.
4 to the specified address. Thereafter, the output of the counter 10 is inputted via the converter 11 at each calculation cycle, and the remaining distance to the scheduled stop floor 7 is calculated by calculating from the value written in the RAM 14. Then, deceleration command values corresponding to each of the remaining distances are sequentially read out from the ROM 13 and given to the speed command device 16 from the converter 11. here,
The deceleration command value is converted into an analog value and becomes a deceleration command signal _P1 , which controls the electric motor 1 through the control device 17, so that the car 4 smoothly decelerates and accurately lands on the floor 7 where it is scheduled to stop.

The above operation will be described using the flowchart shown in FIG. While the position detector 6 is not yet in operation, step 100 returns "N" and no processing is performed. When it works, it will say “Y” and go to step 10.
1, read the distance value A from ROM13,
Move to RAM14. The remaining distance is calculated in step 102, and the corresponding deceleration command _P1 is stored in ROM1 in step 103.
Read and output from 3. The above-mentioned process is repeated every calculation cycle to accurately land on the scheduled stop floor 7.

On the other hand, car 4 has a speed V ₂ lower than the maximum speed V ₁
When driving at speed, compare the second speed command signal P ₁ after the end of acceleration, and if P ₁ - P ₂ < V ₃ (V ₃ is a constant value) at time To, calculate the time as follows: The calculation period △t is calculated by calculating the rounding speed command signal _P3 which decreases as time passes.
Calculate each time. That is, the speed △V _i is read from the ROM 13 every calculation cycle △t, and P ₃ ←
(P ₁ −△V _i ). However, △V ₁ ＞△V ₂ ＞……
△Vi>△V _i+1 ...>△V _o and the calculation is performed until time T ₁ when △V _o =0. △t×n, that is, T ₀ -
T ₁ is usually set to 0.5 to 1 second. After time T ₁
P ₃ =P ₁ . Therefore, the speed command signal when traveling at speed _V2 is as shown in Figure 4.
abc′cd, and the speed command signal _P2 at the start of deceleration is rounded, so the riding comfort is improved.

The above operation will be described using the flowchart shown in FIG. It is assumed that the time value t and the variable i are each initialized to zero by other processing (not shown). In step 110, the second speed command signal _P2 and deceleration command signal _P1 are compared. If P ₁ - P ₂ <V ₃ , the result is "N" and no processing is performed. _P1
- If P ₂ V ₃ , the result is "Y" and the process moves to step 111. If the time value t for setting the time value t to the current value has not reached the calculation cycle △t, the result is "N" and no processing is performed. It ends in If it has been reached, the result is "Y" and the process moves to step 113, where the time value t is initialized and the variable i is incremented. In step 114, the speed change value ΔV _i corresponding to the variable i is read from the ROM 13. In step 115, the speed value △V is changed from the deceleration command signal P ₁ .
_i is subtracted, and the result is set as the rounded speed command signal P ₃ and output in step 116. In step 117, variable i
If it has not reached the final value n, it ends up being "N". If the speed has been reached, the flow then shifts to the first speed command signal _P1 shown in FIG. 5, and the landing is reached.

In addition, although uphill running was explained in the example, it is clear that the same explanation can be applied to downhill running.

As explained above, in the present invention, the first speed command signal starts decreasing when the car reaches its maximum speed and reaches a predetermined distance before the scheduled stop floor;
The second speed with a maximum speed lower than the maximum speed above.
When the difference between the speed command signals reaches a predetermined value, a value that gradually decreases from the predetermined value is subtracted from the first speed command signal over time, and this is continued until the value gradually decreases to zero. It is designed to be output from an electronic computer. As a result, the speed command signal at the start of subtraction is rounded, so that the riding comfort of the car can be improved.

[Brief explanation of the drawing]

FIG. 1 is a curve diagram of a speed command signal of a conventional elevator, FIG. 2 is a block diagram showing an embodiment of an elevator speed command generation device according to the present invention, and FIGS. 3 and 4 are a curve diagram of a speed command signal of a conventional elevator. It is a curve diagram of a command signal. 5 and 6 are flowcharts of the program. 1... Hoisting motor, 4... Car, 6... Upward position detector, 7... Floor, 8... Cam, 9... Pulse generator,
10...Counter, 12...Central processing unit, 13...Read-only memory, 14...Writable and readable memory,
16...Speed command generation device, _P1 ...First speed command signal, _P2 ...Second speed command signal, _P3 ...Rounding speed command signal. Note that the same parts in the figures are indicated by the same reference numerals.

Claims (1)

[Claims] 1 In a device that counts pulses corresponding to the moving distance of the car, inputs them into a computer, and generates a speed command signal based on the calculation, the specified distance of the floor where the car is scheduled to stop after the car reaches its maximum speed. a first means for emitting a first speed command signal that starts decreasing when it reaches the front; a second means for emitting a second speed command signal whose maximum value is a speed lower than the maximum speed; a speed difference detection means that is activated when the difference between the first speed command signal and the second speed command signal becomes equal to or less than a predetermined value while the car is being operated by the second speed command signal; storage means in which a subtracted value corresponding to each time value is stored and whose final value is zero; and the speed difference detecting means are operated to read out the subtracted value every time the time value elapses to determine the first speed. and third means for outputting a value subtracted from the command signal as a deceleration command signal.