JPH0122199B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an elevator control device that can reliably detect the car position.

Elevators are provided with car position detection devices because it is necessary to always know the car position in order to perform various controls when landing on a floor and during travel.

FIG. 1 is a schematic configuration diagram showing an example of a car position detection device commonly used in the past.
The basket 2 is a rope 3 with one end fixed to the basket 1.
A counterweight fixed to the other end, 4 is a sheave, 5 is an electric motor that moves the car 1 up and down by rotating the sheave 4, 6 is directly connected to the rotating shaft of the electric motor 5, and the number of revolutions of the electric motor 5 changes. A pulse generator that generates a proportional number of pulses, 7 a counting circuit that counts the pulses generated by the pulse generator 6, 8 a reading of the count value of the counting circuit 7 to detect the current position of the car. It is a microcomputer that 9 is a floor, 10 is a cam provided in the hoistway, and 11 is a position detector operated by the cam 10.

In the device configured in this way, the pulse generator 6 is activated every time the car 1 moves, for example, by 10 mm.
It is configured to generate 2 pulses. Therefore, the microcomputer 8 reads the value of the counting circuit 7 at each calculation cycle, for example, every 50 msec.
This read value is added to the current position of the car one calculation cycle before when the car 1 is going up, and subtracted when it is going down, and the calculation result is stored as the current position of the car, and then this counting circuit 7 is reset. By repeating such operations, the microcomputer 8 detects the current position of the car. In addition, basket 1
The current position of the car when the car 1 has landed on the lowest floor may be set to zero, or a certain value may be set with the first floor as a reference, and the current position may be set to increase or decrease as the car 1 moves up and down. In this way, the microcomputer 8 controls the elevator according to the position of the car 1, including when the car is traveling and when it is landing on the floor. In addition, when the car travel distance per pulse generated from the pulse generator 6 becomes smaller due to a decrease in the sheave diameter caused by aging of the sheave 4, or when the car 1 decelerates, the rope 3 and the sheave 4 may In the case of slipping, the current position of the car detected by the microcomputer 8 and the actual position of the car 1 are kept from deviating from each other. In other words, a hoistway cam 10 provided at a certain position from the floor 9,
Using this cam 10 and the position detector 11 on the car 1 that generates the opposing signal, the microcomputer 8 reads the signal of the position detector 11 every calculation cycle, and if there is this read signal, A method is used in which floor height data based on the lowest floor, which is written in advance in a read-only memory, is forcibly set as the current position of the car.

However, such correction of the car position data is only performed when the car travels at a low speed, that is, at the departure floor. Things that should have been done were not being done. This is because the traveling speed of the car 1 is high on the passing floor, so the pulse generator 6 generates a large number of pulses during the calculation period of the microcomputer 8. Therefore, the point in time when the position detector 11 generates a signal in opposition to the cam of the passing floor and the microcomputer 8
If the timing of reading the signal from the position detector 11 does not match, forcibly rewriting the current position of the car to a pre-stored memory value will actually cause the car position to shift significantly. It turns out. Therefore, the position of the car is not corrected on the passing floor.

In response to this, an interrupt is sent to the microcomputer 8 using the signal from the position detector 11 at the passing floor, and at that point, the floor height data previously written in the read-only memory is forcibly updated. Although it is possible to rewrite the program, interrupt processing complicates the program and prevents the calculation cycle from being used to the limit, so it is not practical.

Therefore, the elevator control device according to the present invention suppresses the landing error to a sufficiently low level by accurately correcting the current position of the car even at the floors the car passes through. DESCRIPTION OF THE PREFERRED EMBODIMENTS An elevator control device according to the present invention will be described in detail below with reference to the drawings.

2 to 5 are circuit diagrams showing one embodiment of the elevator control device according to the present invention.
This will be explained in conjunction with the figures. FIG. 2 is a circuit diagram showing a specific example of the counting circuit 7 shown in FIG.
0a to 70c are NAND circuits, 71a to 71c are NAND circuits, 72a and 72b are RS time flip-flop circuits, and 73a and 73b are 4-bit 2-bit circuits.
digit counter, 74 is an AND gate circuit, UP,
DN is a rising and falling running signal supplied from the microcomputer 8, and RS is a reset signal supplied from the microcomputer 8, which resets the counters 73a and 73b and also resets the flip-flop circuits 72a and 72b. In addition, the output terminals Q _A of counters 73a and 73b
~Q _D outputs the counted value and supplies it to the microcomputer 8.

Next, FIG. 3 is a detailed diagram of the microcomputer 8 in FIG. port,
82 supplies a reset signal RS to the counters 73a, 73b and the flip-flop circuits 72a, 72b, and also supplies the NAND gate circuit 71 shown in FIG.
This is an output port that supplies UP and DN signals to 71b and 71c, respectively. In addition, 83 is an intermediate processing device (hereinafter referred to as
84 is a read-only memory (hereinafter referred to as "CPU") that stores programs executed by the CPU 83 and fixed data stored in advance.
Reference numeral 85 indicates a readable/writable memory (hereinafter referred to as RAM) for storing various data.

Figure 4 shows the microcomputer 8 shown in Figure 3.
This is a flowchart showing the execution of a program stored in advance in a ROM 84 in the computer, and is executed only once in each calculation cycle (for example, 50 msec).
That is, in step 41, the port numbers CT1 and CT2 of the counters 73a and 73b shown in FIG.
Read the value of and store this read information in RAM85.
The counters 73a, 73b and flip-flop 7 are stored in step 41a.
A reset signal RS is supplied to 2a and 72b. Next, in step 42, the running direction of the car 1 is identified, and DIR is set to 1, -1, or 0 depending on whether the car is ascending, descending, or otherwise. step 44
In this case, if the values of addresses DP1 and DP2 of RAM85 are equal, the current position FSY of the car is FSY
Set to +DIR×DP1. If they are not equal, the current position RSY of the car is determined by FSX +
Certified as DIR×(DP1−DP2).

Here, explanation will be given taking as an example the case where the car 1 is being raised. When car 1 is rising, car 2
Since the UP signal shown in the figure is "H" and the DN signal is "L", the counters 73a and 73b sequentially count the pulses generated by the pulse generator 6. Then, when the microcomputer 8 executes the process shown in the flowchart shown in FIG.
The current value FSY of the car is DIR is 1, and
Since DP1 and DP2 are equal, FSY = FSY + DP1, and the distance traveled by car 1 is added. In this way, the microcomputer 8 detects the current position of the car at each calculation cycle.

Here, when the car 1 reaches a predetermined position from the floor it passes, the position detector 11 provided at the top of the car 1 is turned on, and the signal 11a shown in FIG. 2 becomes "H". When the NAND gate circuit 71b detects the rise of such a logic level, the flip-flop circuit 72a is set and its output terminal becomes "L", so that the input terminal T of the counter 73b becomes "L". Therefore, this counter 73b will no longer count the pulses of the output pulse signal 6a of the pulse generator 6.
Therefore, when the microcomputer 8 goes to read the values of the counters 73a and 73b during the calculation cycle, since they are not equal, the current position FSY of the car is FSY=FSX+(DP1-
DP2). This indicates that the current position of the car has been accurately corrected by the signal from the position detector 11 on car 1. To explain this using the time charts shown in FIGS. 5A to 5D, the calculation cycle of the microcomputer 8 is not synchronized with the signal of the position detector 11. Therefore, if the dotted line shown in FIG. 5 is the timing at which the microcomputer 8 executes the flowchart shown in _FIG .
When reading the values of a and 73b, DP1 and
DP2, and the output signal 11 of the position detector 11
a rises between time points _T2 and _T3 .
In other words, it faces the cam 10 in this section. Therefore, the current position FSY of car 1 is
The floor height value corresponding to the passing floor is the value of (DP1−DP2)
FSY=FSY+(DP1-DP2), which is the sum of FSX, accurately represents the current position of the car at time _T3 , and accordingly, the car position has been correctly corrected. Furthermore, during descending travel, by detecting the fall of the output signal 11a of position detector 11, the car position can be corrected correctly in exactly the same way as during ascending travel. As a result, even if the car position is corrected correctly on the passing floor where car 1 passes and the travel distance of car 1 increases, a deceleration command is issued at the appropriate position, and thereby Therefore, the landing error can be kept extremely low.

In the above embodiment, a case has been described in which the current position of car 1 is detected, and a hoistway cam and detector set at a certain distance from each floor are used. A position detector may be provided on each floor and a cam may be provided on the car, or a plurality of position switches may be provided on each floor, each installed at a predetermined position, to determine the car position at multiple points for each floor. You can modify it. In addition, in the above embodiment, the current position of the car is corrected by using the rising position of the position detector when traveling upwards and the falling position when traveling downward; Exactly the same effect can be obtained by using Furthermore, the counter 73b in FIG. 2 does not necessarily have to be a counter, and a circuit that stores the value of the counter 73a when the output signal is generated from the position detector 11 may be used instead. Also, the binary counter 73b in FIG.
Although the counting operation is configured to be stopped by the output signal of the position detector 11, the counting operation may be started by the output signal of the position detector 11.

As explained above, according to the elevator control device according to the present invention, the pulses are counted when the pulses generated as the car runs are counted and the counted value is imported into the microcomputer for control. Two counters are used, one counts the pulses for each calculation cycle of the microcomputer,
The other one is configured to stop counting depending on the position of the hoistway, so the current position of the car can be accurately detected, and the landing error can be sufficiently reduced. It has an excellent effect of being able to be kept small.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of a conventional elevator control device, FIG. 2 is a circuit diagram showing an embodiment of a counting circuit used in the elevator control device according to the present invention, and FIG. 3 is a circuit diagram showing an example of a counting circuit used in the elevator control device according to the present invention. 4 is a flowchart of the processing executed in the microcomputer shown in FIG. 3, and FIG. 5 is a block diagram of the microcomputer shown in FIG.
FIG. 3 is a waveform diagram showing the operation of each part of the circuit shown in the figure. 1... Car, 2... Matching weight, 3... Rope, 4... Sheave, 5... Electric motor, 6... Pulse generator, 7... Counting circuit, 8... Microcomputer, 9... Floor Floor, 10...Cam, 1
1...Position detector, 70a-70c...Knot circuit, 71a-71c...NAND circuit, 72a, 7
2b...Flip-flop circuit, 73a-73b
... Counter, 74 ... And gate circuit, 81
...Input port, 82...Output port, 83...
Microcomputer, 84... Read-only memory (ROM), 85... Read-only memory (RAM). Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] 1. A pulse generator that generates pulses as the car moves, a first counter that counts the pulses from the pulse generator, and a position detector that outputs a signal when the car passes a predetermined distance from each floor. It counts the pulses from the pulse generator and the pulse generator, and when the output signal from the position detector is input, it stops counting or clears the counted value when the car passes the position at the predetermined distance. , the second counting the subsequent pulses
Equipped with a counter and a microcomputer,
The microcomputer receives the counted value of the first counter and the counted value of the second counter, and detects the current position of the elevator car based on the counted value of the first counter when the position detector is not operating. However, when the position detector is in operation, it is based on at least the counted value of the second counter and the floor height data value from each floor to a position a predetermined distance away from each floor with the predetermined floor stored in the internal memory as a reference. An elevator control device, characterized in that it is configured to detect the current position of an elevator car.