JPS6210915B2 - - Google Patents

Description

[Detailed description of the invention]

This invention relates to an improvement in a device for digitally detecting the position of an elevator. Recently, the position of an elevator car can be detected by generating an electrical digital pulse signal synchronized with the running of the car from the rotation angle of the hoisting machine sheave, governor car, etc., and continuously counting this signal. , devices that detect the car position are emerging. However, this is a so-called relative position detection in which the car position is detected by detecting the amount of movement of the car. Due to wear, the electrical digital pulse signal no longer corresponds to the distance traveled. Furthermore, mechanical errors such as production tolerances in the diameter of the hoist sheave or governor wheel or the diameter of the rope directly appear as errors in car position detection. Therefore, in the case of such car position detection, it is necessary to correct the above-mentioned error. One of them is shown in Figure 1. In the figure, 1 is the elevator car, 2 is the counterweight, 3 is the main rope that connects the car 1 and the counterweight 2, 4 is the sheave around which the main rope 3 is wrapped, and 5 is the sheave that drives the sheave 4. A hoisting machine, 6 is a speed governor rope formed in an endless shape, one side of which is fixed to the car 1, and arranged along the hoistway, 7 is a tension wheel that applies downward tension to the speed governor rope 6, 8 is a The governor wheel 9, around which the governor rope 6 is wound, is directly connected to the governor wheel 8, and is proportional to the moving distance of the car 1.When the car 1 is going up, a rising pulse is generated, and when it is going down, it is a descending pulse (in this case, the car 1 9a is the output pulse, and 10 is a switch group that sets predetermined distance data corresponding to the number of output pulses 9a. Setting device, 11 is output pulse 9
a correction direction switch for commanding the direction of correction of a;
2 is a pulse processing device; 13 is a counter that counts and outputs input I; and is reset when input R becomes "H"; and 14 compares input A and input B, and when they match, the output is "H". ” comparator, 15
When input A is "H" and input B becomes "H", it blocks the passage of the pulse of input C, and input A becomes "L".
When input B becomes "H", the pulse of input C is doubled, and when input B is "L", input C is output as is. 16 is a pulse corrector that adds when the input is a rising pulse, It is a reversible counter that subtracts the signal when it is a falling pulse and outputs it as a car position signal 16a. That is, when the car 1 is driven by the hoist 5, the governor wheel 8 rotates according to the direction of movement, and the pulse generator 9 generates pulses 9a according to the distance and direction of movement of the car 1. Occur. Here, when the car 1 is in the ascending operation, the pulse generator 9 outputs ascending pulses, and the counter 13 counts the number of pulses. On the other hand, the pulse 9a passes through the pulse corrector 15 and is added up by the reversible counter 16, so that the car position signal 16a continues to increase. Now, when the car 1 travels a predetermined distance S [m], the pulse generator 9 should output 1000S/10 = 100S pulses. Here, if more x pulses are output, the correction is made to reduce the x pulses. is required. Therefore, in this case x/100S×100 [%]
This is a negative correction of
This means a positive correction of 0 [%]. Here, if we try to correct it in 0.1% increments from 0.1% to 1%, and if x = 1 at 1%, the distance S and the count value of the counter 18 when traveling that distance are as follows. It becomes like this.

[Table] Therefore, the count value of the counter 13 for the necessary correction factor is set in advance using the setting device 10, and if the correction is negative, the correction direction switch 11 is closed and a negative correction command is issued. If it is a positive correction, the correction direction switch 11 may be opened and a positive correction command may be given to the pulse corrector 15.
That is, for a negative correction of 0.1%, when the setting device 10 is set to a value of "1000" and the correction direction switch 11 is closed, the counter 13 counts 1000 rising pulses from the pulse generator 9. At this time, the output of the comparator 14 becomes "H". Now, counter 13
is reset, and a correction command is given to the pulse corrector 15. In response to this correction command, the pulse corrector 15 operates so as not to output one of the rising pulses from the pulse generator 9. As a result, the amount of increase in the car position signal 16a of the reversible counter 16 is
0.1 than the number of output pulses 9a of the pulse generator 9
% will decrease, and a negative correction will be made. Similarly, in the case of positive correction, the correction direction switch 11
When is opened, every 1000 rising pulses passing through the pulse corrector 15 are converted into twice as many pulses,
The amount of increase in the car position signal 16a of the reversible counter 16 is greater than the number of output pulses 9a of the pulse generator 9.
0.1% more. Further, when the car 1 is in a descending operation, the operation is the same except that the pulse 9a of the pulse generator 9 is changed to a descending pulse. However, in the above-mentioned pulse correction, the number of output pulses of the pulse generator 9 that determines the correction rate, that is, a value corresponding to the moving distance of the car 1 must be set using the setting device 10. Moreover, the correction factor and the set value are in an inversely proportional relationship, and the smaller the correction factor, the larger the set value becomes. In order to make highly accurate corrections, the range of the set value must be wide and fine. , many setting switches are required. In addition, the correction value is determined by actually running car 1.
It is necessary to actually measure the car position detection error, and it is necessary to periodically change the setting of the correction value. This invention improves the above-mentioned problem by modulating the frequency of the pulse according to the amount of movement of the car, correcting the pulse when there is a difference between the car position and the absolute position, and counting this to calculate the car position. It is an object of the present invention to provide an elevator position detection device that can correct the pulses with an appropriate correction factor against the change in pulses over time by detecting the pulses, and can accurately detect the car position. An embodiment of the present invention will be described below, but first,
The pulse correction operation used in this invention will be explained. In the figure, 17 is a modulator that modulates the frequency of the pulse of input B according to the modulation rate data set to modulation rate input A, and 18 is a modulator that counts the input pulses and outputs "H" when the input pulses reach a predetermined value. '', the counter resets the count value to zero and starts counting again. Other details are the same as in FIG. Here, the modulation coefficient of the modulator 17 is K, and the modulation coefficient of the modulator 1 is K.
7's output pulse frequency is f, the modulation rate set by the setting device 10 is x, and the output pulse 9 of the pulse generator 9 is
If the frequency of a is _f1 , the predetermined value C set in the counter 18, and the output pulse frequency of the counter 8 is _f2 , then f= _Kxf1 f= _Cf2 . Therefore, the pulse correction rate [%] by the pulse corrector 15 is f ₂ /f ₁ ×100=Kx/C×100. Here, C=100, K=1/10, x=0,
If it is 1, 2, 10, then the modulation rate x = 0, 1, 2, 10 set by the setting device 10 is 0%, 0.1%, 0.2%, respectively. ...This means that pulse correction can be performed in 1.0% increments. Now, set the setting data value X of the setting device 10 to 1,
Assuming that car 1 is in ascending operation, the frequency of ascending pulse 9a is reduced to 1/10 by modulator 17 and by counter 1.
8 becomes 1/100. Therefore, the rising pulse 1000
Once every time, the pulse corrector 15 blocks the rising pulse in the direction commanded by the correction direction switch 11, that is, if it is a negative correction, it is converted into a twice the pulse and outputted if it is a positive correction. . By adding this in the reversible counter 16, the car position signal 16a is corrected by 0.1%. In this way, the pulse 9a associated with mechanical wear
Correction of changes over time and pulse 9 due to manufacturing errors
For correction of the change in a, a desired correction rate can be set arbitrarily and at equal intervals. Moreover, the above-mentioned correction can be performed simply by providing a setting device 10 that satisfies the necessary minimum amount of setting data determined by the correction width and the correction stage. Next, an embodiment of the present invention will be described with reference to FIGS. 3 and 4. In the figure, 19 is a pulse modulation device, 20 is operated by power input A, and when input B becomes "H", the content is added by 1, and when input C becomes "H", it is subtracted by 1, and the input This is a reversible counter whose contents are reset to zero when R becomes "H", and constitutes a setting device corresponding to setting device 10 in FIG. 21 is an initial reset signal generator when the power is turned on, 22 is a reset disable switch, 23 is an AND gate, 24
is a zero detector whose output 24a becomes "H" when the input becomes zero, 25 is an uninterruptible power supply that supplies power to the reversible counters 20 and 16, and 26 becomes "H" when car 1 reaches the top floor. 27 is the lowest floor signal which also becomes "H" when reaching the lowest floor, 28 is the lowest floor signal from the reference position (usually located below the lowest floor) to the lowest and top floors. The lowest floor position data and the highest floor position data in which the distance is expressed by the number of pulses 9a are stored, and when input A becomes "H", the highest floor position data is stored, and when input B becomes "H", the highest floor position data is stored. The uppermost and lowermost floor position storage device 29 that constitutes the absolute position detector that outputs the lower floor position data compares input A and input B, and when A>B, the output 29a becomes "H", and A<B. When , the output 29b becomes "H",
A comparator whose outputs 29a and 29b are both "L" when A=B, 30 a correction control circuit whose details are shown in FIG. 4, 30a the output of which is an addition signal, 30b a subtraction signal, and 30c a correction control circuit. direction command signal,
31 is an OR gate, 32 is an AND gate, 40 to 5
0 is an AND gate, 51 to 54 are OR gates, 5
5 and 56 are NOT gates, and 57 is an R-S flip-flop (hereinafter referred to as memory). Next, the operation of this embodiment will be explained. When the reset invalidation switch 22 is open, its output is "H". When the normal power is turned on at this time, the output of the initial reset signal generator 21 becomes "H", the output of the AND gate 23 becomes "H", and the contents of the reversible counter 20 are reset to zero. After that, the switch 22 is closed, but
Since one pole of the switch 22 is grounded, its output becomes "L", and the output of the AND gate 23 becomes "L", and the reversible counter 20 is no longer reset. This switch 22 prevents the pulse correction operation from being started in a state where the initial modulation factor is abnormally large. Now, since the output of the reversible counter 20 has become zero, the output 24a of the zero detector 24 becomes "H".
Furthermore, since the modulation rate input A to the modulator 17 is zero, no correction operation is performed on the pulse 9a, and even if the car 1 starts moving, the pulse 9a passes through the pulse corrector 15 and is directly input to the reversible counter 16. It is counted. Next, when the car 1 travels to the top floor, the top floor signal 26 becomes "H" and the top and bottom floor position storage device 28 outputs the top floor position data. The comparator 29 receives the car position signal 16a of the reversible counter 16.
and the above top floor position data. At this time, if the car position signal 16a is greater than the top floor position data, the output 29a of the comparator 29 becomes "H". This means that more pulses 9a were emitted than a predetermined number of pulses, and that negative pulse correction is required. Conversely, the output 29b of the comparator 29
becomes "H" means that the car position signal 16a is smaller than the top floor position data and positive pulse correction is required. In general, the sheave 4, governor wheel 8, main rope 3, and governor rope 6 wear out over time, and the main rope 3 and governor rope 6 often stretch due to their own weight.
The distance per pulse tends to become smaller, and the number of generated pulses in a given distance travel tends to increase. Now, when the car 1 stops at the top floor or the bottom floor, the top floor signal 26 and the bottom floor signal 27 cause
If the top floor position data or bottom floor position data stored in the storage device 28 is input to the data load input of the reversible counter 16 through the AND gate 32, the car position signal 16a is corrected to the top floor or bottom floor position. can. At this time, when the pulse correction is not performed, that is, the modulation rate is zero, and the output of the zero detector 24 is "H", when the car 1 reaches the top floor or the bottom floor, it is stored as the car position signal 16a. Device 2
Based on the difference between the outputs of the pulses 8 and 8, the direction in which the pulse 9a should be corrected, that is, the negative correction or the positive correction, is determined under the following conditions. Minus correction = (24a)・(26)・(29a)+(24a)
・
(27)・(29b) Plus correction = (24a)・(26)・(29b)+(24a)・
(27)・(29a) Also, if the direction of correction has already been determined,
It is necessary to change the modulation rate, which is the output of the reversible counter 20, according to the outputs 29a and 29b of the comparator 29, and the conditions for emitting the addition signal 30a when the modulation rate is increased, that is, the subtraction signal 30b when decreasing it. is determined as follows. Conditions for emitting addition signal (30a) = (30c)・(26)・(29a)+(30)・(26)・(29b)+(30)・(27)・
(29a) + (30c)・(27)・(29b) Condition for emitting subtraction signal (30b) = (30)・
(26)・(29a)+(30c)・(26)・(29b)+(30c)
・
(27)・(29a)+(30)・(27)・(29b) However, 30c is a minus correction command, and 30 is a state in which the minus correction command 30c is not output, that is, a plus correction command. Now, assume that the output of the reversible counter 20 is zero, that is, the output 24a of the zero detector 24 is "H", and the car 1 stops at the top floor, and the output 29a of the comparator 29 becomes "H". . Now AND gate 40
The output of the AND gate 44 becomes "H", and the output of the OR gate 51 also becomes "H", so the output of the AND gate 44 also becomes "H". The memory 57 is now set and its output Q becomes "H". That is, a negative correction command signal 30c is issued. at the same time,
The output of the AND gate 46 becomes "H", and the output of the OR gate 53, that is, the addition signal 30a becomes "H". As a result, the reversible counter 20 adds,
An output with a modulation rate of 1 is generated, and in the subsequent operation, the pulse processing device 12 performs a minus correction operation with a modulation rate of 1. Furthermore, when the addition signal 30a becomes "H", the output of the OR gate 31 also becomes "H", and the AND
Gate 32 is opened. Now, the top floor position data of the storage device 28 becomes the data load input of the reversible counter 16, the car position signal 16a becomes equal to the top floor position data, and as a result, both outputs 29a and 29b of the comparator 29 are "L". becomes. and
The outputs of the AND gates 40, 41, the OR gate 51, the AND gates 44, 46, and the OR gate 53 all become "L", and the addition signal 30a becomes "L". Next, when the car 1 moves downward and reaches the bottom floor, if the output 29b of the comparator 29 becomes "H", this will occur while the car 1 is running between the top floor and the bottom floor. Since the number of pulses 9a generated was greater than the predetermined value, it means that the negative pulse correction was insufficient. In this case, the outputs of the AND gate 41 and OR gate 51 are both "H".
becomes. On the other hand, since the output Q of the memory 57 holds "H", the outputs of the AND gate 46 and the OR gate 53 become "H", and the addition signal 30a becomes "H" again. The modulation factor increases to 2. In this way, each time car 1 stops at the top or bottom floor, the modulation rate is automatically switched, and the output 2
This continues until outputs 9a and 29b both become "L", or until output 29b on the top floor becomes "H" and output 29a on the bottom floor becomes "H". Output 29 on the top floor
When b becomes "H", that is, when the car position signal 16a becomes smaller than the top floor position data, the negative correction has been made too much. At this time, the output of the AND gate 43 becomes "H", and the OR
The output of the gate 52 also becomes "H". However, since the output 24a of the zero detector 24 is "L", the output of the AND gate 45 is "L", the memory 57 is not reset, and the direction of correction remains negative. However, the output of the AND gate 48 becomes "H", and the output of the OR gate 54 also becomes "H". At this time, since the output of the NOT gate 56 is "H", the subtraction signal 30b, which is the output of the AND gate 50, becomes "H". Now, the contents of the reversible counter 20 are subtracted, and the modulation rate is reduced by 1. In this way, the correct modulation factor will always be selected for each stop at the top and bottom floors. Next, a case where correction in the positive direction becomes necessary will be explained. When the reversible counter 20 sequentially subtracts and its output becomes zero, when it stops at the top floor, the output 29
b becomes "H", and the outputs of the AND gate 43 and OR gate 52 become "H". Or, when it stops at the bottom floor, output 29a becomes "H",
The outputs of the AND gate 42 and the OR gate 52 become "H". At this time, since the output 24a is "H", the output of the AND gate 45 becomes "H", the memory 57 is reset, and the output Q becomes "L". That is, a positive correction direction command signal 30c is issued. At the same time, the output of the NOT gate 55 becomes "H", so the output of the AND gate 47 becomes "H", and the addition signal 30a, which is the output of the OR gate 53, becomes "H". This increases the modulation factor and begins correction in the positive direction. This operation is similar to the correction in the negative direction, and the addition operation of the reversible counter 20 continues until an appropriate modulation rate is selected, and until the outputs 29a and 29b both become "L" and there is no need for correction, Alternatively, the correction is continued until the output 29a becomes "H" on the top floor or the output 29b becomes "H" on the bottom floor, that is, the positive correction becomes too much. Note that the reversible counters 16 and 20 of this embodiment are supplied with an uninterruptible power supply 25, which allows the car position signal 16a of the reversible counter 16 to be maintained during a power outage of the normal power supply, and to perform appropriate correction. The modulation factor for this is stored in the reversible counter 20, so that normal operation can be resumed immediately when the power outage is restored. Car positioning of the reversible counter 16 at the time of elevator installation is performed as follows. That is, when the car 1 is stopped at the top floor or the bottom floor and the power is turned on, the top floor or bottom floor position data output from the storage device 28 and the car position signal 16a are
If there is a difference, the addition signal 30a or the subtraction signal 30
b is output. As a result, the top floor position data or bottom floor position data indicating the actual car position is
The reversible counter 16 is loaded and the contents of the reversible counter 16 are automatically corrected to the actual car position. Further, the comparator 29 detects the magnitude of the car position signal 16a and the top floor or bottom floor position data output from the storage device 28, and the modulation rate output that determines the pulse correction rate of the reversible counter 20 is appropriate. Move forward or backward in value. However, if a predetermined distance is set in advance and the difference between the car position 16a and the output of the storage device 28 exceeds this predetermined distance, the outputs 29a and 29b, which are size discrimination signals, are generated. The modulation rate output of the counter 20 stabilizes at an appropriate value. Note that the top floor signal 26 and the bottom floor signal 27 are as follows:
The signal is generated by the engagement between a switch installed in the hoistway and a cam installed in the car 1, and the pulse is corrected by this. However, it is possible to emit a signal to detect the absolute position of car 1 on other floors, or to emit a signal to detect the absolute position of car 1 at any position other than the floor or even when the car is running. Then, pulse correction may be performed. Also, outside of the engagement of the switch and the cam,
Detection may also be performed by optical or electrical engagement. As explained above, in the present invention, when a car reaches two positions (for example, the top floor and the bottom floor) provided at a predetermined distance apart in a hoistway, the amount of movement of the car at that position is measured. The value of the car position based on the number of pulses calculated is compared with the absolute value of that position, and according to the comparison result, the modulation rate of the modulator is automatically adjusted to correct the number of pulses counted by the counter. When changing the modulation rate and changing the modulation rate, set the absolute value to the counter, and set the modulation rate change setting operation and the absolute value setting to the counter. This is executed every time the car reaches two positions (absolute positions). Thereby, it is possible to accurately and automatically correct pulse changes due to mechanical wear and manufacturing errors without using multiple arithmetic processes, and it is possible to always accurately detect the position of the elevator. In addition, the setting device that sets the modulation factor and the counter that counts pulses are supplied with power from an uninterruptible power supply, so the modulation factor is always stored and stored for proper correction, and the counter is used for counting pulses. It is possible to memorize and retain the counted values of the device, and even if a power outage accident occurs, normal operation can be resumed immediately after the power outage is restored.

[Brief explanation of the drawing]

FIG. 1 is a block circuit diagram showing a conventional elevator position detection device, and FIG. 2 is a block circuit diagram showing an embodiment of the elevator position detection device according to the present invention. 3 and 4 are diagrams showing other embodiments of the present invention, and FIG.
This figure is a block diagram corresponding to FIG. 1 (parts omitted), and FIG. 4 is a logic circuit diagram showing the correction control circuit of FIG. 3. 1... Elevator car, 6... Governor rope, 8... Governor car, 9... Pulse generator, 12
... Pulse processing device, 15 ... Pulse corrector, 1
6... Reversible counter, 16a... Car position signal, 1
7... Frequency modulator, 18... Counter, 20...
Setting device (reversible counter), 25...Uninterruptible power supply, 2
8...Absolute position detector (uppermost and lowermost floor position storage device), 29...Comparator, 30...Correction control circuit Note that the same parts in the drawings are indicated by the same reference numerals.

Claims (1)

[Claims] 1 a. A pulse generator that generates a pulse according to the amount of movement of the car; b. A modulator that modulates the frequency of the pulse according to a set modulation rate; c. Based on the output of this modulator. d a counter that counts the pulses corrected by the pulse corrector and outputs a car position signal corresponding to the position of the car; e when the car is raised or lowered; A first hoistway is provided at two positions separated by a predetermined distance and emits a signal when the car reaches those two positions.
and a second absolute position detector; a storage device; g a comparator that inputs the output of the counter and the output of the storage device and compares both outputs; Correction control that inputs the comparison result of the comparator, determines whether the pulse corrector should increase or decrease the number of pulses according to the comparison result, and outputs a command signal. a circuit; i responsive to said command signal representing said increase or decrease correction of said correction control circuit, generating a signal for changing the modulation rate of said modulator each time said command signal is issued; a setting device that outputs the signal to the modulator; An elevator position detection device comprising: absolute value setting means for setting an absolute value in the counter; 2 a. A pulse generator that generates pulses according to the amount of movement of the car; b. A modulator that modulates the frequency of the pulses according to a set modulation rate; c. The number of generated pulses based on the output of this modulator. d a counter that counts the pulses corrected by the pulse corrector and outputs a car position signal corresponding to the position of the car; a first one located at two locations separated by a distance and emitting a signal when the car reaches those two locations;
and a second absolute position detector; a storage device; g a comparator that inputs the output of the counter and the output of the storage device and compares both outputs; Correction control that inputs the comparison result of the comparator, determines whether the pulse corrector should increase or decrease the number of pulses according to the comparison result, and outputs a command signal. a circuit; i responsive to said command signal representing said increase or decrease correction of said correction control circuit, generating a signal for changing the modulation rate of said modulator each time said command signal is issued; a setting device that outputs the signal to the modulator; Absolute value setting means for setting an absolute value in the counter; An elevator position sensing device comprising: an uninterruptible power source for maintaining the and in operating condition;