JPH04173675A - Control device of fluid pressure elevator - Google Patents

Abstract

PURPOSE:To control the floor reaching speed without an extensive speed variation even though a shaking is given to a cage, by providing a means to measure the passing time from a speed reduction control starting time, and a circuit means to set the time to convert to a floor reaching running by using the passing time and the detected speed of a cage, to a speed reduction control circuit. CONSTITUTION:A speed detecting circuit 110 to detect the speed of a cage is provided, and a speed reduction control circuit 1 to start a speed reduction control when the cage reaches a specific position, and to control to stop to a specific floor position after transferring to a floor reaching running by a running condition instruction circuit 180 is also provided. To this speed reduction control circuit 1, a means 120 to measure the passing time from the speed reduction control starting time, and a circuit means 141 to set the time to transfer to the floor reaching running by using the passage time and the detected speed from the speed detecting circuit 110 are provided. And when both the passing time and the speed of the cage are decided to be in the preset condition, a control to transfer to the floor reaching running is carried out. Consequently, even though the speed of the cage is changed by receiving a shaking by a passenger, the floor reaching running speed is not changed too much.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a control device for a fluid pressure elevator such as a hydraulic elevator, and particularly to a fluid pressure elevator that performs speed control using a valve that electrically controls flow rate. The present invention relates to a control device suitable for.

[Conventional technology]

This type of fluid pressure elevator controls the speed of the car through a main control valve that controls the flow rate of pressure fluid supplied to or discharged from the cylinder, and a pilot valve that controls the degree of opening and closing of this main control valve. However, a large number of throttle resistors were installed in the pilot circuit that controlled the main control valve, and the pilot valve was turned on and off according to a preset sequence, and the speed was controlled sequentially using fluid pressure. Japanese Patent Laid-Open No. 15379/1984 has been proposed as a conventional technique for implementing automatic speed control of this type of hydraulic elevator. Further, an example of a fluid pressure elevator control device that controls acceleration/deceleration by moving a pilot valve in a nearly continuous manner by controlling the pilot valve at high speed using a high-frequency electric signal is disclosed in Japanese Patent Application Laid-Open No. 60-213680.

[Problems to be Solved by the Invention] The speed of a car in a hydraulic elevator is susceptible to vibrations caused by mischief or the like by passengers in the car. For this reason, if the speed of the car is detected to control the transition to floor landing, etc., the influence of vibration may cause an increase in the landing speed or stall, reducing the landing accuracy and causing a relapse. There were problems such as the need to start up the system in some cases.

The purpose of the present invention is to solve the above-mentioned problems in the prior art,
To provide a fluid pressure elevator control device having a configuration capable of controlling landing speed without significant fluctuation even when a passenger vibrates the car.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a speed detection circuit that detects the speed of a car, and a speed detection circuit that starts deceleration control when the car reaches a predetermined position, and then shifts to floor landing travel and then performs a predetermined speed detection circuit. The deceleration control circuit includes a deceleration control circuit that controls the vehicle to stop at the floor position, and the deceleration control circuit includes a means for measuring the elapsed time from the start of the deceleration control, and a means for measuring the elapsed time when the elapsed time is within a set time width. When the detected car speed drops to a predetermined value, the car is shifted to floor landing running, and if the elapsed time is before the beginning of the above time range, the shift is not made to floor landing running even if the detected speed is less than the predetermined value, After the width has elapsed, circuit means is provided for controlling the vehicle to forcibly shift to floor landing travel even if the detected speed exceeds a predetermined value.

[Effect]

The speed detection circuit detects the speed of the car.

Deliver to deceleration control circuit. The deceleration control circuit measures the elapsed time from the time when the deceleration start command was issued, and uses this elapsed time and
When it is determined that both the car speed and the car speed meet preset conditions, control is performed to change the pulse signal output to the solenoid coil of the main control valve pilot circuit to shift to floor landing travel. As a result, even if the speed of the car changes due to vibrations caused by passengers inside the car, the landing speed will not change significantly, and problems such as reduced landing accuracy and stalling will not occur. There is no.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. Second
The figure shows the overall configuration of an embodiment of the present invention, which has the following configuration. Arithmetic processing and various signal interfaces and pulse width control circuits PWDI, PWD2.
It is equipped with a liquid pressure elevator control device 1 equipped with a PWUI, a PWU 2, etc., a pump 5 that serves as a liquid pressure source during upward operation, a motor 4 that drives this pump 5, and a tank 6 that stores liquid. The rising main valve U is controlled by the pulse width control circuit PWUI.
Solenoid coil C of pilot valve PUI that closes V
When the UI is activated, the following operation occurs. A portion of the liquid that had all returned to tank 6 through the route of pump 5 → check valve (choke) CHV → main rising valve UV → tank 6 is now flowing back to main rising valve T.
By closing the JV, the fluid is injected into the cylinder 10 via the main descending valve DV, and the plunger 7 floats up. Due to the levitation of the Buranjawa, the car 14, which is indirectly connected to the pulley 12 through the rope 13, is fixed to the rail 17 and moves upward. A hydraulic elevator in which a car is mounted on the top of the hydraulic jack and is directly driven can also be controlled in the same way.

Now, during ascending operation, the pulse width control circuit PWUI
, the output pulse width of PWU2 is θPWI, θP, respectively.
If expressed as W2, as shown in FIG. 3, the pulse width θP
When the pulse width θPW1 is increased while W2 is increased, the main ascending valve UV begins to close, and the steering wheel 14 accelerates. When the pulse width θPWI is constant, the rising main valve UV
The circuit closes at a constant speed, and the speed of the carriage 14 increases at a constant acceleration. When the pulse width θPWI becomes zero, the degree of closure of the main lift valve UV becomes constant, and the passenger seat 14 travels at a constant speed.

The control device 1 receives a signal from a hall button 18 installed at the first landing, a signal from a destination floor button 16 in the car 14, a detection signal from a speed detector 15 that detects the speed of the second car 14, etc. is taken in to perform deceleration control. When the deceleration start command is issued at time 0, the pulse width θPWI remains at zero and the pulse width θPW2 is decreased. As a result, the main lift valve UV begins to open, the liquid supplied from the pump 5 begins to return to the tank 6, and the car 14 begins to decelerate. When the pulse width θPW2 is kept constant at a small value, the main lift valve UV opens at a constant speed, and the car 14 decelerates at a constant deceleration. If the pulse width θPW2 is increased at the time 0 when the speed V of the car 14 becomes vl, the main lift valve U
The opening/closing degree of V is constant, and the car 14 is at a constant speed VL.
, perform the landing run. Next, when the vehicle approaches the landing level at about the same time, the car 14 is stopped by decreasing the total pulse width θPW2 and using the main ascending valve UV as a customs duty. Furthermore, after the ride and 14 have stopped, the pulse width θPW
Set 2 to zero and complete the series of operations. The reason why the pulse width θPW2 is set to zero is to stop unnecessary excitation of the solenoid coil CU2 and thereby extend its life.

In the case of descending travel, the car 14 descends by its own weight, so the only difference is that there is no need to drive the pump 5. That is, in the same way as during upward travel, the opening degree of the main descending valve DV is changed using the pulse widths θPWI and θPW2, and the amount of liquid returned from the plunger 10 to the tank 6 is controlled to perform the downward travel.

Next, the deceleration control operation according to this embodiment will be explained in more detail using the block diagram shown in FIG. The speed detection circuit 110 receives a signal S15 from a speed detector 15 (rotary encoder in the embodiment) installed in the car 14, and converts it into a digital signal V, which is, for example, signed speed data. Car position creation circuit 12
0 is.

A car position signal PS14 indicating the distance from the reference position by integrating this speed data V and an elevator operation control floor signal F
Output N. In addition, the car position signal PS14 is determined by the value of each floor level position data table based on the signal S20 from the end floor deceleration position detectors 20U and 20D and the signal S21 from each floor door opening zone detector 21A, 21B, and 21C. Find the correct position data based on this and rewrite it to this. The position detection circuit 130 calculates the difference between the car position signal PS14 and the level position data table of the next floor to stop, calculates the remaining travel distance, detects that this value has become less than a predetermined value, and detects the deceleration position. It outputs a signal SD, a landing stop position signal SP, a door opening permission zone signal DZ, etc. Pulse width θ
The speed control constants such as and the control time t are determined by the speed control circuit 1.
41, and the J signal output from the driving condition command circuit 180 (for example, "00" for a stop command, "'01" for an UP command, and "10" for a DOWN command) and the speed from the speed detection circuit 110. A value adapted to the data V is obtained by searching or calculating based on a stored data group and is output. The pulse width output circuit 146 has a pulse width θPWI based on t and θ and the upward running command Sll from the operation control circuit 200.

A pulse of θPW2 is output to the solenoid drive circuit 400, and the solenoid coil C1J1. The operation control circuit 200, which excites Cu2 and controls the main ascending valve UV, receives signals from the destination floor button 16 in the car 14 and the hall button 18 installed at the landing, and performs the above-mentioned ascending operation. Directive S
It outputs the ll and descending travel commands. The main circuit control circuit 500 is a command signal generator 4 that drives the drive motor 4 based on the upward running command Sll from the operation control circuit 200.
Output.

Next, the difference in control operation between the case where the present invention is applied and the case where the present invention is not applied will be explained with reference to FIGS. 4 to 6. First, FIGS. 4 and 5 show velocity curves (solid lines) when the car is vibrated without applying the present invention. The curve shown by the broken line is the one under normal conditions without excitation. In other words, as shown in Figure 4, by excitation, ■
When the speed drops below V□ at the time of the sword, the floor landing traveling speed becomes VL2, which is significantly faster than the normal floor landing traveling speed VL1, and therefore the landing accuracy decreases. Conversely, as shown in Fig. 5, the velocity V at a slow point Ω due to vibration.

Below this, the landing speed becomes VL3, which is significantly lower than the normal flooring speed vL1, and in the worst case, the vehicle stalls.

FIG. 6 is an explanatory diagram when the present invention is applied.

If the elapsed time from the start of deceleration control is less than or equal to t, even if the speed becomes less than or equal to V, it is determined that this is due to vibration, and this is invalidated, and the vehicle does not proceed to floor landing travel. - If the speed becomes less than or equal to v1 during the elapsed time from the time t to t, it is a normal speed, and the vehicle shifts to floor landing running from the time vl is detected. If the speed does not become less than v1 even after the elapsed time is t2 or more, it is determined that this is also due to vibration, and the car is forced to move to floor landing.8 By using this control method, the car Even if it were to be vibrated, it would only change the speed increase corresponding to the time width 12-11, and compared to the case where the speed simply shifts to floor landing under the condition that the speed is less than v1, the landing The control accuracy of bed speed is greatly improved.

In addition, in the above explanation, the elapsed times t1 and t2 are as follows:
It is desirable to make it variable according to the temperature and pressure of the liquid used in the liquid pressure elevator. The reason is that the deceleration of a hydraulic elevator car generally depends on the temperature of the liquid used.
This is because it changes significantly depending on the pressure. For this reason, depending on the temperature and pressure of the liquid, 1. ．． 1. By making variable, even more precise control becomes possible. This value of t1+t2 may be set initially, or may be set by learning the results of driving several times. Furthermore, since there is a correlation between deceleration and acceleration, the relationship between acceleration and deceleration time may be learned and set without directly measuring the temperature or pressure of the liquid.

〔Effect of the invention〕

According to the present invention, even if the car of a hydraulic elevator is shaken by a passenger's mischief, etc., it is possible to prevent inconveniences such as a significant increase in landing speed or stalling and requiring restart. There is.

Further, according to the configuration of claim 3 or 4, in which the set value of the elapsed time tip2 is made variable according to the temperature and pressure of the liquid used, in addition to the above-mentioned effects, the accuracy of deceleration control at the time of landing is further improved. can be improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a control device showing an embodiment of the present invention, FIG. 2 is an overall configuration diagram of a fluid pressure elevator, and FIGS. 3 and 6 are time charts explaining the operation of the embodiment of the present invention. FIGS. 4 and 5 are control time charts when the present invention is not applied. DESCRIPTION OF SYMBOLS 1... Control device (deceleration control circuit), 110... Speed detection circuit, 141... Speed control circuit, 146... Pulse width output circuit, PWDI, PWD2. PWUI. PV/U 2...Pulse width control circuit, CDI, CD2
゜CUI, Cu2... Solenoid coil, DV...
Descending agent Patent attorney Katsuo Ogawa ゝ1 Management, ・＼-/ Certain 3121 sot stt βPI 5D+ 5L2SLt 5Pz SD I SL+ SL55P3

Claims (1)

[Claims] 1. Speed control of a car connected directly or indirectly to a fluid pressure cylinder, including a main control valve that controls the flow rate of pressure fluid supplied to or discharged from the cylinder, and the degree of opening/closing of this main control valve. In a hydraulic elevator, a speed detection circuit detects the speed of the car through a pilot valve that controls the car, and a speed detection circuit that starts deceleration control when the car reaches a predetermined position. The deceleration control circuit includes a deceleration control circuit that performs control to stop the floor at a predetermined floor position, and the deceleration control circuit measures the elapsed time from the start of the deceleration control, and compares this elapsed time with the detected speed from the speed detection circuit. 1. A control device for a fluid pressure elevator, comprising circuit means for setting a point in time when the elevator moves to a floor. 2. The deceleration control circuit according to claim 1 causes the transition to landing driving at the time when the detected speed drops to a predetermined value when the elapsed time is within a predetermined time range, and before that, the detected speed The fluid pressure is characterized by having a circuit means for performing control such that the vehicle does not shift to floor landing traveling even if the detected speed is less than a predetermined value, and forcibly shifts to floor landing traveling even if the detected speed exceeds the predetermined value after the elapse of the above-mentioned time range. Elevator control device. 3. A control device for a fluid pressure elevator, characterized in that the start and end points of the time span according to claim 2 are variably set according to the value of at least one of the pressure and temperature of the fluid. 4. Setting the start and end points of the time span according to claim 2 while correcting them by learning control using at least one value of fluid pressure, fluid temperature, and acceleration during car raising operation. A control device for a fluid pressure elevator, characterized in that: