JPS641390B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a fluid system that supplies pressure fluid to a fluid pressure ram or discharges pressure fluid from a fluid pressure ram to move a car up and down via a plunger. Regarding pressure elevators.

[Prior art] Conventionally, this type of fluid pressure elevator was disclosed in Japanese Patent Application Laid-Open No.
As described in Publication No. 203074, the optimal deceleration delay time is determined by detecting the load or oil temperature of the hydraulic system and estimating the landing time during which the car travels at a low landing speed. It was controlling the deceleration of the car.

[Problem to be solved by the invention]

In the above conventional technology, necessary information such as full speed, landing speed, deceleration time, etc. is estimated from the oil temperature or load of the hydraulic system using a predetermined calculation formula, so it is difficult to estimate the flow rate control valve variation and fluid pressure. Due to differences in elevator models, it was difficult to obtain an optimal deceleration start delay time, resulting in low control accuracy.
In order to find the optimal deceleration start delay time, it was necessary to clarify the characteristics of each hydraulic elevator model and each flow control valve.

An object of the present invention is to provide a fluid pressure elevator with good riding comfort and low energy loss without having to know the details of the control characteristics of the flow control valve in advance.

[Means to solve the problem]

The above object is achieved by the configuration set forth in claim 1.

[Effect]

In the present invention, a hydraulic elevator is actually operated,
The speed or displacement (position) at that time is detected to obtain information (full speed, landing speed, landing travel time, etc.) for calculating the deceleration start delay time, and based on this information, the hydraulic elevator Find the deceleration start delay time when driving. Therefore, even if there are differences in fluid pressure elevator models or variations in flow rate control valves, the control characteristics of the fluid pressure system including these are detected, so the optimal deceleration start delay time can always be found. The obtained value is used to operate the fluid pressure elevator, so it can be controlled with high precision. As a result, the operating time of the hydraulic elevator can be minimized with the minimum number of operations, and a hydraulic elevator with good riding comfort and low energy loss can be realized.

〔Example〕

An embodiment of the present invention will be described below based on the drawings.

FIG. 1 is a diagram showing the overall configuration of a fluid pressure elevator.

Although FIG. 1 shows an indirect type in which the car 1 is driven via a pulley 3, a rope 4, and a spring 5 provided at the top of the plunger 2a of the fluid pressure ram 2, the plunger 2a directly drives the car 1. It can also be applied to the format of Flow control valve 6 controls fluid flow between fluid pressure source 7 and fluid pressure ram 2 .

12 is a detector for detecting the displacement or speed of the car 1, such as an encoder or a generator;
In the embodiment, a method is shown in which this detector 12 is connected to the car 1 via the rope 11 and pulleys 10a, 10b as shown in FIG. A method of detecting the movement relative to the rail, or a method of indirectly detecting the movement of the car 1 by the movement of the plunger 2a using a framework of the pulley 3 or the like may be used.

The control unit 13 receives signals from the switches 9 in the car 1 and the switches 8 in the tower, and drives the flow rate control valve 6 and the fluid pressure generator 7 based on this signal and the necessary information signal obtained from the calculation unit 14. do. Further, a signal from the displacement or speed detector 12 of the car 1 is sent to the calculation section 14 via the conversion section 15, and the storage section 16 temporarily stores information necessary for the calculation.

Next, the operation of the hydraulic elevator of the present invention will be explained.

The control unit 13 drives the pump of the fluid pressure source 7 (only when the elevator is ascending) in response to the activation signal, and also controls the flow rate control valve 6 to increase the flow rate of the pressure fluid supplied to and discharged from the fluid pressure ram 2. Therefore, as shown in FIG. 2, the speed of the car 1 increases to a constant speed of _Vt . In addition, after the car 1 is running, a deceleration start signal is sent from the switch 8 in the tower or the detector 12
If the pressure fluid supplied to and discharged from the fluid pressure ram 2 is reduced using the deceleration start position signal obtained from the signal _from (implantation speed). Furthermore, if the flow rate of the pressure fluid is made zero with a stop signal, the car 1 is stopped. The fluid control valve 6 is controlled based on commands from the control section 13. Regarding this speed characteristic, as shown by the solid line, it is better for the time t _L for traveling at V _L to be as short as possible.

By the way, when fluid temperature or load pressure changes,
V _T , V _L , and acceleration/deceleration characteristics change, and the time it takes to travel at V _L increases to t _L *, as shown by the broken line in FIG.
This is a problem in the following points.

First, passengers feel frustrated because even though they think the elevator has stopped at point B, the doors do not open until they reach point C. Also, if the elevator is going up,
The bleed-off flow rate increases, the amount of heat generated increases, and the rise in fluid temperature increases. Furthermore, energy consumption increases.

In the present invention, to solve the above problem, the deceleration start point A is delayed by Δt time to become A', and the speed characteristic of A-B-C is changed to A'-B'-C' to shorten the time _tL . . This Δt is determined as follows. The fluid pressure elevator is operated, and the operating state at this time is input to the calculation section 14 via the conversion section 15 as a signal from the detector 12. and the speeds V _T , V _L and B
Find the distance _XL between -C. When using a displacement detector as the detector 12, these values are determined by differentiating the displacement to determine the velocity. Also,
When using a speed detector, find the displacement X _L by integrating the speed, or find it from X _L = V _L · t _L *. Further, as long as the detector 12 can detect displacement and velocity, it can be used directly. These _VT , _VL , _XL , etc. are stored in the storage section. Next time, when operating the hydraulic elevator under similar operating conditions, V _T is detected in the same manner as described above, and at the same time, V _L ,
Using x _L , Δt is determined by Δt=(X _L −V _L t _L )/V _T (1). In equation (1), t _L is the target time for traveling at V _L. When calculating Δt using the above formula (1),
Since V _L and X _L use the detected values from the last time the vehicle was driven under conditions similar to the current driving conditions, all of the information used to determine Δt does not reflect the current driving state. In other words, necessary information such as V _L as a result of one trip is temporarily stored in the storage unit 16, and the next time the vehicle is traveling under the same conditions, the previous information is retrieved, Δt is determined, and the deceleration starting point of the elevator is determined. A
to A′. When detecting velocity and displacement, find the values.

By delaying the deceleration start time by the Δt time determined in this manner, the travel time at low speed can be significantly shortened as described above. In this case, since the actual running speed and displacement (position) of the elevator car are detected and Δt is determined based on these, it is possible to determine Δt without knowing the characteristics of the flow control valve in detail. Moreover, as a result, riding comfort can be improved and energy loss can also be reduced.

Next, another embodiment of the present invention is shown in FIGS. 3 and 4. 3 and 4, the same reference numerals as in FIGS. 1 and 2 indicate the same parts.
Since the temperature range or pressure (load) range in which the elevator is used is wide, it should be considered that the load conditions change each time the elevator is operated.
Therefore, Δt also changes with each drive.

In the present invention, the region of fluid temperature and load pressure (load load) is divided into small regions, and necessary information is stored for each small region. FIG. 3 shows an example of region division when both temperature and pressure are used. If the influence of either temperature or pressure is small, this region may be performed using only one of them.

As shown in FIG. 4, fluid temperature and load pressure are detected by a fluid temperature detector 17 and a load pressure detector 18, and these detected values are used when operating the elevator.

That is, a small area to be operated based on these detected values can be specified. The calculation unit 14 extracts the necessary information from the corresponding small area of the storage unit 16 and calculates Δt.
It is supplied to the control section 13. The control unit 13 uses this Δt to delay the deceleration start time and performs the control described above. The storage unit 16 temporarily stores information on each small area, and outputs and updates the information according to instructions from the calculation unit 14. As a result, although the load conditions under which the elevator is operated are wide, the range for actually calculating Δt becomes narrower, and the accuracy of calculating Δt is greatly improved.

In FIG. 2, points A and C are position commands (generated by a switch in the tower, etc.). During the second operation in the same small area, Δt is determined by (1) and controlled accordingly, resulting in A'-B'-C'. At this time, there is a possibility that t _L deviates from the target value t. In that case, the information from the second operation is used to correct Δt during the third operation. In other words, Δt ⁽ⁿ⁾ = Δt _(o-1) + α (x _L ^(n-1) −V _L ^(n-1) t _L )/v _T ⁽ⁿ⁾ …(2) for the nth operation. The delay time Δt ^{( n)} _at the time is the previous time _{Δt (o-1)} ^{, the} previous _time
Determine by ⁿ⁾ . Here, α≦1 and for safety's sake, avoid making major corrections at once. By doing this, t _L approaches the target value t _L one after another. Further, by storing Δt ^(n-1) and α(x _L ^(n-1) −v _L ^(n-1) t _L ) in the storage unit 16, its capacity can be reduced.

If the elevator is controlled using equation (2) in this way, all the information necessary to find Δt can be found through detection, so it is necessary to know the control characteristics of the flow control valve in advance. disappears. In addition, since we use the latest information on control characteristics,
Even if the driving characteristics change, it can be corrected immediately, and the correction accuracy is also high.

〔Effect of the invention〕

According to the present invention, without knowing the control characteristics of the flow control valve in advance, it is possible to achieve the shortest landing time while maintaining the landing accuracy of the car, improving riding comfort and reducing heat generation (energy This has the effect of reducing losses.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the control system in a fluid pressure elevator of the present invention, FIG. 2 is a characteristic diagram showing the speed characteristics of the fluid pressure elevator, and FIGS.
The figure shows another embodiment of the fluid pressure elevator of the present invention, FIG. 3 shows an example of dividing small areas when using both fluid temperature and pressure loads, and FIG. 4 shows a control system. . 1... Car, 6... Flow rate control valve, 8, 9, 1
2...Detector, 13...Control unit, 14...Calculation unit, 16...Storage unit.

Claims (1)

[Claims] 1 A fluid pressure elevator that controls the speed of the car by controlling the flow rate of pressure fluid supplied to or discharged from the fluid pressure ram, and when landing on the floor, decelerates from a predetermined deceleration start point and runs at a low landing speed. , storage means for storing a deceleration delay time for delaying the start of deceleration from the deceleration start point, means for detecting the speed or displacement of the car traveling at the landing speed, and the detected previous landing speed. Means for correcting the deceleration delay time so that the landing travel time approaches a target value based on the traveling speed, the flooring travel distance, the current full-speed traveling speed, and the deceleration delay time stored in the storage means; means for controlling the deceleration of the car by delaying the start of deceleration by the corrected deceleration delay time; and means for updating the deceleration delay time stored in the storage means to the corrected deceleration delay time. A fluid pressure elevator characterized by: