EP0227296A2 - Druckbezogene programmierte Durchflusssteuerung in einem hydraulischen Ventil - Google Patents

Druckbezogene programmierte Durchflusssteuerung in einem hydraulischen Ventil Download PDF

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Publication number
EP0227296A2
EP0227296A2 EP86308993A EP86308993A EP0227296A2 EP 0227296 A2 EP0227296 A2 EP 0227296A2 EP 86308993 A EP86308993 A EP 86308993A EP 86308993 A EP86308993 A EP 86308993A EP 0227296 A2 EP0227296 A2 EP 0227296A2
Authority
EP
European Patent Office
Prior art keywords
valve
flow
outlet
main
inlet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP86308993A
Other languages
English (en)
French (fr)
Other versions
EP0227296A3 (en
EP0227296B1 (de
Inventor
Giorgio Fossati
Giuseppe Manco
Harold Terry
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Atto Di Licenza otis SpA - Calzolari Ascensore
Original Assignee
Otis Elevator Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US06/853,284 external-priority patent/US4700748A/en
Priority claimed from US06/853,286 external-priority patent/US4674527A/en
Application filed by Otis Elevator Co filed Critical Otis Elevator Co
Publication of EP0227296A2 publication Critical patent/EP0227296A2/de
Publication of EP0227296A3 publication Critical patent/EP0227296A3/en
Application granted granted Critical
Publication of EP0227296B1 publication Critical patent/EP0227296B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B1/00—Control systems of elevators in general
    • B66B1/24—Control systems with regulation, i.e. with retroactive action, for influencing travelling speed, acceleration, or deceleration

Definitions

  • This invention concerns hydraulic valve control systems and is particularly, though not exclusively, useful in hydraulic elevators.
  • U.S. Patent 4,205,592 A technique illustrating feedback is shown in U.S. Patent 4,205,592, where the flow through the valve and to an object, such as a hydraulic elevator, is passed through a flow meter that includes a potentiometer. As the flow increases, the output voltage associated with the motion of the potentiometer wiper changes, manifesting the magnitude of the flow.
  • U.S. Patent 4,381,699 shows a similar type of valve control.
  • U.S. Patent 4,418,794 is illustrative of the type of valve that may be used in systems that do not sense the fluid flow but, using a larger feedback loop, perhaps sense the position of the elevator car and control the operation of the valve.
  • a linear flow control valve is operated by a stepper motor to control flow between the pump and the hydraulic cylinder when the object, e.g., elevator car, is raised and the return flow from the cylinder to the tank when the car is lowered.
  • the time- related motion of this valve mirrors the flow to the car, thus also the car's velocity profile.
  • the operation of the valve begins by placing it in a position at which the fluid from the pump is completely bypassed from the car. The valve is then progressively closed, decreasing that bypass flow. When the pressure applied to the elevator car exceeds the pressure required to sustain the car, motion of the valve is programmed to the desired elevator velocity profile.
  • the pressure differential that arises when the output pump pressure just exceeds the pressure required to hold the car in place is sensed from the motion of a check valve across which the pump pressure and car pressure are oppositely applied. Movement of the check valve to an open position at which the car will just about start to move is detected by an electrical switch that produces an electrical control signal that is applied to the main valve control. That control signal acts as the starting point for main valve programmed positioning that determines the velocity profile of the elevator car when the car is moved up.
  • connection between the motor and the valve is through a resilient coupling, such as a spring.
  • a resilient coupling such as a spring.
  • This connection allows the valve to be moved to bypass fluid flow from the pump back to the tank when the valve is in a position in which all the pump output is directed by the valve to the actuator.
  • a pressure release valve is operated when the pump pressure exceeds a certain level, and that operation applies fluid under pressure to the valve, which, in response, moves against the resilient coupling to connect the pump output to the tank. This valve operation relieves the pump pressure.
  • the drawing is a schematic view showing by way of example only a hydraulic elevator control system embodying the present invention.
  • Fig. 1 shows a hydraulic.elevator control system for moving an elevator car 10 between a plurality of floors or landings. The floors or landings are not shown.
  • the car is attached to a car piston (plunger) 11 that extends from a cylinder 12, and fluid is pumped into or discharged from the cylinder to raise and lower the car respectively, that flow being controlled and regulated in a manner that will be described in detail.
  • the motion of the car is detected by a pickup 13. Associated with a stationary position tape 14, the pickup provides a signal (POSITION) on line 15, that is supplied to a pump and valve control (PVC) 17.
  • PVC pump and valve control
  • the POSITION signal manifests the car position and velocity.
  • the position of the car thus sensed is used for controlling the flow of fluid to and from the cylinder, controlling the position of the car piston or plunger 11.
  • the PVC 17 controls a hydraulic valve system that includes a pump 21 and a fluid reservoir (tank) 5.
  • the pump supplies fluid to a hydraulic control valve assembly A through a check valve 6 (to prevent back flow), and this assembly is controlled, along with the pump, by the PVC 17.
  • the pump is turned on or off (activated/deactivated) by a pump on/off signal on a line 22, and the fluid from the pump is applied under pressure through the check valve 6 to a first port 25.
  • the port 25 leads to a "key-shaped" valve window 26 that is part of a linear valve 27, one that moves back and forth linearly between two positions Pl, P2.
  • the position of the valve 27 is controlled by a stepper motor 28 which receives a signal (SPEED) on the line 20 from the PVC 17. That signal comprises successive pulses, and the frequency of those pulses determines the motor's 28 speed; hence also the longitudinal (see arrow Al) rate of positioning of the valve 27.
  • SPEED signal
  • Each pulse in the SPEED signal represents an incremental distance along the length of motion of the valve 27 between points Pl and P2.
  • the position (location) of the valve is represented by the accumulated count between those positions.
  • the valve window 26 comprises a large window 26a and an adjacent narrower window 26b, giving it a "key-shaped" appearance.
  • the large window 26a is adjacent the first inlet port 25, and the narrower adjacent portion 26b is located next to a second port 31.
  • the valve 27 is "open”. That second port 31 leads to a line 32 that goes to the tank 5.
  • the small window 26b is mostly adjacent to the port 25, and the path to the port 31 is blocked by the solid part of the valve.
  • the valve 27 is "closed”.
  • the fluid then passes into the large window 26a and, from there, through the small window 26b back to the line 32, then to the tank.
  • the FU flow is thus bypassed when the pump is started.
  • valve 27 closes (moves to position Pl)
  • the pressure of the FU fluid flow begins to build in an internal port 35, while the bypass flow on line 32 decreases as the path through window 26b to port 31 decreases.
  • position Pl nonbypass position
  • the area of the smaller window 26b is more dependent than with the case of the larger window on the longitudinal position of the valve 27.
  • the change in flow is controlled by the smaller valve window area to outlet port 31, which reduces as the main valve begins to move towards the closed position at Pl, at which all the FU flow passes from the port 25 to the inlet 35; there being no path between the port 25 and the outlet port 31.
  • the fluid pressure PS1 in the internal port 35 is applied to a main check valve (MCV) 40.
  • MCV main check valve
  • This valve has a small stem 41 that rests in a guide 41a.
  • the MCV may freely move up and down in response to the pressure differentials between the port 35 and the port 43, where the pressures are PS1 and PS2, respectively.
  • the pump is turned on and the main valve 27 closes, moves towards position P1
  • the MCV 40 is pushed upward when PS1 exceeds PS2, allowing the FU flow to pass through the MCV into the line 42 that extends to the cylinder 12. This happens as the bypass flow decreases.
  • the resultant fluid flow displaces the car piston 11 upward, moving the car in the same direction.
  • This actuator includes a rod 50a, which contacts the stem 41 when pushed upward; a first member 50b which is pushed upward against the rod; a second member 50c which when pushed upward moves the first member.
  • the rod 50a is thrust upward, pushing the MCV 40 upward, when fluid, at pressure PS2, is applied to the inlet line 52, and that happens only when a LOWER signal is applied to the line 53 that goes to a solenoid control release valve 55.
  • the fluid pressure in the line 52 is then applied to the bottom of the members (pistons) 50b, 50c.
  • the combined surface area of those members is greater than the upper surface area 62 of the valve 40.
  • the second member moves until it strikes the wall 50d of the chamber 50e.
  • the first member also moves with the second member because of the flange 50f.
  • This small motion (as far as the wall 50d) "cracks" open the MCV 40, equalizing the pressures PS1 and PS2. Then the first member continues to move upward, until it too strikes the wall, fully opening the MCV 40.
  • the FD flow through line 25 is blocked by the check valve 6.
  • the position of the valve 27 determines the rate of the FD flow, thus the speed profile of the car as it descends.
  • the valve is moved from the closed P1 position by the SPEED signal towards the open position P2. The duration and frequency of the SPEED signal sets the down velocity profile.
  • switch 70 that is adjacent the MCV 40, and the upward motion of the MCV 40 causes the switch to operate. That operation provides a signal (CV) on the line 71 going to the PVC 17.
  • the CV signal shows that the valve has moved in the up direction for elevator travel. It represents that the pressure in the chamber 35 has slightly exceeded the pressure in the chamber 43.
  • the PVC may control the further motion of the valve spool by controlling the pulse rate and duration comprising the SPEED signal, which is applied to the line 29.
  • the CV signal occurs just when the pressure of PS1 35 exceeds the pressure PS2, and that occurs just before there is actual flow. Generation of the CV signal consequently provides a definitive manifestation of "anticipated" flow.
  • the stepper motor controlled valve 27 also provides a pressure release function for the port 35.
  • the stepper motor 28 has an output link 28a, and a collar or ring 28b is attached to that link.
  • the link and collar fit in a hollow portion of the valve 27 but separated from the flow area (windows 26a, 26b) by the valve wall 27a, which is opposite another wall 27b.
  • the valve 27 is shaped like a hollow cylinder; fluid flows through its interior).
  • a spring 28c fits between the wall 27b and the collar 28b.
  • the change in flow is controlled by the smaller valve window area to outlet port 31, which reduces as the main valve begins to move towards the closed position at P1, at which all the FU flow passes from the port 25 to the inlet 35; there being no path between the port 25 and the outlet port 31.
  • This link motion is transmitted to the wall 27a through the spring to the valve 27, which moves in synchronism with the link. If the pressure in the pump output line 21a is sufficient to open the pressure release valve (PRV), the pressure is applied to the top of the valve 27b and the entire valve 27 is forced down, allowing the flow from the pump to pass through the line 32, to the tank 5, to relieve the "overpressure" condition.
  • PRV pressure release valve
  • a manually operated valve 80 is operated to allow the fluid to flow from the chamber 43 directly back to the tank 5.
EP19860308993 1985-11-18 1986-11-18 Druckbezogene programmierte Durchflusssteuerung in einem hydraulischen Ventil Expired EP0227296B1 (de)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
US79976585A 1985-11-18 1985-11-18
US79966585A 1985-11-18 1985-11-18
US799765 1985-11-18
US799665 1985-11-18
US06/853,284 US4700748A (en) 1985-11-18 1986-04-17 Pressure-referenced programmed flow control in a hydraulic valve
US853284 1986-04-17
US853286 1986-04-17
US06/853,286 US4674527A (en) 1985-11-18 1986-04-17 Pressure relieving linear motion valve

Publications (3)

Publication Number Publication Date
EP0227296A2 true EP0227296A2 (de) 1987-07-01
EP0227296A3 EP0227296A3 (en) 1989-03-22
EP0227296B1 EP0227296B1 (de) 1992-03-11

Family

ID=27505803

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860308993 Expired EP0227296B1 (de) 1985-11-18 1986-11-18 Druckbezogene programmierte Durchflusssteuerung in einem hydraulischen Ventil

Country Status (6)

Country Link
EP (1) EP0227296B1 (de)
CN (1) CN1010970B (de)
AU (1) AU604000B2 (de)
DE (1) DE3684262D1 (de)
FI (1) FI90036C (de)
NZ (1) NZ218082A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0265729A2 (de) * 1986-10-17 1988-05-04 Cemcolift, Inc. Selbsteinstellbares Ventil für Aufzüge
US5014824A (en) * 1990-01-19 1991-05-14 Otis Elevator Company Hydraulic elevator control valve
US5082091A (en) * 1990-01-19 1992-01-21 Otis Elevator Company Hydraulic elevator control

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3892292A (en) * 1971-09-17 1975-07-01 Hitachi Ltd Hydraulic elevators
CH578478A5 (en) * 1974-06-11 1976-08-13 Sig Schweiz Industrieges Hydraulically operated platform control system - has motor driving screwed spindle passing through control plunger
US3977497A (en) * 1975-02-26 1976-08-31 Armor Elevator Company, Inc. Hydraulic elevator drive system
US4418794A (en) * 1981-06-16 1983-12-06 Otis Elevator Company Electromechanical control for hydraulic elevators
WO1986006359A1 (en) * 1985-04-30 1986-11-06 Pentti Rita Electrically controlled valve apparatus

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3391702A (en) * 1965-12-14 1968-07-09 Gen Electric Liquid flow systems
JPS5326378B2 (de) * 1972-03-15 1978-08-02
US4726450A (en) * 1985-11-18 1988-02-23 Otis Elevator Company Hydraulic elevator with dynamically programmed motor-operated valve

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3892292A (en) * 1971-09-17 1975-07-01 Hitachi Ltd Hydraulic elevators
CH578478A5 (en) * 1974-06-11 1976-08-13 Sig Schweiz Industrieges Hydraulically operated platform control system - has motor driving screwed spindle passing through control plunger
US3977497A (en) * 1975-02-26 1976-08-31 Armor Elevator Company, Inc. Hydraulic elevator drive system
US4418794A (en) * 1981-06-16 1983-12-06 Otis Elevator Company Electromechanical control for hydraulic elevators
WO1986006359A1 (en) * 1985-04-30 1986-11-06 Pentti Rita Electrically controlled valve apparatus

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0265729A2 (de) * 1986-10-17 1988-05-04 Cemcolift, Inc. Selbsteinstellbares Ventil für Aufzüge
EP0265729A3 (de) * 1986-10-17 1989-05-03 Cemcolift, Inc. Selbsteinstellbares Ventil für Aufzüge
US5014824A (en) * 1990-01-19 1991-05-14 Otis Elevator Company Hydraulic elevator control valve
EP0437995A2 (de) * 1990-01-19 1991-07-24 Otis Elevator Company Hydraulisches Aufzugsteuerventil
US5082091A (en) * 1990-01-19 1992-01-21 Otis Elevator Company Hydraulic elevator control
EP0437995A3 (en) * 1990-01-19 1992-08-05 Otis Elevator Company Hydraulic elevator control valve

Also Published As

Publication number Publication date
DE3684262D1 (de) 1992-04-16
FI864662A (fi) 1987-05-19
AU6518086A (en) 1987-05-21
AU604000B2 (en) 1990-12-06
CN86107735A (zh) 1987-06-17
EP0227296A3 (en) 1989-03-22
FI864662A0 (fi) 1986-11-17
EP0227296B1 (de) 1992-03-11
CN1010970B (zh) 1990-12-26
FI90036B (fi) 1993-09-15
FI90036C (fi) 1993-12-27
NZ218082A (en) 1988-10-28

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