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US3743055A
Expired / Lapsed
US
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Electronic motion control system for elevators
Assignee: Elevator Corp
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Filing: 1971-08-04
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Granted: 1973-07-03
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Expires: 1991-08-04
Abstract
Abstract An elevator control system that utilizes a digital signal representative of the car position to provide the necessary information inputs to the selective logic system and motor control so that a smooth acceleration to maximum velocity and deceleration to stop at a selected floor. A drum selector is utilized to produce the digital number corresponding to elevator position. The motion input to this drum selector is linked to actual elevator motion. The system includes electronic provision for simulating the advance of the car position an amount dependent on it''s velocity and locks out all floors behind that advanced position in order to allow adequate time for deceleration. The velocity command is compared to actual velocity and the power control section called on to make up any difference. Differences persisting for a period of time produce increasing commands in response, while damping means prevent overshoot.
Inventors
- 👤 W Hoelscher
- 👤 A Vildibill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:24
CPC Classifications
B; B66; B66B; B66B1/00; B66B1/34; B66B1/3492; B66B1/24; B66B1/28; B66B1/30; B66B1/46; B66B1/52
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
135 words
An electronic system for controlling elevator motion comprising: digital position means for producing a continuous series of digital signals providing a unique digital signal for each incremental linear position of the elevator car away from a single reference position within a hoistway, digital selector means for generating a signal representing the linear position of a selected floor and combining both said linear positions to produce a digital signal representing the distance to the selected floor, deceleration signal means for utilizing said signal representing the distance to a selected floor to generate an electrical analog of desired velocity at selected distances to said floor, error means for comparing actual and desired car velocity signals, and power control means for responding to the output of said error means and controlling the power to an elevator motive means.
Claim 2
Dependent Claim
135 words
An electronic system for controlling elevator motion comprising: digital position means for producing a continuous series of digital signals providing a unique digital signal for each incremental linear position of the elevator car away from a single reference position within a hoistway, digital selector means for generating a signal representing the linear position of a selected floor and combining both said linear positions to produce a digital signal representing the distance to the selected floor, deceleration signal means for utilizing said signal representing the distance to a selected floor to generate an electrical analog of desired velocity at selected distances to said floor, error means for comparing actual and desired car velocity signals, and power control means for responding to the output of said error means and controlling the power to an elevator motive means.
Claim 3
Dependent Claim
173 words
An electronic system for controlling elevator motion comprising: digital position means for producing a digital signal corresponding to the linear position of an elevator car within a hoistway, digital selector means for generating a signal representing the linear position of a selected floor and combining both said linear positions to produce a digital signal representing the distance to the selected floor, dEceleration signal means for utilizing said signal representing the distance to a selected floor to generate an electrical analog of desired velocity at selected distances to said floor, error means for comparing actual and desired car velocity signals, power control means for responding to the output of said error means and controlling the power to an elevator motive means, said digital position means comprising a plurality of rotatable discs driven by a drum, said discs have spaced openings in a plurality of tracks to pass the illumination of light sources to sensors associated with each of said tracks, and reduction means between said discs for reducing the relative speed of adjacent discs.
Claim 4
Dependent Claim
173 words
An electronic system for controlling elevator motion comprising: digital position means for producing a digital signal corresponding to the linear position of an elevator car within a hoistway, digital selector means for generating a signal representing the linear position of a selected floor and combining both said linear positions to produce a digital signal representing the distance to the selected floor, dEceleration signal means for utilizing said signal representing the distance to a selected floor to generate an electrical analog of desired velocity at selected distances to said floor, error means for comparing actual and desired car velocity signals, power control means for responding to the output of said error means and controlling the power to an elevator motive means, said digital position means comprising a plurality of rotatable discs driven by a drum, said discs have spaced openings in a plurality of tracks to pass the illumination of light sources to sensors associated with each of said tracks, and reduction means between said discs for reducing the relative speed of adjacent discs.
Claim 5
Dependent Claim
19 words
The elevator system of claim 2 wherein said sensors comprise photodiodes sensitive to the infrared portion of the spectrum.
Claim 6
Dependent Claim
123 words
An electronic system for controlling elevator motion comprising: velocity selector means for producing a signal that is an electrical analog of desired car velocity, error means for comparing actual and desired car velocity signals, power control means for responding to the output of said output means and controlling the power to an elevator motive means, said power control means comprising generator field current biasing means for varying the input voltage from a source to said generator field to change the current flow in the minimum time possible with the source available, and said generator field current biasing means comprising an oscillator modulated by a difference signal produced by comparing the output of said error means and a signal representing said generator field current.
Claim 7
Dependent Claim
123 words
An electronic system for controlling elevator motion comprising: velocity selector means for producing a signal that is an electrical analog of desired car velocity, error means for comparing actual and desired car velocity signals, power control means for responding to the output of said output means and controlling the power to an elevator motive means, said power control means comprising generator field current biasing means for varying the input voltage from a source to said generator field to change the current flow in the minimum time possible with the source available, and said generator field current biasing means comprising an oscillator modulated by a difference signal produced by comparing the output of said error means and a signal representing said generator field current.
Claim 8
Dependent Claim
22 words
The electronic system of claim 4 wherein: said power control means includes solid state switches for switching power sources having opposite polarization.
Claim 9
Dependent Claim
19 words
The electronic system of claim 5 wherein: said power control means includes means for grounding excessive reverse voltage surges.
Claim 10
Dependent Claim
21 words
The electronic system of claim 4 wherein: said switches are disabled during the on cycle of the switch of opposite polarity.
Claim 11
Dependent Claim
87 words
An electronic system for controlling elevator motion comprising: velocity selector means for producing a signal that is an electrical analog of desired car velocity; error means for comparing actual and desired car velocity signals; power control means for responding to the output of said error means and controlling the power to an elevator motive means; said error means including residual error means for increasing the output of said error means when an error of long time duration is present; and damping means for preventing actual velocity overshoot.
Claim 12
Dependent Claim
87 words
An electronic system for controlling elevator motion comprising: velocity selector means for producing a signal that is an electrical analog of desired car velocity; error means for comparing actual and desired car velocity signals; power control means for responding to the output of said error means and controlling the power to an elevator motive means; said error means including residual error means for increasing the output of said error means when an error of long time duration is present; and damping means for preventing actual velocity overshoot.
Claim 13
Dependent Claim
28 words
The system of claim 8 wherein: said error means includes local signal means to utilize a local signal for deceleration during the close approach to a stopping point.
Claim 14
Dependent Claim
31 words
The system of claim 9 wherein: said local signal means comprises a sensor mounted on said car and means for varying the output of said sensor with displacement of said car.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |