US3785463A
Expired / Lapsed
US
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Final stopping control
Assignee: Reliance Electric Co
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Filing: 1972-05-09
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Granted: 1974-01-15
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Expires: 1992-05-09
Abstract
Abstract A pattern generator for controlling the terminal portion of the travel of an object along a fixed path. The pattern is a velocity signal which diminishes as the object approaches its destination whereby a smooth stop is dictated. The generator is particularly adapted to the final stopping of vehicles for passengers and is illustrated as the source of control signals for driving an elevator. As an elevator pattern generator, it integrates the pattern signal velocity as represented by voltages when the car is at a point within a given distance from a landing to provide a signal representing displacement. The required displacement to the stop is proportioned to the actual velocity of the car at that point to define a leveling pattern as the product of the proportioning factor and the velocity. As a compromise between square root function, which would afford smoothness and require a long stopping interval, and a straight line function, which would provide minimum transition time to zero velocity and impose infinite jerk at the stop position, the integrated signal is modified as a function of the integrated signal value during approach to the stop. The pattern signal upon initiation of leveling is corrected if a significant disparity with the predetermined desired speed occurs.
Inventors
- 👤 J Kuhl
- 👤 R Lauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:10
CPC Classifications
B; B66; B66B; B66B1/00; B66B1/24; B66B1/28; B66B1/285; B66B1/34; B66B1/36
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
126 words
A velocity pattern generation system for controlling the movement of an object through a zone between two points along a predetermined path comprising, means to define the arrival of said object at one of said points in its approach to said zone; a primary velocity pattern generator to issue a variable primary velocity pattern signal for said object; a signal storage means for an initial pattern velocity signal value representing said variable primary velocity pattern signal as generated by said primary velocity pattern generator at the time said object arrives at said one point; means continuously to define displacement of said object within said zone; and means continuously to proportion said initial velocity pattern signal to a predetermined value as a function of said defined displacement.
Claim 2
Dependent Claim
126 words
A velocity pattern generation system for controlling the movement of an object through a zone between two points along a predetermined path comprising, means to define the arrival of said object at one of said points in its approach to said zone; a primary velocity pattern generator to issue a variable primary velocity pattern signal for said object; a signal storage means for an initial pattern velocity signal value representing said variable primary velocity pattern signal as generated by said primary velocity pattern generator at the time said object arrives at said one point; means continuously to define displacement of said object within said zone; and means continuously to proportion said initial velocity pattern signal to a predetermined value as a function of said defined displacement.
Claim 3
Dependent Claim
14 words
A combination according to claim 1 wherein said signal storage means is a capacitance.
Claim 4
Dependent Claim
14 words
A combination according to claim 1 wherein said signal storage means is an integrator.
Claim 5
Dependent Claim
19 words
A combination according to claim 1 wherein said means to define displacement of said object is a velocity integrator.
Claim 6
Dependent Claim
34 words
A combination according to claim 1 wherein said means to define displacement of said object includes means to develop a signal proportional to the velocity of said object and means to integrate said signal.
Claim 7
Dependent Claim
24 words
A combination according to claim 5 wherein said proportioning means is a multiplier for multiplying the initial velocity pattern signal and the integrated signal.
Claim 8
Dependent Claim
32 words
A combination according to claim 6 including amplifier means for the integrated signal; and means to alter the gain of said amplifier means in accordance with the value of said integrated signal.
Claim 9
Dependent Claim
37 words
A combination according to claim 7 wherein said gain altering means is a plurality of parallel diode-resistor series combinations each having different diode cut off values and coupled between an input and an output of said amplifier.
Claim 10
Dependent Claim
38 words
A combination according to cLaim 1 including means to gradually adjust the initial velocity signal value in said signal storage means to an optimum initial velocity signal when said initial velocity signal deviates from said optimum velocity signal.
Claim 11
Dependent Claim
32 words
A combination according to claim 1 wherein said object is an elevator car, said zone is a leveling zone and one of said points is a landing associated with said leveling zone.
Claim 12
Dependent Claim
52 words
A combination according to claim 10 including first means for ascertaining the approach of said elevator car within a given distance of a landing; a leveling switch comprising said means to define arrival of said car at said one point; and means responsive to said first means for enabling said leveling switch.
Claim 13
Dependent Claim
23 words
A combination according to claim 1 wherein one of said points along said predetermined path is defined by a count scaled to displacement.
Claim 14
Dependent Claim
24 words
A combination according to claim 12 wherein said count is converted to an analog signal and including a detector responsive to said analog signal.
Claim 15
Dependent Claim
55 words
A combination according to claim 1 wherein said primary velocity pattern generator includes an acceleration pattern output and an acceleration signal to velocity signal integrator having an input and an output; a first switch between said acceleration pattern output and said integrator input; and means responsive to said arrival defining means to operate said switch.
Claim 16
Dependent Claim
56 words
A combination according to claim 14 including a second switch coupled to said integrator input, a signal source of a signal which is scaled to a desired primary pattern velocity signal for said object upon arrival of said object at said one point, and means responsive to said arrival defining means to close said second switch.
Claim 17
Dependent Claim
80 words
A combination according to claim 1 wherein said predetermined value is a value less than said initial value, and including means to maintain a minimum velocity pattern signal in excess of said predetermined value while said object is in said zone and until said object reaches the other of said two points, whereby said maintaining means supersedes said proportioning means when said proportioning means reduces said signal below said minimum velocity pattern signal while said object is in said zone.
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) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |