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US 4,046,229 AGranted
Elevator system
AssigneeWestinghouse Electric Corp.
InventorsAndress Kernick, Manvel A. Geyer
Life of this patent
Estimating the term…
Abstract
An elevator system which includes speed control apparatus which provides an error count representing the deviation of an elevator car from a desired speed versus distance reference pattern. Both the instantaneous and cumulative errors are indicated by the error count, and both are simultaneously corrected with digital precision by direct utilization of the error count. Anticipatory control of non-linear actuators responsive to the rate at which the cumulative error is corrected makes the system time optimal.
Claims12
An elevator system, comprising:
- an elevator car to be stopped at a predetermined stopping point,
- first means providing a first train of pulses responsive to the movement of the elevator car, with each pulse indicating a predetermined increment of car movement,
- second means providing a second train of pulses responsive to the desired movement of the elevator car from increment to increment up to the stopping point,
- counter means responsive to said first and second trains of pulses such that its output count indicates which pulse train has produced the greater number of pulses, and the precise number of the difference, to provide both a qualitative and a quantitative indication of error, respectively, and
- control means for controlling the deceleration of the elevator car in response to the count on said counter means, with the control means selecting one of at least first and second deceleration efforts, with the first deceleration effort being selected when the count indicates the number of pulses in the first pulse train exceeds those in the second pulse train, and with said second deceleration effort being selected when the count indicates the number of pulses in the second pulse train exceeds those in the first pulse train.
2 more elements
Dependencies are inferred from the claim text.