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    • 1. 发明授权
    • Elevator control
    • 电梯控制
    • US3612220A
    • 1971-10-12
    • US3612220D
    • 1969-10-29
    • RELIANCE ELECTRIC & ENG CO
    • HALL DONIVAN LLOSHBOUGH RICHARD CROBASZKIEWICZ GERALD D
    • B66B1/16B66B1/24B66B1/30
    • B66B1/285
    • A commanded position signal generator adapted for position based servocontrols as applied for example to elevators wherein the commanded position at which the controlled object will stop while subject to constraints of constant jerk, constant maximum acceleration, and constant maximum velocity is indicated through accelerating and constant velocity intervals. Stopping distance computation is performed in a first computation mechanism throughout the interval the commanded position signal is operating in an accelerating mode. Means recognize the mode of commanded position signal generation which is currently effective. As acceleration is curtailed to bring the commanded position signal into a constant velocity mode, a storage mechanism maintains the final maximum acceleration mode computed stop position for the pattern as the position at which the pattern would stop. During the constant maximum velocity mode of the commanded position signal, another computing mechanism indicates the predicted stop position. Each predicted stop position signal is compared to the signals for stops requested by registered calls for service and when a desired relationship between the predicted stop position signal and the call position signal exist the stop of the commanded pattern is initiated. Generation of a precise commanded position signal during the terminal portion of a run is enhanced by shifting from an initial position base for the signal to a final position base at a point in the signal generation when no discontinuity is encountered.