Elevator system
First Claim
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1. An elevator system, comprising:
- an elevator car,motive means for said elevator car,speed pattern means providing a speed pattern signal indicative of the desired speed of said elevator car,means providing a velocity signal responsive to the actual speed of said elevator car,controllable impedance means,control means providing a first control signal responsive to at least one predetermined parameter of said speed pattern signal, said control means including reference means providing a first reference signal relative to said at least one predetermined parameter, said control means modifying the impedance of said controllable impedance means in response to a predetermined relationship between said first control signal and said first reference signal,and error signal means providing an error signal for controlling said motive means in response to said velocity signal and said speed pattern signal,said controllable impedance means being connected to modify the affect of said speed pattern signal on said error signal means, at least when its impedance is modified by said control means.
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Abstract
An elevator system in which the movement of the elevator car is responsive to a comparator which provides an error signal responsive to the difference between the magnitude of a speed pattern signal provided by a speed pattern generator, and a signal responsive to actual car speed. An adjustable impedance device controls the affect of the speed pattern signal on the comparator, with the impedance of the adjustable impedance device being responsive to at least one predetermined parameter of the speed pattern signal.
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Citations
17 Claims
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1. An elevator system, comprising:
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an elevator car, motive means for said elevator car, speed pattern means providing a speed pattern signal indicative of the desired speed of said elevator car, means providing a velocity signal responsive to the actual speed of said elevator car, controllable impedance means, control means providing a first control signal responsive to at least one predetermined parameter of said speed pattern signal, said control means including reference means providing a first reference signal relative to said at least one predetermined parameter, said control means modifying the impedance of said controllable impedance means in response to a predetermined relationship between said first control signal and said first reference signal, and error signal means providing an error signal for controlling said motive means in response to said velocity signal and said speed pattern signal, said controllable impedance means being connected to modify the affect of said speed pattern signal on said error signal means, at least when its impedance is modified by said control means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An elevator system, comprising:
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an elevator car, motive means for said elevator car, speed pattern means providing a speed pattern signal indicative of the desired speed of said elevator car, means providing a velocity signal responsive to the actual speed of said elevator car, controllable impedance means, absolute value means providing a single polarity absolute value signal responsive to the absolute value of said speed pattern signal, control means providing a first control signal responsive to the magnitude of the absolute value signal, and a second control signal responsive to the rate of change of the absolute value signal, reference means providing first and second reference signals responsive to desired maximum values for the magnitude of the absolute value signal, and the rate of change of the absolute value signal, respectively, first comparator means providing a first modification signal which modifies the impedance of said controllable impedance means when the first control signal exceeds the first reference signal, second comparator means providing a second modification signal which modifies the impedance of said controllable impedance means when the second control signal exceeds the second reference signal, and error signal means providing an error signal for controlling said motive means in response to said velocity signal and said speed pattern signal, said controllable impedance means being connected to modify the effect of said speed pattern signal on said error signal means, at least when its impedance is modified by at least one of the first and second comparator means. - View Dependent Claims (15, 16)
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17. An elevator system, comprising:
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an elevator car, motive means for said elevator car, speed pattern means providing a speed pattern signal indicative of the desired speed of said elevator car, means providing a velocity signal responsive to the actual speed of said elevator car, controllable impedance means, control means providing a first control signal responsive to at least one predetermined parameter of said velocity signal, said control means including reference means providing a first reference signal relative to said at least one predetermined parameter, said control means modifying the impedance of said controllable impedance means in response to a predetermined relationship between said first control signal and said first reference signal, and error signal means providing an error signal for controlling said motive means in response to said velocity signal and said speed pattern signal, said controllable impedance means being connected to modify the affect of the speed pattern signal on said error signal means, at least when its impedance is modified by said control means.
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Specification