SYSTEM FOR GOVERNING THE SPEED OF RAILWAY VEHICLES
First Claim
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1. A system for governing the speed of a railway vehicle in accordance with comparison of a desired speed signal with an actual speed signal derived from an axle-driven frequency generator wherein the improvement comprises;
- a. means comprising an oscillator for generating pulses at a fixed rate and means for dividing the frequency of the oscillator to generate successive timing gate pulses of the same selected relatively long duration, b. timing gate modifying means comprising a wheel wear switch for at times incrementally modifying the time duration of the timing gate pulses in accordance with changes in wheel diameter, c. means responsive to the axle frequency generator and rendered effective only during each timing gate pulse for dividing the axle generator frequency and generating a series of speed pulses corresponding to the divided frequency, d. counting means for counting the speed pulses during each timing gate pulse and delivering a digital speed output upon termination of each timing gate pulse corresponding to the number of speed pulses counted during the associated gate pulse, and e. control means governed jointly by the digital speed output and by the desired speed signal for governing the speed of operation of the vehicle.
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Abstract
Traction and braking of a train is governed by comparing a desired speed signal with digital speed signals that are periodically generated indicative of actual speed of the train. The digital speed signals are attained by counting frequency pulses of an axle driven frequency generator during successive time gate periods. Means is provided for modifying the time duration of the time gate in accordance with changes in diameter of a wheel of the vehicle. The digital output is in miles per hour and is also used to control a speed indicator.
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Citations
5 Claims
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1. A system for governing the speed of a railway vehicle in accordance with comparison of a desired speed signal with an actual speed signal derived from an axle-driven frequency generator wherein the improvement comprises;
- a. means comprising an oscillator for generating pulses at a fixed rate and means for dividing the frequency of the oscillator to generate successive timing gate pulses of the same selected relatively long duration, b. timing gate modifying means comprising a wheel wear switch for at times incrementally modifying the time duration of the timing gate pulses in accordance with changes in wheel diameter, c. means responsive to the axle frequency generator and rendered effective only during each timing gate pulse for dividing the axle generator frequency and generating a series of speed pulses corresponding to the divided frequency, d. counting means for counting the speed pulses during each timing gate pulse and delivering a digital speed output upon termination of each timing gate pulse corresponding to the number of speed pulses counted during the associated gate pulse, and e. control means governed jointly by the digital speed output and by the desired speed signal for governing the speed of operation of the vehicle.
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2. The invention according to claim 1 wherein the counting means includes a frequency divider for dividing the frequency output of the axle generator by a factor such that the digital speed output signal manifests the speed of the vehicle in m.p.h.
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3. The invention according to claim 1 wherein storage means is provided for storing the last output of the counting means and speed indicator means is provided for registering the speed of the vehicle as stored by the storage means.
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4. The invention according to claim 1 wherein the control means comprises an up-down counter that is selectively stepped up or down in accordance with comparison of the desired speed signal and the digital speed output signals.
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5. The invention according to claim 4 wherein the control means comprises train traction and braking means that is controlled by the up-down counter.
Specification
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Current AssigneeSimon Reich
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Original AssigneeSimon Reich
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InventorsReich, Simon
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Primary Examiner(s)La Point, Arthur L.
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Assistant Examiner(s)Libman, George H.
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Application NumberUS04/857,974Time in Patent Office869 DaysField of Search246/182B,182C,187C 324/173US Class Current246/182.00CCPC Class CodesH02P 23/16 Controlling the angular spe...
