ENGINE CONTROL SYSTEM
First Claim
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1. In an engine, a speed monitor and control system comprising:
- sensing means positioned so as to measure rotational speed of the engine, means generating an actual speed signal proportional to sensed rotational speed, said signal being directed along two separate paths, first reference means creating a first reference signal proportional to a desired maximum rotational speed, first comparator means receiving the signal from one of said paths for comparing said actual speed signal with said first reference signal, engine shutdown means for shutting down the engine when said actual speed signal passes said maximum rotational speed, second reference means creating a second reference signal proportional to a desired minimum rotational speed which is less than said maximum rotational speed, second comparator means receiving the signals from the other of said paths for comparing said actual speed signal with said second reference signal, and warning means operable by said second comparator means for indicating a speed below said desired minimum, and wherein said means for generating an actual speed signal comprises means generating an output signal in the form of a sine wave, means converting said sine wave output signal into a square wave output signal for each sine wave, means differentiating said square wave output signal into an output signal in the form of positive and negative pulses, means converting said positive pulses into an output signal in the form of square waves having fixed width and height and sending said negative pulses to ground, and means integrating said square waves having fixed width and height so as to produce said actual speed signal.
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Abstract
A control system for monitoring and controlling an engine as a function of engine speed is provided. The control system includes a control device which continuously monitors engine speed sensed through a magnetic pickup means and causes engine shutdown by means of an engine shutdown device when an overspeed condition occurs. In addition, the control device actuates a warning device when an underspeed condition occurs.
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Citations
4 Claims
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1. In an engine, a speed monitor and control system comprising:
- sensing means positioned so as to measure rotational speed of the engine, means generating an actual speed signal proportional to sensed rotational speed, said signal being directed along two separate paths, first reference means creating a first reference signal proportional to a desired maximum rotational speed, first comparator means receiving the signal from one of said paths for comparing said actual speed signal with said first reference signal, engine shutdown means for shutting down the engine when said actual speed signal passes said maximum rotational speed, second reference means creating a second reference signal proportional to a desired minimum rotational speed which is less than said maximum rotational speed, second comparator means receiving the signals from the other of said paths for comparing said actual speed signal with said second reference signal, and warning means operable by said second comparator means for indicating a speed below said desired minimum, and wherein said means for generating an actual speed signal comprises means generating an output signal in the form of a sine wave, means converting said sine wave output signal into a square wave output signal for each sine wave, means differentiating said square wave output signal into an output signal in the form of positive and negative pulses, means converting said positive pulses into an output signal in the form of square waves having fixed width and height and sending said negative pulses to ground, and means integrating said square waves having fixed width and height so as to produce said actual speed signal.
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2. The invention of claim 1 wherein said sensing means is a magnetic pickup.
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3. The invention of claim 1 wherein said warning means for indicating an underspeed condition comprise audible means.
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4. The invention of claim 3 wherein said warning means for indicating an underspeed condition comprise visual means.
Specification
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Current AssigneeCaterpillar Incorporated
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Original AssigneeRoger R. Weis
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InventorsWeis, Roger R.
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Primary Examiner(s)Goodridge, Laurence M.
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Assistant Examiner(s)Flint, Cort
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Application NumberUS05/247,651Time in Patent Office839 DaysField of Search123/148S,102,198DC,198DB,118 290/4AUS Class Current123/351CPC Class CodesG01P 1/103 by comparing the value of t...G01P 3/4805 by using circuits for the e...
