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APPARATUS FOR PRECISELY INDICATING POSITION OF ROTATIONAL MACHINERY

  • US 3,813,931 A
  • Filed: 03/15/1973
  • Issued: 06/04/1974
  • Est. Priority Date: 03/15/1973
  • Status: Expired due to Term
First Claim
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1. In combination, an internal combustion engine having rotating parts and a device for generating a synchronization pulse precisely indicating a predetermined position in the rotation cycle of the rotating parts of said internal combustion engine, said device comprising:

  • a marker on one of said rotating parts, sensor means responsive to said marker for generating a pulse signal when the rotating parts are in the vicinity of said predetermined position, means responsive to the output of the sensor means for generating a synchronization pulse which occupies a fraction of the time cycle of the pulse output signal of said sensor means, said last mentioned means comprising a ramp generator for generating a ramp signal in response to the output of said sensor means, means for selecting a DC signal which is a percentage of the peak of the ramp signal, and a voltage comparator receiving said ramp signal and the selected DC signal for providing said synchronization pulse at a point on the ramp signal equal to the selected DC signal, visual marker means on said engine indicative of said predetermined position, a strobe lamp for strobing said marker means, the synchronization pulses being used to ignite the strobe lamp, and means for adjusting the timing of said synchronization pulse within the range of the pulse signal output of said sensor means to synchronization with the strobing of the visual marker means, said adjusting means comprising a peak detector and hold circuit for detecting the peak of the ramp signal and holding a voltage corresponding to said peak signal and a potentiometer for selecting a percentage of said peak signal to provide the selected DC signal, the selected DC signal being fed from the potentiometer to the comparator for comparison with the ramp signal.

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