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SYSTEM FOR ANALYZING ENGINE PERFORMANCE

  • US 3,777,559 A
  • Filed: 04/21/1972
  • Issued: 12/11/1973
  • Est. Priority Date: 04/21/1972
  • Status: Expired due to Term
First Claim
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1. In a system for determining the performance of an internal combustion engine having a plurality of cylinders, said system including means for sensing various engine operating parameters, the improvement comprising means for indicating the values of said parameters during a precisely defined portion of the engine operating cycle, comprising:

  • means for generating a reference pulse signal indicative of a predetermined point in each operating cycle of the engine, means for generating a train of pulses, a first counter means for counting the output of said pulse train generating means, divider means for Dividing the output of said pulse train generating means by a factor corresponding to the number of cylinders in said engine, second counter means for counting the output of said divider means, register means for receiving the output count of said second counter means, the output of said reference signal generating means being fed to said second counter means and said register means to provide a reset signal therefor, comparator means receiving the outputs of said first counter means and said register means for generating an output signal when the output of said register means corresponds to the output of said first counter means, the output of said comparator means corresponding to the operating cycle of each of the engine cylinders, window generator means for generating window signals in response to the output of said comparator means, sensor circuit means for receiving the outputs of said sensing means and generating a signal in accordance therewith, said sensor circuit means including a gating circuit, and indicator means for receiving the outputs of said sensor circuit means and providing an indication thereof, the window signals being fed to the gating circuit of said sensor circuit means to gate the outputs thereof to said indicator means at preselected portions of the rotation cycle of said engine.

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