Patent ID: 6617857
Filing Date: 2003-09-09
Classification: F02P

Abstract:
An engine analyzer for sensing and displaying secondary ignition signals from an engine having a DIS ignition system, the engine analyzer comprising:a first set of leads for connection to the DIS ignition system; second set of leads for connection to the DIS ignition system; peak detection circuitry connected to the first and second sets of leads for producing, for each cylinder firing event, four separate peak values which represent (a) a positive-going peak value for the first set of leads, (b) a negative-going peak value for the first set of leads, (c) a positive-going peak value for the second set of leads, and (d) a negative-going peak value for the second set of leads; means for selecting which lead set and which polarity is used to supply a secondary voltage signal for each cylinder based upon the peak values for that cylinder; means for digitizing the secondary voltage signal; and means for displaying information based upon the digitized secondary voltage signal.