×

Automotive engine signal digitization

  • US 5,063,515 A
  • Filed: 06/30/1989
  • Issued: 11/05/1991
  • Est. Priority Date: 06/30/1989
  • Status: Expired due to Term
First Claim
Patent Images

1. Apparatus for digitizing a cyclical automotive cylinder ignition signal having a maximum value occurring at spark and varying frequency and amplitude thereafter, comprising:

  • sensor means, for providing a sensed signal indicative of the actual value of an automotive cylinder ignition parameter; and

    signal processing means, responsive to said sensed signal, for sampling of said sensed signal at first predetermined time intervals and providing signals indicative of the value of said sensed signal sampled thereat, for comparing each said sampled first interval signal to a predetermined threshold signal to determine a transition occurrence of said sensed signal towards a maximum spark value, for sampling of said sensed signal, following said sensed signal transition occurrence, at said second intervals for a predetermined number of said second intervals and providing signals indicative of the value of said sensed signal sampled thereat, for determining a maximum spark value signal from among said sampled second interval signals, for sampling of said sensed signal, following said predetermined number of second intervals, at said third intervals and providing signals indicative of the value of said sensed signal sampled thereat, said first, second and third intervals being shorter in duration than a fourth predetermined time interval, and for determining a maximum displacement signal during each said fourth interval as the one of said sampled third interval signals sampled during an associated one of said fourth intervals having the greatest absolute value displacement from a maximum displacement signal determined during a preceding one of said fourth intervals.

View all claims
  • 19 Assignments
Timeline View
Assignment View
    ×
    ×