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System and method of compensating for injector variability

  • US 5,839,420 A
  • Filed: 06/04/1997
  • Issued: 11/24/1998
  • Est. Priority Date: 06/04/1997
  • Status: Expired due to Term
First Claim
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1. A method of calibrating an electronically controlled fuel injector, the method comprising the steps of:

  • establishing reference energizing times which correspond to fuel injection at each of at least two predetermined engine conditions;

    determining true energizing times for the injector which correspond to fuel injection at each of the predetermined engine conditions;

    selecting one of a plurality of predetermined calibration categories for each engine condition based on each true energizing time relative to the corresponding reference energizing time;

    assigning a calibration code to the injector indicative of the calibration categories; and

    marking the injector with the calibration code.

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