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Method for analyzing injector performance

  • US 9,605,611 B2
  • Filed: 11/25/2013
  • Issued: 03/28/2017
  • Est. Priority Date: 11/25/2013
  • Status: Active Grant
First Claim
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1. A method for detecting injector drift on an internal combustion engine, the methodcomprising the steps of:

  • establishing at least first and second patterns of fuel injection pulses for application to a cylinder of the internal combustion engine with the first and second patterns differing in number of fuel injection pulses while having the same nominal target amount of fuel to deliver;

    operating the engine at a target level steady state condition with the injectors for all cylinders being active;

    selecting a first cylinder to test;

    injecting fuel to the selected cylinder using each of the first and second patterns at least once during a period;

    determining if engine speed varies with correlation to the first and second patterns of fuel injection pulses injected into the first cylinder;

    terminating variation of fuel injection into the first cylinder with both first and second patterns of fuel injection pulses;

    selecting a second cylinder to test;

    injecting fuel into the second cylinder using each of the first and second patterns at least once during a period;

    determining if engine speed varies with correlation to the first and second patterns of fuel injection pulses injected into the second cylinder.

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