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Methods and system for engine control

  • US 10,018,143 B2
  • Filed: 08/19/2016
  • Issued: 07/10/2018
  • Est. Priority Date: 08/19/2016
  • Status: Active Grant
First Claim
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1. A method for fueling a cylinder, comprising:

  • injecting fuel to the cylinder via a first fuel injector and a second fuel injector; and

    distinguishing, by processing an exhaust sensor and determining an error associated with the first fuel injector or the second fuel injector from a common fuel system error as a function of a rate of change of air-fuel ratio error and a fraction of fuel injected via the first fuel injector or the second fuel injector, including learning at least a portion of the air-fuel ratio error as the common fuel system error based on whether a first ratio of the rate of change of air-fuel ratio error to the fraction of fuel injected via the first fuel injector is within a threshold of a second ratio of the rate of change of air-fuel ratio error to the fraction of fuel injected via the second fuel injector and whether each of the first ratio and the second ratio is higher than a threshold value.

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