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Engine diagnostics with skip fire control

  • US 9,212,610 B2
  • Filed: 03/12/2014
  • Issued: 12/15/2015
  • Est. Priority Date: 03/15/2013
  • Status: Active Grant
First Claim
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1. A method comprising:

  • operating a engine in a skip fire manner to deliver a desired engine output;

    identifying a time period during skip fire operation that is suitable for initiating or performing a selected engine diagnosis, wherein the selected engine diagnosis utilizes a sensor that is associated with a group of cylinders and the identified time period is one selected from the group consisting of (i) a time period in which a single first cylinder in the group of cylinders is fired a plurality of times in isolation relative to the sensor used in the diagnosis, and (ii) a time period in which no cylinder in a first bank of cylinders associated with the sensor used in the diagnosis is fired over the course of at least one engine cycle while at least one other cylinder not associated with the first bank of cylinder is fired; and

    conducting or initiating the selected engine diagnosis during the identified time period while the engine is operated in a skip fire manner to deliver the desired engine output.

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