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Induction diagnostics for skip fire engines

  • US 9,891,137 B2
  • Filed: 07/03/2017
  • Issued: 02/13/2018
  • Est. Priority Date: 10/23/2014
  • Status: Active Grant
First Claim
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1. A method of detecting an induction fault of a cylinder in an internal combustion engine having a crankshaft, the method comprising:

  • measuring the angular acceleration of the crankshaft to generate a crankshaft acceleration signal;

    comparing the crankshaft angular acceleration signal with a reference angular acceleration wherein the reference is based at least in part on a commanded skip/fire decision; and

    generating a fault signal when an induction fault is detected, wherein the induction fault detection is based at least in part on a determination that the crankshaft angular acceleration signal has deviated from the reference angular acceleration by at least a prescribed threshold.

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