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Engine error detection system

  • US 10,088,388 B2
  • Filed: 09/11/2017
  • Issued: 10/02/2018
  • Est. Priority Date: 10/16/2014
  • Status: Active Grant
First Claim
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1. A method for detecting misfire in an engine, the engine having a plurality of working chambers and being operated in a skip fire manner, the method comprising:

  • assigning a window to a target firing opportunity;

    attempting to fire a target working chamber during the target firing opportunity;

    measuring a change in an engine parameter during the target firing opportunity;

    using a multi-cylinder pressure model to help determine an expected change in the engine parameter during the target firing opportunity wherein the pressure model involves estimating pressure in a skipped working chamber, wherein the determination of the expected change in the engine parameter accounts for torque added or subtracted from the powertrain by an auxiliary power source;

    based on a comparison between the expected change and the measured change, determining whether the target working chamber misfired.

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