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CYLINDER HEAD ACCELERATION MEASUREMENT FOR VALVE TRAIN DIAGNOSTICS SYSTEM AND METHOD

  • US 20160370254A1
  • Filed: 06/22/2015
  • Published: 12/22/2016
  • Est. Priority Date: 06/22/2015
  • Status: Active Grant
First Claim
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1. A system comprising:

  • an engine control system configured to control an engine, wherein the engine control system comprises a processor configured to;

    receive a vibration signal sensed by a knock sensor disposed in an engine;

    receive a crankshaft signal sensed by a crank angle sensor disposed in the engine, wherein the crankshaft signal is representative of an engine crank angle; and

    monitor a valve timing by deriving a cylinder head acceleration measurement via the vibration signal received by the knock sensor, wherein the processor is configured to monitor the valve timing by deriving a valve lash based on the vibration signal, the engine crank angle, and a threshold valve lash model.

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