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Knocking state determination device

  • US 7,669,582 B2
  • Filed: 06/02/2008
  • Issued: 03/02/2010
  • Est. Priority Date: 06/28/2005
  • Status: Expired due to Fees
First Claim
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1. A knocking state determination device in an internal combustion engine, comprising:

  • a first detecting portion for detecting a waveform of vibration caused in said internal combustion engine at a predetermined interval for a crank angle;

    a memory portion for previously storing a waveform of vibration of said internal combustion engine;

    a second detecting portion for detecting magnitude values relating to magnitude of vibration caused in said internal combustion engine in a plurality of ignition cycles;

    an extracting portion for extracting a magnitude value satisfying a predetermined condition among said plurality of magnitude values based on a result of comparing said detected waveform with said stored waveform;

    a determining portion for determining a knocking occurrence state based on said magnitude value extracted;

    a knock magnitude calculating portion for calculating a knock magnitude relating to a magnitude of vibration caused by knocking, based on the result of comparing said stored waveform and the detected waveform and a magnitude of vibration caused in said internal combustion engine at said predetermined interval for the crank angle;

    a knocking determining portion for determining whether knocking has occurred in said internal combustion engine for each ignition cycle based on a result of comparing said knock magnitude and a predetermined determination value; and

    a correcting portion for correcting said predetermined determination value based on a determination result by said determining portion.

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