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Engine rotation information detection device

  • US 20050120782A1
  • Filed: 12/07/2004
  • Published: 06/09/2005
  • Est. Priority Date: 12/08/2003
  • Status: Active Grant
First Claim
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1. An engine rotation information detection device that detects rotation information including information on a reference crank angle position of an engine comprising:

  • signal generating device including a rotor in which one of n reluctors (n is an integer equal to or more than three) arranged at regular intervals in a rotational direction of a crankshaft of said engine is missed, a total of n-1 reluctors are arranged in said rotational direction, and a portion from which said one reluctor is missed is a reluctor missing portion, and a pulse signal generator that detects an edge of each of the n-1 reluctors provided on said rotor to generate a pulse, said pulse signal generator detecting an edge of any reluctor of said rotor to generate a pulse when a crank angle position of said engine matches said reference crank angle position;

    a generator that rotates in synchronization with said crankshaft to output an n×

    m-cycle AC voltage (m is an integer equal to or more than one);

    counting means that counts the number of detections of a singular point of a waveform of said AC voltage in each detection section, said detection section being a section between a crank angle position where said pulse signal generator detects the edge of each reluctor to generate a pulse and a crank angle position where said pulse signal generator detects a next reluctor to generate a pulse; and

    reference crank angle position identification means that uses a difference between a count value counted by said counting means in a detection section including said reluctor missing portion and a count value counted by said counting means in other detection sections to specify the detection section including the reluctor missing portion and identify a pulse generated at said reference crank angle position based on the specified detection section.

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