Patents Assigned to Lotus Engineering, Inc.
  • Engine misfire detection
    Patent number: 7292933
    Abstract: A method of detecting an engine malfunction such as a misfire includes determining engine speed values at each of a plurality of measurement angular positions, heterodyning the engine speed values with sine and cosine functions indexed in the angular domain, passing the heterodyned results through a low pass filter, and computing the resulting magnitude from the resulting two vectors. An apparatus for detecting an engine malfunction, such as a misfire, includes an engine speed analyzer, a multiplier, and a low pass filter.
    Type: Grant
    Filed: November 1, 2005
    Date of Patent: November 6, 2007
    Assignee: Lotus Engineering, Inc.
    Inventor: James R. Christensen