×

Misfire detection apparatus for internal combustion engine

  • US 7,607,345 B2
  • Filed: 04/19/2006
  • Issued: 10/27/2009
  • Est. Priority Date: 04/20/2005
  • Status: Expired due to Fees
First Claim
Patent Images

1. A misfire detection apparatus for an internal combustion engine that detects a misfire in the internal combustion engine provided with a flywheel damper based on a rotation fluctuation of the engine, whereinan operation range where misfire detection is affected by said flywheel damper is set in advance, the misfire detection apparatus for the internal combustion engine comprises:

  • a determination portion determining whether or not an operation state of said internal combustion engine is within the operation range affected by said flywheel damper;

    a detection control portion restricting misfire detection, when the operation state of said internal combustion engine is within the operation range affected by said flywheel damper; and

    a total misfire counter and a cylinder-by-cylinder misfire counter, whereina count value of said total misfire counter and a count value of said cylinder-by-cylinder misfire counter are both updated, when the operation state of said internal combustion engine is outside the operation range affected by said flywheel damper, andonly the count value of said total misfire counter is updated, when the operation state of said internal combustion engine is within the operation range affected by said flywheel damper.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×