Determining crankshaft acceleration in an internal combustion engine
Apparatus for detecting misfire in internal combustion engines for vehicles
Misfire detecting device for internal combustion engine
Method for detecting misfires in gasoline internal combustion engine
Single sensor misfire detection apparatus and method for an internal combustion engine
System and method to compensate for torsional disturbances in measured crankshaft velocities for engine misfire detection
Misfire detection method based on fluctuation in crankshaft rotation
Misfire detecting apparatus for internal combustion engine with manufacturing error compensation Patent #: 5528929
ApplicationNo. 704368 filed on 08/28/1996
US Classes:701/110, Speed, acceleration, deceleration73/116, MOTOR AND ENGINE TESTING73/117.3, With continuous operation123/406.24, Including means responsive to the instantaneous change in engine speed (e.g., roughness, unstable combustion, etc.)123/436Including means responsive to instantaneous change in engine speed
ExaminersPrimary: Dombroske, George M.
Attorney, Agent or Firm
Foreign Patent References
International ClassG01M 015/00
Foreign Application Priority Data1995-09-04 JP
AbstractIt is intended to detect combustion state of an internal combustion engine over the entire range where positive torque is generated. Time required from a predetermined first crank angle to a second crank angle is measured by detecting a rotation angle of a ring gear or plate with engine speed detecting means 101. Then, a combustion state parameter is calculated from said required time by combustion state detecting means 102 with an established calculation method, and combustion state is determined by combustion state judging means 103. Engine speed correction means 104 determines and feeds back a correction value for the combustion state detecting value to correct the engine speed. At the moment, the correction quantity for correcting the required time is varied so that the normal combustion value of said combustion state parameter is at a predetermined value or less, or within a predetermined range. When the combustion state parameter reaches a value indicating misfire, update of the correction value is inhibited for a prescribed duration before and after it.